Tray and tower equipment

Abstract

The utility model relates to the field of chemical equipment, and discloses a tower tray and tower equipment, and the tower tray comprises a tower plate on which liquid is carried; a cavity is formed in the housing, the housing is arranged on the upper end face of the tower plate, a gap is formed between the housing and the upper end face of the tower plate, an opening communicated with the cavity is formed in the bottom wall of the housing, a through hole corresponding to the opening is formed in the tower plate, and the through hole is suitable for gas to pass through; and the separation plate is arranged in the cavity so as to be suitable for enabling a liquid film formed by the contact of the gas and the liquid to collide with the separation plate and enabling the liquid film to be broken to form liquid drops. According to the tower tray provided by the utility model, the separation plate is arranged in the housing, so that gas rising at a high speed enters the housing through the through holes and then is in contact with liquid to form a liquid film, and the liquid film collides with the separation plate under the action of gas flow and is broken to form liquid drops, so that the atomization effect of the liquid is improved; therefore, the gas phase and the liquid phase are fully contacted and mixed in the housing, and the mass transfer efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of chemical equipment, in particular to a tower tray and tower equipment. Background Art

[0002] Bubbling mass transfer refers to a mass transfer method in which the gas phase passes through the liquid layer on the plate to achieve gas-liquid contact, with the gas phase serving as the dispersed phase and the liquid phase serving as the continuous phase. In the chemical industry, sieve trays are commonly used to utilize this mass transfer mechanism, whereby gas bubbles through the liquid layer to achieve contact mass transfer. However, when gas passes through traditional sieve trays, the gas-liquid contact time and space are both short, resulting in poor liquid atomization and low mass transfer efficiency. Utility Model Content

[0003] In view of this, the utility model provides a tower tray and tower equipment to solve the problems of short gas-liquid contact time and space, poor liquid atomization effect and low mass transfer efficiency when gas passes through traditional sieve tower trays.

[0004] In a first aspect, the utility model provides a tower tray, comprising:

[0005] Trays, on which the liquid is carried;

[0006] The cover has a cavity inside, is arranged on the upper end surface of the tower plate, and forms a gap between the cover and the upper end surface of the tower plate. The bottom wall of the cover is provided with an opening communicating with the cavity, and the tower plate is provided with a through hole corresponding to the opening, and the through hole is suitable for gas to pass through;

[0007] The separation plate is arranged in the cavity so as to make the liquid film formed by the contact between the gas and the liquid collide with the separation plate and break the liquid film into liquid droplets.

[0008] Beneficial effect: By arranging a separation plate inside the cover, the high-speed rising gas enters the cover through the through hole and contacts the liquid to form a liquid film, and the liquid film collides with the separation plate under the action of the airflow and breaks into droplets, thereby improving the atomization effect of the liquid, so that the gas and liquid phases can fully contact and mix inside the cover, thereby improving the mass transfer efficiency.

[0009] In an optional embodiment, sieve holes are provided on the top wall and / or side walls of the housing, and the sieve holes are suitable for gas to pass through.

[0010] Beneficial effect: By opening sieve holes on the side wall of the cover, it allows gas to pass through while blocking the passage of liquid, so that the gas enters the upper tower plate, and the liquid drips back into the liquid layer on the original tower plate, which is beneficial to reduce liquid backmixing and upper liquid level gradient.

[0011] In an optional embodiment, the side walls of the cover are arranged at an angle to the direction of gravity, and the width of the cover gradually decreases from bottom to top.

[0012] Beneficial effect: By gradually reducing the width of the cover from bottom to top, the size of the cavity inside the cover is gradually reduced from bottom to top, so that the liquid film inside the cover is more likely to collide with the separation plate or the inner wall of the cover and break under the action of airflow.

[0013] In an optional embodiment, there are multiple cover shells, and the multiple cover shells are evenly spaced and distributed on the tower plate.

[0014] In an optional embodiment, the cover is provided with at least one separation plate, and the separation plate is extended along the direction of gravity.

