Journal articles: 'Water-tube boilers'

1

Milton, J. T. "WATER-TUBE BOILERS." Journal of the American Society for Naval Engineers 6, no. 2 (March 18, 2009): 357–72. http://dx.doi.org/10.1111/j.1559-3584.1894.tb05838.x.

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Soliani, Nabor. "WATER TUBE BOILERS." Journal of the American Society for Naval Engineers 7, no. 1 (March 18, 2009): 97–130. http://dx.doi.org/10.1111/j.1559-3584.1895.tb01069.x.

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Scott, J. Alvah. "WATER-TUBE BOILERS." Journal of the American Society for Naval Engineers 10, no. 3 (March 18, 2009): 627–40. http://dx.doi.org/10.1111/j.1559-3584.1898.tb01897.x.

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Almy, Darwin. "WATER TUBE BOILERS." Journal of the American Society for Naval Engineers 10, no. 1 (March 18, 2009): 106–9. http://dx.doi.org/10.1111/j.1559-3584.1898.tb05767.x.

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Huang, Hui Lan, and Gang Li. "Analysis of the Performance for a Group-Annulus Type Oil-Fired Boiler." Advanced Materials Research 97-101 (March 2010): 2921–24. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.2921.

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To overcome the shortcomings of the traditional hot-water boilers, a oil-fired hot water boilers is improved design for a group-annulus structure. A finished product boiler is thermodynamic analyzed with the tested heat generation amount equivalent to 350 kW. The results indicate that the unique heat exchange structure of group-annulus type hot-water boilers can reduce thermal stresses and intensify convection heat exchange. The radiation heat-exchange space is 2 times more than that of the shell-tube boiler, and surfaces inside the furnace are comparatively large. Compared with shell-tube type boilers, the group-annulus type boilers is made a distinction with small volume and heat-exchange surface area, low metal consumption and high ratio of performance to cost under the same total heat-exchange quantity.

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Watkinson, W. H. "CIRCULATION IN WATER-TUBE BOILERS." Journal of the American Society for Naval Engineers 8, no. 3 (March 18, 2009): 489–500. http://dx.doi.org/10.1111/j.1559-3584.1896.tb00731.x.

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Tuński, Tomasz, Cezary Behrendt, and Marcin Szczepanek. "Mathematical Modeling of the Working Conditions of the Ship’s Utilization Boiler in Order to Evaluate Its Performance." Energies 12, no. 16 (August 13, 2019): 3105. http://dx.doi.org/10.3390/en12163105.

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The paper presents a mathematical model allowing the determination of the amount of saturated steam produced in marine water tube boilers and smoke tube boilers. The mathematical model includes the impact of the exhaust gas temperature and its amount, ambient temperature, engine power load, and location of boiler tubes. In addition to the amount of steam generated in a boiler, it is also feasible to establish flow resistance of the exhaust gas in the boiler determined by the boiler tubes’ arrangement and the thickness of scale deposits and the exhaust gas temperature after the exhaust gas boiler. Due to the model universality, it may be applied not only to make calculations for existing boilers, but also to perform numerical experiments in order to determine the amount of steam produced by the entire range of boilers used in the waste heat recovery systems in power marine systems and the adopted limit values, such as exhaust gas flow resistance and their temperature, after the boiler. The reliability of the obtained results has been revised by comparing them with the outcomes of the experiments performed on the ships.

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Kurepin, Maxim P., and Mikhail Yu Serbinovskiy. "Simulation and optimization of water-wall tube panels design for power boilers." MATEC Web of Conferences 298 (2019): 00112. http://dx.doi.org/10.1051/matecconf/201929800112.

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The article presents a water-wall tube panels simulation technique that uses finite element method as well as the power boiler water-wall structure design optimization method. Results of the proposed method verification and its application to the design of boilers of different capacities are discussed. The technique is to replace water-wall tube panels with equivalent plates. Replacement plates’ parameters calculation is reported, panels one-way heating metering is described. Optimization of the water-wall structure design is carried out in two stages: at the first stage, water-wall tube panels are replaced with orthotropic plates; at the second stage, sub-simulation with solid models is used to identify problem areas of the design. Solid-state models of the problem areas get connected to the orthotropic plates at calculated boundary conditions. The described approach improves accuracy of the simulation results and significantly reduces the models complexity and its computation time. The proposed simulation and optimization method has been tested and successfully applied to design power steam boilers with steam generating capacity of 500, 1030 and 1900 tons of steam per hour. As a result, while maintaining the specified reliability and durability, significant reduction of metal content in boiler structure is achieved.

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Taler, Jan, Dawid Taler, Tomasz Sobota, and Piotr Dzierwa. "New technique of the local heat flux measurement in combustion chambers of steam boilers." Archives of Thermodynamics 32, no. 3 (December 1, 2011): 103–16. http://dx.doi.org/10.2478/v10173-011-0016-2.

