Heat exchange device for methanated natural gas preparation system

Abstract

The invention relates to the technical field of heat exchange devices, in particular to a heat exchange device for a methanated natural gas preparation system, which comprises a heat exchange box, and further comprises a heat exchange mechanism arranged in the heat exchange box; the heat exchange mechanism comprises a first top plate and a second top plate which are fixedly connected to the outer wall of the top end of the heat exchange box, a first bottom plate and a second bottom plate are fixedly connected to the outer wall of the bottom end of the heat exchange box, an outer pipe is fixedly connected to the inner wall of the bottom of the heat exchange box, and an inner pipe is fixedly connected to the inner wall of the top of the heat exchange box. A plurality of first mounting holes are formed in the outer wall of the top end of the outer pipe, second vertical pipes are fixedly connected to the inner walls of the first mounting holes, and a plurality of second mounting holes are formed in the outer wall of the bottom end of the inner pipe; the problems that the hot gas passing speed is too high, the moving mode is not fixed, and the heat exchange stability is poor are solved, heat in the hot gas is fully utilized, the heat exchange space utilization rate is high, and the heat exchange efficiency of the heat exchange device for the methanated natural gas preparation system is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of heat exchange devices, and particularly relates to a heat exchange device for a methanation natural gas preparation system. BACKGROUND

[0002] A three-tower series connection mode is usually used in a methanation process, that is, three reactors are connected in series, and a waste heat exchange device is arranged at the outlet of each reactor. The waste heat exchange device is used for transferring the heat released in the conversion reaction process. However, when the existing heat exchange device reaches the specified temperature by absorbing heat from cold water, the heat exchange needs to be stopped to alternate hot water and cold water, thereby reducing the heat exchange efficiency.

[0003] According to the search of the Chinese patent with the announcement number CN218155648U, a heat exchange device for a methanation natural gas preparation system is disclosed. The heat exchange box is divided into a plurality of heat exchange cavities. Each heat exchange cavity is correspondingly provided with a temperature controller, a liquid level sensor, a cold water control valve and a hot water control valve. Each heat exchange cavity is correspondingly provided with a control mechanism for controlling the opening and closing of the cold water control valve and the hot water control valve. When the temperature controller in one of the heat exchange cavities reaches the set temperature value, the controller controls the corresponding hot water control valve to open, and the hot water in the corresponding heat exchange cavity is discharged. The liquid level is detected by the liquid level sensor. When the set value is reached, the controller controls the hot water control valve to close and controls the corresponding cold water control valve to open, so as to supplement the cold water into the empty heat exchange cavity to continue the heat exchange. In the process of replacing the hot water with the cold water, the heat exchange does not need to be stopped, and the hot gas can continue to be exchanged through other heat exchange cavities, so that the heat exchange efficiency can be improved.

[0004] Based on the above search and the prior art, it is found that the above patent has some defects. The hot gas moves at a too high speed, the moving mode is not fixed, the heat exchange stability is poor, part of the heat in the hot gas cannot be utilized, and the heat exchange space utilization rate is low due to the multiple heat exchange structures, thereby reducing the heat exchange efficiency of the heat exchange device for the methanation natural gas preparation system. SUMMARY

[0005] The application aims to provide a heat exchange device for a methanation natural gas preparation system to solve the problems in the background art.

[0006] The technical scheme of the application is as follows: a heat exchange device for a methanation natural gas preparation system, comprising a heat exchange box, and further comprising:

[0007] A heat exchange mechanism is arranged in the heat exchange box.

[0008] The heat exchange mechanism comprises a top plate one and a top plate two fixedly connected to the outer wall of the top end of the heat exchange box, the outer wall of the bottom end of the heat exchange box is fixedly connected with a bottom plate one and a bottom plate two, the inner wall of the bottom of the heat exchange box is fixedly connected with an outer pipe, the inner wall of the top of the heat exchange box is fixedly connected with an inner pipe, the outer wall of the top end of the outer pipe is provided with a plurality of mounting holes one, the inner wall of the mounting hole one is fixedly connected with a vertical pipe two, the outer wall of the bottom end of the inner pipe is provided with a plurality of mounting holes two, the inner wall of the mounting hole two is fixedly connected with a vertical pipe one, the outer wall of the outer pipe is fixedly connected with a spiral blade one, the outer wall of the inner pipe is fixedly connected with a spiral blade two, the inner wall of the top of the heat exchange box is fixedly connected with a wind guide plate one, and the inner wall of the bottom of the heat exchange box is fixedly connected with a wind guide plate two.

