燃气轮机低热值合成气燃烧室内三维湍流流动的数值模拟研究  

Numerical Simulation Research on Three Dimensional Turbulence Flow in a Gas Turbine Combustor Burning Low Heat Value Syngas

作　　者：赵晓燕[1] 李祥晟[1] 丰镇平[1] 

机构地区：[1]西安交通大学叶轮机械研究所,西安710049

出　　处：《动力工程》2009年第4期330-334,共5页Power Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB210107)

摘　　要：对GE-F101型工业燃气轮机环形燃烧室燃用甲烷和低热值合成气的燃烧性能进行了数值研究,采用标准k-ε湍流模型和涡耗散湍流燃烧模型对燃烧室在不同燃料条件下的流场特性进行了数值模拟,并对燃烧室内的流场结构、温度分布、火焰结构及NOx分布进行了分析与比较;在此基础上对原燃烧室进行了一些改造.结果表明:随着燃料热值的降低,燃料射流速度增大,燃料和空气的混合程度减弱,燃烧稳定性降低,燃烧室内最高温度降低,NOx排放量减少;通过增大燃料喷嘴口径和增加旋流器的旋流数,可在一定程度上改善燃烧室内流动结构,增强燃料和空气的混合程度,因而提高了燃烧稳定性.Combustion performance of an annular combustor of GE-F101 gas turbine burning and low heat value synthetic gas was studied numerically. The standard k-ε turbulence model and the eddy-dispassion turbulence combustion model were applied to simulate numerically the flow characteristics in the combustor burning different fuels. Combustor flow field, temperature contours, flame structure and NOx distribution were analyzed and compared. Based on above research, the original combustor was retrofitted in some way. Results show that with the reduction of heat value of the fuel, the injection velocity of the fuel increases, the mixing extent of fuel with air reduces, which lead to the reduction of the combustion stability, the decreasing of the highest temperature inside the combustor and the diminishing of the NOx emission. By increasing the diameter of fuel nozzles and the swirl number, the flow structure in the combustor can be improved in some extent, thus the mixing extent of fuel with air enhances resulting in higher combustion stability.

关 键 词：燃气轮机 燃烧室 改造 低热值合成气 燃烧稳定性 数值模拟 

分 类 号：TK473.2[动力工程及工程热物理—动力机械及工程]