摘要
为了探究空气湿度对燃气轮机的影响,针对GE公司PG9351FA型重型燃气轮机机组建立了两种热力模型用于分析并优化燃气轮机热力参数设计,通过修正拟合公式进行热力计算,加入压气机变工况模型后分析了湿度变化对机组性能影响。结果表明:只考虑湿度变化时,湿度增加会使机组发电量由最初的256 959 kW降低至254 674 kW,降幅近1%;机组效率由37.10%降至36.77%;透平排气温度由881.00 K升至882.74 K,变化较缓;透平冷却空气量占比接近20%,其中一级静叶冷却空气量达总冷却空气量50%以上;空气、燃料和ISO模型燃气比热比分别为1.388 5,1.251 6和1.304 9,透平各级燃气比热比分别为1.289 9,1.308 5和1.322 4。两种模型计算误差均在工程可接受误差范围内。
In order to investigate the influence of air humidity on gas turbine,this paper established two kinds of thermal models for GE PG9351FA heavy-duty gas turbine unit to analyze and optimize the design of thermal parameters of the gas turbine,and analyzed the influence of humidity change on the perform-ance of the unit by correcting the ftting formula for the thermal calculation after adding the model of the compressor under variable working conditions.The results show that when only considering the humidity change,its increase will reduce the unit power generation from the initial 256959 kW to 254674 kW,with a decrease of nearly 1%;the unit efficiency decreases from 37.10%to 36.77%;the turbine ex-haust temperature rises from 881.00 K to 882.74 K,with a slower change;the proportion of cooling air volume in the turbine is nearly 20%,in which the cooling air volume in the first stage stator blade rea-ches more than 50%of the total cooling air volume;the specific heat ratios of air,fuel and ISO model gas are 1.3885,1.2516 and 1.3049,respectively,and the specific heat ratios of gas at all stages of the turbine are 1.2899,1.3085 and 1.3224,respectively.The calculation errors of the two models are within the acceptable engineering error range.
作者
张继宏
贺轼
李国伟
陈华冠
ZHANG Jihong;HE Shi;LI Guowei;CHEN Huaguan(Zhejiang Zheneng Zhenhai Natuarl Gas Power Generation Co.,Ltd.,Ningbo,China,315208)
出处
《热能动力工程》
CAS
CSCD
北大核心
2024年第5期25-33,共9页
Journal of Engineering for Thermal Energy and Power
基金
河北省自然科学基金(E2022502017)。
关键词
燃气轮机
热力模型
冷却空气
设计工况
空气湿度
gas turbine
thermal model
cooling air
design working condition
air humidity
