Improved mass transfer tray

Abstract

The utility model provides an improved mass transfer tower tray, which comprises a tower plate, the tower plate is provided with a cover hood, and the lower part of the cover hood is provided with a plurality of sieve pores on the tower plate; the cap cover comprises a cap cover body, a top plate is arranged on the upper portion of the cap cover body and connected with the top of the cap cover body, side plates are arranged on the two sides of the top plate, first air holes are formed in the side plates, and a plurality of top screen holes are formed in the top plate. The top sieve holes are formed, so that the impact force borne by the top plate can be relieved, and the device is suitable for occasions with large liquid amount; the screen holes are provided with fixed valves, gas moves towards the tail ends of the fixed valve plates from the valves, and a downward secondary film-drawing crushing mass transfer effect is achieved, so that the gas-liquid contact area is increased, gas-liquid contact is sufficient, and mass transfer is more uniform; the kinetic energy factor of gas coming out from the side surfaces of the gaps between the fixed valve plates and the top sieve pores and the gaps between the fixed valve legs and the top sieve pores is reduced, so that the pressure is reduced by 15-20% compared with that of a traditional float valve tray; after the gas is discharged from the tower plate, the vertical momentum is converted into the transverse momentum, so that the entrainment is smaller.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and in particular to an improved mass transfer tower tray. Background Art

[0002] Tower equipment is an important unit operation equipment in chemical, oil refining, food, medicine and environmental protection sectors. Tower equipment enables the gas phase and liquid phase to fully contact to achieve the purpose of mass transfer and heat transfer between the phases. For plate towers, the core component to achieve this purpose is the tower plate. The tower plate is the main gas-liquid and liquid-liquid contact unit. The performance of the tower plate not only affects the performance and quality of the product, but also affects the economic benefits, energy consumption, output value and the environment.

[0003] In the production process of chemical industry, oil refining, air separation, etc., there are high operating pressure, large liquid volume and small gas volume. Especially in the distillation separation process of ethane, propane and butane, the gas phase density is relatively large, generally reaching 20-40kg / m 3 In this case, it is easy to cause tower plate deviation, gas-liquid backmixing, liquid-gas backmixing, affecting the mass transfer and heat transfer effects, and thus affecting normal production.

[0004] The existing unit structures of tray mass transfer mainly include: sieve tray, bubble tray, float valve tray and various flow trays, each of which has its own applicable fields; the sieve tray has a simple structure, but has low operational flexibility, and has low mass transfer efficiency for processes with a large liquid-gas ratio; the bubble tray has high operational flexibility, and the tray is not easy to be blocked, but has a complex structure, high cost, low production capacity and plate efficiency, and because the tooth gap opening is fixed, the adaptability to changes in steam load is poor, and when the gas velocity is low, the gas-liquid contact is poor, and when the gas velocity is high, it is easy for steam to blow away the liquid; the float valve tray has greater operational flexibility, can better adapt to changes in feed volume, has better gas-liquid agitation, less mist entrainment, long contact time, and good mass transfer effect, but the steam is ejected along the periphery of the rising steam pore, and there is still reverse mixing of the liquid, which will reduce the mass transfer efficiency. In addition, the valve plate is easily stuck, rusted or stuck, affecting the opening, and is not suitable for systems with high viscosity and easy clogging.

[0005] Under the working condition of particularly large liquid volume, many solutions have been proposed for the form of liquid descent, including traditional multi-overflow trays, DJ trays, MD trays, UTRAFRAC multi-downfall, TST trays and other forms of internals, but there is still room for improvement in the optimization combination of mass transfer mode and downfall system; in view of the shortcomings of various existing trays, domestic and foreign manufacturers in this field have designed many new, high-efficiency, flexible and other new trays that are beneficial to industrial production on the basis of retaining the advantages of the original traditional trays in recent years, which are used to transform the trays used on the original equipment. For example, in a new mass transfer tray in Chinese patent application number: CN202223001054.9, a technical solution is disclosed, including trays, A plurality of caps are evenly arranged on the tower plate, and a plurality of sieve holes are evenly arranged on the lower part of the caps; the upper liquid of the utility model descends to the tower plate, and the gas phase rises from the bottom of the tower plate, and bubbles with the liquid flowing on the tower plate through the caps, so as to realize gas-liquid contact mass transfer; a plurality of sieve holes are evenly arranged on the lower part of the cap of the application, and the gas phase rises from the bottom of the tower plate through the sieve holes, and bubbles with the liquid on the tower plate, and the gas-liquid mass transfer is enhanced by the setting of the sieve holes, and the gas-liquid separation is ensured, which is particularly suitable for high pressure and large liquid-gas ratio occasions; and the cap and the tower plate can be connected by bolts, which is quick to disassemble and easy to maintain; however, in this application, for occasions with large liquid volume, the impact on the top of the cap is large, and leakage may occur.

