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

Abstract

The application discloses a multi-branch distributor with a double-layer nested structure and a devolatilization tower, which comprises a first component and a second component, the first component comprises a main branch and a plurality of branch paths, and the second component is arranged outside each branch path of the first component; each branch path of the first component comprises a feeding structure and a plurality of bubble breaking holes arranged on the feeding structure, and the second component comprises a liquid storage structure, a plurality of exhaust holes arranged on the top of the liquid storage structure and a plurality of liquid distribution holes arranged on the bottom of the liquid storage structure. The distributor is designed as a double-layer nested structure, the inner layer feeding structure is provided with bubble breaking holes, the fluid is separated into gas phase and liquid phase through the bubble breaking holes, and then the liquid is distributed through the liquid distribution holes, so that the gas-liquid separation effect is good, the high-viscosity fluid can be stably discharged to form a uniform and complete falling film under various process conditions, the devolatilization efficiency is improved, and the product quality is uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of devolatilization tower, in particular to a multi-branch distributor with double-layer nested structure and a devolatilization tower. BACKGROUND

[0002] In the prior art, devolatilization is an important link in chemical production, which is to transfer volatile substances from liquid phase to gas phase to discharge from the fluid. The devolatilization effect directly affects the quality and application field of the product, and its importance is only second to the polymerization reaction process and the process formula.

[0003] At present, various devolatilization equipment has been applied in industrial field. Although the dynamic rotating devolatilization equipment represented by screw extruder and disc ring polycondensation reactor has the advantages of strengthening surface renewal and uniform mixing of materials by means of rotating stirring elements, the structure is too complex, and the manufacturing and operating costs are high. The distributor refers to the liquid distribution device arranged at the top of the packed tower; its function is to uniformly distribute the liquid on the cross section of the tower, so as to ensure high efficiency operation; the distributor in the prior art is mostly single-layer structure with a plurality of liquid distribution holes. The high-viscosity fluid directly flows out from the liquid distribution hole after entering the distributor, and the gas phase and liquid phase in the fluid cannot be separated, and the fluid flow is unstable and even intermittent. When the fluid passing through the distributor flows outside the pipe or in the smooth straight plate type devolatilization tower, the solution viscosity is large, the falling film time is long, and there is a condition that part of the fluid is not devolatilized or the devolatilization effect is poor. The falling film time is uncontrollable, the devolatilization efficiency is low, and the product quality is uneven. If the devolatilization efficiency and quality are to be ensured, the fluid must be re-mixed and devolatilized multiple times, which is costly and inefficient.

[0004] In view of this, Chinese patent CN211836346U discloses a distributor and an evaporator with the same. The distributor includes a distributor body with a feeding cavity, the distributor body is provided with a feeding port communicating with the feeding cavity, and a plurality of evenly distributed liquid distribution holes are arranged on the distributor body, all the liquid distribution holes communicate with the feeding cavity; and the feeding port and the liquid distribution holes are located on two connected surfaces respectively. The evaporator includes an evaporator shell with a gas phase outlet and a material outlet, and the evaporator shell is provided with the distributor. However, it still cannot separate the gas phase and the liquid phase, and the fluid passing through the distributor flows on the tower plate with large static friction and large flow resistance, and the fluid is difficult to be distributed on the tower plate, the membrane layer is thick, and it is not easy to fall film, so the devolatilization effect is poor. In addition, the high-viscosity fluid directly passes through the distribution disc through a single pipe, and the flow rate of the edge hole is slightly smaller than that of the middle hole due to the influence of the wall effect, and the fluid distribution is uneven; during the devolatilization process, the fluid needs to flow through multiple layers, and the more the layers, the worse the fluid distribution uniformity, which affects the devolatilization effect.

