CN216998274U

CN216998274U - Can be able to bear rising pipe heat exchanger of ordinary pressure dry combustion method type

Info

Publication number: CN216998274U
Application number: CN202123087559.7U
Authority: CN
Inventors: 杨桂兰; 唐文俊
Original assignee: Nanjing Huadian Energy Saving And Environmental Protection Co ltd
Current assignee: Nanjing Huadian Energy Saving And Environmental Protection Co ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-07-19
Anticipated expiration: 2031-12-09

Abstract

The utility model provides a normal pressure dry burning resistant type ascending pipe heat exchanger, which comprises an outer cylinder, a heat conducting layer, an inner cylinder and a guide cylinder from outside to inside in sequence; the lower surface of the upper flange is connected with the tops of the outer cylinder and the guide cylinder, a sealing ring is arranged between the inner cylinder and the guide cylinder to seal raw coke oven gas in the inner cylinder, and the lower flange is connected with the bottom of the outer cylinder and the bottom of the inner cylinder; the heat exchange coil is arranged in the heat conduction layer and is in a spiral ascending state, and the bottom opening end and the top opening end of the heat exchange coil penetrate through the heat conduction layer and the outer barrel and extend to the outside of the heat exchanger; the bottom opening end of the heat exchange coil is designed into a three-way pipe, a first valve is arranged near one opening, and a detachable sealing nut is arranged at the other opening, namely a third opening; and a second valve is arranged near the opening of the top opening end, and an exhaust vent valve is arranged on the pipeline of the top opening end between the second valve and the outer barrel. The equipment has simple structure and convenient use, and can play a cooling and protecting role on the material of the ascending pipe heat exchanger.

Description

Can be able to bear rising pipe heat exchanger of ordinary pressure dry combustion method type

Technical Field

The utility model belongs to the field of coke oven equipment, and particularly relates to a riser pipe heat exchanger for recovering crude gas waste heat of a riser pipe of a coke oven, which can resist normal pressure dry burning.

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 circulating ammonia water at 70-75 ℃ is sprayed to the high-temperature raw gas to cool the high-temperature raw gas, so that waste heat recovery is realized, however, the high-temperature raw gas brings heat and is wasted due to the large amount of evaporation of the circulating ammonia water.

In the 80 s of the 20 th century, most of the coke plants in japan used conduction oil for riser recovery of raw gas to bring out heat: the riser is made into a jacketed pipe, heat conduction oil indirectly exchanges heat with high-temperature raw coke oven gas through the jacketed pipe, and the heated high-temperature heat conduction oil can be used for multiple purposes, such as ammonia distillation, coal tar distillation, dry coal as fired and the like. Later, Ji Steel had performed similar tests on five-hole risers; wu Steel, horse Steel, saddle Steel, ripple Steel, Beijing coking plant, Shenyang gas two plants, Ben Steel one iron, Flat topping coal plant and other enterprises used water vaporization cooling technology to recover the heat in the riser; in addition, enterprises also adopt a method of indirect heat exchange with high-temperature raw coke oven gas by taking nitrogen as a medium.

The existing coke oven riser crude gas waste heat recovery heat exchanger has a good heat exchange effect, can effectively reduce the heat dissipation loss of equipment, but can effectively reduce the heat loss of the equipment because the coke oven is not stopped, when the fault condition of the riser heat exchanger occurs and a cold source medium needs to be cut off, the heat source crude gas continuously passes through the riser heat exchanger, so that the riser heat exchanger is dried, the material of the riser heat exchanger is damaged, the service life of the riser heat exchanger is influenced, and heat loss can be caused.

SUMMERY OF THE UTILITY MODEL

The technical problem is as follows: in order to solve the defects of the prior art, the utility model provides a riser heat exchanger capable of resisting normal-pressure dry burning.

