CN214571693U

CN214571693U - Ascending pipe heat exchanger for preventing ammonia water from flowing backwards

Info

Publication number: CN214571693U
Application number: CN202120602136.5U
Authority: CN
Inventors: 徐守国; 陆建宁; 杨桂兰
Original assignee: Nanjing Huadian Energy Saving And Environmental Protection Co ltd
Current assignee: Nanjing Huadian Energy Saving And Environmental Protection Co ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-11-02
Anticipated expiration: 2031-03-24

Abstract

The utility model discloses a rising pipe heat exchanger for preventing ammonia water from flowing backwards, which comprises a crude gas pipeline, an upper flange, a lower flange, a spiral heat exchange coil, a lower inlet, an upper outlet and a guide cylinder of a heat exchange medium; the raw coke oven gas pipeline sequentially comprises an outer cylinder, a heat insulation layer, a heat conduction layer and an inner cylinder from outside to inside; the bottom of the upper flange is welded with the top of the outer cylinder body, and an expansion space is reserved between the bottom of the upper flange and the top of the inner cylinder wall; the lower flange is respectively welded and connected with the bottom of the outer cylinder body and the bottom of the inner cylinder body; the spiral heat exchange coil is arranged in the heat conducting layer, and an opening at one end is connected with the lower inlet and the lower outlet, and an opening at the other end is connected with the upper inlet and the lower outlet; the bottom welding of going up the flange has the guide cylinder of perpendicular downwardly extending, and the guide cylinder is located inside the raw coke oven gas pipeline to be equipped with the sealing washer in the clearance between guide cylinder and interior barrel. The utility model discloses the device can prevent that raw coke oven gas or aqueous ammonia from entering into in the clearance of inside and outside jar to heat exchange coil and heat-conducting layer are soaked by the aqueous ammonia and are produced the phenomenon emergence of corroding.

Description

Ascending pipe heat exchanger for preventing ammonia water from flowing backwards

Technical Field

The utility model belongs to the technical field of the heat exchanger, in particular to prevent rising pipe heat exchanger of aqueous ammonia backward flow.

Background

The coke oven can perform high-temperature dry distillation treatment on coal, and efficiently convert the coal into products such as coke, coke oven gas, coal tar, crude benzene and the like, thereby being an efficient energy conversion kiln. In the coke oven waste heat, the heat brought out by the crude gas at 650-700 ℃ accounts for about 36%, and the method has extremely high recycling value. At present, the industrial application of raw coke oven gas is usually realized by adopting a cooling treatment process, and the traditional process comprises the following steps: a large amount of 70-75 ℃ circulating ammonia water is sprayed to high-temperature raw gas to cool the raw gas, so that waste heat recovery is realized, however, when the ammonia spraying device breaks down, the ammonia water dropping downwards in the inner cylinder can enter the gap between the inner cylinder and the outer cylinder of the raw gas pipeline, so that the phenomenon that the spiral heat exchange coil and the heat conducting layer are corroded due to soaking of the ammonia water is caused.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: to the not enough of above-mentioned prior art, the utility model provides a prevent ascending pipe heat exchanger of aqueous ammonia backward flow, it can effectively prevent and treat the aqueous ammonia backward flow, avoids equipment corrosion.

The technical scheme is as follows: in order to achieve the above purpose, the utility model adopts the following technical scheme:

a rising pipe heat exchanger for preventing ammonia water from flowing backwards comprises a raw coke oven gas pipeline, an upper flange, a lower flange, a spiral heat exchange coil, a lower inlet, a lower outlet, an upper inlet and an upper outlet of a heat exchange medium and a guide cylinder; the raw coke oven gas pipeline sequentially comprises an outer cylinder, a heat insulation layer, a heat conduction layer and an inner cylinder from outside to inside; the bottom of the upper flange is welded with the top of the outer cylinder body, and an expansion space is reserved between the bottom of the upper flange and the top of the inner cylinder wall; the lower flange is respectively welded and connected with the bottom of the outer cylinder body and the bottom of the inner cylinder body; the spiral heat exchange coil is arranged in the heat conduction layer, and an opening at one end is connected with the lower inlet and the lower outlet, and an opening at the other end is connected with the upper inlet and the lower outlet; the bottom welding of going up the flange has the guide cylinder of perpendicular downwardly extending, and the guide cylinder is located inside the raw coke oven gas pipeline to be equipped with the sealing washer in the clearance between guide cylinder and interior barrel.