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New technique of the local heat flux measurement in combustion chambers of steam boilers A new method for measurement of local heat flux to water-walls of steam boilers was developed. A flux meter tube was made from an eccentric tube of short length to which two longitudinal fins were attached. These two fins prevent the boiler setting from heating by a thermal radiation from the combustion chamber. The fins are not welded to the adjacent water-wall tubes, so that the temperature distribution in the heat flux meter is not influenced by neighbouring water-wall tubes. The thickness of the heat flux tube wall is larger on the fireside to obtain a greater distance between the thermocouples located inside the wall which increases the accuracy of heat flux determination. Based on the temperature measurements at selected points inside the heat flux meter, the heat flux absorbed by the water-wall, heat transfer coefficient on the inner tube surface and temperature of the water-steam mixture was determined.

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Nie, Li Jun, Yang Liu, and Mei Huang. "The Design of Electrostatic Precipitation for the Home Heating Boiler with Fine Coal Water Slurry Combustion." Advanced Materials Research 726-731 (August 2013): 1972–76. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1972.

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The coal-water slurry produced with Datong coal was tested in a home boiler for heating. The experiment results of dust collection with the new tube type electrostatic precipitation of fly ash of coal water slurry combustion fit the emission standard of air pollutants for boilers (GB 13271-2001). The parameters for the electrostatic precipitation are as follows: the drift velocity of fly ash of coal water slurry combustion, 10.39 cm/s, the number of the tube, 64, the size of the tube, 25.6cm×25.6cm×20cm, the power, 0.24kW.

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11

Aguilar Vizcarra, Duilio, Doris Esenarro, and Ciro Rodriguez. "Three Steps Mixed (Fire Tube–Water Tube) Vertical Boiler to Optimize Thermal Performance." Fluids 6, no. 3 (February 25, 2021): 93. http://dx.doi.org/10.3390/fluids6030093.

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The research aims to design and construct a new mixed vertical boiler (fire tube – water tube) with three gas passes. The strength of this technological innovation is in the best use of the thermic transmission receiving fluid (hot water, steam, thermal oil), this due to its multipurpose function of three steps using alternative fuels (Diesel, Liquid Petroleum Gas LPG, natural gas), by improving the thermal efficiency of the boiler its temperature is reduced with gases at low temperatures, which in turn also reduce environmental pollution. The methodology focuses on calculating the transfer area with the calculation method that will allow dimensioning the boiler, considering the calculation of losses and the fluid speed, with two defined procedures, the first for fire tube and water tube boilers. And another alternative. The results obtained allowed optimizing the thermal efficiency level, achieving very significant thermal efficiency results: With LPG 92.4% for hot water and 92.42% to generate steam in the same way with natural gas 90.25% for hot water and 90.24% to generate steam as well with Diesel 2; 89.21% for hot water and 89.31% to generate steam.

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Taler, Jan, Dawid Taler, and Andrzej Kowal. "Measurements of absorbed heat flux and water-side heat transfer coefficient in water wall tubes." Archives of Thermodynamics 32, no. 1 (April 1, 2011): 77–88. http://dx.doi.org/10.2478/v10173-011-0004-6.

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Measurements of absorbed heat flux and water-side heat transfer coefficient in water wall tubes The tubular type instrument (flux tube) was developed to identify boundary conditions in water wall tubes of steam boilers. The meter is constructed from a short length of eccentric tube containing four thermocouples on the fire side below the inner and outer surfaces of the tube. The fifth thermocouple is located at the rear of the tube on the casing side of the water-wall tube. The boundary conditions on the outer and inner surfaces of the water flux-tube are determined based on temperature measurements at the interior locations. Four K-type sheathed thermocouples of 1 mm in diameter, are inserted into holes, which are parallel to the tube axis. The non-linear least squares problem is solved numerically using the Levenberg-Marquardt method. The heat transfer conditions in adjacent boiler tubes have no impact on the temperature distribution in the flux tubes.

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13

Levai, Ing Julius. "DAMAGES TO THE TUBES OF SMALL-TUBE WATER-TUBE BOILERS." Journal of the American Society for Naval Engineers 39, no. 1 (March 18, 2009): 39–51. http://dx.doi.org/10.1111/j.1559-3584.1927.tb04974.x.

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14

Karno, Karno, and Achmad Kusairi Samlawi. "PENGARUH UKURAN PASIR TERHADAP KINERJA BOILER UNIT 1 PLTU PULANG PISAU." Scientific Journal of Mechanical Engineering Kinematika 4, no. 2 (December 16, 2019): 53–66. http://dx.doi.org/10.20527/sjmekinematika.v4i2.117.

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The use of sand in the cfb boiler function as a coal burner which enters the combustion chamber. Sand in the combustion chamber is lined up and coal enters the combustion chamber. With the entry of coal into the furnace fluidization occurs, where the heat in the sand burns coal that hovers, so that the heat that arises is used to heat the water in the boiler tubes. The remaining coal combustion (ash) wil float/fly inhaled by IDF air. Sand movement is expeted to only always bubbling up ang down in the furnace area only so that complete combustion occurs and the boiler is reliable. Because the bubbling is influenced by air pressure, coal quality, which can cause friction between material (sand and coal) and refractory giving rise to abrasives on refractory. If refractory is abrasive it can cause abrasive on the tube water wall boilers, tube cyclones so that boiler performance will decrease.The use of sand that is not clear is one of the causes of refractory damage in cfb type boilers. So that the cfb boiler remains reliable, the use of sand must be in accordance with the type and size according to the particular boiler.

