文献类型：期刊文献

英文题名：Viscosity fluctuation behaviors of coal ash slags with high content of calcium and low content of silicon

作者：Liu, Xia[1];Yu, Guangsuo[1];Xu, Jianliang[1];Liang, Qinfeng[1];Liu, Haifeng[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, Shanghai 200237, Peoples R China

年份：2017

卷号：158

起止页码：115

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：20165303196612);WOS:【SCI-EXPANDED(收录号:WOS:000394067000011)】；

基金：This work has been partially supported by the National Natural Science Foundation of China (U1402272), the National Natural Science Foundation of China (21376082) and the Foundation of Shanghai Science and Technology Committee (14dz1200100).

语种：英文

外文关键词：Entrained-flow gasification; Coal; Slagging; Viscosity

摘要：This work aims to study the ash slagging behaviors of two specific coals, on account of a blocking problem of the slag discharge encountered when these coals were used in an industrial entrained-flow gasifier. Through the measurements of the ash fusion temperatures (AFTs) and the slag viscosities of the two coal samples, it was found that while the coal ashes had sufficiently low AFTs, they exhibited a strong viscosity fluctuation as well as a slag foaming and expansion. By comparing to the slagging behaviors of some artificial ash mixtures, it was ascertained that while the enrichment of sulfate in the coals ashes was responsible for the slag foaming and expansion, the viscosity fluctuation was attributed to a high content of calcium together with a low Content of silicon in the coal ashes. With the help of X-ray diffraction (XRD) analysis and FactSage thermochemical modeling, it was found that the presence of a crystalline gehlenite phase during the slagging process for the two coal ashes was closely related to the slag viscosity fluctuation. The addition of silica to the coal ashes could virtually eliminate the slag viscosity fluctuation. The sand (a silica rich mineral) addition method had also been successfully used in the industrial gasifier. (C) 2016 Elsevier B.V. All rights reserved.