Design And Simulation Of Temperature Control System Of Biomass Gasification Hot-air Drying-kiln

Material drying is the major energy-consuming part in industrial & agricultural production process,so it's an urgent need to develop and use industrial drying equipment with renewable energy in drying industry.Through the study on biomass gasification technology,this thesis develops a Biomass Gasification Hot-air Drying-kiln(BGHD)system which combines with biomass gasification technology,biomass gas combustion technology and hot-blast drying technology.According to the instability of biomass gasification process in BGHD system and the material drying requirements for temperature control,a temperature drying control system of BGHD is designed by using optimized Fuzzy-PID control method based on PSO algorithm(PSO-FPID algorithm).This control system can maintain the temperature of drying-kiln within a preset range by adjusting the amount of gas into the gasification furnace,which can satisfy the drying requirements of agricultural products.The main contents of this thesis are as follows:1.Overall design of BGHD system: Firstly,the components and working principle of BGHD system are analyzed.And then the type selections of hot-blast stove and biomass gas burner of BGHD system are completed based on the drying requirements of BGHD system.Finally,the structure and parameters design of gasification furnace are completed by analyzing different structural types of gasification furnaces.2.Temperature control strategy and optimization algorithm design of BGHD system: By analyzing the energy-flow diagram of BGHD system,the key controlling factor that influences the drying-kiln's temperature is obtained,and the temperature control process of BGHD system is analyzed.According to the stability requirements for temperature control in drying-kiln,the temperature control performance of BGHD system is improved by using PSO-FPID algorithm.3.Modeling and simulation of BGHD temperature control system: The transfer function between blower frequency and drying-kiln's temperature is established by the means of experimental modeling.Setting up the corresponding simulation models of PSO-FPID control algorithm,Fuzzy-PID control algorithm and Classic-PID control algorithm by Simulink module in MATLAB software,and then judge the control effects of different controllers through the temperature response curve.4.Design of BGHD temperature control system: Lower machine chooses STM32 chip as the main controller of system to complete the detection of controlled object such as the temperature of drying-kiln,and to control executive device such as gasification furnace blower.The monitoring interface of upper machine is designed by using graphical programming tool LabVIEW to achieve the real time monitoring and control of the temperature data of drying-kiln and the working state parameters of blower.