CN216856642U

CN216856642U - Cyclone falling film gas-liquid distributor

Info

Publication number: CN216856642U
Application number: CN202123352917.2U
Authority: CN
Inventors: 张玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-07-01
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a cyclone falling film gas-liquid distributor, which comprises an outer cylinder and a central cylinder, wherein the outer cylinder is formed by processing a thin-wall steel pipe, and is sequentially communicated with a gas-phase rotary vane inlet section, a liquid-phase falling film section, a reducing section and an expanding section from top to bottom, the central cylinder comprises a cover plate and a downcomer, a plurality of gas inlets penetrating through the inside and the outside are formed in the cylinder wall of the upper part of the downcomer, the lower part of the downcomer is processed into a reducing section, a jet hole is formed in the lower end part of the downcomer, and rotary vanes are arranged on the inner wall of the gas-phase rotary vane inlet section. According to the cyclone falling film gas-liquid distributor, the gas inlet hole is formed in the upper portion of the descending pipe, the lower end portion jet hole is formed in the lower portion of the descending pipe, a part of gas phase can be enabled to pass through the interior of the descending pipe and jet out high-speed airflow through the lower end portion jet hole, the energy of shredding center confluence and spreading to the periphery is enhanced, small liquid drops are further formed, the center confluence is reduced, and the better use prospect is brought.

Description

Cyclone falling film gas-liquid distributor

Technical Field

The utility model relates to the technical field of component equipment in a reactor in the petrochemical industry, in particular to a rotational flow falling film gas-liquid distributor.

Background

In recent years, with the gradual upgrade of quality standards of petrochemical products and the stricter of environmental regulations, the hydrogenation technology plays an important role in the refining industry, and the refining industry rapidly expands the hydrotreating capability of various oil products for further utilizing precious petroleum resources.

Fixed bed hydrogenation reactors are widely used in devices for catalyzing gas phase and liquid phase hydrogenation reactions, and common fixed bed hydrogenation reactors are trickle bed reactors. For a trickle bed reactor, the fluid distribution directly affects the uniformity of contact of reactants with the catalyst, affects the degree of wetting of the inner and outer surfaces of the catalyst by liquid, and affects the distribution of bed temperature and product quality. Especially, when the reactor is enlarged and the product is refined, the uniformity of the fluid distribution is very important. If a gas-liquid distributor serving as an inner component of the reactor cannot ensure that gas and liquid phases are uniformly distributed on the surface of a bed layer, even if the quality of a raw material liquid is improved or a high-activity catalyst is adopted, once channeling and short circuit occur in a catalyst bed layer, the local temperature of the bed layer can be increased more quickly, the activity of the catalyst is influenced or side reaction occurs in the bed layer, and finally local coking is caused due to nonuniform reaction. The performance of the gas-liquid distributor is particularly important throughout the production process. The existing gas-liquid distributors can be divided into three categories according to the mode of liquid phase entering the distributor: suction, overflow and a combination thereof.

The pumping type gas-liquid distributor has low requirement on installation levelness, and the gas-liquid distribution performance is not ideal. The uniform distribution degree of the fluid is enhanced by means of opening holes on the cap cover, arranging a liquid crushing plate and the like, but the defects of large pressure drop, central confluence, inapplicability to liquid media with large viscosity and the like exist.

The overflow type gas-liquid distributor has a simple structure compared with a suction type gas-liquid distributor, a liquid phase enters a downcomer through an overflow hole, the pressure drop is small, and the overflow type gas-liquid distributor is more suitable for a medium with high viscosity. The fluid distribution is often made more uniform by means of increased gas-liquid contact area, complex breaker plates, etc. However, due to the limitation of the structure of the overflow type gas-liquid distributor, enough distributors are required to be installed to achieve the effect of uniform distribution, the distributor is not suitable for the working condition with large gas-liquid load, the adjusting means is too single, the requirement of the distribution uniformity on the installation levelness is high, certain adverse effect is brought to the use process of people, and therefore the cyclone falling film gas-liquid distributor is provided.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a cyclone falling film gas-liquid distributor which can effectively solve the problems in the background technology.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a rotational flow falling film gas-liquid distributor comprises an outer cylinder and a central cylinder, wherein the outer cylinder is formed by processing a thin-wall steel pipe and is sequentially communicated with a gas-phase rotary vane inlet section, a liquid-phase film falling section, a reducing section and an expanding section from top to bottom, the central cylinder comprises a cover plate and a downcomer, a plurality of gas inlets which penetrate through the downcomer from inside to outside are formed in the cylinder wall of the upper portion of the downcomer, the lower portion of the downcomer is processed into a reducing section, a jet hole is formed in the lower end portion of the downcomer, and rotary vanes are arranged on the inner wall of the gas-phase rotary vane inlet section.

