Tianjin University, School of Environmental Science and Technology/State Key Laboratory of Engines, China.
J Hazard Mater. 2010 Jun 15;178(1-3):489-98. doi: 10.1016/j.jhazmat.2010.01.108. Epub 2010 Jan 28.
Chlorine, as a key element causing high temperature corrosion and low efficiency in waste-to-energy plants, and its thermal behavior has widely drawn attention. In this study, the chlorine content in eight fractions of municipal solid waste (MSW) was quantified and characterized using five analytical methods. The influence of the operating temperature, and fuel additives like sulfur and silica on the volatilization of chlorine in combustion process was also investigated. The results showed: these fractions cover a wide range of chlorine content from 0.1 wt.% in wood to >6 wt.% in non-packaging plastics (dry basis). Polyvinylchloride (PVC) from packaging, electrical wire insulation etc. in plastics and chloride salts (mainly NaCl) in kitchen waste are the main sources of organic and inorganic chlorine. The increase of the operating temperature from 700 degrees C to 1000 degrees C has more influence on the HCl formation for kitchen waste than that for PVC. Sulfur addition leads to 20-40% higher HCl formation rate in most fractions. Silica supports the chlorine release at relatively low temperatures between 700 degrees C and 850 degrees C. These findings enhance to understand the thermal behavior of chlorine in MSW and RDF (refuse derived fuel) in waste-to-energy plants and lead to the suggestions for a fuel management for waste derived fuels in order to avoid chlorine induced corrosion.
氯是导致垃圾焚烧厂高温腐蚀和效率低下的关键元素，其热行为受到了广泛关注。本研究采用五种分析方法对城市固体废物（MSW）的八个部分中的氯含量进行了定量和特性描述。还研究了操作温度以及燃料添加剂（如硫和硅）对燃烧过程中氯挥发的影响。结果表明：这些部分涵盖了从木材中的 0.1wt.%到>6wt.%的非包装塑料（干基）的广泛氯含量范围。塑料中的包装用聚氯乙烯（PVC）、电线绝缘等和厨房垃圾中的氯化物盐（主要是 NaCl）是有机氯和无机氯的主要来源。操作温度从 700°C 增加到 1000°C 对厨房垃圾中 HCl 形成的影响比对 PVC 的影响更大。添加硫会导致大多数部分的 HCl 形成率增加 20-40%。在 700°C 到 850°C 之间的相对较低温度下，硅支持氯的释放。这些发现增强了对垃圾焚烧厂中 MSW 和 RDF（垃圾衍生燃料）中氯的热行为的理解，并为避免氯引起的腐蚀而对垃圾衍生燃料的燃料管理提出了建议。
