Research And Optimization Design Of Mobile Biomass Fast Pyrolysis Reactor

Biomass energy has the characteristics of large reserves,wide distribution but low utilization.The mobile biomass fast pyrolysis equipment is able to go deep into forest farms,villages and other areas with rich biomass resources,and convert them into bio oil,combustible gas,pyrolysis carbon and other products.To some extent,it can solve the problems such as difficult collection of biomass raw materials and long transportation distance.The reactor is the core of the mobile fast pyrolysis equipment.Its design requirements are small volume,compact structure,low energy consumption,convenient transportation and mobile operation.In 2016,BJFU built a biomass fast pyrolysis equipment with a double pipe structure,which has a cylindrical fluidized bed reaction area in the inner tube,and an annular area between the inner and the outer tube,that can let the hot smoke through.On this basis,this paper explores the cold fluidization and heat transfer characteristics of the tubular fluidized bed reactor under different operating parameters,and carries out the structural optimization design.The main work are as follows:(1)A 1:1 fluidized bed cold state test device was built,and three-dimensional numerical simulation was carried out.The influence of different operating parameters on the cold state fluidization characteristics of the fluidized bed was explored by the method of experiment and numerical simulation.(2)The three-dimensional numerical simulation of the tubular fluidized bed reactor based on the Euler-Euler method is carried out,and the accuracy is verified by the experimental results.The influence of different operating parameters on the heat transfer characteristics in the fluidized bed is investigated.The influencing factors of the comprehensive heat transfer efficiency in the annular region are further analyzed by the analytical method,and the corresponding optimization scheme of the annular region structure is proposed.(3)The structure optimization of the double pipe fluidized bed reactor is proposed,and the structural parameters are calculated and the optimization effect is verified.