The technical scheme is as follows: the utility model provides a normal pressure dry burning resistant ascending pipe heat exchanger, which comprises a heat exchanger pipeline, an upper flange, a lower flange and a spiral heat exchange coil pipe, wherein the upper flange is arranged on the upper end of the heat exchanger pipeline; the heat exchanger pipeline sequentially comprises an outer cylinder, a heat conduction layer and an inner cylinder from outside to inside; the upper flange is connected with the top of the outer cylinder, the lower surface of the upper flange is provided with a guide cylinder, a gap is reserved between the guide cylinder and the heat conducting layer, the top of the inner cylinder is inserted into the gap, a sealing gasket is arranged between the inner side wall of the inner cylinder and the outer side wall of the guide cylinder for sealing, and the lower flange is connected with the bottom of the outer cylinder and the bottom of the inner cylinder; the spiral heat exchange coil is arranged in the heat conduction layer and is in a spiral ascending state, and the bottom opening end and the top opening end of the spiral heat exchange coil penetrate through the heat conduction layer and the outer barrel and extend to the outside of a heat exchanger pipeline; the bottom opening end of the spiral heat exchange coil is designed into a three-way pipe, a first valve is arranged near one opening, and a detachable sealing nut is arranged at the other opening, namely a third opening; and a second valve is arranged near the opening of the top opening end of the spiral heat exchange coil, and an exhaust blow-down valve is arranged on the pipeline of the top opening end between the second valve and the outer barrel.

As a preferable or improved scheme:

the third port comprises a pipe body, a sealing ring and a detachable sealing nut, wherein an external thread is arranged on the outer surface of the opening end of the pipe body, and an internal thread matched with the external thread is arranged on the inner wall of the sealing nut.

Or, the third port includes body, sealing washer and detachable sealing nut, and body open end internal surface is equipped with the internal thread, and the outer wall of sealing nut screw rod is equipped with the external screw thread with above-mentioned internal thread assorted.

The ascending tube heat exchanger capable of resisting normal pressure dry burning further comprises a group of straight fins, and the group of straight fins are fixed on the inner side wall of the inner barrel.

The normal pressure dry burning resistant ascending pipe heat exchanger further comprises a leakage detecting pipe, wherein one end opening of the leakage detecting pipe penetrates through the outer cylinder, and the other end opening of the leakage detecting pipe is arranged outside a pipeline of the heat exchanger.

The top of the inner cylinder is a free end which is inserted into a gap between the guide cylinder and the heat conduction layer, and the design enables the inner cylinder and the guide cylinder to freely slide up and down in a sealing manner at high temperature respectively, so that crude gas in the inner cylinder is prevented from leaking into the heat conduction layer. The whole ascending pipe heat exchanger is loaded through the outer cylinder, and the outer cylinder cannot cause a large amount of upward expansion of the whole ascending pipe heat exchanger due to low temperature.

When the raw coke oven gas waste heat recovery system of the coke oven ascension pipe using water or heat conducting oil as a cold source encounters sudden accidents such as power failure, the circulating pump stops working, the water circulation or heat conducting oil circulation is interrupted, the ascension pipe heat exchanger faces dry burning, the first valve and the second valve can be closed, the threaded sealing port and the exhaust emptying valve are opened, normal-temperature compressed air is introduced into the threaded sealing port, the ascension pipe heat exchanger is cooled, and the ascension pipe heat exchanger is protected from being damaged.

Has the advantages that: compared with the prior art, the normal pressure dry combustion resistant type ascending pipe heat exchanger provided by the utility model has the advantages that the structure is simple, the cost is low, the use is convenient, the design of the three-way threaded sealing pipe orifice and the exhaust blow-off valve can enable normal temperature compressed air to enter the spiral coil pipe from the three-way threaded sealing pipe orifice and be discharged from the exhaust blow-off valve, so that the ascending pipe heat exchanger is cooled, the material of the ascending pipe heat exchanger is cooled, and the ascending pipe heat exchanger is protected.

Drawings

FIG. 1 is a schematic view showing the construction of a riser heat exchanger of the present invention which can withstand normal pressure dry combustion.

FIG. 2 is a schematic view of the structure of a three-way pipe opening of the ascending pipe heat exchanger capable of resisting normal pressure dry combustion according to the present invention.

