低热值燃料对微型燃气轮机运行特性的影响

Influence of Low-heating-value Fuels on the Operating Characteristics of a Miniature Gas Turbine

生物质气具有热值低、可燃成分不同的特点,这种特点导致生物质气在微型燃气轮机上的应用存在问题。为天然气设计的微型燃气轮机应用低热值燃料时,会导致工质流量和热力学特性的变化,从而导致燃气轮机运行特性的变化。为将这种低热值燃料应用于微型燃气轮机,提出了几种对微型燃气轮机进行调整和改进的方法,使微型燃气轮机能适应这种低热值的燃料。应用数学模型,计算出了在应用这些方法后对微型燃气轮机运行特性的影响。结果表明,应用低热值燃料后微型燃气轮机的运行特性会发生明显的改变,在调节和改进方法中对压气机和透平进行改进以适应新的流量匹配是最适合的方法。除匹配外,还提出了一些应用低热值燃料有待解决的问题。

Biomass gas features a low heat value and different combustible constituents,leading to various problems during its application in miniature gas turbines.When a miniature gas turbine designed for burning natural gas uses a low-heat-value fuel,a change of working medium flow rate and thermodynamic characteristics may result,bringing about a change of the operating characteristics of the gas turbine.To use the low-heat-value fuel for the gas turbine,proposed were several methods for adjusting and improving the miniature gas turbine to adapt it to such a fuel.By using a mathematical model,calculated was the influence of using these methods on the operating characteristics of the gas turbine.It has been found that after the use of the low-heat-value fuel,a conspicuous change may occur to the operating characteristics of the gas turbine.Among the methods under discussion,the improvement of the compressor and turbine to accommodate to a new matching of the flow rates is the most suitable one.Apart from the matching problem,the authors have also mentioned other problems yet to be solved for using low-heat-value fuels.