[0006] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0007] The present application provides an improved mass transfer tower plate, comprising a tower plate, on which a plurality of caps are evenly arranged, and a plurality of sieve holes are evenly arranged on the tower plate at the lower part of the caps; the caps comprise a cap body, on the upper part of the cap body a top plate is arranged, the top plate is connected to the top of the cap body, side plates perpendicular to the top plate are arranged on both sides of the top plate, air holes are opened on the side plates, and a plurality of top sieve holes are opened on the top plate.

[0008] As a preferred solution, a fixed valve is provided on the top plate at a position corresponding to the top sieve hole.

[0009] As a preferred solution, the fixed valve includes a fixed mounting portion, at least two fixed valve plates are arranged on the outer side of the fixed mounting portion, fixed valve legs are arranged between adjacent fixed valve plates or on the side of the fixed valve plates facing away from the fixed mounting portion, the fixed valve legs are connected to the top plate, the number of fixed valve legs is less than or equal to the number of fixed valve plates, and gaps are arranged between the fixed valve plates and the top sieve holes, and between the fixed valve legs and the top sieve holes.

[0010] As a preferred solution, the fixed mounting portion is in the shape of an arc, a circle, a triangle, a rhombus, a rectangle, an ellipse, a clover leaf, or a runway, or the projection shape of the fixed mounting portion on the top plate is in the shape of an arc, a circle, a triangle, a rhombus, a rectangle, an ellipse, a clover leaf, or a runway.

[0011] As a preferred embodiment, the fixed valve plate is in any one of an arc shape, a circle, a semicircle, a clover shape, a triangle, a rhombus shape, a rectangle, an ellipse shape, and a tongue shape, or the projection shape of the fixed valve plate on the top plate is in any one of an arc shape, a circle, a semicircle, a clover shape, a triangle, a rhombus shape, a rectangle, an ellipse shape, and a tongue shape.

[0012] As a preferred solution, the fixed valve leg is tilted, and the angle between the fixed valve leg and the top plate is 20°-80°.

[0013] As a preferred solution, the fixed valve plates are evenly arranged on the outside of the fixed mounting portion.

[0014] As a preferred solution, the area of ​​the top sieve hole is larger than the projection area of ​​the fixed valve on the top plate.

[0015] As a preferred solution, the fixed valve and the tower plate are integrally formed.

[0016] As a preferred solution, the fixed valve as a whole is in the shape of an arc with a middle portion convex upward.

[0017] As a preferred solution, serrations are provided on the edge of the fixed valve plate.

[0018] As a preferred solution, the cap cover body includes symmetrically arranged mounting plates 1 and 2, symmetrically arranged mounting plates 3 and 4 between the mounting plates 1 and 2, and air holes 2 are provided on the mounting plates 1 and 2; the heights of the mounting plates 1 and 2 are smaller than those of the mounting plates 3 and 4, and air intake channels are formed between the mounting plates 1 and 3, and 4, and between the mounting plates 2 and 3, and 4; the side plates are respectively arranged on one side of the mounting plates 1 and 2.

[0019] As a preferred solution, a downcomer is provided between two adjacent caps, and the downcomer passes through the tower plate. The upper part of the tower plate is an upper downcomer, and the lower part of the tower plate is a descending liquid pipe. The height of the upper downcomer is equal to the height of the caps. A liquid inlet is provided on the upper downcomer, and a liquid flow hole is provided on the bottom plate of the downcomer.

[0020] As a preferred solution, the mounting plate 1 and the mounting plate 2 are rectangular, the mounting plate 3 and the mounting plate 4 are trapezoidal, and the trapezoidal upper bottoms of the mounting plate 3 and the mounting plate 4 are connected to the top plate.

[0021] As a preferred solution, a connecting plate is provided at the bottom of the mounting plate three and the mounting plate four, and the connecting plate is connected to the tower plate by bolts.

[0022] As a preferred solution, the connecting plate is connected to the tower plate by welding.

[0023] As a preferred solution, the downcomer comprises a body, the top of the body is connected to a sealing plate, the bottom of the body is connected to a bottom plate, the bottom plate is provided with liquid flow holes; and the body is provided with a liquid inlet.

