Migration characteristics of mercury and mercury adsorption characteristics of fly ash in CFB boiler firing high mercury coal

GAO Xin; WANG Quanhai; XIONG Deyang; LU Xiaofeng; LI Jianbo; ZHANG Rongdi; LONG Xiaofei; ZHANG Jiabao; ZOU Xingdong

doi:10.19666/j.rlfd.202110207

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Migration characteristics of mercury and mercury adsorption characteristics of fly ash in CFB boiler firing high mercury coal

Thermal Power Generation Vol. 51, Issue 4, Pages: 120-126(2022)

更新时间：2025-09-28

- Migration characteristics of mercury and mercury adsorption characteristics of fly ash in CFB boiler firing high mercury coal
- 作者机构：
  
  低品位能源利用技术及系统教育部重点实验室(重庆大学)
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202110207
  CLC： TK229.66;X701
- Published：2022
- 稿件说明：
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GAO Xin, WANG Quanhai, XIONG Deyang, et al. Migration characteristics of mercury and mercury adsorption characteristics of fly ash in CFB boiler firing high mercury coal[J]. Thermal Power Generation, 2022, 51(4): 120-126.
DOI：

GAO Xin, WANG Quanhai, XIONG Deyang, et al. Migration characteristics of mercury and mercury adsorption characteristics of fly ash in CFB boiler firing high mercury coal[J]. Thermal Power Generation, 2022, 51(4): 120-126. DOI： 10.19666/j.rlfd.202110207.

摘要

为研究我国西南地区燃用高汞煤工业循环流化床（CFB）锅炉中汞的迁移转化特性以及飞灰对汞的吸附特性，使用LumexRA-915M汞在线分析仪对锅炉烟道不同位置烟气进行在线监测，同时对入炉煤、底渣、飞灰、脱硫浆液、脱硫废水等进行取样分析。结果表明：除尘器前烟气中的汞超过87%富集于飞灰中，底渣中汞仅占0.07%，飞灰对汞的富集主要归因于其未燃尽碳（UBC）含量、矿物组成及孔隙结构；锅炉所配备的布袋除尘器和湿法脱硫设备的除汞效率分别为91.19%和51.49%，最终排往大气的烟气汞质量浓度仅为3.43μg/m3，高汞煤在CFB内燃烧汞排放达到了国家排放要求。此外，发现不同粒径下飞灰汞含量与UBC含量有相同趋势，而且飞灰中汞主要富集在飞灰表面并主要是以HgO和Hg0的形式存在。

Abstract

In order to study the migration characteristics of mercury and adsorption characteristics of fly ash on mercury in industrial circulating fluidized bed(CFB) boiler burning high mercury coal in southwest China

Lumex RA-915M mercury online analyzer was used to monitor the flue gas in different positions of the boiler flue.Meanwhile

the feed coal

bottom ash

fly ash

desulfurization slurry and wastewater were sampled and analyzed.The results show that

more than 87% of the mercury in flue gas in front of the dust collector is enriched in fly ash

and only 0.07% of the mercury exists in bottom ash. The enrichment of mercury in fly ash is mainly due to the unburned carbon(UBC) content

mineral composition and pore structure of fly ash. The mercury removal efficiency of fabric filter and wet desulfurization equipment is 91.19% and 51.49%

respectively

and the mass concentration of mercury in flue gas discharged to atmosphere is only 3.43 μg/m3

which meets the national emission requirements.In addition

the fly ash was characterized

it finds that

the mercury content and UBC content in fly ash with different particle sizes has the same change trend. The mercury existing in the form of HgO and Hg0 in the fly ash is mainly enriched on surface of the fly ash.

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