[0005] Therefore, it is necessary for the person skilled in the art to design a multi-branch distributor with a double-layer nested structure and a devolatilization tower to solve the above problems, process a wide viscosity range, reduce flow resistance and film thickness, increase liquid film surface renewal, thereby strengthening mass transfer and heat transfer performance, ensure the devolatilization quality of the fluid, and improve the devolatilization efficiency. SUMMARY

[0006] The purpose of the present application is to provide a multi-branch distributor with a double-layer nested structure and a devolatilization tower, which effectively separates the gas phase from the fluid flowing out of the heat exchanger and ensures that the high-viscosity fluid can stably flow out under various process conditions, thereby strengthening the devolatilization effect.

[0007] A multi-branch distributor with a double-layer nested structure comprises a first component and a second component, the first component comprises a main branch and a plurality of branch branches, and the second component is arranged outside each branch of the first component; each branch of the first component comprises a feeding structure and a plurality of bubble breaking holes arranged on the feeding structure, and the second component comprises a liquid storage structure, a plurality of exhaust holes arranged at the top of the liquid storage structure, and a plurality of liquid distribution holes arranged at the bottom of the liquid storage structure.

[0008] Preferably, the main branch is provided with n branch openings; n is a natural number; at least one branch is connected to each branch opening, and the n branch openings are stacked from top to bottom and connected through the branches.

[0009] Preferably, each branch opening is connected to two branches.

[0010] Preferably, the number of branch openings gradually increases from top to bottom.

[0011] Preferably, the number of branch openings increases at equal ratios from top to bottom.

[0012] Preferably, the branches and the branch branches are detachably connected, welded, or integrally formed.

[0013] Preferably, the detachable connection between the branches and the branch branches includes one of buckle connection, bolt connection, or a combination of the two.

[0014] Preferably, the feeding structure comprises one or a combination of tubular structure, columnar structure, conical structure, and circular truncated cone structure.

[0015] Preferably, the feeding structure and the liquid storage structure are hollow structures; the lowest branch is in one-to-one correspondence with the branch and is in communication.

[0016] Preferably, the end of the feeding structure located inside the second component is a closed end, and the end of the feeding structure located outside the second component is an open end.

[0017] Preferably, one end of the main road away from the branch road is a feed port; the feed port is connected to the heat exchanger, and the feed structure is used to receive the high-viscosity fluid flowing out of the heat exchanger.

[0018] Preferably, a plurality of the bubble-breaking holes are evenly distributed on the side surface of the feeding structure close to the closed end.

[0019] Preferably, a plurality of bubble-breaking holes are provided on the side of the feeding structure located in the second component.

[0020] Preferably, the sizes of the plurality of bubble-breaking holes are the same, or the sizes of the plurality of bubble-breaking holes increase from top to bottom, or the sizes of the plurality of bubble-breaking holes decrease from top to bottom, or the plurality of bubble-breaking holes are grouped and arranged in sequence.

[0021] Preferably, the shape of the bubble-breaking pores includes a circular hole shape or a polygonal structure; the polygon includes but is not limited to a triangle, a quadrilateral, a pentagon, a hexagon, and a five-pointed star.

[0022] Preferably, the spacing between each of the bubble-breaking holes is the same, or the spacing between the bubble-breaking holes increases from top to bottom, or the spacing between the bubble-breaking holes decreases from top to bottom.

[0023] Preferably, a distance is provided between the bubble-breaking hole closest to the closed end and the closed end.

[0024] Preferably, the height of the bubble-breaking hole is d, and the distance between the bubble-breaking hole closest to the closed end and the closed end is d to 10d, more preferably 2d to 5d.

[0025] Preferably, the liquid storage structure includes a combination of one or more of a tubular structure, a columnar structure, a conical structure, and a truncated cone structure.

[0026] Preferably, a first component placement hole is provided in the middle of the upper end surface of the liquid storage structure, and the exhaust holes are evenly distributed around the first component placement hole.

[0027] Preferably, the size of the exhaust holes and the spacing between adjacent exhaust holes vary with the processing volume of the high-viscosity fluid.

