| In recent years, as the city is still broadening the scope and increasing population, a direct result of increasing production of Municipal solid waste (MSW) and its proper disposition has become a very urgent task of environmental protection. Among many of today’s MSW disposal technologies, MSW incineration power generation technology with its various advantages and economic value is getting people’s attention from the world. However, since the conventional MSW incineration power generation techno--logy will produce large amounts of pollutants, which might be serious harm to the environment and the health of residents, and then the application and development of MSW incineration power generation technology is strictly limited. As a new emission reduction technology, O2/CO2combustion technology, with high combustion efficiency, low pollutant emissions, low cost of CO2capture and many other advantages have attracted wide attention. This technology can effectively reduce the production and emission of pollutants if it is applied to MSW incineration power generation. Compared to conventional air MSW incineration power generation, O2/CO2MSW combustion power generation technology is added with the air separation unit and the gas processing compression system, which greatly reduce the power generation efficiency of the plant, and have become key problems of its large-scale promotion and application.In this paper, an MSW incineration power plant in Shenzhen is taking as the original model, and the O2/CO2MSW combustion power coupling system optimization and economic evaluation as the main text. Aspen Plus process simulation software is used to establish the conventional air MSW incineration plant process model, the air separation model, the O2/CO2MSW combustion power system model, and the flue gas treatment compression system model. On this basis, the individual subsystems are coupled and connected to establish the O2/CO2MSW combustion plant process model and the optimization analysis and economic evaluation of the entire plant operating parameters are presented.Firstly, Aspen Plus software is used to build air MSW and O2/CO2MSW combustion power plant simulation models, and the simulation results are compared with the actual data to ensure the reliability of the model. With O2/CO2MSW combustion power generation plant-wide process simulation model, relations of the main parameters and the impacts of the different flue gas recirculation modes, the excess oxygen coefficient and the oxygen concentration at the O2/CO2combustion condition on system performance are discussed and analyzed.Subsequently, on the basis of O2/CO2MSW combustion power plant simulation model, each subsystem of O2/CO2MSW combustion model and the O2/CO2MSW combustion power plant simulation model are coupled and optimized. The results show that the flue gas processing compression system shares19.82%of total energy consumption, the air separation54.29%of the total energy consumption, and others25.89%of the total energy consumption. After using coupling optimization measures, the net power generation efficiency of the O2/CO2MSW combustion plant is2.69%.Finally, based on the data from the optimized O2/CO2MSW combustion power plant, the plant information of the MSW power plant and the market research data, the parameters of total cost of power plant, the annual total revenue annual plant, the power generation cost and other parameters are calculated for the conventional air and the O2/CO2MSW combustion power plants. In addition, the impacts of the economic performance of the incineration system by the CO2emission tax and sale income are taking into account, and that, compared with the conventional MSW power plant, the total investment is found increased about3.52percent for the O2/CO2MSW combustion plant, the reduction of annual gross income is about58.75percent. When taking into account issues of CO2tax and CO2sales, the annual gross profit of O2/CO2MSW combustion power plant increases by47.3percent. |
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