System Simulation and Analysis of using Waste Heat of Flue Gas and Steam to Dry Municipal Solid Waste

Municipal solid waste incineration (MSWI) is currently the main method of harmless treatment of waste. The high moisture content of municipal solid waste (MSW) is one of the important reasons that affect the capacity of MSWI power plants. Therefore, this paper proposes a waste drying system which uses the waste heat of flue gas and steam to dry the MSW. This system includes a combined drying waste component built by Ebsilon software and is applied to MSWI power plants in China. Meanwhile, in order to make the power plant system more optimized, the original system is reformed from two aspects of steam extraction point and condensate return point, and four systems are put forward. Finally, the thermal economy of the four systems is compared and analyzed under pure condensing conditions, it is determined that the system with the extraction steam before the deaerator as the heat source and the return water before the heater is the best system for the waste drying power plant system. The efficiency of the whole plant has been increased from 22.8% of the original power plant system to 28.7%, bringing greater economic benefits to the MSWI power plants.