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不同含硫煤化学链燃烧过程中硫的迁移转化模拟研究

Simulation Study on Migration and Transformation of Sulfur in Process of Chemical-looping Combustion of Different Sulfur-bearing Coals
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摘要 利用HSC chemistry软件,研究了铁矿石为载氧体时煤直接化学链燃烧中煤中硫的迁移转化规律。模拟结果表明:对于中高硫煤以及高硫煤而言,当温度低于950℃时,煤中的硫会与CaO发生反应生成CaSO4。当温度高于950℃时,CaSO4进行高温分解生成SO2;而当硫含量较高时(如北宿煤),煤中的硫还会与载氧体中的Fe2O3发生反应生成FeSO4。通过对燃料过量系数的影响规律发现,燃料过量系数较小时反应生成的硫酸盐会对载氧体的性能产生一定的影响;而燃料过量系数较大时生成的SO2也会影响CO2的捕集。因此,在中高硫或高硫煤为燃料的直接化学链燃烧过程中,考虑到煤中的硫会对载氧体性能及CO2的捕集纯度造成的影响,需要添加脱硫剂进行控制。 HSC chemistry software was used to investigate the migration and transformation of sulfur in coal in the direct chemical-looping combustion process when using iron ore as an oxygen carrier.The simulation result shows that,when the temperature of the reaction is lower than 950℃,the sulfur contained in both of the medium-high sulfur and high sulfur coals reacts with CaO to produce CaSO4,while the CaSO4 will decompose and generate SO2 when the temperature is higher than 950℃.When the coal has a higher sulfur content,especially Beisu coal,the sulfur will also reacts with the Fe2 O3 in oxygen carrier to generate FeSO4.The fuel excess coefficient also has a significant effect on the process.The sulfate compounds will be generated when the fuel excess coefficient is small,which has a negative influence on the performance of the oxygen carrier;while SO2 will generate when the fuel excess coefficient is large,which will also affect the purity of CO2.Considering the effect of the sulfur in coal on the oxygen carrier and the purity of CO2,desulfurizer needs to be added in the coal direct chemicallooping combustion process when using the medium-high sulfur and even high sulfur coal as fuel.
作者 易旸 罗明 王超 王助良 杜敏 YI Yang;LUO Ming;WANG Chao;WANG Zhu-liang;DU Min(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China)
出处 《煤炭技术》 CAS 2019年第8期133-136,共4页 Coal Technology
基金 国家自然科学基金项目(51606087).
关键词 化学链燃烧 HSC CHEMISTRY coal chemical looping combustion sulfur HSC chemistry
作者简介 易旸(1994-),江苏镇江人,硕士研究生,研究方向:煤的化学链燃烧技术,电子信箱:yiyang@yahoo.com;通信作者:罗明,电子信箱:mingluo@ujs.edu.cn.
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