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15

Rajic, Milena, Dragoljub Zivkovic, Milan Banic, Marko Mancic, Tasko Maneski, Milos Milosevic, and Nenad Mitrovic. "Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate." Thermal Science, no. 00 (2021): 207. http://dx.doi.org/10.2298/tsci210313207r.

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Boilers are one of the most used units for both heat generation plants and industry systems. Their operation is subjected to different working loads and maintenance requirements. Exploitation experience points out critical boiler zones where failures and break downs typically occur. This paper analyzes critical zones in hot water fire-tube boiler. Experimental procedure was performed on the model of this type of boilers and its critical element. The tube plate of hot water boiler was identified as the most critical one. Experimental analysis and numerical model verification were performed using Aramis system based on 3D Digital Image Correlation method. Numerical analysis was done in Ansys Software Package and verification of results was done based on measurements obtained by strain gauges and local measurements performed by the Aramis system. Stress-strain analysis indicates the critical zones of boiler tube plate. The character of change parameters such as strain and stress occurring in the critical zones can be verified both by experimental and numerical data. The paper presents a novel approach in experimental and numerical analyses that can be conducted in similar units and used for existing unit optimization, as well as for new product testing on different loads and provide opportunity for further development and improvement for practical industrial application.

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16

Zhao, Bin, Jun Hao Li, Jing Quan Shen, and Guo Zhong Wang. "The Analysis on Circulating Fluidized Bed Boiler Heat Tube Failure." Advanced Materials Research 291-294 (July 2011): 1679–84. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1679.

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Boiler heat tube failure is a long-term technical problem plaguing the production of electricity. The research on how to prevent failure of boiler heat tubes has practical significance. In this paper, select the type of the Tangshan Dong fang power plant SG-490/13.8-M572 CFB boiler as the research object, part by pressure, failure type, and run-time statistics on the heat tubes failure of two boilers throught the collation and analysis on records, the basic rules of the failure are found out, statistics show that the water wall and super heater tubes explosion causes boiler shutdown time accounted for unplanned boiler shutdown time about 82%, small power generating capacity of about 11% of the total time. Finally, relevant technical strategies including improving maintenance quality and strengthening boilers regular inspection are proposed, the unplanned outage of units is radically reduced, and the safety and reliability of boiler operation is comprehensively improved.

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17

Kanygin, A. V. "WATERTUBE SMOKE TUBE BOILER: NUMERICAL COMPUTER SIMULATION AND EXPERIMENT." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 61, no. 3 (May 28, 2018): 269–82. http://dx.doi.org/10.21122/1029-7448-2019-61-3-269-282.

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The improvement of natural gas use technologies in water-heating boilers is considered. The concept of a new watertube smoke tube boiler, created on the basis of the screen radial tube bundle placement in the space of a cylindrical heat pipe-furnace. The results of numerical computer simulation of the furnace process in the 630 kW watertube smoke tube boiler are compared with the corresponding data obtained during the experiment. The analysis of the results of numerical computer simulation reveals the efficiency of the installed tube radial bundle: the total heat perception in the furnace increased by 56 %, while the growth of the part of the heat transferred by convective heat exchange occurred by 22 %; the temperature level in the furnace volume has decreased, while the concentration of nitrogen oxides has decreased by 45–51 %. It is experimentally established that the presence of the cooled screen tube radial bundle in the furnace of the watertube smoke tube boiler makes it possible: to increase heat release rate in the furnace volume by 10 %; to reduce the concentration of nitrogen oxides and carbon monoxide in flue gases by 24–40 % and 25–67 % respectively (resulting in a compliance of the level of pollutant emission to the requirements of the Ukrainian national regulations, viz. GOST 30735–2001); reduce the excess air in the furnace by 3 % and increase the efficiency of the boiler by 0.5 %. The pre-production prototype of the water-heating smoke tube boiler (KVVD-0.63 Gn) has passed the certification tests, state registration; the boiler has been adopted in permanent operation. The boiler is not complicated in manufacturing, and producible in the conditions of municipal heating network companies. The reliability of the boiler's design has been confirmed by the experience of many years of functioning.

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18

Ainun, Finus, and Jamaaluddin Jamaaluddin. "Analisa Eisiensi Economizer Terhadap Boiler (Gas Dan Solar) Di PT. Spindo III, Tbk." JEEE-U (Journal of Electrical and Electronic Engineering-UMSIDA) 2, no. 2 (November 27, 2018): 99. http://dx.doi.org/10.21070/jeee-u.v2i2.1697.

