Sawtooth-shaped distribution head of falling film device

Abstract

The zigzag distribution head of the falling film device comprises a distributor, an upper tube plate and a plurality of heat exchange tubes, the lower end of the distributor is communicated with a liquid outlet tube, a tube opening at the upper end of each heat exchange tube is zigzag, the zigzag distribution head of the falling film device further comprises a baffle arranged between the liquid outlet tube and the heat exchange tubes, and the baffle covers the upper ends of the heat exchange tubes. A baffle is arranged on the upper tube plate, a plurality of water falling holes located between the adjacent heat exchange tubes are formed in the baffle, a plurality of vertical supporting rods are fixedly connected to the lower end of the baffle, and the lower ends of the supporting rods are fixedly connected with the upper tube plate. The whole baffle is supported through the supporting rods, so that liquid inlet of the heat exchange pipe is not affected, liquid can uniformly enter the heat exchange pipe, and the liquid can conveniently flow from top to bottom in a film shape.

Description

Technical Field

[0001] The utility model relates to the technical field of falling film devices, in particular to a sawtooth distribution head of a falling film device. Background Art

[0002] The falling film reactor adds the feed liquid from the upper chamber of the falling film reactor heating chamber, and then distributes it to each heat exchange tube. Under the action of gravity, vacuum induction and airflow, it flows from top to bottom in a film shape. During the flow process, it is heated and vaporized by the shell side heating medium, and the generated steam and liquid phase enter the separation chamber of the evaporator together, achieving full separation of vapor and liquid.

[0003] The upper end of the heat exchange tube is a distribution head, including a distributor and an upper tube plate. The upper end of the heat exchange tube passes through the upper tube plate, and the liquid material falls from the distributor to the upper tube plate, freely overflows from the tube mouth of the heat exchange tube into the tube, and flows down in strands. It cannot evenly fit on the tube wall of the heat exchange tube, and cannot form a uniform film. The contact area between the stream and the heat exchange tube wall is small, so the heat exchange efficiency is low.

[0004] The utility model with announcement number CN206566711U discloses a falling film absorption tower liquid distributor, which blocks the upper end of the heat exchange tube by a baffle cap and allows liquid to enter the heat exchange tube through a serrated notch. The baffle cap is supported by support bars arranged on the outer side of the top end of the heat exchange tube. However, liquid enters the heat exchange tube through the upper end of the heat exchange tube, and the setting of the support bars will affect the uniform entry of liquid into the heat exchange tube. Utility Model Content

[0005] Aiming at the deficiencies of the prior art, the utility model provides a sawtooth distribution head of a falling film device.

[0006] The utility model is realized through the following technical scheme, providing a zigzag distribution head of a falling film device, comprising a distributor, an upper tube plate and a plurality of heat exchange tubes, wherein the lower end of the distributor is connected with a liquid outlet pipe, the upper end of the heat exchange tube is zigzag, and further comprising a baffle plate arranged between the liquid outlet pipe and the heat exchange tube, the baffle plate covers the upper end of the heat exchange tube, the baffle plate is provided with a plurality of water drop holes located between adjacent heat exchange tubes, the lower end of the baffle plate is fixedly connected with a plurality of vertical support rods, and the lower ends of the support rods are fixedly connected to the upper tube plate.

[0007] When the falling film device in this scheme is working, the liquid flows downward from the liquid outlet pipe at the lower end of the distributor to the upper tube plate, and the baffle is used to prevent the liquid from directly entering the heat exchange tube. The liquid accumulates on the upper tube plate. When the liquid level reaches the serrated position of the upper end of the heat exchange tube, it enters the heat exchange tube through the serrated openings at the lower ends of the multiple serrations, so that the liquid enters the heat exchange tube evenly in the circumferential direction. The baffle is made of steel plate with multiple water holes, and is fixed to the upper tube plate by a support rod, so as not to affect the uniformity of the liquid inlet at the upper end of the heat exchange tube.