[0024] As a preferred solution, the main body is a hollow cuboid, which includes connecting plate 1, connecting plate 2, connecting plate 3, and connecting plate 4 connected in sequence, and connecting plate 1, connecting plate 2, connecting plate 3, and connecting plate 4 are all provided with liquid inlets.

[0025] As a preferred solution, the main body is a hollow cylinder, and a liquid inlet is provided on the outer wall of the cylinder.

[0026] As a preferred solution, a third air hole is provided on one side of the cap cover adjacent to the downcomer, and the height of the third air hole is higher than the height of the liquid inlet.

[0027] The upper liquid of the present invention descends to the tower plate, and the gas phase rises from the bottom of the tower plate and bubbles with the liquid flowing on the tower plate through the cap, so as to realize gas-liquid contact mass transfer; the lower part of the cap of the present invention is evenly provided with a plurality of sieve holes on the tower plate, and the gas phase rises from the bottom of the tower plate through the sieve holes and bubbles with the liquid on the tower plate. The setting of the sieve holes strengthens the gas-liquid mass transfer and ensures the gas-liquid separation, which is particularly suitable for high pressure and large liquid-gas ratio occasions; the setting of the top sieve holes can alleviate the impact force borne by the top plate, and is thus suitable for large liquid volume occasions. occasions, and no leakage will occur; preferably, a fixed valve is arranged on the sieve hole, and the gas moves from the valve to the end of the fixed valve plate, which has a downward secondary film-pulling and breaking mass transfer effect, thereby increasing the gas-liquid contact area, ensuring sufficient gas-liquid contact, and making the mass transfer more uniform; the kinetic energy factor of the gas coming out from the gap between the fixed valve plate and the top sieve hole and the gap between the fixed valve leg and the top sieve hole is reduced, so the pressure drop is 15-20% lower than that of the traditional floating valve tower plate; after the gas leaves the tower plate, the vertical momentum is converted into lateral momentum, so the mist entrainment is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of the first angle of the present application;

[0029] Figure 2 This is a structural diagram of the second angle of the present application;

[0030] Figure 3 This is a schematic structural diagram of the cap cover of the present application at angle 1;

[0031] Figure 4 This is a schematic structural diagram of the cap cover of the present application at angle 2;

[0032] Figure 5 This is a schematic structural diagram of the cap cover of the present application at angle 3;

[0033] Figure 6 This is a schematic diagram of the structure of the valve hole of the second embodiment of the utility model;

[0034] Figure 7 This is a structural schematic diagram of a fixed valve in Embodiment 2 of the present utility model;

[0035] Figure 8 This is a schematic diagram of the structure of the valve hole of the third embodiment of the utility model;

[0036] Fig. 9 This is a schematic structural diagram of a fixed valve in Embodiment 3 of the present utility model;

[0037] Fig.10 This is a schematic structural diagram of a fixed valve in Embodiment 4 of the present utility model;

[0038] Fig.11 Another structural schematic diagram of the fixed valve of the fourth embodiment of the utility model;

[0039] Fig.12 It is a structural schematic diagram of a fixed valve in Embodiment 5 of the present utility model;

[0040] Fig.13 It is a schematic diagram of the structure of the downcomer of the present application;

[0041] Fig.14 is a schematic diagram of another structure of the downcomer of the present application;

[0042] 1. Tower plate; 2. Cap cover; 3. Bolts; 4. Sieve hole; 5. Cap cover body; 6. Top plate; 7. Side plate; 8. Air hole one; 9. Top sieve hole; 10. Mounting plate one; 11. Mounting plate three; 12. Air hole two; 13. Air inlet channel; 14. Connecting plate; 15. Fixed valve; 16. Fixed mounting part; 17. Fixed valve plate; 18. Fixed valve leg; 19. Gap; 20. Sawtooth; 21. Downcomer; 22. Upper downcomer; 23. Downcomer; 24. Liquid inlet; 25. Bottom plate; 26. Liquid flow hole; 27. Body; 28. Sealing plate; 29. ​​Air hole three; 30. Overflow hole; 31. Flip plate; 32. Flip plate serration. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1 — Fig.14The specific implementation of the utility model is described in detail. It should be noted that the specific implementation described here is only used to illustrate and explain the utility model, and is not used to limit the utility model.

