某1.2MW小型燃气轮机用DLE燃烧室的设计和试验

The Design and Modification of a 1.2MW Gas Turbine DLE Combustor

燃气轮机满足排放要求的关键是低污染燃烧室的研制。本文以项目组研发的适用于某MW级小型燃气轮机的低污染燃烧室为研究对象,针对研发过程中的原型燃烧室结构在整机实验中存在的问题进行分析,在整体结构尺寸、燃料及点火器布置方式、旋流器设计及掺混孔设计提出改进措施并进行了常压试验,采用单旋流器能够避免因为多旋流器之间流体流动相互影响造成的动力学不稳定现象;同时,点火器的插入位置会影响主燃区火焰分布,不当的结构误差会造成额外回流燃烧区,导致壁面局部高温区,增大NOx排放。最后利用数值模拟,从出口均匀性方面,验证了改进后结构的可行性。

The research of dry-low emission combustor is essential for the increasingly stringent emission standard. This paper focused on a tubular combustor, applied to a MW scale gas turbine, aiming at the problems occurred in the initial engine test. Some modifica-tion were held in overall dimensions, fuel and ignition system, swirler design and dilution holes then following with the atmospheric test. The results showed increasing the overall dimensions did reduce the CO emission by prolonging the resident time. The interference between multi-swilers and the geometry error of ignitor induced the fluid instability leading to the superfluous recirculation zone which resulted into local overheated area on liner and excessive NOs discharge. Modified design was proved by CFD simulation performed in distribution of temperature and velocity.