Low-failure-rate adsorption tower for nitrogen making system

Abstract

The utility model discloses a low failure rate adsorption tower for a nitrogen making system, which comprises a tower body arranged along the vertical direction, the bottom and the top of the tower body are respectively provided with a nitrogen making inlet and a nitrogen making outlet, and a nitrogen making molecular sieve is arranged in the tower body; the tower body is fixedly sleeved with the heat exchange cylinder, a heat exchange cavity is defined by the heat exchange cylinder and the tower body, a cooling inlet and a cooling outlet which communicate with the heat exchange cavity are formed in the heat exchange cylinder, and the cooling inlet is used for being connected with a cooling liquid conveying assembly; the heat exchange tube is arranged in the heat exchange cavity, and one end of the heat exchange tube is communicated with the nitrogen generation inlet. According to the low-failure-rate adsorption tower for the nitrogen making system, the heat exchange cavity is defined by the heat exchange cylinder and the tower body, and the heat exchange cavity is used for introducing cooling liquid, so that compressed air flowing in the heat exchange tube can be pre-cooled, heat of a molecular sieve in the tower body can be absorbed, normal and stable work of the molecular sieve is ensured, the service life is prolonged, and the nitrogen making efficiency and the nitrogen making purity are improved; in addition, the occupied area is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen production, in particular to a low failure rate adsorption tower used in a nitrogen production system. Background Art

[0002] The nitrogen generator uses air as raw material and utilizes the selective adsorption properties of a solid adsorbent to separate nitrogen and oxygen from the air. Therefore, in the nitrogen production system, the adsorption tower is an extremely important device.

[0003] During the nitrogen production process, the compressed air output by the air compressor increases in temperature after passing through the filter assembly to remove impurities such as oil, particles, etc. in the air, and the gas contacts the molecular sieve in the adsorption tower to generate a large amount of heat, which causes the molecular sieve to be damaged and prone to failure, thereby reducing the nitrogen production efficiency and purity. Therefore, a Chinese utility model with announcement number CN217490324U discloses a membrane separation pressure swing adsorption nitrogen making machine for the coal mining industry. The adsorption nitrogen making machine adopts a water pump, a heat exchanger, a spiral cooling pipe and a water trough structure to pre-cool the compressed air, thereby slowing down the temperature rise rate of the molecular sieve, enhancing the adsorption effect of the molecular sieve, and extending the service life of the molecular sieve.

[0004] However, the above device requires additional space to install a heat exchanger, a spiral cooling tube and a water trough, which increases the floor space. The above device can only pre-cool the compressed air before entering the adsorption tower, but cannot reduce the heat of the molecular sieve in the adsorption tower, resulting in limited temperature increase effect of the molecular sieve. After long-term use, the molecular sieve gradually heats up due to contact with the air, which affects the adsorption effect of the molecular sieve, increases the failure rate and shortens the service life of the molecular sieve.

[0005] Therefore, it is necessary to improve the adsorption tower in the nitrogen production system in the prior art. Utility Model Content

[0006] The utility model aims to overcome the defects in the prior art and provide a low failure rate adsorption tower for a nitrogen production system which reduces the floor space and ensures low failure rate, nitrogen production efficiency, nitrogen production purity and service life.

[0007] In order to achieve the above technical effects, the technical solution of the utility model is: a low failure rate adsorption tower for a nitrogen production system, comprising:

[0008] A tower body, wherein the tower body is arranged in a vertical direction, a nitrogen production inlet and a nitrogen production outlet are arranged at the bottom and the top of the tower body respectively, and a nitrogen production molecular sieve is arranged in the tower body;

[0009] A heat exchange cylinder, the heat exchange cylinder is fixedly sleeved outside the tower body and enclosed with the tower body to form a heat exchange cavity, the heat exchange cylinder is provided with a cooling inlet and a cooling outlet communicated with the heat exchange cavity, and the cooling inlet is used to connect a coolant delivery component;

[0010] A heat exchange tube, wherein the heat exchange tube is arranged in the heat exchange cavity and one end of the heat exchange tube is connected to the nitrogen production inlet.

[0011] Preferably, in order to enhance the pre-cooling effect on the air, the heat exchange tube is spiral.

[0012] Preferably, in order to enhance the heat exchange effect of the nitrogen-generating molecular sieve, the nitrogen-generating molecular sieve is located between the plane where the top end of the heat exchange chamber is located and the plane where the bottom end is located.

[0013] Preferably, in order to facilitate cooling of the coolant in the heat exchange cylinder, the circumferential outer edge of the heat exchange cylinder is provided with heat dissipation fins.