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The role of boiler machines at PT. SPINDO in the galvanize pipe production process is very important, where the steam produced by the fire tube boiler machine is directly distributed into the blow system for the cleaning of the remaining galvanic in the pipe and heating the water for pipe washing. To determine the efficiency of the boiler, a direct method is used to analyze the efficiency of boiler machines and indirect methods as a way of calculating the amount of efficiency if an economizer is installed. The efficiency of diesel-fueled boilers using the direct method yields an average yield of 40.7% (forty point seven percent) and 45.84% (forty five point eighty four percent) for gas-fired boilers. However, by using an indirect method, efficiency if installed economizer is obtained at 85.55% (eighty five point fifty five percent) for diesel-fueled boilers with a capacity of 5 tons and 81.76% (eighty one point seventy six percent) of the efficiency of a gas-fired boiler with a capacity of 2 (two) tons. Efficiency improvements can also be done in many ways, including maintenance of a good and scheduled boiler machine for good boiler feed water treatment.

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Huang, B. J., R. H. Yen, and W. S. Shyu. "A Steady-State Thermal Performance Model of Fire-Tube Shell Boilers." Journal of Engineering for Gas Turbines and Power 110, no. 2 (April 1, 1988): 173–79. http://dx.doi.org/10.1115/1.3240098.

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A nonlinear steady-state thermal performance model of a fire-tube shell boiler was developed in the present study. The model consists of two semi-empirical equations for the radiative heat flux from the combustion gas to the boiling water and the heat loss flux from the body surface to the ambient. Using this model, we can simulate the boiler performance under standard conditions and draw standard performance curves from which the thermal performance comparison between different boilers can be made on a common basis.

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20

Robison, J. K. "WATER-TUBE BOILERS A NECESSITY.-A WAR LESSON." Journal of the American Society for Naval Engineers 10, no. 4 (March 18, 2009): 996–1008. http://dx.doi.org/10.1111/j.1559-3584.1898.tb01921.x.

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21

Ymtow, Hmm E. "HIGH-PRESSURE WATER-TUBE BOILERS FOR MARINE PURPOSES*." Journal of the American Society for Naval Engineers 38, no. 2 (March 18, 2009): 362–468. http://dx.doi.org/10.1111/j.1559-3584.1926.tb05551.x.

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22

Yarrow, A. F. "NOVEL ARRANGEMENT OF FEED-WATER HEATER IN WATER-TUBE BOILERS." Journal of the American Society for Naval Engineers 10, no. 2 (March 18, 2009): 409–21. http://dx.doi.org/10.1111/j.1559-3584.1898.tb01882.x.

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23

Thasanaraphan, Pornsak, Pannawat Thapnuy, Duangporn Ounpanich, and Pratip Vongbandit. "Remaining Creep Life Assessment of Service Superheat Tube Boiler." Key Engineering Materials 659 (August 2015): 686–90. http://dx.doi.org/10.4028/www.scientific.net/kem.659.686.

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The demand of remaining life assessment of the boilers arises from technical, economic, and legal reasons. Creep is major damage mechanism of primary superheat tube boiler during prolong operation at high temperature and pressure in a water tube boiler. This paper presents the calculation method for the remaining life assessment due to creep damage. The service-exposed primary superheat tube made of 2.25Cr-1Mo steels. During scheduled inspection, wall thickness measurement, metallographic investigation by replica technique, design data and operating condition were used to estimate the remaining life in the form of creep damage accumulation rate calculated from life fraction using Larson-Miller Parameter. The results indicate that the primary superheat tubes satisfy in extension service life. By attaining an accurate and timely discussion of the results, the engineer can manage the maintenance and inspection schedule for the critical part in the boiler.

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24

Kang, Seongmin, Seonghum Cho, Joonyoung Roh, and Eui-chan Jeon. "Analysis of Main Factors for CH4 Emission Factor Development in Manufacturing Industries and Construction Sector." Energies 13, no. 5 (March 6, 2020): 1220. http://dx.doi.org/10.3390/en13051220.

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This study has statistically analyzed the effect of boiler type and model year on CH4 emission factors, focusing on liquefied natural gas (LNG)—the most commonly used fuel in South Korean manufacturing combustion facilities. Samples were collected from the boilers of 39 manufacturing combustion facilities that use LNG fuel. The CH4 emission factors were developed based on 4 overhead fire-tube boilers, 14 once-through boilers, 14 vertical boilers with vertical water tubes, and 7 other boilers. This resulted in an average value of 0.11 CH4 kg/TJ, which is considerably lower than the Intergovernmental Panel on Climate Change (IPCC) 1996 guidelines(G/L) emission factor of 5 CH4 kg/TJ currently used in South Korea. In the Kruskal–Wallis test results, the significance probability was greater than 0.05 for the boiler types and ages, and there was no major difference in the average distributions, according to the boiler type or age. Therefore, according to the results of this study, the differences in the CH4 emission factors according to the boiler types and ages are not statistically large, and it was determined that there is no major difference even when the emission factors are applied to different fuel types. However, there was a major difference when the developed factors were compared to the CH4 emission factor proposed by the IPCC. Thus, there is a need to develop manufacturing combustion CH4 emission factors that reflect national characteristics.

