Multi-stage uniform liquid distribution device

Abstract

A primary liquid distributor is arranged under a primary liquid distributor, a secondary film distributor is arranged under the primary liquid distributor, a secondary liquid distribution disc is arranged at the bottom of the secondary film distributor, a plurality of secondary liquid distribution holes are uniformly distributed in the secondary liquid distribution disc, and a secondary liquid distribution barrel which is erected upwards is arranged on the periphery of the secondary liquid distribution disc; a tooth-shaped liquid distribution unit is arranged in each second-stage liquid distribution hole in the second-stage liquid distribution disc, the middle of each tooth-shaped liquid distribution unit is fixed in the corresponding second-stage liquid distribution hole, three V-shaped overflow grooves with wide upper parts and narrow lower parts are symmetrically formed in the circumference of the upper part of each tooth-shaped liquid distribution unit, and the bottom of each V-shaped overflow groove is flush with the upper surface of the second-stage liquid distribution disc; three V-shaped drooping parts which extend downwards and are wide at the upper parts and narrow at the lower parts are symmetrically arranged on the circumference of the lower part of each tooth-shaped liquid distribution unit; and each V-shaped drooping part is respectively positioned right below the corresponding V-shaped overflow groove. The pore diameter of each stage of liquid distribution is large, scaling or pipe blocking is not prone to occurring, and the liquid film in the falling film pipe can be evenly distributed.

Description

Technical Field

[0001] This utility model relates to a liquid distribution device, and more particularly to a multi-stage uniform liquid distribution device, belonging to the technical field of falling film liquid distribution equipment. Background Technology

[0002] For the concentration, purification and separation of chemical wastewater, falling film evaporators are frequently used in the market. The liquid film formed on the inner wall of the falling film tube is heated by the shell side during the downward flow, causing the liquid to partially vaporize after reaching its boiling point, thus concentrating the liquid. It is very important to form a liquid film of uniform thickness on the inner wall of the falling film tube.

[0003] In existing conventional falling film evaporators, the uniformity of the liquid film thickness in the falling film tubes in the circumferential direction is poor. To ensure uniform liquid film thickness in the circumferential direction of the falling film tubes, the film distribution effect of the distributor is required. After passing through a specially structured distributor, the fluid in the tube side falls relatively evenly onto the tube bridge of the upper tube sheet. During the downward flow along the falling film tubes, due to deviations in the manufacturing and installation process of the heat exchanger, the non-uniformity of the liquid film in the circumferential direction in the falling film tubes may be amplified, affecting the heat transfer effect. Furthermore, when the deviation of the liquid film in the falling film tubes reaches a certain level, the liquid film thickness may decrease to zero on one side, leading to dry tubes in some areas of the falling film tubes, scaling, and further blockage of the falling film tubes.

[0004] Traditional falling film evaporators employ a porous structure for their distribution plate, with the number of holes typically being 1.1 to 1.5 times the number of falling film tubes. Furthermore, they generally use a preliminary distributor plus a single-stage film distributor structure. To ensure uniform liquid distribution, it's difficult to reduce the number of distribution holes, resulting in relatively small hole diameters. During the concentration process of inorganic salt solutions or other solutions containing solids, scale easily forms on the distribution plate surface. When the scale reaches a certain thickness, it forms bridging blocks of the distribution holes, ultimately clogging the falling film tubes of the evaporator and preventing normal operation. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0007] The purpose of this invention is to overcome the problems existing in the prior art and provide a multi-stage uniform liquid distribution device. The pore size of each liquid distribution stage is relatively large, making it less prone to scaling or pipe blockage, and it can make the liquid film in the falling film tube evenly distributed.