[0015] Beneficial effect: By extending the separation plate along the direction of gravity, the resistance to gas is reduced.

[0016] In an optional embodiment, a cooling device is provided on the tower plate, and the cooling device is immersed in the liquid so as to be suitable for cooling the liquid.

[0017] Beneficial effect: By arranging a cooling device on the tower plate to cool the liquid on the tower plate, it is beneficial to remove the reaction heat in a timely and effective manner and improve the reaction effect.

[0018] In an optional embodiment, a local area of ​​the upper end surface of the tower plate is recessed to form a groove, and the heat exchanger is disposed in the groove.

[0019] Beneficial effect: By placing the cooling device in the groove, it is avoided that the liquid layer thickness on the tower plate is large in order to ensure that the liquid on the upper end surface of the tower plate can immerse the cooling device.

[0020] In an optional embodiment, a flow disturbing device is provided in the groove, and the flow disturbing device is suitable for disturbing the liquid on the tower plate.

[0021] Beneficial effect: By arranging a flow disturbance device on the tower plate, the liquid on the tower plate is disturbed, which is beneficial for the liquid on the tower plate to fully contact with the cooling device and improve the heat transfer effect.

[0022] In a second aspect, the present invention further provides a tower device, comprising:

[0023] tower body;

[0024] The tower tray is fixedly connected to the inner wall of the tower body. There are multiple tower trays, which are spaced apart in the direction of gravity.

[0025] In an optional embodiment, the tower equipment further includes a plurality of defoaming nets, and at least one layer of defoaming nets is provided above each tower tray.

[0026] Beneficial effect: By arranging a defoaming net above the tower plate, the entrainment of mist in the gas phase is reduced, and the collision process of the reaction gas in the gas phase in the defoaming net can effectively improve the mixing degree of the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a top view of the tower tray of the utility model;

[0029] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0030] Figure 3 It is a schematic diagram of the tower equipment of the utility model;

[0031] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0032] Figure 5 This is a schematic diagram of gas entering and exiting the cover body of the utility model.

[0033] Description of reference numerals:

[0034] 1. Tower plate; 101. Through hole; 2. Cover; 201. Sieve hole; 202. Cavity; 203. Opening; 3. Gap; 4. Separation plate; 5. Tower body; 6. Groove; 7. Defoaming net; 8. Support member; 9. Cooling device. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] The following combination Figures 1 to 5 , describing the embodiments of the present utility model.

[0040] According to an embodiment of the present invention, on the one hand, a tower tray is provided, comprising:

[0041] Tray 1, which carries liquid;

[0042] The housing 2 has a cavity 202 therein. The housing 2 is disposed above the tray 1 and defines a gap 3 with the upper end surface of the tray 1. The bottom wall of the housing 2 defines an opening 203 communicating with the cavity 202. The tray 1 defines a through hole 101 corresponding to the opening 203. The through hole 101 is adapted for passage of gas.

[0043] The separation plate 4 is disposed in the cavity 202 so as to allow the liquid film formed by the contact between the gas and the liquid to collide with the separation plate 4 and break the liquid film into liquid droplets.

[0044] The tower plate provided in this embodiment is provided with a separation plate 4 inside the cover shell 2, so that the high-speed rising gas enters the cover shell 2 through the through hole 101 and contacts with the liquid to form a liquid film, and the liquid film collides with the separation plate 4 under the action of the airflow and breaks into droplets, thereby improving the atomization effect of the liquid, so that the gas and liquid phases are fully contacted and mixed inside the cover shell 2, thereby improving the mass transfer efficiency.

[0045] Specifically, tray 1 carries a liquid for reacting with the gas. Taking the trays used in a nitric acid absorption tower as an example, tray 1 carries a liquid for reacting with nitric acid. In a preferred embodiment, the upper end surface of tray 1 is parallel to the horizontal. During gas-liquid contact, there are four sequential processes: liquid removal and film drawing, film rupture and pulverization, gas-liquid injection, and gas-liquid separation. Gas-liquid mass transfer occurs in each stage.

