China Energy Shouguang power generation Co., Ltd.;State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission, China Energy Science and Technology Research Institute Co., Ltd.;Xi'an Jiaotong University;
[Objective] In order to study the characteristics of combustion instability and hydrodynamic changes caused by coal-fired boilers participating in deep peak shaving when the boiler is in a low-load state, and to improve the safety of boiler operation, [Methods] In this paper, a 670 MW supercritical boiler is taken as the research object. The internal combustion condition of the boiler is numerically simulated. At the same time, combined with the hydrodynamic characteristics calculation based on the component pressure method, the hydrodynamic characteristics of the water wall of the boiler under the maximum continuous evaporation condition of the 100% boiler and the low-load 40% heat consumption rate acceptance condition are analyzed. [Results] The results show that the mass flow rate distribution trend of each loop of the vertical water wall in the upper part of the boiler under the two working conditions is similar, and both show negative flow response characteristics. Under the condition of maximum continuous evaporation of 100% boiler, the maximum temperature of each loop of vertical water wall is 392.75 ℃, the maximum temperature difference is 8.75 ℃, the deviation of steam temperature is not large, and the operation of water wall is safe. Under the condition of low load 40% heat rate acceptance, the working medium at the outlet of the water wall is in the two-phase region, and the temperature of each loop is 330.55 ℃ under the corresponding pressure. There is no over-temperature phenomenon, and the water wall can operate safely. [Conclusion] According to the characteristics of negative flow conditions, it is suggested to adopt more refined flow control mode or optimize the layout of boiler water wall pipes. For the case of small mass flow rate of the back wall, special attention should be paid to the cooling effect of the back wall during operation.
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Basic Information:
DOI：10.19944/j.eptep.1674-8069.2025.02.014
China Classification Code:TM621.2
Citation Information:
[1]谢军,侍述成,王磊等.超临界燃煤锅炉低负荷水冷壁水动力特性研究[J].电力科技与环保,2025,41(02):312-322.DOI:10.19944/j.eptep.1674-8069.2025.02.014.
Fund Information:
国家重点研发计划项目(2024YFB4104901)