State Key Laboratory of Renewable Energy Power System, North China Electric Power University
School of Control and Computer Engineering, North China Electric Power University

近年来热电联产机组在燃煤机组中的比重增加,而火力发电渐渐承担调峰重任,灵活性需求增强,提高热电联产机组的变负荷能力对于深度调峰具有重大意义。热电联产循环流化床(CFB)机组可利用锅炉汽水侧和热网蓄热提高机组快速变负荷能力,因此提出一种超临界热电联产CFB机组汽水侧蓄热和热网蓄热的定量计算方法。以某350MW热电联产CFB机组为例,分析该机组汽水侧工质流程和热网抽汽及循环水分析,结合机组设计参数与历史运行数据,计算不同负荷(35%~90%)工况下锅炉汽水侧蓄热系数Csw和热网蓄热系数Ch,进一步分析机组负荷响应特性及蓄热利用可持续时间。结果表明:随着机组负荷增大,汽水侧蓄热系数Csw增大,且在机组高负荷阶段汽水工质蓄热Csw变化较大,而热网蓄热系数Ch几乎不变;机组蓄热利用可持续时间与机组负荷成正比,与机组变负荷速率成反比;热网蓄热利用可持续时间大于汽水侧蓄热,且热网蓄热能力几乎不随机组负荷变化而变化;在4%/min变负荷速率下,热网蓄热利用可持续时间约285s,而汽水侧蓄热利用可持续时间161.5~249.7s。表明在机组参与深度调峰期间,热网蓄热可提供更稳定的变负荷能力。以上计算结果为超临界热电联产CFB机组深度调峰及快速变负荷运行提供理论指导。

In recent years, the proportion of cogeneration units in coal-fired units has increased, and thermal power generation has gradually assumed the heavy responsibility of peak regulation, and the demand for flexibility has increased. Combined heat and power circulatingfluidized bed (CFB) units can use boiler steam-water side and heat network heat storage to improve the rapid variable load capacity of theunit, so a quantitative calculation method for steam-water side heat storage and heat network heat storage of supercritical cogenerationCFB units was proposed. Taking a 350 MW cogeneration CFB unit as an example, the working fluid flow on the steam-water side of theunit and the steam extraction and circulating water of the heat network were analyzed. The heat storage coefficient C and the heat networkheat storage coefficient C were calculated under different load conditions (35% ~90%) by combining the design parameters and historicaloperation data of the unit, and the load response characteristics of the unit and the sustainable time of heat storage utilization were furtheranalyzed. The results show that with the increase of the load of the unit, the heat storage coefficient C of the steam-water side increases,and the C of the steam-water working fluid changes greatly in the high load stage of the unit, while the heat storage coefficient C of theheat network is almost unchanged. The sustainable time of heat storage utilization of the unit is directly proportional to the load of the unitand inversely proportional to the variable load rate of the unit. The sustainable time of heat storage utilization of heat network is greaterthan that of steam and water side, and the heat storage capacity of heat network almost does not change with random group load changes.At the variable load rate of 4% / min, the heat storage utilization of the heat network can last for about 285 s, while the heat storage utilization on the steam side can last for 161.5-249.7 s. The above calculation results can provide theoretical guidance for the deep peak regulation and rapid variable load operation of supercritical cogeneration CFB units.

国家重点研发计划资助项目(2022YFB4100301)

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WANG Weihua,GAO Mingming,WANG Yongquan,et al.Load response characteristics of 350 MW cogeneration CFB unit[J].Clean Coal Technology,2024,30(9):102-110.