CN116351081A - Multi-branch distributor with double-layer nested structure and devolatilizing tower - Google Patents

Abstract

The invention discloses a multi-branch distributor with a double-layer nested structure and a devolatilizing tower, comprising a first component and a second component, wherein the first component comprises a main road and a plurality of branches, and the second component is sleeved on the outer side of each branch of the first component; each branch road on the first subassembly all includes feeding structure and sets up a plurality of broken cells on feeding structure, the second subassembly includes stock solution structure, sets up a plurality of exhaust holes at stock solution structure top and sets up a plurality of cloth liquid holes in stock solution structure bottom. According to the invention, the distributor is designed into a double-layer nested structure, the inner-layer feeding structure is provided with the broken cells, the gas phase and the liquid phase of the fluid are separated through the broken cells, and then the fluid is distributed through the liquid distribution holes, so that the gas-liquid separation effect is good, the high-viscosity fluid can stably flow out to form a uniform and complete falling film under various process conditions, the devolatilization efficiency is improved, and the product quality is ensured to be uniform.

Description

Multi-branch distributor with double-layer nested structure and devolatilizing tower

Technical Field

The invention relates to the technical field of devolatilization towers, in particular to a multi-branch distributor with a double-layer 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. In addition, the high-viscosity fluid is directly distributed through the distribution plate by a single pipe, and is influenced by wall effect, the flow rate of the holes at the edge is slightly smaller than that of the holes in the middle, and the fluid is unevenly distributed; in the devolatilization process, the fluid needs to flow layer by layer, and the distribution uniformity of the fluid is poorer when the number of layers is larger, so that the devolatilization effect is affected.

Therefore, in order to solve the above problems, it is necessary for those skilled in the art to design a multi-branch distributor and devolatilization tower having a double-layered nested structure, which has a wide viscosity range, can reduce flow resistance and film thickness, and increase surface renewal of a liquid film, thereby enhancing mass and heat transfer properties, ensuring devolatilization quality of fluid, and improving devolatilization efficiency.

Disclosure of Invention

The invention aims to provide a multi-branch distributor with a double-layer nested structure and a devolatilization tower, 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.

The multi-branch distributor with the double-layer nested structure comprises a first component and a second component, wherein the first component comprises a main branch and a plurality of branches, and the second component is sleeved on the outer side of each branch of the first component; each branch road on the first subassembly all includes feeding structure and sets up a plurality of broken cells on feeding structure, the second subassembly includes stock solution structure, sets up a plurality of exhaust holes at stock solution structure top and sets up a plurality of cloth liquid holes in stock solution structure bottom.

Preferably, the main road is provided with n branches; n is a natural number; each branch is connected with at least one branch, and n branches are stacked layer by layer from top to bottom and are communicated through the branches.

Preferably, each of the branches is connected with 2 branches.

Preferably, the number of the branches gradually increases from top to bottom.

Preferably, the number of the branches increases from top to bottom in equal proportion.

Preferably, the turnout and the branch are detachably connected, welded or integrally formed.

Preferably, the detachable connection mode between the turnout and the branch comprises one or two of a buckle connection and a bolt connection.

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

Preferably, the feeding structure and the liquid storage structure are hollow structures; the lowest layer of branches are in one-to-one correspondence and communicated with the branches.

Preferably, the end of the feeding structure located on the inner side of the second component is a closed end, and the end of the feeding structure located on the outer side of the second component is an open end.

Preferably, one end of the main path, which is far away from the branch path, is a feed inlet; the feed inlet is in communication with the heat exchanger, and the feed structure is configured to receive the high viscosity fluid exiting the heat exchanger.

Preferably, a plurality of the broken cells are uniformly distributed on the side of the feed structure near the closed end.

Preferably, the side of the feeding structure located at the structure in the second component is provided with a plurality of broken cells.

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, 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 liquid storage structure comprises one or more of a tubular structure, a columnar structure, a conical structure and a truncated cone structure.

Preferably, the middle part of the upper end face of the liquid storage structure is provided with first component placement holes, and the exhaust holes are uniformly distributed around the first component placement holes.

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, and the depth of the first component insertion is 1/3-9/10 of the height of the liquid storage structure, more preferably 1/2-9/10; most preferably 2/3 to 4/5.

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

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 liquid distribution holes are uniformly distributed on the lower end surface of the liquid storage 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 face of the liquid storage structure to the outer side.

Preferably, the lower end face of the liquid storage 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 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 lower end face of the liquid storage structure is a plane or an arc face, and when the lower end face of the liquid storage structure is an arc face, the depth of the lower end face of the liquid storage structure gradually decreases from the middle part to the periphery.

