Thermodynamic assessment of hydrogen production via solar thermochemical cycle based on MoO
Jiahui JIN, Lei WANG, Mingkai FU, Xin LI, Yuanwei LU
《能源前沿(英文)》
2020年
第14卷
第1期
页码 71-80
doi:
10.1007/s11708-019-0652-9
摘要:
Inspired by the promising hydrogen production in the solar thermochemical (STC) cycle based on non-stoichiometric oxides and the operation temperature decreasing effect of methane reduction, a high-fuel-selectivity and CH -introduced solar thermochemical cycle based on MoO /Mo is studied. By performing HSC simulations, the energy upgradation and energy conversion potential under isothermal and non-isothermal operating conditions are compared. In the reduction step, MoO : CH = 2 and 1020 K< <1600 K are found to be most favorable for syngas selectivity and methane conversion. Compared to the STC cycle without CH , the introduction of methane yields a much higher hydrogen production, especially at the lower temperature range and atmospheric pressure. In the oxidation step, a moderately excessive water is beneficial for energy conversion whether in isothermal or non-isothermal operations, especially at H O: Mo= 4. In the whole STC cycle, the maximum non-isothermal and isothermal efficiency can reach 0.417 and 0.391 respectively. In addition, the predicted efficiency of the second cycle is also as high as 0.454 at = 1200 K and = 400 K, indicating that MoO could be a new and potential candidate for obtaining solar fuel by methane reduction.
关键词:
MoO2/Mo based on solar thermochemical cycle
methanothermal reduction
isothermal and non-isothermal operation
syngas and hydrogen production
thermodynamic analysis
Analysis of radiation heat transfer and temperature distributions of solar thermochemical reactor for
Bachirou GUENE LOUGOU, Yong SHUAI, Xiang CHEN, Yuan YUAN, Heping TAN, Huang XING
《能源前沿(英文)》
2017年
第11卷
第4期
页码 480-492
doi:
10.1007/s11708-017-0506-2
摘要:
This paper investigated radiation heat transfer and temperature distributions of solar thermochemical reactor for syngas production using the finite volume discrete ordinate method (fvDOM) and P1 approximation for radiation heat transfer. Different parameters including absorptivity, emissivity, reflection based radiation scattering, and carrier gas flow inlet velocity that would greatly affect the reactor thermal performance were sufficiently investigated. The fvDOM approximation was used to obtain the radiation intensity distribution along the reactor. The drop in the temperature resulted from the radiation scattering was further investigated using the P1 approximation. The results indicated that the reactor temperature difference between the P1 approximation and the fvDOM radiation model was very close under different operating conditions. However, a big temperature difference which increased with an increase in the radiation emissivity due to the thermal non-equilibrium was observed in the radiation inlet region. It was found that the incident radiation flux distribution had a strong impact on the temperature distribution throughout the reactor. This paper revealed that the temperature drop caused by the boundary radiation heat loss should not be neglected for the thermal performance analysis of solar thermochemical reactor.
关键词:
solar thermochemical reactor
incident radiation flux
temperature distribution
radiation absorptivity
radiation emissivity
thermal performance analysis
Piezocatalytic performance of FeO−BiMoO catalyst for dye degradation
《化学科学与工程前沿(英文)》
2023年
第17卷
第6期
页码 716-725
doi:
10.1007/s11705-022-2265-9
摘要:
A Fe2O3−Bi2MoO6 heterojunction was synthesized via a hydrothermal method. Scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray, powder X-ray diffraction, Fourier transform infrared spectroscopy and ultra-violet−visible near-infrared spectrometry were performed to measure the structures, morphologies and optical properties of the as-prepared samples. The various factors that affected the piezocatalytic property of composite catalyst were studied. The highest rhodamine B degradation rate of 96.6% was attained on the 3% Fe2O3−Bi2MoO6 composite catalyst under 60 min of ultrasonic vibration. The good piezocatalytic activity was ascribed to the formation of a hierarchical flower-shaped microsphere structure and the heterostructure between Fe2O3 and Bi2MoO6, which effectively separated the ultrasound-induced electron–hole pairs and suppressed their recombination. Furthermore, a potential piezoelectric catalytic dye degradation mechanism of the Fe2O3−Bi2MoO6 catalyst was proposed based on the band potential and quenching effect of radical scavengers. The results demonstrated the potential of using Fe2O3−Bi2MoO6 nanocomposites in piezocatalytic applications.
