加压导向管喷动流化床部分气化炉颗粒循环倍率的研究

Research on Solids Circulation Rates in Pressurized Spout-Fluid Bed with a Draft Tube Gasifier

以宽筛分的灰渣和 2种不同粒径的窄筛分玻璃珠为实验原料 ,对加压导向管喷动流化床部分气化炉内颗粒循环倍率进行了试验研究。提出了导向管喷动流化床颗粒循环倍率和床内压降理论关系 ,分析了环形区的充气量在不同系统压力、导向管位置和喷动管直径对颗粒循环倍率增加因子的影响 ,在此基础上提出了预测颗粒循环倍率增加因子的试验关联式。结果表明 :环形区充气后不仅改善了环形区的气固接触 ,而且显著增加了环形区和喷动区的颗粒交换 ,有利于床内气固非均相反应的进行。图 1 0表 1参 1

An experimental study on solids circulation rates was performed in a pressurized spout fluid bed with a draft tube gasifier. Two different particles diameters glass beads with narrow particles size distributions and one bottom ash with wide particles size distributions were used as bed materials to investigate the effect of auxiliary flow rates in the annulus at different draft tube positions, operating pressures, particle types and spouting orifice diameters on the solids circulation rate enhancement factor. A novel technique has been developed to measure the solids fluxes under pressure conditions. The relationship between pressure drop across the draft tube and the annulus and the solids circulation rate was analyzed and an experimental correlation for presenting solids circulation rate enhancement factors caused by adding auxiliary flow in the annulus was proposed. The experiment showed that the solids circulation rate was greatly enhanced and the solids gas mixing in the annulus was improved when an auxiliary flow aerated the annular region, which favored the heterogeneous reaction in the gasifier. Figs 10, table 1 and refs 10.