The effects of combustion modes,namely space combustion and wall-fired combustion, on the heat flux distribution in a double-side radiation box furnace were investigated by means of the Monte Carlo method. It was showed that,in the space combustion,the simulation results for the furnace temperature and the average heat flux of the furnace tube were consistent with industrial data basically. The simulation for the radiant heat transfer process had good applicability to the double-side radiation box furnace. The heat flux distribution of the wall-fired combustion was improved compared to that of the space combustion,the peak heat flux reduced from 58.0 kW/m2 to 52.5 kW/m2,and the uneven coefficient of the heat flux reduced from 4.6 to 3.7,which was beneficial to the reduction of the local heating of the tubes. The average heat flux of the wall-fired combustion was slightly higher than that of the space combustion,which was because the radiation ability of the wall was stronger than that of flue gas.%采用蒙特卡罗方法,分别考察了空间燃烧和附墙燃烧方式对双面辐射方箱炉热强度分布的影响.实验结果表明,对空间燃烧方式的炉膛温度和炉管平均热强度模拟结果与工业数据基本一致,蒙特卡罗方法能够模拟炉膛内的辐射传热过程,对双面辐射方箱炉具有良好的适用性.附墙燃烧方式较空间燃烧热强度分布有明显改善,热强度峰值由58.0 kW/m2降至52.5 kW/m2,热强度不均匀系数由4.6降至3.7,有利于减少炉管局部过热;相同条件下附墙燃烧的平均热强度略高于空间燃烧方式,原因是炉墙辐射能力比高温烟气辐射能力更强,有利于辐射传热.
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