The application also claims a devolatilization tower comprising a tower body, a multi-branch distributor with a double-layer nested structure as described above located inside the tower body and a devolatilization tower inner member, wherein the fluid distributor is located above the devolatilization tower inner member.

Preferably, the 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, the high-viscosity fluid uniformly flows into each branch along the branches from top to bottom on the main road of the first component, and flows into the branches from the branches, and as the broken cells are uniformly opened on the side surface of the feeding structure and the bottom of the feeding structure is a closed end, the high-viscosity fluid starts to accumulate at the closed end after flowing into the feeding structure, is extruded out along the broken cells on the side surface of the feeding structure after accumulating to a certain height, and gas-liquid two-phase separation occurs in the extrusion process.

In the above, the workflow of the distributor is: the high-viscosity fluid starts to be accumulated at the closed end after entering the inside, is extruded along broken foam holes on the side surface of the feeding structure to be discharged and separated into gas phase and liquid phase after being accumulated to a certain height, and the separated liquid phase flows into the bottom of the liquid storage structure along the outer side surface of the feeding structure and flows out of the distributor under the action of gravity through the liquid distribution holes on the bottom; the separated gas phase is discharged from the distributor on the upper end surface of the liquid storage structure.

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

1. compared with the traditional distributor, the distributor is designed into a double-layer nested structure, the inner-layer feeding structure is provided with the broken cells, the gas phase and the liquid phase of fluid are separated through the broken cells, and then the fluid is distributed through the liquid distribution holes, 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 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.

3. According to the invention, the plurality of bifurcation ports and the branches are arranged on the main path, so that the flow of the high-viscosity fluid flowing into each feeding structure can be kept consistent, and the falling strips are distributed more uniformly; avoiding the uneven distribution of fluid from affecting the devolatilization effect.

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

Drawings

In order to more clearly illustrate the embodiments of the present invention 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 invention, 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 invention.

Fig. 2 is a schematic diagram of a connection structure of a lowest level intersection and a branch of a first component according to a first embodiment of the present invention.

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

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

Fig. 5 is a schematic structural diagram of a second component in the second embodiment of the present invention.

Wherein: 1. a first component; 2. a second component; 3. a feed structure; 4. breaking foam holes; 5. a liquid storage structure; 6. an exhaust hole; 7. a liquid distribution hole; 8. a first component placement hole; 9. a closed end; 10. an open end; 11. a main road; 12. a branch; 13. a fork; 14. a branch road; 15. and a feed inlet.

Detailed Description

The invention will be further described with reference to examples:

example 1

As shown in fig. 1-4, a multi-branch distributor with a double-layer nested structure comprises a first component 1 and a second component 2, wherein the first component comprises a main branch 11 and a plurality of branches 12, and the second component is sleeved on the outer side of each branch of the first component; each branch road on the first subassembly all includes feeding structure 3 and sets up a plurality of broken cells 4 on feeding structure, the second subassembly includes stock solution structure 5, sets up a plurality of exhaust holes 6 at stock solution structure top and sets up a plurality of cloth liquid holes 7 in stock solution structure bottom.

Further, n bifurcation ports 13 are arranged on the main road; n is a natural number; each branch is connected with at least one branch 14, and n branches are stacked layer by layer from top to bottom and are communicated through the branches.

Further, each of the branch points is connected with 2 branch points.

Further, the number of the bifurcation is gradually increased from top to bottom.

Further, the number of the branches increases from top to bottom in an equal ratio.

Further, the turnout and the branch are detachably connected, welded or integrally formed.

Preferably, the detachable connection mode between the turnout and the branch comprises one or two of a buckle connection and a bolt connection.

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

Further, the feeding structure and the liquid storage structure are hollow structures; the lowest layer of branches are in one-to-one correspondence and communicated with the branches.

Further, the end of the feeding structure located on the inner side of the second component is a closed end 9, and the end of the feeding structure located on the outer side of the second component is an open end 10.

Further, one end of the main road, which is far away from the branch road, is a feed inlet; the feed inlet 15 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 plurality of broken cells are uniformly distributed on the side surface, close to the closed end, of the feeding structure.

Further, the side surface of the feeding structure, which is positioned at the structure position in the second component, is provided with a plurality of broken holes.

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, 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 liquid storage structure comprises one or more of a tubular structure, a columnar structure, a conical structure and a truncated cone structure.

Further, the middle part of the upper end face of the liquid storage structure is provided with first component placement holes 8, and the exhaust holes are uniformly distributed around the first component placement holes.

