Relevant bibliographies by topics / Forced circulation boiler

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Forced circulation boiler'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Forced circulation boiler"

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Bao, Junjie, Di Wang, Feng Liu, Zhiguo Qu, and Hongtao Xu. "Transient Evaporation Simulation of the Forced Circulation Hot Water Boiler." IOP Conference Series: Materials Science and Engineering 721 (January 7, 2020): 012068. http://dx.doi.org/10.1088/1757-899x/721/1/012068.

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Han, Ying-kun, Lin Mou, Wei-ming Liu, Peng-wei Yang, and Xiang-Kun Pang. "Optimization and research of primary frequency compensation strategy of the unit with supercritical forced circulation boiler." E3S Web of Conferences 38 (2018): 01050. http://dx.doi.org/10.1051/e3sconf/20183801050.

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The paper introduces the theory and application of Power Plant's primary frequency compensation(PFC) on the unit with the supercritical forced circulation boiler. First of all,the paper gives the typical parameters Setting and logic design of PFC. Then it explains some adverse factors which affect the PFC of the unit. With some problems in the operative process, the typical control strategy and some advices are given , which can improve PFC ability of Power Plant's PFC.
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SEREDA, B. P., V. I. SUKHOMLIN, V. I. VOLOKH, and D. B. SEREDA. "ANALYSIS OF THE REASONS FOR CRACKING PIPES OF THE BOILER OF THE RECOVERY." Ukrainian Journal of Civil Engineering and Architecture, no. 1 (June 24, 2021): 95–101. http://dx.doi.org/10.30838/j.bpsacea.2312.230221.96.723.

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8-381X Abstract. Formulation of the problem. One of the main tasks of production is reliable and trouble-free operation of equipment. In the oxygen-envelope process, when cast iron is purged, a large amount of carbon monoxide CO is emitted in the converter, which has a high temperature of more than 1 700 °С of the outgoing gases. The envelope gases in the waste heat boiler are cooled. Converter gas output is characterized by cyclic unevenness In this case, uneven heating of the walls of the boiler pipes occurs. By circulation pumps, chemically purified water is supplied for forced cooling of the boiler walls. When raising the outgoing gases, the cooling water is converted to pars by its subsequent supply to the consumer. The study is dedicated to solving the scientific and applied problem for the reasons for the formation of defects and the identification of cracks in the pipes of the recovery boiler.The purpose of the work. To investigate the causes of the development of transverse cracks in the pipelines of the recovery boiler by various methods of non-destructive testing, to use the methods of scanning microscopy to analyze the microstructure, mechanical tests, and the magnetic properties of structural carbon steel. Conclusions. One of the main reasons for the appearance of massive cracks in the pipes of cylindrical caissons is thermal fatigue caused by high thermal loads. Transverse cracks have the character of thermal fatigue failure, which is confirmed by changes in the ferrite-pearlite structure of the metal, resulting from uneven local cooling of the walls of the caisson. The reasons for the violation of the water circulation in the boiler are the pressure drop in the boiler and a sharp discharge, the load is the release of water from the boiler.
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Sagaf, Muhammad. "Analisa faktor-faktor penyebab perubahan efisiensi boiler jenis pulverized coal fired forced circulation sub-critical pressure menggunakan metode tak langsung." Teknoin 24, no. 2 (March 1, 2018): 147–58. http://dx.doi.org/10.20885/teknoin.vol24.iss2.art5.

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Elgandelwar, Atul M., Radhe S. Jha, and Mandar M. Lele. "Steady State Two-Phase Flow Analysis of Natural Circulation in Hybrid Boiler." International Journal of Heat and Technology 38, no. 4 (December 31, 2020): 941–48. http://dx.doi.org/10.18280/ijht.380421.

