摘要
生物质协助低阶粉煤微波热解可改善热解产物的分布和特性,尤其是油气收率和品质。采用四因素四水平正交实验法研究了微波功率(420 W,280 W,700 W,560 W)、热解时间(30min,20min,10min,40min)、玉米芯粒径(0.250mm~0.420mm,0.177mm~0.250mm,0.841mm~1.680mm,0.420mm~0.841mm)和玉米芯添加量(10%,40%,30%,20%,质量分数)对低阶粉煤与玉米芯微波共热解中焦油收率的影响,对比分析了低阶粉煤、玉米芯单独微波热解和微波共热解的升温特性和产物特性。结果表明:影响焦油收率由主到次的因素分别为玉米芯添加量、微波功率、玉米芯粒径、热解时间。在本实验参数范围内,正交实验得到的最佳工艺条件为:微波功率700W、热解时间40min、玉米芯粒径0.841mm~1.68mm、玉米芯添加量40%,此时的半焦和气体产物收率分别为51.22%和32.17%,焦油收率达到最大,为8.85%。与低阶粉煤单独微波热解相比,微波共热解生成的焦油中轻油含量提高了11.89%,而杂原子化合物含量降低了7.09%,实现了热解焦油的轻质化和高品质化。
The distribution and characteristics of pyrolysis products can be improved through biomass-assisted microwave pyrolysis of low-rank pulverized coal,especially in terms of the yield and quality of oil-gas products.In this paper,the effects of microwave power(420W,280W,700W,560W),pyrolysis time(30min,70min,10min,40min),corncob particle size(0.250mm-0.420mm,0.177mm-0.250mm,0.841mm-1.680mm,0.420mm-0.841mm)and corncob addition(10%,40%,30%,20%,mass fraction)on tar yield of co-pyrolysis of lowrank pulverized coal and corncob in microwave were studied by orthogonal experiment.The heating characteristics and product characteristics of low-rank pulverized coal and corncob pyrolysis in microwave and co-pyrolysis in microwave were comparatively analyzed.The results show that the main factors affecting tar yield are corncob addition,microwave power,corncob particle size and pyrolysis time in order.The optimum experimental conditions within the experimental range were obtained by orthogonal test,which are 700 Wof microwave power,40min of pyrolysis time,0.841mm-1.680mm of corncob particle size,40%of corncob addition.Under the optimum conditions,the semi-char and gaseous yield are 51.22%and 32.17%,respectively,and the tar yield reaches the maximum of 8.85%.Compared with the pyrolysis of low-rank pulverized coal in microwave,the content of light oil in the tar from co-pyrolysis in microwave increases by 11.89%,while the content of heteroatom compounds in tar decreases by 7.09%,which means the quality of the tar is significantly improved.
作者
徐攀
关一宁
吴雷
周军
周晶晶
XU Pan;GUAN Yining;WU Lei;ZHOU Jun;ZHOU Jingjing(School of Chemistry and Chemical Engineering,Xi’an University of Architecture and Technology,710055 Xi’an,China;Key Laboratory of Green Development and Utilization of Nonferrous Resources of Shaanxi Province,710055 Xi’an,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2022年第2期21-30,共10页
Coal Conversion
基金
陕西省自然科学基础研究计划企业联合基金项目(2019JLP-17)
陕西省创新能力支撑计划项目(2020TD-028)
榆林市科技计划项目(CXY-2020-058)
碑林区科技计划项目(GX2133).
关键词
微波共热解
焦油
低阶粉煤
玉米芯
正交实验
co-pyrolysis in microwave
tar
low-rank pulverized coal
corncob
orthogonal test
作者简介
第一作者:徐攀,硕士生,E-mail:841178101@qq.com;通信作者:周军,教授、博士生导师,E-mail:xazhoujun@126.com。
