CN211291118U

CN211291118U - Novel riser waste heat recovery device with efficient heat exchange function

Info

Publication number: CN211291118U
Application number: CN201921841242.8U
Authority: CN
Inventors: 惠建明; 郁鸿凌
Original assignee: WUXI YIEN TECHNOLOGY CO LTD
Current assignee: WUXI YIEN TECHNOLOGY CO LTD
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-08-18
Anticipated expiration: 2029-10-30

Abstract

The utility model discloses a novel tedge waste heat recovery of high-efficient heat transfer device, including double-deck double-layered sleeve pipe, the outer tube is the insulating tube, is the heat exchange tube with raw coke oven gas direct contact's inner tube, and the space between outer tube and the inner tube is provided with the coil pipe that is used for the heat transfer, and the coil pipe coils the setting along inner tube outer wall, and the space lower part between outer tube and the inner tube is equipped with double-deck coil pipe structure. The utility model solves the safety problem of the riser waste heat recovery, and ensures that the device can not generate leakage in operation to affect the coke oven. The wall surface contacted with the raw gas is coated with the nano coating, so that coking is avoided, and frequent removal of coking is not needed. Meanwhile, the structure ensures reliable heat transfer, and each ton of coke can produce more than 100kg of medium and low pressure steam.

Description

Novel riser waste heat recovery device with efficient heat exchange function

Technical Field

The utility model relates to a novel riser waste heat recovery device with high-efficiency heat exchange, which is used for safely recovering the waste heat of crude gas in a riser of a coke oven.

Background

In the coke production process, the blended coal is heated and dry distilled in a coke oven by insulating air, and a large amount of raw coke oven gas can be generated while the coke is generated. From the balance distribution of the coking production process, sensible heat carried out by 950-1050 ℃ red coke pushed out from a coking chamber of the coke oven accounts for 37% of the coke oven heat, waste heat carried out by crude gas in an ascending pipe of the coke oven at 650-850 ℃ accounts for 36% of the coke oven heat, waste heat carried out by flue gas of the coke oven at 180-230 ℃ accounts for 16% of the coke oven heat, and the heat loss on the surface of a furnace body accounts for 11% of the coke oven heat. In the traditional process, ammonia water is sprayed to rapidly cool the mixture to 82-85 ℃, and then the mixture is cooled to 22-35 ℃ by a primary cooler. The process not only wastes a large amount of sensible heat of the raw gas, but also needs cooling circulating water and electric power, so that the recovery of the waste heat of the raw gas is an effective research direction for energy conservation and emission reduction in the coking industry.

The current domestic main technology for recovering the waste heat of the raw gas mainly comprises the following steps: water jacket technology, heat-conducting oil jacket technology, heat pipe type heat exchange technology, waste heat boiler technology, semiconductor thermoelectric power generation test and the like. The technologies still have the defects of water leakage, coking and graphitization, high cost and the like. The riser waste heat recovery often has very big safety problem, and the device can produce water and leak into the coke oven in service and influence the coke oven. The inner wall of the ascending pipe is directly contacted with raw coke oven gas, so the ascending pipe is easy to coke and needs to be frequently cleaned. In addition, the heat exchange medium water of the prior riser pipe waste heat recovery device is over-cooled to generate rapid thermal expansion and cold contraction, so that the safety of the structure is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a novel riser waste heat recovery device of high-efficient heat transfer, solved the biggest safety problem of riser waste heat recovery, guaranteed that the device can not produce in service and reveal the influence coke oven. The wall surface contacted with the raw gas can not coke, and the coke does not need to be frequently removed. Meanwhile, the structure ensures reliable heat transfer, and each ton of coke can produce more than 100kg of medium and low pressure steam.

In order to achieve the purpose, the technical scheme of the utility model a design a novel tedge waste heat recovery device of high-efficient heat transfer, including double-deck double-layered sleeve pipe, the outer tube is the insulating tube, is the heat exchange tube with raw coke oven gas direct contact's inner tube, and the space between outer tube and the inner tube is provided with the coil pipe that is used for the heat transfer, and the coil pipe coils the setting along inner tube outer wall, and the space lower part between outer tube and the inner tube is equipped with double-deck coil pipe structure. The jacket and the coil form are adopted, so that the direct heating of the pipe is avoided, hot water is introduced into the pipe, double safety guarantee is realized, and the water is prevented from leaking into the coke oven. The lower part adopts the double-layer coil pipe, cold water is firstly subjected to primary heating through the outer layer and then enters the main pipeline, and the main pipeline is ensured not to generate sharp expansion and contraction due to supercooling of the entering water, so that the structure safety is not influenced.

The further technical scheme is that the double-layer coil pipe structure comprises an inner coil pipe and an outer coil pipe, wherein the inner coil pipe is arranged at the lower part of a space between an outer pipe and an inner pipe, the outer coil pipe is wound outside the inner coil pipe, one end of the outer coil pipe is a heat exchange medium inlet, and the other end of the outer coil pipe is communicated with the inner coil pipe.

The further technical proposal is that a space between the surface of the coil pipe close to the outer wall of the inner pipe and the outer wall of the inner pipe is provided with a high temperature resistant filler; the high-temperature-resistant filler is high-temperature-resistant nano filler. And a filler which is high-temperature resistant and has a certain heat exchange coefficient is filled between the coil pipe and the inner layer to strengthen the heat exchange between the coil pipe and the pipe wall. The space between the inner coil pipe and the outer coil pipe can also be provided with high temperature resistant filler.

