Structural characterization of char during co-gasification from torrefied sludge and Yangchangwan bituminous coal  

作　　者：Xinsha Zhang Yonghui Bai Jie Qin Shengli Shi Jiazhong Liu Shuaibing Wang Minhui Zhao Guiming Shi Changbing Ye Guangsuo Yu 

机构地区：[1]Yuxi Normal University,Yuxi,Yunnan,653100,China [2]State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan,750021,China [3]Institute of Clean Coal Technology,East China University of Science and Technology,Shanghai,200237,China

出　　处：《International Journal of Coal Science & Technology》2023年第5期12-20,共9页国际煤炭科学技术学报（英文）

基　　金：supported by the Scientific Research Fund Project of Yunnan Provincial Department of Education(2022J0756);the National Natural Science Foundation of China(32260321,21968024).

摘　　要：The present study aims to investigate the physico-chemical structural evolution characteristics of char structure of CO_(2) atmosphere torrefaction pretreated sludge with Yangchangwan bituminous coal(YC)during co-gasification.The co-gasification reactivity of torrefied sludge and YC was measured using a thermogravimetric analyzer.The co-gasification reactivity of torrefied sludge with YC was thoroughly explored in depth by in situ heating stage microscope coupled with traditional characterization means of char sample(Scanning electron microscope,nitrogen adsorption analyzer,laser Raman spectroscopy).The results show that the gasification reaction rate of sludge treated under CO_(2) atmosphere and coal blended char was better than other char samples at 1100–1200℃.The torrefied sludge under CO_(2) atmosphere promoted its thermal decomposition to the maximum extent,so that it eventually was transformed into a large number of small broken particles.The specific surface area and ID1/IG ratio of blended char of torrefied sludge under CO_(2) atmosphere and YC were 1.70 and 1.07 times higher than that of YC,respectively.The in situ technique revealed that YC char with the addition of torrefied sludge undergo gasification by shrinking core modes and the presence of obvious ash melting flow phenomenon.It was more obvious than that of YC.

关 键 词：Characteristic-Char structure TORREFACTION CO-GASIFICATION 

分 类 号：X70[环境科学与工程—环境工程]