相似原理在燃气轮机离心压缩机组能耗计算中的应用

Application of Similarity Principle in Calculating Energy Consumption of Gas Turbine Driven Centrifugal Compressors

燃气轮机是输气管道压气站中离心压缩机的主要驱动装置。燃气轮机的变工况特性使其热耗率随工况条件的变化而变化,因此,在工艺计算中难以准确计算燃气轮机的能耗值。介绍了燃气轮机热耗率的主要影响因素,引入相似参数的概念,将影响燃气轮机工况的大气压力、环境温度、动力透平转速和负载率4个主要参数代入相似参数中,利用燃气轮机相似工况原理,分析了变工况条件下燃气轮机热耗率的变化规律,并用最小二乘法拟合热耗率变化关系曲线,能够较准确地计算出输气管道上燃气轮机离心压缩机组的能耗,这对于输气管道的优化运行具有一定的指导意义。

The gas turbine is the principal driver applied in the Compressor Station of the gas pipeline. Owing to the behavior of the variable performance, the heat rate of the gas turbine varies with the operation conditions. Therefore, it becomes a critical problem to calculate the energy-consumption in gas pipelines accurately. The article introduced the factors which affect the heat rate of the gas turbine and led to the similarity parameter. Four principle parameters(atmospheric pressure, ambient temperature, power turbine speed and load rate) which affect gas turbine operation are substituted into the similarity parameters. Moreover, This article utilizes the theory of gas turbine similarity operation(Given two similarity parameters are consistent,the gas turbine operation exhibits similar properties, and then the heat rate remains constant.) to analyze the variation law of heat rate with the change of working conditions and used the least square method(LSM) to match the heat rate curve. So it turned out to be accurate to calculate the heat rate of the gas turbine driven centrifugal compressors in the gas pipeline.