[0044] Embodiment 1:

[0045] The present embodiment provides an improved mass transfer tower plate, including a tower plate 1. The tower plate 1 can be a tower plate in the prior art. The present invention does not make any improvements thereto and will not be described in detail herein. A plurality of caps 2 are evenly arranged on the tower plate 1. The caps 2 and the tower plate 1 can be connected by welding or the like, or by a detachable connection, such as screws, bolts 3, etc. The detachable connection facilitates quick disassembly and convenient maintenance. A plurality of sieve holes 4 are evenly arranged on the tower plate 1 at the lower part of the cap 2. The sieve holes 4 are in the shape of square, circular, elliptical, clover, etc. The gas-liquid mass transfer effect can be improved by using a plurality of evenly arranged sieve holes 4, thereby improving the gas-liquid mass transfer efficiency. The cap 2 includes a cap body 5. A top plate 6 is arranged on the upper part of the cap body 5. The top plate 6 is connected to the top of the cap body 5. It is sealed and fixed by bonding, welding and other methods in the prior art; side panels 7 perpendicular to it are provided on both sides of the top plate 6, and an air hole 8 is opened on the side panel 7, and the air hole 8 can be in any shape such as round, square, keyway, irregular, etc., and the gas is ejected from the air hole 8; the two side panels 7 and the top plate 6 are "U"-shaped, and the side panels 7 and the top plate 6 can be formed in an integral molding manner, or can be sealed and fixed by bonding, welding and other methods. The arrangement of the top plate 6 and the side panels 7 can effectively suppress the entrainment of mist and foam; a plurality of top sieve holes 9 are evenly opened on the top plate 6, and the top sieve holes 9 are in any shape such as square, round, elliptical, clover-shaped, keyway-shaped, irregular, etc.; the arrangement of the top sieve holes 9 can relieve the impact force borne by the top plate 6, and is suitable for occasions with large liquid volume, and will not cause leakage.

[0046] Preferably, the cap cover body 5 includes a symmetrically arranged mounting plate 10 and a mounting plate 2, a mounting plate 3 11 and a mounting plate 4 are symmetrically arranged between the mounting plate 10 and the mounting plate 2, the mounting plate 10 and the mounting plate 2 are of equal size, and the mounting plate 3 11 and the mounting plate 4 are of equal size; the mounting plate 10, the mounting plate 2, the mounting plate 3 11, and the mounting plate 4 are sealed and formed by bonding, welding, integral molding, etc., and the mounting plate 10 and the mounting plate 2 are provided with a pore 2 12, and the pore 2 12 can be in any shape such as round, square, keyway, irregular, etc. The shape is arbitrary, and the gas is ejected from the air hole 2 12; the height of the mounting plate 10 and the mounting plate 2 is smaller than the height of the mounting plate 3 11 and the mounting plate 4, and an air inlet channel 13 is formed between the mounting plate 10 and the mounting plate 3 11 and the mounting plate 4, and between the mounting plate 2 and the mounting plate 3 11 and the mounting plate 4, and the gas enters the upper part of the tower plate 1 from the air inlet channel 13 to contact the liquid; the side plates 7 are respectively arranged on one side of the mounting plate 10 and the mounting plate 2; more preferably, the sieve hole 9 is arranged on the top plate 6 between the mounting plate 10, the mounting plate 2, the mounting plate 3 11 and the mounting plate 4.

[0047] Preferably, a connecting plate 14 is provided at the bottom of the mounting plate three 11 and the mounting plate four, and the connecting plate 14 is connected to the tower plate 1 by bolts 3, which is convenient for disassembly and maintenance; however, the connection is not limited to the bolt 3, and welding and other methods can also be used for connection. The technicians can choose according to the specific situation.

[0048] More preferably, in order to make the gas-liquid contact more uniform and the mass transfer effect better; the mounting plate 1 10 and the mounting plate 2 are rectangular, the mounting plate 3 11 and the mounting plate 4 are trapezoidal, and the trapezoidal upper bottoms of the mounting plate 3 11 and the mounting plate 4 are sealed and connected to the top plate 6; more preferably, the mounting plate 1 10, the mounting plate 2, the mounting plate 3 11, the mounting plate 4, the top plate 6, and the side plate 7 are integrally formed.

