循环流化床U型回料阀的特性

Characteristics of U-type return valve of circulating fluidized bed

实验对循环流化床物料回送系统的关键部件--U型回料阀的工作特性进行了研究,具体研究了系统中循环流率与主床流化风速和松动风量的关系,以及通过改变U型阀横段开口尺寸,研究横段结构特征对U型阀返料特性的影响。当主床流化风速不变时,随着松动风量的增加,循环流率先线性增大,然后基本保持恒定;当松动风量一定时,系统的最大循环流率与主床流化风速基本为线性关系;实验中得出最佳孔口面积约为料腿截面面积的25%。

The investigation of U-type nonmechanical recycling valve is carried out on a cold-circulating fluidized bed(CFB) test facility. The size of the cross section of the valve is used to study the influence of the structural characteristics of the cross section on the return characteristics of the U-type valve. The influence of horizontal opening of U-valve on solids circulating rate are also studied. When the fluidizing gas velocity is constant, the solid circulating rate increases linearly first and then reaches constant. At a given loosing gas rate, the maximal circulating rate of system depends mainly on the fluidizing gas velocity. The optimized opening ratio of the horizontal section is about 25% cross section area of the standpipe.