宁东煤灰层/熔渣界面煤焦气化反应特性原位研究  

In-situ study of Ningdong char particles gasification characteristics on the interface of ash layer and slag

作　　者：张林民 王焦飞 白永辉 苏暐光[1] 宋旭东 于广锁 ZHANG Lin-min;WANG Jiao-fei;BAI Yong-hui;SU Wei-guang;SONG Xu-dong;YU Guang-suo(State Key Laboratory of High-Efficiency Coal Utilization and Green Chemical Engineering,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China;Institute of Clean Coal Technology,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]宁夏大学省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021 [2]华东理工大学洁净煤技术研究所,上海200237

出　　处：《燃料化学学报》2020年第2期129-136,I0001,共9页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21968024);宁夏回族自治区重点研发计划重大项目(2019BCH01001)资助。

摘　　要：以典型宁东煤-羊场湾煤为气化原料,采用热重分析仪和高温热台显微镜原位研究了1100、1200、1300℃下煤焦颗粒及其在灰层界面和熔渣界面的气化反应。结果表明,不同气化温度下灰层界面和熔渣界面的形态变化是影响煤焦颗粒气化反应性的主要因素。气化温度为1100℃,灰层在高温下收缩并包裹在煤焦颗粒表面,阻碍气化剂与煤焦颗粒的接触,使煤焦颗粒气化反应速率降低,而熔渣界面未发生明显变化,其界面处煤焦气化反应速率不变。气化温度为1300℃,灰层界面与熔渣界面均转变为液态,在表面张力作用下煤焦颗粒破碎,有效反应面积变大,传热速率增大,进而提高了煤焦的气化反应速率。A thermogravimetric analyzer and in-situ heating microscope were used to study gasification reaction of coal char particles on the interface of ash layer and slag at 1100,1200 and 1300℃,using typical Ningdong coal-Yangchangwan coal as gasification raw material.The results show that the shape change of ash layer interface and slag interface under different gasification temperature is the main factor that affects the gasification reactivity of coal char particles.When the gasification temperature is 1100℃,the ash layer shrinks and wraps on the surface of coal char particles at high temperature,preventing the contact between gasifying agent and coal char particles and reducing the gasification reaction of char particle.However,the interface of slag does not change significantly,and the gasification reaction rate of coal char on the slag interface remains unchanged.When the gasification temperature is 1300℃,the interface of both ash layer and slag turns into a liquid phase.Under the surface tension,the char particles are broken,the effective reaction area became larger,and the heat transfer rate increases,thereby increasing gasification reaction rate of the coal char.

关 键 词：渣层界面 灰层界面 原位观察 气化反应活性 

分 类 号：TQ54[化学工程—煤化学工程]