The further technical proposal is that the heat exchange medium in the coil pipe is water; the inner wall of the inner pipe is provided with a high-temperature corrosion-resistant nano coating; a gap for thermal expansion is arranged between the adjacent coil pipes, and the gap distance is 2 +/-1 mm. The inner wall of the riser pipe, which is in contact with the raw gas, is sprayed with the high-temperature-resistant and corrosion-resistant nano coating, so that the corrosion and high temperature are resistant, the nano structure is not easy to scale and adhere, and the long-term use of the pipe wall is ensured. An expansion gap of about 2mm is reserved between the coil pipes, so that the expansion can be freely realized, and the safety of the structure is ensured.

The further technical proposal is that the inner tube adopts a high temperature resistant ceramic tube, and the inner wall of the inner tube is provided with a nano coating. This embodiment is directed to the case where the apparatus is used in a coke oven having a height of 7m or more.

The utility model has the advantages and the beneficial effects that: the safety problem of the maximum waste heat recovery of the ascending pipe is solved, and the coke oven is ensured not to be influenced by leakage in the running process of the device. The wall surface contacted with the raw gas is coated with the nano coating, so that coking is avoided, and frequent removal of coking is not needed. Meanwhile, the structure ensures reliable heat transfer, and each ton of coke can produce more than 100kg of medium and low pressure steam. The jacket and the coil form are adopted, so that the direct heating of the pipe is avoided, hot water is introduced into the pipe, double safety guarantee is realized, and the water is prevented from leaking into the coke oven. The lower part adopts the double-layer coil pipe, cold water is firstly subjected to primary heating through the outer layer and then enters the main pipeline, and the main pipeline is ensured not to generate sharp expansion and contraction due to supercooling of the entering water, so that the structure safety is not influenced. And a filler which is high-temperature resistant and has a certain heat exchange coefficient is filled between the coil pipe and the inner layer to strengthen the heat exchange between the coil pipe and the pipe wall. The inner wall of the riser pipe, which is in contact with the raw gas, is sprayed with the high-temperature-resistant and corrosion-resistant nano coating, so that the corrosion and high temperature are resistant, the nano structure is not easy to scale and adhere, and the long-term use of the pipe wall is ensured. An expansion gap of about 2mm is reserved between the coil pipes, so that the expansion can be freely realized, and the safety of the structure is ensured.

Drawings

Fig. 1 is a schematic diagram of the novel efficient heat exchange riser waste heat recovery device.

In the figure: 1. an outer tube; 2. an inner tube; 3. a coil pipe; 4. an inner coil pipe; 5. and an outer coil pipe.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, the utility model relates to a novel tedge waste heat recovery of high-efficient heat transfer device, including double-deck double-layered sleeve pipe, outer tube 1 is the insulating tube, is the heat exchange tube with raw coke oven gas direct contact's inner tube 2, and the space between outer tube 1 and the inner tube 2 is provided with the coil pipe 3 that is used for the heat transfer, and coil pipe 3 coils the setting along inner tube 2 outer walls, and the space lower part between outer tube 1 and the inner tube 2 is equipped with double-deck coil pipe structure. The double-layer coil pipe structure comprises an inner coil pipe 4 and an outer coil pipe 5, wherein the inner coil pipe 4 is arranged at the lower part of a space between an outer pipe 1 and an inner pipe 2, the outer coil pipe 5 is wound outside the inner coil pipe 4, one end of the outer coil pipe 5 is a heat exchange medium inlet, and the other end of the outer coil pipe is communicated with the inner coil pipe 4. A space between the surface of the coil pipe 3 close to the outer wall of the inner pipe 2 and the outer wall of the inner pipe 2 is provided with high-temperature-resistant filler; the high-temperature-resistant filler is high-temperature-resistant nano filler. The heat exchange medium in the coil 3 is water; the inner wall of the inner pipe 2 is provided with a high-temperature corrosion-resistant nano coating; a gap for thermal expansion is arranged between the adjacent coil pipes 3, and the gap distance is 2 +/-1 mm.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a novel tedge waste heat recovery device of high-efficient heat transfer, its characterized in that, including double-deck double-layered sleeve pipe, the outer tube is the insulating tube, is the heat exchange tube with raw coke oven gas direct contact's inner tube, and the space between outer tube and the inner tube is provided with the coil pipe that is used for the heat transfer, and the coil pipe coils the setting along inner tube outer wall, and the space lower part between outer tube and the inner tube is equipped with double-deck coil pipe structure.

2. The novel efficient heat exchange ascending pipe waste heat recovery device according to claim 1, wherein the double-layer coil pipe structure comprises an inner coil pipe and an outer coil pipe, the inner coil pipe is arranged at the lower part of a space between the outer pipe and the inner pipe, the outer coil pipe is wound outside the inner coil pipe, one end of the outer coil pipe is a heat exchange medium inlet, and the other end of the outer coil pipe is communicated with the inner coil pipe.

3. The novel efficient heat exchange ascending pipe waste heat recovery device according to claim 2, wherein a space between the surface of the coil pipe close to the outer wall of the inner pipe and the outer wall of the inner pipe is provided with a high-temperature-resistant filler; the high-temperature-resistant filler is high-temperature-resistant nano filler.

4. The novel efficient heat exchange ascending tube waste heat recovery device according to claim 3, wherein the coil adopts a single-winding or double-winding structure, and the heat exchange medium in the coil is water; gaps for thermal expansion are arranged among the coil pipes, the gap distance is 2 +/-1 mm, and the inner wall of the double-layer jacket pipe is provided with a high-temperature corrosion-resistant nano coating.

5. The novel efficient heat exchange riser waste heat recovery device as claimed in claim 4, wherein the inner tube is made of high temperature resistant ceramic tube, and the inner wall of the inner tube is provided with a nano coating.