Composite large and small floating valve

Abstract

The utility model discloses a composite large and small floating valve, and relates to the technical field of tower plate floating valves. The composite large and small floating valve consists of a large floating valve, a valve leg, a guide hole and a small floating valve, the large floating valve is round, a downward round corner part is formed on the edge of a valve plate of the large floating valve, and meanwhile, a large floating valve bulge is formed on the back surface of the valve plate of the large floating valve through stamping, so that a large floating valve gap is generated between the valve plate of the large floating valve and the tower plate during working, the large floating valve gap is 1.5-2mm, and the small floating valve gap is 0.5-1mm, so that gas can still complete mass transfer through the tower plate under the condition of extremely low gas speed. According to the composite large-small floating valve, by introducing the concept of the composite floating valve and the large-small floating valve, the guide hole floating valve of the composite floating valve is arranged, gas-liquid mass transfer is promoted, the design of the large-small floating valve is adopted, the pressure drop of the floating valve is reduced, and the operation performance of a floating valve tower plate is improved; and the problem that the rectification efficiency is reduced due to the fact that the top layer light substance cannot normally open the float valve due to too small gas amount is solved.

Description

Technical Field

[0001] The utility model relates to a high-efficiency distillation tower plate used in a plate-type distillation tower in the chemical industry, in particular to a composite large and small float valve. Background Art

[0002] Floating valve trays are the most commonly used distillation trays due to their high production capacity, large flexibility in pressure drop operation, and high tray efficiency. To reduce manufacturing costs, floating valve trays usually use larger float valve diameters to reduce the number of float valves. However, as the diameter of the float valve increases, the mass of the float valve trays inhibits the performance of the float valve trays. During use, the pressure drop caused by the tray's own weight is too large, and a small amount of gas flow cannot push open the float valve, reducing the separation efficiency of the top layer of light crude oil.

[0003] The most commonly used tower plate in industry is the F1 float valve, but this float valve does not have a guide type, the contact area between the gas phase and the liquid phase is relatively small, the gas-liquid mass transfer efficiency is not high, and the separation efficiency is reduced; the ADV float valve with a guide performance has a limited opening of the guide hole, and the driving force on the liquid is not large, and the effect is not obvious; the composite float valve tower plate currently under development, which is a combination of the tower plate with a guide hole and a trapezoidal float valve, has good mass transfer efficiency, but increases the processing difficulty and cost of the tower plate, which is not conducive to the improvement of old towers.

[0004] Therefore, to develop a good float valve, it is necessary not only to consider good mass transfer effects, increase the gas-liquid contact area, reduce the pressure drop of the tower plate, and improve the separation efficiency of the tower plate, but also to continuously reduce the pressure drop range to ensure the mass transfer efficiency when the gas volume is low in engineering applications; at the same time, it should be achieved at a relatively low cost. Utility Model Content

[0005] The utility model aims to design a composite large and small float valve having guide holes and large and small float valves, which can solve the problems raised by the above-mentioned background technology while meeting the large processing capacity of the tower plate and ensuring the mass transfer efficiency when the gas volume is low.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: a composite large and small float valve, the float valve is composed of a large float valve, a valve leg, a guide hole and a small float valve; the large float valve is circular, and a downward fillet is formed on the edge of the large float valve valve plate, and a large float valve protrusion is formed by stamping on the back of the large float valve valve plate, so that a large float valve gap is generated between the large float valve valve plate and the tower plate during operation, the large float valve gap is 1.5-2mm, and the small float valve gap is 0.5-1mm, so that the gas can still complete mass transfer through the tower plate under extremely low gas velocity conditions; the large float valve valve plate has a diameter of 48-50mm, the radius of the assembly hole on the top of the large float valve valve plate is 6-8mm, the thickness of the large float valve is 1.5-2.5mm, and a single float valve has 3 valves Legs, and a blocking area is added at the bottom of the valve leg to block the rise of the float valve. The lift of the valve leg of the large float valve is 13-15mm; the diameter of the valve plate of the small float valve is 8-10mm, and the valve leg of the small float valve passes through the round hole to be assembled with the large float valve. In order to ensure the working reliability of the small float valve while reducing the pressure drop, the valve thickness of the small float valve is 1mm-1.5mm, and the lift of the small float valve is 10-13mm. A blocking area is added to the bottom of the valve leg to prevent it from detaching from the large float valve; in order to promote the flow of the clear liquid on the upper layer of the float valve, 3 guide holes in the same direction are opened around the assembly hole, and the guide holes are connected to the guide hole The valve plate is 12mm long and 6mm wide, and the gap height reaches a maximum of 1.5mm when the length is 7mm, and a minimum of 0.5mm.

[0007] Compared with the prior art, the beneficial effects of the utility model are as follows: in the technical design of the utility model, by introducing the concepts of a composite float valve and large and small float valves, it not only has the guide hole float valve setting of the composite float valve to promote gas-liquid mass transfer, but also adopts the design of large and small float valves to reduce the pressure drop of the float valve and improve the operating performance of the float valve tower plate.

[0008] The utility model improves the problem that the top layer of light matter cannot normally push open the float valve due to too little gas volume, thus reducing the distillation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional diagram of the utility model;

[0010] Figure 2 It is a bottom view of the utility model;

[0011] Figure 3 This is a structural diagram of a small float valve of the utility model;

[0012] Figure 4 This is a comparison chart of the pressure drops of ADV, F1 type float valves and composite large and small float valves.