[0049] Embodiment 2:

[0050] In order to increase the gas-liquid contact area and make the mass transfer more uniform, and reduce the entrainment of mist, this embodiment specifically:

[0051] The top plate 6 is provided with a fixed valve 15 at a position corresponding to the top sieve hole 9. The shape of the top sieve hole 9 is the same as the projection shape of the fixed valve 15 on the top plate 6, and the area of ​​the top sieve hole 9 is larger than the projection area of ​​the fixed valve 15 on the top plate 6. Preferably, the area of ​​the top sieve hole 9 is equal to 1.2-1.9 times the projection area of ​​the fixed valve 15 on the top plate 6. Preferably, in order to facilitate processing, ensure that the fixed valve 15 is arranged evenly and tightly, make full use of space, increase the opening rate, and increase the processing volume, the fixed valve 15 is arranged together with the top plate 6. The fixed valve 15 is formed by stamping on the tower plate 1; the fixed valve 15 includes a fixed installation portion 16, and the fixed installation portion 16 is in any one of an arc shape, a circle, a triangle, a rhombus shape, a rectangle, an ellipse, a clover shape, and a runway shape, or the projection shape of the fixed installation portion 16 on the top plate 6 is in any one of an arc shape, a circle, a triangle, a rhombus shape, a rectangle, an ellipse, a clover shape, and a runway shape; the technicians can select according to the specific situation. In this embodiment, a circle is taken as an example, and the outer side of the fixed installation portion 16 At least two fixed valve discs 17 are provided. Preferably, the fixed valve discs 17 are evenly arranged on the outer side of the fixed mounting portion 16 and are integrally formed. The fixed valve disc 17 is in any one of an arc shape, a circle, a semicircle, a clover shape, a triangle, a rhombus shape, a rectangle, an ellipse, and a tongue shape, or the projection shape of the fixed valve disc 17 on the top plate 6 is in any one of an arc shape, a circle, a semicircle, a clover shape, a triangle, a rhombus shape, a rectangle, an ellipse, and a tongue shape, and is selected according to the specific situation. That is; a fixed valve leg 18 is provided between adjacent fixed valve plates 17 or on one side of the fixed valve plate 17. In this embodiment, the fixed valve leg 18 is provided between adjacent fixed valve plates 17, the fixed valve leg 18 is connected to the top plate 6, the fixed valve leg 18 is inclined, the angle between the fixed valve leg 18 and the tower plate 1 is 20°-80°, the number of the fixed valve legs 18 is less than or equal to the number of the fixed valve plates 17, and a gap 19 is provided between the fixed valve plate 17 and the top sieve hole 9, and between the fixed valve leg 18 and the top sieve hole 9.

[0052] In this embodiment, Figure 5 , Figure 7 As shown, the fixed valve disc 17 is made of three pieces, and the three fixed valve discs 17 are evenly arranged, that is, the angle between adjacent fixed valve discs 17 is 120°, the fixed valve disc 17 is in an arc shape, and there is a concave arc between adjacent fixed valve discs 17, and the fixed valve legs 18 are three, and the three fixed valve legs 18 are respectively arranged on the concave arcs between adjacent fixed valve discs 17. Preferably, the radius of the arc of the fixed valve disc 17 is equal to the radius of the concave arc; in this embodiment, the fixed valve disc 17 is in an arc shape with a convex middle part upward; more preferably, in order to improve the gas-liquid contact condition on the upper surface of the fixed valve disc 17, the edge of the fixed valve disc 17 is provided with saw teeth 20; Figure 6The shape of the top sieve hole 9 corresponding to the fixed valve of this embodiment is shown in FIG.

[0053] Embodiment three:

[0054] The difference between this embodiment and the second embodiment lies in the installation position of the fixed valve leg 18 and the shape of the fixed valve plate 17. Specifically:

[0055] Fig. 9 As shown, the fixed valve installation part 16 is circular, and three fixed valve plates 17 are arranged on the outer side of the fixed installation part 16. The fixed valve plates 17 are tongue-shaped.

[0056] The three fixed valve discs 17 are evenly arranged, that is, the angle between adjacent fixed valve discs 17 is 120°, a fixed valve leg 18 is arranged on one side of the fixed valve disc 17, and the fixed valve leg 18 is connected to the top plate 6. In this embodiment, three fixed valve legs 18 are arranged, which are respectively arranged on the outsides of the three fixed valve discs 17. The fixed valve legs 18 are inclined, and the angle between the fixed valve legs 18 and the top plate 6 is 20°-80°. The number of fixed valve legs 18 is less than or equal to the number of fixed valve discs 17. In this embodiment, the number of fixed valve legs 18 is equal to the number of fixed valve discs 17. Gaps 19 are arranged between the fixed valve disc 17 and the top sieve hole 9, and between the fixed valve legs 18 and the top sieve hole 9; Figure 8 The shape of the top sieve hole 9 corresponding to the fixed valve 15 of this embodiment is shown in FIG.

[0057] More preferably, in order to improve the gas-liquid contact condition on the upper surface of the fixed valve plate 17 , serrations 20 are provided at the edge of the fixed valve plate 17 .

