Characterization of dust characteristics from sludge co-combustion in coal-fired units and experimental study on retrofit of pneumatically rapped ESP

ZHAO Haibao; TANG Zhichang; WANG Shaoquan; XIE Jie; XU Jianli

doi:10.13205/j.hjgc.202606019

Volume 44 Issue 6

Jun. 2026

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2026 > 44(6): 183-189

ZHAO Haibao, TANG Zhichang, WANG Shaoquan, XIE Jie, XU Jianli. Characterization of dust characteristics from sludge co-combustion in coal-fired units and experimental study on retrofit of pneumatically rapped ESP[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 183-189. doi: 10.13205/j.hjgc.202606019

Citation:

ZHAO Haibao, TANG Zhichang, WANG Shaoquan, XIE Jie, XU Jianli. Characterization of dust characteristics from sludge co-combustion in coal-fired units and experimental study on retrofit of pneumatically rapped ESP[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 183-189. doi: 10.13205/j.hjgc.202606019

Citation:

ZHAO Haibao, TANG Zhichang, WANG Shaoquan, XIE Jie, XU Jianli. Characterization of dust characteristics from sludge co-combustion in coal-fired units and experimental study on retrofit of pneumatically rapped ESP[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 183-189. doi: 10.13205/j.hjgc.202606019

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Characterization of dust characteristics from sludge co-combustion in coal-fired units and experimental study on retrofit of pneumatically rapped ESP

doi: 10.13205/j.hjgc.202606019

1. Zhejiang Feida Environmental Science & Technology Co., Ltd., Zhuji 311800, China;
2. Key Laboratory of Coal-fired Flue Gas Purification Equipment Research of Zhejiang Province, Zhuji 311800, China;
3. Zhejiang Zheneng Jiahua Power Generation Co., Ltd., Jiaxing 314000, China

Received Date: 2025-06-16
Accepted Date: 2025-07-10
Rev Recd Date: 2025-06-29

Available Online: 2026-07-06

Abstract

Abstract

The flue gas and dust generated by sludge co-combustion in coal-fired power plants exhibit high viscosity， leading to severe dust deposition on downstream environmental protection equipment. In this context， the dust deposition mechanism inside electrostatic precipitator （ESP） was analyzed， and the characteristics of dust layers were characterized. The results indicated that sludge co-combustion in coal-fired units increased flue gas moisture content， changed particle morphology， and elevated dust viscosity. To address this issue， an anode pneumatically rapped ESP technology was developed to improve the dust cleaning efficiency of the anode plates. This technology was applied to the retrofit of a 1000 MW coal-fired unit at Zhejiang Jiahua Power Plant， and corresponding engineering verification tests were carried out. ESP performance tests under sludge co-combustion conditions were completed in February 2025. The test results showed that， at a specific dust collection area of 118 m²·s/m³ and a unit load of 987 MW， the dust concentration at the outlet of the ESP decreased from 25.32 mg/m³ before the retrofit to 7.95 mg/m³ after the retrofit. Analysis revealed that sludge co-combustion caused excessive dust deposition on the anode plates of the first electric field， which induced back corona， high-voltage power supply flashover， and low operating parameters of secondary voltage and current. After the retrofit with the pneumatically rapped ESP， regions with low rapping acceleration on the plates were eliminated， achieving effective dust cleaning of anode plates. Meanwhile， the secondary voltage and current of the high-voltage power supply were significantly improved， and the overall dust collection efficiency of the ESP was remarkably enhanced. The proposed pneumatically rapped ESP technology can provide a reference for ESP retrofitting of coal-fired units under biomass （sludge） co-combustion and low-load operating conditions.
- coal-fired units,
- biomass co-combustion,
- sludge co-combustion,
- energy saving and emissions reduction,
- pneumatic rapping,
- ESP retrofitting

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References(23)

