热力发电2024，Vol.53Issue(10)：134-143,10.DOI:10.19666/j.rlfd.202403056
燃煤机组脱硫浆液循环泵定频运行控制策略优化及节能分析
Control strategy optimization and energy saving analysis for slurry circulation pumps in fixed-frequency mode of desulfurization system in coal-fired power units
摘要
Abstract
To accommodate grid-connected large-scale renewable power,coal-fired power plants need to undertake more peak shaving and frequency regulation tasks,so it will engage in the processes of deep peak shaving and load cycling for a long time.In this situation,the performance of wet flue gas desulfurization system(WFGD)will degradation and the auxiliary power consumption will increase significantly.To solve this problem,the dynamic model of an ultra-supercritical 660 MW coal-fired power unit and the dynamic model of the WFGD system based on the double-membrane theory are established.The performance of the desulfurization system is simulated when the slurry circulation pumps are switched under different operating conditions during the load cycling processes.It is found that the precise matching of slurry and flue gas during load cycling processes can achieve the minimum power consumption of the desulfurization system while meeting the SO2 emission standard.Furthermore,when the slurry circulation flowrate changes stepwise during load cycling processes,the prediction model of changes in SO2 mass concentration at the WFGD system outlet is obtained.An optimization control strategy for the slurry circulation pumps in fixed-frequency mode is proposed,which can achieve the best match between the slurry and flue gas during load cycling processes.Finally,the energy saving potential for the proposed control strategy is analyzed.When the load cycling rates are 1.0%,1.5%and 2.0%Pe/min,the energy saving potential is 20.12%,21.52%and 22.82%during loading down processes from 75%THA to 50%THA conditions,and that value will be 10.04%,9.90%and 8.66%during loading up processes,respectively.The difference in flue gas flowrate during load cycling processes is found as a key factor causing the disparate of energy saving potential during loading down and loading up processes.关键词
湿法脱硫/浆液循环泵/燃煤机组/控制策略优化/节能分析Key words
wet flue gas desulfurization/slurry circulation pumps/coal-fired power unit/control strategy optimization/energy saving analysis引用本文复制引用
高伟,刘明,赵永亮,王朝阳,严俊杰..燃煤机组脱硫浆液循环泵定频运行控制策略优化及节能分析[J].热力发电,2024,53(10):134-143,10.基金项目
国家重点研发计划(2022YFB4100402) National Key R&D Program of China(2022YFB4100402) （2022YFB4100402）