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In this present works, a generalized approach for the two-phase flow analysis of a natural circulation in hybrid boiler. The model uses the combination of node and loop equations and the Newton Raphson technique for the solution of the set of equations. Loop equations have been developed for each evaporator tube with the unique driving force and pressure drop of the concerned loop. Node equations are mainly developed for common risers and downcomers. A unique connectivity matrix has been used to correlate each branch flow with loop and node equations. The model is validated by a unique indirect method by comparing the actual water level and calculated water level. Experiments have been performed with uniform diameter of tubes in 53 channels circulating loop to find the volume of steam. The model shows good agreement with experimental investigations with a maximum of 3.57% absolute error. The model can be used for the design, analysis, and optimization of the natural circulation network.
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Mirek, Paweł. "Experimental investigation of the flow characteristics of low-pressure drop air nozzles working with CFB boilers." E3S Web of Conferences 82 (2019): 01013. http://dx.doi.org/10.1051/e3sconf/20198201013.

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The paper presents the most important flow characteristics of low-pressure drop primary air nozzles used in circulating fluidized bed boilers. The role of an air nozzle pressure drop, pressure fluctuation, as well as air jet penetration length, orifice outlet jet kinetic energy and aerodynamic drag force of the gas outlet jet have been discussed. For the purpose of cold model studies the Lagisza 966MWth supercritical CFB boiler operating at the company TAURON Wytwarzanie SA, Poland has been chosen as the reference facility. In the experimental tests, three types of primary air nozzles with comparable static pressure drop and varied aerodynamic drag force have been tested. The experiments clearly showed that the pressure drop cannot be the only parameter characterizing the operation of the primary air nozzle and the air jet penetration length is determined primarily by the orifice outlet jet kinetic energy and not by the outlet jet velocity.
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Ishibashi, Shinichiro, Toshihiko Sato, Koichi Haneda, and Masahiro Seki. "Ferromagnetic Substance Formed in Circulating Water for Boiler and Steam Piping." Journal of the Japan Society of Powder and Powder Metallurgy 42, no. 1 (1995): 47–52. http://dx.doi.org/10.2497/jjspm.42.47.

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Wen, Feng Yu, Qiang Wang, Xian Bin Dong, Hong Liang Ma, and Gang Tian. "Application of Low-Position Vacuum Deaerator in Steam Injection Boiler Supply Water Deaeration in Oil Fields." Advanced Materials Research 549 (July 2012): 1032–36. http://dx.doi.org/10.4028/www.scientific.net/amr.549.1032.

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A high level of oxygen in boiler supply water would lead to oxidation corrosion of the boiler tubes. Reduction of the boiler tube thickness will affect its service life even result in such serious accidents as tube explosion. In S oil-field, a combining measure of physical and chemical methods were adopted to improve deaerator technology. A relatively complete ground deaeration process is formed. The deaeration system consists of water ring vaccum pump, deaeration tank, booster pump, circulating tank, etc. First softened water processed by softener would flow through 80 mesh stainless steel screen filter. Then in high vacuum deaeration tank, the water will be ejected in a spray due to the eddying flow of the nozzles and size of the droplet can reach 30 micrometer. Oxygen partial pressure in the tank is in a minimal level so that dissolved oxygen in the water-drops can be released. The steam and released oxygen will be sent to circulating tank for recycling. Deoxidation rate of the process can be above 95% and residual dissolved oxygen can be removed by chemicals. So the boiler supply water can meet technical requirements. The deaeration system has a good application in boiler supply water deaeration in S oil-field. Practical application shows the deaeration system has characteristics of stable performance, mainly maintenance-free, and good adaptability to some poor-quality water. So the deaeration system has a good promotion value.
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Vijayan, P. K., A. K. Nayak, D. Saha, and M. R. Gartia. "Effect of Loop Diameter on the Steady State and Stability Behaviour of Single-Phase and Two-Phase Natural Circulation Loops." Science and Technology of Nuclear Installations 2008 (2008): 1–17. http://dx.doi.org/10.1155/2008/672704.

