热力发电2023，Vol.52Issue(12)：79-89,11.DOI:10.19666/j.rlfd.202309142
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
摘要
Abstract
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Key words
heavy-duty combined cycle unit/heat recovery steam generator/off-design modeling/variable load operation/deep peak-shaving引用本文复制引用
王一丰,肖俊峰,胡孟起,夏林,李军,翟春华,黄庆,牛晨晖,苏新民,焦道顺,潘赫男,王乾远,孙魏..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[J].热力发电,2023,52(12):79-89,11.基金项目
华能国际电力股份有限公司科技项目(HNKJ20-H42) Science and Technology Project of Huaneng Power International Inc.(HNKJ20-H42) （HNKJ20-H42）
