The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Hui Hong - One of the best experts on this subject based on the ideXlab platform.
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Solar Hydrogen Production Integrating Low-Grade Solar Thermal Energy and Methanol Steam Reforming
Journal of Energy Resources Technology-transactions of The Asme, 2009Co-Authors: Hui HongAbstract:In this paper, a novel approach of middle-temperature Solar hydrogen production using methanol steam reforming is proposed. It can be carried out at around 200-300 degrees C, much lower than the temperatures of other Solar thermochemical hydrogen production. For the realization of the proposed Solar hydrogen production, Solar experiments are investigated in a modified 5 kW Solar receiver/reactor with one-tracking parabolic trough concentrators. The feature of significantly upgrading the Energy level from lower-grade Solar Thermal Energy to higher-grade chemical Energy is experimentally identified. The interaction between the hydrogen yield and the Energy-level upgrade of Solar Thermal Energy is clarified. Also, this kind of Solar hydrogen production is experimentally compared with methanol decomposition. The preliminarily economic evaluation of the hydrogen production is identified. As a result, in the Solar-driven steam reforming, the thermochemical efficiency of Solar Thermal Energy converted into chemical Energy reached up to 40-50% under a mean Solar flux of 550-700 W/m(2), and exceeding 90% of hydrogen production is achieved, with about 70% higher than that of methanol decomposition. The thermochemical performance of Solar-driven methanol steam reforming experimentally examined at around 200-300 degrees C for hydrogen production may be competitive with conventional methane reforming. The promising results obtained here indicate that the proposed Solar hydrogen production may provide the possibility of a synergetic process of both high production of hydrogen and effective utilization of Solar Thermal Energy at around 200-300 degrees C.
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experimental investigation of hydrogen production integrated methanol steam reforming with middle temperature Solar Thermal Energy
Applied Energy, 2009Co-Authors: Hui Hong, Jianli YuanAbstract:Developing a hydrogen production method that utilizes Solar Thermal Energy in an effective manner is a great challenge. In this paper we propose a new approach to Solar hydrogen production with the integration of methanol steam reforming and middle-temperature Solar Thermal Energy. An experiment on hydrogen production is conducted using a 5-kW Solar reactor at 150-300 °C under atmosphere pressure. The 5-kW Solar receiver/reactor is fabricated and positioned along the focal line of one-tracking parabolic trough concentrator. As a result, the chemical conversion of methanol can reach levels higher than 90%, and the volumetric concentration of hydrogen in the gas products can account for 66-74% above the Solar flux of 580 W/m2. The obtained maximum hydrogen yield per mole of methanol is 2.65-2.90 mol, approaching the theoretical maximum value, and the experimentally obtained thermochemical efficiency of Solar Thermal Energy converted into chemical Energy is in the range of 30-50%, which is competitive with other high-temperature Solar thermochemical processes. A kinetic model of Solar-driven methanol steam reforming related to Solar flux is also derived based on the experimental data. The promising results demonstrate that this Solar-driven hydrogen production method can be feasible in practical applications.
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Experimental investigation of hydrogen production integrated methanol steam reforming with middle-temperature Solar Thermal Energy
Applied Energy, 2009Co-Authors: Qibin Liu, Jianli Yuan, Hongguang Jin, Hui Hong, Ruixian CaiAbstract:Developing a hydrogen production method that utilizes Solar Thermal Energy in an effective manner is a great challenge. In this paper we propose a new approach to Solar hydrogen production with the integration of methanol steam reforming and middle-temperature Solar Thermal Energy. An experiment on hydrogen production is conducted using a 5-kW Solar reactor at 150-300 °C under atmosphere pressure. The 5-kW Solar receiver/reactor is fabricated and positioned along the focal line of one-tracking parabolic trough concentrator. As a result, the chemical conversion of methanol can reach levels higher than 90%, and the volumetric concentration of hydrogen in the gas products can account for 66-74% above the Solar flux of 580 W/m2. The obtained maximum hydrogen yield per mole of methanol is 2.65-2.90 mol, approaching the theoretical maximum value, and the experimentally obtained thermochemical efficiency of Solar Thermal Energy converted into chemical Energy is in the range of 30-50%, which is competitive with other high-temperature Solar thermochemical processes. A kinetic model of Solar-driven methanol steam reforming related to Solar flux is also derived based on the experimental data. The promising results demonstrate that this Solar-driven hydrogen production method can be feasible in practical applications. © 2008 Elsevier Ltd. All rights reserved.
