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Characteristics of Electrostatic Precipitator Ash and Bag Filter Ash From a Circulating Fluidized Bed Municipal Solid Waste Incinerator

LI Wenhan1 MA Zengyi1 YANG Enquan1 CAI Yaming1 CHEN Zhe1 GAO Ruofeng1 YAN Jianhua1 CAO Xifa2 PAN Enjun2

(1.State Key Laboratory of Clean Energy Utilization (Zhejiang University) , Hangzhou, Zhejiang Province, China 310027)
(2.Hangzhou Xiaoshan Urban Green Energy Co., LTD., Hangzhou, Zhejiang Province, China 311225)
【Knowledge Link】circulating fluidized bed; dioxin

【Abstract】Electrostatic precipitator (ESP) ash and bag filter (BF) ash from a circulating fluidized bed (CFB) municipal solid waste (MSW) incineration power plant in Zhejiang Province were sampled as the research objects. Particle size distribution, surface characteristics, mineral composition, heavy-metal content, and leaching characteristics of ESP ash and BF ash were systematically studied. Results show that1) the particle size distribution of ESP ash and BF ash displayed unimodal distribution, which were mainly distributed in the ranges of 9.8–120.6 μm and 3.8–78.8 μm respectively; 2) the fly ash particles had negligible porosity and the adsorption of heavy metals mainly took place on the exposed surfaces of ESP ash and BF ash; 3) the main mineral composition of ESP ash was SiO2, whereas BF ash primarily consisted of SiO2, Ca(OH)2, CaCO3, NaCl, and KCl; 4) Cd and Hg were transferred into fly ash by evaporation, condensation and adsorption, whereas Se was transferred into fly ash by chemical adsorption; As and Cr were transferred into the fly ash mainly by entrainment, whereas Pb, Cu, and Zn were transferred into the fly ash mainly in the form of chlorides by evaporation, condensation and adsorption; 5) Cd, Cu and Zn in fly ash showed high leachability, while the leaching rates of Cr Hg and Se were relatively low.

【Keywords】 municipal solid waste (MSW) ; circulating fluidized bed (CFB) ; incineration; electrostatic precipitator (ESP) ash; bag filter (BF) ash; fly-ash characteristics; heavy metals;

【DOI】

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This Article

ISSN:0258-8013

CN: 11-2107/TM

Vol 39, No. 05, Pages 1397-1405

March 2019

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Abstract

  • 0 Introduction
  • 1 Experimental material and method
  • 2 Results and discussion
  • 3 Conclusion
  • References