Modeling Study on Non-Uniform Lateral Distribution in Large-Scale Circulating Fluidized Bed Boilers

With the development of the circulating fluidized bed (CFB) combustion technology, the cross-sectional area of the boiler furnace increases gradually, making the lateral non-uniform distribution in the furnace more prominent. To investigate the flow field inhomogeneity in the furnace, a two-dimensional mass balance model was established in this work, and the lateral solid concentration deviation was adopted to evaluate the degree of the flow field inhomogeneity. Afterwards, the effect of four factors on the lateral non-uniform distribution was examined. It turned out that the lateral profile of the primary air flow rate had a much greater influence than that of the coal feeding rate.