[0014] Preferably, in order to ensure that the cooling liquid fills the heat exchange cavity, the cooling inlet and the cooling outlet are respectively arranged at the bottom of the heat exchange cylinder and the top of the heat exchange cylinder.

[0015] Preferably, in order to facilitate cooling of the coolant and continuously deliver low-temperature coolant to the heat exchange chamber, the heat dissipation fins are distributed on the heat exchange tube along the circumference of the heat exchange tube, and the heat exchange tube and adjacent heat dissipation fins are enclosed to form a heat dissipation groove. The coolant delivery component includes a delivery pump and a cooling pool. The input end of the delivery pump is connected to the cooling pool, and the output end is connected to the cooling inlet. The top of the cooling pool is open to receive the coolant passing through the heat dissipation groove from top to bottom.

[0016] Preferably, in order to expand the contact area between the coolant and the outside and improve the cooling effect, a plurality of cooling outlets are provided, which are distributed at the top of the heat exchange tube along the circumference of the heat exchange tube.

[0017] Preferably, in order to further expand the heat exchange contact area between the coolant and the outside, a baffle ring is further provided on the top of the heat exchange cylinder, and the cooling outlet and the tower body are both provided on the inner side of the baffle ring.

[0018] Preferably, in order to prevent external debris from entering the cooling cavity through the cooling outlet, the baffle ring is fixed to the top of the heat exchange cylinder, a top ring is fixed above the baffle ring, the top ring and the bottom ring are gap-fitted and a sponge ring is provided between the two.

[0019] Preferably, in order to facilitate fixing the position of the sponge ring, the circumferential outer edge of the sponge ring is sealed against the circumferential inner wall of the bottom ring and is sandwiched between the heat exchange tube and the top ring.

[0020] In summary, compared with the prior art, the low failure rate adsorption tower for nitrogen production system of the utility model forms a heat exchange cavity by enclosing the heat exchange tube and the tower body. The heat exchange cavity is used to pass the coolant, which can not only pre-cool the compressed air flowing in the heat exchange tube, but also absorb the heat of the molecular sieve in the tower body, thereby ensuring the normal and stable operation of the molecular sieve, extending the service life, improving the nitrogen production efficiency and nitrogen production purity, and also reducing the occupied area. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the first embodiment;

[0022] Figure 2 is a schematic structural diagram of the first embodiment from another perspective;

[0023] Figure 3 yes Figure 1 Explosion diagram of

[0024] Figure 4 is a schematic structural diagram of a second embodiment;

[0025] Figure 5 yes Figure 4 A top view of

[0026] Figure 6 is a schematic structural diagram of a third embodiment;

[0027] Figure 7 yes Figure 6 Explosion diagram of

[0028] Figure 8 is a schematic structural diagram of a heat exchange tube according to a third embodiment;

[0029] In the figure: 1. tower body; 11. tower body; 111. nitrogen production inlet; 12. tower top; 121. nitrogen production outlet; 13. nitrogen production molecular sieve; 14. bolts; 15. nuts; 2. heat exchange cylinder; 21. cooling inlet; 22. cooling outlet; 23. heat dissipation fins; 24. baffle ring; 25. top ring; 26. sponge ring; 3. coolant delivery assembly; 31. delivery pump; 32. cooling pool; 4. heat exchange tube; 41. air inlet extension section; 42. air outlet extension section; 43. air guide pipe. DETAILED DESCRIPTION

[0030] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0031] First embodiment

[0032] like Figure 1-Figure 3As shown, the low failure rate adsorption tower for the bill making system of the first embodiment of the utility model comprises:

[0033] The tower body 1 is arranged in a vertical direction, and a nitrogen production inlet 111 and a nitrogen production outlet 121 are respectively arranged at the bottom and the top of the tower body 1, and a nitrogen production molecular sieve 13 is arranged in the tower body 1;

[0034] The heat exchange tube 2 is fixedly sleeved outside the tower body 1 and enclosed with the tower body 1 to form a heat exchange cavity. The heat exchange tube 2 is provided with a cooling inlet 21 and a cooling outlet 22 which are communicated with the heat exchange cavity. The cooling inlet 21 is used to connect the coolant delivery component 3;

[0035] The heat exchange tube 4 is disposed in the heat exchange cavity and one end of the heat exchange tube 4 is connected to the nitrogen production inlet 111 .

