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Journal articles on the topic 'Steam-gas cavity'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Jowkar, Amin, Farhang Sereshki, and Mehdi Najafi. "Numerical simulation of UCG process with the aim of increasing calorific value of syngas." International Journal of Coal Science & Technology 7, no. 1 (2019): 196–207. http://dx.doi.org/10.1007/s40789-019-00288-x.

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AbstractThe determination of operational parameters in the underground coal gasification (UCG) process should be considered in two aspects: first, the total coal in each UCG panel must be gasified and second, the calorific value of the produced gas should be acceptable. The main aim of this study is to present a model that meets these aspects and increasing the calorific value of syngas during this process. In order to achieve those aims, eight different increasing scenarios were devised for total gasification of coal per panel. These scenarios included: increasing oxygen injection rate (scena

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2

Borschev, N. O. "Methods for controlling temperature of the instrumentation equipment using the contour heat pipe." Proceedings of Higher Educational Institutions. Маchine Building, no. 3 (756) (March 2023): 110–19. http://dx.doi.org/10.18698/0536-1044-2023-3-110-119.

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The paper considers two ways of maintaining temperature of the instrumentation equipment: using the heat pipes equipped with thermoelectric cooling plate on the compensation cavity and the control valve installed at the outlet of the evaporating radiator. Since the temperature of the contour heat pipe is mainly controlled by the temperature of the compensation cavity positioned behind the evaporator, maintaining the high-precision temperature mode of this device is an urgent task for the entire spacecraft thermal regime. In the first method, the evaporating radiator is heated or cooled dependi

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3

Mallett, CW. "Environmental controls for underground coal gasification." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 1 (2017): 47–55. http://dx.doi.org/10.1177/0957650917723733.

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Effective environmental management of an underground coal gasification pilot has been demonstrated at Kogan in Queensland, Australia. It commenced with selection of a suitable site with a coal seam surrounded by impervious rocks that provided a gas seal for the gasifier and sufficient groundwater pressure to constrain lateral loss of gas and chemicals through coal fractures. Project infrastructure was specified to withstand the temperatures and pressures experienced during gasification and gas processing. During syngas production in the second gasifier, Panel 2, it was shown that all pyrolysis

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4

Nur Farhana Hayazi, Ku Adri Azhan Ku Mohamad, Junaidi Che Halim, and Shaiful Rizam Shamsudin. "Incoloy 800HT Weldolet Integrity in Hot Collector: Replica Testing Insights." International Journal of Nanoelectronics and Materials (IJNeaM) 17, December (2024): 205–17. https://doi.org/10.58915/ijneam.v17idecember.1627.

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In this paper, the integrity assessment of Primary Reformer’s hot collector weldolet in the fertilizer plant was conducted. It aims to discuss the findings of the relevant weldolet weldments which include dye penetrant test ultrasonic test, in-situ field metallography (replication), hardness measurements and rectification measures. The first step of the steam reforming process takes place in the Primary Reformer, where preheated hydrocarbon and steam mixture is passed downwards through vertical tubes containing catalyst. The hot gas that exited from the catalyst tubes is termed reformed gas an

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Ma, Xiao Xuan, Zeng He Li, Tij Je Cai, and Ya Zhen Liu. "Thermal Decomposition Dew Point Method for Determining the Trace Moisture in Ultra-Purity Ammonia." Advanced Materials Research 718-720 (July 2013): 571–75. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.571.

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This article introduced a fast and stable method on measuring the batches of trace moisture in ultra-purity ammonia gas .This method is based on ammonia decomposited reaction ,which occurs completely and irreversibly when ammonia is passed over nickel catalyst at high temperatures. While the trace water wapor passes though the catalyst unchanged. And the moisture of ammonia may be determined by measuring the dew point of the steam of hydrogen and nitrogen produced by decomposition of ammonia,combined with the trace oxygen content measured by GC,the content of trace moisture in ultra-purity amm

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6

KIM, BUMJOON, and BYEONGSOO LIM. "EVALUATION OF CREEP-FATIGUE LIFE BY FRACTION OF CAVITY AREA." International Journal of Modern Physics B 20, no. 25n27 (2006): 4237–42. http://dx.doi.org/10.1142/s021797920604115x.