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In natural circulation loops, the driving force is usually low as it depends on the riser height which is generally of the order of a few meters. The heat transport capability of natural circulation loops (NCLs) is directly proportional to the flow rate it can generate. With low driving force, the straightforward way to enhance the flow is to reduce the frictional losses. A simple way to do this is to increase the loop diameter which can be easily adopted in pressure tube designs such as the AHWR and the natural circulation boilers employed in fossil-fuelled power plants. Further, the loop diameter also plays an important role on the stability behavior. An extensive experimental and theoretical investigation of the effect of loop diameter on the steady state and stability behavior of single- and two-phase natural circulation loops have been carried out and the results of this study are presented in this paper.
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Ishibashi, S., T. Sato, K. Hanada, M. Yokoyama, and G. Yamauchi. "Substances Formed in Water Circulating in Boilers and Steam Piping and Their Magnetic Removal." Journal of the Magnetics Society of Japan 22, S_1_ISFA_97 (1998): S1_408–410. http://dx.doi.org/10.3379/jmsjmag.22.s1_408.

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Dissertations / Theses on the topic "Forced circulation boiler"

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Hradil, Lukáš. "Posouzení kotle na odpadní teplo." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228700.

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This theses work is concerned with assessment of transfer line exchanger behind pusher furnace. First part is describing technical characteristic and parametres. The most important part of this theses is thermic calculation of the boiler. Last following part is concerned with suggestions of constructional modifications of heating surface for proper functioning of boiler. These modifications are demonstrated by scheme in the enclosure.
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Dufek, Martin. "Vytápění bytového domu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225581.

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The main concern of this thesis is to design heating system for 5 storey apartment building in two alternatives of heat source - with a heat pump and with traditional gas boiler. Both applications are connected to two-pipes distribution system in building using the low-temperature water and radiators. The proposal takes account of the the production of hot water. The one of aims is to compare both variants also from the economic point of view. The experimental part is divided into two parts. The first part deals with the obligation to control efficiency of boilers, imposed by the Energy efficiency law No. 177/2006 Co. and § 6, sect. 2 - 5 and related regulation No. 276/2007 Co. The second part deals with the assessment of monitored room for proper regulation of the heating system.
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Book chapters on the topic "Forced circulation boiler"

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Basu, Prabir, Cen Kefa, and Louis Jestin. "Forced Circulation for Supercritical or Subcritical Boilers." In Mechanical Engineering Series, 372–84. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1250-8_13.

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Conference papers on the topic "Forced circulation boiler"

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Park, Hyunjae, Anthony Bowman, Tod Stansfield, Brian Huibregtse, Steve Wilkinson, and Willie Ayala. "Effect of Boiler Feedwater Inlet Locations on the Water Circulation Characteristics in a Firetube Boiler With the Non-Symmetrically Arranged Tube Passes 3 and 4." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33043.

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Since the furnace section of a boiler is the primary heat transfer surface for the production of vapor, the overall water circulation patterns in the boiler will be significantly influenced by the circulation patterns near the furnace area. Boiler water circulation characteristics for a newly designed 4-pass firetube boiler with the non-symmetric arrangement of tube passes 3 and 4 were investigated in the previous work [1], in which the attraction forces between 28 different temperature nodes on the furnace wall were evaluated to predict the characteristics of water circulation near the boiler furnace. It was found that various non-symmetric water circulation patterns would occur for different firing conditions. As a consequence, in this paper, the analysis methods developed in the authors’ previous work are explicitly employed to predict and improve the water circulation in a firetube boiler when 6 different boiler feedwater inlet locations (3 on the right-hand side and 3 on the left-hand side of the boiler vessel shell) are used. Each side has 3 different feedwater inlet locations below the centerline of the boiler pressure vessel along its length. Investigation of the analysis results reveals that non-symmetric water circulation patterns are not unavoidable, but improvements in the water circulation and potentially the heat transfer rate can be achieved when the boiler feed water inlet is located near the front head of the boiler pressure vessel.
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Dutta, Animesh, Amar Sen, and Prabir Basu. "Revamping of 2×32 MWe Pulverized Coal-Fired Boilers With Circulating Fluidized Bed Firing." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78109.

