预混燃烧下环境温度对某型燃气轮机燃烧稳定性和NO_x排放影响的数值研究

Numerical Study on the Influence of Environmental Temperature on Combustion Stability and NO_x Emission under Premixed Combustion of a Heavy-duty Gas Turbine

环境温度通过改变燃烧室入口空气温度进而影响燃气轮机燃烧稳定性和NOx排放。为了掌握预混燃烧模式下环境温度对燃气轮机燃烧稳定性和NOx排放的影响规律,本文以某重型燃气轮机燃烧室为研究对象,采用SAS湍流模型和涡耗散概念燃烧模型,通过改变环境温度,对多旋流喷嘴燃烧室预混燃烧模式下燃烧稳定性和NOx排放进行了数值计算。研究结果表明:在燃气轮机预混燃烧模式下,提升燃气轮机环境温度,有利于提高燃烧室燃烧稳定性;环境温度从0℃上升到30℃,在不调整燃料和空气流量的情况下,燃烧室出口NOx排放质量分数增加97.8%。

Environmental temperature affects gas turbine combustion stability and NOx emissions by changing the inlet air temperature of the combustor. In order to grasp the influence of environmental temperature on combustion stability and NOx emissions of gas turbines, the SAS turbulence model and the vortex dissipation conceptual combustion model are used to establish a heavy-duty gas turbine combustor model. The combustion stability and NOx emissions in the multi-swirl nozzle combustor premixed combustion mode at different environmental temperature are numerically simulated. The research results show that in the gas turbine premixed combustion mode, the gas turbine environmental temperature is raised, which is beneficial to improve the combustion stability of the chamber;the environmental temperature rises from 0℃to 30 ℃, the NOx emission mass fraction at the combustor outlet increases by 97.8% in the case of unregulated fuel and air flow.