微油燃烧器用于冷态启炉及低负荷稳燃的数值模拟研究  

Numerical Simulation of Micro-oil Burner used for Cold Start-up and Low-load Stable Flame

作　　者：徐子笑 方毅波 杜志华 俞海玲 陈子越 张光学[3] XU Zi-xiao;FANG Yi-bo;DU Zhi-hua;无(Hohai University;Hangzhou Zheda Tianyuan Science and Technology Co.,Ltd.;China Jiliang University)

机构地区：[1]河海大学,江苏南京210024 [2]杭州浙大天元科技有限公司 [3]中国计量大学

出　　处：《电站系统工程》2022年第2期27-29,32,共4页Power System Engineering

摘　　要：为了探究微油燃烧器在深度调峰下的稳燃效果,建立了数值计算模型,对冷热态工况下的微油燃烧器的燃烧过程进行了数值模拟计算,气相采用可实现的k-ε湍流模型,同时采用离散相模型(DPM)模拟两种工况下煤粉颗粒运动轨迹,燃烧过程采用非预混燃烧模型,根据燃油及煤粉元素分析数据假设挥发分组成,得到了燃烧过程的流场速度、温度分布和煤粉颗粒的运动轨迹及燃尽梯度。结果表明,随着二次风刚性的增强,微油燃烧器中煤粉颗粒的扩散部位由燃烧器出口位置变化为一、二次风交界面处,在25%BMCR的热态工况下,颗粒燃尽梯度在燃烧器附近较小,可有效避免高温腐蚀,因此可通过适当降低二次风的刚性减少低负荷稳燃时的油耗量。In order to research the performance of the micro-oil burner in terms of depth peak, a numerical calculation model was established, and the combustion process of the micro-oil burner in the hot and cold conditions was simulated respectively. The gas phase adopts the reliable k-ε turbulence model, and discrete phase model has been used to simulate the trace of coal particles, the combustion process was simulated by the non-premixed combustion model, using the element analysis data of fuel and coal assume volatile content, and the flow field velocity, temperature distribution, trace and burn-out gradient of coal particles in the combustion process are obtained. The results show that with the increase of the rigidity of the secondary air, the diffusion region of the coal particles changes from the exit position of the burner to the interface of the primary and secondary air. In the low-load stable flame condition with a capacity of 25%BMCR. The particle burn-out gradient is small at the exit position of the burner, which can effectively avoid high-temperature corrosion.Therefor the fuel consumption can be reduced by reducing the rigidity of the secondary air.

关 键 词：微油燃烧器 深度调峰 低负荷稳燃 数值模拟 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]