A falling film distributor for high-density falling film evaporator

Abstract

The utility model discloses a falling film distributor for a high-density falling film evaporator, comprising a head and a tube sheet arranged below the head, a plurality of falling film assemblies are arranged on the tube sheet, the upper part of the falling film assembly is arranged in the head, the lower part of the falling film assembly is connected with a heat exchange tube, a distribution plate is arranged in the head, the distribution plate is arranged above the falling film assembly, a liquid inlet pipe is arranged on the head, the liquid outlet of the liquid inlet pipe is arranged above the middle of the distribution plate, the distribution plate comprises a bottom plate, a retaining ring is connected at the edge of the bottom plate, a plurality of liquid drop holes are arranged on the bottom plate, and the projection of the liquid drop holes in the vertical direction has no overlapping part with the projection of the falling film assembly in the vertical direction. The utility model adds a distribution plate to evenly distribute the feed liquid to the surroundings of each falling film assembly, thereby avoiding the difference in liquid level height above the tube sheet and achieving uniformity of falling film distribution.

Description

Technical Field

[0001] The utility model belongs to the technical field of falling film evaporators, and in particular relates to a falling film distributor for a high-density falling film evaporator. Background Art

[0002] SiC falling film evaporator has the advantages of good corrosion resistance, no hydraulic influence, no overheating effect, and high heat transfer efficiency, and is widely used in the chemical industry. However, conventional falling film evaporators are mostly peripheral feed, and when the heat exchange tube distribution density is high, it will cause the liquid level above the tube sheet to be inconsistent, affecting the distribution effect of the falling film component. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the technical solution adopted by the utility model is: a falling film distributor for a high-density falling film evaporator, comprising a head and a tube plate arranged below the head, a plurality of falling film assemblies are penetrated on the tube plate, the upper part of the falling film assembly is arranged in the head, the lower part of the falling film assembly is connected with a heat exchange tube, a distribution plate is arranged in the head, the distribution plate is arranged above the falling film assembly, a liquid inlet pipe is penetrated on the head, a liquid outlet of the liquid inlet pipe is arranged above the middle of the distribution plate, the distribution plate comprises a bottom plate, a retaining ring is connected at the edge of the bottom plate, a plurality of liquid drop holes are arranged on the bottom plate, and the projection of the liquid drop holes in the vertical direction has no overlapping part with the projection of the falling film assembly in the vertical direction.

[0005] The bottom plate is circular.

[0006] A gap is arranged between the outer wall of the retaining ring and the inner wall of the sealing head.

[0007] A plurality of legs are connected to the bottom of the base plate, and the legs are connected to the tube plate.

[0008] Compared with the prior art, the utility model has the following beneficial effects: the utility model adds a distribution plate to evenly distribute the feed liquid to the surroundings of each falling film assembly, thereby avoiding the difference in liquid level height above the tube sheet and achieving uniform distribution of the falling film. In the utility model, the liquid enters the surroundings of the falling film assembly through the liquid drop holes of the distributor, which can solve the problem that when the density of the heat exchange tube is high, the flow channel is narrow, and the feeding around causes large differences in the liquid level above the tube sheet. There is a gap around the distributor and the head, which can be used as a feed gas channel to ensure the stability of the operation. The distributor is fixed to the tube sheet, which can ensure the stability of the position of the distributor and the tube sheet, ensure the consistency of the position of the liquid drop holes and the falling film assembly, and thus ensure the stability of the liquid level height above the tube sheet. The liquid enters the distributor through the liquid inlet pipe, and a semi-open pipe or a porous pipe is set at the outlet of the liquid inlet pipe, which can reduce the impact on the liquid level of the distributor and improve the uniformity of the flow of each liquid drop port, thereby ensuring the consistency of the liquid level around each falling film assembly and improving the falling film distribution effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 It is a structural diagram of the distribution disk. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0012] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0013] See also Figure 1-2A falling film distributor for a high-density falling film evaporator comprises a head 1 and a tube sheet 2 arranged below the head 1, a plurality of falling film assemblies 3 are arranged on the tube sheet 2, the upper part of the falling film assembly 3 is arranged in the head 1, the lower part of the falling film assembly 3 is connected to a heat exchange tube, a distribution plate 4 is arranged in the head 1, the distribution plate 4 is arranged above the falling film assembly 3, a liquid inlet pipe 5 is arranged on the head 1, the liquid outlet of the liquid inlet pipe 5 is arranged above the middle of the distribution plate 4, the liquid enters the distributor through the liquid inlet pipe, and a semi-open pipe or a porous pipe is arranged at the outlet end of the liquid inlet pipe to ensure the stability of the liquid outlet. The distribution plate 4 comprises a bottom plate 402, a retaining ring 403 is connected to the edge of the bottom plate 402, and a plurality of liquid drop holes 404 are arranged on the bottom plate 402, and the retaining ring is used to maintain the liquid height above the bottom plate to ensure the uniformity of the flow of each liquid drop hole. The projection of the downcomer hole 404 in the vertical direction has no overlapping part with the projection of the falling film assembly 3 in the vertical direction, so the downcomer hole of the distributor and the falling film assembly are staggered, and the liquid is evenly distributed between the falling film assemblies through the downcomer hole of the distribution plate, and then enters each heat exchange tube through the falling film assembly.