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Mechanism of upgrading low-grade Solar Thermal Energy and experimental validation
Journal of Solar Energy Engineering-transactions of The Asme, 2008Co-Authors: Hui Hong, Jun JiAbstract:Solar thermochemical processes inherently included the conversion of Solar Thermal Energy into chemical Energy. In this paper a new mechanism of upgrading the Energy level of Solar Thermal Energy at around 200 degrees C was revealed based on the second law thermodynamics and was then experimentally proven. An expression was derived to describe the upgrading of the Energy level from low-grade Solar Thermal Energy to high-grade chemical Energy. The resulting equation explicitly reveals the interrelations of Energy levels between middle-temperature Solar Thermal Energy and methanol fuel, and identifies the interactions of mean Solar flux and the reactivity of methanol decomposition. The proposed mechanism was experimentally verified by using the fabricated 5 kW prototype of the receiver/reactor The agreement between the theoretical and the experimental results proves the validity of the mechanism for upgrading the Energy level of low-grade Solar Thermal Energy by integrating clean synthetic fuel. Moreover the application of this new middle-temperature Solar/methanol hybrid thermochemical process into a combined cycle is expected to have a net Solar-to-electric efficiency of about 27.8%, which is competitive with other Solar-hybrid Thermal power plants using high-temperature Solar Thermal Energy. The results obtained here indicate the possibility of utilizing Solar Thermal Energy at around 200 degrees C for electricity generation with high efficiency by upgrading the Energy level of Solar Thermal Energy, and provide an enhancement to Solar Thermal power plants with the development of this low-grade Solar thermochemical technology in the near future.
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A novel hybrid oxy-fuel power cycle utilizing Solar Thermal Energy
Energy, 2007Co-Authors: Hui HongAbstract:An advanced oxy-fuel hybrid power system (AHPS) is proposed in this paper. Solar Thermal Energy is used in the AHPS to produce saturated steam as the working fluid, and natural gas is internally combusted with pure oxygen. It is in configuration close to the zero emission Graz cycle. The thermodynamic characteristics at design conditions of the AHPS are analyzed using the advanced process simulator Aspen Plus. The corresponding exergy loss analyses are also carried out to gain understanding of the loss distribution. The results are given in detail. The Solar Thermal hybrid H2O turbine power generation system (STHS) is evaluated in this study as the reference. The comparison results demonstrate that the proposed cycle has notable advantages in thermodynamic performances. For example, the net fuel-to-electricity efficiency of the AHPS is 95.90%, which is 21.61 percentage points higher than that of the STHS. The exergy efficiency (based on the exergy input of fuel and Solar Thermal Energy without radiation) of the AHPS is 55.88%, which is 2.13 percentage points higher than that of the STHS.
Jun Ji - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation of methanol decomposition with mid- and low-temperature Solar Thermal Energy
2020Co-Authors: Jianguo Dang, Jun JiAbstract:Mid- and low-temperature Solar Thermal Energy can be transformed into chemical Energy of the syngas by the endothermic reaction of the methanol decomposition. This process can overcome the disadvantages such as the low Energy density, the intermission and the unequal distribution in the utilization of Solar Energy. In this study, a mid-and low-temperature Solar receiver/reactor prototype of 5 kW was fabricated, which was installed along the focal line of a one-axis parabolic trough concentrator. The integration principle of the Solar Thermal Energy and the thermochemical process for the Solar receiver/reactor was also proposed. The kinetic characteristics of the methanol decomposition and the Energy conversion in the mid- and low-temperature Solar thermochemical process were investigated. Some encouraging results, such as the methanol conversion could reach more than 90%, the H 2 selectivity is in the range of 50-99%, the mole concentration of syngas is about 35-95% and the efficiency of the Solar Thermal Energy converted into the chemical Energy approximates 60%, are obtained. As a result, the promising approach can be introduced for effectively utilizing the mid- and low-temperature Solar Thermal Energy by means of the Solar thermochemical process. Copyright © 2010 John Wiley & Sons, Ltd.
