城市生活垃圾与园林废弃物的共热解特性

摘要

In order to realize the reduction and harmless resource utilization of municipal solid waste (MSW)and garden waste, co-pyrolysis experiment of the waste was carried out by a thermogravimetric analyzer (TGA)and a fixed bed reactor.The effects of different pyrolysis temperature, different proportion of pine and willow on the yield of the pyrolysis products were studied, and the pyrolysis tar was tested using gas chromatography-mass spectrometry (GC-MS).The results showed that the pyrolysis process of MSW, pine and willow can be divided into three stages: dehydration, pyrolysis and carbonization.The maximum weight loss rate of MSW, pine and willow appeared at 321.48, 358.23 and 377.83 ℃ , respectively.During the second stage of the pyrolysis reaction, the DTG curve of the co-pyrolysis of MSW and pine has two precipitation peaks at 342.32 ℃ and 471.48℃ , respectively.And compared with the pyrolysis of MSW, weight rate increased by 7.29％.When the adding amount of MSW, pine and willow was 3 ∶ 1, liquid product of the pyrolysis increased.The content of alcohols,carboxylic acids, aldehydes and other organic compounds containing oxygen in tar decreased and the calorific value increased.The content of oxygen in tar decreased, and pine had greater deoxidation effect on the co-pyrolysis tar, thus the quality of pyrolysis tar had been improved.%为实现城市生活垃圾减量化、无害化和资源化,采用热重分析天平和实验室固定床热解反应器进行城市生活垃圾(MSW)与园林废弃物共热解实验,研究了不同热解终温、松树枝和柳树枝添加比例对热解产物产率影响,并利用气质联用色谱分析仪(GC-MS)对热解油进行表征分析.实验结果表明:MSW、松树枝和柳树枝的热解过程均可以分为3个阶段,主要包括脱水、热解、炭化;MSW、松树枝和柳树枝单独热解时最大失重速率分别出现在321.48、358.23和377.83℃;MSW与松树枝共热解DTG曲线在热解反应第2阶段有2个析出峰,分别在342.32℃和471.48℃,比MSW单独热解时,失重率增加了7.29％.当城市生活垃圾与松树枝、柳树枝的添加量分别为3∶1时,热解液体产物产率明显升高,热解油中醇类、羧酸类、醛类等含氧有机物的含量降低,热值增加,热解油中氧含量降低,且松树枝对共热解焦油的脱氧效果更为显著,热解油品质得到提升.