某600 MW机组燃煤电厂Hg的分布、排放特征及迁移、释放规律

王文惠

doi:10.13205/j.hjgc.202006032

某600 MW机组燃煤电厂Hg的分布、排放特征及迁移、释放规律

doi: 10.13205/j.hjgc.202006032

王文惠

内蒙古自治区呼伦贝尔生态环境监测站, 内蒙古呼伦贝尔 021008

基金项目:

内蒙古自治区科技计划项目(201802101)。

详细信息

作者简介:
王文惠(1977-),女,本科,高级工程师。主要研究方向为环境监测、环境影响评价。wwh4866@126.com

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出版历程
- 收稿日期: 2019-08-30

DISTRIBUTION AND EMISSION CHARACTERISTICS, MIGRATION AND RELEASE REGULATION OF MERCURY IN A 600 MW COAL-FIRED POWER PLANT

WANG Wen-hui

Hulunbuir Enironmental Monitoring Center Station, Hunlunbeir 021008, China

摘要

摘要: 为全面表征某600 MW超低排放燃煤机组的Hg分布特征及迁移、释放规律,开展了现场实测研究。结果表明:煤中Hg含量的平均值为310 μg/kg,炉渣、粉煤灰、石膏、废水、烟气中Hg的分布系数分别为1.9%、37.5%、34.6%、0.8%、24.8%;整个烟气治理系统的总Hg脱除效率为74.7%,最终总Hg排放为6.0 μg/m³,SCR脱硝、烟气冷却器对Hg⁰转化效率分别达到44.2%、30.4%,低低温电除尘器几乎实现Hg^p完全脱除,WFGD对Hg²⁺脱除效率达到80.7%;该电厂Hg一次释放量达到783 kg/a(其中,大气直排188 kg/a),二次释放量为334 kg/a。该成果可为燃煤电厂烟气Hg排放控制标准出台及控制技术的选择提供借鉴。
- 燃煤电厂 /
- 超低排放 /
- Hg /
- 分布特征 /
- 迁移规律 /
- 释放规律
Abstract: In order to characterize the Hg distribution characteristics, migration and its release rules of a 600MW unit ultra-low emission coal-fired power, field measurement research was conducted in this paper. The results showed that, the mean value of Hg content in coal was 310μg/kg, and the distribution coefficients of Hg in slag, fly ash, gypsum, waste water and flue gas were 1.9%, 37.5%, 34.6%, 0.8% and 24.8%, respectively. The removal efficiency of Hg in the whole flue gas treatment system was 74.7%, and final total Hg emission was 6.0 μg/m³. The conversion efficiency of SCR and flue gas cooler on Hg⁰ were 44.2% and 30.4%, respectively. The removal efficiency of Hg^P in LL-ESP was nearly 100%, and the removal efficiency of Hg²⁺ in WFGD was 80.7%. The primary release of Hg from the power plant was 783 kg/a (with atmospheric emission of 188 kg/a), and the secondary release was 334 kg/a. This paper could provide references for the release of Hg emission control standards and selection of control technologies for coal-fired power plants.
- coal-fired power plant /
- ultra-low emission /
- Hg /
- distribution characteristics /
- migration rules /
- release rules

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