[0036] Specifically, the tower body 1 includes a tower body 11 with an open top and a tower top 12 covered on the top of the tower body 11, wherein the top outer edge of the tower body 11 is provided with a lower flange, and the bottom outer edge of the tower top 12 is provided with an upper flange, and the upper flange and the lower flange are fixedly connected by threaded bolts 14 and nuts 15, a nitrogen production inlet 111 is provided at the bottom of the tower body 11, and a nitrogen production outlet 121 is provided at the top of the tower top 12, the tower body 11 and the tower top 12 are enclosed to form an inner cavity of the tower body 1, and a nitrogen production molecular sieve 13 is provided in the inner cavity of the tower body 1.

[0037] The heat exchange tube 2 is coaxially sleeved outside the tower body 11, and the top inner wall and the bottom inner wall of the heat exchange tube 2 are both provided with inner flanges, and the circumferential inner wall of the inner flange is fixedly connected to the circumferential outer edge of the tower body 11, so that the heat exchange tube 2 is fixedly connected to the tower body 11, and a circular columnar heat exchange cavity is enclosed; the cooling inlet 21 is used to connect the coolant delivery component 3, so that the coolant can be delivered from the cooling inlet 21 to the heat exchange cavity through the coolant delivery component 3, and the coolant is discharged from the cooling outlet 22 after heat exchange in the cooling cavity.

[0038] The heat exchange tube 4 is arranged in the heat exchange cavity, and its two ends are respectively connected with an air inlet extension section 41 and an air outlet extension section 42. The air inlet extension section 41 and the air outlet extension section 42 are fixedly penetrated through the inner wall of the heat exchange tube 2, so that the heat exchange tube 4 is fixedly connected to the heat exchange tube 2, and the air outlet extension section 42 is connected to the nitrogen production inlet 111 through the air guide pipe 43.

[0039] When the device is used, the air compressor uses external air for compression processing to form compressed air, and the oil mist, moisture, particles and other impurities in the air are filtered out by the filter device to form clean compressed air, which is passed into the heat exchange tube 4 through the air inlet extension section 41. During the flow in the heat exchange tube 4, the coolant delivery component 3 delivers coolant to the heat exchange cavity, so that the coolant can absorb the heat of the compressed air through the tube wall of the heat exchange tube 4, and pre-cool the compressed air. After the compressed air is cooled, it passes through the air outlet extension section 42 and the air guide pipe 43, enters the tower body 11 from the nitrogen inlet 111, and contacts with the nitrogen molecular sieve 13. The nitrogen molecular sieve 13 absorbs oxygen in the compressed air to separate nitrogen, so that the nitrogen is discharged from the nitrogen outlet 121.

[0040] When the compressed air collides and contacts with the nitrogen-making molecular sieve 13, heat is generated, causing the temperature of the nitrogen-making molecular sieve 13 to rise, and the coolant in the heat exchange chamber can absorb the heat of the nitrogen-making molecular sieve 13 through the side wall of the tower body 11, thereby achieving a cooling effect on the nitrogen-making molecular sieve 13. In this way, the damage to the nitrogen-making molecular sieve 13 caused by high temperature and the shortening of the service life of the nitrogen-making molecular sieve 13 are avoided, the nitrogen-making purity and efficiency of the adsorption tower are guaranteed, and the failure rate is reduced; not only that, compared with the independent arrangement of the spiral cooling tube that occupies too much land area, in this embodiment, the heat exchange chamber is formed by enclosing the heat exchange tube 4 by the heat exchange cylinder 2 and the tower body 11, so as to pass the coolant to pre-cool the compressed air flowing in the heat exchange tube 4, which can greatly reduce the occupied area.

[0041] A further improvement is that the heat exchange tube 4 is spiral. After the heat exchange tube 4 adopts a spiral structure design, its length can be increased within the limited heat exchange cavity space, that is, the length of the compressed air flow path is increased, thereby extending the time for the compressed air to pass through the heat exchange tube 4, thereby increasing the compressed air heat absorbed by the coolant, and further improving the high pre-cooling effect on the compressed air.

[0042] A further improvement is that the nitrogen-generating molecular sieve 13 is located between the plane where the top and bottom of the heat exchange chamber are located. After adopting the above design, the heat exchange range of the heat exchange chamber is increased, so that the coolant in the heat exchange chamber can fully absorb the heat of the nitrogen-generating molecular sieve 13 through the side wall of the tower body 11, so as to increase the heat absorption and improve the cooling effect of the nitrogen-generating molecular sieve 13.

[0043] A further improvement is that the cooling inlet 21 and the cooling outlet 22 are respectively arranged at the bottom of the heat exchange tube 2 and the top of the heat exchange tube 2 .