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, and the depth of the first component insertion is 1/3-9/10 of the height of the liquid storage structure, and more preferably 1/2-9/10; most preferably 2/3 to 4/5.

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

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 liquid distribution holes are uniformly distributed on the lower end face of the liquid storage 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 liquid storage structure to the outer side.

Further, the lower end face of the liquid storage 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 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.

Further, the lower end face of the liquid storage structure is a plane.

Example two

The present embodiment is performed based on the first embodiment, and the same points as the first embodiment are not repeated.

In this embodiment, as shown in fig. 5, the lower end surface of the liquid storage structure is an arc surface; the depth of the lower end face of the liquid storage structure gradually decreases from the middle part to the periphery.

Example III

The present embodiment is performed based on the first or second embodiment, and the same points as the above embodiment are not repeated.

The embodiment relates to a devolatilization tower, comprising a tower body, a distributor with a double-layer nested structure and a devolatilization tower inner member, wherein the distributor is positioned in the tower body and is provided with a double-layer nested structure as in the first embodiment or the second embodiment, and the fluid distributor is positioned above the devolatilization tower inner member.

Further, the 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, the high-viscosity fluid uniformly flows into each branch along the branches from top to bottom on the main road of the first component, and flows into the branches from the branches, and as the broken cells are uniformly opened on the side surface of the feeding structure and the bottom of the feeding structure is a closed end, the high-viscosity fluid starts to accumulate at the closed end after flowing into the feeding structure, is extruded out along the broken cells on the side surface of the feeding structure after accumulating to a certain height, and gas-liquid two-phase separation occurs in the extrusion process.

In the above, the workflow of the distributor is: the high-viscosity fluid starts to be accumulated at the closed end after entering the inside, is extruded along broken foam holes on the side surface of the feeding structure to be discharged and separated into gas phase and liquid phase after being accumulated to a certain height, and the separated liquid phase flows into the bottom of the liquid storage structure along the outer side surface of the feeding structure and flows out of the distributor under the action of gravity through the liquid distribution holes on the bottom; the separated gas phase is discharged from the distributor on the upper end surface of the liquid storage structure.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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 (11)

1. The distributor with the double-layer nested structure is characterized by comprising a first component and a second component, wherein the first component comprises a main path and a plurality of branches, and the second component is sleeved on the outer side of each branch of the first component; each branch road on the first subassembly all includes feeding structure and sets up a plurality of broken cells on feeding structure, the second subassembly includes stock solution structure, sets up a plurality of exhaust holes at stock solution structure top and sets up a plurality of cloth liquid holes in stock solution structure bottom.

2. A multi-branch distributor having a double nested structure as claimed in claim 1, wherein: the main road is provided with n bifurcation ports; n is a natural number; each branch is connected with at least one branch, and n branches are stacked layer by layer from top to bottom and are communicated through the branches; the feeding structure comprises one or more of a tubular structure, a columnar structure, a conical structure and a truncated cone structure.

3. A multi-branch distributor having a double nested structure as claimed in claim 2, wherein: the feeding structure and the liquid storage structure are hollow structures; the lowest layer of branches are in one-to-one correspondence and communicated with the branches.

4. A multi-branch distributor having a double nested structure as claimed in claim 1, wherein: the end of the feeding structure, which is positioned at the inner side of the second component, is a closed end, and the end of the feeding structure, which is positioned at the outer side of the second component, is an open end.

5. A multi-branch distributor having a double nested structure as defined in claim 4, wherein: the plurality of broken cells are uniformly distributed on the side surface, close to the closed end, of the feeding structure.

6. A multi-branch distributor having a double nested structure as claimed in claim 1, wherein: and a space is arranged between the broken cell closest to the closed end and the closed end.

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

8. A multi-branch distributor having a double nested structure as claimed in claim 1, wherein: the liquid distribution holes are distributed on the lower end face of the liquid storage structure.

9. A multi-branch distributor having a double nested structure as defined in claim 8, wherein: the lower terminal surface of stock solution structure is plane or arcwall face, when the lower terminal surface of stock solution structure is the arcwall face, the degree of depth of stock solution structure lower terminal surface reduces gradually from the middle part to all around.

10. A multi-branch distributor having a double nested structure as claimed in claim 1, wherein: 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.

11. A devolatilization tower comprising a tower body, a multi-branch distributor having a double nested structure as defined in claim 1 and positioned within the tower body, and a devolatilization tower internals, said fluid distributor being positioned above said devolatilization tower internals.

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