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及时发现燃气轮机组压气机叶片积垢故障并进行水洗作业,能够降低机组的运行维护成本,同时有助于避免其他气路故障的发生。以2台天然气长输管道LM2500+SAC型燃气轮机为例,建立了基于气路热力参数的燃气轮机压气机性能计算模型,分析压气机水洗作业前后压气机等熵效率、进气质量流量、耗功等的变化,结果表明:水洗作业后2台压气机等熵效率分别提升0.9%、1.5%,但每运行2 000 h将会带来约1%的压气机等熵效率衰减,当叶片表面积垢达到一定程度后效率衰减趋于稳定;压气机积垢每造成1%的等熵效率衰减,会造成约2%的折合质量流量衰减;水洗对降低机组功耗有明显的效果,但环境温度升高也会导致压气机耗功增加,因此耗功并不适合作为压气机积垢的判据。可见,可采用同压比下等熵效率衰减、同转速下压气机质量流量衰减作为判断压气机是否积垢的依据。
Timely detection of gas turbine compressor blade fouling failure and washing operations, can reduce the unit’s operation and maintenance costs, and help to avoid other gas path failure. Taking the LM2500 + SAC gas turbine with two natural gas long-distance pipelines as an example, the gas turbine compressor performance calculation model based on the thermal parameters of the gas circuit was established, and the isentropic efficiency of the compressor before and after the compressor washing operation was analyzed. The results show that the isentropic efficiencies of two compressors increase by 0.9% and 1.5% respectively after washing operation, but about 1% of compressor isentropic efficiency decay will be caused by each operation of 2 000 h. When the surface of the blade reaches the scale After a certain degree of efficiency attenuation tends to be stable; compressor fouling caused by 1% of the isentropic efficiency decay, will result in about 2% of the equivalent mass flow attenuation; washing to reduce the power unit has a significant effect, but the ambient temperature Will also lead to increased compressor work, so power is not suitable as a compressor fouling criterion. Can be seen under the same pressure ratio isentropic efficiency decay, with the compressor speed flow rate attenuation as a basis to determine whether the compressor fouling.