[0044] Specifically, the cooling inlet 21 is arranged on the inner flange of the bottom of the heat exchange tube 2, and the cooling outlet 22 is arranged on the inner flange of the top of the heat exchange tube 2. Since the coolant enters the cooling cavity from the cooling inlet 21 and is discharged from the cooling outlet 22, the cooling cavity can be filled with coolant, and as the compressed air flows in the heat exchange tube 4, the lower the position of the coolant, the lower the temperature, and the more obvious the cooling effect. The air inlet extension section 41 is located on the upper side of the air outlet extension section 42, that is, when the compressed air passes through the heat exchange tube 4, it flows from high to low, and the temperature of the coolant exchanging heat with it is lower, which ensures that there is enough temperature difference between the compressed air and the coolant, thereby further ensuring the pre-cooling effect of the compressed air.

[0045] Second embodiment

[0046] like Figure 4 and Figure 5 As shown, the low failure rate adsorption tower for a single-making system according to the second embodiment of the utility model is based on the first embodiment, and the difference is that a heat dissipation fin 23 is provided on the circumferential outer edge of the heat exchange cylinder 2 .

[0047] Specifically, the heat dissipation fins 23 are distributed on the heat exchange tube 2 along the circumference of the heat exchange tube 2 . The heat dissipation fins 23 are long strips and extend along the vertical direction. The heat exchange tube 2 and adjacent heat dissipation fins 23 enclose a heat dissipation groove.

[0048] After adopting the above design, the cooling liquid absorbs the heat of the compressed air through the heat dissipation fins 23 and the temperature rises. Then the absorbed heat is transferred to the outside through the heat dissipation fins 23 to slow down the temperature rise rate of the cooling liquid, thereby ensuring the pre-cooling effect on the compressed air and the cooling effect on the nitrogen-making molecular sieve 13.

[0049] Third embodiment

[0050] like Figure 6-Figure 8 As shown, the low failure rate adsorption tower for the order making system of the third embodiment of the utility model is based on the second embodiment, and the difference lies in that a plurality of cooling outlets 22 are provided, which are distributed at the top of the heat exchange tube 2 along the circumference of the heat exchange tube 2; a baffle ring 24 is also provided at the top of the heat exchange tube 2, and the cooling outlet 22 and the tower body 1 are both provided on the inner side of the baffle ring 24; the coolant delivery assembly 3 includes a delivery pump 31 and a cooling pool 32, the input end of the delivery pump 31 is connected to the cooling pool 32, and the output end is connected to the cooling inlet 21, and the top of the cooling pool 32 is open to receive the coolant passing through the heat dissipation groove from top to bottom.

[0051] Specifically, the cooling outlets 22 are distributed in an annular array on the inner turn-down edge at the top of the heat exchange tube 2 along the circumference of the heat exchange tube 2; the baffle ring 24 is integrally formed on the inner turn-down edge at the top of the heat exchange tube 2 and protrudes upward.

[0052] After adopting the above structure, the cooling pool 32 can store coolant. When the device is in use, the coolant is transported upward to the heat exchange cavity through the delivery pump 31 until the heat exchange cavity is filled with coolant; the coolant can absorb the heat of the compressed air flowing in the heat exchange tube 4 and the heat of the nitrogen-making molecular sieve 13 inside the tower body 11, thereby achieving the pre-cooling effect of the compressed air and the cooling effect of the nitrogen-making molecular sieve 13.

[0053] The delivery pump 31 delivers coolant into the heat exchange cavity, so that the coolant with a higher temperature after absorbing heat is squeezed and replaced by the coolant from the cooling pool 32 below. After the coolant with a higher temperature flows out from the multiple cooling outlets 22 above the top of the heat exchange cylinder 2, the coolant continues to be introduced until the coolant level is flush with the top of the baffle ring 24. The coolant that absorbs heat at the top overflows from the top of the baffle ring 24, flows downward along the heat dissipation groove, and then falls into the cooling pool 32 and is pumped away by the delivery pump 31.

[0054] As the coolant flows downward along the heat dissipation groove, part of the coolant evaporates, taking away the heat from the coolant and the side wall of the heat exchange tube 2, causing the temperature of the coolant and the heat exchange tube 2 to decrease. In this way, the coolant returns to a low temperature when entering the cooling pool 32, ensuring that the delivery pump 31 can continuously deliver low-temperature coolant to the heat exchange cavity.

[0055] A further improvement is that the baffle ring 24 is fixed to the top of the heat exchange tube 2, and a top ring 25 is fixed above the baffle ring 24. The top ring 25 and the bottom ring are gap-fitted and a sponge ring 26 is arranged between the two. The circumferential outer edge of the sponge ring 26 is sealed with the circumferential inner wall of the bottom ring and is clamped between the heat exchange tube 2 and the top ring 25.