[0028] Preferably, the first component placement hole is used to insert the first component, and the insertion depth of the first component is 1 / 3 to 9 / 10 of the height of the liquid storage structure, more preferably 1 / 2 to 9 / 10; most preferably 2 / 3 to 4 / 5.

[0029] Preferably, the first component and the second component are detachably connected or integrally formed.

[0030] Preferably, the size of the liquid distribution hole increases with the viscosity of the high-viscosity fluid, and the diameter of the liquid distribution hole ranges from 1 mm to 50 mm.

[0031] Preferably, the plurality of liquid distribution holes are evenly distributed on the lower end surface of the liquid storage structure.

[0032] Preferably, the size of the liquid distribution hole is the same as or slightly larger than the size of the bubble breaking hole.

[0033] Preferably, the sizes of the plurality of liquid distribution holes are the same, or the sizes of the plurality of liquid distribution holes gradually increase from the middle of the lower end surface of the liquid storage structure to the outside.

[0034] Preferably, the lower end surface of the liquid storage structure is provided with a plurality of rows of liquid distribution holes, and the number of liquid distribution holes in each row is the same.

[0035] Preferably, the structural parameters of the bubble-breaking holes, that is, the shape and size of the bubble-breaking holes, change according to the viscosity of the fluid flowing into the first component.

[0036] Preferably, the size of the bubble-breaking holes increases with the viscosity of the high-viscosity fluid, and the diameter ranges from 1 mm to 50 mm.

[0037] Preferably, the diameter range of the closed end of the first component is 10mm-1000mm; the height range is 5mm-100mm.

[0038] Preferably, the bottom diameter of the second component is larger than the diameter of the closed end of the first component, and the bottom diameter range of the second component is: 10mm-1000mm; the height range is: 10mm-200mm.

[0039] Preferably, the lower end surface of the liquid storage structure is a plane or an arc-shaped surface. When the lower end surface of the liquid storage structure is an arc-shaped surface, the depth of the lower end surface of the liquid storage structure gradually decreases from the middle to the surrounding areas.

[0040] The present application also claims protection for a devolatilizer, comprising a tower body, a multi-branch distributor with a double-layer nested structure as described above located inside the tower body, and devolatilizer internals, wherein the fluid distributor is located above the devolatilizer internals.

[0041] Preferably, the open end of the feed structure in the distributor is connected to the tower body and receives the high-viscosity fluid flowing out of the heat exchanger.

[0042] The defoaming principle of the defoaming 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 flows into each branch from the top to the bottom along the branch opening of the first component and then flows into the branch from the branch opening. Since the side surface of the feed structure is uniformly provided with the defoaming holes and the bottom of the feed structure is a closed end, the high-viscosity fluid starts to accumulate at the closed end after flowing into the feed structure. When the accumulated height reaches a certain value, the high-viscosity fluid is extruded out along the defoaming holes on the side surface of the feed structure and separated into gas phase and liquid phase.

[0043] The working process of the distributor is as follows: the high-viscosity fluid starts to accumulate at the closed end after flowing into the feed structure. When the accumulated height reaches a certain value, the high-viscosity fluid is extruded out along the defoaming holes on the side surface of the feed structure and separated into gas phase and liquid phase. The separated liquid phase flows into the bottom of the liquid storage structure along the outside surface of the feed structure and then flows out of the distributor from the liquid distribution holes in the bottom under the action of gravity. The separated gas phase flows out of the distributor from the upper end surface of the liquid storage structure.

[0044] Thanks to the above technical solution, the present application has the following advantages compared with the prior art:

[0045] 1. Compared with the conventional distributor, the distributor of the present application is designed as a double-layer nested structure. The inner feed structure is provided with defoaming holes. The fluid is separated into gas phase and liquid phase through the defoaming holes and then distributed through the liquid distribution holes. The gas-liquid separation effect is good, which ensures that the high-viscosity fluid can stably flow out under various process conditions and avoids the problem of unstable falling film flow or even discontinuity. The falling film formed on the surface of the falling film element is stable and uniform, which improves the devolatilization efficiency.

