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炼油化工管式炉的炉型,总的说来是朝着采用双面辐射炉管,提高平均热强度的方向发展。但炉型的发展与炉衬结构有着密切的关系。过去有一种观点,认为单排管双面辐射只适用于高合金炉管,而不适于碳钢炉管。这是由于碳钢炉管的价格比合金钢炉管低,而当时的挂砖墙投资较高所形成的。近年来情况变了,出现了新型炉衬材料(如轻质耐热衬里、陶纤等),平面炉墙已经可以用“平墙”代替“挂砖”墙,而使炉衬费用仅占全炉的～12%,炉管系统投资却占全炉的50～70%。从而,碳钢炉管采用双面辐射“平墙”,提高辐射室热效率,不但结构简化,而且投资大大下降,在加热炉炉型的发展历程中,已日益显示出其优越性.
Refining and chemical tube furnace furnace, in general, toward the use of double-sided radiant tube, to increase the average intensity of the direction of development. However, the development of furnace and lining structure has a close relationship. In the past there was a view that single-tube double-sided radiation is only suitable for high-alloy tube, not suitable for carbon steel tube. This is due to the fact that the price of carbon steel tube is lower than that of alloy steel tube, and the investment of hanging brick wall was higher at that time. In recent years the situation has changed, there has been a new type of lining materials (such as lightweight heat-resistant lining, ceramic fiber, etc.), flat furnace wall has been able to use “flat wall” instead of “hanging brick” wall, ~ 12%, furnace tube system investment accounts for 50 ~ 70% of the furnace. Thus, the carbon steel tube with double-sided radiation “flat wall” to improve thermal efficiency radiation room, not only the structure is simplified, but also greatly reduced investment in the furnace furnace development process, has increasingly shown its superiority.