微型燃气轮机变工况性能实验研究

开展了30 kW回热式微型燃气轮机(简称"微燃机")的变工况实验性能研究。重点讨论了环境温度35.6℃,大气压力下燃料耗量、效率、余热量、烟温、功热比等参数随负荷的曲线变化关系,并与设计标况相应的曲线关系做对比分析。研究表明:两种工况变负荷情况下,随着输出功减少,效率明显降低,排烟温度和余热量均减小。环境温度35.6℃,输出功为额定负荷的50%时,效率值仅降低2.23%,但当输出功为额定负荷的1/10时效率值降低了52.85%。排烟温度保持在129.90℃~250.05℃,余热量34.05~94.03kW之间。当环境温度高出设计温度20℃时,相同出功量天然气耗量明显增大,效率降低,两种工况效率差值随着出功增加而增大,效率差值在3.07%~8.12%之间;余热量增加30%左右,功热比降低30%~40%。微型燃气轮机最大净输功受环境温度影响较大,环境温度高出设计温度20℃时最大净输功仅为额定功率63.07%。

Experimental Study on Off-design Performance of Microturbine

The experiments on off-design performance of microturbine were carried out .The curve relations of performance parameters such as fuel consumption , efficiency , fuel gas heat , fuel gas temperature , power-heat ratio with the microturbine power input at the atmosphere temperature of 35.6 ℃were derived .The results were comparative analysis with nominal conditions at the atmosphere temperature of 15 ℃.It was found that at the atmosphere temperature of 35.6 ℃, with the decrease of microturbine power input, microturbine efficiency, flue gas temperature and flue gas heat reduce .When the engine power input was 15 kW（1/2 of nominal power input）, the efficiency decreases 2.23%;but when the power input was 3 kW（1/10 of nominal power input）, the efficiency decreases 52.85%.With the power input fluctuated with 3.0~30.0 kW, the fuel gas tempareture was with duration of 129.90℃~250.05 ℃and the fuel gas heat was with duration of 34.05~94.03 kW.Compared the results with the atmosphere temperature 15 ℃, with the same power input , the flue consumption increased remarkably , the efficiency decreased and the differ-ence was 3.07%~8.12% with the power input changes; the flue gas heat increased 30%, power -heat ratio decrease 30%~40%.At the atmosphere temperature of 35.6℃, the microturbine maximum of power input was only 63.7%of nominal power .