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The components of power plant such as main steam pipe and gas turbines are operated under static and cyclic load conditions. As the period of static load increases, the service life of these components decreases. Generally, the increase of cyclic load results in fatigue damage and the increase of static load period results in the metallurgical degradation by the effect of creep. Under the creep-fatigue interaction, cavities cause rapid degradation of material and decreases the creep-fatigue life of high temperature components. In this paper, creep-fatigue tests were performed to investigate th

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7

Bayley, F. J., C. A. Long, and A. B. Turner. "Discs and Drums: The Thermo-Fluid Dynamics of Rotating Surfaces." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 207, no. 2 (1993): 73–81. http://dx.doi.org/10.1243/pime_proc_1993_207_103_02.

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This paper reviews long-term experimental and theoretical research programmes concerned with flow and heat transfer over the large rotating surfaces, commonly discs, often drums but sometimes conical, used to support the blades in turbomachinery. The account begins with a geometry found in turbomachinery from the oldest steam plant to the most modern gas turbine, in which a disc rotates near to a stationary, usually coaxial, member. The flow in the intervening ‘wheel-space’ is well understood, but external conditions can affect the extent and nature of ingress from the surrounding fluid. In th

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8

Reshetnikov, I.F., S.V. Shikhalev, and S.L. Tikhonov. "Influence of Non - Condensable Gases on the Processes of Heat and Mass Transfer during Film Condensation of Steam in Heat Exchangers." Problemele Energeticii Regionale 3(38) (December 15, 2018): 102–11. https://doi.org/10.5281/zenodo.2222362.

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The aim of the article is a quantitative assessment of the influence of non-condensable gases on the intensity of heat and mass transfer processes during film condensation of steam in the specific conditions for heat exchanger. The task is achieved by conducting experimental research of heat and mass transfer processes in film condensation of steam in the presence of non-condensable gases.The study was carried out by the method of stationary heat flow on an experimental kettle with a jacket (0,02 m3 capacity), industrial cooking boilers (0,04 m3 and 0,06 m3 capacity). Cylindrical kettles with

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9

Shen, Wenjie, Suofang Wang, Mengyuan Wang, Weilin Dong, and Kai Zhang. "Transient response and volume model of steam cooling in a rotor–stator disk cavity of gas turbines." Thermal Science and Engineering Progress 53 (August 2024): 102701. http://dx.doi.org/10.1016/j.tsep.2024.102701.

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10

Eden, T. J., T. F. Miller, and H. R. Jacobs. "The Centerline Pressure and Cavity Shape of Horizontal Plane Choked Vapor Jets With Low Condensation Potential." Journal of Heat Transfer 120, no. 4 (1998): 999–1007. http://dx.doi.org/10.1115/1.2825921.

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A study of plane, underexpanded, condensing vapor jets was undertaken using flash photography and a ventilated pressure probe. This study examined horizontal jets with much lower condensation driving potentials than have been previously studied. Photographic measurements of jet expansion angles, spread angles, cavity lengths, and cavity shapes were recorded and compared with numerical predictions using a parabolic, locally homogeneous flow model that had been modified to incorporate entrainment and condensation effects. When rendered dimensionless by the nozzle width rather than diameter, the

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11

Jamel, Mahmood S., A. Abd Rahman, and A. H. Shamsuddin. "Novel integrations of molten salt cavity tubular solar central receiver with existing gas-fuelled conventional steam power plants." International Journal of Sustainable Energy 35, no. 1 (2013): 21–32. http://dx.doi.org/10.1080/14786451.2013.858159.

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12

SAVYTSKYI, YURYI. "SIMULATION OF THE PROCESS OF FILLING POLYSTYRENE FOAM FOUNDRY MOLD WITH THE METAL." Herald of Khmelnytskyi National University. Technical sciences 319, no. 2 (2023): 263–67. http://dx.doi.org/10.31891/2307-5732-2023-319-1-263-267.

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Modern approaches to prefabrication production consist in the maximum approximation of the shape and size of the blanks to the finished part, which essentially makes the final part cheaper. One of the methods of precision casting is casting in gasified models, or foam models. The basis is the task of developing a theoretical model of filling a polystyrene foam model with liquid metal. The analysis of the process of filling the mold with a gasified model and the process of filling the mold with a closed sprue system are considered. The analysis of the obtained solutions shows that the movement

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13

Bolotnova, R. Kh, and V. A. Korobchinskaya. "The formation features of supercritical steam-water jets (review)." Multiphase Systems 17, no. 1-2 (2022): 27–37. http://dx.doi.org/10.21662/mfs2022.1.003.

