串行分级燃烧器柔和燃烧的实验研究

An Experimental Study on Mild Combustion in a Serial Staged Combustor

提出采用串行分级燃烧器来研究柔和燃烧,在该燃烧器中,第一段产生的烟气与燃料空气快速混合,在第二段中发生柔和燃烧。用实验方法将烟气量、当量比对柔和燃烧的影响进行了研究。测量了燃烧器出口温度、CO和NOx排放以及OH-PLIF分布图像。结果表明第一段烟气通过影响掺混段出口处温度、氧浓度以及速度来影响OH分布和污染排放特性。烟气量较大以及相对较低的出口温度可以实现较为分散的燃烧区域,而较高的烟气温度使反应区域更接近于出口且反应更加剧烈。研究结果为开发燃气轮机的柔和燃烧技术提供了基础数据。

A serial staged combustor is proposed in this paper to study the mild combustion. With the two -stage combustor, effects of the amount of flue gas, the equivalence ratio of both first stage and second stage equivalence ratio on mild combustion characteristics are investigated experimentally. In the experiments, measurement of the outlet temperature, CO and NOx emission and OH - PLIF ima- ges of mild combustion part are conducted. Results show that the OH distributions and pollution emission are influenced by amount of flue gas from first stage by changing the temperature, oxygen concentration and velocity at the mixing part outlet. Large amount of flue gas and relatively low temperature is positive in achieving homogenous combustion field. Moreover, the increase of the flue gas temper- ature results in the combustion occurring close to the mixing part and the increase of the combustion intensity. The results supply basic data for developing mild combustion technology for gas turbine combustor.