Novel falling film reboiler

Abstract

The utility model relates to a novel falling film reboiler. The falling film reboiler is a vertical type in-pipe falling film type reboiler. A liquid distributor adopted by the falling-film reboiler is a jacket type liquid distributor and comprises an inner jacket, the inner jacket is installed in an upper seal head of the falling-film reboiler and buckled above an upper tube plate of the falling-film reboiler to form an interlayer space, the interlayer space is communicated with a feed liquid inlet of the falling-film reboiler, and a plurality of liquid discharge holes are evenly formed in a bottom ring of the inner jacket along the circumference; the upper end of a heat exchange tube of the falling film reboiler extends out of an upper tube plate of the falling film reboiler by a section; and a film distribution head adopted by the falling film reboiler is an overflow type film distribution head and is arranged at the upper end of a heat exchange tube of the falling film reboiler. The liquid is fully distributed on the upper tube plate of the falling-film reboiler by utilizing the interlayer space, the fluid is stable and free of foam and splashing phenomena in the whole process, the clearance height between the feed liquid inlet of the falling-film reboiler and the upper tube plate can be greatly reduced, and the falling-film reboiler is suitable for large and ultra-large falling-film reboilers.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery grade DMC chemical device, and particularly relates to a novel falling film reboiler. BACKGROUND

[0002] The production capacity and operating performance of the falling film reboiler depend to a great extent on the distribution state of the liquid. Therefore, the liquid distribution device is an important component of the falling film reboiler, and its role is not only to uniformly distribute the liquid to each heat transfer pipe, but also to form a stable and uniform liquid film in the circumferential direction and the length direction of the whole pipe wall.

[0003] The liquid distribution device used in the existing falling film reboiler is a multi-layer spray tray type distributor or a liquid distributor with a spray, and the following problems exist in the use process.

[0004] 1) The clearance height between the liquid inlet and the upper tube plate needs to be increased to ensure that there is sufficient space distance to arrange the multi-layer distribution tray and the spray device, and for a large-diameter reboiler, the weight and cost of the reboiler are inevitably increased;

[0005] 2) As the structure of the distributor becomes more and more complex and the size becomes larger and larger, the weight of the spray device itself is also increased, and the stress under the impact of the material liquid is also increased, and the spray device of the above structure is fixed on the liquid inlet connector, which will cause the increase of the external load of the connector;

[0006] 3) The above large distribution tray requires high precision in manufacturing and installation, and once the levelness is out of tolerance, the uniform distribution of the material liquid cannot be guaranteed, and film formation problems are easily caused, which may reduce the service life of the equipment or even affect the safe operation of the equipment.

[0007] 4) The material liquid of the above distribution tray and spray device falls from top to bottom to the lower layer distribution tray, and the splashing of the liquid cannot be avoided, a cofferdam height of 10 times the liquid height is usually used, a large amount of space in the tube box is occupied, and foam is easily generated, which affects the stable flow of the fluid. SUMMARY

[0008] The utility model provides a novel falling film reboiler which adopts a jacket type liquid distributor supplemented by an overflow type film distribution head, and aims at solving the above problems.

[0009] The technical scheme of the utility model comprises the following steps:

[0010] A new type of falling film reboiler, which is a vertical tube-in falling film reboiler; the liquid distributor used by the falling film reboiler is a jacketed liquid distributor, which comprises an inner jacket, the inner jacket is installed in the upper head of the falling film reboiler and buckled on the upper tube plate of the falling film reboiler to form a jacketed space, the jacketed space is communicated with the feed liquid inlet of the falling film reboiler, and the bottom ring of the inner jacket is provided with a plurality of liquid discharge holes along the circumference.

[0011] The upper end of the heat exchange pipe of the falling film reboiler extends out of the upper tube plate of the falling film reboiler by a section; the film distribution head used by the falling film reboiler is an overflow type film distribution head, which is installed on the upper end of the heat exchange pipe of the falling film reboiler.

[0012] In use, the liquid material enters the jacketed space from the feed liquid inlet of the falling film reboiler, flows down in the jacketed space along the jacketed wall, solves the problem of splashing of the liquid, avoids the generation of foam, guarantees the stable flow of the fluid, flows out from the liquid discharge holes, gradually diffuses and covers the entire upper tube plate of the falling film reboiler, and the liquid level rises to overflow from the upper end of the heat exchange pipe of the falling film reboiler and form a film under the action of the overflow type film distribution head.

[0013] Further improvement is made on the above technical solution, the heat exchange pipe of the falling film reboiler is provided with a plurality of radial channels between the parts extending out of the upper tube plate of the falling film reboiler, and the radial channels meet at the center; in this way, the liquid flowing out from the liquid discharge holes converges at the center along the radial channels (with the smallest resistance), and gradually diffuses in the process of converging at the center along the radial channels, thereby forming stable horizontal flow.

