Combined flow tray

Abstract

The utility model provides a combined flow tray which comprises a collector, a cover hood and a plurality of sieve pore baffles, the collector is arranged above the cover hood, and the sieve pore baffles are obliquely and symmetrically arranged on two sides in the collector; a plurality of first sieve pores are formed in the sieve pore baffle; a plurality of second sieve holes which are uniformly distributed are formed in two sides of the top of the cap cover, and the collector is communicated with the top of the cap cover; the collector is arranged in the tower body through a tower plate, and a plurality of uniformly distributed third sieve pores are formed in the tower plate. The gas-liquid mass transfer tower has the beneficial effects that the liquid downcomer channel is connected with the gas channel, so that all liquid enters the next layer of tower tray after being subjected to at least one time of gas-liquid mass transfer, and the effectiveness of the gas-liquid mass transfer is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of tower trays, in particular to a composite flow tower tray. Background Art

[0002] Towers are key equipment in the chemical separation process, and tower trays, as an important type of internal parts, play an important role. After years of technological development, many different types of tower trays have been developed, including bubble trays, float valve trays, vertical sieve trays, etc. Some of them have high efficiency but low operating flexibility; some tower trays have relatively large operating flexibility and a lower operating limit, but small flux and low efficiency; some tower trays have large processing capacity and high efficiency, but a high operating limit. In order to cope with complex operating conditions, it is necessary to develop a new type of tower tray that can meet higher efficiency, higher operating upper limit, lower operating limit, and larger flux. Utility Model Content

[0003] In view of this, the utility model aims to propose a composite flow tray to solve at least one of the above problems. The application can meet the requirements of higher efficiency while having a higher upper operating limit, a lower lower operating limit, and a larger flux.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A composite flow tray comprises a collector, a cap, and a sieve baffle, wherein the collector is arranged above the cap, and a plurality of sieve baffles are obliquely and symmetrically arranged on both sides of the collector; the sieve baffle is provided with a plurality of first sieve holes;

[0006] A plurality of evenly distributed second sieve holes are provided on both sides of the top of the cap, and the collector is connected to the top of the cap;

[0007] The collector is arranged in the tower body through a tower plate, and a plurality of evenly distributed third sieve holes are arranged on the tower plate.

[0008] Furthermore, the inclination angle of the sieve baffle is 20°-60°.

[0009] Furthermore, the number of the sieve baffles is 1-4 pairs, and there is a gap between two sieve baffles.

[0010] Furthermore, the collector includes four collecting plates, and the four collecting plates are connected in sequence to form a rectangular shape.

[0011] Furthermore, the diameter of the first sieve hole is 5-20 mm.

[0012] Furthermore, the cap cover includes a support plate, a side plate, and a cover plate, wherein the two support plates are arranged at the front and rear sides of the bottom of the cover plate, the two side plates are arranged obliquely below the cover plate, and the side plates are arranged at the left and right sides of the two support plates.

[0013] Furthermore, the cover plate is in an inverted U shape, the second sieve holes are arranged on both sides of the inverted U-shaped cover plate, a fourth sieve hole is arranged in the middle of the inverted U-shaped cover plate, and the collector is connected to the cap cover through the fourth sieve hole;

[0014] Preferably, the diameters of the second sieve hole and the fourth sieve hole are 5-20 mm;

[0015] Furthermore, a plurality of evenly distributed fifth sieve holes are provided on the two side plates, and the diameter of the fifth sieve holes is 5-20 mm.

[0016] Further, a rectangular opening is provided on the tower plate or a sixth sieve hole is provided on the tower plate;

[0017] The rectangular opening is arranged directly below the cap, and the position of the cap corresponds to the position of the rectangular opening. The third sieve holes are arranged on both sides of the rectangular opening, and the diameter of the third sieve holes is 5-20 mm.

[0018] Or the sixth sieve hole is arranged directly below the cap, the third sieve hole is arranged on both sides of the sixth sieve hole, and the diameter of the sixth sieve hole is 5-20 mm.

[0019] Furthermore, the collector is connected to the cap, the cap is connected to the tower plate, the collector is directly opposite to the cap of the upper tower plate in the tower body, and there is little or no gap between the collector and the upper tower plate;

[0020] Or the collector is connected to the upper tray, the cap is connected to the current tray, the collector and the cap are directly opposite, and there is little or no gap between the collector and the cap cover;

[0021] Furthermore, the shapes of the first sieve hole, the second sieve hole, the third sieve hole, the fourth sieve hole, the fifth sieve hole, and the sixth sieve hole include one or more of circular, elliptical, oblong, semicircular, arc, rectangular, diamond, triangle, clover, heart, plum blossom, and tongue shape.