[0046] 2. The first component and the defoaming holes distributed thereon, the second component and the exhaust holes, liquid distribution holes and adjustable size and shape distributed thereon of the product of the present application have a wide applicable viscosity range.

[0047] 3. The present application can keep the flow of the high-viscosity fluid flowing into each feed structure consistent and the distribution of the falling strips more uniform by providing multiple branch openings and branch roads on the main road. The influence of uneven fluid distribution on the devolatilization effect is avoided.

[0048] 4. The product of the present application has simple structure, low cost and good commercial significance, and is suitable for popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, some of the drawings in the following description are some embodiments of the present application. Those skilled in the art can also obtain other drawings according to these drawings without creating any inventive effort.

[0050] Figure 1 This is a schematic diagram of the overall structure of embodiment 1 of the present invention.

[0051] Figure 2 This is a schematic diagram of the connection structure between the lowest-level fork and branch of the first component of Example 1 of the present invention.

[0052] Figure 3 This is a structural diagram of the second component in Example 1 of the present invention.

[0053] Figure 4 This is a structural diagram of the second component from another perspective in Example 1 of the present invention.

[0054] Figure 5 This is a schematic structural diagram of the second component in the second embodiment of the present invention.

[0055] Among them: 1. First component; 2. Second component; 3. Feed structure; 4. Bubble breaking hole; 5. Liquid storage structure; 6. Exhaust hole; 7. Liquid distribution hole; 8. First component placement hole; 9. Closed end; 10. Open end; 11. Main road; 12. Branch road; 13. Fork; 14. Fork road; 15. Feed port. DETAILED DESCRIPTION

[0056] The present invention will be further described with reference to the following embodiments:

[0057] Example 1

[0058] like Figures 1-4 As shown, a multi-branch distributor with a double-layer nested structure includes a first component 1 and a second component 2, wherein the first components include a main path 11 and a plurality of branches 12, and the second component is sleeved on the outside of the outside of each branch of the first component; each branch on the first component includes a feeding structure 3 and a plurality of bubble breaking holes 4 arranged on the feeding structure, and the second component includes a liquid storage structure 5, a plurality of exhaust holes 6 arranged on the top of the liquid storage structure and a plurality of liquid distribution holes 7 arranged at the bottom of the liquid storage structure.

[0059] Furthermore, n forks 13 are provided on the main road; n is a natural number; each of the forks is connected to at least one fork 14, and the n forks are stacked layer by layer from top to bottom and connected through the forks.

[0060] Furthermore, each of the forks is connected to two forks.

[0061] Furthermore, the number of the bifurcations gradually increases from top to bottom.

[0062] Furthermore, the number of the bifurcations increases proportionally from top to bottom.

[0063] Further, the branch road and the branch are detachably connected, welded or integrally formed.

[0064] Preferably, the detachable connection between the branch road and the branch includes one or a combination of buckle connection and bolt connection.

[0065] Further, the feed structure includes one or a combination of tubular structure, columnar structure, conical structure and circular truncated cone structure.

[0066] Further, the feed structure and the liquid storage structure are both hollow structures; the lowermost branch road corresponds to and communicates with the branch.

[0067] Further, the end of the feed structure inside the second assembly is a closed end 9, and the end of the feed structure outside the second assembly is an open end 10.

[0068] Further, one end of the main road away from the branch is a feed port; the feed port 15 communicates with the heat exchanger, and the feed structure is used to receive high-viscosity fluid flowing out of the heat exchanger.

[0069] Further, a plurality of bubble breaking holes are uniformly distributed on the side of the feed structure close to the closed end.

[0070] Further, a plurality of bubble breaking holes are provided on the side of the structure inside the second assembly.

