CN116726522A - Distributor with multilayer nested structure and devolatilization tower - Google Patents

Abstract

The application discloses a distributor and a devolatilization tower with a multilayer nested structure, which comprise a first component, a second component and a third component, wherein the second component is sleeved on the outer side of the first component; the third component is located between the first component and the second component; the first component comprises a feeding structure and a plurality of holes, the second component comprises a distribution structure, a plurality of exhaust holes and a plurality of liquid distribution holes, and the third component comprises a foam breaking structure and a plurality of foam breaking holes. According to the application, the distributor is designed into a multi-layer nested structure, the inner-layer feeding structure conveys fluid to the foam breaking structure with foam breaking holes, the foam breaking holes are used for separating gas phase from liquid phase of the fluid, and then the outermost liquid distribution holes are used for distributing the fluid, so that the gas-liquid separation effect is good, and the high-viscosity fluid can stably flow out under various process conditions; the stable and uniform falling film is easy to form on the surface of the falling film element, and the devolatilization efficiency is improved.

Description

Distributor with multilayer nested structure and devolatilization tower

Technical Field

The application relates to the technical field of devolatilization towers, in particular to a distributor with a multilayer nested structure and a devolatilization tower.

Background

Devolatilization is an important step in chemical production in the prior art, and the task is to transfer volatile substances from a liquid phase to a gas phase for discharge from a fluid. The devolatilization effect directly affects the quality and application field of the product, and the importance is inferior to the polymerization reaction process and process formula.

At present, various devolatilization devices are applied to the industrial field, and the dynamic rotary devolatilization devices represented by screw extruders and disc ring polycondensation reactors have the advantages of strengthening surface renewal, uniformly mixing materials and the like by means of rotary stirring elements, but have complicated structures and high manufacturing and running costs. The distributor refers to a liquid distribution device arranged at the top of the packed tower; the function is to uniformly distribute the liquid across the column, thereby ensuring high efficiency operation; most of the distributor bags in the prior art have a single-layer structure with a plurality of liquid distribution holes, high-viscosity fluid directly flows out of the liquid distribution holes after entering the distributor, gas phase and liquid phase in the fluid cannot be separated, and the condition that the fluid flow is unstable or even discontinuous easily occurs; when the fluid passing through the distributor freely falls down the film under the action of gravity and inertia force in the outside of the pipe or in the smooth straight plate type devolatilization tower, the viscosity of the solution is larger, the falling film time is longer, the condition that partial fluid is not devolatilized or the devolatilization effect is poor exists, the falling film time is uncontrollable, the devolatilization efficiency is low, and the obtained product quality is nonuniform. If the devolatilization efficiency and quality are required to be ensured, the fluid must be remixed and then devolatilized for multiple times, so that the cost is high and the efficiency is low.

In this regard, chinese patent CN211836346U discloses a distributor and an evaporator having the same. The distributor comprises a distributor body with a feeding cavity, wherein the distributor body is provided with a feeding hole communicated with the feeding cavity, the distributor body is provided with a plurality of uniformly distributed sprinkling holes, and all sprinkling holes are communicated with the feeding cavity; and the feed inlet and the material spraying hole are respectively positioned on the two connected surfaces. The evaporator comprises an evaporator shell with a gas phase outlet and a material outlet, and the evaporator shell is internally provided with the distributor. However, the distributor still cannot separate the gas phase from the liquid phase, when the fluid passing through the distributor flows on the tower plate, the static friction force is large, the flow resistance is large, the fluid is difficult to distribute on the tower plate, the film layer is thicker, the falling film is difficult to realize, and the devolatilization effect is poor.

Therefore, in order to solve the above problems, a distributor and a devolatilization tower with a multilayer nested structure are designed, and gas phase and liquid phase in fluid are effectively separated through multiple times of bubble breaking, so that the gas-liquid separation effect is good, the problem of unstable falling film flow in the prior art is solved, and the devolatilization efficiency is improved, so that the method is necessary for a person skilled in the art.

Disclosure of Invention

The application aims to provide a distributor and a devolatilization tower with a multilayer nested structure, which effectively separate gas phases in fluid flowing out of a heat exchanger, ensure that high-viscosity fluid can stably flow out under various process conditions and strengthen the devolatilization effect.

A distributor with a multilayer nested structure comprises a first component and a second component, wherein the second component is sleeved on the outer side of the first component; at least one third component is arranged between the first component and the second component; the first subassembly includes feeding structure and sets up a plurality of trompils on feeding structure, the second subassembly includes distribution structure, sets up a plurality of exhaust holes at distribution structure top and sets up a plurality of cloth liquid holes in distribution structure bottom, the third subassembly includes broken bubble structure and is located a plurality of broken cells on the broken bubble structure.

