Sulfur evolution characteristics during chemical looping combustion of Liuzhi Coal in Guizhou Province and CuFeMnO4 composite oxygen carrier
LI Weiguang
DING Ning
LIN Deshun
WANG Mengjia
QU Xinxin
YAO Danyi
HAO Shuai
WANG Baowen
Abstract：The sulfur content of pyrite in coal is high,and it is directly used for coal chemical looping combustion,and its migration is complicated,causing many adverse effects,which needs to be paid attention to.Select Liuzhi Coal(LZ)in Guizhou Province,deash it by pickling and remove pyrite sulfur directionally,then add quantitative pyrite model compound as fuel(LZ-DP+FeS2),self-made CuFeMnO4 composite oxygen carrier,In the double-temperature tube furnace,the transfer of oxygen,the evolution of sulfur and the interaction between the two reacted at different temperatures were systematically studied.The results show that the doping of Mn effectively enhances the reduction of Fe3+in CuFeMnO4,the transfer of oxygen and its reactivity;When LZ-DP+FeS2 coal is pyrolyzed alone,pyrite sulfur evolves complexly and produces different gaseous sulfur components such as H2S,SO2,COS and CS2,but when a certain amount of CuFeMnO4 is added,it decomposes and releases O2 successively and transfers the lattice oxygen in it,so that all kinds of gaseous sulfur are fully oxidized at high temperature to form more SO2.Multiple cycle experiments show that CuFeMnO4 has enhanced directional sulfur fixation ability while maintaining good regenerative ability,and has great application potential in coal chemical looping combustion.
Keywords：Liuzhi coalchemical looping combustionCuFeMnO4 oxygen carrierpyritesulfur evolution
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 209-217 )