Effect of chlorine addition on mercury precipitation during coal combustion

被引：0

作者：

Xiao G. ^{[1
,2
]}

Zhong Z. ^{[1
]}

Jiang C. ^{[1
]}

Han L. ^{[1
]}

Ma T. ^{[1
,2
]}

Zhang S. ^{[1
]}

Jin B. ^{[1
]}

机构：

[1] School of Energy and Environment, Southeast University, Nanjing

[2] National Energy Taicang Power Generation Limited Company, Suzhou

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 12期

关键词：

Chlorine addition; Desulfurization wastewater; Flue gas desimulation; Tube furnace;

D O I：

10.16085/j.issn.1000-6613.2021-1362

中图分类号：

学科分类号：

摘要：

In this paper, mercury emissions from coal combustion and coal chlorination were investigated by using a tubular furnace. The results showed that the percentage of simple substance Hg0 and oxidized Hg2+ in the flue gas after the combustion of raw coal is 74.3% and 25.7%, respectively. With the addition of Cl, the proportion of Hg2+ in the flue gas increased. When the chlorine was 0.015%, 0.030% and 0.045%, the ratio of Hg2+ in the flue gas increased by 32.7%, 36.1% and 40%, respectively, with the increase of chlorine, and its oxidation of mercury was also enhanced. In the field engineering demonstration test, mercury in the hydraulitis in the desulfurized wastewater was utilized to achieve the purpose of desulfurization wastewater and the mercury in the flue gas. With the increase of the amount of desulfurization wastewater sprayed on coal, the proportion of Hg2+ in the flue gas entering the SCR and passing through the SCR increased. Since the adsorption capacity of fly ash to Hg2+ was higher than that of Hg0, the mercury removal efficiency of the electrostatic precipitation system was improved. However, desulfurization wastewater spray coal on the demellular efficiency of wet electric dust removal system was not affected. Conclusively, with increase in the amount of the desulfurization wastewater spray, removal efficiency of mercury by flue gas purification equipment of coal-fired units could be raised. © 2021, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：6557 / 6563

页数：6

共 19 条

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