Spiral coil conduction type raw coke oven gas waste heat recovery equipment

Abstract

The invention discloses spiral coil conduction type raw coke oven gas waste heat recovery equipment. The spiral pipe conduction type raw coke oven gas waste heat recovery equipment comprises an ascending pipe inner barrel, an ascending pipe outer barrel and a heat transfer coil, wherein connecting flanges are arranged at the upper end and the lower end of the ascending pipe inner barrel and the ascending pipe outer barrel, the heat transfer coil is spirally wound on the outer side of the ascending pipe inner barrel, a heat transfer base plate is arranged between the heat transfer coil and theascending pipe inner barrel, the inner wall of the heat transfer base plate is tightly fitted with the outer wall of the ascending pipe inner barrel, the shape of the outer wall of the heat transfer base plate is matched with that of the heat transfer coil spirally wound on the heat transfer base plate, an insulating layer fills between the heat transfer coil and the ascending pipe outer barrel, and a vent nozzle is arranged at the bottom of the ascending pipe outer barrel. Compared with the prior art, the spiral coil conduction type raw coke oven gas waste heat recovery equipment has the beneficial effects that the heat transfer condition between the heat transfer coil and the ascending pipe inner barrel is improved, and the recovery rate of the heat of the raw coke oven gas is increased;the phenomenon that the tar in the raw coke oven gas is condensed on the cold wall is avoided; and the manufacturing cost of the waste heat recovery equipment is reduced.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery and utilization of coke oven high-temperature raw gas, in particular to a spiral coil conduction waste heat recovery device for raw gas. Background technique [0002] The temperature of the high-temperature raw gas from the coke oven is about 750°C, and the heat produced is equivalent to one-third of the total heat consumed by coking in the coke oven. From the gas refining system, how to recover the heat of high-temperature raw gas has been discussed a lot. However, due to the inherent characteristics of raw gas, the methods and structures in the existing technical solutions have major operational defects and hidden safety hazards in industrial production. For example, the current In the water jacket vaporization method disclosed in the technology, the mixture of water and water vapor passes through the jacket, and the high-temperature raw gas passes through the inner cylinder of the j...

AI Technical Summary

Problems solved by technology

[0002] The temperature of the high-temperature raw gas from the coke oven is about 750°C, and the heat produced is equivalent to one-third of the total heat consumed by coking in the coke oven. From the gas refining system, how to recover the heat of high-temperature raw gas has been discussed a lot. However, due to the inherent characteristics of raw gas, the methods and structures in the existing technical solutions have major operational defects and hidden safety hazards in industrial production. For example, the current In the water jacket vaporization method disclosed in the technology, the mixture of water and water vapor passes through the jacket, and the high-temperature raw gas passes through the inner cylinder of the jacket. The mixture of water and steam, the inner wall of the jacket is a cold wall, the tar in the raw gas condenses on the inner wall of the jacket, and gradually asphalt-graphitization causes the riser to block; (2) The water in the jacket is overheated or dry-fired. The accident caused by the accident, the leakage caused by the accident will bring harm to the coke oven; (3) The riser heat exchanger usually belongs to a pressure vessel or a boiler. There are dozens to hundreds of carbonization chambers on a coke oven, that is, there are several Ten or hundreds of riser heat exchangers, pressure vessels or boilers bring great pressure to production management, and pressure vessels or boilers require regular supervisory inspections while coke ovens must be in continuous production

Although the device adopts the heat exchange structure of the spiral coil, the spiral coil and the ascending inner tube are in line contact, and the heat conduction effect is not ideal.

[0004] The patent document with the application number 201020667321.4 discloses the "multi-spiral coil type coke oven riser waste heat utilization device", and the patent document with the application number 201410795216.1 discloses the "coke oven waste gas riser sensible heat recovery device and recovery method", the above The patented technology adopts the structure of coiled coil between the rising inner cylinder and the rising outer cylinder, and fills the powder heat conduction medium between the rising inner cylinder and the rising outer cylinder. The technical defect of this patented technology is: in practical application Among them, the powdery heat transfer medium cannot be filled between the spiral coil and the ascending inner tube, and there are pores, which will still affect the heat conduction efficiency between the ascending inner tube and the spiral coil

[0005] The patent document with the application number 201621243607.3 discloses "a coke oven raw gas rising tube heat exchanger", which uses a rising inner tube whose inner wall matches the spiral coil structure, which can make the rising inner tube and the coil larger The area fits together to achieve the purpose of efficient heat conduction, but this structure has higher requirements on the performance of the rising inner tube: because the inside of the rising inner tube is exposed to high-temperature raw gas, it is required to have high corrosion resistance, high temperature resistance and good performance. The strength and rigidity of the spiral coil tube must be high-efficiency heat conduction, high temperature resistance, close fit (softness), high heat conduction but no corrosion resistance, and the material requirements for the rising inner cylinder are very high and difficult to manufacture. high cost

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