Mercury emission and speciation in fly ash from a 35 MWth large pilot boiler of oxyfuel combustion with different flue gas recycle

被引：35

作者：

Yang, Jianping ^{[1
]}

Ma, Siming ^{[1
]}

Zhao, Yongchun ^{[1
]}

Zhang, Junying ^{[1
]}

Liu, Zhaohui ^{[1
]}

Zhang, Shihong ^{[1
]}

Zhang, Yi ^{[1
]}

Liu, Yaming ^{[2
]}

Feng, Yongxin ^{[2
]}

Xu, Kai ^{[2
]}

Xiang, Jun ^{[1
]}

Zheng, Chuguang ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, State Key Lab Coal Combust, Wuhan 430074, Peoples R China

[2] Guangdong Power Grid Co, Elect Power Res Inst, Guangzhou 510080, Guangdong, Peoples R China

来源：

FUEL | 2017年 / 195卷

基金：

中国国家自然科学基金;

关键词：

Mercury; Oxyfuel combustion; Flue gas recycle; Fly ash; Species; OXY-FUEL COMBUSTION; PULVERIZED COAL COMBUSTION; TRACE-ELEMENTS; FATE; SULFUR; CARBON; TECHNOLOGY; DESORPTION; OXIDATION; CATALYST;

D O I：

10.1016/j.fuel.2017.01.036

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The behaviour of mercury is investigated in a 35 MWth large pilot boiler of oxyfuel combustion with dry and wet flue gas recycle (FGR). The mercury species in fly ash particles as well as the involved reaction mechanism are systematically investigated. The results suggest that higher concentration of gas-phase mercury (He) is contained in oxyfuel combustion flue gas. The conversion of He to particulate associated mercury (He) is enhanced in oxyfuel combustion. Different mercury species are presented in fly ash collected from air and oxyfuel combustion: trigonal red HgS is the main mercury species in air combustion; mercury bound to organic matter (Hg-OM) and trigonal red HgS are both dominant in the samples from oxyfuel combustion. The prominent difference is the significantly increase of Hg-OM in oxyfuel combustion atmosphere. The oxyfuel combustion atmosphere would favor the formation of oxygen-rich functional groups, especially the C=O group, which is responsible for the adsorption of mercury and formation of Hg-OM in fly ash. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：174 / 181

页数：8

共 41 条

[1] The role of unburned carbon concentrates from fly ashes in the oxidation and retention of mercury [J].