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Mechanism of upgrading low-grade Solar Thermal Energy and experimental validation
Journal of Solar Energy Engineering-transactions of The Asme, 2008Co-Authors: Hui Hong, Jun JiAbstract:Solar thermochemical processes inherently included the conversion of Solar Thermal Energy into chemical Energy. In this paper a new mechanism of upgrading the Energy level of Solar Thermal Energy at around 200 degrees C was revealed based on the second law thermodynamics and was then experimentally proven. An expression was derived to describe the upgrading of the Energy level from low-grade Solar Thermal Energy to high-grade chemical Energy. The resulting equation explicitly reveals the interrelations of Energy levels between middle-temperature Solar Thermal Energy and methanol fuel, and identifies the interactions of mean Solar flux and the reactivity of methanol decomposition. The proposed mechanism was experimentally verified by using the fabricated 5 kW prototype of the receiver/reactor The agreement between the theoretical and the experimental results proves the validity of the mechanism for upgrading the Energy level of low-grade Solar Thermal Energy by integrating clean synthetic fuel. Moreover the application of this new middle-temperature Solar/methanol hybrid thermochemical process into a combined cycle is expected to have a net Solar-to-electric efficiency of about 27.8%, which is competitive with other Solar-hybrid Thermal power plants using high-temperature Solar Thermal Energy. The results obtained here indicate the possibility of utilizing Solar Thermal Energy at around 200 degrees C for electricity generation with high efficiency by upgrading the Energy level of Solar Thermal Energy, and provide an enhancement to Solar Thermal power plants with the development of this low-grade Solar thermochemical technology in the near future.
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Solar Thermal power cycle with integration of methanol decomposition and middle-temperature Solar Thermal Energy
Solar Energy, 2005Co-Authors: Hui Hong, Hongguang Jin, Zhifeng Wang, Jun Ji, Ruixian CaiAbstract:In this paper, we have proposed a new Solar Thermal power cycle which integrates methanol decomposition and middle-temperature Solar Thermal Energy, and investigated its features based on the principle of the cascade utilization of chemical exergy. Also, the methanol decomposition with a catalyst was experimentally studied at temperatures of 150-300°C and under atmospheric pressure. The chemical Energy released by methanol fuel in this cycle consisted of two successive processes: Solar Energy drives the Thermal decomposition of methanol in a Solar receiver-reactor, and the syngas of resulting products is combusted with air, namely, indirect combustion after methanol decomposition. As a result, the net Solar-to-electric efficiency of the proposed cycle could be 35% at the collector temperature of 220°C and the turbine inlet temperature of 1300°C, and the exergy loss in the indirect combustion of methanol was about 7% points lower than that in the direct combustion of methanol. The promising results obtained in this study indicated that this new Solar Thermal power cycle could make significant improvements both in the efficient use of the chemical Energy of clean synthetic fuel and in the middle-temperature Solar Thermal Energy in a power system. © 2004 Elsevier Ltd. All rights reserved.