[0022] The composite flow tray of the present application can be applied to various distillation towers, absorption towers and liquid-liquid extraction towers such as depropanizer, methanol washing section tail gas washing tower, acetic acid azeotropic tower, phenol-containing wastewater extraction tower, etc. The tray of the utility model is composed of only a tower plate and a cap, and no additional liquid downcomer system is provided.

[0023] Compared with the prior art, the composite flow tray described in the utility model has the following advantages:

[0024] 1. The liquid downcomer channel of the present application is connected to the gas channel, so that all liquids enter the next layer of the tower tray after undergoing at least one gas-liquid mass transfer, thereby ensuring the effectiveness of the gas-liquid mass transfer.

[0025] 2. The inclined sieve baffle in the collector has a liquid-conducting function. The first sieve hole allows gas to pass through, and gas-liquid mass transfer can be performed at the baffle.

[0026] 3. The present application improves the efficiency of gas-liquid exchange. The gas in the present application undergoes three gas-liquid mass transfers through the collector baffle, the cap side plate, and the cap cover plate, thereby improving the efficiency of gas-liquid exchange.

[0027] 4. The application has great operational flexibility: when the load is low, the lifting amount of the cap is insufficient, and the liquid leaks to the collector of the next layer. Gas-liquid mass transfer can be carried out in the collector, ensuring the low-load mass transfer efficiency; when the load is high, the gas outside the cap entrains more liquid, and the gas is washed and intercepted once when passing through the collector to enter the upper layer, reducing the entrainment amount and ensuring the high-load mass transfer efficiency.

[0028] 5. The processing capacity of this application is large: because the tower tray structure can still ensure a certain mass transfer efficiency under high load, the maximum processing capacity under the same tower diameter is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0030] Figure 1 This is an overall schematic diagram of the composite flow tray described in an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of a collector according to an embodiment of the utility model;

[0032] Figure 3 A schematic diagram of a cap cover according to an embodiment of the utility model;

[0033] Figure 4 It is a schematic diagram of a tower plate in a tower body according to an embodiment of the utility model;

[0034] Figure 5 This is a front view of a tower plate in a tower body according to an embodiment of the utility model (a rectangular opening is provided on the tower plate);

[0035] Figure 6 This is a front view of a tower plate in a tower body according to an embodiment of the utility model (a sixth sieve hole is provided on the tower plate);

[0036] Figure 7It is a cross-sectional schematic diagram of the composite flow tower tray described in an embodiment of the utility model.

[0037] Description of reference numerals:

[0038] 1. Collector; 101. Collecting plate; 2. Cap; 201. Support plate; 202. Side plate; 203. Cover plate; 3. Sieve hole baffle; 4. First sieve hole; 5. Second sieve hole; 6. Third sieve hole; 7. Fourth sieve hole; 8. Fifth sieve hole; 9. Rectangular opening; 10. Tower plate; 11. Sixth sieve hole. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0041] like Figures 1 to 5 As shown, a composite flow tower plate includes a collector 1, a cap 2, and a sieve baffle 3. The collector 1 is arranged above the cap 2, and a plurality of sieve baffles 3 are obliquely and symmetrically arranged on both sides of the inside of the collector 1; a plurality of first sieve holes 4 are arranged on the sieve baffle 3; a plurality of evenly distributed second sieve holes 5 are arranged on both sides of the top of the cap 2, and the collector 1 is connected to the top of the cap 2; the collector 1 is arranged in the tower body through a tower plate 10, and a plurality of evenly distributed third sieve holes 6 are arranged on the tower plate 10.

[0042] The inclination angle of the sieve baffle 3 is 20°-60°, preferably, the inclination angle is 45°.

[0043] The number of the sieve baffles 3 is 1-4 pairs, and there is a gap between two sieve baffles 3. Preferably, the number of the sieve baffles 3 is 2 pairs.