Preferably, the feeding structure, the distributing structure and the foam breaking structure are hollow structures.

Preferably, the third component is sleeved on the first component and is located inside the second component, that is, the second component is sleeved on the third component.

Preferably, the number of the third components is 1, and 1 third group price is sleeved on the first component and is positioned in the second component, namely the second component is sleeved on the third component.

Preferably, the number of the third components is at least 2, and the third components are sleeved in sequence from inside to outside.

Preferably, the feed structure comprises one or more of a tubular structure, a columnar structure, a conical structure, a frustoconical structure, and most preferably a cylindrical tubular structure.

Preferably, the first component is partially located inside the second component, the first component is partially located outside the second component, the end of the portion of the feeding structure located inside the second component is a semi-closed end, and the end of the portion of the feeding structure located outside the second component is a first open end.

Preferably, a plurality of said openings are uniformly distributed over said semi-closed end, said openings being adapted to uniformly disperse the highly viscous fluid flowing into the feed structure into the third assembly.

Preferably, the size of each opening is the same, or the size of each opening gradually increases from the middle part of the semi-closed end to the outside, or the size of each opening gradually decreases from the middle part of the semi-closed end to the outside.

Preferably, the shape of each of the openings is the same or the shape of each of the openings is different; the shape of the aperture includes, but is not limited to, one of a circular hole shape or a polygonal structure; including but not limited to triangles, quadrilaterals, pentagons, hexagons, pentagons, and stars.

Preferably, the first open end of the feed structure is in communication with the heat exchanger, the feed structure being for receiving the high viscosity fluid exiting the heat exchanger.

Preferably, the distribution structure comprises one or more of a tubular structure, a columnar structure, a conical structure, and a truncated cone structure.

Preferably, a first component placement hole is formed in the middle of the upper end face of the distribution structure, and the exhaust holes are distributed around the first component placement hole.

Preferably, the size of the vent holes and the spacing between adjacent vent holes vary as the throughput of the highly viscous fluid varies.

Preferably, the first component placement hole is used for inserting the first component.

Preferably, the liquid distribution holes are uniformly distributed on the lower end surface of the distribution structure.

Preferably, the size of the liquid distribution holes is the same as or slightly larger than the size of the foam breaking holes.

Preferably, the liquid distribution holes are all the same in size, or the sizes of the liquid distribution holes gradually increase from the middle of the lower end surface of the distribution structure to the outside.

Preferably, the lower end face of the distribution structure is provided with a plurality of liquid distribution holes, and the quantity of the liquid distribution holes in each row is the same.

Preferably, the size of the liquid distribution holes increases with the viscosity of the high-viscosity fluid, and the diameter of the liquid distribution holes ranges from 1mm to 50mm.

Preferably, the foam breaking structure comprises one of a columnar structure and a truncated cone-shaped structure.

Preferably, the first component, the second component and the third component are detachably connected or integrally formed.

Preferably, the sizes of the plurality of foam breaking holes are the same, or the sizes of the plurality of foam breaking holes are sequentially increased from top to bottom, or the sizes of the plurality of foam breaking holes are sequentially decreased from top to bottom, or the plurality of foam breaking holes are grouped and sequentially arranged.

Preferably, the shape of the broken cell comprises one of a circular hole shape or a polygonal structure; including but not limited to triangles, quadrilaterals, pentagons, hexagons, pentagons, and stars.

Preferably, the spacing between each of the broken cells is the same, or the spacing between the broken cells increases sequentially from top to bottom, or the spacing between the broken cells decreases sequentially from top to bottom.

Preferably, one end of the foam breaking structure, which is close to the liquid distribution hole, is a closed end, and one end of the foam breaking structure, which is close to the first component placement hole, is a second open end, and the second open end is used for being inserted into the first component.

Preferably, a plurality of the foam breaking holes are uniformly distributed on the side surface of the foam breaking structure.

Preferably, a space is provided between the broken cell closest to the closed end and the closed end.

Preferably, the height of the broken cells is d, and the distance between the broken cells closest to the closed end and the closed end is d to 10d, more preferably 2d to 5d.

Preferably, the height of the semi-closed end of the first component is the same as the height of the lowest foam breaking hole in the foam breaking structure, or the semi-closed end of the first component is located between the closed end of the foam breaking structure and the lowest foam breaking hole.

Preferably, the distance between the foam breaking structure closest to the second component and the second component is 1/3-9/10 of the height of the second component, more preferably 1/2-9/10; most preferably 2/3 to 4/5.

