燃气分析法测试燃气轮机主燃烧室燃烧效率、气态污染物误差分析

Gas turbine primary combustor error analysis of combustion efficiency and exhaust emission using gas analysis method

介绍了测量燃气涡轮发动机主燃烧室燃烧效率、气态污染物排放的燃气分析系统,从取样、摆动测量方式、过程温度控制、仪器测量4方面分析了燃烧效率、气态污染物的误差.结果表明:采用混合式取样器以摆动测量方式得到的燃烧效率误差在0.21%以内,余气系数的误差在1.11%以内,气态污染物误差在2.24%以内.此外还对燃烧室不同工况下的燃烧效率和污染物组分体积分数分布进行了统计分析,确认了除较高油气比状态的燃烧效率分布较为均匀,可适当减少取样点数量外,足够的取样点数量是保证燃气分析测试结果准确性的必要条件.

The gas analysis system for measurement of combustion efficiency and exhaust emissions for aero gas turbine main combustor was introduced.The measurement error on combustion efficiency and exhaust emissions were analyzed in consideration of four aspects：sampling probe error,traversing mechanism movement,sampling probe temperature control and instrument error.Results e showed that by using mixed sampling probe and traversing mechanism,the measurement error for combustion efficiency was less than 0.21%,the error for air-fuel ratio and emissions was less than 1.11% and 2.24%,respectively.Combustion efficiency and emission volume fraction distribution under different combustor operational conditions were statistically analyzed.It is clear that under high power and high fuel air ratio conditions,these distributions are relatively uniform,thus it is appropriate to reduce a certain number of sampling points.Generally speaking,a large amount of sampling points is necessary to ensure the measurement accuracy of gas analysis method.