低负荷吹灰对超临界锅炉水冷壁超温影响的试验研究

通过对低负荷段吹灰器投运位置、频次、负荷段及对应区域配风方式的试验研究，发现低负荷段吹灰器投运时明显的壁温突升主要发生在两侧墙，且投运燃尽风上下位置的吹灰器影响较大，最高壁温突升幅度约100~130 ℃。吹灰过程中增大对应区域的辅助风门开度约20%，壁温突升幅度可降低约20 ℃，同时，选择较高负荷段投运吹灰器以及降低吹灰器的投用频次对控制水冷壁超温有利。试验研究方法与结论对同类型机组低负荷段吹灰器投运具有一定的参考意义。

Experimental Studies on the Influence of Soot Blowing on the Overheating of Water Wall Pipes under Low Loads in Supercritical Boilers

In this paper, through the experimental studies on the installation location, operation frequency, time period of load section and corresponding wind distribution mode of the soot blowers under low loads, it is observed that the sudden rise of wall temperature mainly occurs on the two side walls during soot blowing under low loads, and particularly the ash blowers above and under the overfire air port have substantial effects with the maximum temperature surge amplitude of about 100~130 ℃. In the process of ash blowing, with the auxiliary air volume increased by about 20% in the corresponding area, the temperature surge amplitude can be reduced by about 20 ℃. At the same time, choosing the time section of higher load for soot blowing and reducing the operation frequency of the soot-blowers are also helpful for the control of the water wall overheating. The experimental research method and conclusions have appeared to have certain referential significance to the soot-blower operation of units with the same type under low load conditions.