带隔墙的600MW超临界循环流化床锅炉水冷壁水动力特性

Hydrodynamics of the Water Wall in a 600 MW Supercritical Circulating Fluidized Bed Boiler With Water Cooled Panels Within the Furnace

对带隔墙的600MW超临界循环流化床锅炉水冷壁进行水动力特性及方案选型研究。基于二分法对炉膛水冷壁进行水动力特性计算,得到了采用光管水冷壁加节流圈结构时各负荷下水冷壁出口工质温度及壁温参数。在100%锅炉最大连续工况时,水冷壁工质质量流率低于1000kg/(m2?s)时可以保证出口温度在422℃以下,热偏差位于允许范围内。在75%与50%汽轮机验收工况负荷时水冷壁均未发生传热恶化现象。通过与内螺纹管布置方案计算结果比较,认为采用内螺纹管改善了壁温特性,但对热偏差的改善并没有明显效果。因此对于600MW超临界循环流化床锅炉,采用光管水冷壁加节流圈结构是可行的。

The hydrodynamics of the water wall in a 600 MW circulating fluidized bed （CFB） boiler was studied, and water cooled panels were deposited in the furnace. The mass flow rate and the temperature distribution of the water wall with throttles within the smooth tubes was discussed. It was found that the outlet temperature of water wall is less than 422 ℃, when the mass flow rate is below 1000 kg/（m2-s） at the load of 100% boiler maximum continuous rating （B-MCR）. And heat difference can be controlled within 2%. At the load of 75% turbine heat acceptance （THA） or 50%THA, the wall temperature is also not too high to be allowed. Compared with the ribbed-tube, the usage of them can reduce the water wall temperature but no good to the heat deviation. Smooth tube with throttle is better than ribbed tube in the 600 MW supercritical CFB boiler.