氢混天然气燃气轮机加湿低氮燃烧性能研究  

Research on DeNO_(x) Combustion Performance of Humidified Natural Gas with H_(2) Blending in Gas Turbine

作　　者：吴锋 杨承[1] 肖华 马晓茜[1] WU Feng;YANG Cheng;XIAO Hua;MA Xiao-qian(School of Electric Power,South China University of Technology,Guangzhou,China,Post Code:510640;School of Naval Architecture and Ocean Engineering,Guangzhou Maritime University,Guangzhou,China,Post Code:510725)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]广州航海学院船舶与海洋工程学院,广东广州510725

出　　处：《热能动力工程》2024年第1期137-148,共12页Journal of Engineering for Thermal Energy and Power

基　　金：广东省能源高效清洁利用重点实验室项目(2013A061401005);广州市基础研究计划基础与应用基础研究项目(SL2022A04J-00794)。

摘　　要：为了解贫预混燃烧室天然气掺氢加湿燃烧时的性能变化和容许加湿范围,解决氢混燃气轮机NO_(x)排放超标问题,以某燃气轮机燃烧室为研究对象,数值研究了掺氢比和加湿比对燃烧性能及污染物排放特性的影响。结果表明:燃料无加湿条件下,燃烧室出口CO和CO_(2)排放值随着掺氢比的增加而减小,较高燃烧温度将导致热力型NO_(x)排放值增加,掺氢比达到0.2以上时,NO_(x)排放已超出环保限值;燃料加湿条件下,随着加湿程度增加,燃气出口平均流速及水蒸气组分含量均增加,燃烧筒内全局温度、CO_(2)和NO_(x)排放值均降低,CO排放值先降低后增加;掺氢天然气加湿可实现低氮燃烧,考虑到低掺氢工况燃气轮机功率输出效能和高掺氢工况燃烧性能恶化问题,水蒸气加湿量不宜过多,当掺氢比为0.3时,推荐燃料加湿比为0.463。In order to understand the performance changes and allowable humidifying range of natural gas blended with hydrogen in a lean premixed combustor,and to solve the problem of NO_(x) emissions exceeding the standard in hydrogen blended gas turbine,taking a gas turbine combustor as research object,the influence of blending hydrogen ratio and humidification ratio on its combustion performance and pollutant emissions characteristics was numerically studied.The results show that under the condition of no humidification of the fuel,the CO and CO_(2) emissions from the combustor outlet drop with the increase of hydrogen blending ratio.However,thermal NO_(x) emissions will increase because of higher combustion temperature.When the hydrogen blending ratio reaches above 0.2,NO_(x) emissions exceed the environmental protection limiting value;under fuel humidification conditions,the average gas outlet velocity and H_(2O) mass fraction increase,and the global temperature decreases together with the emissions of CO_(2) and NO_(x) in the combustor,whereas the CO emissions decrease first and then increase with the increment of humidification ratio;humidified natural gas with H_(2) blending can achieve deNO_(x) combustion,but the amount of water vapor humidification ought to be moderate considering the following issues,such as the power output efficiency of gas turbine under low hydrogen blending ratio conditions and the deterioration of combustion performance under high hydrogen blending ratio conditions.The recommended fuel humidification ratio is 0.463 when the hydrogen blending ratio is 0.3.

关 键 词：燃气轮机 掺氢 数值模拟 加湿燃烧 污染物排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]