生物质颗粒燃料层燃燃烧的FLIC数值模拟与分析  

Numerical simulation and analysis of biomass briquettes grate furnace combustion based on FLIC

作　　者：马括 邬思柯 王小聪[2] 熊义 陈洪君[2] 楼波[2] 

机构地区：[1]广州特种承压设备检测研究院,广东广州510663 [2]华南理工大学电力学院,广东广州510640

出　　处：《可再生能源》2015年第5期766-770,共5页Renewable Energy Resources

基　　金：广州市质量技术监督局项目(HT13050327)

摘　　要：通过FLIC数值模拟软件对中国南方地区某台生物质层燃锅炉进行了数值模拟研究,获得固相温度分布、空间烟气温度分布以及主要烟气成分沿床长的变化规律。模拟结果表明,生物质层燃炉燃烧主要分3个阶段,依次为水分蒸发段（0-0.5 m）、挥发分逸出燃烧段（0.3-1.7 m）和固定碳燃烧段（0.6-2.2 m）。生物质中挥发分比例高,逸出后床层高度明显降低。沿炉膛长度方向0.5-1.7 m处为高温烟气区域,温度达1100-1670 K。针对不同燃烧段的特点,提出了相应的供风策略,如在挥发分逸出燃烧段供风80%-90%,在固定碳燃烧段供风10%-20%,降低烟气热损失,保证生物质燃烧效率,并建议根据烟气温度设计炉拱角度,加强炉拱对水分蒸发段辐射,加快燃料利用过程。模拟结果对生物质层燃炉的运行与设计提供了参考。The combustion simulation of a typical biomass grate furnace in Southern China was carried out by applying the fluid dynamics-based incinerator code（FLIC）. The solid phase temperature distribution along the bed length, the spatial temperature profile and the compositions of the flue gas were obtained. The results showed that there were mainly three stages of furnace combustion of biomass, including the dehydration and drying（0-0.5 m）,fast pyrolysis and combustion of volatiles（0.3-1.7 m）,and finally the combustion of fixed carbon（0.6-2.2 m）. The height of bed decreased significantly owing to the high proportion of volatile matter in biomass. High temperature area was between 0.5 m and 1.7 m along the bed length, where the temperature were between 1 100 K and 1 670 K. According to the characteristics of different combustion stages,the corresponding air supply strategy was suggested,for instance,the air supply at pyrolysis stage should be kept at 80%-90% while the corresponding figure for fixed carbon combustion was 10%-20% for the sake of reducing flue gas heat loss and enhancing the combustion efficiency. The simulation results were beneficial to optimize the combustion process of biomass grate furnace to some extent in the future.

关 键 词：生物质 层燃炉 燃烧模拟 优化 

分 类 号：TK6[动力工程及工程热物理—生物能] TK16