U型蓄热式辐射管表面温度分布数值模拟研究

Numerical Simulation on Surface Temperature Distribution of a U-Type Regenerative Radiant-Tube

以一支燃烧能力为 5 8kW的蓄热式辐射管为对象 ,利用商业CFD软件CFX4 3对蓄热式辐射管表面温度分布进行数值模拟 ,并进行试验验证 ,重点分析了辐射管沿长度方向温度分布的规律及其影响因素。结果表明 ,高速煤气射流产生的湍动燃烧动力 ,能搅拌炉膛、消除炉内的温差 ,有利于提高烟气的加热能力 ,改善其加热性能。但煤气喷射速度不能无限制增大 ,对于该类型的蓄热式辐射管燃烧器 ,煤气喷射速度可限制在 80m/s～ 1 1 0m/s。

Applied high temperature air combustion technology on radiant-tube, a new type regenerative radiant-tube combustor was designed. With the aim to study the surface temperature distribution of this kind of radiant-tube, using commercial CFD code CFX4.3, a set of radiant-tube facility with 58 kW regenerative combustor was studied numerically and validated experimentally. The results show that gas jet with high speed can result in turbulent combustion dynamic, stir the furnace chamber and eliminate its temperature difference, which can increase the heating properties of flue. But the inlet velocity of gas can't be increased unrestrictedly. For this kind of combustor, the velocity of gas jet should be limited within 80 m/s - 110 m/s.