FIG. 3 is a schematic structural view of another embodiment of a three-way nozzle in the normal pressure dry combustion resistant type ascending tube heat exchanger according to the present invention.

Detailed Description

The utility model further discloses a crude gas waste heat recovery heat exchanger of a coke oven ascending pipe capable of resisting normal pressure dry burning.

Example 1

A kind of rising pipe heat exchanger that can bear the dry burning type of the normal pressure, as shown in figure 1, including heat exchanger pipeline 1, upper flange 2, lower flange 3 and spiral heat exchange coil 4; the heat exchanger pipeline 1 sequentially comprises an outer cylinder 11, a heat conducting layer 12 and an inner cylinder 13 from outside to inside; the upper flange 2 is connected with the top of the outer cylinder 11, the lower surface of the upper flange 2 is provided with a guide cylinder 9, a gap is reserved between the guide cylinder 9 and the heat conducting layer 12, the top of the inner cylinder 13 is inserted into the gap, a sealing gasket is arranged between the inner side wall of the inner cylinder 13 and the outer side wall of the guide cylinder 9 for sealing, and the lower flange 3 is connected with the bottom of the outer cylinder 11 and the bottom of the inner cylinder 13; the heat exchange spiral coil 4 is arranged in the heat conduction layer 12 and is in a spiral ascending state, and the bottom opening end 5 and the top opening end 6 of the heat exchange spiral coil penetrate through the heat conduction layer 12 and the outer barrel 11 and extend to the outside of the heat exchanger pipeline 1; the bottom opening end 5 of the heat exchange spiral coil 4 is designed into a three-way pipe, a first valve 51 is arranged near one opening, and a detachable sealing nut is arranged at the other opening, namely a third opening 52; a second valve 61 is arranged near the opening of the top opening end 6 of the heat exchange spiral coil 4, and an exhaust air release valve 62 is arranged on the pipeline of the top opening end 6 and between the second valve 61 and the outer barrel 11.

As shown in fig. 2, the third port 52 includes a pipe 521, a sealing ring 522 and a detachable sealing nut 523, wherein an external thread is disposed on an outer surface of an opening end of the pipe 521, and an internal thread matched with the external thread is disposed on an inner wall of the sealing nut 523.

As shown in fig. 3, as another alternative, the third port 52 includes a tube 521, a sealing ring 522 and a detachable sealing nut 523, wherein an internal thread is provided on an inner surface of an open end of the tube 521, and an external thread matching the internal thread is provided on an outer wall of a screw of the sealing nut 523.

The ascending tube heat exchanger also comprises a group of straight fins 7 which are fixed on the inner side wall of the inner cylinder 13.

The ascending tube heat exchanger also comprises a leakage detecting tube 8, wherein one end opening of the leakage detecting tube 8 penetrates through the outer cylinder 11, and the other end opening is arranged outside the heat exchanger pipeline 1.

The top of the inner cylinder is a free end which is inserted into a gap between the guide cylinder and the heat conduction layer, and the design enables the inner cylinder and the guide cylinder to freely slide up and down in a sealing manner at high temperature respectively, so that crude gas in the inner cylinder is prevented from leaking into the heat conduction layer. The whole ascending pipe heat exchanger bears the weight through the outer cylinder, and the outer cylinder cannot cause a large amount of upward expansion of the ascending pipe heat exchanger due to low temperature.

The working principle of the ascending pipe heat exchanger capable of resisting normal pressure dry burning is as follows:

raw coke oven gas flows through the inner barrel 13, the raw coke oven gas is a heat source, and a cold source medium comprises: water, heat conducting oil and steam flow through the spiral heat exchange coil 4.

Water or low-temperature heat conducting oil enters from the bottom opening end 5 of the spiral heat exchange coil 4 of the heat exchanger, and is changed into a steam-water mixture or high-temperature heat conducting oil after heat absorption, and is discharged from the top opening end 6 of the spiral heat exchange coil 4 of the heat exchanger.

The low-temperature steam enters from the top opening end 6 of the heat exchanger spiral heat exchange coil 4, and the high-temperature steam which is changed after heat absorption is discharged from the bottom opening end 5 of the heat exchanger spiral heat exchange coil 4.

