生活垃圾与柳树枝共热解研究

Study on co-pyrolysis of municipal solid waste and willow

在热重分析仪和固定床热解炉上进行柳树枝对生活垃圾热解特性影响研究,考察了柳树枝对生活垃圾热解失重率、热解活化能、热解产物产率、热解气组成的影响。热重分析结果表明,生活垃圾(M)、柳树枝(W)及生活垃圾和柳树枝混合物(MW)在265~600℃时失重最明显,当热解温度为600℃时,3种样品的失重率分别为61.41%,57.81%和70.31%;热解动力学分析表明,MW的热解活化能低于M和W,且低于MW理论活化能;固定床热解实验表明,当MW混合比例为4∶1时,热解产物理论值与实验值差距最大,M和W热解过程中存在明显协同作用;对MW热解气组成分析发现,随着W添加比例的增大,热解气体中CO_2产率下降,CH_4,H_2产率增加,当MW混合比例为4∶4时,CH_4和H_2产率分别提高1.13 m L/g和2.53 m L/g,CO_2产率降低1.68 m L/g。

The effects of willow （W） on pyrolysis characteristics of municipal solid waste （MSW） was investigated by means of thermogravimetric analysis and a fixed-bed reactor. The weight loss of samples, the activation energy of the samples, the yields of the pyrolysis products and the composition of pyrolysis gas were analysized. The results indicated that the most obvious weight loss temperature was 265~600 ℃ and the activation energy of MW （a mixture of M and W） was significantly lower than M, W and the theoretical value of MW, which indicated that a synergistic effect happened between M and W. When the pyrolysis temperature reached 600 ℃, the weight loss of M, W, MW were 61.41%, 57.81% and 70.31% respectively, and as the mixture ratio of MW was 4：1, the most significant gap of the pyrolysis products yield between the theoretical value and experimental value was reached. The composition analysis of the MW pyrolysis gas indicated that the yield of carbon dioxide decreased with the increased of W quality fraction, the methane and hydrogenthe yields increased with the increased of W quality fraction. When the mixtiure ratio of MW was 4：4, the yield of methane and hydrogenthe increased by 1.13 and 2.53 mL/g respectively and the yield of carbon dioxide decreased by 1.68 mL/g.