燃煤耦合污泥发电过程重金属、砷和硒迁移转化试验研究

刘笑; 丹慧杰; 房凡; 周虹光; 张海军; 李帅英

doi:10.19666/j.rlfd.202112249

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燃煤耦合污泥发电过程重金属、砷和硒迁移转化试验研究

城市废弃物资源化利用专栏 | 更新时间：2025-09-28

- 燃煤耦合污泥发电过程重金属、砷和硒迁移转化试验研究
- A test study on migration and transformation of heavy metals, As and Se in coal and sludge co-firing power generation system
- 热力发电 2022年51卷第5期页码：65-72
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能长江环保科技有限公司
  3. 西安西热锅炉环保工程有限公司
  4. 中国科学院大连化学物理研究所
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202112249
  中图分类号： X131;X703
- 纸质出版日期：2022
- 稿件说明：
移动端阅览
刘笑, 丹慧杰, 房凡, 等. 燃煤耦合污泥发电过程重金属、砷和硒迁移转化试验研究[J]. 热力发电, 2022,51(5):65-72.

LIU Xiao, DAN Huijie, FANG Fan, et al. A test study on migration and transformation of heavy metals, As and Se in coal and sludge co-firing power generation system[J]. Thermal power generation, 2022, 51(5): 65-72.
刘笑, 丹慧杰, 房凡, 等. 燃煤耦合污泥发电过程重金属、砷和硒迁移转化试验研究[J]. 热力发电, 2022,51(5):65-72. DOI： 10.19666/j.rlfd.202112249.

LIU Xiao, DAN Huijie, FANG Fan, et al. A test study on migration and transformation of heavy metals, As and Se in coal and sludge co-firing power generation system[J]. Thermal power generation, 2022, 51(5): 65-72. DOI： 10.19666/j.rlfd.202112249.

摘要

污泥成分复杂，其重金属等痕量元素的质量浓度普遍高于电厂入炉煤。为了解燃煤耦合污泥发电过程中重金属和As、Se的迁移转化行为，在某600 MW机组四角切圆锅炉上进行了污泥实炉掺烧试验，在未掺烧污泥和掺烧污泥2个工况下，通过对入炉煤粉、污泥、石灰粉、炉渣、飞灰、脱硫石膏、脱硫废水和烟囱气进行采样分析，得出各痕量元素在不同输入、输出物质中的质量浓度和质量分配，预测了由掺烧污泥引起的燃煤电厂重金属、As和Se的环境排放增加风险。结果表明：煤和污泥燃烧后绝大部分痕量元素转移至飞灰和炉渣中，挥发性元素Hg、Cd、Pb、As和Se在脱硫石膏中的富集比率明显高于非挥发性元素Zn、Ni、Co、Mn和V，挥发性最强的Hg约有30%被脱硫系统捕集；掺烧1%污泥没有显著影响10种重金属、As和Se在输出物质炉渣、飞灰、脱硫石膏和烟囱气中的质量浓度和质量分配比率，烟气中Hg的质量浓度满足《火电厂大气污染物排放标准》（GB13223—2011）的排放限值；在掺烧污泥过程中，应定期对入炉污泥、煤粉和烟囱气中的重金属、As和Se的质量浓度进行监测，以防止排放量大幅增加。

Abstract

Sludge has a complex composition

which usually contains trace elements(such as heavy metals) with higher mass concentraiton than the coal used by power plants. In this study

a test of sludge and coal co-combustion was conducted on a 600 MW tangentially-fired boiler to investigate the migration and transformation behaviors of heavy metals

As and Se. Under the conditions with and without sludge

the samples of coal

sludge

limestone powder

slag

fly ash

desulfurization gypsum

desulfurization wastewater and stack gas were collected and analyzed. Mass concentrations of trace elements in different input and output materials were measured and the mass flows were calculated. Furthermore

the increasing risk of environmental emission of heavy metals

As and Se induced by sludge addition was predicted. The obtained results indicate that

most of the trace elements transferred into slag and fly ash. The enrichment rates of volatile elements such as Hg

As and Se in desulfurization gypsum were significantly higher than that of non-volatile elements such as Zn

Mn and V in desulfurization gypsum. About 30% of the released Hg which has the highest volatility was captured by the desulfurization system.The addition of small quantity(1%) of sludge did not significantly affect the mass concentrations and mass flow rates of 10 heavy metals

As and Se in output materials including slag

fly ash

desulfurization gypsum and stack gas. The measured mass concentrations of Hg in flue gas were lower than the emission limit of Emission Standard of Air Pollutants for Thermal Power Plants(GB 13223—2011). It was suggested that

the mass concentrations of heavy metals

As and Se in sludge

coal and stack gas should be regularly monitored to avoid large increase of emission levels.

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