循环流化床锅炉燃烧室边界层的实验研究

循环流化床锅炉燃烧室的物料浓度影响传热和燃烧，在75t/h循环流化床锅炉上对燃烧室物料浓度分布的测量结果发现，循环流化床锅炉燃烧室的下降流边界层中在接近壁面处存在气体边界层，气体边界层的厚度与距离布风板高度有关，据此给出了下降流边界层厚度和气体边界层厚度的计算公式，并提出了循环流化床燃烧室双环模型。

Experimental Study of a Boundary Layer in the Furnace of a Circulating Fluidized Bed Boiler

The raw material concentration in the furnace of a circulating fluidized bed boiler may affect heat transfer and fuel combustion. By measuring the raw material concentration distribution in the furnace of a 75 t/h circulating fluidized boiler it was discovered that there exists near a wall surface a gas boundary layer in the down flow boundary layer of the above cited furnace. The thickness of the gas boundary layer varies with its distance from the air distribution plate height. On this basis a formula was given for calculating the thickness of the down flow boundary layer and the gas boundary layer. In addition, a double annulus model of the circulating fluidized bed boiler furnace is also proposed.