Flow Properties of Entrained Flow Gasifier Fine Slag and Network Structure of its Molten Slag  

作　　者：ZHOU Li REN Qiangqiang YANG Guiyun XU Jing LI Wei 

机构地区：[1]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Thermal Science》2023年第5期1878-1888,共11页热科学学报（英文版）

基　　金：financially supported by Class A Strategic Pilot Science and Technology Project,Chinese Academy of Sciences(Grant No.XDA21040602);the National Natural Science Foundation of China(Grant No.U1810127);the Youth Innovation Promotion Association,Chinese Academy of Science(Grant No.Y201932)。

摘　　要：The entrained flow gasification has been identified as the most promising gasification technology.Serious environmental pollution and waste of land resources are caused by the increasing amount of storage and production of coal gasification slag.The aim of this work is to explore the feasibility of high-temperature combustion and melting technology for treating coal gasification fine slag and determine the important parameters of system operation.The flow properties and molten slag structure characteristics of three fine slags from different entrained flow gasifiers were studied.Depending on the melting mechanism of melt-dissolution,the melting time of fine slags is short.Three fine slags all produce glassy slags,which is conducive to slag discharge.The degree of polymerization of silicate melt is proportionate to the amount of SiO_(2)in the slag.A part of Al^(3+)exist in the form of[AlO_(4)]^(5-)because of the effect of CaO and Na_(2)O,as the network former.Finally,the degree of polymerization of the three type molten slag was calculated by considering the role of Si and Al in molten slag and the property of each one.

关 键 词：entrained flow gasification slag fusion process viscosity temperature characteristic molten slag aluminosilicate network structure 

分 类 号：TQ536.4[化学工程—煤化学工程]