制氢转化炉炉膛温度场研究

Research on furnace temperature field of hydrogen reformer

以顶烧式制氢转化炉为对象,研究了辐射炉膛内烟气温度的分布规律,利用CFD软件对辐射炉膛温度场进行了数值模拟,并与实际测量数据进行了对比分析,结果表明,燃烧器火焰长度区域烟气温度最高,与炉管壁温最高点一致。炉膛高度的中间段烟气由炉膛四周向中心积聚比较明显,四周烟气温度较低,炉膛中心区域中上部的转化炉管容易出现管壁峰值温度。炉膛烟气出口负压偏大时烟气分布均匀性稍好。在炉底烟道侧壁开孔面积相同,炉底各烟道截面积相等时烟气分布更均匀。

Taking the top fired steam reformer as the object, the distribution law of flue gas temperature in radiation furnace is studied. The CFD software is used to simulate the radiant box, and the conclusions are compared with the actual measurement data. The results show that the flue gas temperature in the flame length area of the burner is the highest, which is consistent with the highest point of the tube wall temperature. In the middle section of the radiant box height, the flue gas deviates obviously from the periphery of the box to the center, and the temperature of the flue gas in the periphery is low. The peak of the tube wall temperature is easy to occur in the middle and upper part of the radiant box center area. The flue gas distribution uniformity is slightly better when the negative pressure at the outlet of furnace flue gas is too high. When the negative pressure of flue gas outlet is larger, the uniformity of flue gas distribution is slightly better. When the opening area of the side wall of the tunnel is the same, the flue gas distribution is more uniform when the cross-sectional area of each tunnel is equal.