[0058] Embodiment 4:

[0059] The difference between this embodiment and the second embodiment lies in the shape of the fixed installation portion 16, the number of fixed valve plates 17, and the number of fixed valve legs 18. Specifically:

[0060] like Fig.10 As shown, the fixed valve installation part 16 is rectangular or its projection area is rectangular, and 12 fixed valve plates 17 are arranged on the outside of the fixed installation part 16, wherein four fixed valve plates 17 are arranged on the two long sides of the rectangle, and the four groups of fixed valve plates 17 on the long sides are symmetrical about the central planes of the two groups of long sides of the rectangle, and two fixed valve plates 17 are arranged on the two short sides of the rectangle, and the two groups of fixed valve plates 17 are symmetrical about the central planes of the short sides of the rectangle, and the fixed valve plates 17 are semicircular, and fixed valve legs 18 are arranged between adjacent fixed valve plates 17, and the fixed valve legs 18 are connected to the tower plate 1. In this embodiment, two fixed valve legs 18 are arranged, and the two fixed valve legs 18 are symmetrical about the central planes of the two short sides of the rectangle. The number of fixed valve legs 18 can be adjusted according to specific circumstances, such as Fig.11As shown, six fixed valve legs 18 are provided, and the six fixed valve legs 18 are symmetrical about the central planes of the two long sides of the rectangle. The fixed valve legs 18 in this embodiment can be provided on the outside of the fixed valve plate 17. The number of the fixed valve legs 18 can be set according to the specific situation and will not be described in detail here. Gaps 19 are provided between the fixed valve plate 17 and the top sieve hole 9, and between the fixed valve legs 18 and the top sieve hole 9.

[0061] More preferably, in order to improve the gas-liquid contact condition on the upper surface of the fixed valve plate 17, the edge of the fixed valve plate 17 is provided with saw teeth 20 ( Fig.10 , Fig.11 not shown).

[0062] Embodiment five:

[0063] The difference between this embodiment and the second embodiment lies in the shape of the fixed installation portion 16, the number of fixed valve plates 17, and the number of fixed valve legs 18. Specifically:

[0064] like Fig.12 As shown, the fixed valve mounting portion 16 is in the shape of a square or its projection is a square, 12 fixed valve plates 17 are arranged on the outside of the fixed mounting portion 16, and 3 fixed valve plates 17 are arranged on the outside of each side length. Preferably, the fixed valve plates 17 arranged on opposite sides are symmetrical about the central plane of the opposite sides; the fixed valve plates 17 are in the shape of a semicircle, and fixed valve legs 18 are arranged between adjacent fixed valve plates 17, and the fixed valve legs 18 are connected to the top plate 6. In this embodiment, two fixed valve legs 18 are arranged, and the two fixed valve legs 18 are symmetrically arranged about the hypotenuse plane of the square. The number of fixed valve legs 18 can be adjusted according to specific circumstances, and no specific details are given here; the fixed valve legs 18 in this embodiment can be arranged on the outside of the fixed valve plate 17; gaps 19 are arranged between the fixed valve plate 17 and the top sieve hole 9, and between the fixed valve legs 18 and the top sieve hole 9.

[0065] More preferably, in order to improve the gas-liquid contact condition on the upper surface of the fixed valve plate 17, the edge of the fixed valve plate 17 is provided with saw teeth 20 ( Fig.12 not shown).

[0066] Embodiment six:

[0067] In this embodiment, a downcomer 21 is provided between two adjacent cap covers 2, and the downcomer 21 passes through the tower plate 1. The upper part of the tower plate 1 is an upper downcomer 22, and the lower part of the tower plate 1 is a descending liquid pipe 23. The height of the upper downcomer 22 is equal to the height of the cap covers 2. A liquid inlet 24 is provided on the upper downcomer 22. Preferably, the height of the liquid inlet 24 from the tower plate 1 is greater than or equal to 50 mm; a liquid flow hole 26 is provided on the bottom plate 25 of the downcomer 23; the shapes of the liquid inlet 24 and the liquid flow hole 26 can be circular, square, keyway-shaped, irregular, etc., which will not be elaborated on, and the technicians can choose according to the specific situation.

[0068] The upper layer of liquid descends to the tower plate 1, and the gas phase rises from the bottom of the tower plate 1 and bubbles with the liquid flowing on the tower plate 1 through the cap 2 to achieve gas-liquid contact mass transfer. The liquid enters the downcomer 21 through the liquid inlet 24 of the downcomer 21, and then descends to the lower tower plate 1 through the liquid flow hole 26 to carry out gas-liquid mass transfer in the lower layer.

