Construction And Analysis Of Numerical Simulation Model For Municipal Solid Waste Incineration Process

With the development of economy,the production of municipal solid wastes(MSW)is increasing day by day.The use of MSW Incineration(MSWI)technology is also expanding,but its process is a multi-input and multi-output nonlinear dynamic process,involving complex physical and chemical reactions and interaction between multiple factors,and it is difficult to establish a mechanism model.The combustion state changes with the fluctuation of the physical and chemical properties of the feed,and it is difficult to understand the combustion state in the furnace.These factors lead to the operation of MSWI power plant with experienced operators using manual control of "air distribution and feeding",and its efficiency needs to be improved.Therefore,the numerical simulation model of the MSWI process is constructed and analyzed for research,in order to further understand the operating characteristics of the MSW incinerator,master the combustion laws under different working conditions,obtain theoretically optimized operating parameters,and provide support for the control and optimization of the MSWI process.Significance.In order to solve the above problems,the numerical simulation of the combustion process of gas phase components in the incinerator furnace based on computational fluid dynamics software,the numerical simulation of the combustion process in the furnace based on the coupling of the solid phase of the grate and the gas phase of the furnace,and the numerical simulation of the whole process of MSWI based on multi-software coupling simulation.The main research work of this thesis includes the following aspects:(1)Aiming at the lack of analysis of the influence mechanism of the secondary air velocity of the introduced MSWI system on the temperature distribution in the incinerator,a numerical simulation of the combustion process of gas phase components in the furnace based on computational fluid dynamics software was carried out.Firstly,the required numerical simulation method,numerical simulation model and boundary conditions are introduced,and then the numerical simulation results under the benchmark condition are verified based on the actual operation data of the plant.Incineration effect.This result can support the optimal setting of the secondary air velocity in the incinerator chamber.(2)Aiming at the problem that the embedded model of computational fluid dynamics software is difficult to simulate the solid-phase urban solid waste combustion process on the grate and the lack of research on the combustion mechanism in the furnace with the input of air distribution and feeding,the research based on the solid-phase and furnace chamber of the grate is carried out.Numerical simulation of gas-phase coupled furnace combustion process.Firstly,the required numerical simulation method and boundary conditions are given,and then the numerical simulation results under the benchmark condition are verified based on the actual operation data of the factory.Finally,the grate speed and the ratio of the first and second air under the non-benchmark condition are analyzed.Influence on the incineration effect in the incinerator.The results can support the optimal setting of the grate speed and the first and second air ratios in the incinerator.(3)Aiming at the problem that it is difficult to numerically simulate the whole process of MSWI from a microscopic and macroscopic perspective based on a single numerical simulation software and the lack of research on the mechanism of flue gas emission with air distribution and feed as input,the whole process of MSWI based on multi-software coupling is carried out.Numerical simulation research,firstly,the coupling strategy and coupling implementation method of numerical simulation are given,and then the numerical simulation results under the benchmark condition are verified based on the actual operation data of the factory,and finally the grate speed and the first and second wind under non-benchmark conditions are analyzed.The influence of matching on the whole process of MSWI.This result can support the optimal setting of the grate speed and the ratio of the first and second air in the whole process of MSWI.peration data of the factory;The influence of grate speed and the ratio of primary and secondary air on the whole process of MSWI under non-baseline conditions.