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Volume 41 Issue 2
Feb.  2023
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2023  >  41(2): 188-196,218
SUN Luqiang, DANG Xiaoqing, JI Shuo, LIU Xudong, WENG Yan, LI Xu, LI Shijie, WANG He. EXPERIMENTAL STUDY ON DIOXINS CONTROL DURING LOW-TEMPERATURE PYROLYSIS OF DOMESTIC WASTE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 188-196,218. doi: 10.13205/j.hjgc.202302025
Citation: SUN Luqiang, DANG Xiaoqing, JI Shuo, LIU Xudong, WENG Yan, LI Xu, LI Shijie, WANG He. EXPERIMENTAL STUDY ON DIOXINS CONTROL DURING LOW-TEMPERATURE PYROLYSIS OF DOMESTIC WASTE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 188-196,218. doi: 10.13205/j.hjgc.202302025
shu

EXPERIMENTAL STUDY ON DIOXINS CONTROL DURING LOW-TEMPERATURE PYROLYSIS OF DOMESTIC WASTE

doi: 10.13205/j.hjgc.202302025

  • 1. School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China;

  • 2. Inner Mongolia Aerospace Jingang Heavy Industry Co., Ltd, Hohhot 010000, China

  • Received Date: 2022-05-10
    Available Online: 2023-05-25
  • Publish Date: 2023-02-01
    Abstract
  • Based on the phenomenon of substandard dioxin emission from waste pyrolysis flue gas, this paper proposed a method of quantitative oxygen supply and stratified dioxin control based on the analysis of the waste pyrolysis and dioxin generation mechanism, used a combination of numerical analysis and experimental test to simulate the airflow organization inside the furnace and waste pyrolysis process, and discussed the effect of air supply on dioxin synthesis. The results showed that the overall distribution of airflow inside the pyrolysis furnace was relatively uniform, which ensured the stable pyrolysis of waste. The temperature stratification along the axial direction of the pyrolysis furnace was consistent with the theoretical analysis, but there was a dioxin synthesis atmosphere in the transition layer between the combustion layer and the pyrolysis layer; the measured results of the pyrolysis furnace temperature were in good agreement with the simulation results as a whole; a comprehensive comparison suggested that operation of the pyrolysis furnace with an air excess factor of 0.3 was more conducive to reducing dioxin generation, and the waste treatment capacity was 2.4 t/d. The field test result showed that, except for the particulate matter concentration exceeded the standard, the other conventional pollutants from pyrolysis furnace outlet flue gas and dioxin emission concentration met the Standard for Pollution Control of Domestic Waste Incineration (GB 18485-2014). The commercially available common furnace model dioxin outlet concentration was 0.44 ng-TEQ/m3, exceeding the national emission standard limit of 0.1 ng-TEQ/m3. The experimental results of the two furnace types proved that dioxin generation in the flue gas could be effectively suppressed by quantitative oxygen supply and stratified control on the basis of uniform gas distribution in the pyrolysis furnace. The study could provide a theoretical basis for the control of dioxins in low-temperature pyrolysis of domestic waste.
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