[0014] Further refinement is made on the above technical solution, the inner jacket is fixed on the upper head of the falling film reboiler through a plurality of connecting rods and / or connecting plates, and the connecting rods and / or connecting plates are located in the jacketed space; the connecting rods or connecting plates can to some extent play a role in stabilizing flow and breaking foam; and the connecting rods or connecting plates do not increase the external load of the feed liquid inlet (interface pipe) of the falling film reboiler.

[0015] Further refinement is made on the above technical solution, the side edge of the connecting plate is tooth-shaped; the tooth-shaped design is more conducive to breaking foam.

[0016] The falling film reboiler has the advantages that the design is reasonable, the conception is ingenious, the liquid is distributed to the upper tube plate of the falling film reboiler by using the jacketed space, the fluid is stable, there is no foam and splashing phenomenon in the whole process, which provides a favorable environment for subsequent film formation, and the design can greatly reduce the headroom height between the feed liquid inlet and the upper tube plate of the falling film reboiler, and is suitable for large and super large falling film reboilers. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the local structure of the new falling film reboiler.

[0018] Figure 2 is Figure 1 A-A direction cross-sectional view.

[0019] In the figure, inner jacket 1, upper head 2 of falling film reboiler, upper tube sheet 3 of falling film reboiler, interlayer space 4, feed liquid inlet 5 of falling film reboiler, liquid discharge hole 6, heat exchange tube 7 of falling film reboiler, overflow type film distribution head 8, radial channel 9. DETAILED DESCRIPTION

[0020] As Figures 1-2 shown, a new type of falling film reboiler, the falling film reboiler is a vertical tube falling film reboiler; the liquid distributor used by the falling film reboiler is a jacketed liquid distributor, which includes an inner jacket 1, the inner jacket 1 is installed in the upper head 2 of the falling film reboiler, buckled on the upper tube sheet 3 of the falling film reboiler, forming an interlayer space 4, the interlayer space 4 is connected with the feed liquid inlet 5 of the falling film reboiler, the bottom ring of the inner jacket 1 is provided with a plurality of liquid discharge holes 6 along the circumference; the upper end of the heat exchange tube 7 of the falling film reboiler extends out of the upper tube sheet 3 of the falling film reboiler by a segment; the film distribution head used by the falling film reboiler is an overflow type film distribution head 8, which is installed on the upper end of the heat exchange tube 7 of the falling film reboiler; the heat exchange tube 7 of the falling film reboiler, the part extending out of the upper tube sheet 3 of the falling film reboiler is left with a plurality of radial channels 9, each radial channel 9 converges at the center; the inner jacket 1 is fixed on the upper head 2 of the falling film reboiler through a plurality of connecting rods and connecting plates, each connecting rod and connecting plate is located in the interlayer space 4; the side edge of the connecting plate is toothed.

[0021] The technical elements described in the specification or drawings play a technical usefulness by themselves or in various combinations, and are not limited to the combinations described in the claims at the time of application. Furthermore, the techniques exemplified in the specification or drawings simultaneously achieve multiple purposes, and achieving one of the purposes itself has technical usefulness.

Claims

1. A novel falling film reboiler, which is a vertical tube falling film reboiler; characterized in that: The liquid distributor used in the falling film reboiler is a jacketed liquid distributor, comprising an inner jacket, which is installed in the upper head of the falling film reboiler and buckled above the upper tube plate of the falling film reboiler to form an interlayer space, which is connected to the liquid inlet of the falling film reboiler. The bottom ring of the inner jacket is evenly provided with a plurality of drainage holes along the circumference; The upper end of the heat exchange tube of the falling film reboiler extends out of a section of the upper tube plate of the falling film reboiler; the film cloth head used in the falling film reboiler is an overflow type film cloth head, which is installed at the upper end of the heat exchange tube of the falling film reboiler.

2. A novel falling film reboiler according to claim 1, characterized in that: The heat exchange tubes of the falling film reboiler are arranged such that a plurality of radial channels are left between the portions of the upper tube plate extending out of the falling film reboiler, and the radial channels intersect at the center.

3. The novel falling film reboiler according to claim 1, characterized in that: The inner jacket is fixed to the upper head of the falling film reboiler through a plurality of connecting rods, and each connecting rod and / or connecting plate is located in the interlayer space.

4. A novel falling film reboiler according to claim 1, characterized in that: The inner jacket is fixed to the upper head of the falling film reboiler through a plurality of connecting rods, and each connecting rod is located in the interlayer space.

5. The novel falling film reboiler according to claim 1, characterized in that: The inner jacket is fixed to the upper head of the falling film reboiler through a plurality of connecting plates, and each connecting plate is located in the interlayer space.

6. The novel falling film reboiler according to claim 1, characterized in that: The inner jacket is fixed to the upper head of the falling film reboiler through a plurality of connecting rods and connecting plates, and each connecting rod and connecting plate is located in the interlayer space.

7. A novel falling film reboiler according to claim 5 or 6, characterized in that: The side edge of the connecting plate is tooth-shaped.

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