WANG Ya, REN Qiangqiang

(1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China; 2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract: Fine ash of coal gasification from a circulating fluidized bed has high residual carbon content, and its reuse can effectively increase the efficiency of carbon conversion. So it is necessary to study the characteristics of the gasified fine ash. Ash fusion determinator, X-ray diffractometer, scanning electron microscope were used to study the influence of ferrous elements on the ash fusibility of gasified fine ash from the perspectives of mineral transformation and microstructure at high temperature under the reducing atmosphere. Mullite leads to a higher ash fusibility temperatures. The formation of lower melting temperature minerals, such as anorthite and hercynite and the occurrence of low temperature eutectic phenomenon, are the main reasons for the decrease of ash melting temperature after the addition of FeO. The microscopic results of ash under the scanning electron microscopy verify the diffraction results of XRD.

Keywords: circulating fluidized bed gasification; gasified fine ash; ash fusibility; ferrous oxide

中图分类号：TK01+9

文献标志码：A

收稿日期： 2018-11-15，修回日期:2018-12-01，在线出版时间：2019-01-08 10:44。

基金项目：国家重点研发计划项目，编号：2017YFB0602302。

第一作者简介：王娅(1993—)，女，硕士研究生，研究方向为洁净煤燃烧。E-mail：wangya@iet.cn。

通信作者简介：任强强(1983—)，男，博士，研究员，硕士生导师，研究方向为煤的高效清洁利用。E-mail：renqiangqiang@iet.cn。

文章编号：1008-5548(2019)03-0030-07

DOI:10.13732/j.issn.1008-5548.2019.03.006