The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Yei Chin Chao - One of the best experts on this subject based on the ideXlab platform.
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design of a novel hydrogen syngas Catalytic mesh Combustor
International Journal of Hydrogen Energy, 2009Co-Authors: Hung Wei Hsu, Yung Sheng Lien, Yei Chin ChaoAbstract:Abstract A small-scale wire-mesh Catalytic Combustor is developed and evaluated for hydrogen–syngas combustion in domestic power/heating generator. The single- and double-layer wire-mesh catalysts are tested to verify their performance on CO conversions. Experimental results indicate that the double-layer wire-mesh Catalytic Combustor yields a higher CO conversion ratio (>90%) than that (
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Design of a novel hydrogen–syngas Catalytic mesh Combustor
International Journal of Hydrogen Energy, 2009Co-Authors: Hung Wei Hsu, Yung Sheng Lien, Yei Chin ChaoAbstract:Abstract A small-scale wire-mesh Catalytic Combustor is developed and evaluated for hydrogen–syngas combustion in domestic power/heating generator. The single- and double-layer wire-mesh catalysts are tested to verify their performance on CO conversions. Experimental results indicate that the double-layer wire-mesh Catalytic Combustor yields a higher CO conversion ratio (>90%) than that (
William C. Pfefferle - One of the best experts on this subject based on the ideXlab platform.
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Advanced technology Catalytic Combustor for high temperature ground power gas turbine applications
Catalysis Today, 1999Co-Authors: Shahrokh Etemad, Hasan Karim, Lance L. Smith, William C. PfefferleAbstract:We report results from a lean burn ultra-low emission Catalytic Combustor. In a sub-scale rig, atmospheric testing with methane demonstrated NOx
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advanced technology Catalytic Combustor for high temperature ground power gas turbine applications
Catalysis Today, 1999Co-Authors: Shahrokh Etemad, Hasan Karim, Lance Smith, William C. PfefferleAbstract:We report results from a lean burn ultra-low emission Catalytic Combustor. In a sub-scale rig, atmospheric testing with methane demonstrated NOx<3, CO<5, and UHC<1 ppm, with stable combustion at inlet temperatures of 400–500°C (750–1020°F) and Combustor discharge temperatures of 1150–1540°C (2100–2800°F). Catalyst temperatures were held well below metal substrate material limits, while Combustor discharge temperatures of up to 1540°C (2800°F) were achieved.
Hung Wei Hsu - One of the best experts on this subject based on the ideXlab platform.
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design of a novel hydrogen syngas Catalytic mesh Combustor
International Journal of Hydrogen Energy, 2009Co-Authors: Hung Wei Hsu, Yung Sheng Lien, Yei Chin ChaoAbstract:Abstract A small-scale wire-mesh Catalytic Combustor is developed and evaluated for hydrogen–syngas combustion in domestic power/heating generator. The single- and double-layer wire-mesh catalysts are tested to verify their performance on CO conversions. Experimental results indicate that the double-layer wire-mesh Catalytic Combustor yields a higher CO conversion ratio (>90%) than that (
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Design of a novel hydrogen–syngas Catalytic mesh Combustor
International Journal of Hydrogen Energy, 2009Co-Authors: Hung Wei Hsu, Yung Sheng Lien, Yei Chin ChaoAbstract:Abstract A small-scale wire-mesh Catalytic Combustor is developed and evaluated for hydrogen–syngas combustion in domestic power/heating generator. The single- and double-layer wire-mesh catalysts are tested to verify their performance on CO conversions. Experimental results indicate that the double-layer wire-mesh Catalytic Combustor yields a higher CO conversion ratio (>90%) than that (
Kook Young Ahn - One of the best experts on this subject based on the ideXlab platform.
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Development of a coupled reactor with a Catalytic Combustor and steam reformer for a 5kW solid oxide fuel cell system
Applied Energy, 2014Co-Authors: Sanggyu Kang, Sangmin Lee, Kanghun Lee, Kook Young AhnAbstract:Abstract The methane (CH4) conversion rate of a steam reformer can be increased by thermal integration with a Catalytic Combustor, called a coupled reactor. In the present study, a 5 kW coupled reactor has been developed based on a 1 kW coupled reactor in previous work. The geometric parameters of the space velocity, diameter and length of the coupled reactor selected from the 1 kW coupled reactor are tuned and applied to the design of the 5 kW coupled reactor. To confirm the scale-up strategy, the performance of 5 kW coupled reactor is experimentally investigated with variations of operating parameters such as the fuel utilization in the solid oxide fuel cell (SOFC) stack, the inlet temperature of the Catalytic Combustor, the excess air ratio of the Catalytic Combustor, and the steam to carbon ratio (SCR) in the steam reformer. The temperature distributions of coupled reactors are measured along the gas flow direction. The gas composition at the steam reformer outlet is measured to find the CH4 conversion rate of the coupled reactor. The maximum value of the CH4 conversion rate is approximately 93.4%, which means the proposed scale-up strategy can be utilized to develop a large-scale coupled reactor.
