固定床及流化床中橡胶颗粒气固传热的研究

Investigation on Heat Transfer between Gas and Rubber Particles in Fixed Bed and Vibrated Fluidized Bed

从分析固定床中的径向导热系数出发 ,对各参数对径向导热系数的影响进行了深入的分析 .结果表明 ,为降低橡胶颗粒低导热率对气固传热性能的不利影响 ,必须运用固定床的后一个发展阶段即流化床来完成气固间的换热过程 .对传热关系式的分析表明 ,振动流化床中气固传热受振动强度的影响更大 .同普通流化床相比 ,在达到相同的传热效果的情况下 ,振动流化床可以较大幅度地降低气流的速度 。

The effect of parameters on radial heat conductive coefficient is analyzed by researching into radial heat conductivity of rubber particles in fixed bed. The fluidized bed should be applied to enhance the process of heat transfer between gas and solids in order to minimize the effect of lower heat conductivity of rubber. It is indicated that vibration strengthen more than gas velocity affects heat transfer in vibrated fluidized bed (VFB) from the analysis of the correlations. In the case of reaching the same heat transfer results, the VFB can decrease gas velocity more than common fluidized bed can do, and energy conservation may be realized by using VFB technology.