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A techno-economic feasibility study has been conducted to investigate revamping two 32 MWe pulverized-coal (PC) boilers with circulating fluidized bed (CFB) firing. The steam generators at Panki Thermal Power Station in Kanpur, Uttar Pradesh, are owned by Uttar Pradesh Rajya Vidyut Utpadon Nigam Limited (UPRVUNL), supplied by Waagner Biro, Austria, and commissioned in 1967–68. The study reveals that: (i) CFB revamping of the boilers is technically feasible and economically viable; (ii) Performance improvement of the plant is significant in terms of such indices as plant load factor, forced outage and a auxiliary oil consumption, among others. The expected performance improvement is due in large part to the elimination of key outage-prone components such as pulverizers (mills) and burners. (iii) Significant improvement in emissions performance due to the reduction in emissions of NOx and fly ash is projected. (iv) The financial analysis indicates that the CFB revamping option gives the highest return on investment compared to alternatives. Finally, to demonstrate the technical soundness and viability of the special design used in this revamping a sub-scale CFB boiler has been design and built at another power plant.
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Rath, D., and A. Koller. "Vertical Design HRSG With Natural Circulation Successfull in Operation." In ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-121.

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At the beginning of the Sixties the concept of Combined Cycle Power Plants (CCPP) was introduced to the market in parallel to the Standard Steam Power Plants. Based on the experience of Waste Heat Boilers, built behind the blast oxygen furnaces of steel mills, Heat Recovery Steam Generators (HRSG) with forced or assisted circulation as well as of the natural circulation type were developed. The latest version of HRSG’s, the vertical type with heating surfaces horizontally arranged and natural circulation only, was put into succesfull operation in 1995. Development and experiences shall be presented.
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Chen, Han-Ping, Shi-Hong Zhang, Zheng-Shun Wu, De-Chang Liu, Chu-Guang Zheng, Jun Wu, Yongjiang Yu, et al. "Research and Development of Π-Shaped CFB Boiler With Down-Exhaust Cyclone Separator." In 17th International Conference on Fluidized Bed Combustion. ASMEDC, 2003. http://dx.doi.org/10.1115/fbc2003-077.

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In recent years, the circulating fluidized bed (CFB) boiler has been rapidly developed. Various CFB technology styles and boiler types have been formed. There are 3 main kinds of CFB technologies developed by universities and institutes in China. One of them is Π-shaped CFB boiler with down-exhaust cyclone separator designed by the National Laboratory of Coal Combustion (NLCC) in Huazhong University of Science and Technology (HUST). This paper summarizes the technology improvement and progress of this kind of boiler, and discusses the design considerations. This paper also describes some issues in shakedown and operation process of a 75t/h Π-shaped CFB boiler.
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Sen, A. N., L. Miller, P. Basu, and A. Dutta. "Revamping of 4 x 58 MWth Pulverized Coal-Fired Boilers With Circulating Fluidized Bed Firing." In 17th International Conference on Fluidized Bed Combustion. ASMEDC, 2003. http://dx.doi.org/10.1115/fbc2003-163.

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A techno-economic feasibility study has been conducted to investigate revamping four 58 MWth (15 MWe) pulverized-coal (PC) boilers with circulating fluidized bed (CFB) firing. The steam generators at Amarkantak Thermal Power Station in Chachai, Madhya Pradesh, are owned by Madhya Pradesh State Electricity Board (MPSEB), supplied by Simmering-Graz-Pauker AG of Vienna, Austria, and commissioned in mid-1965. The study reveals that: (i) CFB revamping of the boilers is technically feasible and economically sound; (ii) Performance improvement of the plant is significant in terms of such indices as plant load factor, forced outage and auxiliary oil consumption, among others. The expected performance improvement is due in large part to the elimination of key outage-prone components such as pulverizers (mills) and burners. (iii) There is significant improvement in emissions performance due to the reduction in emissions of NOx and fly ash; (iv) The financial analysis indicates that the CFB revamping option gives the highest return on investment compared to alternatives.
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Plotkin, Andrew R., Kevin M. Toupin, Craig B. Gillum, Robert J. Rancatore, Tianliang Yang, and Diego Mier. "Solar Receiver Steam Generator Design for the Ivanpah Solar Electric Generating System." In ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASMEDC, 2011. http://dx.doi.org/10.1115/power2011-55248.

