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采用FLUENT商用软件对自身预热式辐射管内的流动、传热和燃烧过程进行了二维数值模拟。研究了内套管与燃烧室出口的相对位置以及助燃空气的一次风与二次风的比例对火焰长度、辐射管温度的影响。结果表明,当增加套管和燃烧室出口的距离时,火焰长度有所增加,辐射管外壁温度、套管平均温度和烟气平均温度有所增加。当增大二次风比例时,火焰长度增加,辐射管外壁温度却减小。计算结果为自身预热式辐射管的开发与优化提供了参考数据。
A two-dimensional numerical simulation of the flow, heat transfer and combustion process in the preheated radiant tube was conducted by using FLUENT commercial software. The relative position between the inner sleeve and the outlet of the combustion chamber and the influence of the ratio of the primary air to the secondary air on combustion air on the length of the flame and the temperature of the radiant tube were studied. The results show that when the distance between the casing and the outlet of the combustion chamber is increased, the flame length increases, the temperature of the outer wall of the radiant tube, the average temperature of the casing and the average temperature of the flue gas increase. When the ratio of secondary air is increased, the flame length increases and the outer wall temperature of the radiant tube decreases. The calculation results provide reference data for the development and optimization of self-heating radiant tubes.