闭式生物质热压成型传热模拟

Simulation of heat transfer model of closed biomass thermo-compression formation

摘要:

根据生物质材料压缩过程发生弹塑性变形的特点，基于EDEM离散元分析软件，建立生物质热压过程中接触模型和传热模型，设计API接口二次开发程序，在不同模具直径和保压时间等工艺参数条件下对闭式生物质热压成型传热过程进行仿真分析.仿真结果表明：随着压缩量增加，成型过程传热加快，相同时刻大压缩量成型过程中生物质柱状燃料芯部温度较高；在相同压缩体积下，成型模具直径分别为10、20及30 mm时，随着模具直径增大，虽然模具与生物质燃料接触面积增大，但燃料芯部温度却呈现降低趋势；传热过程分析表明，合理设置成型后的保压时间对燃料成型效果及节能具有积极意义.

Abstract:

According to the characteristic of elastic-plastic deformation in the forming process, a model of contact and heat transfer in the closed biomass thermal compression process is established on the basis of EDEM discrete element analysis software. A program is developed based on the interface design of API, and a simulation analysis of closed biomass thermal compression is carried out under conditions of different die diameter and dwell time parameters. The simulation results show that with the increase of compression, the heat transfer of forming process is accelerated, and the core temperature of the largest compression column of biomass molding fuel is higher compared with the smallest one at the same time. With the die diameter increases from 10 mm to 20 mm and 30 mm, the core temperature of the biomass molding fuel decreases although the contact area of die and biomass fuel increases at the same compression volume. The reasonable setting of the holding time is significant to the fuel forming quality and energy saving.