基于凝结水节流及热网蓄能的循环流化床供热机组变负荷性能研究  

Research on variable load performance of CFB heating unit based on condensate throttle and thermal network energy storage

作　　者：张开萍 高明明[1] 张洪福 王勇 马聪 魏光 岳光溪[3] ZHANG Kaiping;GAO Mingming;ZHANG Hongfu;WANG Yong;MA Cong;WEI Guang;YUE Guangxi(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(School of Control and Computing Engineering,North China Electric Power University),Beijing 102206,China;Huadian Power International Corporation Ltd.,Tianjin Development Area Branch,Tianjin 300270,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学控制与计算工程学院),北京102206 [2]华电国际电力股份有限公司天津开发区分公司,天津300270 [3]清华大学能源与动力工程系,北京100084

出　　处：《热力发电》2022年第4期47-54,共8页Thermal Power Generation

基　　金：华能集团总部科技项目“基础能源科技研究专项(二)”(HNKJ21-H31);山西省揭榜招标项目(20191101013);中国华电集团有限公司重大科技项目计划(CHDKJ19-01-88)。

摘　　要：为提高循环流化床机组的变负荷速率,基于火电机组锅炉侧和汽轮机侧响应存在差异,提出了基于凝结水节流和热网蓄能利用的快速变负荷方式。首先建立了抽汽系统以及汽轮机的机理模型,并计算了多个工况下负荷的理论值,验证上述模型的准确性;然后对抽汽系统蓄热进行分析,建立了基于凝结水节流的除氧器蓄热和热网蓄热定量计算模型,分析了影响循环流化床供热机组蓄热能力主要因素;最后提出了蓄热和负荷等响应特性。结果表明:循环流化床供热机组因存在冷渣环节,可调节凝结水流量受限,除氧器蓄热较煤粉炉更小;热网蓄热作为一个巨大的蓄热体,充分利用可提供可观的负荷提升,且短时间内的波动对于热网整体并无影响;除氧器蓄热和热网蓄热2种方式结合使用,在带供热工况下,变负荷时间可以缩短达4 min左右。In order to increase the variable load rate of circulating fluidized bed(CFB)units,a fast variable load method is proposed based on condensate throttling and heat network energy storage utilization according to the difference between the response of the boiler side and the steam turbine side of the thermal power unit.Firstly,the mechanism model of the extraction steam system and steam turbine is established,and the theoretical value of load under multiple operating conditions is calculated to verify the accuracy of the above model.Then,the heat storage of the extraction steam system is analyzed,and the quantitative calculation model for heat storage of deaerator and heat network is established based on condensate throttling.The main factors affecting the heat storage capacity of the CFB heating units are analyzed.Finally,the response characteristics of heat storage and load are put forward.The results show that,the CFB heating unit has limited adjustable condensate flow due to the slag cold link,and the heat storage of the deaerator is smaller than that of the pulverized coal furnace.The heat storage of the heating network is a huge heat storage body,its full utilization can provide a considerable load rise,and the short-term fluctuations have no effect on the overall heating network.The combination of the above two methods can shorten the variable load time by up to 4 minutes under heating conditions.

关 键 词：循环流化床 冷结水节流 除氧器蓄热 热网蓄热 抽汽系统 快速变负荷 

分 类 号：TK269.2[动力工程及工程热物理—动力机械及工程]