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

SUN Luqiang; DANG Xiaoqing; JI Shuo; LIU Xudong; WENG Yan; LI Xu; LI Shijie; WANG He

doi:10.13205/j.hjgc.202302025

Volume 41 Issue 2

Feb. 2023

Turn off MathJax

Article Contents

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

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

PDF( 1590 KB)

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

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.
- domestic waste,
- low temperature pyrolysis treatment,
- numerical simulation,
- air distribution,
- dioxin control

FullText(HTML)

References(21)

References

[1]	中华人民共和国住房和城乡建设部. 中国城市建设统计年鉴(2020)[M]. 北京:中国统计出版社, 2021.
[2]	张国治, 魏珞宇, 葛一洪, 等. 我国农村生活垃圾处理现状及其展望[J]. 中国沼气, 2021, 39(4):54-61.
[3]	VAVERKOVÁ M D. Landfill impacts on the environment[J]. Geosciences, 2019, 9(10):431.
[4]	TITTO E, SAVINO A. Environmental and health risks related to waste incineration[J]. Waste Management & Research, 2019, 37(10):976-986.
[5]	桂莉. 农村生活垃圾热解污染物排放特征研究[D]. 广州:华南理工大学, 2014.
[6]	党小庆, 夏夕科, 吕涛, 等. 生活垃圾热解烟气净化设备研究与应用[C]//中国电除尘学术会议. 安徽, 2013.
[7]	黄付平, 黄智宁, 谢启军, 等. 低温热解耦合高压等离子体技术处理农村生活垃圾工程应用[J]. 环境工程, 2019, 37(5):196-199.
[8]	黄宇钊, 韩彪, 潘翠, 等. 新型稳定控制热解炉处理农村生活垃圾的应用[J]. 环境科技, 2020, 33(1):41-44.
[9]	雷鸣, 海景, 程江, 等. 小型生活垃圾热处理炉二噁英和重金属的排放特征[J]. 中国环境科学, 2017, 37(10):3836-3844.
[10]	孙宏宇, 董玉平, 周淑霞, 等. 基于Fluent的固定床生物质气化炉冷态压力场研究[J]. 农业机械学报, 2010, 41(11):94-97 ,104.
[11]	肖波, 汪莹莹, 周新平, 等. 基于烟气加热的新型垃圾热解气化炉热工特性数值模拟[J]. 环境工程, 2007,25(2):52-55.
[12]	MELLIN P, KANTARELIS E, YANG W. Computational fluid dynamics modeling of biomass fast pyrolysis in a fluidized bed reactor, using a comprehensive chemistry scheme[J]. Fuel, 2014, 117(pt.A):704-715.
[13]	陆杰, 金保昇. 生物质流化床气化的三维数值模拟[J]. 太阳能学报, 2018, 39(10):2863-2868.
[14]	VOGG H, METZGER M, STIEGLITZ L. Recent findings on the formation and decomposition of PCDD/PCDF in municipal solid waste incineration[J]. Waste Management & Research, 1987, 5(1):285-294.
[15]	CAI P T, FU J Y, ZHAN M X, et al. Formation mechanism and influencing factors of dioxins during incineration of mineralized refuse[J]. Journal of Cleaner Production, 2022, 342:130762.
[16]	JIE Y, LI X, MI Y, et al. Denovo tests on medical waste incineration fly ash:effect of oxygen and temperature[J]. Fresenius Environmental Bulletin, 2015, 24(2a):587-595.
[17]	ADDINK R, OLIE K. Role of oxygen in formation of polychlorinated dibenzo-p-dioxins/dibenzofurans from carbon on fly ash[J]. Environmental Science & Technology, 1995, 29(6):1586-1590.
[18]	TUPPURAINEN K, HALONEN I, RUOKOJÄRVI P, et al. Formation of PCDDs and PCDFs in municipal waste incineration and its inhibition mechanisms:a review[J]. Chemosphere, 1998, 36(7):1493-1511.
[19]	杨明辉, 陈祎, 刘金和, 等. PVC热解特性及Cl的析出过程研究[J]. 工业加热, 2020, 49(5):44-47.
[20]	田中训, 刘伟军. 聚氯乙烯废弃物的热解特性与处理[J]. 塑料, 2022, 51(1):121-126 ,130.
[21]	张睿智, 罗永浩. 用于低二噁英热化学转化过程的低温预先脱氯方法和装置:CN111330942A[P]. 2020-06-26.