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Solar Thermal power cycle with integration of methanol decomposition and middle temperature Solar Thermal Energy
Solar Energy, 2005Co-Authors: Hui Hong, Jun Ji, Zhifeng WangAbstract:Abstract In this paper, we have proposed a new Solar Thermal power cycle which integrates methanol decomposition and middle-temperature Solar Thermal Energy, and investigated its features based on the principle of the cascade utilization of chemical exergy. Also, the methanol decomposition with a catalyst was experimentally studied at temperatures of 150–300 °C and under atmospheric pressure. The chemical Energy released by methanol fuel in this cycle consisted of two successive processes: Solar Energy drives the Thermal decomposition of methanol in a Solar receiver-reactor, and the syngas of resulting products is combusted with air, namely, indirect combustion after methanol decomposition. As a result, the net Solar-to-electric efficiency of the proposed cycle could be 35% at the collector temperature of 220 °C and the turbine inlet temperature of 1300 °C, and the exergy loss in the indirect combustion of methanol was about 7% points lower than that in the direct combustion of methanol. The promising results obtained in this study indicated that this new Solar Thermal power cycle could make significant improvements both in the efficient use of the chemical Energy of clean synthetic fuel and in the middle-temperature Solar Thermal Energy in a power system.
Ruixian Cai - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation of hydrogen production integrated methanol steam reforming with middle-temperature Solar Thermal Energy
Applied Energy, 2009Co-Authors: Qibin Liu, Jianli Yuan, Hongguang Jin, Hui Hong, Ruixian CaiAbstract:Developing a hydrogen production method that utilizes Solar Thermal Energy in an effective manner is a great challenge. In this paper we propose a new approach to Solar hydrogen production with the integration of methanol steam reforming and middle-temperature Solar Thermal Energy. An experiment on hydrogen production is conducted using a 5-kW Solar reactor at 150-300 °C under atmosphere pressure. The 5-kW Solar receiver/reactor is fabricated and positioned along the focal line of one-tracking parabolic trough concentrator. As a result, the chemical conversion of methanol can reach levels higher than 90%, and the volumetric concentration of hydrogen in the gas products can account for 66-74% above the Solar flux of 580 W/m2. The obtained maximum hydrogen yield per mole of methanol is 2.65-2.90 mol, approaching the theoretical maximum value, and the experimentally obtained thermochemical efficiency of Solar Thermal Energy converted into chemical Energy is in the range of 30-50%, which is competitive with other high-temperature Solar thermochemical processes. A kinetic model of Solar-driven methanol steam reforming related to Solar flux is also derived based on the experimental data. The promising results demonstrate that this Solar-driven hydrogen production method can be feasible in practical applications. © 2008 Elsevier Ltd. All rights reserved.
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Solar Thermal power cycle with integration of methanol decomposition and middle-temperature Solar Thermal Energy
Solar Energy, 2005Co-Authors: Hui Hong, Hongguang Jin, Zhifeng Wang, Jun Ji, Ruixian CaiAbstract:In this paper, we have proposed a new Solar Thermal power cycle which integrates methanol decomposition and middle-temperature Solar Thermal Energy, and investigated its features based on the principle of the cascade utilization of chemical exergy. Also, the methanol decomposition with a catalyst was experimentally studied at temperatures of 150-300°C and under atmospheric pressure. The chemical Energy released by methanol fuel in this cycle consisted of two successive processes: Solar Energy drives the Thermal decomposition of methanol in a Solar receiver-reactor, and the syngas of resulting products is combusted with air, namely, indirect combustion after methanol decomposition. As a result, the net Solar-to-electric efficiency of the proposed cycle could be 35% at the collector temperature of 220°C and the turbine inlet temperature of 1300°C, and the exergy loss in the indirect combustion of methanol was about 7% points lower than that in the direct combustion of methanol. The promising results obtained in this study indicated that this new Solar Thermal power cycle could make significant improvements both in the efficient use of the chemical Energy of clean synthetic fuel and in the middle-temperature Solar Thermal Energy in a power system. © 2004 Elsevier Ltd. All rights reserved.
