Application of Mercury Removal by Mechanical Coupling Brominated Fly Ash on 330 MW Coal-fired Unit

被引：0

作者：

Fu G. ^{[1
]}

Wang J. ^{[2
]}

Wang T. ^{[2
]}

Zhang Y. ^{[2
]}

机构：

[1] Guoneng (Tianjin) Dagang Power Plant Co., Ltd., Binhaixin District, Tianjin

[2] School of Energy, Power and Mechanical Engineering, North China Electric Power University, Changping District, Beijing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2022年 / 42卷

关键词：

fly ash; mechanical coupling bromination modification; mercury; mercury balance;

D O I：

10.13334/j.0258-8013.pcsee.222010

中图分类号：

学科分类号：

摘要：

Mercury in coal-fired flue gas is very harmful to human and the environment. In this paper, the removal of mercury from flue gas by mechanical coupling bromination modified fly ash was studied, and the mercury removal performance of modified fly ash was verified in 330MW coal-fired unit. The experimental results show that the mercury removal efficiency of the original fly ash is only 14.3%. After mechanical coupling bromination modification, the mercury removal efficiency increases to 31.8%. Mechanical crushing reduces the particle size of fly ash, exposes a large number of fresh irregular surfaces and unburned carbon, and increases the activity of fly ash. At the same time, NaBr modification makes the surface loaded with Br element, further increases the affinity for mercury, and mechanical force synergistic bromination strengthens the mercury removal performance of fly ash. The results of mercury removal from flue gas of 330MW coal-fired unit show that the total mercury removal efficiency of the existing air pollution control device (APCD) is as high as 96.83%, the mechanical coupling bromination modified fly ash has a strong ability to oxidize elemental mercury, which can oxidize elemental mercury into divalent mercury, and then combine with fly ash to form particulate mercury, which is removed by ESP equipment. Compared with no injection, the mercury concentration of ESP outlet flue gas can be reduced by 48.48~73.23% after the injection of the modified fly ash. ©2022 Chin.Soc.for Elec.Eng.

引用

页码：149 / 155

页数：6

共 13 条

[1]

WANG Shumin, ZHANG Yongsheng, Yongzheng GU, Using modified fly ash for mercury emissions control for coal-fired power plant applications in China [J], Fuel, 181, pp. 1230-1237, (2016)

[2]

Longchun ZHONG, Wenhan LI, ZHANG Yongsheng, Kinetic studies of mercury adsorption in activated carbon modified by iodine steam vapor deposition method[J], Fuel, 188, pp. 343-351, (2017)

[3]

Guoliang LI, Qingru WU, WANG Shuxiao, Improving flue gas mercury removal in waste incinerators by optimization of carbon injection rate [J], Environmental Science & Technology, 52, 4, pp. 1940-1945, (2018)

[4]

ZHONG Longchun, ZHANG Yongsheng, JI Yong, Synthesis of activated carbon from coal pitch for mercury removal in coal-fired power plants[J], Journal of Thermal Analysis and Calorimetry, 123, 1, pp. 851-860, (2016)

[5]

GB 13223—2011 Emission standard of air pollutants for thermal power plants[S], (2012)

[6]

ZHENG Chuguang, ZHANG Junying, ZHAO Yongchun, Emission and control of mercury from coal combustion[M], (2010)

[7]

PAVLISH J H, HOLMES M J, BENSON S A, Application of sorbents for mercury control for utilities burning lignite coal[J], Fuel Processing Technology, 85, 6-7, pp. 563-576, (2004)

[8]

The state of U.S. mercury control in response to MATS, (2015)

[9]

WANG Shumin, ZHANG Yongsheng, Yongzheng GU, Coupling of bromide and on-line mechanical modified fly ash for mercury removal at a 1000 MW coal-fired power plant[J], Fuel, 247, pp. 179-186, (2019)

[10]

ZHANG Yongsheng, MEI Dongqian, WANG Tao, In-situ capture of mercury in coal-fired power plants using high surface energy fly ash[J], Environmental Science & Technology, 53, 13, pp. 7913-7920, (2019)

← 1 2 →