300MW电站煤粉锅炉耦合掺烧生物质的CFD数值模拟  

Numerical simulation of biomass coupled by pulverized coal boiler in 300MW power station

作　　者：赵小军 王学斌[2] 孙锦余 薛东发 ZHAO Xiaojun;WANG Xuebin;SUN Jinyu;XUE Dongfa(Nandian Synthesis Energy Utilization Co.,Ltd.,Guangdong 510670,China;MOE Key Laboratory of Thermo-Fluid Science and Engineering,Xi′an Jiaotong University,Xi′an 710049,China)

机构地区：[1]南电能源综合利用有限公司,广东广州510670 [2]西安交通大学热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《洁净煤技术》2022年第3期56-64,共9页Clean Coal Technology

摘　　要：生物质作为零碳排放的可再生能源,被视为良好的燃煤替代燃料,与煤粉耦合燃烧是实现生物质利用的关键技术。为研究煤粉耦合掺烧生物质的影响,对300 MW电站煤粉锅炉耦合掺烧生物质进行了数值模拟,讨论了生物质掺烧比例和送粉温度对炉内参数的影响规律。结果表明,随着生物质掺烧比例增加,炉膛内氧气消耗量下降,CO及焦炭浓度降低,而NO_(x)排放因生物质中N元素高而有所增加。降低生物质送粉温度在一定程度上导致主燃区O_(2)体积分数升高,CO体积分数降低,对于炉膛内部各参数的影响总体不显著,因此在生物质混烧的工程中可以适当降低送粉温度而不对炉内燃烧的稳定性造成较大影响。Biomass,as a renewable source with zero carbon emission,is regarded as a promising alternative fuel to coal.Coupling combus⁃tion with pulverized coal is one of the key technologies to realize the utilization of biomass.In order to study the influence of pulverized coal coupling combustion of biomass,the coupling combustion of biomass in a pulverized coal boiler of 300 MW power station was numerically simulated,and the effects of biomass mixing ratio and powder feeding temperature on the parameters in the furnace were discussed.The results show that as the proportion of biomass increases,the oxygen consumption in the furnace decreases,and the concen⁃tration of CO and char decreases,while the NO_(x) emission increases at outlet.A lower temperature input of biomass only causes a slight in⁃crease of oxygen concentration and a decrease of CO concentration in the main combustion area,which has no significant change to the pa⁃rameters in the furnace.It means that a slight adjustment of biomass feeding temperature could not cause a significant influence for com⁃bustion in the furnace.

关 键 词：计算流体力学 生物质 耦合掺烧 燃烧特性 送粉湿度 

分 类 号：TK16[动力工程及工程热物理—热能工程]