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The review of works on study of dynamics formation of water fluid jet of supercritical parameters outflowing from a high-pressure chamber through a thin nozzle has been carried out. The system of model equations describing the dynamics of outflow processes in both single-phase and multiphase gas-vapor-liquid media is considered. It based on the laws of conservation of mass, momentum and energy of phases in accordance with single-pressure, single-speed and two-temperature approximations with the allowance for contact-type heat transfer and mass transfer for evaporation and condensation under eq

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14

Jamel, Mahmood S., A. Abd Rahman, and A. H. Shamsuddin. "Repowering of existing AL-Hartha gas-fuelled conventional steam power plant with molten salt cavity tubular solar central receiver." Clean Technologies and Environmental Policy 16, no. 8 (2014): 1661–74. http://dx.doi.org/10.1007/s10098-014-0740-9.

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15

Arup Kumar Biswas, Wasu Suksuwan, Khamphe Phoungthong, and Makatar Wae-hayee. "Effect Of Equivalent Ratio (ER) On the Flow and Combustion Characteristics in A Typical Underground Coal Gasification (UCG) Cavity." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 86, no. 2 (2021): 28–38. http://dx.doi.org/10.37934/arfmts.86.2.2838.

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Underground Coal Gasification (UCG) is thought to be the most favourable clean coal technology option from geological-engineering-environmental viewpoint (less polluting and high efficiency) for extracting energy from coal without digging it out or burning it on the surface. UCG process requires only injecting oxidizing agent (O2 or air with steam) as raw material, into the buried coal seam, at an effective ratio which regulates the performance of gasification. This study aims to evaluate the influence of equivalent ratio (ER) on the flow and combustion characteristics in a typical half tear-d

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16

Kutovyi, Volodymyr. "Thermal Vacuum Process of Dispersing Heterogeneous Materials." American Journal of Physics and Applications 13, no. 3 (2025): 59–67. https://doi.org/10.11648/j.ajpa.20251303.12.

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The presented work examines physical processes in a thermal vacuum installation, which allow for the effective dispersion of heterogeneous materials within 15 seconds. An analysis of heat and mass transfer processes that affect the dispersion of heterogeneous materials been carried out. Calculations of the speed, frequency and wavelength in spiral heating element of the thermal vacuum installation been made for different angles of motion of material particles. It been established that the speed of motion of a material particle in the cavity of the heating element can be more than a thousand ki

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17

Kutovyi, V. O. "Thermal - vacuum process producing nanodispersed materials." Surface 16(31) (December 30, 2024): 152–63. https://doi.org/10.15407/surface.2024.16.152.

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Experimental methodology of the thermal vacuum process is that in order to obtain effective and economical production of nanomaterials, it is necessary to ensure a continuous flow of dispersed material inside the heating spiral element. This can done if the material enters the cavity of the heating element together with air. A two-phase system of gas-solid particles arises. The movement occurs in an ascending flow in a heated space with a constant decrease in pressure for 15 s. The results of the studies show that the velocity of material particles in the cavity of spiral heating element of th

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18

Gutowska, Izabela, Robert Kile, Brian G. Woods, and Nicholas R. Brown. "Intracore Natural Circulation Study in the High Temperature Test Facility." Journal of Nuclear Engineering 5, no. 4 (2024): 500–517. http://dx.doi.org/10.3390/jne5040031.

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The development of the Modular High-Temperature Gas-Cooled Reactor is a significant milestone in advanced nuclear reactor technology. One of the concerns for the reactor’s safe operation is the effects of a loss-of-flow accident (LOFA) where the coolant circulators are tripped, and forced coolant flow through the core is lost. Depending on the steam generator placement, loop or intracore natural circulation develops to help transfer heat from the core to the reactor cavity, cooling system. This paper investigates the fundamental physical phenomena associated with intracore coolant natural circ

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19

Кутуков, Сергей Евгеньевич, Валерий Юрьевич Морецкий, Владимир Васильевич Жолобов та Ольга Витальевна Четверткова. "Формирование самотечного участка в магистральном трубопроводе". SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION 14, № 5 (2024): 400–410. https://doi.org/10.28999/2541-9595-2024-14-5-400-410.