[0056] A connecting ring is also fixed to the bottom of the inner wall of the baffle ring 24, and the connecting ring is fixed to the inner turning edge at the top of the heat exchange tube 2. The cooling outlet 22 is located between the connecting ring and the sponge ring 26. The baffle ring 24, the connecting ring and the sponge ring 26 are all coaxial with the tower body 11. In this way, after adopting the above structure, the position of the sponge ring 26 can be fixed by using the cooperation between the baffle ring 24, the inner turning edge at the top of the tower body 11 and the top ring 25; the sponge ring 26 covers the gap between the top ring 25 and the baffle ring 24. The delivery pump 31 continuously delivers the coolant in the cooling pool 32 to the heat exchange chamber, so that after the coolant in the heat exchange chamber overflows, it can overflow outward in an orderly and slow manner through the sponge ring 26, so as to prevent the coolant from overflowing too quickly and spraying outward and being unable to pass through the heat dissipation groove; in this way, the sponge ring 26 blocks the outward overflow speed of the coolant, so that the coolant can flow downward through the heat dissipation groove, so as to cool down through its own contact with the outside world, and at the same time, the sponge ring 26 can prevent external impurities from entering through the gap between the top ring 25 and the baffle ring 24, entering the heat exchange chamber from the cooling outlet 22 or blocking the cooling outlet 22.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A low failure rate adsorption tower for a nitrogen production system, characterized in that: include: A tower body (1), wherein the tower body (1) is arranged in a vertical direction, a nitrogen production inlet (111) and a nitrogen production outlet (121) are respectively arranged at the bottom and the top of the tower body (1), and a nitrogen production molecular sieve (13) is arranged inside the tower body (1); A heat exchange cylinder (2), the heat exchange cylinder (2) being fixedly sleeved outside the tower body (1) and enclosing the tower body (1) to form a heat exchange cavity, the heat exchange cylinder (2) being provided with a cooling inlet (21) and a cooling outlet (22) which are in communication with the heat exchange cavity, the cooling inlet (21) being used to connect to a coolant delivery assembly (3); A heat exchange tube (4), wherein the heat exchange tube (4) is arranged in the heat exchange cavity and one end of the heat exchange tube is in communication with the nitrogen production inlet (111).

2. The low failure rate adsorption tower for a nitrogen production system according to claim 1, characterized in that: The heat exchange tube (4) is spiral-shaped.

3. The low failure rate adsorption tower for a nitrogen production system according to claim 1, characterized in that: The nitrogen-generating molecular sieve (13) is located between the plane where the top end of the heat exchange chamber is located and the plane where the bottom end is located.

4. The low failure rate adsorption tower for a nitrogen production system according to claim 1, characterized in that: The circumferential outer edge of the heat exchange cylinder (2) is provided with heat dissipation fins (23).

5. The low failure rate adsorption tower for a nitrogen production system according to claim 4, characterized in that: The cooling inlet (21) and the cooling outlet (22) are respectively arranged at the bottom of the heat exchange tube (2) and the top of the heat exchange tube (2).

6. The low failure rate adsorption tower for a nitrogen production system according to claim 5, characterized in that: The heat dissipation fins (23) are distributed on the heat exchange tube (2) along the circumference of the heat exchange tube (2); the heat exchange tube (2) and adjacent heat dissipation fins (23) are combined to form a heat dissipation groove; the coolant delivery component (3) comprises a delivery pump (31) and a cooling pool (32); the input end of the delivery pump (31) is connected to the cooling pool (32), and the output end is connected to the cooling inlet (21); the top of the cooling pool (32) is open to receive the coolant passing through the heat dissipation groove from top to bottom.

7. The low failure rate adsorption tower for a nitrogen production system according to claim 5, characterized in that: A plurality of cooling outlets (22) are provided, distributed at the top of the heat exchange tube (2) along the circumference of the heat exchange tube (2).

8. The low failure rate adsorption tower for a nitrogen production system according to claim 7, characterized in that: A baffle ring (24) is also provided at the top of the heat exchange cylinder (2), and the cooling outlet (22) and the tower body (1) are both arranged on the inner side of the baffle ring (24).

9. The low failure rate adsorption tower for a nitrogen production system according to claim 8, characterized in that: The baffle ring (24) is fixed to the top of the heat exchange cylinder (2), a top ring (25) is fixed above the baffle ring (24), the top ring (25) and the bottom ring are gap-matched, and a sponge ring (26) is provided between the two.

10. The low failure rate adsorption tower for a nitrogen production system according to claim 9, characterized in that: The circumferential outer edge of the sponge ring (26) is sealed against the circumferential inner wall of the bottom ring and is sandwiched between the heat exchange cylinder (2) and the top ring (25).

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