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The Scale Up Characteristics of a Catalytic Combustor With Flow Uniformity Analysis
Journal of Fuel Cell Science and Technology, 2013Co-Authors: Hyun-tak Woo, Sangmin Lee, Sanggyu Kang, Kanghun Lee, Jinwon Yun, Kook Young AhnAbstract:Catalytic Combustors are used as off-gas Combustors of molten carbonate fuel cells (MCFCs) because of their exhaust gas purity, geometric flexibility, and high combustion efficiency. In this study, a new design was investigated for possible application in internally reformed MCFC. The study started with performance analysis of a 5 kWe Combustor, which could be precisely conducted due to availability of experimental apparatus. A 5 kWe Combustor was used as a model Combustor, and it was experimentally analyzed in terms of flow uniformity, catalyst screening, and reaction characteristics. The results show that the flow uniformity is able to reduce the exhaust gas concentration because temperature uniformity decreases the possibility of fuel slippages in locally lower temperature zones. As the capacity of the Combustor is increased from 5 kWe to 25 kWe, the exhaust gas temperature at the same inlet condition as that of the 5 kWe Combustor increases due to lower heat loss. As a result, the catalyst screening process shows different results due to higher operating temperatures, but three of four catalysts provide proper quality. On the other hand, flow uniformity improves economic competitiveness of the Catalytic Combustor. When the volume loading of Catalytic monoliths was decreased, the performance was very similar to that of the original volume loading of Catalytic monoliths.
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Flow Uniformity of Catalytic Burner for Off-Gas Combustion of Molten Carbonate Fuel Cell
Journal of Fuel Cell Science and Technology, 2012Co-Authors: Sangmin Lee, Young Duk Lee, Kook Young Ahn, Jaeyoung HanAbstract:A Catalytic Combustor is a device to burn out the fuel by surface combustion that is used for the combustion of anode off-gas of molten carbonate fuel cell. By employing the Catalytic Combustor, the purified exhaust gas is able to be recirculated into the cathode channel for CO2 supply to improve thermal efficiency. The design of Catalytic Combustor depends on many parameters but the flow uniformity is particularly important during the emergency shut-down of fuel cell stack. Right before the temperature control of Catalytic Combustor is not yet activated, the Catalytic Combustor should burn out more than two times of rated amount of fuel flow rate. At the over-loaded condition, assurance of flow uniformity at the inlet of Catalytic Combustor can reduce the damage of Catalytic burner caused by local hot zone. In this study, the flow uniformity of the Catalytic Combustor is investigated in two steps such as preliminary step with model Combustor and main analysis step with practical 250 kW Catalytic Combustor. The 0.5 kW and 5 kW class Combustors are applied for preliminary step. In preliminary step, the model Combustor is used to determine supporting matters for the flow uniformity. Inlet direction of mixing chamber below the Catalytic Combustor is also examined in the preliminary step. In the main analysis step, flow uniformity of scale-up Combustor has been examined with selected supporting matter and inlet direction into mixing chamber. Geometric and operating parameters are investigated. In particular, the flow rate at off-design operating condition has been examined.Copyright © 2011 by ASME
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Flow Uniformity of Catalytic Burner for Off-Gas Combustion of Molten Carbonate Fuel Cell
ASME 2011 9th International Conference on Fuel Cell Science Engineering and Technology, 2011Co-Authors: Young Duk Lee, Kook Young Ahn, Sangmin LeeAbstract:A Catalytic Combustor is a device to burn out the fuel by surface combustion that is used for the combustion of anode off-gas of molten carbonate fuel cell. By employing the Catalytic Combustor, the purified exhaust gas is able to be recirculated into the cathode channel for CO2 supply to improve thermal efficiency. The design of Catalytic Combustor depends on many parameters but the flow uniformity is particularly important during the emergency shut-down of fuel cell stack. Right before the temperature control of Catalytic Combustor is not yet activated, the Catalytic Combustor should burn out more than two times of rated amount of fuel flow rate. At the over-loaded condition, assurance of flow uniformity at the inlet of Catalytic Combustor can reduce the damage of Catalytic burner caused by local hot zone. In this study, the flow uniformity of the Catalytic Combustor is investigated in two steps such as preliminary step with model Combustor and main analysis step with practical 250 kW Catalytic Combustor. The 0.5 kW and 5 kW class Combustors are applied for preliminary step. In preliminary step, the model Combustor is used to determine supporting matters for the flow uniformity. Inlet direction of mixing chamber below the Catalytic Combustor is also examined in the preliminary step. In the main analysis step, flow uniformity of scale-up Combustor has been examined with selected supporting matter and inlet direction into mixing chamber. Geometric and operating parameters are investigated. In particular, the flow rate at off-design operating condition has been examined.