[0046] As the gas below tray 1 passes through through-hole 101, the reduced size of the gas passage converts pressure energy into kinetic energy, accelerating the gas. Because the gas velocity is high as it enters cavity 202 through through-hole 101 and opening 203, the static pressure of the liquid layer near opening 203 is low, creating a pressure differential between the inside and outside of casing 2. The liquid on tray 1 is forced into casing 2 through gap 3 at the bottom of casing 2 and opening 203. Upon contact with the rising, high-speed airflow, it changes direction, is lifted and pulled into an annular film, and then moves upward. During this process, the highly unstable liquid film is pulled by the high-speed airflow and impacts separation plate 4, breaking it into droplets of varying diameters. This improves the atomization of the liquid and facilitates sufficient contact and mixing of the gas and liquid phases within cavity 202.

[0047] As a feasible embodiment, a support member 8 is fixedly connected between the housing 2 and the tray 1. The tray 1 supports and fixes the housing 2 via the support member 8, so that a certain spacing exists between the bottom of the housing 2 and the upper end surface of the tray 1, thereby forming a gap 3. The support member 8 can be a support rod or a support plate. As an additional embodiment, the housing 2 is fixedly connected to the tray 1, and a through hole is opened in the bottom area of ​​the side wall of the housing 2. Liquid on the tray 1 is suitable for entering the interior of the housing 2 through the through hole, thereby forming the gap 3 through the through hole structure.

[0048] In some embodiments, combined Figures 1 to 5 As shown, sieve holes 201 are provided on the top wall and / or side walls of the housing 2 , and the sieve holes 201 are suitable for gas to pass through.

[0049] The tower tray provided in this embodiment has sieve holes 201 on the top wall and / or side wall of the cover 2, which allows gas to pass through while blocking the passage of liquid. This allows gas to enter the upper tower tray 1, while the liquid drips back into the liquid layer on the original tower tray 1, which is beneficial to reducing liquid backmixing and upper liquid level gradient.

[0050] Specifically, the gas and liquid phases contact and mix within the housing 2 and are then vertically ejected through the sieve holes 201, causing the gas and liquid to separate. The gas is ejected through the sieve holes 201 and rises into the upper tray 1, while the liquid droplets fall back into the liquid layer of the original tray 1. Preferably, a plurality of sieve holes 201 are formed on the sidewall of the housing 2, and the plurality of sieve holes 201 are evenly spaced on the sidewall of the housing 2.

[0051] In some embodiments, combined Figures 1 to 5 As shown, the side walls of the housing 2 are arranged at an angle to the direction of gravity, and the width of the housing 2 gradually decreases from bottom to top.

[0052] The tower tray provided in this embodiment gradually reduces the width of the cover shell 2 from bottom to top, so that the size of the internal cavity 202 of the cover shell 2 gradually decreases from bottom to top, thereby making it easier for the liquid film inside the cover shell 2 to collide with the separation plate 4 or the inner wall of the cover shell 2 and break under the action of the airflow.

[0053] Specifically, the side walls of the cover 2 are inclined from bottom to top in a direction gradually approaching each other, so that the space of the cavity 202 gradually shrinks from bottom to top, thereby compressing the activity space of the liquid film, making it easier to collide with the separation plate 4 or the inner wall of the cover 2 and break into droplets of different diameters.

[0054] In some embodiments, combined Figures 1 to 5 As shown, there are multiple covers 2 , which are evenly spaced and distributed on the tray 1 .

[0055] Specifically, multiple covers 2 are distributed at equal intervals on the tray 1 , which is beneficial to improving the uniformity and stability of the gas below the tray 1 rising to the upper tray 1 through the tray 1 and the liquid layer thereon.

[0056] In some embodiments, combined Figures 1 to 5 As shown, the housing 2 is provided with at least one separation plate 4, and the separation plate 4 is extended along the direction of gravity.

[0057] The tower tray provided in this embodiment reduces the resistance to gas by extending the separation plate 4 along the direction of gravity.