As the coke oven is not stopped, when power failure occurs or the riser heat exchanger has a fault and the cold source medium needs to be cut off, the heat source crude gas continuously passes through the riser heat exchanger, the first valve 51 and the second valve 61 can be closed, dry burning of the riser heat exchanger can be caused, the material of the riser heat exchanger is damaged, and the service life of the riser heat exchanger is influenced.

At the moment, the three-way pipe opening (the third opening 52) and the exhaust blow-down valve 62 can be opened, the inside of the spiral heat exchange coil 4 is under the normal pressure condition communicated with the atmosphere, the screw cap of the three-way pipe opening is removed, the three-way pipe opening is connected with the compressed air at the top of the coke oven through a hose, the compressed air at normal temperature can enter the spiral heat exchange coil 4 from the three-way pipe opening and is discharged at the exhaust blow-down valve 62, and the temperature of the ascending pipe heat exchanger is reduced. The material of the ascending tube heat exchanger is cooled, and the ascending tube heat exchanger is protected.

After the fault is removed, the compressed air at the three-way pipe port is cut off, the sealing nut 523 is installed and screwed down, and the first valve 51, the exhaust air release valve 62 and the second valve 61 are opened in sequence, so that the ascending pipe heat exchanger returns to normal use.

Claims

1. A rising pipe heat exchanger capable of resisting normal pressure dry burning is characterized by comprising a heat exchanger pipeline (1), an upper flange (2), a lower flange (3) and a spiral heat exchange coil (4); the heat exchanger pipeline (1) sequentially comprises an outer cylinder (11), a heat conducting layer (12) and an inner cylinder (13) from outside to inside; the upper flange (2) is connected with the top of the outer cylinder (11), the lower surface of the upper flange (2) is provided with a guide cylinder (9), a gap is reserved between the guide cylinder (9) and the heat conducting layer (12), the top of the inner cylinder (13) is inserted into the gap, a sealing gasket is arranged between the inner side wall of the inner cylinder (13) and the outer side wall of the guide cylinder (9) for sealing, and the lower flange (3) is connected with the bottom of the outer cylinder (11) and the bottom of the inner cylinder (13); the spiral heat exchange coil (4) is arranged in the heat conduction layer (12) and is in a spiral ascending state, and the bottom opening end (5) and the top opening end (6) of the spiral heat exchange coil penetrate through the heat conduction layer (12) and the outer barrel (11) and extend to the outside of the heat exchanger pipeline (1); the bottom opening end (5) of the spiral heat exchange coil (4) is designed into a three-way pipe, a first valve (51) is arranged near one opening, and a detachable sealing nut is arranged at the other opening, namely a third opening (52); and a second valve (61) is arranged near the opening of the top opening end (6) of the spiral heat exchange coil (4), and an exhaust air release valve (62) is arranged between the second valve (61) and the outer barrel (11) on a pipeline of the top opening end (6).

2. The uprising pipe heat exchanger of claim 1, wherein the third port (52) comprises a pipe body (521), a sealing ring (522) and a detachable sealing nut (523), the outer surface of the open end of the pipe body (521) is provided with an external thread, and the inner wall of the sealing nut (523) is provided with an internal thread matching with the external thread.

3. The uprising pipe heat exchanger as claimed in claim 1, wherein the third port (52) comprises a pipe body (521), a sealing ring (522) and a detachable sealing nut (523), the inner surface of the open end of the pipe body (521) is provided with an internal thread, and the outer wall of the screw of the sealing nut (523) is provided with an external thread matching the internal thread.

4. The uprising pipe heat exchanger of normal pressure dry combustion type as claimed in claim 1, further comprising a set of straight fins (7), wherein the set of straight fins (7) is fixed on the inner sidewall of the inner tube (13).

5. The uprising pipe heat exchanger of normal pressure dry combustion type as claimed in claim 1, further comprising a leak detection pipe (8), wherein one end of said leak detection pipe (8) is opened through the outer tube (11), and the other end is opened outside the heat exchanger pipe (1).