Abstract: In order to meet the process requirements of low pressure drop, furnace tube in the radiation section of Continuous Catalytic Reforming (CCR) furnace adopts the "U" type or inverted "U" type furnace tube configuration which is different from the heating furnace of general oil refining units. Based on its special furnace tube configuration, the convection section of CCR furnace cannot recover the waste heat of high-temperature flue gas in the radiation section by means of flue gas heat extraction of preheating process. This paper discusses and analyzes the waste heat recovery schemes for flue gas from CCR furnace, which has been applied in petrochemical industry. By comparing the influence of economic and social effects under different flue gas middle temperature conditions, the concept of "mid-section temperature of economical flue gas" is proposed, and the method of selecting "economic flue gas middle temperature" is obtained through summary. The conclusion of this paper provides a necessary theoretical basis for optimizing the scheme of recovering high-temperature flue gas waste heat in the radiation section of the CCR furnace of the CCR unit and further improving the overall economy of CCR furnace.

Key words: continuous reforming reaction heating furnace, flue gas waste heat recovery, mid-section temperature of economical flue gas