煤直接液化残渣与神东煤共热解特性研究

Study on co-pyrolysis characteristics of liquefaction residue andShendong coal

实验选用500 g级基于热重系统热解装置研究了神华液化残渣与神东煤共热解特性。结果表明,在反应器侧壁温度为200~600℃区间内,同一时刻,随着液化残渣配比的增加,热解胶质层比例增加,热解过程中传热加剧,煤样中心温度逐渐升高;液化残渣配比为20%时,煤样中心温度最高。液化残渣配比由0%增加至25%时,热解总失重量逐渐减小,焦油收率逐渐升高,热解特性趋好。当液化残渣比例由10%增加至25%时,半焦粘结加剧,3~6 mm粒级产率由51.99%降至34.03%,大于6 mm粒级占比由39.82%增加到57.06%;当液化残渣配比达到20%时,有一半以上的半焦粒度增加。

As the characteristics of temperature gradient in the heat transfer of materials in pyrolysis industrial plant,in the experiment,the 500g class pyrolysis device based on the thermogravimetric system is selected to study the co-pyrolysis characteristics of Shenhua liquefaction residue(DCLR)and Shendong coal(SDC).The results show that when the temperature of the reactor side wall is within the range of 200~600℃,at the same time,as the DCLR ratio increases,the proportion of pyrolyzed colloidal layer increases,heat transfer intensifies during the pyrolysis process,and the core temperature of the sample gradually rises;the core temperature of the sample is the highest when the DCLR ratio is 20%.When the DCLR ratio increases from 0%to 25%,the total pyrolysis weight loss decreases,the tar yield gradually increases,and the pyrolysis characteristics become better.When the DCLR ratio increases from 10%to 25%,char adhesion is intensified,the particle size of 3~6 mm is reduced from 51.99%to 34.03%,the ratio of particle size greater than 6mm increase from 39.82%to 57.06%;when the DCLR ratio is 20%,more than half of the char particle size increases.