Effect of slag composition on corrosion resistance of high chromia refractory bricks for industrial entrained-flow gasifier  

作　　者：Jinghong Gao Weiguang Su Xudong Song Peng Lv Jun Yang Guangsuo Yu 

机构地区：[1]State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China [2]Chinese Energy Ningxia Coal Industry Co.,Ltd.,Yinchuan 750021,China [3]Institute of Clean Coal Technology,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第10期139-149,共11页中国化学工程学报（英文版）

基　　金：financial support from the Joint Funds of the National Natural Science Foundation of China(U21A20318).

摘　　要：The slag composition corresponding to different coals varies significantly,which directly affects the operation of industrial entrained-flow gasifier and the service life of refractory bricks.In this study,the corrosion resistance of several typical coal slags for gasification on high chromia refractory bricks was comparatively investigated by static laboratory crucible tests and thermodynamic simulations.The results demonstrated that the corrosion degree of high chromia refractory bricks by different coal slags was high-Ca/Na slag>high-Fe slag>high-Si/Al slag.The surface structure of the refractory was relatively flat after corrosion by high-Si/Al slag,and the primary corrosion reaction was the partial dissolution of the matrix by the slag.High-Fe slag was prone to the precipitation of iron phases as well as the formation of(Mg,Fe)(Al,Cr)_(2)O_(4)composite spinel layer at the slag/refractory interface.The high-Ca/Na slag was susceptible to react with the refractory to yield a low melting point phase,which led to the destruction of the matrix structure of the refractory and an isolated distribution of particles.In addition,the monoclinic ZrO_(2) in the refractory reacted with CaO in the slag to formed calcium zirconate,which loosened its phase toughening effect,was the primary factor that aggravated the refractory corrosion.

关 键 词：Entrained-flow gasifier Coal slag High chromia refractory Corrosion PERMEATION Viscosity 

分 类 号：TQ175.1[化学工程—硅酸盐工业]