Discussion on Principle of FLIC-FLUENT Combined Computer Intelligent Simulation Technology for Solid Waste Incinerator

Abstract

In China, the treatment of municipal solid waste (MSW) has become an urgent problem to be solved. The average daily domestic waste produced in big cities like Beijing, Shanghai, and Guangzhou has exceeded 20,000 tons. In the past, the incineration performance of waste incineration plants received little attention, but now the situation has changed completely. Waste combustion includes four processes: drying, devolatilization, gasification, and coke combustion. In the waste incinerator, the grate can thoroughly stir the waste through the reciprocating motion to make the waste fully contact with the air, which is conducive to the combustion of waste. With the rapid popularization of MSW incinerator and the speedy development of incinerator technology, the numerical simulation technology of MSW incinerator has attracted unprecedented attention. In order to describe the combustion process of waste on the grate in detail, Yang et al. establish the mass, momentum, and heat transfer control equations of solid and gas phases of the moving bed of MSW incinerator, and present the corresponding sub-models. Yang et al. develop the two-dimensional bed combustion simulation software FLIC, which combines with various sub-models to solve the control equations of solid and gas phases. Due to the channeling effect in the process of bed combustion, the mathematical modeling becomes very complex, so the FLIC software does not consider the channeling effect, and the calculation results of the software are in good agreement with the experimental results. Based on the FLIC software, Yang et al. develop the FLIC-FLUENT combined simulation technology of the MSW incinerator, which can simultaneously simulate the bed combustion on the grate and the airflow field above the bed, and simulate the influence of various design and operation parameters on the performance of the incinerator. The calculation results of the FLIC-FLUENT combined simulation technology are in satisfying agreement with the experimental results. This technology provides adequate reference data for the design and optimization of large-scale MSW incinerator.