Preferably, the structural parameters of the broken cells, i.e. the shape and size of the broken cells, are varied according to the variation of the viscosity of the fluid flowing into the first component.

Preferably, the size of the foam breaking holes increases with the viscosity of the high-viscosity fluid, and the diameter ranges from 1mm to 50mm.

Preferably, the diameter of the closed end of the first component ranges: 10mm-1000mm; height range: 5mm-100mm.

Preferably, the second assembly bottom diameter is greater than the diameter of the closed end of the first assembly, the second assembly bottom diameter ranging: 10mm-1000mm; height range: 10mm-200mm.

Preferably, the bottom diameter of the third component is greater than the diameter of the semi-closed end of the first component and less than the bottom diameter of the second component.

The application also claims a devolatilization tower comprising a tower body, a distributor with a multi-layer nested structure as described above located inside the tower body and a devolatilization tower internals above which the fluid distributor is located.

Preferably, the first open end of the feed structure in the distributor is connected to the column and receives the high viscosity fluid exiting the heat exchanger.

In the above description, the principle of breaking foam holes in the distributor is as follows: the high-viscosity fluid flowing out of the heat exchanger enters the devolatilization tower and flows into the first component, and uniformly flows to the third component through the opening in the first component; as the foam breaking holes are uniformly formed in the side surface of the foam breaking structure in the third component, and the bottom of the foam breaking structure is a closed end, the foam breaking structure starts to be piled up at the closed end after high-viscosity fluid flows into the foam breaking structure, and the foam breaking structure is extruded along the foam breaking holes on the side surface of the foam breaking structure after being piled up to a certain height, and gas-liquid two-phase separation occurs in the extrusion process.

In the above, the workflow of the distributor is: after the high-viscosity fluid enters the first component, the high-viscosity fluid is uniformly guided into the third component through the holes in the first component, the high-viscosity fluid starts to be accumulated at the closed end of the third component, is extruded along the foam breaking holes on the side surface of the foam breaking structure after being accumulated to a certain height and is separated into gas phase and liquid phase, and the separated liquid phase flows into the bottom of the distribution structure along the outer side surface of the foam breaking structure and flows out of the distributor under the action of gravity from the liquid distribution holes on the bottom; the separated gas phase is discharged from the distributor through the exhaust holes on the upper end surface of the distribution structure.

Due to the application of the technical scheme, compared with the prior art, the application has the following advantages:

1. compared with the traditional distributor, the distributor is designed into a multi-layer nested structure, the inner-layer feeding structure conveys fluid to the foam breaking structure with foam breaking holes, the foam breaking holes are used for separating gas phase from liquid phase of the fluid, and then the outermost liquid distribution holes are used for distributing the fluid, so that the gas-liquid separation effect is good, the high-viscosity fluid can stably flow out under various process conditions, and the problems of unstable falling film flow and even interruption are avoided; the stable and uniform falling film is easy to form on the surface of the falling film element, and the devolatilization efficiency is improved.

2. The product of the application has simple structure, lower cost and good commercialization significance, and is suitable for popularization and application.

3. The first component and the broken foam holes distributed on the first component, the second component and the vent holes, the liquid distribution holes, the size and the shape of the product are adjustable, and the viscosity range of the applicable system is wide.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that some drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic overall structure of a first embodiment of the present application.

Fig. 2 is a schematic structural diagram of a first component according to a first embodiment of the present application.

Fig. 3 is a schematic structural diagram of a second component according to a first embodiment of the application.

Fig. 4 is a schematic structural diagram of a second component according to another view of the first embodiment of the application.

Fig. 5 is a schematic structural diagram of a third component according to a first embodiment of the present application.

Wherein: 1. a first component; 2. a second component; 3. a third component; 4. a feed structure; 5. opening holes; 6. a distribution structure; 7. an exhaust hole; 8. a liquid distribution hole; 9. a bubble breaking structure; 10. breaking foam holes; 11. a semi-closed end; 12. a first open end; 13. a first component placement hole; 14. a closed end; 15. a second open end.

Detailed Description

The application will be further described with reference to examples:

example 1

As shown in fig. 1 to 5, a distributor with a multi-layer nested structure comprises a first component 1 and a second component 2, wherein the second component is sleeved outside the first component; at least one third component 3 is arranged between the first component and the second component; the first subassembly includes feeding structure 4 and sets up a plurality of trompils 5 on feeding structure, the second subassembly includes distribution structure 6, sets up a plurality of exhaust holes 7 at distribution structure top and sets up a plurality of cloth liquid holes 8 in distribution structure bottom, the third subassembly includes broken bubble structure 9 and is located a plurality of broken bubble holes 10 on the broken bubble structure.

