Effect of flue gas components on Hg0 oxidation and adsorption by modified walnut shell coke in O2/CO2 atmosphere

被引:10
作者
Zhang, Xiang [1 ]
Duan, Yufeng [1 ]
Wang, Hui [2 ]
Ren, Shaojun [1 ]
Wei, Hongqi [1 ]
机构
[1] Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Peoples R China
[2] Nanjing Univ Sci & Technol, Sch Energy & Power Engn, Nanjing, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
O-2; CO2; atmosphere; modified walnut shell coke; oxidation; adsorption; mercury valence distribution; OXY-FUEL COMBUSTION; ELEMENTAL MERCURY REMOVAL; ACTIVATED CARBONS; COAL COMBUSTION; BIO-CHARS; REGENERABLE SORBENT; FLUIDIZED-BED; CAPTURE; CO2; EQUILIBRIUM;
D O I
10.1002/apj.2423
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Walnut shell was pyrolyzed and then impregnated with NH4Br to make sorbent for Hg-0 removal. The effect of flue gas components on Hg-0 removal performance was studied in O-2/CO2 atmosphere, and the results were compared with those in O-2/N-2 atmosphere. The mercury valence distribution during adsorption was obtained. NH4Br-modified walnut shell coke promoted Hg-0 removal, the Br-containing chemisorption site was a crucial factor. Although addition of CO2 did not introduce new oxygen-containing functional groups or change the mercury species, Hg-0 removal efficiency increased significantly. This may be because CO2 can increase the active sites on the carbon surface. In O-2/N-2 atmosphere, O-2 promoted formation of active center on the sorbent surface, which made Hg-0 more easily adsorbed and then reacted with Br-functional group to form more HgBr2. In O-2/CO2 atmosphere, O-2 promoted formation of some reactive carbon-oxygen complexes which acted as catalyst to facilitate Hg-0 oxidation and formation of HgO. NO improved removal of Hg-0, because the C & x2500;O functional group on the sorbent surface could catalyze the conversion of NO to NO2 in the adsorbed state and then formed Hg-2(NO3)(2). SO2 consumed oxygen on the sorbent surface and inhibited the Hg-0 removal.
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页数:13
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