WO2016082664A1

WO2016082664A1 - Curved cap hood tower plate

Info

Publication number: WO2016082664A1
Application number: PCT/CN2015/093712
Authority: WO
Inventors: 葛红军; 徐丽梅; 杨伟东; 邱玉梅; 沙嘉敏
Original assignee: 南通苏通分离工程科技有限公司
Priority date: 2014-11-25
Filing date: 2015-11-03
Publication date: 2016-06-02
Also published as: WO2016082665A1; CN104492114A; CN104492114B

Abstract

A curved cap hood tower plate. Several square cap hoods (2) are arranged in a tower plate body (1), the several square cap hoods (2) being respectively located on mutually perpendicular straight lines in the tower plate body (1), the tower plate arching from the junctions with the cap hoods (2) to the middle between adjacent cap hoods (2) to form curved areas (3), horizontal areas (4) being present between adjacent curved areas (3). Top portions and bottom portions of the cap hoods (2) are respectively provided with cap covers (5) having upwardly arching centres and cap bottoms (6). The tower plate extends mass transfer time and improves a mass transfer effect.

Description

Curved cap hood

Technical field

The invention relates to a curved cap cover tray, which is a tray installed in a chemical tower device and belongs to the field of chemical equipment.

Background technique

Tower equipment is a gas-liquid, liquid-liquid contact mass transfer equipment commonly used in petroleum and chemical industry, mainly including plate pedals and packed trays. The high-efficiency packed pedal has a high effect and a large production capacity, but it is not suitable for high pressure and easy coking because of its high cost. Compared with packed towers, ordinary slab towers are widely used in China under normal pressure and high pressure conditions due to their low cost.

However, in the case of large liquid absorption, rectification and the like, since the liquid-gas ratio is very large, for example, the liquid-gas molar ratio of the water-eluting carbon is as high as 100 or more. For such working conditions, ordinary plate towers often have an advantage: the liquid receiving area on the tray often occupies a large tower cross-sectional area, resulting in a low processing capacity of the tower. If a packed tower is used, the tower diameter will be designed to be large in order to pass the large liquid volume, and the gas passes through the packing layer at a very low gas velocity, the mass transfer is small, the efficiency is low, the water consumption is large, and the energy consumption is high.

The fixed valve tray has the advantages of large production capacity, high efficiency of the tray, low processing and maintenance cost, and has wide application in the petrochemical industry. At present, the fixed valve trays in the industry are mainly round fixed float valves and strip fixed float valves. The two fixed float valves mainly have the following characteristics: directly punching round and strip on the plane of the tray The protrusion has its edge opening as a gas phase passage, and a valve leg is connected to the tray before and after the valve piece to support the valve piece, and the angle between the valve leg and the plane of the tray is about 90 degrees. For the round valve, the gas outlet is a circular arc, and the gas ejected from the front half of the outlet has a certain pushing effect on the liquid flow on the plate, and the liquid ejected from the rear half of the outlet has a blocking effect on the liquid flow on the plate, before and after The two roles weaken each other. For the strip-shaped fixed float valve, the gas ejection direction is perpendicular to the liquid flow direction, and not only does not have a liquid pushing effect, but also the gas directions ejected by the adjacent two valve sheets are opposite, causing a serious collision phenomenon, which easily causes back mixing. Entrainment of mist, weakening the mass transfer function of the tray and reducing the efficiency of the tray. The tongue-shaped tray has inclined tongue holes, so that the direction of the jet airflow is close to the horizontal, so the mist entrainment is greatly reduced, and the airflow has a propelling effect on the liquid flow, so the gas-liquid flow passing ability is high, and the gas passage is high. The amount is large, the liquid level drop is small, and there is no back mixing phenomenon, which can reduce the pressure drop of the tray. The tongue-shaped tray has the advantages of high efficiency of the tray, thinner liquid layer on the plate, and small pressure drop of the tray. However, the tongue-shaped tray has poor adaptability to load fluctuations, and the operation flexibility is small. The serious gas phase entrainment may cause the plate efficiency to decrease. At the same time, because the liquid layer on the tray is too thin, the liquid residence time is short, and the gas-liquid contact is insufficient. The efficiency is significantly reduced.

The tray and filler composite mainly consists of overflow tray composite filler and through-flow tray composite filler. Because of the simple structure of the flow-through tray and easy packing and compounding, it is the most ideal composite form of tray filler. However, the existing through-flow tray composite filler limits the flexibility and load capacity of the composite tray due to the flooding of the structured packing.

