中文摘要：

环流反应器的研究绝大多数都局限于气液、气液固系统,涉及气固环流反应器的研究较为稀少,且大多针对气升式气固环流反应器和喷动床。本文研究了一种处理A类粒子的环隙气升式气固环流反应器,考察了操作条件和导流筒分布器位置对床层密度分布、环流速度和质量流率的影响。发现将分布器位置下移后可以有效地改善区域的流化质量、减小滑移区,床层密度沿径向的分布得到了明显改善,颗粒环流质量流率有了明显提高;进气位置以上r/R〈0.367的床层得到了良好的流化,但是0.367〈r/R〈0.49处的床层密度依然很高,表明所采用的气体分布器型式影响范围有限,其结构有待改进;进气位置为32mm时颗粒环流速度和质量流率大于其他进气位置。

英文摘要：

Extensive research on air loop reactors（ALR）has been conducted,but mostly limited to gas-liquid and gas-liquid-solid systems.Work associated with gas-solid systems has been rare and mainly focused on draft tube-lifted fluidized bed and spouted bed.The present paper addressed a gas-solid air-loop reactor treating fine Geldart A particles and operating in a new annulus-lifted mode,with bubbling or turbulent bed upward flow in the annulus in parallel with bubbling bed downward flow in the draft tube.The influence of operating conditions and axial position of draft tube gas distributor on the distribution of bed density,particle circulation velocity and circulation mass flowrate is discussed.By mounting draft tube gas distributor in the bottom region,bed density radial distribution and particle circulation mass flowrate is significantly improved.Bed density in 0.367 r/R0.49 is still high,signifying a limited influence range and potential optimization of gas distributor.Particle circulation velocity and circulation mass flowrate for the axial position of 32 mm is greater than that for other axial positions.