[0069] Embodiment seven:

[0070] The present embodiment describes the downcomer 21 in detail. Specifically, the downcomer 21 includes a body 27, and the body 27 is connected to the tower plate 1. The downcomer 21 is divided into an upper downcomer 22 and a descending liquid pipe 23 through the tower plate 1. The upper part of the tower plate 1 is the upper downcomer 22, and the lower part of the tower plate 1 is the descending liquid pipe 23. The top of the body 27 is connected with a sealing plate 28, and the bottom of the body 27 is connected with a bottom plate 25. The bottom plate 25 is provided with a liquid flow hole 26; the body 27 is provided with a liquid inlet 24 as the entrance of the downcomer 21. The liquid inlet 24 is opened at a certain height from the tower plate 1, and its height is determined according to the gas-liquid load. Preferably, the height of the liquid inlet 24 from the tower plate 1 is greater than or equal to 50 mm; a liquid flow hole 26 is opened on the bottom plate 25 of the downcomer 23 so that the liquid phase can flow into the lower tower plate 1.

[0071] The body 27 can be a hollow cuboid, a hollow cube, a hollow polygonal prism, a hollow cylinder, a hollow irregular body, etc. The technician can choose according to the specific situation. The utility model does not make any specific limitation. The following is a brief description of the body as a hollow cuboid or a hollow cylinder.

[0072] Preferably, if Fig.13 , Fig.14As shown, the main body 27 is a hollow cuboid, which includes a connecting plate 1, a connecting plate 2, a connecting plate 3, and a connecting plate 4 connected in sequence. The connecting plate 1, the connecting plate 2, the connecting plate 3, and the connecting plate 4 are sealed and fixed by well-known methods such as bonding and welding, and can also be connected in an integrated manner. The tops of the connecting plates 1, 2, 3, and 4 are provided with sealing plates 28, and the bottoms of the connecting plates 1, 2, 3, and 4 are provided with bottom plates 25; the above-mentioned connecting plates 1, 2, 3, and 4 are sealed and fixed by well-known methods such as bonding and welding, and can also be formed in an integrated manner; the connecting plates 1, 2, 3, and 4 are all provided with liquid inlets 24.

[0073] Preferably, the main body is a hollow cylinder, a sealing plate 28 is provided on the upper part of the cylinder, a bottom plate 25 is provided on the bottom of the cylinder, the sealing plate 28, the bottom plate 25 and the cylinder are sealed and fixed by well-known methods such as bonding and welding, or they can be formed in an integral manner; a liquid inlet 24 is provided on the outer wall of the cylinder.

[0074] More preferably, an air hole three 29 is provided on one side of the cap 2 adjacent to the downcomer 21, that is, an air hole three 29 is provided on the mounting plate three 11 and the mounting plate four, and the height of the air hole three 29 is higher than the height of the liquid inlet 24; the air hole three 29 can be in any shape such as round, square, keyway, irregular, etc., and the gas is ejected from the air hole three 29; the air hole three 29 increases the gas phase channel and reduces the entrainment of mist.

[0075] Embodiment eight:

[0076] The present embodiment optimizes the downcomer 21. Specifically, an overflow hole 30 is provided on the main body 27. An inclined flap 31 is provided on the outer side of the overflow hole 30. The flap 31 is preferably a rectangular plate, but may also be in other shapes, such as a circular or irregular shape. The flap 31 and the main body 27 may be fixed by welding, bonding, or may be formed in an integral manner. The arrangement of the overflow hole 30 and the flap 31 allows the liquid to flow into the next tower plate 1 through the overflow hole 30 for gas-liquid mass transfer when the flow rate is large.

[0077] More preferably, the flap 31 is provided with flap teeth 32, and the flap teeth 32 can be used to break up the gas phase, thereby achieving better gas-liquid separation.