关键词:
piezocatalysis
Fe2O3−Bi2MoO6
dye decomposition
ultrasonic vibration
Review of the direct thermochemical conversion of lignocellulosic biomass for liquid fuels
Jianchun JIANG,Junming XU,Zhanqian SONG
《农业科学与工程前沿(英文)》
2015年
第2卷
第1期
页码 13-27
doi:
10.15302/J-FASE-2015050
摘要:
Increased demand for liquid transportation fuels, environmental concerns and depletion of petroleum resources requires the development of efficient conversion technologies for production of second-generation biofuels from non-food resources. Thermochemical approaches hold great potential for conversion of lignocellulosic biomass into liquid fuels. Direct thermochemical processes convert biomass into liquid fuels in one step using heat and catalysts and have many advantages over indirect and biological processes, such as greater feedstock flexibility, integrated conversion of whole biomass, and lower operation costs. Several direct thermochemical processes are employed in the production of liquid biofuels depending on the nature of the feedstock properties: such as fast pyrolysis/liquefaction of lignocellulosic biomass for bio-oil, including upgrading methods, such as catalytic cracking and hydrogenation. Owing to the substantial amount of liquid fuels consumed by vehicular transport, converting biomass into drop-in liquid fuels may reduce the dependence of the fuel market on petroleum-based fuel products. In this review, we also summarize recent progress in technologies for large-scale equipment for direct thermochemical conversion. We focus on the technical aspects critical to commercialization of the technologies for production of liquid fuels from biomass, including feedstock type, cracking catalysts, catalytic cracking mechanisms, catalytic reactors, and biofuel properties. We also discuss future prospects for direct thermochemical conversion in biorefineries for the production of high grade biofuels.
关键词:
lignocellulosic biomass
thermochemical
liquid fuels
upgrading
biofuels
SiO2 passivation layer grown by liquid phase deposition for silicon solar cell application
Yanlin CHEN,Sihua ZHONG,Miao TAN,Wenzhong SHEN
《能源前沿(英文)》
2017年
第11卷
第1期
页码 52-59
doi:
10.1007/s11708-016-0429-3
摘要:
Surface passivation is one of the primary requirements for high efficient silicon solar cells. Though the current existed passivation techniques are effective, expensive equipments are required. In this paper, a comprehensive understanding of the SiO passivation layer grown by liquid phase deposition (LPD) was presented, which was cost-effective and very simple. It was found that the post-annealing process could significantly enhance the passivation effect of the LPD SiO film. Besides, it was revealed that both chemical passivation and field-effect passivation mechanisms played important roles in outstanding passivation effect of the LPD SiO film through analyzing the minority carrier lifetime and the surface recombination velocity of n-type and p-type silicon wafers. Although the deposition parameters had little influence on the passivation effect, they affected the deposition rate. Therefore, appropriate deposition parameters should be carefully chosen based on the compromise of the deposition rate and fabrication cost. By utilizing the LPD SiO film as surface passivation layer, a 19.5%-efficient silicon solar cell on a large-scale wafer (156 mm × 156 mm) was fabricated.
关键词:
Si solar cell
passivation
SiO2
liquid phase deposition
carrier lifetime
Life cycle assessment and economic analysis of HFC-134a production from natural gas compared with oil-basedand coal-based production
《化学科学与工程前沿(英文)》
2022年
第16卷
第12期
页码 1713-1725
doi:
10.1007/s11705-022-2210-y
摘要:
China is the largest producer and consumer of HFC-134a (1,1,1,2-tetrafluoroethane) in the world. Coal-based route is mainly adopted to produce HFC-134a, which suffers from large waste and CO2 emissions. Natural gas is a low-carbon and clean energy resource, and no research has been found on the environment and economy of producing HFC-134a from natural gas. In this study, CML 2001 method was used to carry out the life cycle assessment of natural gas (partial oxidation)-based and natural gas (plasma cracking)-based routes (abbreviated as gas(O)-based and gas(P)-based routes, respectively), and their environmental performances were compared with coal-based and oil-based routes. Meanwhile, considering that China is vigorously promoting the transformation of energy structure, and the application of electric heating equipment to replace fossil-based heating equipment in industrial field, which has a great impact on the environmental performance of the production processes, the authors conducted a scenario analysis. The results showed that the gas(O)-based route had the most favourable environmental benefits. However, the gas(P)-based route had the highest potential for reducing environmental burdens, and its environmental benefit was the most favourable in scenario 2050. Additionally, the economic performance of the gas(P)-based route was significantly better than that of gas(O)-based and coal-based routes.
