循环流化床锅炉内颗粒速度分布的实验研究

Experimental Study of Particles Velocity Distribution in Circulating Fluidized Bed Boiler

为了研究操作参数对循环流化床锅炉内颗粒速度分布的影响，在冷态模型装置上使用PV6A型颗粒速度光纤测量仪、毕托管对循环流化床锅炉炉膛内的颗粒速度进行了测量与分析。结果表明：在流化风速为2．57m／s、循环质量流率为0．58kg／（m^2·s）、一次风量为2300m^3/h、二次风量为1500m^3／h时，循环流化床锅炉炉膛内颗粒浓度分布、压降、流化状态、质量循环都达到一个较稳定的水平，呈现典型的环核分布特征。

In order to study the effect of operation parameter on the particles velocity distribution in the circulating fluidized bed boiler,the particle velocity in circulating fluidized bed furnace was measured and analyzed using PV6A particle velocity measuring instrument and pitot tube. The results showed that the distribution of particle velocity, pressure drop, fluid state and circulating presented a more stable level when the flow speed was 2.57 m/s, the quality of circulation flow rate was 0.58 kg/（m^2·s）, the first air flow was 2 300 m^3/h and the second air flow was 1 500 m^3/h. The circulating fluidized bed displayed a bubble area in the bottom,rapid flow area, eddy flow in upper part and a typical core-annulus distribution in the downward flow zone of sidewall.