燃烧器结构对气体火焰形状和炉内温度分布的影响  

IMPACT OF BURNER CONSTRUCTION ON SHAPE OF GAS FLAME AND TEMPERATURE DISTRIBUTION IN FURNACE

作　　者：王娟[1] 毛羽[1] 李丽红[1] 窦从从[1] 张建国[2] 刘义中[2] 

机构地区：[1]中国石油大学(北京)重质油加工国家重点实验室,北京市102249 [2]中国石化集团金陵石油化工有限责任公司,江苏省南京市210033

出　　处：《炼油技术与工程》2007年第8期29-33,共5页Petroleum Refinery Engineering

摘　　要：利用数值模拟方法,选用标准的k-ε湍流模型、PDF扩散燃烧模型、离散坐标辐射传热模型,研究了燃烧器结构对气体火焰形状和炉内温度分布的影响,主要考察了不同燃烧器喷孔直径、喷孔角度和旋流角度下速度、温度、火焰形状等参数的变化规律。结果表明,喷孔直径越小,喷孔出口速度越大,速度峰值也越大,射流的影响区域越大,燃料与空气的混合越好,燃烧速率越高,燃烧的火焰越短、越窄;喷孔角度和旋流配风也可以增强混合、强化燃烧,但其对火焰形状及长度和炉内整体的温度分布影响很小。因此,若要提高辐射传热效率,只能从配风和火道形状的优化入手,开发新结构的高效燃烧器。Numerical simulation of combustion in a gas furnace was performed with standard K-ε turbulent model, PDF diffusion combustion model and discrete ordinate radiation model. The velocity, temperature, and flame shape for different diameters, jet angles and swirling angle of jet hole were investigated. The simulating results showed that fuel velocity at the outlet of the jet hole and its peak value became larger with smaller jet hole diameter. The larger flow field affected by jet flow, the greater the mixing and combust rate of fuel and air. The flame became shorter and narrower, which was not favorable for heat transfer. Meanwhile, jet angle and swirling inlet of air had little effect on the combustion flame and flame length and overall temperature dis- tribution in the furnace. Therefore, the new type of burner with optimized air registration and configuration of combustion field was recommended in the design of the burner to improve the heat-transfer efficiency.

关 键 词：燃烧器 加热炉 火焰 燃烧 数值模拟 

分 类 号：TK17[动力工程及工程热物理—热能工程]