[0008] To solve the above technical problems, this utility model provides a multi-stage uniform liquid distribution device, including a preliminary liquid separator, a first-stage liquid distributor located directly below the preliminary liquid separator, a second-stage film distributor located directly below the first-stage liquid distributor, a second-stage liquid distribution plate located at the bottom of the second-stage film distributor, a plurality of second-stage liquid distribution holes evenly distributed on the second-stage liquid distribution plate, and an upwardly upright second-stage liquid distribution cylinder located on the outer periphery of the second-stage liquid distribution plate;

[0009] Each secondary liquid distribution hole on the secondary liquid distribution plate is provided with a toothed liquid distribution unit. The middle part of each toothed liquid distribution unit is embedded in the corresponding secondary liquid distribution hole and welded and fixed. The upper part of each toothed liquid distribution unit is symmetrically provided with three V-shaped overflow grooves that are wider at the top and narrower at the bottom. The bottom of each V-shaped overflow groove is flush with the upper surface of the secondary liquid distribution plate. The lower part of each toothed liquid distribution unit is symmetrically provided with three downwardly extending V-shaped drooping parts that are wider at the top and narrower at the bottom. Each V-shaped drooping part is located directly below the corresponding V-shaped overflow groove.

[0010] As an improvement of this utility model, the secondary liquid distribution plate is located above the upper tube sheet, and the adjacent falling film tube openings of the upper tube sheet are distributed in an equilateral triangle. Every three falling film tubes correspond to one toothed liquid distribution unit. The circumference of each toothed liquid distribution unit is located above the center of the three falling film tubes, and the V-shaped drooping part of each toothed liquid distribution unit points to the center point of the tube bridge between the three falling film tubes.

[0011] As a further improvement of this utility model, the bottom of the preliminary separator is provided with a preliminary separation plate, the diameter of which is 1 / 3 to 1 / 2 of the diameter of the upper tube plate, and there are a plurality of preliminary separation holes evenly distributed on it; the outer periphery of the preliminary separation plate is provided with an upwardly upright preliminary separation cylinder, and the outer circumference of the preliminary separation cylinder is suspended below the top wall of the upper tube box by a plurality of lifting rods.

[0012] As a further improvement of this utility model, the lower circumference of the preliminary liquid separating cylinder is evenly provided with a plurality of preliminary liquid separating grooves, each of which extends vertically upward, and the lower edge of the preliminary liquid separating groove is flush with the top surface of the preliminary liquid separating plate.

[0013] As a further improvement of this utility model, the bottom of the primary liquid distributor is provided with a primary liquid distribution plate; the primary liquid distribution plate is evenly distributed with a plurality of primary liquid distribution holes, the center line of each primary liquid distribution hole is located between two adjacent toothed liquid distribution units, and the outer periphery of the primary liquid distribution plate is provided with an upwardly upright primary liquid distribution cylinder.

[0014] Compared with the prior art, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. The aperture and flow rate of the initial liquid distribution hole are relatively large, making it less prone to clogging; although the first-stage liquid distribution plate also adopts a porous structure, the diameter of the first-stage liquid distribution hole is also relatively large, making it difficult to form bridging blockage. Each toothed liquid distribution unit adopts a toothed structure, which, in addition to better throughput and adjustable membrane flow rate over a wide range, basically eliminates the possibility of bridging due to scaling;

[0015] 2. After forming a tiny bridging structure at the lowest triangle of the V-shaped drooping part, the bridging structure will form a self-cleaning process due to the flushing of the liquid flow, which greatly extends the service life of the entire membrane system.

[0016] 3. Although the number of toothed liquid distribution units is only 1 / 3 of the number of falling film tubes, it can still accurately ensure that three film distribution points are evenly distributed on the outer periphery of each falling film tube below, which greatly improves the uniformity of film distribution.

[0017] 4. The multi-stage structure of the falling film evaporator, consisting of a preliminary distributor, a first-stage distributor, and a second-stage film distributor, along with a specially designed toothed distribution unit, significantly extends the chemical cleaning cycle and reduces the difficulty of chemical cleaning. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0019] Figure 1 This is an exploded view of the multi-stage uniform liquid distribution device of this utility model;

[0020] Figure 2 A three-dimensional magnified view of the secondary film distribution device;

[0021] Figure 3 This is a three-dimensional enlarged view of the toothed liquid distribution unit in the secondary film distributor;

[0022] Figure 4 This is a top view of the upper tube sheet and the toothed liquid distribution unit above it in this utility model.

