燃煤烟气中Hg迁移转化特性研究

doi:10.12096/j.2096-4528.pgt.20079

发电技术 ›› 2020, Vol. 41 ›› Issue (5): 489-496.DOI: 10.12096/j.2096-4528.pgt.20079

• 厂界环保岛与数字孪生技术 • 上一篇下一篇

燃煤烟气中Hg迁移转化特性研究

安晓雪¹(),苏胜¹,向军^1,*(),黄见勋²,许积庄²,王乐乐³,汪一¹,胡松¹,尹子骏¹,王中辉¹

¹ 煤燃烧国家重点实验室(华中科技大学), 湖北省武汉市 430074
² 厦门华夏国际电力发展有限公司, 福建省厦门市 361026
³ 西安热工研究院有限公司苏州分公司, 江苏省苏州市 215153

收稿日期:2020-09-04 出版日期:2020-10-30 发布日期:2020-11-02
通讯作者: 向军
作者简介:安晓雪(1997),女,硕士研究生,研究方向为重金属迁移转化, 2731506733@qq.com
基金资助:
国家自然科学基金项目(U1910214);国家自然科学基金项目(51976072);国投电力科技项目(2020-KJ-007)

Hg Formation and Transformation Characteristics in Flue Gas of Coal-fired Boiler

Xiaoxue AN¹(),Sheng SU¹,Jun XIANG^1,*(),Jianxun HUANG²,Jizhuang XU²,Lele WANG³,Yi WANG¹,Song HU¹,Zijun YIN¹,Zhonghui WANG¹

¹ State Key Laboratory of Coal Combustion(Huazhong University of Science & Technology), Wuhan 430074, Hubei Province, China
² Xiamen Huaxia International Power Development Co., Ltd., Xiamen 361026, Fujian Province, China
³ Suzhou Branch, Xi'an Thermal Power Research Institute Co., Ltd., Suzhou 215153, Jiangsu Province, China

Received:2020-09-04 Published:2020-10-30 Online:2020-11-02
Contact: Jun XIANG
Supported by:
National Natural Science Foundation of China(U1910214);National Natural Science Foundation of China(51976072);SDIC Power Technology Project(2020-KJ-007)

摘要/Abstract

摘要：

研究了300 MW煤粉锅炉系统选择性催化还原（selective catalytic reduction，SCR）、低低温电除尘器、海水脱硫、湿式电除尘器等超低排放设施在不同工况、不同煤种情况下的Hg迁移特性和脱除能力。结果表明：各工况下总汞排放浓度为1.16~2.90 μg/m³。最终排入大气中的汞主要以单质汞存在，还有少量氧化态汞，颗粒态汞被全部脱除；汞主要是在海水法烟气脱硫中被去除的，低低温电除尘器、海水脱硫、湿式电除尘器对总汞平均脱除率分别为25%、62%、37%；Hg²⁺占比是影响烟气中汞脱除效率的关键，气相中较高的Hg²⁺份额有利于在电除尘器和海水脱硫装置中获得较高的脱除效率；在该配备SCR脱硝、低低温电除尘器、海水脱硫、湿式电除尘器等超低排放设施的300 MW煤粉锅炉电厂中，总汞平均脱除率约为83%，能够实现较大程度的汞脱除。

关键词: 燃煤电厂, 汞, 烟气, 迁移转化, 超低排放

Abstract:

The transfer characteristics and removal capability of Hg in ultra-low emission facilities such as selective catalytic reduction (SCR), low temperature electrostatic precipitator, seawater desulfurization and wet electrostatic precipitator in a 300 MW coal-fired boiler of a power plant were studied under different working conditions and different types of coal. The results show that under different working conditions, the total emission concentration of mercury is basically 1.16-2.90 μg/m³. The final release of mercury into the atmosphere is mainly composed of elemental mercury and a small amount of oxidized mercury, the particulate mercury was completely removed. Most mercury is removed in seawater flue gas desulfurization. The overall removal efficiency of mercury of low temperature electric precipitator, a seawater flue gas desulfurization scrubber and wet electric precipitator is 25%, 62% and 37% respectively on average. The proportion of Hg²⁺ is the key to affect the efficiency of mercury removal in flue gas, and the higher proportion of Hg²⁺ in flue gas is beneficial to obtain higher efficiency in electrostatic precipitators and seawater flue gas desulfurization devices. In the 300 MW coal-fired boiler of a power plant equipped with a selective catalytic reduction unit, a low temperature electrostatic precipitator, a seawater flue gas desulfurization scrubber, and a wet electrostatic precipitator and other ultra-low emission facilities, the average removal rate of total mercury is about 83%, which can achieve greater levels of mercury removal.

Key words: coal-fired power plants, mercury, flue gas, migration, ultra-low emission

中图分类号:

TK16

安晓雪,苏胜,向军,黄见勋,许积庄,王乐乐,汪一,胡松,尹子骏,王中辉. 燃煤烟气中Hg迁移转化特性研究[J]. 发电技术, 2020, 41(5): 489-496.

Xiaoxue AN,Sheng SU,Jun XIANG,Jianxun HUANG,Jizhuang XU,Lele WANG,Yi WANG,Song HU,Zijun YIN,Zhonghui WANG. Hg Formation and Transformation Characteristics in Flue Gas of Coal-fired Boiler[J]. Power Generation Technology, 2020, 41(5): 489-496.

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燃煤烟气中Hg迁移转化特性研究

Hg Formation and Transformation Characteristics in Flue Gas of Coal-fired Boiler

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