Behavior Characteristics of Ion-exchangeable Ca During Zhundong Coal Pyrolysis and Its Effects on Char Reactivity

被引：0

作者：

Du C. ^{[1
]}

Liu L. ^{[1
]}

Qiu P. ^{[1
]}

Sun J. ^{[1
]}

机构：

[1] School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, Heilongjiang Province

来源：

| 2018年 / Chinese Society for Electrical Engineering卷 / 38期

基金：

中国国家自然科学基金;

关键词：

Catalysis; Char; Ion-exchangeable Ca; Pyrolysis; Reactivity; Zhundong coal;

D O I：

10.13334/j.0258-8013.pcsee.162382

中图分类号：

学科分类号：

摘要：

Ion-exchangeable Ca species are considered as the main in-situ catalyst in Zhundong Coal. In this study, based on the behavior characteristics including the migration, the evolutions of char structure and the occurrence mode of Ca, the behavior of ion-exchangeable Ca species and its effects on the char reactivity were systematically studied, combining with the profiles of the char reactivity. The results indicated that the volatilization of ion-exchangeable Ca species gradually raised with the increase of temperature. The concentration of Ca species in char increased with increasing temperature, which was not corresponding to the char reactivity. The effects of Ca dispersion on the char reactivity should be taken into account. The Raman spectra of char showed Ca species would improve the structural characteristics of char at 600~700℃ temperature range, resulting in the further promotion of char reactivity. However, the char structure was affected slightly by Ca species at 800~1000℃ pyrolysis temperature range. Comparing the reactivity and Ca content between the Ca-Char and the resultant chars after chemical leaching proved that the ion-exchangeable Ca species were mainly transferred into one occurrence speciation that was stable and catalytic. The experimental results in this study would be helpful to provide important bases for the subsequent research of catalytic gasification. © 2018 Chin. Soc. for Elec. Eng.

引用

页码：204 / 211

页数：7

共 34 条

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