循环流化床脱硫塔直_旋流复合流化下的两相流场试验研究

循环流化床脱硫装置的文丘里管直流流化速度随锅炉负荷的变化而变化，这会影响脱硫效率。本文提出了适应锅炉负荷变化的直／旋流复合流化方式，并用PDA测量系统对这种流化方式的气固两相流场进行测试，得到了循环流化床内旋流风率和假想切圆半径改变时气固切向速度和浓度分布。试验表明，复合流化循环流化床的切向速度随着半径增大而升高，气固切向滑移速度比直流流化增大，脱硫塔内的浓度增加，内循环增强，脱硫效率随之提高。

Experimental Study of Two-phase Flows under the Composite Fluidization of Desulfurizer Straight/rotating Flows in a Circulating Fluidized Bed

The Venturi straight-flow fluidization speed of a circulating fluidized bed desulfurizer will change with a change in boiler load.This has a negative influence on desulfurization efficiency.The authors have come up with a straight/rotating flow composite fluidization mode,which can adapt to boiler load variation.Moreover,a PDA(Phase Doppler Anemometer) measurement system was employed to test the gas-solid two-phase flow field under this kind of fluidization mode.As a result,the gas-solid tangential speed and concentration distribution were obtained under the condition of a change in swirl airflow and an imaginary tangential radius in the circulating fluidized bed.Test results indicate that the tangential velocity in the composite-fluidization circulating fluidized bed will increase with an increase in radius and the gas-solid tangential slip speed is higher than that of the straight flow fluidization.There will also be an increase in concentration in the desulfurizer and a higher intensity in internal circulation,resulting in a corresponding increase in desulfurizaion efficiency.