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25

Seaton, Albert Edward. "USE OF WATER TUBE BOILERS IN THE MERCANTILE MARINE." Journal of the American Society for Naval Engineers 9, no. 4 (March 18, 2009): 667–77. http://dx.doi.org/10.1111/j.1559-3584.1897.tb00295.x.

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Speakman, E. M. "THE WIDER ADOPTION AND STANDARDIZATION OF WATER-TUBE BOILERS*." Journal of the American Society for Naval Engineers 24, no. 2 (March 18, 2009): 692–717. http://dx.doi.org/10.1111/j.1559-3584.1912.tb03563.x.

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27

Emara-Shabaik, H. E., M. A. Habib, and I. Al-Zaharna. "Prediction of risers’ tubes temperature in water tube boilers." Applied Mathematical Modelling 33, no. 3 (March 2009): 1323–36. http://dx.doi.org/10.1016/j.apm.2008.01.015.

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Junkhan, G. H., A. E. Bergles, V. Nirmalan, and T. Ravigururajan. "Investigation of Turbulators for Fire Tube Boilers." Journal of Heat Transfer 107, no. 2 (May 1, 1985): 354–60. http://dx.doi.org/10.1115/1.3247422.

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This paper summarizes an experimental study of three popular “turbulator” inserts for fire tube boilers. An electrically heated flow facility was developed to deliver hot air to a water-cooled steel tube instrumented to derive sectional average heat transfer coefficients for four regions of the tube. Reference data for the empty tube are in excellent agreement with the accepted correlation. Two commercial turbulators, consisting of narrow, thin metal strips bent and twisted in zig-zag fashion to allow periodic contact with the tube wall, displayed 135 and 175 percent increases in heat transfer coefficient at a Reynolds number of 10,000. A third commercial turbulator, consisting of a twisted strip with width slightly less than tube diameter, provided a 65 percent increase in heat transfer coefficient. The friction factor increases accompanying these heat transfer coefficient increases were 1110, 1000, and 160 percent, respectively, for the same Reynolds number. These data should be useful in assessing overall performance gains to be expected when turbulators are used in actual boilers.

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Pang, Liping, Size Yi, Liqiang Duan, Wenxue Li, and Yongping Yang. "Thermal Stress and Cyclic Stress Analysis of a Vertical Water-Cooled Wall at a Utility Boiler under Flexible Operation." Energies 12, no. 6 (March 26, 2019): 1170. http://dx.doi.org/10.3390/en12061170.

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Supercritical once-through utility boilers are increasingly common in flexible operations in China. In this study, the tube temperature changes at a vertical water-cooled wall are analyzed during a fluctuating flexible operation. There are considerable differences in the temperatures of the parallel tubes at the minimum load, and the resulting thermal stress distributions at a front water-cooled wall are established using structural calculation software ANSYS 17.1, USA. A wide thermal stress distribution occurs among the parallel tubes, and the local cyclic stress amplitudes under flexible operation are higher than those under cold, warm, hot, or load-following operations. Because of the water wall expansion structure at the furnace, the higher tube temperature areas suffer from compressive stress, while the lower tube temperature areas suffer from tensile stress. During flexible operation, combustion uniformity and a two-phase flow distribution can improve the safety of vertical water-cooled wall operation. The minimum load of the utility boiler should be set as a limitation, and the tube temperature is an important parameter affecting the thermal and cyclic stresses.

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NAKAHARAI, Hiroyuki, Yuta WATANABE, Yuichi KANEMAKI, Kazuhiro DOMOTO, Yoshinori YAMASAKI, Hiroshi SUGANUMA, and Kenjiro YAMAMOTO. "Development of Enhanced Rifled Tube for Vertical Water Wall Boilers." Proceedings of the National Symposium on Power and Energy Systems 2019.24 (2019): D143. http://dx.doi.org/10.1299/jsmepes.2019.24.d143.

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Habib, M. A., H. E. Emara-Shabaik, I. Al-Zaharnah, and T. Ayinde. "A thermal nonlinear dynamic model for water tube drum boilers." International Journal of Energy Research 34, no. 1 (April 20, 2009): 20–35. http://dx.doi.org/10.1002/er.1548.

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Zeinda, Eliza Marceliana, and Sho’im Hidayat. "RISK ASSESSMENT KECELAKAAN KERJA PADA PENGOPERASIAN BOILER DI PT. INDONESIA POWER UNIT PEMBANGKITAN SEMARANG." Indonesian Journal of Occupational Safety and Health 5, no. 2 (May 5, 2017): 183. http://dx.doi.org/10.20473/ijosh.v5i2.2016.183-191.

