Migration characteristics of Hg from a 1 000 MW ultra-low emission coal-fired power plant

SHI Zhipeng; DUAN Lunbo; HUANG Zhijun

doi:10.19666/j.rlfd.202012302

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Migration characteristics of Hg from a 1 000 MW ultra-low emission coal-fired power plant

更新时间：2025-09-28

- Migration characteristics of Hg from a 1 000 MW ultra-low emission coal-fired power plant
- Thermal Power Generation Vol. 50, Issue 7, Pages: 176-182(2021)
- 作者机构：
  
  1. 东南大学能源热转换及其过程测控教育部重点实验室
  2. 江苏方天电力技术有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202012302
  CLC： X773
- Published：2021
- 稿件说明：
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SHI Zhipeng, DUAN Lunbo, HUANG Zhijun. Migration characteristics of Hg from a 1 000 MW ultra-low emission coal-fired power plant[J]. Thermal power generation, 2021, 50(7): 176-182.
DOI：

SHI Zhipeng, DUAN Lunbo, HUANG Zhijun. Migration characteristics of Hg from a 1 000 MW ultra-low emission coal-fired power plant[J]. Thermal power generation, 2021, 50(7): 176-182. DOI： 10.19666/j.rlfd.202012302.

摘要

为研究国内某燃煤电厂1 000 MW超低排放机组中汞(Hg)的排放特性

采用EPA Method 30B对机组不同位置的烟气进行平行取样

同时对原煤、底渣、飞灰、脱硫废水以及湿式电除尘器(WESP)废水等也进行了取样分析。结果表明:Hg的质量平衡率为96.65%

在可接受范围内;燃煤烟气中的Hg主要以颗粒态汞(Hg~P)、气态二价汞(Hg~(2+))以及气态单质汞(Hg~0)3种形态存在;选择性催化还原(SCR)脱硝系统对Hg~0的氧化率为43.81%;电除尘器(ESP)脱除烟气中汞的能力体现在对Hg~P的脱除

其对Hg~P的脱除效率为98.88%;湿法脱硫装置(WFGD)对Hg~(2+)具有极佳的脱除效果

脱除效率达到98.10%;各污染物控制装置(APCDs)对总汞(Hg ~T)的脱除效率按高低顺序排列为WFGD(60.13%)、WESP(40.00%)、ESP(38.95%)

整个系统对Hg ~T的脱除效率为87.23%;最终排放烟气中的Hg~T质量浓度为1.89μg/m~3

达到我国环保部规定的排放限值。

Abstract

In order to study the emission characteristics of mercury (Hg) from a 1 000 MW ultra-low emission coalfired power plant in China

the EPA Method 30B was used to sample the flue gas in different sites simultaneously.Moreover

solid and liquid samples

including the raw coal

bottom ash

fly ash

wastewater of desulfurization and wet electrostatic precipitator (WESP)

were also collected for analysis.The results show that

the mass balance rate of Hg was 96.65%

which is acceptable.The Hg in the flue gas mainly exists in three forms:particulate-bound mercury (Hg~P)

gaseous oxidized mercury (Hg~(2+)) and gaseous elemental mercury (Hg~0).The oxidation rate of Hg~0 across the selective catalytic reduction (SCR) denitraiton system was 45.47%.The electrostatic precipitator (ESP)had high Hg~P capture efficiency

at 98.88%.The wet flue gas desulfurization (WFGD) had high Hg~(2+)capture efficiency

at 98.10%.The removal efficiency of total Hg (Hg~T) by each air pollutants control device (APCD) was as follows:WFGD (60.13%)ESP (40.00%)WESP (38.95%).The removal efficiency of Hg~T by the system was 87.23%.The emission mass concentration of Hg~T in this study was 1.89μg/m~3

which has met the emission limits set by the ministry of environmental protection.

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