A three-dimensional mass transfer enhanced tray

Abstract

The present invention discloses a three-dimensional mass transfer enhanced tray, which is composed of a high-efficiency guide sieve valve tray and a three-dimensional cap. The bottom of the three-dimensional cap is fixed on the tray with rectangular holes. The cap is in the shape of a cuboid, with a reinforcing plate at the bottom, gas-liquid injection holes in the middle, and the upper part covered with corrugated plate packing. Structurally, the gas-liquid mass transfer space is transformed from the tray into the three-dimensional cap, greatly increasing the mass transfer space. The gas sucks the liquid into the cap from the rectangular holes on the tray, and is split into a large number of small droplets under the breaking action of the reinforcing plate, thereby enhancing the mass transfer effect. There is corrugated plate packing above the cap, which can not only effectively intercept the entrained liquid in the rising gas, but also increase the mass transfer effect. The three-dimensional mass transfer enhanced tray of the present invention has the advantages of large production capacity, high mass transfer efficiency, and low pressure drop.

Description

Technical Field

[0001] The present invention belongs to a three-dimensional mass transfer enhanced tray, which belongs to the gas-liquid mass transfer separation equipment in the chemical process. Background Art

[0002] As an important mass transfer and separation equipment, plate columns are widely used in industries such as chemical engineering, oil refining, pharmaceuticals, chemical fertilizers, and environmental protection. Due to the continuous expansion of the scale of high-energy-consuming industries such as petroleum refining and coal chemical industry, the demand for trays with high efficiency, large throughput, and low energy consumption is correspondingly increasing.

[0003] A plate column is a type of separation and contact mass transfer equipment for gas-liquid or liquid-liquid systems, which consists of a tower body, several trays with a certain spacing, and downcomers. Taking gas-liquid operation as an example, when operating, the liquid enters from the top of the tower and, under the action of its own gravity, passes through each tray from top to bottom in turn and is discharged at the bottom of the tower; the gas, under the action of the pressure difference, passes through the gas channels on the tray from bottom to top and performs mass transfer with the liquid on the tray, and finally is discharged from the top of the tower.

[0004] After years of development, sieve trays, valve trays, and three-dimensional trays have emerged one after another, but none of them can combine the characteristics of large processing capacity, high efficiency, and low pressure drop. The sieve tray has a simple structure and low cost, but its small holes are easy to block, and its operating flexibility and plate efficiency are slightly poor. The valve tray has good operating flexibility, but the valve needs to overcome its own gravity when rising, which often leads to a large plate pressure drop and is not satisfactory. The three-dimensional mass transfer tray breaks through the limitation of traditional planar mass transfer of trays, and the gas-liquid mass transfer area develops to the range of inside the hood, spray holes, and tray surface, forming three-dimensional mass transfer in the space between the plate trays, increasing the gas-liquid mass transfer area, improving the processing capacity and mass transfer efficiency, and at the same time greatly reducing the tray pressure drop. By combining the three-dimensional tray with the guide tray and packing, the advantages of various trays are brought into full play, and the effective combination is of great significance for the development of trays. Summary of the Invention

[0005] In order to solve the above-mentioned deficiencies of traditional trays, the present invention discloses a three-dimensional mass transfer enhanced tray, which has a low cost, an increased processing capacity, a significantly increased mass transfer efficiency, and a greatly reduced pressure drop.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: there are trays, a guide hole three-dimensional hood, a bubble promoter is arranged at the liquid inlet of the tray, a reinforcing plate is arranged inside the three-dimensional hood, and a certain height of packing is arranged at the upper part of the three-dimensional hood.

[0007] The technical solution of the present invention is as follows:

[0008] 1. At the liquid inlet of the tray, a bubble promotion device is provided to effectively reduce the thickness of the liquid layer at the inlet, avoid the liquid level drop, and prevent the abnormal gas-liquid mass transfer at the tray inlet. Guide holes are arranged on the tray so that the gas blown out from the guide holes forms a certain angle with the tray, which can not only weaken the entrainment of mist droplets, but also promote the flow of the liquid on the tray, increasing the tray throughput without weakening the mass transfer effect. The positions and quantities of the guide holes are reasonably arranged in the bow region of the tray to avoid the occurrence of mass transfer dead zones on the tray, achieve plug flow on the entire tray, and improve the mass transfer effect of the tray.

[0009] 2. Reinforcement plates are arranged at the bottom inside the three-dimensional cap. The lifted liquid is instantly broken into countless small droplets, greatly increasing the gas-liquid contact area and improving the mass transfer effect. Plate corrugated packing with a certain height is added above the three-dimensional cap. The liquid lifted by the rising gas is further broken for mass transfer, which can not only increase the gas-liquid mass transfer effect, but also effectively reduce the entrainment of mist droplets.

[0010] The working principle of the three-dimensional mass transfer enhanced tray is as follows:

[0011] During operation, the gas enters the cap from the guide holes on the tray and forms a low-pressure area inside the cap. At this time, the liquid on the tray flows into the cap under the action of its own static pressure and the pressure difference inside and outside the cap. The descending liquid is lifted by the rising gas, and after the gas-liquid two-phase flow is fully broken and contacted, they are ejected from the circular separation holes inside the three-dimensional cap together. Part of the gas-liquid flows in parallel inside the three-dimensional cap and enters the regular packing for efficient mass transfer again, and then the gas-liquid is separated. The gas rises to the upper tray after being de-liquefied by the top packing, and the liquid falls back to the tray. The gas-liquid on the tray undergoes six processes: film formation, fragmentation, hitting the top and returning, spraying, parallel-flow packing mass transfer, and separation, making the gas-liquid two-phase always in an efficient dynamic mass transfer process. The gas-liquid load of the three-dimensional mass transfer tray has been greatly improved. The gas throughput can reach more than twice that of the F1 floating valve tray, and the liquid passing capacity can be increased by nearly one time. Moreover, it has obvious advantages in terms of separation efficiency, tray pressure drop, and operation flexibility.