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Boiler is a tool produced steam. The operation of boiler produce hazard that can cause accidents in labor. The purpose of this research is to risk assessment for accidents work in the operation of boilers in PT. Indonesia Power Unit Pembangkitan Semarang. This research is observational. The object of this research is boiler. The subject of this research is coordinator and operator boiler. The primary data was obtained from observation and interview, while secondary data from the corporate documents. The result showed that boilers in PT. Indonesia Power Unit Pembangkitan Semarang were 3 unit of water tube using fuel MFO and HSD. The identification hazard obtained 12 findings hazard on 9 areas the operation boiler PT. Indonesia Power unit Pembangkitan Semarang. The hazard in the area of boiler are noise, hot weather, fire sparks, hit, pinched hand, discover water vapor, high pressure, electricity, contact with a steam pipe, amount of oil, exposed NaOH liquid, and slip and fall down from the height. On controlling value, there were 6 hazards that classified as in very good control, 3 hazards were classified as partly implemented, and 3 hazards were classified as implemented. The residual risk was obtained 5 category risk with no risk and 7 risk categories low. Conclusion that can be drawn are hazard boiler in PT. Indonesia Power Unit Pembangkitan Semarang have high risk of are hazard discover water vapor and the high pressure. The company suggested to perform maintenance and reduce the risk to a low.Keywords: risk assessment, work accidents, boiler

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Jurkiewicz, Rafał, and Jacek Słania. "Application of Heads with the Water Coupling for Measuring Thicknesses of Tubes Used in Coal-Fuelled Power Engineering Systems Part 1. Primary Issues." Biuletyn Instytutu Spawalnictwa, no. 1 (February 2021): 33–41. http://dx.doi.org/10.17729/ebis.2021.1/3.

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The first part of the article presents basic information concerning measurements of corrosion thickness measurements (mapping) in respect of issues accompanying the combustion of biomass in currently operated power boilers. The article emphasises issues related to the degradation of the surface of waterwall tubes and stresses the necessity of applying a technique enabling the performance of reliable measurements through the destroyed surface of the boiler tube. The article also presents issues possibilities of using Spot weld types of transducers and the water column as a method enabling the non-contact of the rube surface.

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Yarrow, A. F. "SOME EXPERIMENTS HAVING REFERENCE TO THE DURABILITY OF WATER-TUBE BOILERS.*." Journal of the American Society for Naval Engineers 11, no. 3 (March 18, 2009): 633–40. http://dx.doi.org/10.1111/j.1559-3584.1899.tb01259.x.

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Sosa-Arnao, Juan H., and Sílvia A. Nebra. "Bagasse Dryer Role in the Energy Recovery of Water Tube Boilers." Drying Technology 27, no. 4 (March 25, 2009): 587–94. http://dx.doi.org/10.1080/07373930802716326.

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36

Elshafei, Moustafa, and Mohamed A. Habib. "Softsensor for estimation of steam quality in riser tubes of boilers." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 10 (December 14, 2012): 2337–47. http://dx.doi.org/10.1177/0954406212471256.

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Steam fraction in riser tubes of boilers is a critical process variable which impacts the life of the tubes and could lead to tube rupture, long boiler down time, and expensive repairs. Unfortunately this parameter is difficult to measure by hardware sensors. This article presents a new neural network softsensor for estimation and monitoring steam mass and volume fractions in riser tubes. First, conventional data were collected from a target industrial boiler. The data are then used to develop a detailed nonlinear simulation model for the two phase flow in the riser tubes and risers and downcomers water circulation. The model output is verified against the collected field data. Next, the boiler nonlinear model is used to generate data covering a wide rage of operating conditions for training and testing the neural network. The input of the neural network includes the heating power, the steam flow rate, the water feed rate, the drum level, and the drum pressure. The neural networks predict the mass steam quality and the steam volume fractions. The softsensor achieves a root mean square error on the test data less than 1.5%. The predicted steam quality is then compared with the critical limits to guide the operators for safe and healthy operation of the boilers. The developed softsensor for estimation of the steam quality has simple structure and can be implemented easily at the operator stations or the application servers.

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Wang, Zi Fang, Ye Bin Yin, Wei Ji, Yan Meng, Lian Sheng Liu, Jin Xiang Wu, En Yu Wang, and Xiang Gou. "Numerical Simulation Research on the Internal Flow of a Heat Exchanger." Applied Mechanics and Materials 694 (November 2014): 200–204. http://dx.doi.org/10.4028/www.scientific.net/amm.694.200.

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Spiral tube exchanger is one of the most important heat transfer devices among the electric water boilers. In this paper, CFD software is introduced to simulate the process of the flow of the spiral tube exchanger. Cases with different inlet velocities of the cold water have been conducted and results show that, temperature increment of the cold water reaches 38.87 K, 20.21 K and 12.12 K with the inlet velocity of the cold water set as 0.05 m/s, 0.09 m/s and 0.13 m/s respectively.

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Sun, Li, Junyi Dong, Donghai Li, and Yuqiong Zhang. "Model-Based Water Wall Fault Detection and Diagnosis of FBC Boiler Using Strong Tracking Filter." Mathematical Problems in Engineering 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/504086.

