燃气轮机化学回热循环仿真研究

Simulation research of chemically recuperated gas turbine

为系统研究燃气轮机化学回热循环的性能,在循环过程热力学分析的基础上,建立了燃气轮机化学回热循环数学模型,并针对某型三轴燃气轮机利用MATLAB/Simulink软件进行了仿真计算,得出了燃气轮机化学回热循环变工况性能.结果表明:燃料发生蒸汽转化反应提高了其热值,装置循环效率相对提高量可达32%以上;在装置输出功率不变的情况下,涡轮进口温度下降明显,可以大幅度提高燃机寿命,且排气温度大幅度降低;在保证燃机结构几何尺寸不变的条件下,该循环的共同工作线将向着远离压气机喘振边界移动,对于提高压气机喘振裕度是有利的.

To study the performance of chemically recuperated gas turbine（CRGT） system,based on the thermodynamic analysis,the mathematical model of a three-axis CRGT system was established with the use of MATLAB/Simulink software.Simulation results show that the steam reforming reaction in the fuel occurs and increases the calorific value,which can increase the relative efficiency of devices by more than 32%.Under the constant output power,the inlet temperature of the turbine drops obviously,which can prolong the service life of the gas turbine system and cut down the exhaust temperature substantially.With the same geometrical structure of the turbine,the engine operating line can work far away from the stall margin,which is beneficial to the improvement of compressor surge margin.