References

[1]	TOSHIAKI M，YOSHIHIKO M. Recent application and running cost of moving electrode type electrostatic precipitator[C]// 11th International Conference on Electrostatic Precipitation. 2008：518-522.
[2]	ZHAO H B，LI J G，HE Y Z，et al. Research and application on Low-Low temperature electrostatic precipitator technology[J]. Electric Power，2014，47（10）：117-120. 赵海宝，郦建国，何毓忠，等. 低低温关键技术研究与应用[J]. 中国电力，2014，47（10）：117-120.
[3]	ZHAO H B，HE Y Z，ZHANG Y W，et al. Study on adaptation of low-low temperature electrostatic precipitator（LLT-ESP）under complex and varying condition[J]. Environmental Engineering，2018，36（6）：82-85. 赵海宝，何毓忠，章永玮，等. 复杂多变工况下低低温电除尘适应性研究[J]. 环境工程，2018，36（6）：82-85.
[4]	BAI M Y，YI C W，YANG B，et al. Current status and trends of electric dust removal technology research[J]. Journal of Environmental Engineering，2007，1（8）：15-20. 白敏药，依成武，杨波，等. 电除尘技术研究现在及趋势[J]. 环境工程学报，2007，1（8）：15-20.
[5]	DING X L，WANG Q J，LANG J H，et al. Pulse power supply technology for removing high Yang ratio dust[J]. Journal of Environmental Engineering，2018，12（1）：159-161. 丁鑫龙，王琼杰，郎佳红，等. 脉冲供电技术去除高阳比粉尘[J]. 环境工程学报，2018，12（1）：159-161.
[6]	ZHAO H B，YANG G，SHEN J D，et al. Research on the shielding effect of the electrode frames in the electrostatic precipitator.[J]. Journal of the Air& Waste Management Association，2023，73（6）：1-10.
[7]	LIU H X，LUO S Y，YU L Y，ET Al. Study on multi-pollutant test and performance index determination of wet electrostatic precipitator[J]. Separations，2023，10（536）：1-17.
[8]	YAN K P. Electric Dust removal renovation of coal fired power plants：basic principles and industrial applications[C]// China Environmental Protection Industry Association，Anhui Shengyun Environmental Protection（Group）Co.，Ltd. Proceedings of the 17th China Electric Dust Removal Academic Conference. Hefei，2017：32-62. 闫克平. 燃煤电厂电除尘改造：基础原理及工业应用[C]//中国环境保护产业协会，安徽盛运环保（集团）股份有限公司. 第十七届中国电除尘学术会议论文集. 合肥，2017：32-62.
[9]	LI S R，LIU Z，YAN K P. Review on recent development of industrial electrostatic precipitation[J]. International Journal of Plasma Environmental Science and Technology，2025，19（2）：1-10.
[10]	LIU X Y. Research on the enhancement of particle electrostatic capture based on temperature and particle characteristics control[D]. Hangzhou：Zhejiang University，2019. 刘昕涛. 基于温度和颗粒特性调控的颗粒静电捕集增效研究[D]. 杭州：浙江大学，2019.
[11]	China Association of Environmental Protection Industry. Selection and design guidelines for electrostatic precipitators[M]. Beijing：China Electric Power Press，2013. 中国环境保护产业协会. 电除尘器选型设计指导书[M]. 北京：中国电力出版社，2013.
[12]	赵海宝，何毓忠，梁江，等. 一种电除尘器出口小单元气动振打导流收尘装置：CN 2023110013685[P]. 2024-01-12. ZHAO H B，HE Y Z，LIANG J，et al. A small-unit pneumatic rapping flow-guiding dust collection device at electrostatic precipitator outlet：CN 202311001368.5[P]. 2024-01-12.
[13]	ZHAO H N，HE Y Z，WANG S Q，et al. Research and application of small unit pneumatic vibrating electrostatic precipitation technology[J]. Power and Energy，2024，45（3）：359-363. 赵海宝，何毓忠，王少权，等. 小单元气动振打电除尘技术研究及应[J]. 电力与能源，2024，45（3）：359-363.
[14]	赵海宝，汪艺威，袁伟锋，等. 机械气动双重振打型电除尘器：CN 202510199845.6[P]. 2025-05-23. ZHAO H B，WANG Y W，YUAN W F，et al. Mechanical pneumatic dual vibration type electrostatic precipitator：CN 202510199845.6[P]. 2025-05-23.
[15]	ZHANG J T，ZHANG J F，ZHANG J M，et al. A new type of pneumatic hammer device：CN 203390894U[P]. 2014-01-15. 张金涛，张金峰，张金明，等. 一种新型气动锤装置：CN 203390894U[P]. 2014-01-15.
[16]	ZHANG X F. Simulation and development of hammering system for reducing residual stress in laser cladding using hammering method[D]. Suzhou：Suzhou University，2019. 张旭方. 锤击法降低激光熔覆残余应力仿真及捶击系统研制[D]. 苏州：苏州大学，2019.
[17]	BAO W L. A pneumatic hammer type anode vibration device：CN 114029168A[P]. 2022-02-11. 包文隆. 一种气动锤式阳极振打装置：CN 114029168A[P]. 2022-02-11.
[18]	WANG Z S，PAN L B. Numerical simulation study on the implementation effect of atmospheric pollutant emission standards for thermal power plants[J]. Environmental Science，2014，35（3）：853-863. 王占山，潘丽波. 火电厂大气污染物排放标准实施效果的数值模拟研究[J]. 环境科学，2014，35（3）：853-863.
[19]	国家环境保护总局. 固定污染源排气中颗粒物测定与气态污染物采样方法：GB/T16157—1996[S]. 北京：中国标准出版社，1996. State Environmental Protection Administration. Determination of particulate matter and sampling methods for gaseous pollutants in exhaust from fixed pollution sources：GB/T16157—1996[S]. Beijing：China Standard Press，1996.
[20]	国家环境保护总局科技标准司. 固定源废气检测技术规范：HJ/T 397—2007[S]. 北京：中国环境科学出版社，2007. Technology Standards Department of the State Environmental Protection Administration. Technical specification for fixed source waste gas detection：HJ/T 397—2007[S]. Beijing：China Environmental Science Press，2007.
[21]	全国环保产业标准化技术委员会. 电除尘器性能测试方法：GB/T 13931—2017[S]. 北京：中国标准出版社，2017. National Standardization Technical Committee for Environmental Protection Industry. Performance testing method for electric dust collectors：GB/T 13931—2017[S]. Beijing：China Standard Press，2017.
[22]	IX-ISO. Stationary source emissions determination of mass concentration of particulate matter（dust）at low concentrations-manual gravimetric method：ISO 12141—2002[S]. 2002.
[23]	Inner Mongolia Huayang Energy Environmental Protection Technology Co.，Ltd. Performance test report on unit 8 of Zhejiang Zheneng Jiahua Power Generation Co.，Ltd. after electric dust removal renovation[R]. 2025. 内蒙古华洋能源环保科技有限公司. 浙江浙能嘉华发电有限公司#8机组电除尘改造后性能试验报告[R]. 2025.