Experimental and numerical simulation of lignite chemical looping gasification with phosphogypsum as oxygen carrier in a fluidized bed

作     者：Wang Du Liping Ma Jing Yang Wei Zhang Ran Ao Wang Du;Liping Ma;Jing Yang;Wei Zhang;Ran Ao

作者机构：Faculty of Environmental Science and EngineeringKunming University of Science and TechnologyKunming 650500China School of Environmental and Municipal EngineeringXi’an University of Architecture and TechnologyXi’an 710000China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2021年第34卷第9期

页      面：197-207页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：Financial support for this project were provided by National Natural Science Foundation of China(No.21666016) National Key Research and Development Program of China(2018YFC1900200) State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(2021-K39)。 

主　　题：Phosphogypsum Lignite Chemical looping gasification Fluidized-bed Syngas Computational fluid dynamics 

摘      要：Phosphogypsum(PG)is a solid waste produced in the wet process of producing phosphoric acid.Lignite is a kind of promising chemical raw material.However,the high sulfur of lignite limits the utilization of lignite as a resource.Based on fluidized bed experiments,the optimal reaction conditions for the production syngas by lignite chemical looping gasification(CLG)with PG as oxygen carrier were studied.The study found that the optimal reaction temperature should not exceed 1123 K;the mole ratio of water vapor to lignite should be about 0.2;the mole ratio of PG oxygen carrier to lignite should be about 0.6.Meanwhile,commercial software Comsol was used to establish a fuel reaction kinetics model.Through computational fluid dynamics(CFD)numerical simulation,the process of reaction in fluidized bed were well captured.The model was based on a two-fluid model and coupled mass transfer,heat transfer and chemical reactions.This study showed that the fluidized bed presents a flow structure in which gas and solid coexist.There was a high temperature zone in the middle and lower parts of the fluidized bed.It could be seen from the results of the flow field simulated that the fluidized bed was beneficial to the progress of the gasification reaction.