关键词:
life cycle assessment
economic performance
HFC-134a
natural gas
oil
coal
Liquid-based high-temperature receiver technologies for next-generation concentrating solar power: A
《能源前沿(英文)》
2023年
第17卷
第1期
页码 16-42
doi:
10.1007/s11708-023-0866-8
摘要:
To reduce the levelized cost of energy for concentrating solar power (CSP), the outlet temperature of the solar receiver needs to be higher than 700 °C in the next-generation CSP. Because of extensive engineering application experience, the liquid-based receiver is an attractive receiver technology for the next-generation CSP. This review is focused on four of the most promising liquid-based receivers, including chloride salts, sodium, lead-bismuth, and tin receivers. The challenges of these receivers and corresponding solutions are comprehensively reviewed and classified. It is concluded that combining salt purification and anti-corrosion receiver materials is promising to tackle the corrosion problems of chloride salts at high temperatures. In addition, reducing energy losses of the receiver from sources and during propagation is the most effective way to improve the receiver efficiency. Moreover, resolving the sodium fire risk and material compatibility issues could promote the potential application of liquid-metal receivers. Furthermore, using multiple heat transfer fluids in one system is also a promising way for the next-generation CSP. For example, the liquid sodium is used as the heat transfer fluid while the molten chloride salt is used as the storage medium. In the end, suggestions for future studies are proposed to bridge the research gaps for > 700 °C liquid-based receivers.
关键词:
next-generation concentrating solar power
liquid-based solar receiver
molten salt
liquid metals
标题
作者
时间
类型
操作
Thermodynamic assessment of hydrogen production via solar thermochemical cycle based on MoO
Jiahui JIN, Lei WANG, Mingkai FU, Xin LI, Yuanwei LU
期刊论文
Analysis of radiation heat transfer and temperature distributions of solar thermochemical reactor for
Bachirou GUENE LOUGOU, Yong SHUAI, Xiang CHEN, Yuan YUAN, Heping TAN, Huang XING
期刊论文
Revealing the GHG reduction potential of emerging biomass-based CO utilization with an iron cycle system
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Piezocatalytic performance of FeO−BiMoO catalyst for dye degradation
期刊论文
中国高温气冷堆制氢发展战略研究
张平,徐景明,石磊,张作义
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下一代太阳能光热电站中熔融氯盐技术研发进展
丁文进, Thomas Bauer
期刊论文
Review of the direct thermochemical conversion of lignocellulosic biomass for liquid fuels
Jianchun JIANG,Junming XU,Zhanqian SONG
期刊论文
SiO2 passivation layer grown by liquid phase deposition for silicon solar cell application
Yanlin CHEN,Sihua ZHONG,Miao TAN,Wenzhong SHEN
期刊论文
Life cycle assessment and economic analysis of HFC-134a production from natural gas compared with oil-basedand coal-based production
期刊论文
Liquid-based high-temperature receiver technologies for next-generation concentrating solar power: A
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Life cycle and performance based seismic design of major bridges in China
FAN Lichu
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太阳能技术对我国未来减排CO2 的贡献
赵玉文
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Photoreduction adjusted surface oxygen vacancy of BiMoO for boosting photocatalytic redox performance
期刊论文
Corrosion behavior of Fe–Cr–Ni based alloys exposed to molten MgCl2–KCl–NaCl salt with over-added
期刊论文
Thermochemical pretreatment of meat and bone
meal and its effect on methane production
Guangxue WU , Zhenhu HU , Mark G. HEALY , Xinmin ZHAN ,
期刊论文