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The movement for energy independence coupled with aggressive renewable energy goals and government investment incentives has led the power industry to develop efficient and reliable sources of renewable power. In a power tower system a central Solar Receiver Steam Generator (SRSG) is surrounded by a field of mirrors (heliostats) that focus and concentrate sunlight onto the receiver tubes. The energy from the sunlight is used to generate and superheat steam for electric production. The Ivanpah Solar Electric Generating System (ISEGS) project, located in Ivanpah, CA, consists of three 126 MWg units, to power approximately 140,000 homes. The Ivanpah SRSG’s are forced circulation drum-type boilers with single reheat; located on top of a 400 ft (122 m) steel tower [1]. This paper will discuss the development, constraints, and unique design challenges of the Riley Power Inc. (RPI) SRSG selected for the Ivanpah project. Process descriptions and predicted unit performance are presented, along with comparisons to typical fossil boilers. First of kind concepts and engineering design achievements are discussed for what will be the largest power tower project in the world.
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Ho, Son H., and Muhammad M. Rahman. "Transient Thermal Analysis of Cryogenic Liquid Hydrogen Tank With Active Circulation." In ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36195.

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This paper presents the transient analysis of fluid flow and heat transfer in a zero boil-off (ZBO) cryogenic storage tank of liquid hydrogen. The system includes a tank with cylindrical wall and oblate spheroidal top and bottom, a heat pipe located along the symmetric axis of the tank, and an active circulator. The heat pipe has a rounded evaporator section at its end. The active circulator is an assembly of a pump body, a suction tube for collecting fluid inside the tank, and a spray nozzle from which the fluid is discharged onto the evaporator section of the heat pipe, which is kept at a constant low temperature, where the heat is removed passively to the condenser section of the heat pipe located outside the tank and eventually to the ambient via a cryocooler. Whenever the maximum temperature inside the tank reaches the boiling point under the working pressure in the tank, the pump is activated to create a forced flow from the nozzle to cool off the heated fluid. After a preset period of time, the pump is shut down and standby until the maximum temperature reaches its threshold again and then the pump starts a new cycle. The transient simulations allow the visualization of flow field and temperature distribution, as well as the computation of maximum and mean temperatures of the fluid at various stages of the pump cycle.
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Coda Zabetta, Edgardo, Patrik Yrjas, Mikko Hupa, Juha Roppo, and Marko Nylund. "Optimizing Ammonia Injection in Bio-Fuelled CFBCs." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78114.

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The reduction of nitrogen oxides (NOx) via ammonia injection (NH3) was investigated for circulating fluidized bed combustors (CFBCs) fuelled with mixtures of coal, peat, wood, bark, and logging residues. The reference boiler was the Alholmen Kraft, i.e. the largest co-fired unit in the world (550 MWth, 194 kg/s, 165 bar, 545 °C). The boiler featured ammonia injectors at the cyclone. Fuel composition, gas composition, and temperature were measured at suitable locations along the boiler while operating with diverse fuel mixtures. A chemical model was developed for analyzing the NOx reduction and was validated against measurements. The model accounts for the elemental composition of fuels, the composition of gases at the cyclone and in the stack, and the profile of temperature from cyclone to stack. The chemical reactions downstream the ammonia injection are described by gas-phase detailed chemical kinetics and accounting for ideal mixing. Measurements and simulations reveal that NOx reductions of over 50% are achievable for any fuel mixture and with moderate amounts of ammonia. Reductions are mainly affected by the temperature. All simulations show the existence of a maximum reduction vs. temperature, whose extent and location is affected by the concentrations of CO, NO, and the molar ratio [NH3]injected/[NO]cyclone. Simulations also indicate that with fuel mixtures other than the mixtures used in the reference boiler the maximum reduction is also affected by the concentrations of H2O, O2, CxHy, and N2O. Finally, simulations suggest an additional strategy for reducing emissions in co-fired CFBCs, where the N2O formed from coal is used to support the NOx reduction by ammonia, thus reducing NOx while maintaining acceptable N2O emissions. Further investigation is necessary for clarifying the details of this strategy. Under all circumstances, the only N-based pollutants predicted in detectable amounts are NO and N2O.
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Ada´nez, Juan, Luis F. de Diego, Pilar Gaya´n, Francisco Garci´a-Labiano, Andre´s Cabanillas, and Alberto Bahillo. "Co-Combustion of Biomass and Coal in Circulating Fluidized Bed: Modeling and Validation." In 17th International Conference on Fluidized Bed Combustion. ASMEDC, 2003. http://dx.doi.org/10.1115/fbc2003-064.