[0013] In the figure: 1. large float valve; 2. small float valve; 3. rounded corner; 4. large float valve leg; 5. large float valve block; 6. large float valve lift; 7. small float valve leg; 8. small float valve block; 9. small float valve lift; 10. large float valve gap; 11. assembly hole; 12. small float valve gap; 13. guide hole valve plate; 14. guide hole. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] See also Figure 1-3 The utility model provides a technical solution: a composite large and small float valve, a hole with a radius of 6.5mm is opened on a large valve plate with a valve plate diameter of 48mm, and a small float valve with a valve plate radius of 8mm is assembled with the assembly hole on the large float valve, and the small float valve legs are used to prevent the two from detaching, and at the same time, three parallel guide holes are arranged around the small float valve, and a guide hole valve plate is connected to the guide hole, and the highest point of the guide hole valve plate gap is 1.5mm and the lowest point is 0.5mm.

[0016] In actual work, when the gas flow is very small, the large and small valves are not opened; the gas enters the upper tower plate through the gap between the guide hole and the large and small valves, and the gap between the large float valve and the tower plate; when the gas flow gradually increases, the small float valve can be easily opened, and the airflow passing through the valve body is divided into multiple streams, which increases the gas-liquid contact area and the effective area of ​​the gas channel. The gas distribution is more uniform, which effectively reduces the gas velocity, improves the mass transfer efficiency, and reduces the tower plate pressure drop. As the gas continues to increase, the large float valve is gradually opened until all the float valves are opened.

[0017] Compared with other float valves, the pressure drop operation flexibility of the utility model is increased, and the processing capacity of a single float valve is enhanced, that is, when the gas volume is small, the float valve can still be lifted to ensure the mass transfer process; when the gas volume is large, the gas velocity is effectively reduced to ensure the stability of the float valve during operation.

[0018] The utility model can be widely used in distillation towers, absorption towers, desorption towers, etc. in many industries such as oil refining, petrochemicals, fine chemicals, pharmaceuticals, fertilizers, etc., and is particularly suitable for systems that originally adopted ADV float valves; the utility model can also be used to transform old towers, improve production capacity, save investment, and can also be used to design new towers, reduce tower diameters and tower heights, and reduce costs.

[0019] The key difference between the utility model and the general float valve is that the float valve has a wider pressure drop range and a more stable operation.

[0020] Based on Matlab programming, this utility model conducts a comparative analysis of the dry plate pressure drop of F1, ATV and composite large and small float valves: the specific analysis results are shown in Figure 4 ;

[0021] After comparison, it is concluded that compared with ADV and F1 float valves, the composite float valve significantly reduces the pressure drop of the float valve tray and has good working performance. Figure 4 As shown, the composite large and small float valve can push open the small float valve when the pressure drop is low, and the presence of the small float valve effectively reduces the pressure drop and improves the pressure drop operation flexibility of the float valve tower plate.

[0022] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A composite large and small float valve, characterized in that: include: The large float valve (1) and the small float valve (2) are circular and have a downwardly rounded corner (3) formed at the edge of the valve plate. Meanwhile, a large float valve gap (10) and a small float valve gap (12) are respectively formed by punching on the backs of the large float valve (1) and the small float valve (2). The large float valve gap (10) on the large float valve (1) is 1.5 to 2 mm, and the small float valve gap (12) on the small float valve (2) is 0.5 to 1 mm, so that a gap is generated between the valve plate and the tower plate during operation. A large float valve leg (4) and a small float valve leg (7), the large float valve leg (4) and the small float valve leg (7) are respectively integrally formed on the large float valve (1) and the small float valve (2), and the bottoms of the large float valve leg (4) and the small float valve leg (7) are respectively integrally formed with a large float valve stopper (5) and a small float valve stopper (8) to stop the two from rising; An assembly hole (11), which is integrally formed and opened at the top of the large float valve (1) and allows the small float valve (2) to pass through, and the radius of the assembly hole (11) is 6 to 8 mm; The guide holes (14) are provided on the large float valve (1) at positions outside the assembly hole (11). The guide holes (14) are provided in three groups and are arranged in the same direction. The guide holes (14) are integrally connected to the guide hole valve plates (13).

2. A composite large and small float valve according to claim 1, characterized in that: The guide hole valve plate (13) has a length of 12 mm and a width of 6 mm; the height of the gap between the guide hole valve plate (13) and the large float valve (1) reaches a maximum of 1.5 mm at a length of 7 mm and a minimum of 0.5 mm.

3. A composite large and small float valve according to claim 2, characterized in that: The diameter of the large float valve (1) is 48-50 mm, and the valve thickness of the large float valve (1) is 1.5-2.5 mm; the diameter of the small float valve (2) is 8-10 mm, and the small float valve leg (7) on the small float valve (2) passes through the assembly hole (11) to be assembled with the large float valve (1), and the valve thickness of the small float valve (2) is 1 mm-1.5 mm.

4. A composite large and small float valve according to claim 3, characterized in that: The large float valve leg (4) is located between the large float valve (1) and the large float valve stopper (5) to form a large float valve lift (6), and the large float valve lift (6) is 13-15 mm; the small float valve leg (7) is located between the small float valve (2) and the small float valve stopper (8) to form a small float valve lift (9), and the small float valve lift (9) is 10-13 mm.

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