Abstract
The physical field of different heating furnaces and its related aspects were studied by numerical simulation method. Firstly, by studying the heating furnaces of different shapes, namely triangle furnace, square furnace and cylindrical furnace, it was found that: square furnace and cylinder furnace combustion was more full, high temperature range was larger, different furnace tube heat intensity distribution was more uniform, the amount of heat loss was lower, the outlet NOx emission was higher. By studying the cylindrical furnaces with different dip angles of 95°, 93°, 90°, 87° and 85°, it was found that with the decrease of the dip angle, the inner reflux decreases, the reaction rate decreases, the range of higher temperature increases, the heat absorption of the furnace tube was larger, and the NOx concentration at the outlet was lower.
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