同心圆二次风反切锅炉炉内气固多相流动特性的研究

为了防止大型电站锅炉炉内结渣,减轻高温对流受热面处烟气温度偏差,本文提出了二次风燃烧器喷口反切布置的同心圆燃烧方式。通过对炉内气相流动的冷模试验研究和数值模拟,单颗粒炉内运动的数值模拟和颗粒群在炉内运动的冷态试验研究结果表明:合理的二次风反切可在炉内形成“风包粉”燃烧方式,且使水平烟道内高温对流受热面处的气流速度和颗粒得到均匀分布,这对防止炉内结渣、减轻高温对流受热面热偏差起促进作用。

Research into Characteristics of Gas-solid Multiphase Flow in Furnace with Anti-tangential Secondary Air

In order to prevent slagging in furnaces of high - capacity utility boilers, and to decrease flue gas temperature deviation on convective heating surfaces, this paper presents the concentric firing system (CFS) with anti-tangential secondary air. Through a series of investigations of aerodynamics and particle movement characteristics by cold model test and numerical simulation, the paper obtains that anti-tangential secondary air can concentrate coal particles at furnace center, prevent slagging in furnace, and get a well-distributed gas velocity and particles in convective flue gas passage.