Waste heat recovery system of pipe heater

Abstract

The invention provides a waste heat recovery system of a pipe heater, which comprises a blower, a preposed preheater and an air preheating device, wherein the preposed preheater is arranged at the inlet or the outlet of a blower, the outlet of the preposed preheater is connected with the inlet of the air preheating device, cold air enters into the preposed preheater after entering into the blower, then is discharged after being heated by the preposed preheater, and finally enters into the air preheating device. Therefore, in the invention, by adding the preposed preheater, a heat source is introduced to heat for increasing the temperature of air and the temperature of air entering into the air preheating device is increased. With the temperature increment of a wall at the air inlet part of the air preheating device, heat is transferred to a flue gas outlet part through heat transmission. Therefore, the temperature at the flue gas outlet can be increased, flue gas dew point corrosion temperature can be avoided, and the effect of preventing flue gas dew point corrosion can be achieved.

Description

technical field [0001] The invention relates to the field of waste heat recovery of heating furnace flue gas in petrochemical industry, in particular to a waste heat recovery system of tubular heating furnace equipped with pre-heater and air preheater, which can solve the problem of low temperature in winter. As a result, not only the wall temperature of the air inlet of the air preheater is low, but also the wall temperature of the flue gas outlet is low, resulting in too low temperature at the flue gas outlet, prone to dew point corrosion, and causing unnecessary corrosion effects on equipment, etc. . Background technique [0002] As the nature of raw oil in the refining industry becomes heavier and the sulfur content of raw materials continues to increase, as a key equipment for the recovery of waste heat from heating furnace flue gas in domestic petrochemical enterprises - the operating effect of the air preheater is more and more valued by enterprises . During the pro...

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Problems solved by technology

[0005] The existing heating furnace waste heat recovery system has serious problems of ash accumulation and dew point corrosion in the flue gas, and the exhaust gas temperature is high, which cannot achieve environmental protection; it is not conducive to the temperature of the combustion air

[0006] It can be seen that the above-mentioned existing tubular heating furnace waste heat recovery system obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and the general product has no suitable structure to solve the above-mentioned problems. This is obviously the relevant industry. Urgent problem

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