大功率燃气轮机联合循环机组三压再热余热锅炉建模及变负荷运行规律研究  

Off-design modeling of heat recovery steam generator in heavy-duty gas turbine combined cycle unit and variable load operation research

作　　者：王一丰 翟春华[3] 黄庆 牛晨晖 苏新民 焦道顺 潘赫男 王乾远 孙魏 肖俊峰 胡孟起[1] 夏林 李军 WANG Yifeng;ZHAI Chunhua;HUANG Qing;NIU Chenhui;SU Xinmin;JIAO Daoshun;PAN Henan;WANG Qianyuan;SUN Wei;XIAO Junfeng;HU Mengqi;XIA Lin;LI Jun(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Huaneng Nanjing Gas Turbine Power Plant Co.,Ltd.,Nanjing 210034,China;Huanneng Jiangsu Energy Development Co.,Ltd.,Nanjing 210015,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]西安交通大学能源与动力工程学院,陕西西安710049 [3]华能南京燃机发电有限公司,江苏南京210034 [4]华能江苏能源开发有限公司,江苏南京210015

出　　处：《热力发电》2023年第12期79-89,共11页Thermal Power Generation

基　　金：华能国际电力股份有限公司科技项目(HNKJ20-H42)。

摘　　要：建立了大功率燃气-蒸汽联合循环三压再热余热锅炉热力性能Python编程模型,模型计算了在变负荷条件下的余热锅炉详细热力性能,包括主蒸汽压力和流量、各换热器的换热量和换热系数、以及功率和效率,分析了烟气温度和流量对余热锅炉热力性能的影响,探讨了在机组部分负荷下环境温度、湿度和燃料加热温度如何影响余热锅炉出力。模型经过验证具有较高的仿真精度和计算效率。以某型燃气轮机联合循环机组为研究对象计算表明:当机组负荷从满负荷650 MW降低到部分负荷250 MW后,余热锅炉三压主蒸汽压力和给水流量降低,汽轮机输出功率从219.1 MW减小到了130.4 MW,而余热锅炉效率从89.3%升高到了92.1%;随三压再热余热锅炉入口烟气流量和温度升高,余热锅炉的三压主蒸汽流量都升高;随机组负荷降低,余热锅炉各换热面的换热系数和换热量减小,但是烟气与高温段换热器的换热量在总换热量中的占比升高,烟气与低温段换热器的换热量在总热量中的占比降低;当机组负荷从650 MW降低到300 MW时,在余热锅炉输出能量中,汽轮机轴功率的占比增大了1.67%,烟囱烟气热损失的占比减小了2.63%。A Python model was established for thermal performance of the heavy-duty gas-steam combined cycle triple-pressure heat recovery steam generator.The model calculates the detailed heat recovery steam generator parameters under the condition of changing unit load,including main steam pressure and flow rate,heat and heat transfer coefficient of each heat exchanger,as well as power output and efficiency.As the effect of exhaust gas temperature and flow rate on the heat recovery steam generator is analyzed,how the ambient temperature,humidity and fuel heating affect the heat recovery steam generator output is also discussed when the unit is in part-load.It is verified that the model has good simulation accuracy and calculation efficiency.Simulations for one certain frame gas turbine combined cycle show that:When the unit load is reduced from full load 650 MW to partial load 250 MW,the triple main steam pressure and feed water flow rate of heat recovery steam generator decrease,the steam turbine power output decreases from 219.1 MW to 130.4 MW,and the efficiency of heat recovery steam generator increases from 89.3%to 92.1%;main-steam flow increases as the flue gas flow rate and temperature increase at the inlet of heat recovery steam generator;As the load of the random group decreases,the heat transfer coefficient and heat transfer amount of each heat exchange surface of the waste heat boiler decreases,but the proportion of heat exchanger between the flue gas and the high-temperature section heat exchanger in the total heat increases,and the heat transfer between the flue gas and the low-temperature section increases.The proportion of heat exchanger heat transfer in the total heat is reduced;when the unit load is reduced from 650 MW to 300 MW,the proportion of steam turbine shaft power increases by 1.67 percentage points,the proportion of heat loss in the chimney flue gas decreases by 2.63 percentage points.

关 键 词：重型联合循环机组 余热锅炉 变工况模型 变负荷运行 深度调峰 

分 类 号：TM611.31[电气工程—电力系统及自动化] TK229.929[动力工程及工程热物理—动力机械及工程]