吸收系数对炉膛传热计算的影响

Effects of gas absorption coefficient on heat transfer calculation in furnace hearth

对炉膛内的辐射传热用蒙特卡罗方法进行模拟计算,对吸收系数为常数及吸收系数随温度、浓度变化情况下的炉膛烟气温度分布与炉管热强度分布进行对比。结果表明,烟气的吸收系数对计算结果有较大的影响,当烟气的吸收系数随温度、浓度变化时,计算所得的烟气温度分布、管壁热强度分布以及热负荷值与实际情况更加相符。

Using Monte-Carlo method to calculate the radiant heat transfer in the hearth of cylindrical furnace, the comparative calculation including gas temperature distribution of the hearth and calorific intensity of furnace tube was done, taking gas absorption coefficient as constant and as function of flue gas. The results show that the gas absorption coefficient has much effect on the calculation results. When the gas absorption coefficient varies with the temperature, concentration changing, the distribution of temperature and the tube surface calorific intensity and heat load value correspond to the facts.