[0044] The collector 1 includes four collecting plates 101, which are connected in sequence to form a rectangular shape. The diameter of the first sieve hole 4 is 5-20 mm, and the diameter of the first sieve hole 4 is 10 mm;

[0045] The cap cover 2 includes a support plate 201, a side plate 202, and a cover plate 203. The two support plates 201 are arranged at the front and rear sides of the bottom of the cover plate 203. The two side plates 202 are arranged obliquely at the bottom of the cover plate 203, and the side plates 202 are arranged at the left and right sides of the two support plates 201. The cover plate 203 is an inverted U-shape, and the second sieve holes 5 are arranged on both sides of the inverted U-shaped cover plate 203. The fourth sieve hole 7 is arranged in the middle of the inverted U-shaped cover plate 203, and the collector 1 is connected with the cap cover 2 through the fourth sieve hole 7;

[0046] The diameters of the second sieve hole 5 and the fourth sieve hole 7 are 5-20 mm; preferably, the diameters of the second sieve hole 5 and the fourth sieve hole 7 are 10 mm; a plurality of evenly distributed fifth sieve holes 8 are provided on the two side plates 202, and the diameter of the fifth sieve hole 8 is 5-20 mm, preferably, the diameter of the fifth sieve hole 8 is 10 mm.

[0047] A rectangular opening 9 is provided on the tower plate 10 or a sixth sieve hole 11 is provided on the tower plate 10;

[0048] The rectangular opening 9 is arranged directly below the cap 2, and the position of the cap 2 corresponds to the position of the rectangular opening 9. The third sieve holes 6 are arranged on both sides of the rectangular opening 9, and the diameter of the third sieve holes 6 is 5-20 mm.

[0049] Or the sixth sieve hole 11 is arranged directly below the cap 2, the third sieve hole 6 is arranged on both sides of the sixth sieve hole 11, and the diameter of the sixth sieve hole 11 is 5-20 mm.

[0050] The shapes of the first sieve hole 4, the second sieve hole 5, the third sieve hole 6, the fourth sieve hole 7, the fifth sieve hole 8 and the sixth sieve hole 11 include one or more of circular, elliptical, oblong, semicircular, arc, rectangular, diamond, triangle, clover, heart, plum blossom and tongue shapes.

[0051] The collector 1 is connected to the cap 2, the cap 2 is connected to the tower plate 10, the collector 1 is opposite to the cap 2 of the upper tower plate in the tower body, and there is very little or no gap between the collector 1 and the upper tower plate 10; or the collector 1 is connected to the upper tower plate, the cap 2 is connected to the tower plate 10 of this layer, the collector 1 and the cap 2 are opposite to each other, and there is very little or no gap between the collector 1 and the cover plate 203 of the cap 2.

[0052] Embodiment 1:

[0053] In a depropanizer with a large liquid-gas ratio and a limited tower diameter, due to the large molecular weight of the gas phase and low gas velocity, the jet-type tray leaks liquid, resulting in low efficiency. The use of sieve trays or float valve trays will cause mist entrainment at high loads, which will also lead to low efficiency. The use of this structure tray can solve the above problems. At low loads, the square hole at the bottom of the cap leaks liquid, and the liquid falls to the collector baffle of the next layer, then to the top cover of the cap, and then to the sieve holes of the tray. There are still multiple gas-liquid mass transfer opportunities to ensure separation efficiency. At high loads, the gas velocity at the holes of the sieve plate alone is high, which will cause mist entrainment, but the gas must be intercepted at least twice by the top cover / side plate sieve holes and the collector baffle before rising to the upper layer, which minimizes entrainment and ensures separation efficiency.

[0054] Example 2:

[0055] In the tail gas washing tower of the low-temperature methanol washing section, due to the large gas phase load and high empty tower gas velocity, a higher opening rate is required while ensuring that the plate hole kinetic energy factor is within a reasonable range. The traditional tower plate liquid drop system occupies a certain area, resulting in a reduction in the tower plate opening area, limiting the tower plate opening rate, and excessive gas velocity causing a higher mist entrainment rate; at the same time, due to the small liquid phase load, the liquid is not easy to be evenly distributed on the tower plate, and dead zones are easily formed. The tower plate of this structure is used for transformation. Since there is no independent liquid drop system, the opening rate of the structure of this application can reach more than 20%, which effectively reduces the gas velocity. At the same time, the multi-layer sieve hole structure can intercept the mist entrainment to the greatest extent possible; the liquid drop zone is dispersedly distributed on the tower plate and is located around the mass transfer cap. The liquid is updated quickly and it is not easy to form a dead zone. Through improvements in gas-liquid mass transfer and liquid drop, the separation efficiency and processing capacity of the tower are improved.

[0056] Example 3:

[0057] In a company's acetic acid azeotropic tower, the efficiency of the original design of the floating valve tray could not meet the requirements, the acetic acid content at the top of the tower exceeded the standard, and the sec-butyl acetate content in the bottom of the tower exceeded the standard. After replacing the tray with this structure, since the downcomer area is located around the mass transfer cap, the liquid is stirred to break the liquid phase stratification, so that the light components in the liquid phase are more exposed to the gas, which is more conducive to mass transfer; at the same time, the gas-liquid mass transfer is more intense, the liquid phase is broken into smaller droplets, the gas-liquid mass transfer interface is increased, and the tray efficiency is improved. Finally, the indicators of the top and bottom of the tower meet the standards and can operate stably.