[0009] Preferably, the outer wall of the wind guide plate one and the wind guide plate two is provided with a wind guide groove, the size of the wind guide groove is matched with that of the outer pipe and the inner pipe, and the vertical pipe one and the vertical pipe two are arranged in an annular array.

[0010] Preferably, the vertical pipe two is fixedly connected to the inner wall of the top plate one and the bottom plate one, and the vertical pipe one is fixedly connected to the inner wall of the top plate two and the bottom plate two.

[0011] Preferably, one side of the outer wall of the bottom of the heat exchange box is provided with an air inlet pipe, the outer wall of the top end of the heat exchange box is provided with an air outlet pipe, and the size of the air outlet pipe is matched with that of the inner pipe.

[0012] Preferably, the spiral blade one is fixedly connected to the inner wall of the heat exchange box, the spiral blade two is fixedly connected to the inner wall of the outer pipe, and the outer wall of the outer pipe and the inner pipe is provided with a heat exchange plate.

[0013] Preferably, the outer wall of both sides of the bottom end of the heat exchange box is fixedly connected with a supporting leg, the outer wall of the top end of the top plate one and the top plate two is provided with a water injection pipe, the outer wall of the bottom end of the bottom plate one and the bottom plate two is provided with a drain pipe, and the outer wall of the water injection pipe and the drain pipe is provided with a control valve.

[0014] The heat exchange device for the methanation natural gas preparation system is improved, and compared with the prior art, has the following improvements and advantages:

[0015] One: the heat exchange box, outer tube, inner tube, vertical pipe one, vertical pipe two, spiral blade one and spiral blade two are arranged, the spiral blade two forces the gas to descend along the spiral path, further contacts the outer wall of the inner tube and the heat exchange plate, secondary heat exchange is completed, the top of the heat exchange box is provided with a water injection pipe, the bottom is provided with a drain pipe, the cooling water is injected through the water injection pipe, enters the inside of the vertical pipe one and the vertical pipe two, forms circulation in the heat exchange box, the high-temperature gas is guided by the spiral blade one and the spiral blade two, indirectly exchanges heat with the cooling water, after the heat is absorbed by the water, the cold water gradually warms up to hot water, and finally is discharged through the drain pipe, the problems of too fast moving speed of hot gas, unstable moving mode and poor heat exchange stability are solved, the heat in the hot gas is fully utilized, the heat exchange efficiency of the heat exchange device for the methanation natural gas preparation system is improved, the heat exchange space utilization is high, and the heat exchange efficiency of the heat exchange device for the methanation natural gas preparation system is improved;

[0016] Secondly, the air guide plate one and the air guide plate two are arranged, the moving gas is guided to move stably in the heat exchange box for heat exchange treatment, local vortex is avoided, and the stability of the heat exchange device for the methanation natural gas preparation system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application will be further explained in combination with the drawings and embodiments:

[0018] Figure 1 is the overall structure section schematic view of the application;

[0019] Figure 2 is the outer tube schematic view of the application;

[0020] Figure 3 is the spiral blade one schematic view of the application;

[0021] Figure 4 is the vertical pipe two schematic view of the application;

[0022] Figure 5 is the inner tube schematic view of the application;

[0023] Figure 6 is the air guide plate one schematic view of the application.

[0024] BRIEF DESCRIPTION OF DRAWINGS:

[0025] 1, heat exchange box; 2, air inlet pipe; 3, foot; 4, outer tube; 5, spiral blade one; 6, air guide plate one; 7, top plate one; 8, water injection pipe; 9, inner tube; 10, spiral blade two; 11, vertical pipe one; 12, air guide plate two; 13, bottom plate one; 14, drain pipe; 15, vertical pipe two; 16, heat exchange plate; 17, top plate two; 18, air outlet pipe; 19, bottom plate two; 20, air guide groove. DETAILED DESCRIPTION

[0026] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This invention provides an improved heat exchange device for a methanation natural gas production system. The technical solution of this invention is as follows:

