双辐射室裂解炉不同横跨段结构实验及数值模拟

双辐射室裂解炉采用两个辐射室共用一个对流段的结构，在一侧辐射室正常生产而另一侧进行烧焦操作时，对流室烟气的偏流和回流会引起对流炉管的受热不均，局部对流炉管传热能力下降。通过冷模实验和数值模拟分析了双辐射室裂解炉原水平横跨段结构、倾斜横跨段结构和桥墙结构对对流室底部烟气流动的影响。结果表明，倾斜横跨段结构和对流室底部增设桥墙结构对对流室烟气的偏流和回流具有明显的改善作用，烟气在对流室的偏流率由原来的50.08%分别降为24.39%和2.44%，烧焦一侧对流室的温度也有较大程度地降低。

Experiment and numerical simulation of different crossover section in double-firebox cracking furnace

There is only one convection section in doublefirebox cracking furnace.The deflection and circumfluence of flue gas in convection section would affect the heat transfer when one firebox is on decoking operation,and some tube's temperature would be higher.For this problem,cold experiment and numerical simulation were used to study the influences of customary horizontal crossover section,gradient crossover section and oriented wall.The results show that oriented wall could reduce the flue gas deflection and the circumfluence in convection section bottom clearly,and the ratio of gas deflection reduces to 24.39% and 2.44%,respectively.The temperature of flue gas in convection section whose tubes went to the decoking firebox also reduces.