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In this work carbon combustion efficiencies in circulating fluidized bed combustion (CFBC) when co-firing biomass and coal mixtures were studied. Experimental results were obtained from the combustion of two kind of coals with a forest residue (Pine bark) in a CBF pilot plant (0.3MWth) with 20-cm i.d. and 6.5-m height. The effect of operating conditions such as percentage of biomass in the feed, temperature, excess air, air velocity and percentage of secondary air on carbon combustion efficiency was studied. A mathematical model for the co-combustion of coal and biomass in a circulating fluidized bed boiler has been developed. The riser is divided in three zones with different hydrodynamic characteristics: bottom, splash and freeboard. The bottom bed has a constant voidage, determined by a modified two-phase theory. The solids are considered in perfect mixing and the gas in plug flow. The voidage in the splash region follows an exponential decay model. In the freeboard region, the solids and the gas are in plug flow, and a core-annulus structure is considered. Devolatilization of solid fuels is modeled with a particle reaction model which allows to determine the volatiles generation rate as a function of time and operating conditions. Kinetics of char combustion is modeled with the shrinking particle model with mixed control by chemical reaction and gas film diffusion, assuming that the ashes separate once formed. To consider that the char particles are a mixture of coal and biomass char particles, a weighted average combustion rate is defined taking into account the individual combustion rates. Population balances of char particles in the different regions were developed to calculate carbon concentrations. The developed model can predict the different gas concentrations along the riser, such as oxygen, SO2, CO, CH4, etc..., and the carbon combustion efficiency. The experimental results of carbon combustion efficiencies and gas emissions were compared with those predicted by the model and a good correlation was found for all the conditions used.
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Gulshani, P., and H. M. Huynh. "Modeling Single-Phase Counter-Current Natural Convection Heat Removal in Horizontal Heated Channel Connected to Vertical Piping." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72656.

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This paper develops a simple mathematical model to examine the heat transfer phenomena in a single-phase counter-current subcooled water flow in a volumetrically heated horizontal channel connected to an unheated vertical pipe at each end as shown in Figure 1. In Figure 1, the heated horizontal channel and the vertical pipes connected to it are initially filled with subcooled water up to a certain height in the vertical pipes. The vertical pipes can have horizontal runs. The piping arrangement in the model with horizontal fuel (i.e., heated) channels and vertical feeder pipes is relevant to a reactor such as the Canadian Deuterium Uranium (CANDU) reactor. The single-phase water flow condition considered in the model is relevant to CANDU in a shutdown, maintenance state where the main heat-transport-circuit pumps are shutoff and the shutdown-cooling pumps are or become unavailable. Under such postulated loss-of shutdown-cooling pump scenario, it is desirable to know whether the fuel fission-product decay heat can be adequately removed by single-phase subcooled water natural-circulation flow before the water in the fuel channels begins to boil. Boiling and the resulting two-phase conditions, condensation and changes in the buoyancy forces induce intermittent flow in the channel causing intermittent limited fuel heatup Ref [1–3]. Unlike counter-current flow of gas and liquid, counter-current flow of liquids, particularly the same miscible unequal-temperature liquids and in the geometry considered in this paper has not been studied either theoretically or experimentally to the authors’ knowledge.
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