Turbolator-cast iron tube combined type air preheater and heating furnace waste heat recycling method

Abstract

The invention discloses a turbolator-cast iron tube combined type air preheater. The turbolator-cast iron tube combined type air preheater comprises a turbolator air preheater, a flue gas inlet formed at the top end of the turbolator air preheater, and an air outlet formed in the side wall of the turbolator air preheater, wherein a cast iron tube air preheater is connected at the bottom end of the turbolator air preheater; a flue gas outlet is connected at the bottom end of the cast iron tube air preheater; an air inlet is connected in the side wall of the cast iron tube air preheater; and an air channel is connected between the side wall of the cast iron tube air preheater and the side wall of the turbolator air preheater. The invention further discloses a heating furnace waste heat recycling method. The heating furnace waste heat recycling method comprises the following steps: introducing high-temperature flue gas into the air preheater, reducing the temperature of the high-temperature flue gas after the high-temperature flue gas exchanges heat with air, and enabling the high-temperature flue gas to leave the air preheater; and introducing normal-temperature air into the air preheater, rising the temperature of the normal-temperature air after the normal-temperature air exchanges heat with the flue gas, and enabling the normal-temperature air to leave the air preheater. The turbolator-cast iron tube combined type air preheater has the advantages of a simple structure, low manufacturing cost, wide fuel applicability and the like, and solves the problem that the air preheater is corroded at a dew point.

Description

technical field [0001] The invention relates to a heat exchange system, in particular to a spoiler-cast iron pipe combined air preheater suitable for recovery of waste heat from a heating furnace and a method for recovering waste heat from a heating furnace. Background technique [0002] At present, the waste heat recovery system of heating furnaces in chemical, petrochemical and coal chemical industries generally uses air preheaters to recover the waste heat in flue gas, so as to improve the thermal efficiency of heating furnaces and reduce operating costs. In theory, in order to improve the thermal efficiency of the heating furnace, the exhaust gas temperature of the heating furnace should be reduced as much as possible. In actual application, due to the influence of sulfur and water content in flue gas components, when the flue gas exhaust temperature drops to a certain level, different degrees of dew point corrosion will inevitably occur at the end of the low-temperature...

AI Technical Summary

Problems solved by technology

In actual application, due to the influence of sulfur and water content in flue gas components, when the flue gas exhaust temperature drops to a certain level, different degrees of dew point corrosion will inevitably occur at the end of the low-temperature section of the air preheater. Shortened air preheater service life

Air preheaters in the prior art either use one type of heat exchange element, such as spoiler air preheater, heat pipe air preheater, or use combined heat exchange elements, such as spoiler + heat pipe air Preheater, etc. All of the above air preheaters have the aforementioned dew point corrosion problem, which affects the service life of the air preheater

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