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Effect of temperature fluctuation on hydrate-based CO_2 separation from fuel gas

Journal of Natural gas Chemistry 2011年第6期20卷 647-653页

作者： Xiaosen Li Chungang Xu Zhaoyang Chen Huijie Wu Jing Cai Key Laboratory of Renewable Energy and gas Hydrate Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 Guangdong China Guangzhou Center for gas Hydrate Research Chinese Academy of Sciences Guangzhou 510640 Guangdong China Graduate University of Chinese Academy of Sciences Beijing 100083 China

A new method of temperature fluctuation is proposed to promote the process of hydrate-based CO2 separation from fuel gas in this work according to the dual nature of CO2 solubility in hydrate forming and non-hydrate forming regions [1].The temperature fluctuation operated in the process of hydrate formation improves the formation of gas hydrate *** amount of the gas consumed with temperature fluctuation is approximately 35% more than that without temperature *** is found that only the temperature fluctuation operated in the period of forming hydrate leads to a good effect on CO2 ***,with the proceeding of hydrate formation,the effect of temperature fluctuation on the gas hydrate gradually reduces,and little effect is left in the completion *** CO2 separation efficiencies in the separation processes with the effective temperature fluctuations are improved remarkably.

关键词： gas hydrate CO2 fuel gas temperature fluctuation

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Process conditions for preparing methanol from cornstalk gas

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Journal of Environmental Sciences 2007年第5期19卷 628-632页

作者： ZHU Ling-feng DU Lei LI Xin-bao LI Guo-ting ZHANG Jie Department of Environmental Engineering North China Institute of Water Conservancy and Hydroelectric Power Zhengzhou 450011 China

The low-heat-value cornstalk gas produced in the down-flow fixed bed gasifier was tentatively used for methanol synthesis. The cornstalk gas was purified and the technical procedures such as deoxygenation, desulfurization, catalytic cracking of tar, purification and hydrogenation were studied. The catalytic experiments of methanol synthesis with cornstalk syngas were carried out in a tubular-flow integral and isothermal reactor. The effect of reaction temperature, pressure, catalysttypes, catalyst particle size, syngas flow at entering end and composition of syngas was investigated. The optimum process conditions and yield of methanol from cornstalk syngas were obtained. The experimental results indicated that the proper catalyst of the synthetic reaction was C301 and the optimum catalyst size （φ） was 0.833 mm×0.351 mm. The optimum operating temperature and pressure were found to be 235℃ and 5 Mpa, respectively. The suitable syngas flow 0.9-1.10 mol/h at entering end was selected and the best composition of syngas were CO 10.49%, CO2 8.8%, N2 37.32%, CnHm 0.95% and H2 40.49%. The best methanol yield is 0.418 g/g cornstalk. The study provided the technical support for the industrial test of methanol production from biomass （cornstalk）gas.

关键词： cornstalk syngas fuel gas purification catalyst methanol synthesis

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Thermodynamic Calculation of Equilibrium between Carbon,FeO-containing Slag and CO-CO2-H2O gas

Thermodynamic Calculation of Equilibrium between Carbon,FeO-...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Wu Yan Matsuura Hiroyuki Yuan Zhangfu Tsukihashi Fumitaka College of Engineering Peking University Graduate School of Frontier Sciences The University of Tokyo

High temperature slags could act as not only heat carrier and catalyst but also reactants in some chemical reactions to produce syngas due to the individual components in slags. A new method is put forward to utilize the thermal energy of converter slag and generate CO and H gases which could be reused as energy. Thermodynamics of the reaction between carbon, FeO-CaO-SiO slag and CO-CO-HO gas was studied by thermodynamic calculation and the effects of slag composition, slag temperature and added carbon amount on the behavior of the production of H and CO gases were clarified.

关键词： FeO-containing slag steam fuel gas carbon thermodynamic calculation

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