[0008] As an optimization, the baffle includes a plurality of coplanar circular plates, connecting rods are connected between adjacent circular plates, and water holes are formed between the plurality of adjacent connecting rods. In this solution, the plurality of circular plates are coplanar, so by cutting water holes on the flat plate and retaining connecting rods between adjacent circular plates, the circular plates cover the heat dissipation pipes, and at the same time facilitate the liquid to fall to the upper tube plate.

[0009] As an optimization, the upper end of the support rod is fixedly connected to the connecting rod. In this solution, the upper end of the support rod is fixed on the connecting rod, so as not to affect the liquid inlet of the heat exchange tube.

[0010] As an optimization, the connecting rod is a rod of equal cross-section and has a rectangular cross-section. In this solution, the connecting rod is a rod of equal cross-section, and the cross-sections at each position are the same, so as to increase the area of ​​the water drop hole as much as possible.

[0011] As an optimization, the diameter of the circular plate is 1-1.2 times the outer diameter of the upper end of the heat exchange tube, thereby achieving a good covering and shielding effect.

[0012] As an optimization, the upper end of the heat exchange tube is triangular serrated. Therefore, when the liquid enters the heat exchange tube through the serrated shape, as the liquid level increases, the flow rate entering the heat exchange tube increases evenly.

[0013] As an optimization, the distributor is connected to the upper tube plate through connecting bolts, and a supporting sleeve is sleeved on the connecting bolts. The distributor is fixed by the connecting bolts, and the distributor is elevated by the supporting sleeve.

[0014] The beneficial effects of the utility model are as follows: a serrated distribution head of a film descending device of the utility model forms water drop holes by cutting on the entire plate, and forms a circular plate covering the heat exchange tubes between adjacent water drop holes, and supports the entire baffle 3 by a support rod, thereby not affecting the liquid inlet of the heat exchange tubes, so that the heat exchange tubes can be evenly inlet with liquid, which is convenient for the liquid to flow from top to bottom in a film shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0016] Figure 2 For this utility model Figure 1 Enlarged view of part A in the middle;

[0017] Figure 3 It is a top view of the heat exchange tube of the utility model;

[0018] Figure 4 It is a top view of the baffle of the utility model;

[0019] As shown in the figure:

[0020] 1. Upper tube plate, 2. Heat exchange tube, 3. Baffle, 4. Distributor, 5. Liquid outlet pipe, 6. Connecting bolts, 7. Support sleeve, 8. Cylinder, 9. Support rod, 31. Round plate, 32. Drain hole, 33. Connecting rod. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0022] like Figures 1 to 4 As shown, a zigzag distribution head of a falling film device of the utility model comprises a distributor 4, an upper tube sheet 1 and a plurality of heat exchange tubes 2. The lower end of the distributor 4 is connected with a liquid outlet pipe 5. The distributor 4 and the upper tube sheet 1 are both arranged in a cylinder 8. The distributor 4 is located above the upper tube sheet 1. The distributor 4 is a cylindrical structure with an upper opening. The liquid flows downward from the single liquid outlet pipe 5 under the distributor, and the lower end of the liquid outlet pipe 5 is a wedge-shaped head.

[0023] The distributor 4 is connected to the upper tube sheet 1 by connecting bolts 6, and a plurality of connecting bolts 6 are provided. A supporting sleeve 7 is sleeved on the connecting bolts 6. The upper end of the supporting sleeve 7 is pressed against the lower end surface of the distributor 4, and the lower end of the supporting sleeve 7 is pressed against the upper end surface of the upper tube sheet 1.

[0024] The upper end of the heat exchange tube 2 is serrated, specifically, the upper end of the heat exchange tube 2 is triangular serrated. Multiple serrations are evenly distributed along the circumference of the heat exchange tube 2, and the lower ends of all serrations are intermediate ends and have the same height, so that the liquid can enter the heat exchange tube 2 together.

[0025] It also includes a baffle 3 arranged between the liquid outlet pipe 5 and the heat exchange tube 2, the baffle 3 covers the upper end of the heat exchange tube 2, the baffle is arranged horizontally, covers the upper ends of all heat exchange tubes 2, and prevents liquid from directly entering the heat exchange tube 2. A certain distance is left between the lower end surface of the baffle and the upper end of the heat exchange tube 2, generally 1-5 cm.

