Combustion characteristics of a lean premixed LPG–air combustor
Combustion characteristics of a lean premixed LPG–air combustor
复制标题
稀薄预混LPG-空气燃烧器的燃烧特性
DOI：
10.1016/j.ijhydene.2008.10.036
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发表时间：
2009
影响因子：
7.2
通讯作者：
A. Gupta
中科院分区：
文献类型：
--
作者：
H. Kim;V. K. Arghode;A. Gupta
在常压和加压3.5bar、空气预热温度为450K的模拟稀薄预混燃气轮机燃烧室条件下，考察了预混器内燃料/空气混合效应对NOx和CO排放等燃烧特性的影响。将所得结果与扩散火焰型燃气轮机燃烧室的排放特性进行了比较。结果表明，燃烧室内燃料与空气的混合对NOx排放有很大影响。通过向燃烧室提供均匀的燃料/空气混合气可以降低NOx排放，并且随着热气体在燃烧室停留时间的减少，NOx排放也会减少。在所考察的实验条件下，稀薄预混燃烧室的NOx排放水平是当量比的强函数，而传统扩散火焰燃烧室的NOx排放水平对当量比的依赖性较小。此外，回流受燃烧室顶角的影响，减少了燃烧室内的高温反应区或热点，从而降低了NOx的排放水平。
Fuel/air mixing effects in a premixer have been examined to investigate the combustion characteristics, such as the emission of NOxand CO, under simulated lean premixed gas turbine combustor conditions at normal and elevated pressures of up to 3.5bar with air preheat temperature of 450K. The results obtained have been compared with a diffusion flame type gas turbine combustor for emission characteristics. The results show that the NOxemission is profoundly affected by the mixing between fuel and air in the combustor. NOxemission is lowered by supplying uniform fuel/air gas mixture to the combustor and the NOxemission reduces with decrease in residence time of the hot gases in the combustor. The NOxemission level of the lean premixed combustor is a strong function of equivalence ratio and the dependency is smaller for a traditional diffusion flame combustor under the examined experimental conditions. Furthermore, the recirculation flow, affected by dome angle of combustor, reduces the high temperature reaction zone or hot spot in the combustor, thus reducing the NOxemission levels.