摘要
以内蒙古锡林郭勒盟褐煤为原料,借助于煤热解制备出民用洁净低硫褐煤半焦,考察了热解温度、升温速率、恒温时间及煤粒粒径等工艺条件对所制备的褐煤半焦中总硫、有机硫及无机硫含量的影响。实验结果表明:在500~800℃热解温度范围内,褐煤半焦中总硫含量随着热解温度的增加呈现先减小后增加的趋势,热解温度为700℃时褐煤半焦中总硫质量分数达到最低值(0.98%);热解升温速率越慢,越有利于褐煤中硫的释放,升温速率为10℃/min时褐煤中硫释放程度最大(脱硫率为67%);热解恒温时间过短或过长都会影响煤中硫的脱除,最佳热解恒温时间为60min;随着煤粒粒径的增大,热解过程中传质阻力增加,不利于煤中硫的脱除,粒径≤0.2mm时褐煤半焦中硫含量最低。
Decreasing the content of sulfur in semi-coke applied in the civil fuel is of great significance to reduce the emission of pollutants from the combustion of coal-based fuel. The low-sulfur semi-coke as civil fuel was prepared from Inner Mongolia Xilin Gol lignite with the method of pyrolysis. The influences of different temperature, heating rate, holding time and particle size on total sulfur, organic sulfur and inorganic sulfur in semi-coke were investigated in order to obtain the optimum condition of low-sulfur semi-cokes as clean civil fuel. The experimental results show that, the total content of sulfur in lignite semi-coke decreases first and then increases with the increase of pyrolysis temperature in the range of 500~800 ℃, and the total content of sulfur in lignite semi-coke reaches the lowest value of 0.98% when the pyrolysis temperature is 700 ℃. The slower the heating rate for pyrolysis is, the more favorable the emission of sulfur, and when the heating rate is 10 ℃/min, the emission of sulfur in coal was the largest and the ratio of removing sulfur reaches 67%. It can affect the removal of sulfur in the coal that the holding time for pyrolysis is too short or too long;the optimal holding time for pyrolysis is 60 min. The larger the particle size of coal is, the higher the mass transfer resistance, which causes the secondary reaction and influences the removal of sulfur in coal;and the sulfur content in semi-coke is the lowest at particle size of ≤0.2 mm.
作者
马玉川
杨颂
陈丽丽
赵聪
刘守军
杜文广
上官炬
MA Yuchuan;YANG Song;CHEN Lili;ZHAO Cong;LIU Shoujun;DU Wenguang;SHANGGUAN Ju(Key Laboratory for Coal Science and Technology of Ministry of Education and Shanxi Province,Taiyuan 030024,China;College of Chemistry and Chemical Engineering, Taiyuan University of Technology,Taiyuan 030024,China)
出处
《太原理工大学学报》
CAS
北大核心
2019年第4期453-459,共7页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(21878210)
关键词
褐煤
热解
半焦
工艺条件
脱硫率
有机硫
无机硫
lignite
pyrolysis
semi-coke
process condition
desulfurization
organic sulfur
inorganic sulfur