[0058] Specifically, the plane where the separation plate 4 is located is parallel to the direction of gravity, which is beneficial to reducing the resistance of the gas in the process of entering the housing 2 and spraying out of the housing 2, thereby reducing the resistance of the tower plate to the gas.

[0059] In some embodiments, combined Figures 1 to 5 As shown, a cooling device 9 is provided on the tower plate 1 and is immersed in the liquid so as to cool the liquid.

[0060] The tower tray provided in this embodiment is provided with a cooling device 9 on the tower plate 1 to cool the liquid on the tower plate 1, which is beneficial for timely and effective removal of reaction heat and improving the reaction effect.

[0061] Specifically, there is at least one cooling device 9. As a feasible embodiment, the cooling device 9 is a plate heat exchanger, which is disposed on the tower tray 1 and immersed in the liquid layer on the tower tray 1 to ensure the cooling effect of the cooling device 9. As an alternative embodiment, the cooling device 9 is a cooling pipe with coolant flowing therein, and at least a portion of the cooling pipe is immersed in the liquid layer on the tower tray 1.

[0062] In some embodiments, combined Figures 1 to 5 As shown, a local area of ​​the upper end surface of the tower plate 1 is recessed to form a groove 6, and the heat exchanger is arranged in the groove 6.

[0063] The tower tray provided in this embodiment places the cooling device 9 in the groove 6 to avoid a thicker liquid layer on the tower tray 1 in order to ensure that the liquid on the upper end surface of the tower tray 1 can immerse the cooling device 9.

[0064] Specifically, the position of the groove 6 avoids the position of the cover 2, and the cooling device 9 is placed in the groove 6. Preferably, after the cooling device 9 is placed in the groove 6, the upper end surface of the cooling device 9 is flush with the upper end surface of the tower plate 1, or lower than the upper end surface of the tower plate 1, thereby avoiding the liquid immersion of the cooling device 9, thereby avoiding affecting the thickness of the liquid layer on the upper end surface of the tower plate 1. This is conducive to avoiding the related art that, in order to ensure the cooling effect, the cooling device 9 is immersed in the liquid layer, thereby increasing the thickness of the liquid layer on the tower plate 1, resulting in a very large overall pressure drop in the absorption tower, which in turn affects the absorption pressure of the entire tower and reduces the absorption effect; on the other hand, it causes the compression ratio of the compressor to increase and the energy consumption of the compressor to increase.

[0065] In some embodiments, combined Figures 1 to 5 As shown, a flow disturbing device is provided in the groove 6 , and the flow disturbing device is suitable for disturbing the liquid on the tower plate 1 .

[0066] The tower tray provided in this embodiment is provided with a turbulent device on the tower plate 1 to disturb the liquid on the tower plate 1, which is beneficial for the liquid on the tower plate 1 to fully contact with the cooling device 9 and improve the heat transfer effect.

[0067] Specifically, the turbulence device includes a driving motor and a stirring member fixedly connected to the output shaft of the driving motor, wherein at least part of the stirring member is immersed in the liquid on the tower plate 1, wherein the stirring member includes a stirring blade and a stirring rod, and the driving motor includes an electric motor, a hydraulic motor, and a pneumatic motor. The output shaft of the driving motor rotates around its own axis and drives the stirring member to rotate, thereby driving the liquid on the tower plate 1 to be disturbed, which is conducive to ensuring full contact between the liquid and the cooling device 9, improving the heat transfer effect of the heat extraction area, ensuring the oxidation and absorption effect, and improving NO xThis helps to avoid the problem in related art where, due to the large amount of liquid held on tray 1 and the small amount of fresh desalted water arriving from the top of the absorption tower, the liquid flows very slowly on tray 1, forming a flow pattern similar to horizontal flow. This results in poor cooling efficiency of cooling device 9, making it impossible to effectively remove the reaction heat in the tower in a timely manner, resulting in reduced NO oxidation and NO2 absorption efficiency. As a feasible implementation, the flow disturbance device is disposed in groove 6.

[0068] Furthermore, the cooling device 9 is fixedly connected in the groove 6 to prevent the cooling device 9 from floating out of the liquid layer and / or colliding with other structures under the action of liquid disturbance when the liquid is disturbed. The fixed connection forms include bolt connection, pin connection, and binding.