As a preferable or improved scheme:

the lower inlet and the lower outlet are arranged on the side wall of the lower part of the raw coke oven gas pipeline and penetrate through the outer cylinder body and the heat insulation layer, and the upper inlet and the lower outlet are arranged on the side wall of the upper part of the raw coke oven gas pipeline and penetrate through the outer cylinder body and the heat insulation layer.

The number of the guide cylinders and the number of the sealing rings are two.

And a leakage detecting pipe is also arranged on the side wall of the outer cylinder of the crude gas pipeline.

The raw coke oven gas pipeline also comprises a group of straight fins, the group of straight fins are fixed on the inner side wall of the inner cylinder body, and an expansion space is reserved between the top of the group of straight fins and the bottom of the guide cylinder.

The ammonia spraying device is arranged on the upper part of the crude gas pipeline and comprises an ammonia spraying opening, a bridge pipe and a bridge pipe lower flange, and the bridge pipe lower flange is connected with the upper flange to connect the gas pipeline and the ammonia spraying device together.

Has the advantages that: compared with the prior art, the utility model discloses the device can prevent on the one hand that raw coke oven gas from getting into the clearance between guide cylinder and the inner tube, and on the other hand when spouting ammonia device and breaking down, also can prevent simultaneously that the aqueous ammonia from entering into in the clearance of inside and outside urceolus to take place spiral heat transfer coil and heat-conducting layer and soaked the phenomenon that produces the corruption by the aqueous ammonia and take place. In addition, the positions of the upper flange and the lower flange of the riser heat exchanger can be guaranteed not to be influenced by the change of the working temperature.

Drawings

Fig. 1 is a schematic diagram of the main structure of the device of the present invention.

Fig. 2 is a partial enlarged view of the device of the present invention near the upper flange.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the scope of the invention. Modifications or substitutions made to the structure of the present invention do not depart from the spirit and substance of the present invention, and all belong to the scope of the present invention.

Examples

An ascending pipe heat exchanger for preventing ammonia water from flowing backwards, as shown in figures 1 and 2, comprises a raw coke oven gas pipeline 1, an upper flange 2, a lower flange 3, a spiral heat exchange coil 4, a lower inlet and a lower outlet 5 and an upper inlet and a lower outlet 6 of a heat exchange medium, and a guide cylinder 7; the raw coke oven gas pipeline 1 sequentially comprises an outer cylinder body 11, a heat insulation layer 12, a heat conduction layer 13 and an inner cylinder body 14 from outside to inside; the bottom of the upper flange 2 is welded with the top of the outer cylinder body 11, and an expansion space is reserved between the bottom of the upper flange and the top of the inner cylinder wall 14; the lower flange 3 is respectively welded with the bottom of the outer cylinder body 11 and the bottom of the inner cylinder body 14; the spiral heat exchange coil 4 is arranged in the heat conduction layer 13, and an opening at one end is connected with the lower inlet and outlet 5, and an opening at the other end is connected with the upper inlet and outlet 6; the bottom of the upper flange 2 is welded with a guide cylinder 7 which extends vertically and downwards, the guide cylinder 7 is positioned inside the crude gas pipeline 1, and a sealing ring 8 is arranged in a gap between the guide cylinder 7 and the inner cylinder 14.

The lower inlet and outlet 5 is arranged on the lower side wall of the raw gas pipeline 1 and penetrates through the outer cylinder 11 and the heat insulation layer 12, and the upper inlet and outlet 6 is arranged on the upper side wall of the raw gas pipeline 1 and penetrates through the outer cylinder 11 and the heat insulation layer 12. The lower inlet and outlet 5 is a water or low-temperature heating medium inlet or a high-temperature steam outlet; the upper inlet and outlet 6 is a steam-water mixture or a low-temperature heating medium outlet or a low-temperature steam inlet.

The number of the guide cylinders 7 and the sealing rings 8 is two.

The side wall of the outer cylinder body 11 of the raw gas pipeline 1 is also provided with a leakage detecting pipe 9.

The crude gas pipeline 1 further comprises a group of straight fins 15 which are fixed on the inner side wall of the inner cylinder body 14, and an expansion space is reserved between the top of the straight fins and the bottom of the guide cylinder 7.

The ammonia spraying device 10 is arranged on the upper part of the crude gas pipeline 1, the ammonia spraying device 10 comprises an ammonia spraying opening 101, a bridge pipe 102 and a bridge pipe lower flange 103, the bridge pipe lower flange 103 is connected with the upper flange 2, and the gas pipeline 1 is connected with the ammonia spraying device 10.