Preferably, the gas phase rotary vane inlet section is formed by punching an outer cylinder thin-wall steel pipe, the rotary vanes are in arc transition and are uniformly distributed along the circumference, and the inlet area of the gas phase rotary vane inlet section is larger than the cross sectional area of the gas-liquid distributor.

Preferably, the liquid phase falling film section is formed by arranging a plurality of through overflow holes on the periphery of the outer cylinder thin-wall steel pipe below the gas phase rotary vane inlet section, and the overflow holes can be round, strip-shaped and the like.

Preferably, the overflow holes are uniformly arranged along the circumference and are positioned at the same horizontal position, the reducing section is in an inverted cone shape, the half vertex angle of the reducing section is 15-45 degrees, the expanding section is in a cone shape, the half vertex angle of the expanding section is 30-60 degrees, the connecting part of the reducing section and the expanding section is in arc transition, the cover plate is processed by a steel plate, and the cover plate can be in a circular shape, a square shape, a polygonal shape and the like; the external dimension of the outer cylinder is larger than the external diameter of the outer cylinder.

Preferably, the air inlet holes in the upper cylinder wall of the downcomer are a plurality of air inlet holes formed through the wall of the downcomer, the air inlet holes can be circular, strip-shaped and the like, the air inlet holes are uniformly distributed along the circumference, the tapered section is in an inverted cone shape, and the half vertex angle of the tapered section is 15-45 degrees.

Preferably, the small holes at the lower end part of the downcomer are circular, the diameter of the small holes is 2-10mm, a certain gap is reserved between the outer cylinder and the central cylinder, the gap is kept straight from top to bottom, and the outer cylinder and the central cylinder are positioned and connected through end plates.

Compared with the prior art, the utility model has the following beneficial effects: the cyclone falling film gas-liquid distributor integrates the functions of cyclone and falling film, enhances the distribution effect of fluid by combining three modes of gas-phase cyclone, liquid-phase falling film uniform distribution and Venturi effect, has good gas-liquid mixing and fluid distribution uniformity, high operation elasticity, no central confluence and reduced pressure in the treatment process, and is suitable for treating liquid medium with high viscosity; the gas phase rotary vane inlet section can realize the rotary flow of the gas phase and can form strong uniform distribution and dispersion capacity and tearing capacity of a liquid film; the gap between the outer cylinder and the central cylinder is a main gas-liquid two-phase flow channel, and the inner wall of the outer cylinder and the outer wall of the central cylinder jointly form the surface area required by the liquid-phase falling film, so that the surface area is increased by nearly one time, a larger gas-liquid contact surface area is formed, and gas dissolution and liquid-phase dispersion and shredding are facilitated; the reducing section and the descending pipe reducing section jointly form an accelerating section, the gas-liquid speed difference is further increased in the accelerating section, and the reinforced liquid phase is dispersed and shredded into small liquid drops; the expanding section is a deceleration diffusion section, the gas-liquid phase speed at the expanding section is decelerated at the same time and is dispersed downwards along a diffusion angle, and the wetting area of the lower part of the distributor is increased and the central confluence is reduced due to the diffusion angle and strong rotational flow; the upper air inlet hole and the lower end jet hole of the downcomer enable a part of gas phase to pass through the interior of the downcomer and jet high-speed airflow through the lower end jet hole, so that the energy of converging and diffusing to the periphery in the shredding center is enhanced, small liquid drops are further formed, the converging in the center is reduced, the whole cyclone falling film gas-liquid distributor is simple in structure and convenient to operate, and the using effect is better than that of a traditional mode.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a cyclone falling film gas-liquid distributor according to the present invention.