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Проблемными вопросами при эксплуатации трубопроводов с самотечными участками являются повышение точности прогнозного расчета геометрических и гидравлических параметров псевдокавитационной полости (ПКП) на стационарных и переходных режимах перекачки, включая образование, стабилизацию и различные варианты заполнения ПКП. Для решения этих вопросов предложено дополнить классические модели двухфазных газожидкостных расслоенных течений описанием феномена сорбции/десорбции растворенных газов и фазовых переходов легких компонентов в смесях углеводородов нефти. Установлено, что давление жидкости ПКП су

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20

Adam, Malik. "Multi-domain Vibrations Response of Externally Excited Fluid Conveyer Pipe in Industrial Steam Generator." Hyperscience International Journals 2, no. 1 (2022): 36–45. http://dx.doi.org/10.55672/hij2022pp36-45.

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Electric power is an indispensable consumer commodity for a little over a century now as all electric equipment in dwellings, commercial, and industry sectors are essentially dependent on electricity. Heat recovery steam generator, HRSG is an important system in combined cycle power plants. Indeed, excess vibrations induced on such devices may gradually lead to fatigue failure that affect the process of power output. This work investigates, models, and simulates the vibrations response of a fluid carrier pipe housed inside the cavity of the system while experiencing highly pressurized nearly p

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21

Kutovyi, Volodymyr. "Thermal Vacuum Synthesis: Physical Processes in Nanomaterial Production." American Journal of Physics and Applications 12, no. 4 (2024): 69–77. https://doi.org/10.11648/j.ajpa.20241204.11.

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The thermovacuum process offers an efficient and cost-effective method for producing nanomaterials by ensuring the continuous flow of dispersed material inside a spiral heating element. This is achieved by introducing the material into the heating element&apos;s cavity along with air, forming a two-phase gas-solid particle system. The material moves upward through the heated space, where pressure gradually decreases. Experimental studies on materials like carbon, brown coal, and zirconium dioxide indicate specific conditions are necessary for the system&apos;s continuous operation. One

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22

Vovchenko, A.I., L.Yu. Demidenko, and I.N. Starkov. "Algorithms for Calculating Parameters of Combined Electric Discharge Source of Energy in High-Voltage Electrochemical Explosion in Confined Volumes." Elektronnaya Obrabotka Materialov 54(3) (June 15, 2018): 69–73. https://doi.org/10.5281/zenodo.1297941.

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Based on the experimental research data, the algorithm for calculating the parameters of combined electric discharge power sources using a high-voltage electrochemical explosion (HVEE):parameters of the pulse current generator, the length of the discharge gap, and the mass of the exothermic composition, has been developed. These parameters provide the energy characteristics specified by the technology in a confined volume. In order to eliminate multiple solutions in the proposed algorithm, it is recommended to consider the amount of the released chemical energy per unit of electric energy

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23

Shen, Liang C. "A Laboratory Technique for Measuring Dielectric Properties of Core Samples at Ultrahigh Frequencies." Society of Petroleum Engineers Journal 25, no. 04 (1985): 502–14. http://dx.doi.org/10.2118/12552-pa.

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Abstract This paper describes an automated laboratory system that can measure accurately the dielectric properties of core samples in the ultrahigh-frequency properties of core samples in the ultrahigh-frequency (UHF) range. The system consists of a precision coaxial-line sample holder, a network analyzer, a plotter, a printer, and a desk computer. The computer is for measurement control, data acquisition, and data analysis. A new method is developed to measure and to compensate for the error of the network analyzer system. This method uses a brass sample and does not require standard terminat

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24

Zhong, Mingjun, Yankai Li, Meng Lin, Minghao Yuan, and Yanhua Yang. "A Numerical Analysis Research on Earlier Behavior of Molten Droplet Covered with Vapor Film at the Stage of Triggering and Propagation in Steam Explosion." Science and Technology of Nuclear Installations 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/301262.

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When the molten fuel with high temperature falls into the cavity water, it will be dispersed into droplets which are covered with vapor films due to the rapid heat transfer with phase transition. This situation cannot be simply described by liquid-liquid or gas-liquid systems. And there are no sufficient experimental studies on the behavior of droplet covered with vapor film because of the rapid reaction and the difficulty in capture of the film configuration. In this paper, a multiphase code with the volume of fluid (VOF) method is used to simulate the earlier behavior of droplet when vapor f

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25

Zhang, Zuo-Yi, Yu-Jie Dong, Qi Shi, Fu Li, and Hai-Tao Wang. "600-MWe high-temperature gas-cooled reactor nuclear power plant HTR-PM600." Nuclear Science and Techniques 33, no. 8 (2022). http://dx.doi.org/10.1007/s41365-022-01089-9.