[0058] Example 4:

[0059] In some phenol-containing wastewater extraction towers, the sieve plate trays are very easy to clog due to the presence of some solid impurities and oils with high viscosity (tar, etc.) in the wastewater, and increasing the sieve holes will lead to a decrease in separation efficiency. The use of this structure tray for transformation can design larger openings to prevent clogging, and since the multi-layer sieve hole structure between layers increases the mass transfer area compared to the original single-layer tray sieve hole, it will not reduce the efficiency; the baffle of the collector also has a diversion effect, further improving the contact between the two phases, thereby improving the separation efficiency.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite flow tray, characterized in that: The device comprises a collector (1), a cap (2), and a sieve baffle (3); the collector (1) is arranged above the cap (2); a plurality of sieve baffles (3) are obliquely and symmetrically arranged on both sides of the inside of the collector (1); and a plurality of first sieve holes (4) are arranged on the sieve baffle (3); A plurality of evenly distributed second sieve holes (5) are provided on both sides of the top of the cap (2), and the collector (1) is in communication with the top of the cap (2); The collector (1) is arranged in the tower body via a tower plate (10), and a plurality of evenly distributed third sieve holes (6) are arranged on the tower plate (10).

2. A composite flow tray according to claim 1, characterized in that: The inclination angle of the sieve baffle (3) is 20°-60°.

3. A composite flow tray according to claim 1, characterized in that: The number of the sieve hole baffles (3) is 1 to 4 pairs, and there is a gap between two sieve hole baffles (3).

4. A composite flow tray according to claim 1, characterized in that: The collector (1) comprises four collecting plates (101), and the four collecting plates (101) are connected in sequence to form a rectangular shape.

5. The composite flow tray according to claim 1, characterized in that: The diameter of the first sieve hole (4) is 5-20 mm.

6. A composite flow tray according to claim 1, characterized in that: The cap cover (2) comprises a support plate (201), a side plate (202), and a cover plate (203); the two support plates (201) are arranged at the front and rear sides of the bottom of the cover plate (203); the two side plates (202) are arranged obliquely below the cover plate (203); and the side plates (202) are arranged at the left and right sides of the two support plates (201).

7. A composite flow tray according to claim 6, characterized in that: The cover plate (203) is in an inverted U shape, the second sieve holes (5) are arranged on both sides of the inverted U-shaped cover plate (203), a fourth sieve hole (7) is arranged in the middle of the inverted U-shaped cover plate (203), and the collector (1) and the cap (2) are connected through the fourth sieve hole (7); And / or, the diameters of the second sieve hole (5) and the fourth sieve hole (7) are 5-20 mm.

8. A composite flow tray according to claim 7, characterized in that: A plurality of evenly distributed fifth sieve holes (8) are provided on the two side plates (202), and the diameter of the fifth sieve holes (8) is 5-20 mm.

9. A composite flow tray according to claim 8, characterized in that: A rectangular opening (9) is provided on the tower plate (10) or a sixth sieve hole (11) is provided on the tower plate (10); The rectangular opening (9) is arranged directly below the cap (2), and the position of the cap (2) corresponds to the position of the rectangular opening (9). The third sieve hole (6) is arranged on both sides of the rectangular opening (9), and the diameter of the third sieve hole (6) is 5-20 mm. Or the sixth sieve hole (11) is arranged directly below the cap (2), the third sieve hole (6) is arranged on both sides of the sixth sieve hole (11), and the diameter of the sixth sieve hole (11) is 5-20 mm.

10. A composite flow tray according to claim 9, characterized in that: The collector (1) is connected to the cap (2), the cap (2) is connected to the tower plate (10), and the collector (1) is directly opposite to the cap (2) of the upper tower plate in the tower body; Or the collector (1) is connected to the upper layer of the tower plate, the cap (2) is connected to the tower plate (10) of the current layer, and the collector (1) and the cap (2) are located opposite to each other; The shapes of the first sieve hole (4), the second sieve hole (5), the third sieve hole (6), the fourth sieve hole (7), the fifth sieve hole (8), and the sixth sieve hole (11) include one or more of circular, elliptical, oblong, semicircular, arc, rectangular, diamond, triangle, clover, heart, plum blossom, and tongue shapes.

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