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Development of a Catalytic Combustor for a stationary fuel cell power generation system
Renewable Energy, 2010Co-Authors: Dong Jin Hong, Young Duk Lee, Sangmin Lee, Kook Young AhnAbstract:The anode off-gas of high temperature stationary fuel cell stacks still includes fuel components such as hydrogen, carbon monoxide, and hydrocarbon due to the innate characteristics of the fuel cell operation. Even though the anode off-gas has fuel contents, the flammability is very limited due to the vapor concentration of the anode off-gas. A Catalytic Combustor is applied as an off-gas Combustor so as to utilize the waste energy of anode off-gas by stimulating a chemical reaction over selected operating conditions. Temperature and flow uniformity in the radial direction are very significant factors of the durability, because the Catalytic combustion is carried out on the surface of the catalyst site. On the other hand, the catalyst selection is also very important due to the composition of the anode off-gas. In this study, the flow uniformity is presented prior to a catalyst screening test. From the results of the screening test, where three commercially available catalysts are tested, KIMM-I and KIMM-II are selected as candidates for a Catalytic Combustor of anode off-gas.
Yi Zhang - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical study on the transition conditions and influencing factors of hetero homogeneous reaction for h2 air mixture in micro Catalytic Combustor
Applied Thermal Engineering, 2019Co-Authors: Jianfeng Pan, Nannan Miao, Wenming Yang, Zhenhua Pan, Yi ZhangAbstract:Abstract Premixed combustion of Hydrogen/Air in a rectangular micro-Catalytic Combustor was investigated experimentally and numerically. The distribution of OH radicals in the Combustor was observed by Plane Laser-Induced Fluorescence (PLIF). A method for determining the transition process of reaction types in the Combustor by measuring temperature variation was proposed. The effects of Combustor height and mixed gas flow rate on the transition characteristics of reaction type were analyzed and the results demonstrated that the reaction type would transform with the change of equivalence ratio between the coupled hetero-/homogeneous reaction (Catalytic and gas phase reaction) and the pure heterogeneous reaction (pure Catalytic reaction). The critical equivalence ratio from coupled hetero-/homogeneous reaction transforming into pure heterogeneous reaction is ФA. The critical equivalence ratio from pure heterogeneous reaction to coupled hetero-/homogeneous reaction is ФB. At different Combustor heights and mixed gas flow rates, ФA is always less than ФB. When the height of Combustor increases, the critical equivalence ratio ФA decreases while the critical equivalence ratio ФB increases. The critical equivalence ratios ФA and ФB both decrease with the increase of mixed gas flow rate. Heat loss on the Combustor outer wall has an important influence on the transformation of reaction type.
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Experimental and numerical study on the transition conditions and influencing factors of hetero-/homogeneous reaction for H2/Air mixture in micro Catalytic Combustor
Applied Thermal Engineering, 2019Co-Authors: Jianfeng Pan, Nannan Miao, Wenming Yang, Zhenhua Pan, Yi ZhangAbstract:Abstract Premixed combustion of Hydrogen/Air in a rectangular micro-Catalytic Combustor was investigated experimentally and numerically. The distribution of OH radicals in the Combustor was observed by Plane Laser-Induced Fluorescence (PLIF). A method for determining the transition process of reaction types in the Combustor by measuring temperature variation was proposed. The effects of Combustor height and mixed gas flow rate on the transition characteristics of reaction type were analyzed and the results demonstrated that the reaction type would transform with the change of equivalence ratio between the coupled hetero-/homogeneous reaction (Catalytic and gas phase reaction) and the pure heterogeneous reaction (pure Catalytic reaction). The critical equivalence ratio from coupled hetero-/homogeneous reaction transforming into pure heterogeneous reaction is ФA. The critical equivalence ratio from pure heterogeneous reaction to coupled hetero-/homogeneous reaction is ФB. At different Combustor heights and mixed gas flow rates, ФA is always less than ФB. When the height of Combustor increases, the critical equivalence ratio ФA decreases while the critical equivalence ratio ФB increases. The critical equivalence ratios ФA and ФB both decrease with the increase of mixed gas flow rate. Heat loss on the Combustor outer wall has an important influence on the transformation of reaction type.