Study on the combustion characteristics of |the sludge from leather industry, paper industry and lake
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摘要: 利用热重分析法对城市湖泊污泥、制革污泥，以及两种造纸污泥进行了实验研究，并分析了污泥的燃烧特性。结果表明，四种污泥都具有高挥发分、高灰分、低热值的特点。污泥的燃烧分为挥发分燃烧和固定碳燃烧两个阶段，除了制革污泥在两个阶段失重份额相当外，湖泊污泥和造纸污泥的挥发分燃烧阶段失重都超过燃烧总失重的70%，表明挥发分是污泥中的主要可燃成分，而且挥发分和燃烧过程温度范围比较宽。污泥的挥发分燃烧DTG峰有明显的多峰叠加现象，表明污泥的挥发分析出组分较为复杂。运用Coats-Redfern积分法进行动力学分析后表明，大部分污泥的燃烧过程为二级反应，污泥燃烧的活化能较低。Abstract: The combustion characteristics of sludge samples including paper mill sludge, lake sludge and tannery sludge were investigated by using thermogravimetric analysis(TGA). The sludge tested had high volatile, high ash and lower calorific value. The results show that the combustion process of sludge can be divided into two stages. The first stage is the release and combustion of the volatile matter in sludge, and the second is the combustion of the fixed carbon. The weight loss for both combustion of volatile and fixed carbon for tannery sludge is almost equal, while the weight loss by the combustion of volatile accounts for more than 70% of total for lake sludge and paper mill sludge. It is indicated that the main combustible matter in sludge is the volatile matter, and the volatile is combusted in a wide temperature region (from 200℃ to 600℃). The overlapping phenomenon of peaks of the weight loss during the combustion reflects the complexity of the volatile matter in the sludge. Moreover, the reaction kinetics of the combustion of sludge was studied by the integration method of CoatsRedfern.
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Key words:
- sludge /
- combustion characteristics /
- kinetics /
- thermogravimetric analysis /
- activation energy
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