Chlorine evolution characteristics during lab-scale combustion of MSW pyrolysis char obtained from 200 t/d pyrolysis demonstration plant

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-05-12 DOI:10.1016/j.wasman.2025.114882

Zhaotianyi Zhang , Ao Zhou , Guan Wang , Xinmin Wang , Shuanghui Deng , Songtao Sun , Renhui Ruan , Yongqiang Chen , Yili Zhang , Xuebin Wang

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引用次数: 0

Abstract

Pyrolysis is an effective method for treating municipal solid waste (MSW). Chlorine in MSW causes the production of dioxins, chlorine gas (Cl₂), hydrogen chloride (HCl) and some other chlorine-containing compounds, and these chlorine-containing compounds are also very harmful to the environment and human health. This study investigates chlorine evolution during the combustion of chlorine-rich MSW pyrolysis char obtained from a 200 t/d MSW pyrolysis demonstration (DEMO) project under industrial conditions. The speciation and distribution of chlorine within the MSW pyrolysis char were meticulously examined via X-ray fluorescence (XRF) spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses. The results indicate that the pyrolytic char contains 9.28 % chlorine, with 12.83 % as organic chlorine (organic-Cl) and 87.17 % as inorganic chlorine (inorganic-Cl). After combustion, the ash retains 5.65 % chlorine, all in the form of inorganic-Cl. During combustion, organic-Cl is released as HCl gas. Meanwhile, inorganic-Cl is converted to Cl₂ or evaporates as alkali metal chlorides. These chlorides later react with metal oxides to form HCl gas. Thermogravimetry-fourier transform infrared spectroscopy-mass spectrometry (TG-FTIR-MS) analysis indicates that organic-Cl dissociates as C-Cl and releases HCl between 220–320 °C and Cl₂ between 400 °C −550 °C. The microporous structure of MSW pyrolysis char significantly affects its combustion behavior. It facilitates the diffusion of chlorine-containing gases. Increasing pyrolysis temperature and time can reduce the chlorine content of MSW pyrolysis char. These findings provide valuable insights for MSW pyrolysis char reuse.

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200t /d热解示范厂获得的城市生活垃圾热解炭实验室燃烧过程中氯的演化特征

热解是一种处理城市生活垃圾的有效方法。城市生活垃圾中的氯会产生二恶英、氯气（Cl2）、氯化氢（HCl）和其他一些含氯化合物，这些含氯化合物对环境和人体健康也非常有害。本文研究了200 t/d城市生活垃圾热解示范（DEMO）项目中获得的富氯城市生活垃圾热解焦在工业条件下燃烧过程中氯的演化。利用x射线荧光光谱（XRF）和x射线光电子能谱（XPS）分析了城市生活垃圾热解焦中氯的形态和分布。结果表明：热解炭的氯含量为9.28%，其中有机氯（organic- cl）占12.83%，无机氯（无机- cl）占87.17%。燃烧后，灰分保留了5.65%的氯，全部以无机氯的形式存在。在燃烧过程中，有机cl以HCl气体的形式释放出来。同时，无机物cl转化为Cl2或蒸发为碱金属氯化物。这些氯化物随后与金属氧化物反应生成盐酸气体。热重-傅里叶变换红外光谱-质谱（TG-FTIR-MS）分析表明，有机cl在220 ~ 320℃之间解离为C- cl，释放HCl，在400 ~ 550℃之间释放Cl2。城市生活垃圾热解焦的微孔结构对其燃烧行为有显著影响。它有利于含氯气体的扩散。提高热解温度和时间可以降低生活垃圾热解焦的氯含量。这些发现为城市生活垃圾热解炭的再利用提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)