Further, the feeding structure, the distribution structure and the foam breaking structure are hollow structures.

Further, the third component is sleeved on the first component and is located inside the second component, namely, the second component is sleeved on the third component.

Further, the number of the third assemblies is 1, and 1 third group price sleeve is arranged on the first assembly and positioned in the second assembly, namely the second assembly is sleeved on the third assembly.

Further, the number of the third assemblies is at least 2, and the third assemblies are sleeved in sequence from inside to outside.

Further, the feeding structure comprises one or more of a tubular structure, a columnar structure, a conical structure and a truncated cone structure; the feed structure in this embodiment is a cylindrical tubular structure.

Further, the first component is partially located inside the second component, and partially located outside the second component, the end of the portion of the feeding structure located inside the second component is a semi-closed end 11, and the end of the portion of the feeding structure located outside the second component is a first open end 12.

Further, a plurality of the openings are uniformly distributed on the semi-closed end, the openings being for uniformly distributing the high viscosity fluid flowing into the feed structure into the third assembly.

Further, the size of each opening is the same, or the size of each opening gradually increases from the middle part of the semi-closed end to the outside, or the size of each opening gradually decreases from the middle part of the semi-closed end to the outside.

Further, the shape of each of the openings is the same or the shape of each of the openings is different; the shape of the aperture includes, but is not limited to, one of a circular hole shape or a polygonal structure; including but not limited to triangles, quadrilaterals, pentagons, hexagons, pentagons, and stars.

Further, the first open end of the feed structure is in communication with the heat exchanger, and the feed structure is configured to receive the high viscosity fluid exiting the heat exchanger.

Further, the distribution structure comprises one or more of a tubular structure, a columnar structure, a conical structure and a truncated cone structure.

Further, a first component placement hole 13 is formed in the middle of the upper end face of the distribution structure, and the exhaust holes are distributed around the first component placement hole.

Further, the size of the vent holes and the spacing between adjacent vent holes vary with the throughput of the highly viscous fluid.

Further, the first component placement hole is used for inserting the first component.

Further, the liquid distribution holes are uniformly distributed on the lower end face of the distribution structure.

Further, the size of the liquid distribution holes is the same as or slightly larger than that of the foam breaking holes.

Further, the liquid distribution holes are the same in size, or the liquid distribution holes are gradually increased in size from the middle of the lower end face of the distribution structure to the outside.

Further, the lower end face of the distribution structure is provided with a plurality of liquid distribution holes, and the quantity of the liquid distribution holes in each row is the same.

Further, the size of the liquid distribution holes increases with the increase of the viscosity of the high-viscosity fluid, and the diameter range of the liquid distribution holes is 1mm-50mm.

Further, the foam breaking structure comprises one of a columnar structure and a truncated cone-shaped structure.

Further, the first component, the second component and the third component are detachably connected or integrally formed.

Further, the sizes of the plurality of foam breaking holes are the same, or the sizes of the plurality of foam breaking holes are sequentially increased from top to bottom, or the sizes of the plurality of foam breaking holes are sequentially decreased from top to bottom, or the plurality of foam breaking holes are grouped and sequentially arranged.

Further, the shape of the broken cell comprises one of a round hole shape or a polygonal structure; including but not limited to triangles, quadrilaterals, pentagons, hexagons, pentagons, and stars.

Further, the spacing between every two broken cells is the same, or the spacing between the broken cells is increased from top to bottom in sequence, or the spacing between the broken cells is decreased from top to bottom in sequence.

Further, one end of the foam breaking structure, which is close to the liquid distribution hole, is a closed end 14, and one end of the foam breaking structure, which is close to the first component placement hole, is a second open end 15, and the second open end is used for being inserted into the first component.

Further, the plurality of foam breaking holes are uniformly distributed on the side face of the foam breaking structure.

Further, a space is arranged between the broken cell closest to the closed end and the closed end.

Further, the height of the broken cell is d, and the distance between the broken cell closest to the closed end and the closed end is d-10 d, and further 2-5 d.

Further, the height of the semi-closed end of the first component is the same as the height of the bottommost foam breaking hole in the foam breaking structure, or the semi-closed end of the first component is positioned between the closed end of the foam breaking structure and the bottommost foam breaking hole.

Further, the distance between the foam breaking structure closest to the second component and the second component is 1/3-9/10 of the height of the second component, more preferably 1/2-9/10; most preferably 2/3 to 4/5.

