某燃气轮机燃烧室燃料适应性数值研究

Numerical study on fuel flexibility of a gas turbine combustor

针对某燃气轮机燃烧室的燃料适应性进行了数值模拟,获得了以天然气和16.44、14.65、12.98 MJ/m^(3)(标准状态)3种不同热值煤制气为燃料时的燃烧室性能,并分析了不同燃料工况下的燃烧室流场和温度场特征。结果表明:等热负荷条件下,燃烧室出口温度的均匀性随燃料热值的降低而下降,但是在一定范围内仍然能够满足要求;而在燃料供气压力不变的条件下,燃烧室热负荷随燃料热值的下降而降低,但是出口温度分布的均匀性有所改善。因此,当燃烧室改烧煤制气时,应适当降低负荷运行或对喷嘴结构进行相应调整以保证燃烧室的长时间和稳定运行。

The fuel flexibility of a gas turbine combustor is numerically studied, and the combustor performance is obtained when firing the natural gas and coal-derived gases of different heat values(16.44, 14.65 and 12.98 MJ/m^(3),standard state). Moreover, the characteristics of flow field and temperature field in the combustor are analyzed. The results show that, under constant thermal power conditions, the uniformity of combustor outlet temperature reduces with the fuel heat value, but it can still meet the requirements within a certain range. While under the constant inlet fuel pressure condition, the thermal power of the combustor reduces with the fuel heat value, but the uniformity of outlet temperature is improved. Thus, when the combustor is modified to burn coal-derived gases, the thermal power should be reduced properly or the nozzle structure should be retrofitted correspondingly to maintain the durability and stability of the combustor.