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

doi:10.11930/j.issn.1004-9649.202003111

Abstract

Abstract: 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.

Key words: supercritical boiler, soot blowing, water wall, overtemperature, low load

WANG Yang, ZHU Xiaoxin, CHEN Ming, WANG Huajian, FANG Fan, ZHU Weijian. Experimental Studies on the Influence of Soot Blowing on the Overheating of Water Wall Pipes under Low Loads in Supercritical Boilers[J]. Electric Power, 2020, 53(11): 227-233.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202003111

https://www.electricpower.com.cn/EN/Y2020/V53/I11/227

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