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Fluidized bed combustion (FBC) boilers have received increasing attention in recent decades. The erosion issue on the water wall is one of the most common and serious faults for FBC boilers. Unlike direct measurement of tube thickness used by ultrasonic methods, the wastage of water wall is reconsidered equally as the variation of the overall heat transfer coefficient in the furnace. In this paper, a model-based approach is presented to estimate internal states and heat transfer coefficient dually from the noisy measurable outputs. The estimated parameter is compared with the normal value. Then the modified Bayesian algorithm is adopted for fault detection and diagnosis (FDD). The simulation results demonstrate that the approach is feasible and effective.

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Jadeja, Nishadevi N. "Review Paper on Different Losses and Efficiency for Combined Type Water Tube and Fire Tube Industrial Boilers." International Journal for Research in Applied Science and Engineering Technology V, no. VIII (August 30, 2017): 1440–42. http://dx.doi.org/10.22214/ijraset.2017.8204.

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Gajic, Anto, Milorad Tomic, Ljubica Pavlovic, and Miomir Pavlovic. "The effect of water quality on reliability of boiler plants performance." Chemical Industry 64, no. 4 (2010): 311–17. http://dx.doi.org/10.2298/hemind100316018g.

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This paper presents sources and types of corrosion processes of boiler tube system of the Thermal Power Plant "Ugljevik". The main goal in the electric power production is to achieve lower prices, which can only be done by providing low maintenance costs. While it is not possible to completely stop corrosion, it could be slowed down and it's effects could be reduced. In order to reduce corrosion to a minimum on thermal power plants' vital equipment, particularly boilers, it is necessary to determine in each particular case the acting mechanism of corrosion and agents that cause it. Damages and failures on thermal power plants are largely caused by the development of various types of corrosion processes. Special attention is given to the preparation of water, considering its importance to the occurrence of corrosion. The following types of corrosion were detected on the screen tube boiler by visual examination on the side of water and steam: erosive, pitting and impact corrosion. The inner surface of screen pipes, from which the scale layer was removed, indicates that the erosive corrosion with the thinning of pipe walls occurs. Perforation of the welded screen pipes shows that stress corrosion occurred on the screen pipe with formation of cracks and that pipe exploded. Pits on the inner surface of the screen pipes, visible after the removal of scale and corrosion products, are proof that pitting corrosion occurred. The causes of corrosion were discovered and proposed measures for their elimination were given.

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Sharma, Kapil Dev, and Shobhit Srivastava. "Failure Mode and Effect Analysis (FMEA) for Enhancing Reliability of Water Tube Boiler in Thermal Power Plant." SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology 8, no. 02 (December 25, 2016): 79–86. http://dx.doi.org/10.18090/samriddhi.v8i2.7139.

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Failure mode and effect analysis is one of the QS-9000 quality system requirement supplements, with a wide applicability in all industrial fields. FMEA is the inductive failure analysis instruments which can be defined as a methodical group of activities intended to recognize and evaluate the potential failure modes of a product/ process and its effects with an aim to identify actions which could eliminate or reduce the chance of the potential failure before the problem occur. The purpose of this paper is to evaluate the FMEA research and application in the Thermal Power Plant Industry. The research will highlight the application of FMEA method to water tubes (WT) in boilers with an aim to find-out all the major and primary causes of boiler failure and reduce the breakdown for continuous power generation in the plant. Failure Mode and Effect Analysis technique is applied on most critical or serious parts (components) of the plant which having highest Risk Priority Number (RPN). Comparison is made between the quantitative results of FMEA and reliability field data from real tube systems. These results are discussed to establish relationships which are useful for future water tube designs.

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Milton, J. T. "ON THE PRESENT POSITION OF WATER-TUBE BOILERS AS APPLIED FOR MARINE PURPOSES." Journal of the American Society for Naval Engineers 5, no. 4 (March 18, 2009): 931–59. http://dx.doi.org/10.1111/j.1559-3584.1893.tb00992.x.

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Howden, James. "ON THE COMPARATIVE MERITS OF CYLINDRICAL AND WATER-TUBE BOILERS FOR OCEAN STEAMSHIPS." Journal of the American Society for Naval Engineers 6, no. 2 (March 18, 2009): 373–413. http://dx.doi.org/10.1111/j.1559-3584.1894.tb05839.x.

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Habib, M. A., R. Ben-Mansour, H. M. Badr, S. F. Ahmed, and A. F. Ghoniem. "Computational fluid dynamic simulation of oxyfuel combustion in gas-fired water tube boilers." Computers & Fluids 56 (March 2012): 152–65. http://dx.doi.org/10.1016/j.compfluid.2011.12.009.

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Li, Zhi Gang, Jin Li Chen, and Jing Ji Li. "Application of the Wind-Water Combined Slag Coolers in CFB Boilers." Advanced Materials Research 516-517 (May 2012): 568–71. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.568.

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At present, there have been a lot of accidents happened in the wind-water combined slag coolers of the Circulating Fluidized Bed (CFB) boiler power plants, which usually caused the low-load or even stop of the units along with great financial losses. Comprehensively considering the actual conditions of the domestic CFB boiler power plants, the theoretical analysis and thermodynamic calculation were conducted aiming to solve the specific problems found in the operation. There were new designs and retrofitting measures in the integral structure and some key components, such as the slag inlet-tube. The operation effect of the slag coolers, i.e. the stability and heat-recovery efficiency etc., were significantly improved by retrofitting the devices.

