Pyrolysis characteristics of metal ion-exchanged Shendong coal and its char gasification performance

被引：38

作者：

Yao, Qiuxiang ^{[1
,2
]}

Ma, Mingming ^{[2
]}

Liu, Yongqi ^{[2
]}

He, Lei ^{[2
]}

Sun, Ming ^{[2
]}

Ma, Xiaoxun ^{[2
]}

机构：

[1] Xijing Univ, Sch Sci, Xian Key Lab Adv Photo Elect Mat & Energy Convers, Xian 710123, Shaanxi, Peoples R China

[2] Northwest Univ, Chem Engn Res Ctr, Shaanxi Res Ctr Engn Technol Clean Coal Convers, Sch Chem Engn,Minist Educ Adv Use Technol Shanbei, Xian 710069, Shaanxi, Peoples R China

来源：

JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS | 2021年 / 155卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Coal pyrolysis; Metal ion exchange; Coal tar; Char gasification; TG-FTIR; ALKALINE-EARTH METALS; RANK COALS; TEMPERATURE; BIOMASS; REACTIVITY; KINETICS;

D O I：

10.1016/j.jaap.2021.105087

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The effects of ion-exchanged metal cations (Na+, K+, Ca2+, Mg2+, Co2+ and Ni2+) on the pyrolysis reactivity of Shendong demineralized coal (SD-coal) and the gasification performance of pyrolysis chars were investigated by Py-GC/MS, TG-FTIR, FBR (the fixed-bed reactor), FTIR, SEM, XRD and CO2 reactivity. The results show that the order of pyrolysis weight loss rates is SD-coal-Ni > SD-coal-Co > SD-coal-Mg > SD-coal-Na > SD-coal-Ca > SDcoal-K. The char yields decrease and the pyrolysis gas yields increase during the pyrolysis of metal ion-exchanged coals compared with those of SD-coal. Ion exchange of Co2+ and Ni2+ increases the coal tar yields, especially the yield of coal tar obtained from SD-coal-Co pyrolysis increases to 9.45 %. Ion exchange of alkali and alkaline earth metal cations is generally conducive to the formation of naphthalene and its derivatives in coal tar. The catalytic effect of these metal cations on coal pyrolysis is Na+ > K+ > Ni2+ > Ca2+ > Mg2+ > Co2+. The values of Lc and Nave in chars derived from metal ion-exchanged coal pyrolysis are reduced compared with SD-coal char. The effect of ion-exchanged metal cations on the gasification reactivity of chars is K+ > Na+ > Mg2+ > Co2+ > Ni2+. And on this basis, the mechanisms of metal ion-exchanged coal pyrolysis and char gasification are concluded.

引用

页数：11

共 44 条

[1] Determination of the acid distribution and total acidity of low-rank coals and coal-derived materials by an improved barium exchange technique [J].