[0078] The utility model provides an improved mass transfer tower plate, in which the upper liquid descends onto the tower plate 1, the gas phase rises from the bottom of the tower plate 1, and bubbles with the liquid flowing on the tower plate 1 through the cap 2, so as to realize gas-liquid contact mass transfer; the lower part of the cap 2 of the present application is evenly provided with a plurality of sieve holes 4 on the tower plate 1, the gas phase rises from the bottom of the tower plate 1 through the sieve holes 4, and bubbles with the liquid on the tower plate 1, and the arrangement of the sieve holes 4 strengthens the gas-liquid mass transfer and ensures gas-liquid separation; the arrangement of the top sieve holes 9 can relieve the impact force borne by the top plate 6, and is thus suitable for high pressure and large liquid-gas ratio. occasions, and no leakage will occur; preferably, a fixed valve is arranged on the top sieve hole 9, so that the gas moves from the valve to the end of the fixed valve plate, which has a downward secondary film-pulling and breaking mass transfer effect, thereby increasing the gas-liquid contact area, the gas-liquid contact is sufficient, and the mass transfer is more uniform; the kinetic energy factor of the gas coming out from the gap 19 between the fixed valve plate 17 and the top sieve hole 9 and the gap 19 between the fixed valve leg 18 and the top sieve hole 9 is reduced, so the pressure drop is 15-20% lower than that of the traditional floating valve tower plate; after the gas leaves the tower plate 1, the vertical momentum is converted into lateral momentum, so the mist entrainment is small.

[0079] The above-mentioned devices, connection relationships, etc. that are not specifically described belong to the prior art and will not be described in detail in the present utility model.

[0080] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings; however, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, a variety of simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the protection scope of the present application.

[0081] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of this application will not be described separately.

[0082] In addition, the various implementation modes of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.

Claims

1. An improved mass transfer tower tray, comprising a tower plate (1), wherein a plurality of caps (2) are evenly arranged on the tower plate (1), and a plurality of sieve holes (4) are evenly arranged on the tower plate (1) at the lower part of the caps (2); the caps (2) comprise a cap body (5), and a top plate (6) is arranged on the upper part of the cap body (5), and the top plate (6) is connected to the top of the cap body (5), and side plates (7) perpendicular to the top plate (6) are arranged on both sides of the top plate (6), and air holes (8) are opened on the side plates (7), characterized in that: The top plate (6) is provided with a plurality of top sieve holes (9).

2. An improved mass transfer tray according to claim 1, characterized in that: The top plate (6) is provided with a fixed valve (15) at a position corresponding to the top sieve hole (9).

3. An improved mass transfer tray according to claim 2, characterized in that: The fixed valve (15) comprises a fixed mounting portion (16), at least two fixed valve plates (17) are arranged on the outer side of the fixed mounting portion (16), a fixed valve leg (18) is arranged between adjacent fixed valve plates (17) or on the side of the fixed valve plate (17) facing away from the fixed mounting portion (16), the fixed valve leg (18) is connected to the top plate (6), the number of the fixed valve legs (18) is less than or equal to the number of the fixed valve plates (17), and a gap (19) is arranged between the fixed valve plate (17) and the top sieve hole (9) and between the fixed valve leg (18) and the top sieve hole (9).

4. An improved mass transfer tray according to claim 3, characterized in that: The fixed installation portion (16) is in the shape of any one of an arc, a circle, a triangle, a rhombus, a rectangle, an ellipse, a clover leaf, and a racetrack, or the projection shape of the fixed installation portion (16) on the top plate (6) is in the shape of any one of an arc, a circle, a triangle, a rhombus, a rectangle, an ellipse, a clover leaf, and a racetrack.

5. An improved mass transfer tray according to claim 3, characterized in that: The fixed valve plate (17) is in any one of the shapes of an arc, a circle, a semicircle, a cloverleaf, a triangle, a rhombus, a rectangle, and an ellipse, or the projection shape of the fixed valve plate (17) on the top plate (6) is in any one of the shapes of an arc, a circle, a semicircle, a cloverleaf, a triangle, a rhombus, a rectangle, and an ellipse.

6. An improved mass transfer tray according to claim 3, characterized in that: The fixed valve leg (18) is arranged tilted, and the angle between the fixed valve leg (18) and the top plate (6) is 20°-80°.

7. An improved mass transfer tray according to claim 3, characterized in that: The area of ​​the top sieve hole (9) is larger than the projected area of ​​the fixed valve (15) on the top plate (6).

8. An improved mass transfer tray according to claim 2, characterized in that: The fixed valve (15) and the tower plate (1) are integrally formed.

9. An improved mass transfer tray according to claim 3, characterized in that: The edge of the fixed valve plate (17) is provided with saw teeth (20).

10. An improved mass transfer tray according to claim 1, characterized in that: A downcomer (21) is provided between two adjacent cap covers (2), the downcomer (21) passes through the tower plate (1), the upper portion of the tower plate (1) is an upper downcomer (22), the lower portion of the tower plate (1) is a descending liquid pipe (23), the height of the upper downcomer (22) is equal to the height of the cap covers (2), the upper downcomer (22) is provided with a liquid inlet (24), and the bottom plate (25) of the descending liquid pipe (23) is provided with a liquid flow hole (26).

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