Thermal-economic Analysis Of Low Temperature Pyrolysis High-temperature Gasification Combined Cycle Of Municipal Solid Waste

With the economic development and the continuous improvement of the socialindustrialization,municipal solid waste production has increased year by year,which will doserious harm to the environment if not properly disposed of.Traditional waste disposalmethods like landfill,composting and incineration,can only deal with limited amount ofwaste,have long processing cycles or easily produce secondary pollution.A low temperaturepyrolysis and high temperature gasification approach is proposed in this thesis.Municipalsolid waste was processed with anaerobic pyrolysis and gasification under200-300degrees.Due to dechlorination of pyrolysis gasata low temperature,high temperaturecorrosion caused by the process gas behind can be reduced;after pyrolysis chargrindability isgreatly improved,which is also more conducive to gasification.In this thesis,parameters of system flow streams are acquired by modelin g lowtemperature pyrolysis high-temperature gasification combined cycle and traditional wasteincineration of the municipal solid waste with the aid of Aspen Plus software. Exergy loss ofthe two systems was analyzed with the exergy analysis method,showing overall exergyloss of pyrolysis and gasification combined circulation system is10%lower thanconventional incineration systems.The largest part of exergy loss of incineration system isthe incinerator, accounted for76.61%of all exergy loss,pyrolysis and gasification combinedcycle produces exergy with the biggest losses in the gas turbine part, accounted for37.68%of all exergy loss. Subsequent thermal economic analysis was done to the two systems withmatrix thermal economics the traditional incineration system power generation costs0.202￥/kW h, low temperature pyrolysis temperature gasification combined cycle powergeneration costs0.312￥/kW h.. This indicates that compared with traditionalincineration system, the low temperature pyrolysis temperature gasification combinedcirculation system has higher energy utilization，the unit cost of power generation is higherthan traditional incineration systems.