摘要
淮南煤煤灰熔融温度高导致其无法直接在气流床气化炉上使用,将淮南煤ZA煤分别与低灰熔融温度内蒙古煤ZB煤和ZC煤按照1∶9,2∶8,3∶7,4∶6,5∶5,6∶4,7∶3,8∶2,9∶1的质量比进行配煤,利用智能灰熔点测定仪(封碳法)对单煤及其配煤煤灰熔融温度进行测定,探究配煤比对煤灰熔融温度的影响,基于热力学平衡计算结果(利用FactSage 8.1软件计算)探讨了配煤煤灰熔融温度变化机理;利用热重分析仪(TGA)对单煤煤焦和配煤煤焦的CO_(2)气化反应性进行测定,并对反应动力学进行分析。结果表明:ZA煤灰在高温下生成莫来石是其熔融温度高的主要原因。ZA煤分别与ZB煤和ZC煤相配后,煤灰中莫来石含量降低,低熔点的钙长石、镁堇青石含量增加,使得配煤煤灰熔融温度降低。ZA煤焦、ZB煤焦和ZC煤焦三种煤焦的平均CO_(2)气化反应速率分别为2.54%/min,3.49%/min和4.19%/min,ZA煤焦与CO_(2)的气化反应最难发生,平均气化反应速率最小,ZC煤焦的CO_(2)气化反应最容易,平均反应速率最大。与单煤煤焦相比,配煤煤焦气化反应过程呈现先促进后抑制的作用。三种单煤煤焦CO_(2)气化反应活化能位于336.8 kJ/mol~405.0 kJ/mol之间,AB2(ZA煤与ZB煤的质量比为2∶8)煤焦和AC3(ZA煤与ZC煤的质量比为3∶7)煤焦的CO_(2)气化反应活化能与ZB煤焦的CO_(2)气化反应活化能和ZC煤焦的CO_(2)气化反应活化能基本一致,表明配煤降低了配煤煤焦中ZA煤焦的CO_(2)气化反应活化能。
Huainan coal ash cannot be directly used in an entrained-flow gasifier due to its high ash melting temperature.In this study,Huainan coal(ZA coal) was blended with two kinds of Inner Mongolia coal(ZB coal and ZC coal) with low ash melting temperature,respectively,to investigate the influence of coal blending on coal ash melting temperature.The blending ratio(mass ratio) was 1∶9,2∶8,3∶7,4∶6,5∶5,6∶4,7∶3,8∶2,9∶1,respectively.The ash melting temperatures of single coal and blending coal were determined using an ash melting temperature auto-analyzer in a weakly reducing atmosphere.The effect of coal blending on the ash fusibility was discussed based on the thermodynamic equilibrium calculation results(by FactSage).The CO_(2) gasification reactivity of char was measured using a thermogravimetric analyzer(TGA),and the reaction kinetics were analyzed.The results indicate that the high ash melting temperature of ZA coal is primarily due to the formation of mullite at high temperatures.When ZA coal is blended with ZB coal or ZC coal,the content of mullite decreases,while the content of low-melting-point minerals such as anorthite and magnesium cordierite increases,leading to a reduction in the ash melting temperature.The average CO_(2) gasification rates of ZA coal char,ZB coal char,and ZC coal char are 2.54%/min,3.49%/min,and 4.19%/min,respectively,indicating that ZA coal char has the lowest gasification reactivity with CO_2.While the ZC coal char has the highest average reaction rate,indicating that its gasification is easy to happen.Compared to the single coal,the gasification process of blended coal exhibits an initial promoting effect followed by an inhibitory effect.The activation energies for the CO_(2) gasification reactions of the three kinds of coal char range from 336.8 kJ/mol to 405.0 kJ/mol.The activation energies of AB2 coal(the mass ratio of ZA coal to ZB coal is 2∶8) char and AC3 coal(the mass ratio of ZA coal to ZB coal is 3∶7) char are consistent with those of ZB coal char and ZC coa
作者
刘国斌
张湘
陆启均
桂国阳
黄杰
李寒旭
焦发存
LIU Guobin;ZHANG Xiang;LU Qijun;GUI Guoyang;HUANG Jie;LI Hanxu;JIAO Facun(Company of Coal Sales,Huainan Coal Mining(Group)Company Limited,232001 Huainan,China;School of Chemical and Blasting Engineering,Anhui University of Science and Technology,232001 Huainan,China;Institute of Modern Coal Processing Technology of Anhui Province,Anhui University of Science and Technology,232001 Huainan,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2024年第4期68-78,共11页
Coal Conversion
基金
安徽省煤炭资源综合利用工程技术研究中心开放基金项目(MTYJZX202203)
安徽省科技重大专项项目(202003a07020022)。
关键词
淮南煤
配煤
热力学平衡计算
灰熔融温度
气化反应性
Huainan coal
blending coal
thermodynamic equilibrium calculation
ashmelting temperature
gasification reactivit
