| The generation and collection of municipal solid waste(MSW)both grow faster with the rapid development of urbanization.The large yield of MSW will cause serious pollution to the environment if it is disposed improperly.And it is indispensable for urban sustainable development to solve the problem of MSW disposal effectively.MSW can be regarded as a renewable resource because it is mainly composed of organic components and contains a lot of hydrocarbons.The high-value utilization of gas can be obtained by using gasification technology to treat MSW,but the conventional gasification technology has the problems of low treatment efficiency,a large amount of tar in the gas and it is not conducive to the subsequent utilization of the gas.Recently,the thermal plasma gasification has received widespread attention for lower tar content,higher syngas yield,more efficient energy utilization and more environmentally friendly than conventional gasification.In this paper,four typical components of MSW and mixed materials(paper 8.5%,textile 25.1%,wood 51.6%,plastic 14.8%)were selected as raw materials.Plasma gasification technology was used to convert materials into hydrogen-rich gas by using steam as gasifying agent.Firstly,the thermogravimetry of the materials was analyzed by thermogravimetric analyzer.Then experiments of typical materials and mixed materials by plasma gasification were carried out to study the syngas properties of the gasification process.And then disposable feed experiments and continuous feed experiments of mixed materials were carried out to optimize the operating conditions of these process.The main conclusions were as follows:1.In TG/DTG experiment of materials,the results show that the main weight loss stage of the various components were all ranged from 250?to 512?.In this process,the weight loss rate of typical components all more than 75%and the result of mixed materials was 84.17%.The plastic in the mixed materials was beneficial to strengthen the cracking effect of the materials.2.Through disposable feed experiment of typical materials,the results show that the H2 yield of the four typical materials could reach high than 51.46(g H2/kg).The H2yields of typical materials of paper and plastics were 51.46(g H2/kg)and 68.56(g H2/kg).Textile and wood were 73.85(g H2/kg)and 73.97(g H2/kg),respectively.3.Through disposable feed experiment of mixed materials,the feed amount was set 300 g.The optimum operating conditions were as follows:the plasma power was16 k W,the flow rate of steam was 0.7 kg/h,the H2 yield was 70.88 g H2/(kg MSW),and the carbon conversion was 86.91%.4.The results of continuous feeding experiment show that when the plasma power was 16 k W,and the feedstock was 55-65g/min,the H2 content was 36.30-38.08vol.%,the CO content was 20.85-21.87 vol.%.The calorific value of the gas was 8.10-9.03 MJ/Nm3,and the N2 content is 29.44-31.56 vol.%. |
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