[0026] The baffle plate 3 is provided with a plurality of water drop holes 32 between adjacent heat exchange tubes 2 . The baffle plate 3 includes a plurality of coplanar circular plates 31 . The diameter of the circular plates 31 is 1-1.2 times the outer diameter of the upper end of the heat exchange tube 2 .

[0027] Connecting rods 33 are connected between adjacent circular plates 31, and a plurality of adjacent connecting rods 33 form a water drop hole 32. The connecting rod 33 is a rod with a uniform cross-section and a rectangular cross-section. In this embodiment, three connecting rods 33 form a water drop hole 32.

[0028] like Figure 4 As shown, the baffle 3 in this embodiment is made of a flat steel plate, and a plurality of water drop holes 32 are cut out to form circular plates 31 between adjacent water drop holes, and connecting rods 33 are retained between adjacent circular plates 31 to connect them as a whole, thereby connecting all circular plates 31 into an integrated structure.

[0029] A plurality of vertical support rods 9 are fixedly connected to the lower end of the baffle plate 3, and the lower end of the support rod 9 is fixedly connected to the upper tube plate 1. In this embodiment, the upper end of the support rod 9 is fixedly connected to the connecting rod 33, so as not to affect the liquid inlet of the heat exchange tube.

[0030] The use of the utility model:

[0031] When the falling film device is working, the liquid flows downward from the liquid outlet pipe 5 at the lower end of the distributor 4 to the upper tube plate 1. The baffle plate prevents the liquid from directly entering the heat exchange tube 2. The liquid accumulates on the upper tube plate 1. When the liquid level reaches the serrated position of the upper end of the heat exchange tube 2, it enters the heat exchange tube through the serrated openings at the lower ends of the multiple serrations, so that the liquid enters the heat exchange tube evenly in the circumferential direction. The baffle plate 3 is made of steel plate, and multiple water holes 32 are processed to form a circular plate 31 covering the upper end of the heat exchange tube 2. It is fixed to the upper tube plate 1 by the support rod 9, so as not to affect the uniformity of the liquid inlet at the upper end of the heat exchange tube 2.

[0032] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A zigzag distribution head for a falling film device, comprising a distributor (4), an upper tube plate (1) and a plurality of heat exchange tubes (2), wherein the lower end of the distributor (4) is connected to a liquid outlet pipe (5), and wherein: The upper end of the heat exchange tube (2) has a serrated tube opening and further comprises a baffle (3) arranged between the liquid outlet pipe (5) and the heat exchange tube (2), the baffle (3) covering the upper end of the heat exchange tube (2), the baffle (3) having a plurality of water drop holes (32) located between adjacent heat exchange tubes (2), the lower end of the baffle (3) being fixedly connected to a plurality of vertical support rods (9), the lower ends of the support rods (9) being fixedly connected to the upper tube plate (1).

2. The sawtooth distribution head of the falling film device according to claim 1, characterized in that: The baffle (3) comprises a plurality of coplanar circular plates (31), connecting rods (33) are connected between adjacent circular plates (31), and water drop holes (32) are formed between the plurality of adjacent connecting rods (33).

3. The sawtooth distribution head of the falling film device according to claim 2, characterized in that: The upper end of the support rod (9) is fixedly connected to the connecting rod (33).

4. The sawtooth distribution head of the falling film device according to claim 2, characterized in that: The connecting rod (33) is a rod with a uniform cross-section and a rectangular cross-section.

5. The sawtooth distribution head of the falling film device according to claim 2, characterized in that: The diameter of the circular plate (31) is 1 to 1.2 times the outer diameter of the upper end of the heat exchange tube (2).

6. A falling film device sawtooth distribution head according to any one of claims 1 to 5, characterized in that: The upper end of the heat exchange tube (2) is in a triangular sawtooth shape.

7. The sawtooth distribution head of a falling film device according to any one of claims 1 to 5, characterized in that: The distributor (4) is connected to the upper tube plate (1) via connecting bolts (6), and a supporting sleeve (7) is sleeved on the connecting bolts (6).

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