T. X. Li - One of the best experts on this subject based on the ideXlab platform.
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A novel solid–gas thermochemical multilevel sorption Thermal battery for cascaded Solar Thermal Energy storage
Applied Energy, 2020Co-Authors: T. X. Li, J.x. Xu, S. Wu, R.z. WangAbstract:An innovative solid–gas thermochemical multilevel sorption Thermal battery is developed for cascaded Solar Thermal Energy storage to enhance the versatility and working reliability of Solar heat storage system by widening the working temperature range. Solar Thermal Energy can be stored in the form of bond Energy of sorption potential at different cascaded temperatures resulting from solid–gas thermochemical multilevel sorption processes. The operating principle and working performance of the thermochemical multilevel sorption Thermal battery for Energy storage is described and analyzed. Thermodynamic analysis showed that the proposed thermochemical multilevel sorption Thermal battery has the potential capacity for meeting the challenge of Solar heat storage during the random variation of low and high Solar insolation with time by using cascaded Thermal Energy storage technology. An Energy density higher than 1200kJ/kg of reactant can be attained from the advanced Energy storage system. The promising method can enhance the versatility and working reliability of Solar heat storage due to its distinct advantages of high Energy density and a wide range of Solar collection temperature when compared with conventional heat storage methods. It has potential applications for Energy management of renewable Energy utilization and waste heat recovery in large-scale industrial processes.
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A novel solid-gas thermochemical multilevel sorption Thermal battery for cascaded Solar Thermal Energy storage
Applied Energy, 2016Co-Authors: T. X. Li, J.x. Xu, T. Yan, S. Wu, R.z. WangAbstract:An innovative solid-gas thermochemical multilevel sorption Thermal battery is developed for cascaded Solar Thermal Energy storage to enhance the versatility and working reliability of Solar heat storage system by widening the working temperature range. Solar Thermal Energy can be stored in the form of bond Energy of sorption potential at different cascaded temperatures resulting from solid-gas thermochemical multilevel sorption processes. The operating principle and working performance of the thermochemical multilevel sorption Thermal battery for Energy storage is described and analyzed. Thermodynamic analysis showed that the proposed thermochemical multilevel sorption Thermal battery has the potential capacity for meeting the challenge of Solar heat storage during the random variation of low and high Solar insolation with time by using cascaded Thermal Energy storage technology. An Energy density higher than 1200. kJ/kg of reactant can be attained from the advanced Energy storage system. The promising method can enhance the versatility and working reliability of Solar heat storage due to its distinct advantages of high Energy density and a wide range of Solar collection temperature when compared with conventional heat storage methods. It has potential applications for Energy management of renewable Energy utilization and waste heat recovery in large-scale industrial processes.
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performance analysis of an integrated Energy storage and Energy upgrade thermochemical solid gas sorption system for seasonal storage of Solar Thermal Energy
Energy, 2013Co-Authors: T. X. Li, Jeremiah K. Kiplagat, R.z. Wang, Yong Tae KangAbstract:An innovative dual-mode thermochemical sorption Energy storage method is proposed for seasonal storage of Solar Thermal Energy with little heat losses. During the charging phase in summer, Solar Thermal Energy is stored in form of chemical bonds resulting from thermochemical decomposition process, which enables the stored Energy to be kept several months at ambient temperature. During the discharging phase in winter, the stored Thermal Energy is released in the form of chemical reaction heat resulting from thermochemical synthesis process. Thermodynamic analysis showed that the advanced dual-mode thermochemical sorption Energy storage is an effective method for the long-term seasonal storage of Solar Energy. A coefficient of performance (COPh) of 0.6 and Energy density higher than 1000 kJ/kg of salt can be attained from the proposed system. During the discharging phase at low ambient temperatures, the stored Thermal Energy can be upgraded by use of a solid–gas thermochemical sorption heat transformer cycle. The proposed thermochemical sorption Energy storage has distinct advantages over the conventional sensible heat and latent heat storage, such as higher Energy storage density, little heat losses, integrated Energy storage and Energy upgrade, and thus it can contribute to improve the seasonal utilization of Solar Thermal Energy.
R.z. Wang - One of the best experts on this subject based on the ideXlab platform.