Fig. 2 is a schematic structural diagram of a gas-phase rotating vane inlet section 11 in fig. 1 of a cyclone falling film gas-liquid distributor according to the present invention.

Fig. 3 is a schematic structural view of the overflow hole 120 in fig. 1 of the swirling falling film gas-liquid distributor according to the present invention.

In the figure: 10. an outer cylinder; 11. a gas phase rotary vane inlet section; 12. a liquid phase falling film section; 13. a reducing section; 14. a diameter expanding section; 110. rotating leaves; 120. an overflow aperture; 20. a central barrel; 21. a cover plate; 22. a down pipe; 220. an air inlet; 221. a tapered section; 222. and ejecting the hole.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1-3, a cyclone falling film gas-liquid distributor comprises an outer tube 10 and a central tube 20, wherein the outer tube 10 is made of thin-walled steel tube, and is sequentially communicated with a gas phase cyclone inlet section 11, a liquid phase falling film section 12, a reducing section 13 and an expanding section 14 from top to bottom, the central tube 20 comprises a cover plate 21 and a down pipe 22, a plurality of gas inlets 220 penetrating inside and outside are arranged on the tube wall of the upper part of the down pipe 22, the lower part of the down pipe 22 is made into a reducing section 221, a spray hole 222 is arranged at the lower end part of the reducing pipe, and the inner wall of the gas phase cyclone inlet section 11 is provided with a cyclone 110.

Example two:

on the basis of the first embodiment, as shown in fig. 1, the gas phase rotary vane inlet section 11 is formed by punching an outer cylinder thin-wall steel pipe, the rotary vanes 110 are in arc transition and are uniformly distributed along the circumference, the inlet area of the gas phase rotary vane inlet section 11 is larger than the cross-sectional area of the gas-liquid distributor, the liquid phase precipitation section 12 is formed by arranging a plurality of through overflow holes 120 along the periphery on the outer cylinder thin-wall steel pipe below the gas phase rotary vane inlet section 11, the overflow holes 120 can be circular, strip-shaped and the like, the overflow holes 120 are uniformly distributed along the circumference and are positioned at the same horizontal position, the diameter reduction section 13 is in an inverted cone shape, the half vertex angle of the diameter reduction section is 15 degrees to 45 degrees, the diameter expansion section 14 is in a cone shape, the half vertex angle of the diameter reduction section is 30 degrees to 60 degrees, the connecting part of the diameter reduction section 13 and the diameter expansion section 14 is in an arc transition, and the cover plate 21 is made of a steel plate and can be in a circular shape, a square, a polygon and the like; the external dimension of the air inlet is larger than the external diameter of the outer cylinder 10, the air inlet 220 on the upper cylinder wall of the downcomer 22 is a plurality of air inlets 220 which are arranged through the wall of the downcomer, the air inlets 220 can be circular, strip-shaped and the like, the air inlets 220 are uniformly arranged along the circumference, the reducing section 221 is in an inverted cone shape, the half vertex angle is 15-45 degrees, small holes at the lower end of the downcomer 22 are circular, the diameter of the small holes is 2-10mm, a certain gap is reserved between the outer cylinder 10 and the central cylinder 20, the gap is kept constant from top to bottom, and the two are positioned and connected through end plates, so that the integral structure stability of the cyclone falling film gas-liquid distributor is facilitated.