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Du, Hao Yang, Xue Hai Sun, Yi Mu Li, and Zhen An Ren. "Analysis on Waterfall Tube Corrosion and Strength Calculation for Boilers Exceeding Service Life." Advanced Materials Research 900 (February 2014): 695–98. http://dx.doi.org/10.4028/www.scientific.net/amr.900.695.

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Former USSR manufactured ΤΠ-230-2 type coal burning boiler has serviced for more than 369000 hours. The water fall tube burst caused by corrosion. The following examinations have been carried out , including macro-examination, metallographic analysis, tensile tests, inner and outer wall corrosion products and insulation materials analysis. Strength and remained thickness has also been calculated. Suggestions have been proposed to prevent similar explosions.

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Stecco, S. S., and U. Desideri. "Considerations on the Design Principles for a Binary Mixture Heat Recovery Boiler." Journal of Engineering for Gas Turbines and Power 114, no. 4 (October 1, 1992): 701–6. http://dx.doi.org/10.1115/1.2906645.

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The use of a binary mixture as a working fluid in bottoming cycles has in recent years been recognized as a means of improving combined cycle efficiency. There is, however, quite a number of studies dealing with components of plants that employ fluids other than water, and particularly binary mixtures. Due to different specific volume, viscosity, thermal conductivity, and Prandtl number, heat recovery boilers designed to work with water require certain modifications before they can be used with binary mixtures. Since a binary mixture is able to recover more heat from the exhaust fumes than water, the temperature difference between the hot and the cold fluids is generally lower over the whole recovery boiler; this necessitates greater care in sizing the tube bundles in order to avoid an excessive heat transfer surface per unit of thermal power exchanged. The aim of this paper is to provide some general criteria for the design of a heat recovery boiler for a binary mixture, by showing the influence of various dimensional parameters on the heat surface and pressure drop both in the cold and the hot side. Heat transfer coefficients and pressure drops in the hot side were computed by means of correlations found in the literature. A particular application was studied for an ammonia-water mixture, used in the Kalina cycles, which represents one of the most interesting binary cycles proposed so far.

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Roslyakov, Pavel V., Yury V. Proskurin, and Vitaly A. Kozhevnikov. "Simulation of the oil burning process with the admixture of bottom water in fire-tube boilers." SCIENCE & TECHNOLOGIES: OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION 7, no. 2 (April 30, 2017): 94–101. http://dx.doi.org/10.28999/2541-9595-2017-7-2-94-101.

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HOBBS, L. M. "SOME RECENT MODIFICATIONS TO WATER-TUBE BOILERS OF THE THREE-DRUM TYPE FITTED IN H.M., NAVY*." Journal of the American Society for Naval Engineers 38, no. 2 (March 18, 2009): 369–75. http://dx.doi.org/10.1111/j.1559-3584.1926.tb05552.x.

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ORUMBAYEV, Rakhimzhan K., Andrey A. KIBARIN, Balzhan T. BAKHTIYAR, Arman S. KASSIMOV, and Maxim S. KOROBKOV. "RESEARCH OF COMBUSTION MODES DURING LAYER-BURNING OF SHUBARKUL COAL ON THE FIRE GRATE WITH THE HAND FURNACE OF THE KSVR-0.43 HOT WATER BOILER." Periódico Tchê Química 17, no. 36 (December 20, 2020): 856–70. http://dx.doi.org/10.52571/ptq.v17.n36.2020.871_periodico36_pgs_856_870.pdf.

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Experience shows that the trend towards using solid fuels in the energy sector of Kazakhstan will be implemented for a rather long time. At the same time, the global trend is currently tightening environmental requirements. They set the task to continue improving coal combustion efficiency and minimize emissions of harmful substances and greenhouse gases into the atmosphere. This article aims to conduct complex thermal engineering tests of the KCVr-0.43 hot water boiler. For this, the following measurement and control tools were used: the standard boiler room secondary devices, an industrial gas analyzer Testo-350, a control (reading) module Testo-454 with temperature probes and a Pitot tube, a soot number meter Testo-308, a temperature meter 2TPM1, a portable liquid flow meter Vzlet-PRC and a stopwatch. All they had valid verification and calibration certificates. An analysis of the gas composition and technical parameters of the KCVr-0.43 hot water boiler in the investigated operation mode with Shubarkul coal during a long-term test showed that it seems possible to operate boilers of this series under low load conditions without boosting air and fuel. They can reduce emissions of toxic NOx and greenhouse gases CO2 into the atmosphere. In this case, burning Shubarkul coal without forcing through the air is characterized by significant carbon monoxide CO emissions. The formed nitrogen oxides NOx decompose in reactions with CO with the formation of molecular nitrogen and oxygen. Burning, coke residue in the layer, coal-burning stages, emissions of harmful substances.

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Journal articles on the topic 'Water-tube boilers'

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