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A novel solid–gas thermochemical multilevel sorption Thermal battery for cascaded Solar Thermal Energy storage
Applied Energy, 2020Co-Authors: T. X. Li, J.x. Xu, S. Wu, R.z. WangAbstract:An innovative solid–gas thermochemical multilevel sorption Thermal battery is developed for cascaded Solar Thermal Energy storage to enhance the versatility and working reliability of Solar heat storage system by widening the working temperature range. Solar Thermal Energy can be stored in the form of bond Energy of sorption potential at different cascaded temperatures resulting from solid–gas thermochemical multilevel sorption processes. The operating principle and working performance of the thermochemical multilevel sorption Thermal battery for Energy storage is described and analyzed. Thermodynamic analysis showed that the proposed thermochemical multilevel sorption Thermal battery has the potential capacity for meeting the challenge of Solar heat storage during the random variation of low and high Solar insolation with time by using cascaded Thermal Energy storage technology. An Energy density higher than 1200kJ/kg of reactant can be attained from the advanced Energy storage system. The promising method can enhance the versatility and working reliability of Solar heat storage due to its distinct advantages of high Energy density and a wide range of Solar collection temperature when compared with conventional heat storage methods. It has potential applications for Energy management of renewable Energy utilization and waste heat recovery in large-scale industrial processes.
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A novel solid-gas thermochemical multilevel sorption Thermal battery for cascaded Solar Thermal Energy storage
Applied Energy, 2016Co-Authors: T. X. Li, J.x. Xu, T. Yan, S. Wu, R.z. WangAbstract:An innovative solid-gas thermochemical multilevel sorption Thermal battery is developed for cascaded Solar Thermal Energy storage to enhance the versatility and working reliability of Solar heat storage system by widening the working temperature range. Solar Thermal Energy can be stored in the form of bond Energy of sorption potential at different cascaded temperatures resulting from solid-gas thermochemical multilevel sorption processes. The operating principle and working performance of the thermochemical multilevel sorption Thermal battery for Energy storage is described and analyzed. Thermodynamic analysis showed that the proposed thermochemical multilevel sorption Thermal battery has the potential capacity for meeting the challenge of Solar heat storage during the random variation of low and high Solar insolation with time by using cascaded Thermal Energy storage technology. An Energy density higher than 1200. kJ/kg of reactant can be attained from the advanced Energy storage system. The promising method can enhance the versatility and working reliability of Solar heat storage due to its distinct advantages of high Energy density and a wide range of Solar collection temperature when compared with conventional heat storage methods. It has potential applications for Energy management of renewable Energy utilization and waste heat recovery in large-scale industrial processes.
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performance analysis of an integrated Energy storage and Energy upgrade thermochemical solid gas sorption system for seasonal storage of Solar Thermal Energy
Energy, 2013Co-Authors: T. X. Li, Jeremiah K. Kiplagat, R.z. Wang, Yong Tae KangAbstract:An innovative dual-mode thermochemical sorption Energy storage method is proposed for seasonal storage of Solar Thermal Energy with little heat losses. During the charging phase in summer, Solar Thermal Energy is stored in form of chemical bonds resulting from thermochemical decomposition process, which enables the stored Energy to be kept several months at ambient temperature. During the discharging phase in winter, the stored Thermal Energy is released in the form of chemical reaction heat resulting from thermochemical synthesis process. Thermodynamic analysis showed that the advanced dual-mode thermochemical sorption Energy storage is an effective method for the long-term seasonal storage of Solar Energy. A coefficient of performance (COPh) of 0.6 and Energy density higher than 1000 kJ/kg of salt can be attained from the proposed system. During the discharging phase at low ambient temperatures, the stored Thermal Energy can be upgraded by use of a solid–gas thermochemical sorption heat transformer cycle. The proposed thermochemical sorption Energy storage has distinct advantages over the conventional sensible heat and latent heat storage, such as higher Energy storage density, little heat losses, integrated Energy storage and Energy upgrade, and thus it can contribute to improve the seasonal utilization of Solar Thermal Energy.