[0071] Further, the sizes of a plurality of bubble breaking holes are the same, or the sizes of a plurality of bubble breaking holes increase from top to bottom, or the sizes of a plurality of bubble breaking holes decrease from top to bottom, or a plurality of bubble breaking holes are arranged in groups and in order.

[0072] Further, the shape of the bubble breaking hole includes one of a round hole or a polygonal structure; the polygon includes but is not limited to triangle, quadrilateral, pentagon, hexagon and pentagram.

[0073] Further, the spacing between each bubble breaking hole is the same, or the spacing between the bubble breaking holes increases from top to bottom, or the spacing between the bubble breaking holes decreases from top to bottom.

[0074] Further, the bubble breaking hole closest to the closed end is provided with a spacing from the closed end.

[0075] Further, the height of the bubble breaking hole is d, the spacing between the bubble breaking hole closest to the closed end and the closed end is d-10d, and further 2d-5d.

[0076] Further, the liquid storage structure comprises one or more of a tubular structure, a columnar structure, a conical structure, a circular truncated cone structure.

[0077] Further, the middle part of the upper end surface of the liquid storage structure is provided with a first component placement hole 8, and the exhaust holes are uniformly distributed around the first component placement hole.

[0078] Further, the size of the exhaust hole and the spacing between adjacent exhaust holes change with the processing amount of high viscosity fluid.

[0079] Further, the first component placement hole is used to insert the first component, and the insertion depth of the first component is 1 / 3-9 / 10 of the height of the liquid storage structure, more preferably 1 / 2-9 / 10, and most preferably 2 / 3-4 / 5.

[0080] Further, the first component and the second component are detachably connected or integrally formed.

[0081] Further, the size of the liquid distribution hole increases with the increase of the viscosity of the high viscosity fluid, and the diameter of the liquid distribution hole ranges from 1mm to 50mm.

[0082] Further, a plurality of liquid distribution holes are uniformly distributed on the lower end surface of the liquid storage structure.

[0083] Further, the size of the liquid distribution hole is the same as or slightly larger than the size of the bubble breaking hole.

[0084] Further, the sizes of a plurality of liquid distribution holes are the same, or the sizes of a plurality of liquid distribution holes gradually increase from the middle of the lower end surface of the liquid storage structure to the outside.

[0085] Further, the lower end surface of the liquid storage structure is provided with a plurality of liquid distribution holes, and the number of liquid distribution holes in each row is the same.

[0086] Further, the structure parameters of the bubble breaking hole, i.e. the shape and size of the bubble breaking hole, change according to the viscosity of the fluid flowing into the first component.

[0087] Further, the size of the bubble breaking hole increases with the increase of the viscosity of the high viscosity fluid, and the diameter ranges from 1mm to 50mm.

[0088] Further, the diameter of the closed end of the first component ranges from 10mm to 1000mm, and the height ranges from 5mm to 100mm.

[0089] Further, the diameter of the bottom of the second component is greater than the diameter of the closed end of the first component, and the diameter of the bottom of the second component ranges from 10mm to 1000mm, and the height ranges from 10mm to 200mm.

[0090] Further, the lower end surface of the liquid storage structure is a flat surface.

[0091] Embodiment Two

[0092] This embodiment is based on the above-mentioned embodiment one, and the same parts as the above-mentioned embodiment are not described.

[0093] As shown in the figure, in this embodiment, the lower end surface of the liquid storage structure is an arc surface; the depth of the lower end surface of the liquid storage structure gradually decreases from the middle to the periphery. Figure 5

[0094] Embodiment Three

[0095] This embodiment is based on the above-mentioned embodiment one or two, and the same parts as the above-mentioned embodiment are not described.

[0096] This embodiment relates to a devolatilization tower, which comprises a tower body, a fluid distributor with a double-layer nested structure as described in embodiment one or two located inside the tower body, and a devolatilization tower inner component, wherein the fluid distributor is located above the devolatilization tower inner component.