[0012] Compared with the prior art, the three-dimensional mass transfer enhanced tray provided by the present invention has the following beneficial effects:

[0013] 1. Large production capacity

[0014] By reasonably arranging the guide holes on the tray, the plug flow of the liquid on the tray is strengthened. By arranging three three-dimensional caps on the tray, the gas flow channel is increased by more than 1 / 3. By adding a bubble promotion device at the inlet, the liquid level gradient is eliminated, and the leakage of liquid at the liquid inlet is reduced. The gas velocity rising from the sieve holes and guide holes is obliquely upward, extending the movement trajectory of the entrained mist droplets of the gas-liquid, increasing the upper limit of the gas-liquid load, and increasing the production capacity.

[0015] 2. High mass transfer efficiency

[0016] The guiding holes in the bow-shaped area increase the bubbling area on the tray, increasing the opportunity for gas-liquid mass transfer; and overcome the liquid backmixing in the bow-shaped area on the tray, improving the tray efficiency; the bubbling promoter eliminates the liquid surface gradient, reduces weeping and entrainment, making the gas-liquid mass transfer effect better. The three-dimensional cap increases the gas-liquid mass transfer space, effectively breaks up the rising liquid on the tray, increases the contact area with gas and liquid, and improves the tray efficiency.

[0017] 3. Low tray pressure drop

[0018] The three-dimensional mass transfer enhanced tray has a large opening area on the tray, and the gas flow path is smooth. After adding the guiding holes, the liquid thickness on the tray decreases, and the resistance for gas to pass through the liquid layer is reduced, greatly reducing the tray pressure drop.

[0019] 4. Strong anti-blocking ability

[0020] For sticky systems that are prone to clogging the sieve holes, the guiding holes push the liquid to flow on the tray, avoiding the occurrence of abnormal phenomena such as tray clogging due to sticky materials. It has unique advantages in the separation of polymer monomers. Brief description of the drawings

[0021] The invention will be further described below in conjunction with the drawings and embodiments.

[0022] Figure 1 is the top view of the three-dimensional mass transfer enhanced tray

[0023] Figure 2 is the front view of the three-dimensional cap of the three-dimensional mass transfer enhanced tray

[0024] Figure 3 is the left view of the three-dimensional cap of the three-dimensional mass transfer enhanced tray

[0025] Figure 4 is the front view of the guiding hole

[0026] Figure 5 is the cross-sectional view of the guiding hole

[0027] In the figure, 1 is the tray, 2 is the three-dimensional cap, 3 is the reinforcement plate, 4 is the guiding hole, and 5 is the bubbling promoter Detailed implementation manners

[0028] The invention will be further described below in conjunction with the drawings and implementation manners.

[0029] As Figure 1 shown, the figure is the top view of the three-dimensional mass transfer enhanced tray provided by the invention. The top view includes the tray 1 with multiple guiding holes 4 opened, as well as three three-dimensional caps 2 and the bubbling promoter 5 at the liquid inlet of the tray 1.

[0030] As Figure 2 ,3 As shown, they are respectively the front view and the left view of the three-dimensional cap 2 welded on the tray 1 provided by the present invention. At the bottom position of the three-dimensional cap, there is a reinforcing plate 3 at a certain angle to break the liquid flowing into the three-dimensional cap, thereby achieving the gas-liquid mass transfer effect.

[0031] The tray 1 is mainly composed of a number of guide holes and a number of three-dimensional caps. The shape of the guide holes is quadrilateral, including rectangle and trapezoid. The bottom of the three-dimensional cap is rectangular, which is consistent with the shape of the opening on the tray. The side surface of the three-dimensional cap is rectangular or trapezoidal. The upper and lower bottoms of the three-dimensional cap are both quadrilateral, including rectangle and trapezoid, and the upper bottom is the same size as or slightly smaller than the lower bottom.

Claims

1. A three-dimensional mass transfer enhanced tray, comprising a tray (1), a three-dimensional cap (2), and an enhanced plate (3), characterized in that: A bubble promoter (5) is provided at the liquid inlet of the tower plate (1), a reinforcing plate (3) is provided at the liquid inlet at the bottom of the three-dimensional cap (2), and a guide hole (4) is provided on the tower plate; An upwardly protruding bubble promoter (5) is provided at the liquid inlet area of the tray, so that the liquid layer at the inlet becomes thinner and is easily penetrated by the rising gas, thereby ensuring normal contact mass transfer effect between gas and liquid; The guide hole (4) on the plate is a trapezoidal hole of a certain length. The three sides of the guide hole (4) are connected to the tower plate (1), and one side is used as a gas passage. The gas blown out from the guide hole (4) is blown upward at a certain angle to the tower plate (1), thereby pushing the liquid on the plate to flow; A reinforcing plate (3) is installed at the bottom of the three-dimensional cap (2), and the reinforcing plate (3) forms a certain angle with the cap body. When the liquid is lifted by the gas in the cap, the reinforcing plate (3) can break the rising liquid into a large number of small droplets, so that the liquid can fully transfer mass with the gas. The length of the long side of the reinforcing plate (3) is 1 / 2 to 1 of the length of the long side of the three-dimensional cap; The short side width of the reinforcing plate (3) is 1 / 10 to 1 / 3 of the short side width of the three-dimensional cap; The two ends of the long side of the reinforcing plate (3) are at a certain distance from the cover body of the three-dimensional cap cover (2), so as to facilitate the discharge of the accumulated liquid and avoid the formation of dead zones.

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