The Experts below are selected from a list of 111570 Experts worldwide ranked by ideXlab platform
James W Heffel - One of the best experts on this subject based on the ideXlab platform.
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nox emission reduction in a hydrogen Fueled internal combustion engine at 3000 rpm using exhaust gas recirculation
International Journal of Hydrogen Energy, 2003Co-Authors: James W HeffelAbstract:Abstract This paper describes five experiments conducted on a 2-l, 4-cylinder Ford ZETEC internal combustion engine (ICE) developed to operate on hydrogen Fuel. The experiments were conducted to ascertain the effect exhaust gas recirculation (EGR) and a standard 3-way catalytic converter had on NOx emissions and engine performance. All the experiments were conducted at a constant engine speed of 3000 rpm and each experiment used a different Fuel Flow rate, ranging from 1.63 to 2.72 kg/h . These Fuel Flow rates correspond to a Fuel equivalence ratio, Φ, ranging from 0.35 to 0.75 when the engine is operated without using EGR (i.e. using excess air for dilution). The experiments initially started with the engine operating using excess air. As the experiments proceed, the excess air was replaced with exhaust gas until the engine was operating at a stoichiometric air/Fuel ratio. The results of these experiments demonstrated that using EGR is an effective means to lowering NOx emissions to less than 1 ppm while also increasing engine output torque.
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nox emission and performance data for a hydrogen Fueled internal combustion engine at 1500 rpm using exhaust gas recirculation
International Journal of Hydrogen Energy, 2003Co-Authors: James W HeffelAbstract:Abstract This paper describes six experiments conducted on a 2-liter, 4-cylinder Ford ZETEC internal combustion engine developed to operate on hydrogen Fuel. The experiments were conducted to ascertain the effect exhaust gas recirculation (EGR) and a standard 3-way catalytic converter had on NOx emissions and engine performance. All the experiments were conducted at a constant engine speed of 1500 rpm and each experiment used a different Fuel Flow rate, ranging from 0.78 to 1.63 kg / h . These Fuel Flow rates correspond to a Fuel equivalence ratio, Φ, ranging from 0.35 to 1.02 when the engine is operated without using EGR (i.e. using excess air for dilution). The experiments initially started with the engine operating using excess air. As the experiments proceed, the excess air was replaced with exhaust gas until the engine was operating at a stoichiometric air/Fuel ratio. The results of these experiments demonstrated that using EGR is an effective means to lowering NOx emissions to less than 1 ppm while also increasing engine output torque.
Y Tian - One of the best experts on this subject based on the ideXlab platform.
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modelling of simple hybrid solid oxide Fuel cell and gas turbine power plant
Journal of Power Sources, 2002Co-Authors: S H Chan, Y TianAbstract:Abstract This paper presents the work on a simple, natural gas-fed, hybrid solid oxide Fuel cell–gas turbine (SOFC–GT) power-generation system. The system consists of an internal-reforming SOFC (IRSOFC) stack, a combustor, a GT, two compressors and three recuperators. Two case studies are conducted with particular attention on the effects of operating pressure and Fuel Flow-rate on the performance of the components and overall system. Results show that an internal-reforming hybrid SOFC–GT system can achieve an electrical efficiency of more than 60% and a system efficiency (including waste heat recovery for co-generation) of more than 80%. It is also found that increasing the operating pressure will improve the system efficiency, whereas increasing the Fuel Flow-rate (while keeping the Fuel utilisation rate unchanged) causes the system efficiency to decrease. In the latter case, the increase in system Fuel consumption is relatively higher which removes the benefit of increase in SOFC stack and turbine power output.
V N Gaitonde - One of the best experts on this subject based on the ideXlab platform.