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AbstractThe HTR-PM600 high-temperature gas-cooled reactor nuclear power plant is based on the technology of the high-temperature gas-cooled reactor pebble-bed module (HTR-PM) demonstration project. It utilizes proven HTR-PM reactor and steam generator modules with a thermal power of 250 MWth and power generation of approximately 100 MWe per module. Six modules in parallel, connected to a steam turbine, form a 600-MWe nuclear power plant. In addition, its system configuration in the nuclear island is identical to that of the HTR-PM in which the technical risks are minimized. Under this principl

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26

Andrés, Luis San, Tingcheng Wu, Jose Barajas-Rivera, Jiaxin Zhang, and Rimpei Kawashita. "Leakage and Cavity Pressures in an Interlocking Labyrinth Gas Seal: Measurements Versus Predictions." Journal of Engineering for Gas Turbines and Power 141, no. 10 (2019). http://dx.doi.org/10.1115/1.4044284.

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Gas labyrinth seals (LS) restrict secondary flows (leakage) in turbomachinery and their impact on the efficiency and rotordynamic stability of high-pressure compressors and steam turbines can hardly be overstated. Among seal types, the interlocking labyrinth seal (ILS), having teeth on both the rotor and the stator, is able to reduce leakage up to 30% compared to other LSs with either all teeth on the rotor (TOR) or all teeth on the stator. This paper introduces a revamped facility to test gas seals for their rotordynamic performance and presents measurements of the leakage and cavity pressure

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27

Bisset, David K. "Piecewise-Focusing Collectors Reduce the Mirror Area in Concentrating Solar Thermal Power Plants." Journal of Solar Energy Engineering 144, no. 5 (2022). http://dx.doi.org/10.1115/1.4054027.

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Abstract Piecewise-focusing (PWF) collectors replace the heliostat field and central tower receiver of Gen 2 concentrating solar thermal (CST) power plants. The PWF collector consists of a large base frame supporting a tiered array of reflectors that concentrate sunlight into a cavity receiver. The base frame rotates about a central pivot to track the sun in azimuth, while the reflectors rotate about individual nearly horizontal inclined axes to track the sun in elevation. Compressed gas such as CO2 is used as the heat transfer fluid (HTF) from the receiver to a conventional molten-salt therma

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28

Ji-Long, Huang, Liu Xiu-Ying, Chen Hao, Li Xiao-Dong, and Yu Jing-Xin. "High-throughput screening and evaluation of double-linker metal-organic frameworks for CO₂/H₂ adsorption and separation." Chinese Physics B, November 14, 2024. http://dx.doi.org/10.1088/1674-1056/ad925a.

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Abstract The CO2 capture from CO2/H2 gas mixtures in syngas is a crucial issue for hydrogen production from steam methane reforming in industry, as the presence of CO2 directly affects the purity of H2. A combination of high-throughput screening method and grand canonical Monte Carlo simulation was utilized to evaluate and screen 1725 metal-organic frameworks in detail as a means of determining their adsorption performance for CO2/H2 gas mixtures. The adsorption and separation performance of double-linker MOFs was comprehensively evaluated using eight evaluation indicators, namely the largest

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29

Curcio, Axel, Sylvain Rodat, Valéry Vuillerme, and Stéphane Abanades. "Experimental assessment of woody biomass gasification in a hybridized solar powered reactor featuring direct and indirect heating modes." International Journal of Hydrogen Energy, October 29, 2021. https://doi.org/10.1016/j.ijhydene.2021.09.008.

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Solar thermochemical gasification is an opportunity for the production of sustainable fuels from carbonaceous resources including biomass. Substituting conventional gasification processes by solar-driven technologies may enable cleaner production of H<sub>2</sub>-rich syngas while saving feedstock resources and alleviating CO<sub>2</sub> emissions. This work addresses hybrid solar-autothermal gasification of mm-sized beech wood particles in a lab-scale 1.5 kW<sub>th</sub> spouted-bed reactor. Hybridization under reduced solar power input was performed by injecting

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