[0023] In the diagram: 1. Feed inlet in the tube side; 2. Upper tube box;

[0024] 3. Preliminary separator; 3a. Preliminary separator tray; 3b. Preliminary separator trough;

[0025] 4. Primary liquid distributor; 5. Secondary film distributor;

[0026] 6. Toothed liquid distribution unit; 6a. V-shaped overflow groove; 6b. V-shaped droop;

[0027] 7. Upper tube sheet; 8. Falling film tube. Detailed Implementation

[0028] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0029] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0031] like Figures 1 to 4 As shown, the multi-stage uniform liquid distribution device of this utility model adopts a stacked structure of a preliminary distributor 3 + a first-stage distributor 4 + a second-stage film distributor 5. The preliminary distributor 3 is located below the feed liquid inlet 1 in the tube side and is coaxial with it. The bottom of the preliminary distributor 3 is provided with a preliminary distribution plate 3a. The outer periphery of the preliminary distribution plate 3a is provided with an upwardly raised preliminary distribution cylinder. The outer circumference of the preliminary distribution cylinder is suspended below the top wall of the upper tube box 2 by multiple lifting rods. The diameter of the preliminary distribution plate 3a is 1 / 3 to 1 / 2 of the diameter of the upper tube plate, and it has multiple preliminary distribution holes evenly distributed on it. Each preliminary distribution hole only performs preliminary liquid distribution. Therefore, the diameter and flow rate of the preliminary distribution holes are relatively large, and it is not easy to form a blockage.

[0032] The lower circumference of the preliminary liquid separating cylinder is uniformly provided with multiple preliminary liquid separating grooves 3b, each extending vertically upward, with its lower edge flush with the top surface of the preliminary liquid separating plate 3a. While each preliminary liquid separating hole distributes liquid downward, each preliminary liquid separating groove 3b around the perimeter also distributes liquid outward, ensuring that the liquid is distributed downward as evenly as possible.

[0033] A primary distributor 4 is located directly below the primary distributor 3, and a primary distributor plate is located at the bottom of the primary distributor 4. Multiple primary distributor holes are evenly distributed on the primary distributor plate, and an upward-standing primary distributor cylinder is located on the outer periphery of the primary distributor plate. Handles are symmetrically provided on the inner wall of the upper end of the primary distributor cylinder for easy installation and disassembly.

[0034] A secondary liquid distributor 5 is located directly below the primary liquid distributor 4. A secondary liquid distribution plate is located at the bottom of the secondary liquid distributor 5. Multiple secondary liquid distribution holes are evenly distributed on the secondary liquid distribution plate. A secondary liquid distribution cylinder is located on the outer periphery of the secondary liquid distribution plate and is vertically oriented upwards. Handles are symmetrically located on the inner wall of the upper end of the secondary liquid distribution cylinder.

[0035] Each secondary liquid distribution hole on the secondary liquid distribution plate is provided with a toothed liquid distribution unit 6. The middle part of each toothed liquid distribution unit 6 is embedded in the corresponding secondary liquid distribution hole and welded and fixed. The upper part of each toothed liquid distribution unit 6 is symmetrically provided with three V-shaped overflow grooves 6a that are wider at the top and narrower at the bottom. The bottom of each V-shaped overflow groove 6a is flush with the upper surface of the secondary liquid distribution plate. The lower part of each toothed liquid distribution unit 6 is symmetrically provided with three downwardly extending V-shaped drooping parts 6b that are wider at the top and narrower at the bottom. Each V-shaped drooping part 6b is located directly below the corresponding V-shaped overflow groove 6a.

[0036] The adjacent falling film tube openings of the upper tube sheet 7 are arranged in an equilateral triangle. Every three falling film tubes 8 correspond to a toothed liquid distribution unit 6. The circumference of each toothed liquid distribution unit 6 is located above the center of the three falling film tubes 8, and each V-shaped drooping part 6b of the toothed liquid distribution unit 6 points to the center point of the tube bridge between the three falling film tubes for liquid distribution.

[0037] The center line of each primary liquid distribution hole on the primary liquid distribution plate is located between two adjacent toothed liquid distribution units 6. Although the primary liquid distribution plate also adopts a porous structure, the number of primary liquid distribution holes is about 30% of the number of falling film tubes. Therefore, the diameter of the primary liquid distribution holes is also larger, and it is difficult to form bridging blockage.