Further, the structural parameters of the broken cells, i.e., the shape and size of the broken cells, are varied according to the viscosity variation of the fluid flowing into the first component.

Further, the size of the foam breaking holes increases with the viscosity of the high-viscosity fluid, and the diameter ranges from 1mm to 50mm.

Further, the diameter of the closed end of the first assembly ranges from: 10mm-1000mm; height range: 5mm-100mm.

Further, the diameter of the bottom of the second assembly is larger than the diameter of the closed end of the first assembly, and the diameter of the bottom of the second assembly is in the range of: 10mm-1000mm; height range: 10mm-200mm.

The application also claims a devolatilization tower comprising a tower body, a distributor with a multi-layer nested structure as described above located inside the tower body and a devolatilization tower internals above which the fluid distributor is located.

Further, the first open end of the feeding structure in the distributor is connected with the tower body and receives the high-viscosity fluid flowing out of the heat exchanger.

In the above description, the principle of breaking foam holes in the distributor is as follows: the high-viscosity fluid flowing out of the heat exchanger enters the devolatilization tower and flows into the first component, and uniformly flows to the third component through the opening in the first component; as the foam breaking holes are uniformly formed in the side surface of the foam breaking structure in the third component, and the bottom of the foam breaking structure is a closed end, the foam breaking structure starts to be piled up at the closed end after high-viscosity fluid flows into the foam breaking structure, and the foam breaking structure is extruded along the foam breaking holes on the side surface of the foam breaking structure after being piled up to a certain height, and gas-liquid two-phase separation occurs in the extrusion process.

In the above, the workflow of the distributor is: after the high-viscosity fluid enters the first component, the high-viscosity fluid is uniformly guided into the third component through the holes in the first component, the high-viscosity fluid starts to be accumulated at the closed end of the third component, is extruded along the foam breaking holes on the side surface of the foam breaking structure after being accumulated to a certain height and is separated into gas phase and liquid phase, and the separated liquid phase flows into the bottom of the distribution structure along the outer side surface of the foam breaking structure and flows out of the distributor under the action of gravity from the liquid distribution holes on the bottom; the separated gas phase is discharged from the distributor through the exhaust holes on the upper end surface of the distribution structure.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The distributor with the multilayer nested structure is characterized by comprising a first component and a second component, wherein the second component is sleeved on the outer side of the first component; at least one third component is arranged between the first component and the second component; the first subassembly includes feeding structure and sets up a plurality of trompils on feeding structure, the second subassembly includes distribution structure, sets up a plurality of exhaust holes at distribution structure top and sets up a plurality of cloth liquid holes in distribution structure bottom, the third subassembly includes broken bubble structure and is located a plurality of broken cells on the broken bubble structure.

2. A distributor having a multi-layered nested structure as claimed in claim 1, wherein: the feeding structure, the distribution structure and the foam breaking structure are hollow structures.

3. A distributor having a multi-layered nested structure as claimed in claim 1, wherein: the third component is sleeved on the first component and is positioned in the second component, namely the second component is sleeved on the third component.

4. A distributor having a multi-layered nested structure as claimed in claim 1, wherein: the first component is partially positioned on the inner side of the second component, the first component is partially positioned on the outer side of the second component, the end part of the feeding structure positioned on the inner side of the second component is a semi-closed end, and the end part of the feeding structure positioned on the outer side of the second component is a first open end.

5. A distributor having a multi-layered nested structure as claimed in claim 4, wherein: a plurality of said openings are uniformly distributed over said semi-closed end, said openings being adapted to uniformly disperse the highly viscous fluid flowing into the feed structure into the third assembly.

6. A distributor having a multi-layered nested structure as claimed in claim 1, wherein: the middle part of the upper end face of the distribution structure is provided with first component placement holes, and the exhaust holes are distributed around the first component placement holes.

7. A distributor having a multi-layered nested structure as defined in claim 6, wherein: the liquid distribution holes are uniformly distributed on the lower end face of the distribution structure.

8. A distributor having a multi-layered nested structure as claimed in claim 1, wherein: the one end that breaks the bubble structure and is close to cloth liquid hole is the blind end, broken bubble structure is close to the one end that the hole was placed to first subassembly is the second open end, the second open end is used for inserting first subassembly.

9. A distributor having a multi-layered nested structure as claimed in claim 8, wherein: the plurality of foam breaking holes are uniformly distributed on the side face of the foam breaking structure.

10. A devolatilizer comprising a tower body, the distributor of claim 1 having a multi-layered nested structure positioned within the tower body, and a devolatilizer internals, the fluid distributor being positioned above the devolatilizer internals.