[0028] like Figures 1-6 As shown, a heat exchange device for a methanation natural gas production system includes a heat exchange box 1, and further includes:

[0029] The heat exchange mechanism is located inside the heat exchange box 1;

[0030] The heat exchange mechanism includes a top plate 17 and a top plate 27 fixedly connected to the outer wall of the top of the heat exchange box 1; a bottom plate 13 and a bottom plate 29 fixedly connected to the outer wall of the bottom of the heat exchange box 1; an outer tube 4 fixedly connected to the inner wall of the bottom of the heat exchange box 1; an inner tube 9 fixedly connected to the inner wall of the top of the heat exchange box 1; several mounting holes 1 are opened on the outer wall of the top of the outer tube 4; a riser 2 15 is fixedly connected to the inner wall of the mounting holes 1; several mounting holes 2 are opened on the outer wall of the bottom of the inner tube 9; a riser 11 is fixedly connected to the inner wall of the mounting holes 2; a spiral blade 15 is fixedly connected to the outer wall of the outer tube 4; a spiral blade 2 10 is fixedly connected to the outer wall of the inner tube 9; and the top inner wall of the heat exchange box 1 is fixedly connected to... There is a guide plate 6, and a guide plate 12 is fixedly connected to the bottom inner wall of the heat exchange box 1. After the gas rises to the top, it changes its flow direction under the guidance of the guide plate 6. The guide groove 20 on the guide plate ensures that the airflow is evenly distributed and avoids local eddies. The gas then enters the annular channel between the inner tube 9 and the outer tube 4. There is a spiral blade 10 here. The spiral blade 10 forces the gas to descend along the spiral path and further contact the outer wall of the inner tube 9 and the heat exchange plate 16 to complete the secondary heat exchange. The top of the heat exchange box 1 is equipped with a water injection pipe 8 and the bottom is equipped with a drain pipe 14. Cooling water is injected through the water injection pipe 8 and enters the interior of the riser 11 and riser 2 15 to form a circulation in the heat exchange box 1.

[0031] Furthermore, the outer walls of the first air guide plate 6 and the second air guide plate 12 are provided with air guide grooves 20, which are adapted to the size of the outer pipe 4 and the inner pipe 9. The first vertical pipe 11 and the second vertical pipe 15 are arranged in a ring array. The second vertical pipe 15 is fixedly connected to the inner walls of the first top plate 7 and the first bottom plate 13, and the first vertical pipe 11 is fixedly connected to the inner walls of the second top plate 17 and the second bottom plate 19.

[0032] Further, the side outer wall of the bottom of the heat exchange box 1 is provided with an air inlet pipe 2, the top end outer wall of the heat exchange box 1 is provided with an air outlet pipe 18, the air outlet pipe 18 is matched with the size of the inner pipe 9, the spiral blade one 5 is fixedly connected to the inner wall of the heat exchange box 1, the spiral blade two 10 is fixedly connected to the inner wall of the outer pipe 4, the outer walls of the outer pipe 4 and the inner pipe 9 are provided with heat exchange plates 16, the bottom end outer walls of both sides of the heat exchange box 1 are fixedly connected with supporting legs 3, the top end outer walls of the top plate one 7 and the top plate two 17 are provided with water injection pipes 8, the bottom end outer walls of the bottom plate one 13 and the bottom plate two 19 are provided with water drainage pipes 14, and the outer walls of the water injection pipes 8 and the water drainage pipes 14 are provided with control valves.

