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Release Behavior of Sulfur during Fluidized Bed Gasification

Journal of Thermal Science 2021年第5期30卷 1731-1740页

作者： XIAN Shengxian ZHANG Haixia CHAI Zhen JIANG Denghao ZHU Zhiping Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

During fluidized bed gasification,sulfur in coal will be released,which will lead to environmental *** release behavior of sulfur in fluidized bed gasification has not been fully studied,although fluidized bed gasification technology has a promising *** the release behaviors of sulfur during fluidized bed gasification were investigated comprehensively through two aspects:temperature and reaction *** air gasification,the main gaseous sulfur is H_(2)S,followed by COS,and the yield of SO_(2)and CS_(2)is *** the increase of temperature,both of the released sulfur and the percentage of inorganic sulfur in gas phase *** the same working condition,the distributions of sulfur forms in gasification residues are *** sulfur is the dominate sulfur forms in the gasification *** in residues increases while organic sulfur decreases with increasing *** three reaction atmospheres(CO_(2)/steam/air)studied,the yield of H_(2)S is the most among the above four kinds of gaseous *** percentage of H_(2)S in gaseous sulfur(H_(2)S/Sg)is the highest in the process of steam gasification,while most sulfur is released during air *** sequencing of H_(2)/CO is the same as that of H_(2)S/Sg,while the trend of sulfur release rate is consistent with that of carbon conversion *** distributions of sulfur species in the fly ash of CO_(2)gasification and steam gasification are similar,while the sulfate content in the fly ash of air gasification is the highest.

关键词： released sulfur fluidized bed gasification temperature reaction atmosphere

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Preparation of high water-retaining biochar and its mechanism of alleviating drought stress in the soil and plant system

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Biochar 2021年第4期3卷 579-590页

作者： Hui Li Zhongxin Tan Hubei Key Laboratory of Soil Environment and Pollution Remediation Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River)Ministry of Agriculture and Rural AffairsCollege of Resources and EnvironmentHuazhong Agricultural UniversityNo.1 Lion Hill StreetHongshan DistrictWuhan 430070People’s Republic of China

To explore the effect of biochar on alleviating plant drought stress after being applied to soil,we prepared biochar using rice straw as raw material according to different pyrolysis temperatures(400,600 and 800°C)and reaction atmosphere(CO_(2)and N_(2)).The effect of different pyrolysis conditions on the water retention performance of biochar was *** early high water-retaining biochar materials were selected and wheat seeds were selected for the verification experiment of returning to the field in *** with high porosity(specific surface area and total pore volume)and more surface hydrophilic functional groups(mainly-OH and-COOH)can indeed improve soil water retention *** is mainly reflected in the increase in the dry weight and fresh weight of wheat and the soil moisture content in the treatment group with the addition of biochar water retention *** them,the growth rates of fresh weight and dry weight of wheat in the C800 treatment group were 11.51%and 10.64%,and the soil moisture content increased by 1.89%.It is worth noting that the application of biochar cannot completely alleviate the impact of drought stress on plants,but it can reduce the amount of water irrigation to a certain *** the quality of biochar,the biochar material(C800)prepared under the pyrolysis temperature of 800°C and the reaction atmosphere of CO_(2)has high water retention performance.

关键词： Biochar Pyrolysis temperature reaction atmosphere Water retention performance Drought stress

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