[0097] Further, the open end of the feed structure in the distributor is connected with the tower body and receives the high-viscosity fluid flowing out of the heat exchanger.

[0098] In the above, the defoaming principle of the defoaming 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 from the top to the bottom along the branch opening in the main path of the first component, and then flows into the branch path from the branch, since the side surface of the feed structure is uniformly provided with defoaming holes and the bottom of the feed structure is a closed end, the high-viscosity fluid starts to accumulate at the closed end after flowing into the feed structure, and then is squeezed out along the defoaming holes in the side surface of the feed structure after accumulating to a certain height, and gas-liquid two-phase separation occurs in the process of squeezing.

[0099] In the above, the working process of the distributor is as follows: the high-viscosity fluid starts to accumulate at the closed end after entering the inside, and then is squeezed out along the defoaming holes in the side surface of the feed structure after accumulating to a certain height, and is separated into gas phase and liquid phase, the separated liquid phase flows into the bottom of the liquid storage structure along the outside surface of the feed structure, and then flows out of the distributor from the liquid distribution holes in the bottom under the action of gravity; the separated gas phase flows out of the distributor from the upper end surface of the liquid storage structure.

[0100] ​The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A distributor with a double-layer nested structure, characterized in that: The device comprises a first component and a second component, wherein the first component comprises a main circuit and a plurality of branch circuits, and the second component is sleeved on the outside of each branch circuit of the first component; each branch circuit of the first component comprises a feed structure and a plurality of bubble-breaking holes provided on the feed structure, and the second component comprises a liquid storage structure, a plurality of exhaust holes provided on the top of the liquid storage structure, and a plurality of liquid distribution holes provided on the bottom of the liquid storage structure; The end of the feeding structure located inside the second component is a closed end, and the end of the feeding structure located outside the second component is an open end; A plurality of bubble-breaking holes are evenly distributed on the side surface of the feeding structure close to the closed end.

2. The multi-branch distributor with a double-layer nested structure according to claim 1, characterized in that: There are n forks on the main road; n is a natural number; each of the forks is connected to at least one fork, and the n forks are stacked layer by layer from top to bottom and connected through the forks; the feeding structure includes one or more combinations of tubular structure, columnar structure, conical structure, and frustum structure.

3. The multi-branch distributor with a double-layer nested structure according to claim 2, characterized in that: The feed structure and the liquid storage structure are both hollow structures; the lowest layer of forks correspond to and are connected with the branches one by one.

4. The multi-branch distributor with a double-layer nested structure according to claim 1, characterized in that: A distance is provided between the bubble-breaking hole closest to the closed end and the closed end.

5. The multi-branch distributor with a double-layer nested structure according to claim 1, characterized in that: A first component placement hole is provided in the middle of the upper end surface of the liquid storage structure, and the exhaust holes are distributed around the first component placement hole.

6. The multi-branch distributor with a double-layer nested structure according to claim 1, characterized in that: A plurality of liquid distribution holes are distributed on the lower end surface of the liquid storage structure.

7. A multi-branch distributor with a double-layer nested structure as claimed in claim 6, characterized in that: The lower end surface of the liquid storage structure is a plane or an arc-shaped surface. When the lower end surface of the liquid storage structure is an arc-shaped surface, the depth of the lower end surface of the liquid storage structure gradually decreases from the middle to the surrounding areas.

8. The multi-branch distributor with a double-layer nested structure according to claim 1, characterized in that: The structural parameters of the bubble-breaking holes, that is, the shape and size of the bubble-breaking holes, change according to the viscosity of the fluid flowing into the first component.

9. A devolatilization tower, characterized in that: The invention comprises a tower body, a multi-branch distributor with a double-layer nested structure as claimed in claim 1 located inside the tower body, and a devolatilization tower internal component, wherein the fluid distributor is located above the devolatilization tower internal component.

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