It should be noted that the present invention is a cyclone falling film gas-liquid distributor, when in use, the gas phase in the material enters the gap between the outer cylinder 10 and the central cylinder 20 tangentially through the rotary vane inlet section 11, and forms strong rotating flow to move downwards. After a liquid layer with a certain height is formed in a liquid phase in a material, the liquid phase enters a gap between the outer cylinder 10 and the central cylinder 20 through the overflow holes 120 under the suction action of overflow and rotating airflow, and under the action of rotating airflow, uniform liquid film distribution is formed on the inner wall of the liquid phase film falling section 12 and the outer wall of the down pipe 22, as the liquid phase film falling section 12 and the outer wall of the down pipe 22 jointly form a surface area required by a liquid phase falling film, the surface area is increased by nearly one time, a larger gas-liquid contact surface area is formed, which is beneficial to the dissolution of gas and the dispersion and tearing of the liquid phase, then the gas phase rotational flow generates impact and shearing on the liquid phase, so that the liquid film is crushed and atomized and mixed with the gas phase for dissolution, when the gas and the liquid reach an annular gap formed by the reducing section 13 and the reducing section 221, the gas phase rotational flow further increases the gas-liquid velocity difference, and the gas phase rotational flow generates larger impact and shearing on the liquid phase, so that the liquid film is further crushed and atomized, the gas-liquid mixing and dissolution are increased. After passing through the annular space formed by the reducing section 13 and the reducing section 221, gas-liquid two-phase atomized particles enter the expanding section 14, the gas-liquid phase speed at the section is simultaneously reduced and is dispersed downwards along a diffusion angle, the wetting area of the lower part of the distributor is increased and the central confluence is reduced due to the diffusion angle and strong rotational flow, and in order to further atomize the particles and reduce the central confluence, the utility model can ensure that a part of gas phase passes through the inner part of the descending pipe 22 and is sprayed with high-speed gas flow through the lower end part spraying hole 222 by arranging the gas inlet 220 and the lower end part spraying hole 222 on the upper part of the descending pipe 22, so that the energy of tearing central confluence and diffusion to the periphery is enhanced, small liquid drops are further formed and the central confluence is reduced, and the device is practical.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, and such changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A cyclone falling film gas-liquid distributor comprises an outer cylinder (10) and a central cylinder (20), and is characterized in that: the outer cylinder (10) is formed by processing a thin-wall steel pipe, and is communicated with a gas phase rotary vane inlet section (11), a liquid phase film falling section (12), a reducing section (13) and an expanding section (14) from top to bottom in sequence, the central cylinder (20) comprises a cover plate (21) and a descending pipe (22), a plurality of air inlets (220) which are penetrated from inside to outside are formed in the cylinder wall of the upper part of the descending pipe (22), the lower part of the descending pipe (22) is processed into a reducing section (221), an injection hole (222) is formed in the lower end part of the descending pipe, and rotary vanes (110) are arranged on the inner wall of the gas phase rotary vane inlet section (11).

2. A falling film gas-liquid distributor according to claim 1, wherein: the gas phase rotary vane inlet section (11) is formed by stamping an outer cylinder thin-wall steel pipe, the rotary vanes (110) are in arc transition and are uniformly distributed along the circumference, and the inlet area of the gas phase rotary vane inlet section (11) is larger than the cross-sectional area of the gas-liquid distributor.

3. A falling film gas-liquid distributor according to claim 1, wherein: the liquid phase falling film section (12) is formed by arranging a plurality of through overflow holes (120) on the outer cylinder thin-wall steel pipe below the gas phase rotary vane inlet section (11) along the periphery, and the overflow holes (120) can be round and strip-shaped.

4. A falling film gas-liquid distributor according to claim 3, wherein: the overflow holes (120) are uniformly arranged along the circumference and are positioned at the same horizontal position, the reducing section (13) is in an inverted cone shape, the half vertex angle of the reducing section is 15-45 degrees, the expanding section (14) is in a cone shape, the half vertex angle of the expanding section is 30-60 degrees, the connecting part of the reducing section (13) and the expanding section (14) is in arc transition, the cover plate (21) is formed by processing a steel plate, and the shape of the cover plate can be circular, square or polygonal; the outer dimension of the outer cylinder is larger than the outer diameter of the outer cylinder (10).

5. A falling film gas-liquid distributor according to claim 1, wherein: the air inlet holes (220) in the upper cylinder wall of the downcomer (22) are a plurality of air inlet holes (220) formed through the wall of the downcomer, the air inlet holes (220) can be circular and strip-shaped, the air inlet holes (220) are uniformly distributed along the circumference, the tapered section (221) is in an inverted cone shape, and the half vertex angle of the tapered section is 15-45 degrees.

6. A falling film gas-liquid distributor according to claim 1, wherein: the small holes at the lower end part of the downcomer (22) are circular, the diameter of the small holes is 2-10mm, a certain gap is reserved between the outer cylinder (10) and the central cylinder (20), the gap is kept constant from top to bottom, and the outer cylinder and the central cylinder are positioned and connected through end plates.