The inventors found through the search that the patent number 200510094252.6 discloses a diamond-shaped fixed float valve. However, due to the presence of the two valve legs, the spray and back mixing phenomena cannot be completely solved. In the petrochemical, petroleum refining, chemical, light industry, environmental protection, pharmaceutical and atomic energy industries, trays and fillers are widely used in chemical unit processes such as distillation, absorption, extraction, absorption, washing, and cooling. The packing has the advantages of high separation efficiency, small pressure drop and large processing capacity, but the cost is large, the operation flexibility is small, and the requirements for the internal parts of the supporting tower are high; the operation of the tray is large, anti-blocking, low cost and relatively high separation efficiency. However, the pressure drop will be larger and the processing capacity will be lower. The tray can be divided into an overflow tray and a through-flow tray according to the presence or absence of a downcomer. In contrast, the existing through-flow type The tray structure is simple, the space utilization in the tower is high, the cost is low, and the processing capacity is large, but the vapor-liquid contact time is short, the mass transfer efficiency is low, and the operation flexibility is small. The ideal inner part of the tower should have the characteristics of low pressure drop, high efficiency, large operational flexibility, anti-blocking, low cost, large processing capacity and high space utilization in the tower. Combining trays and packing is one of the effective ways to achieve the ideal internals. Fiber bundle filler is a newly developed high surface area net-type flexible filler with gas phase and continuous phase. The liquid gas velocity is up to 8m/s, the mass transfer efficiency is high, and the pressure drop is only 1/1 of the normal structured packing. 2-1/3.

The inventor also found the patent 201310401260.5, the patent name is a vertical blown film tray, which includes a horizontal tray and a plurality of caps; the horizontal tray is provided with a plurality of plate holes, and the holes are arranged between the holes; The number of the plates is equal to the number of the caps; the cap includes a vertical tube, a top cover and a bottom bracket open at both ends, and the top cover and the bottom bracket are respectively disposed at the upper open end and the lower open end of the vertical cylinder Wherein, a gap is provided between the top cover and the bottom support and the vertical cylinder; the vertical cylinder is fixed in the hole of the plate, and a gap is provided between the vertical cylinder and the horizontal tray; Both the shape of the cross section and the shape of the base are the same as the shape of the plate aperture, and the projection of the top cover on the horizontal surface may obscure the vertical cylinder. The invention can make the gas pass through the tray in the form of a horizontal blown liquid film, and the pressure drop of the tray is small compared with the conventional tray without the need to overcome the static pressure of the liquid layer. However, the present invention needs to install the caps one by one, the installation process is vast, each cap needs to be installed vertically, the installation requirements are high, and the regular maintenance cost of the caps in the tower is high.

Summary of the invention

In order to solve the above problems, the present invention discloses a curved cap cover tray, and the specific technical solutions are as follows:

The arcuate cap plate comprises a tray body, wherein the rectangular array of the tray body is provided with a plurality of square caps, and the adjacent caps are connected by curved regions, and the arc regions are end to end The surrounding area is a horizontal area, the curved area is arched from the two ends toward the middle, and the two ends of the curved area are fixedly connected with the horizontal area, and the middle and horizontal areas of the curved area are provided with a gap. The top of the cover is provided with an upwardly arched cap, and the bottom of the cap is provided with a downwardly arched cap.

The cap and the bottom of the cap are all circularly shaped in a central shape, and the diameter of the cap is smaller than the side length of the square cap.

The upper surface of the cap is provided with an upper fixing rod fixedly connected to the top edge of the cap, and the upper surface of the cap bottom is provided with a lower fixing rod fixedly connected to the top edge of the cap.

A gap is left between the cap and the cap and the cap.

A gap is left between the periphery of the cap and the tray body, and the tray body is fixedly connected to the cap by a connecting rod.

One end of the connecting rod is fixed to the edge of the tray body near one side of the cap, and the other end is fixed around the cap.

The working principle of the invention is:

The tray body provided with the cap is installed in the liquid gas mass transfer tower device, the gas enters the tower from the bottom of the tower device, the gas rises from the bottom, the gas passes through the centrally arched cap bottom, and the pedal body In the arched area, the gas rushes to the bottom of the central arch, and the arched area of the pedal body. When the gas fills the centrally arched bottom of the cap and the arched area of the pedal body, the gas begins to illuminate the bottom of the cap and the body of the pedal body. The surrounding area overflows, the residence time of the growing gas in the tower body, and can buffer the flow rate of the gas and increase the flow path of the gas. After the gas overflows from the bottom of the cap and the arched area of the pedal body, the gas passes through the pedal body and The gap between the caps continues to rise upwards, and the liquid flows from the top to the bottom. When the gas passes through the gap between the pedal body and the cap, a water film is formed, and the gas from the bottom to the bottom can slowly break the water film and prolong the contact transmission. Quality time, improve the efficiency of mass transfer.