[0038] The liquid on the secondary liquid distribution plate overflows from each V-shaped overflow groove 6a into the inner cavity of the toothed liquid distribution unit 6, flows down along its inner wall, and when it reaches the lower end of the V-shaped drooping part 6b, it accurately distributes the liquid to the center point of the pipe bridge between the three falling film pipes.

[0039] Each toothed liquid distribution unit 6 adopts a toothed structure, which not only provides better flowability and adjustable membrane flow rate over a wide range, but also reduces the number of toothed liquid distribution units 6 to only 1 / 3 of the number of falling film tubes. The diameter of the liquid distribution unit is approximately 1.37-1.5 times that of the falling film tube, virtually eliminating the possibility of bridging due to scaling. After a tiny bridging structure forms at the lowest triangle of the V-shaped drooping portion 6b, the bridging structure will self-clean due to the scouring effect of the liquid flow (especially for solutions containing solids), which greatly extends the service life of the entire membrane distribution system.

[0040] Although the number of toothed liquid distribution units 6 is only 1 / 3 of the number of falling film tubes, it can still accurately ensure that three film distribution points are evenly distributed on the outer periphery of each falling film tube below, which greatly improves the uniformity of film distribution.

[0041] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A multi-stage uniform distribution device comprising a preliminary distributor, characterized in that: A primary liquid distributor is located directly below the primary liquid distributor, and a secondary liquid distributor is located directly below the primary liquid distributor. A secondary liquid distribution plate is located at the bottom of the secondary liquid distributor, and multiple secondary liquid distribution holes are evenly distributed on the secondary liquid distribution plate. An upwardly oriented secondary liquid distribution cylinder is located on the outer periphery of the secondary liquid distribution plate. Each secondary liquid distribution hole on the secondary liquid distribution plate is provided with a toothed liquid distribution unit. The middle part of each toothed liquid distribution unit is embedded in the corresponding secondary liquid distribution hole and welded and fixed. The upper part of each toothed liquid distribution unit is symmetrically provided with three V-shaped overflow grooves that are wider at the top and narrower at the bottom. The bottom of each V-shaped overflow groove is flush with the upper surface of the secondary liquid distribution plate. The lower part of each toothed liquid distribution unit is symmetrically provided with three downwardly extending V-shaped drooping parts that are wider at the top and narrower at the bottom. Each V-shaped drooping part is located directly below the corresponding V-shaped overflow groove.

2. The multi-stage uniform distribution device of claim 1, wherein: The secondary liquid distribution plate is located above the upper tube sheet. The adjacent falling film tube openings of the upper tube sheet are distributed in an equilateral triangle. Every three falling film tubes correspond to one toothed liquid distribution unit. The circumference of each toothed liquid distribution unit is located above the center of the three falling film tubes, and the V-shaped drooping parts of each toothed liquid distribution unit point to the center point of the tube bridge between the three falling film tubes.

3. The multi-stage uniform distribution device of claim 2, wherein: The bottom of the preliminary separator is provided with a preliminary separation plate, the diameter of which is 1 / 3 to 1 / 2 of the diameter of the upper tube sheet, and there are multiple preliminary separation holes evenly distributed on it; the outer periphery of the preliminary separation plate is provided with an upwardly upright preliminary separation cylinder, and the outer circumference of the preliminary separation cylinder is suspended below the top wall of the upper tube box by multiple lifting rods.

4. The multi-stage uniform distribution device of claim 3, wherein: The lower circumference of the preliminary liquid separating cylinder is uniformly provided with multiple preliminary liquid separating grooves, each of which extends vertically upwards, and the lower edge of the preliminary liquid separating groove is flush with the top surface of the preliminary liquid separating plate.

5. The multi-stage uniform distribution device of claim 1, wherein: The bottom of the primary liquid distributor is provided with a primary liquid distribution plate; the primary liquid distribution plate is evenly distributed with multiple primary liquid distribution holes, the center line of each primary liquid distribution hole is located between two adjacent toothed liquid distribution units, and the outer periphery of the primary liquid distribution plate is provided with an upwardly upright primary liquid distribution cylinder.

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