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effect of hydrogen Fuel Flow rate Fuel injection timing and exhaust gas recirculation on the performance of dual Fuel engine powered with renewable Fuels
Renewable Energy, 2018Co-Authors: S V Khandal, N R Banapurmath, V N GaitondeAbstract:Abstract The current experimental study is an effort to reduce the engine out emissions from compression ignition (CI) engines powered by a combination of renewable liquid and gaseous Fuels. Hydrogen (H2) is a clean burning Fuel and seems a very popular gaseous Fuel for CI engine applications as it can replace large amount of liquid-injected pilot Fuels in dual Fuel (DF) engines. The study investigates the effect of hydrogen Fuel Flow rate (HFFR) along with honge biodiesel (BHO) or cotton seed biodiesel (BCO), Fuel injection timing (IT) and exhaust gas recirculation (EGR) on engine performance, engine out emissions and combustion of a DF engine. In the first part the maximum possible HFFR was obtained for smooth operation of DF engine. In the second part the liquid Fuel IT for better brake thermal efficiency (BTE) was obtained. In the third part the effect of EGR on the performance of DF engine was studied. The study showed that the maximum possible HFFR was 0.22 kg/h with a knock free operation. The Fuel IT of 27° before top dead center (bTDC) at a Fuel injection pressure (IP) of 240 bar yielded better results. When EGR of 15% was inducted, 23–24% lower BTE, 22–28% higher smoke, 38–40% higher hydrocarbon (HC), 31–38% higher carbon monoxide (CO) were noticed with biodiesel Fuels (BDFs) at optimum operating conditions for 80% load. But the oxides of nitrogen (NOx) emissions from the engine decreased by 26–28% with BDFs at optimum operating conditions for 80% load as compared to the CI mode.
Qinghua Zeng - One of the best experts on this subject based on the ideXlab platform.
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counter rotating dual stage swirling combustion characteristics of hydrogen and carbon monoxide at constant Fuel Flow rate
International Journal of Hydrogen Energy, 2020Co-Authors: Qinghua Zeng, Dong Zheng, Yixiang YuanAbstract:Abstract In this paper, experimental and numerical methods were used to study the combustion characteristics of a counter-rotating double-stage swirling syngas combustor at constant Fuel Flow rate, and the effect on it of hydrogen content of syngas. In the experiment, the speed and temperature in the combustor were respectively obtained with PIV and temperature rake, while Reynolds stress equation model and the detailed chemical reaction mechanism of syngas were adopted in the numerical method. The calculation results were in good agreement with the experimental data. Research results indicated that in the working conditions of different hydrogen contents, the Flow field structures in the combustor are almost the same, and the maximum temperatures at the outlet remain almost the same. However, as hydrogen content in the Fuel increases, the axial velocity in the central area of Flow field is increasing, and the outlet temperature distribution coefficient decreases first and then increases. In addition, it was also found in the study that the distribution structure of temperature on the central section of the combustor is almost impervious to the changes in hydrogen content, but with numerical differences, i.e. the higher hydrogen content in the Fuel, the farther the stabilization position of flames in the central area is away from the head. It was also indicated in the study that the conventional combustor is no longer applicable to the combustion of syngas, especially the hydrogen-rich Fuel. And the work provided the improvement scheme of hydrogen-containing Fuel for gas turbine combustor.
K C Leong - One of the best experts on this subject based on the ideXlab platform.
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numerical study of an internal reforming solid oxide Fuel cell and adsorption chiller co generation system
Journal of Power Sources, 2006Co-Authors: Y Liu, K C LeongAbstract:A study is conducted on a cogeneration system that incorporates a natural gas fed internal-reforming solid oxide Fuel cell (IRSOFC) and a zeolite/water adsorption chiller (AC). The main aim is to investigate the performance of this combined system under different operating conditions and design parameters. A mathematical model is developed to simulate the combined system under steady-state conditions. The effects of Fuel Flow rate, Fuel utilization factor, circulation ratio, mass of adsorbent and inlet air temperature on the performance are considered. The results show that the proposed IRSOFC-AC cogeneration system can achieve a total efficiency (combined electrical power and cooling power) of more than 77%. The electrical efficiency is found to decrease as the Fuel Flow rate increases, while the cooling power increases to a constant value. The total efficiency reaches a maximum value with variation of the Fuel utilization factor. Both the circulation ratio and the inlet air temperature exert positive impacts on system efficiency.