When the raw coke oven gas pipeline is used as a steam superheater, the upper end of the heat exchange coil is a low-temperature steam inlet, and the lower end of the heat exchange coil is a high-temperature steam outlet; when the evaporator is used, the lower end of the heat exchange coil is a water inlet, the upper end of the heat exchange coil is a saturated steam outlet, different materials can be selected for the heat exchange coil according to different functions, the number of the heat exchange coil can be larger than two, and the number of the heat exchange coil is determined according to the required functions, the flow speed and the flow resistance of steam.

The upper end of the barrel 14 in the ascending pipe through which the raw gas flows is of a free expansion structure (enough expansion height space is reserved between the upper end and the upper flange 2). The inner side of an upper flange 2 of the ascending pipe heat exchanger is welded with a guide cylinder 7 which is arranged inside the wall of the crude gas cylinder and can expand downwards during working. Set up sealing washer 8 in the clearance between guide cylinder 7 and the interior barrel 14, can prevent on the one hand that raw coke oven gas from getting into, on the other hand, when the bridge pipe department of tedge top spouts the ammonia device to break down, the aqueous ammonia that drops downwards in the interior barrel can flow downwards along guide cylinder 7, and the sealing action of sealing washer 8 has prevented the aqueous ammonia to enter into in the clearance of inside and outside barrel to spiral heat transfer coil 4 and heat-conducting layer 13 in the clearance of interior outer barrel from being soaked by the aqueous ammonia and produce the phenomenon of corroding and take place. The height of the straight fins 15 cannot reach the guide cylinder 7, and an axial expansion height of the guide cylinder 7 is left between the straight fins and the guide cylinder. The positions of the upper flange and the lower flange of the riser heat exchanger can be ensured not to be influenced by the change of the working temperature.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The ascending pipe heat exchanger capable of preventing ammonia water from flowing backwards is characterized by comprising a crude gas pipeline (1), an upper flange (2), a lower flange (3), a spiral heat exchange coil (4), a lower inlet and outlet (5) and an upper inlet and outlet (6) of a heat exchange medium and a guide cylinder (7); the raw coke oven gas pipeline (1) sequentially comprises an outer cylinder body (11), a heat insulation layer (12), a heat conduction layer (13) and an inner cylinder body (14) from outside to inside; the bottom of the upper flange (2) is welded with the top of the outer cylinder (11), and an expansion space is reserved between the bottom of the upper flange and the top of the inner cylinder (14); the lower flange (3) is respectively welded with the bottom of the outer cylinder body (11) and the bottom of the inner cylinder body (14); the spiral heat exchange coil (4) is arranged in the heat conducting layer (13), and an opening at one end is connected with the lower inlet and outlet (5), and an opening at the other end is connected with the upper inlet and outlet (6); the bottom welding of going up flange (2) has guide cylinder (7) of perpendicular downwardly extending, and guide cylinder (7) are located inside raw coke oven gas pipeline (1) to be equipped with sealing washer (8) in the clearance between guide cylinder (7) and interior barrel (14).

2. The ascending tube heat exchanger for preventing ammonia water from flowing backward as claimed in claim 1, wherein the lower inlet/outlet (5) is provided at a lower side wall of the raw gas pipe (1) and penetrates through the outer cylinder (11) and the insulating layer (12), and the upper inlet/outlet (6) is provided at an upper side wall of the raw gas pipe (1) and penetrates through the outer cylinder (11) and the insulating layer (12).

3. The ascending tube heat exchanger for preventing ammonia water from flowing backward as claimed in claim 1, wherein the number of said guide cylinders (7) and said seal rings (8) is two.

4. The ascending tube heat exchanger for preventing ammonia water from flowing backwards as claimed in claim 1, wherein a leakage detecting tube (9) is further disposed on the side wall of the outer cylinder (11) of the crude gas pipeline (1).

5. The ascending tube heat exchanger for preventing ammonia water from flowing backward as claimed in claim 1, further comprising a set of straight fins (15), wherein the set of straight fins (15) is fixed on the inner side wall of the inner cylinder (14) and an expansion space is left between the top of the set of straight fins (15) and the bottom of the guide cylinder (7).

6. The ascending tube heat exchanger for preventing ammonia water from flowing backwards according to claim 1, wherein the ammonia spraying device (10) is arranged at the upper part of the crude gas pipeline (1), the ammonia spraying device (10) comprises an ammonia spraying opening (101), a bridge tube (102) and a bridge tube lower flange (103), and the bridge tube lower flange (103) is connected with the upper flange (2) to connect the gas pipeline (1) and the ammonia spraying device (10) together.