The beneficial effects of the invention are:

The invention realizes the invention that the mass transfer time can be prolonged, the mass transfer effect is improved, the cost input is small, the beneficial effects are outstanding, the installation is simple, and the utility model has good practical value.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention,

Figure 2 is a view taken along line A of Figure 1,

LIST OF REFERENCE NUMERALS 1 - tray body, 2-cap, 3-curved area, 4-horizontal area, 5-cap, 6-cap bottom, 7-upper rod, 8-lower rod, 9 -Connecting rod.

detailed description

The invention will be further elucidated in the following in conjunction with specific embodiments. It is to be understood that the following detailed description is not to be construed as limiting the invention.

1 is a schematic structural view of the present invention. As can be seen from the figure, the arc cap 2 tray comprises a tray body 1. The tray body 1 is provided with a plurality of square caps 2, the plurality of squares. The caps 2 are respectively located on mutually perpendicular straight lines in the tray body 1, and the trays between the adjacent caps 2 are arched from the joint with the cap 2 toward the middle to form an arcuate region 3. According to the present invention, the tray body 1 is installed and fixed in the tower device, and the tray body 1 of the corresponding diameter is designed according to the diameter of the tower device. According to the performance of the mass transfer medium, a cap 2 of corresponding distribution density is arranged on the tray body 1, The square structure of the cap 2 is advantageous for manufacturing, and during use, the gas agglomerates on the surface of the cap 2, and the agglomeration and the body can converge at the four corners of the square to form droplets falling.

The top and bottom of the cap 2 are respectively provided with a cap 5 and a cap bottom 6 which are arched upward in the center, and a gap is left between the cap 5 and the cap 6 and the cap 2. The centrally arched design of the cap 5 and the bottom 6 facilitates gas flow reduction and the lateral expansion of gas in the tower apparatus, increasing the mass transfer efficiency of the gas. A gap is left between the cap 5 and the cap bottom 6 and the cap 2, and the gas and liquid fluids in the tower device are smoothly circulated in order to facilitate the passage of gas and liquid through the unequal height of the tray body 1.

The lower surface of the cap 5 is provided with an upper fixing rod 7 fixedly connected to the top edge of the cap 2, and the upper surface of the cap bottom 6 is provided with a lower fixing rod 8 fixedly connected to the top edge of the cap 2. The upper fixing rod 7 and the lower fixing rod 8 have a positioning and supporting effect on the cap 5 and the cap bottom 6, so that the cap 5 and the cap bottom 6 can be stably fixed to the top and bottom of the cap 2 during use.

There is a gap between the periphery of the cap 2 and the tray body 1 for allowing mass transfer to pass through the tray body 1 through the liquid or gas, and the tray body 1 passes through the connecting rod 9 and the cap 2 The connection is fixed, so that the overall structure of the invention is stable, and the whole structure has a stable connection and fixed relationship during use and installation.

Figure 2 is a view in the direction of arrow A of Figure 1, as seen from the figure, between the adjacent curved regions 3 is a horizontal region 4. The arcuate region 3 is located between any two adjacent caps 2, and the gas rises from below into the arcuate region 3, and then slowly enters from both ends of the arcuate region 3 at both ends of the arcuate region 3 and the cap. Further, the gap between the two is raised from the periphery of the cap 2, and the contact time between the cap 2 and the rising gas and the descending liquid is increased to improve the mass transfer time.

The technical means disclosed in the solution of the present invention is not limited to the technical means disclosed by the above technical means, and includes a technical solution composed of any combination of the above technical features.

In the above, according to the preferred embodiment of the present invention, the relevant staff is completed through the above description. Various changes and modifications can be made without departing from the technical spirit of the invention. The technical scope of the present invention is not limited to the contents of the specification, and the technical scope thereof must be determined according to the scope of the claims.

Claims

The arcuate cap plate comprises a tray body, wherein the rectangular array of the tray body is provided with a plurality of square caps, and the adjacent caps are connected by curved regions, and the arc regions are end to end The surrounding area is a horizontal area, the curved area is arched from the two ends toward the middle, and the two ends of the curved area are fixedly connected with the horizontal area, and the middle and horizontal areas of the curved area are provided with a gap. The top of the cover is provided with an upwardly arched cap, and the bottom of the cap is provided with a downwardly arched cap.
The curved cap shroud of claim 1 wherein the cap and the cap are both circularly shaped in a central shape, the cap having a diameter less than a side of the square cap.
The curved cap plate according to claim 2, wherein the lower surface of the cap is provided with an upper fixing rod fixedly connected to the top edge of the cap, and the upper surface of the cap bottom is provided with a fixed connection Lower mounting bar at the top edge of the cap.
The curved cap shroud of claim 3 wherein there is a gap between the cap and the cap and the cap.
The curved cap plate according to claim 4, wherein a gap is left between the periphery of the cap and the tray body, and the tray body is fixedly connected to the cap by a connecting rod.
The curved cap plate according to claim 5, wherein one end of the connecting rod is fixed to an edge of the tray body near one side of the cap, and the other end is fixed around the cap.