[0033] Working principle: The high-temperature process gas enters the bottom of the heat exchange box 1 through the air inlet pipe 2, the gas first enters the annular space between the outer pipe 4 and the inner wall of the heat exchange box, and the spiral blade one 5 is arranged in the annular space, the spiral blade one 5 guides the gas to rise along the spiral path, prolongs the residence time of the gas in the heat exchange area, and at the same time, the gas is in full contact with the inner wall of the heat exchange box 1 and the heat exchange plates 16 to carry out preliminary heat exchange, the gas rises to the top and changes the flow direction under the guidance of the air deflector one 6, the air deflector groove 20 on the air deflector ensures that the airflow is uniformly distributed, avoiding local vortex, the gas then enters the annular channel between the inner pipe 9 and the outer pipe 4, and the spiral blade two 10 is arranged in the annular channel, the spiral blade two 10 forces the gas to descend along the spiral path, further contacts the outer wall of the inner pipe 9 and the heat exchange plates 16 to complete secondary heat exchange, the heat exchange box 1 is provided with the water injection pipe 8 at the top and the water drainage pipe 14 at the bottom, the cooling water is injected through the water injection pipe 8, enters the inside of the vertical pipe one 11 and the vertical pipe two 15, and forms a circulation in the heat exchange box 1, the high-temperature gas is indirectly exchanged with the cooling water under the guidance of the spiral blade one 5 and the spiral blade two 10, the heat is absorbed by the water, and the cold water gradually warms up to hot water, and finally is discharged through the water drainage pipe 14, after two spiral heat exchanges, the gas rises along the inner pipe 9, the temperature of the gas in the inner pipe 9 has been significantly reduced, and finally is discharged from the system through the air outlet pipe 18, in this process, the heat of the gas is fully recovered, and the energy utilization efficiency is improved.

[0034] The technical means disclosed in the scheme of the application is not limited to the technical means disclosed in the above technical means, and also includes the technical scheme composed of the equivalent replacement of the above technical features. The unfinished matters of the application belong to the common knowledge of those skilled in the art.

Claims

1. A heat exchange device for a methanation natural gas production system, comprising a heat exchange box (1), characterized in that: Also include: Heat exchange mechanism, the heat exchange mechanism is arranged in the heat exchange box (1) inside; The heat exchange mechanism includes top plate one (7) and top plate two (17) fixedly connected to the top end outer wall of the heat exchange box (1), the bottom end outer wall of the heat exchange box (1) is fixedly connected with bottom plate one (13) and bottom plate two (19), the bottom inner wall of the heat exchange box (1) is fixedly connected with outer tube (4), the top inner wall of the heat exchange box (1) is fixedly connected with inner tube (9), the top end outer wall of the outer tube (4) is provided with a plurality of mounting holes one, the inner wall of the mounting hole one is fixedly connected with vertical pipe two (15), the bottom end outer wall of the inner tube (9) is provided with a plurality of mounting holes two, the inner wall of the mounting hole two is fixedly connected with vertical pipe one (11), the outer wall of the outer tube (4) is fixedly connected with spiral blade one (5), the outer wall of the inner tube (9) is fixedly connected with spiral blade two (10), the top inner wall of the heat exchange box (1) is fixedly connected with air deflector one (6), the bottom inner wall of the heat exchange box (1) is fixedly connected with air deflector two (12).

2. A heat exchange device for a methanation natural gas production system according to claim 1, characterized in that: The outer wall of the air deflector one (6) and the air deflector two (12) is provided with a wind guide groove (20), the wind guide groove (20) is matched with the size of the outer tube (4) and the inner tube (9), the vertical pipe one (11) and the vertical pipe two (15) are arranged in a ring shape.

3. A heat exchange device for a natural gas methanation system according to any one of claims 1-2, characterized in that: The vertical pipe two (15) is fixedly connected to the inner wall of the top plate one (7) and the bottom plate one (13), and the vertical pipe one (11) is fixedly connected to the inner wall of the top plate two (17) and the bottom plate two (19).

4. A heat exchange device for a methanation natural gas production system according to claim 1, characterized in that: One side of the bottom of the heat exchange box (1) is provided with an air inlet pipe (2), and the top end outer wall of the heat exchange box (1) is provided with an air outlet pipe (18), and the size of the air outlet pipe (18) is matched with the size of the inner tube (9).

5. A heat exchange device for a methanation natural gas production system according to claim 1, characterized in that: The spiral blade one (5) is fixedly connected to the inner wall of the heat exchange box (1), the spiral blade two (10) is fixedly connected to the inner wall of the outer tube (4), and the outer wall of the outer tube (4) and the inner tube (9) is provided with a heat exchange plate (16).

6. A heat exchange device for a methanation natural gas production system according to claim 1, characterized in that: The bottom end of the heat exchange box (1) is fixedly connected with the outer wall of the two sides, and the top end outer wall of the top plate one (7) and the top plate two (17) is provided with a water injection pipe (8), and the bottom end outer wall of the bottom plate one (13) and the bottom plate two (19) is provided with a drain pipe (14), and the outer wall of the water injection pipe (8) and the drain pipe (14) is provided with a control valve.

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