[0014] The bottom plate 402 is circular.

[0015] A gap is provided between the outer wall of the retaining ring 403 and the inner wall of the sealing head 1, so that gas entrained in the incoming liquid or a small amount of gas generated during the process can pass through, thereby ensuring the stability of the operation process.

[0016] The bottom of the bottom plate 402 is connected to a plurality of legs 401 , and the legs 401 are connected to the tube sheet 2 , thereby ensuring that the relative position of the distribution plate and the tube sheet is stable.

[0017] In the utility model, the liquid enters the surroundings of the falling film assembly through the liquid-dropping holes of the distributor, which can solve the problem that when the density of the heat exchange tube is high, the flow channel is narrow, and the feeding from all sides causes large differences in the liquid level above the tube sheet. There is a gap around the distributor and the head, which can be used as a feed gas channel to ensure the stability of the operation. The distributor is fixed to the tube sheet, which can ensure the stability of the position of the distributor and the tube sheet, ensure the consistency of the position of the liquid-dropping holes and the falling film assembly, and thus ensure the stability of the liquid level height above the tube sheet. The liquid enters the distributor through the liquid inlet pipe, and a semi-open pipe or a porous pipe is set at the outlet of the liquid inlet pipe, which can reduce the impact on the liquid surface of the distributor and improve the uniformity of the flow of each liquid-dropping port, thereby ensuring the consistency of the liquid level around each falling film assembly and improving the falling film distribution effect.

Claims

1. A falling film distributor for a high-density falling film evaporator, comprising a head (1) and a tube sheet (2) arranged below the head (1), a plurality of falling film assemblies (3) are arranged on the tube sheet (2), the upper part of the falling film assembly (3) is arranged in the head (1), and the lower part of the falling film assembly (3) is connected to a heat exchange tube, characterized in that: A distribution plate (4) is arranged in the sealing head (1), and the distribution plate (4) is arranged above the falling film assembly (3). A liquid inlet pipe (5) is passed through the sealing head (1), and the liquid outlet of the liquid inlet pipe (5) is arranged above the middle of the distribution plate (4). The distribution plate (4) comprises a bottom plate (402), and a retaining ring (403) is connected at the edge of the bottom plate (402). A plurality of liquid drop holes (404) are arranged on the bottom plate (402), and the projection of the liquid drop holes (404) in the vertical direction has no overlapping part with the projection of the falling film assembly (3) in the vertical direction.

2. The falling film distributor for a high-density falling film evaporator according to claim 1, characterized in that: The bottom plate (402) is circular, and a gap is provided between the circumferential wall of the bottom plate (402) and the inner wall of the head (1).

3. The falling film distributor for a high-density falling film evaporator according to claim 1, characterized in that: A plurality of legs (401) are connected to the bottom of the base plate (402), and the legs (401) are connected to the tube plate (2).

4. The falling film distributor for a high-density falling film evaporator according to claim 1, characterized in that: A gap is provided between the outer wall of the retaining ring (403) and the inner wall of the sealing head (1).

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