Retention mechanism of calcium ferrite and compositions of ash on selenium during chemical looping gasification
作者机构：State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical EngineeringCollege of Chemistry and Chemical EngineeringNingxia UniversityYinchuan750021China Key Laboratory of Clean Chemical Engineering in Universities of ShandongCollege of Chemical EngineeringQingdao University of Science&TechnologyQingdao266042China
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2023年第79卷第8期
页 面：143-152页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学]
主 题：Selenium Chemical looping gasification Oxygen carrier Retention mechanism Ashcomposition
摘 要：Selenium pollution by coal utilization is of increasing ***-iron(Ca-Fe)oxygen carriers(OCs)and alkali metal ions have strong inhibitory effects on selenium,which can reduce the emissions of selenium *** retention mechanisms of selenium by Fe_(2)O_(3),CaFe_(2)O_(4),Ca_(2)Fe_(2)O_(5) and bottom ash are investigated during chemical looping gasification(CLG).Iron-based OC can oxidize H_(2)Se(g)to SeO_(2)(g);furthermore,lattice oxygen is released by Fe_(2)O_(3),contributing to the formation of an Fe-O-Se structure to retain selenium and form *** calcium ferrite is poorly oxidizing,it cannot oxidize H_(2)Se(g),but the CaO produced when OCs are reduced can react with H_(2)Se(g)to form CaSe(s),and this process can be promoted by H_(2)S(g).The best retention rates reached 32.301%when Ca_(2)Fe_(2)O_(5) was *** the cyclic experiment,the selenium retention of the bottom ash gradually *** metal ions in bottom ash are the main factor in retaining ***^(2+) and Mg^(2+) do not easily vaporize due to their high melting points;therefore,their selenium retention is significantly better than that of K^(+) and Na^(+).This research provided a new idea for the removal of selenium by using OCs and bottom ash par-ticles during CLG.
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