共 55 条
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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