[0069] According to an embodiment of the present invention, on the other hand, a tower device is provided, comprising:

[0070] Tower 5;

[0071] The tower tray is fixedly connected to the inner wall of the tower body 5. There are multiple tower trays, which are spaced apart in the direction of gravity.

[0072] Specifically, the tower body 5 has an accommodating space inside, and multiple tower plates are arranged in the accommodating space at intervals in the direction of gravity. The tower plates are fixedly connected to the inner wall of the tower body 5. The multiple tower plates can be arranged at equal intervals or at variable intervals according to actual needs.

[0073] In some embodiments, combined Figures 1 to 5 As shown, the tower equipment further includes a plurality of defoaming nets 7, and at least one layer of defoaming nets 7 is provided above each tower tray.

[0074] The tower equipment provided in this embodiment reduces the entrainment of mist in the gas phase by arranging a defoaming net 7 above the tower plate 1, and the collision process of the reaction gas in the gas phase in the defoaming net 7 can effectively improve the mixing degree of the gas.

[0075] Specifically, in the related technology, taking the nitric acid absorption tower as an example, as the gas volume increases, the sieve tray is prone to cause mist entrainment. The nitric acid absorption tower uses a very small amount of desalted water, which is a very typical atmospheric-liquid ratio working condition. A small amount of entrainment will have a fatal impact on the absorption effect. On the other hand, a humid environment is not conducive to NO x The present embodiment provides a plurality of defoaming nets 7 to effectively reduce the entrainment of mist in the gas phase and improve the mixing degree of the gas, thereby increasing the oxidation depth of nitrogen oxides.

[0076] Obviously, the above embodiments are merely examples for the purpose of clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. A tower tray, characterized in that: include: a tray (1) carrying a liquid thereon; A cover (2) having a cavity (202) therein; the cover (2) is arranged above the tray (1) and forms a gap (3) between the cover and the upper end surface of the tray (1); an opening (203) communicating with the cavity (202) is formed on the bottom wall of the cover (2); and a through hole (101) is formed on the tray (1) corresponding to the opening (203); the through hole (101) is suitable for gas to pass through; A separation plate (4) is arranged in the cavity (202) so as to allow a liquid film formed by contact between the gas and the liquid to collide with the separation plate (4) and break the liquid film into liquid droplets.

2. The tray according to claim 1, wherein The top wall and / or side wall of the housing (2) are provided with sieve holes (201), and the sieve holes (201) are suitable for gas to pass through.

3. The tower tray according to claim 1, characterized in that The side wall of the cover shell (2) is arranged at an angle to the direction of gravity, and the width of the cover shell (2) gradually decreases from bottom to top.

4. The tower tray according to claim 1, wherein There are multiple covers (2), and the multiple covers (2) are distributed at equal intervals on the tower plate (1).

5. The tray according to claim 1, wherein At least one separation plate (4) is provided in the housing (2), and the separation plate (4) is extended along the direction of gravity.

6. The tray according to claim 1, wherein A cooling device (9) is provided on the tower plate (1), and the cooling device (9) is immersed in the liquid so as to be suitable for cooling the liquid.

7. The tray according to claim 6, characterized in that A local area of ​​the upper end surface of the tower plate (1) is recessed to form a groove (6), and the cooling device (9) is arranged in the groove (6).

8. The tray according to claim 7, characterized in that A flow disturbing device is provided in the groove (6), and the flow disturbing device is suitable for disturbing the liquid on the tower plate (1).

9. A tower device, characterized in that: include: Tower body(5); The tower tray according to any one of claims 1 to 8 is fixedly connected to the inner wall of the tower body (5), and the number of the tower trays includes multiple, and the multiple tower trays are spaced apart in the direction of gravity.

10. The tower apparatus according to claim 9, characterized in that The tower equipment further comprises a plurality of defoaming nets (7), and at least one layer of the defoaming nets (7) is arranged above each of the tower plates.

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