Falling film evaporator feed distributor

Abstract

The application discloses a falling film evaporator feed distributor, which comprises a feed liquid distribution mechanism, the feed liquid distribution mechanism comprises an upper feed liquid scattering assembly, and the bottom of the upper feed liquid scattering assembly is fixedly connected with a feed liquid distribution plate assembly; the bottom of the feed liquid distribution plate assembly is communicated with a falling liquid pipe assembly; the feed liquid distribution plate assembly comprises a distribution base, the top of the distribution base is fixedly connected with a plurality of feed liquid distribution plates, distribution small holes are formed in the feed liquid distribution plates, a plurality of feed liquid shaking components are fixedly connected to the side walls on the two sides of the feed liquid distribution plates respectively, the feed liquid shaking components are arranged at the peripheral positions of the distribution small holes, the feed liquid shaking components comprise feed liquid shaking plates, and the feed liquid shaking components are fixedly connected to the feed liquid distribution plates through springs. The device structure realizes the distribution and mixing of the feed liquid in a shaking mode, increases the distribution path through resistance, and thus improves the feed liquid distribution effect, and ensures that the feed liquid can be fully distributed and treated when the feed liquid flow rate is high in the production process.

Description

Technical Field

[0001] This invention belongs to the technical field of distributors for falling film evaporators, and particularly relates to a feed distributor for a falling film evaporator. Background Technology

[0002] Falling film evaporation is a process in which the feed liquid is added from the upper tube box of the heating chamber of a falling film evaporator. Through a liquid distribution and film-forming device, it is evenly distributed into each heat exchange tube. Under the influence of gravity, vacuum induction, and airflow, it forms a uniform film that flows downwards. During this flow, the liquid is heated and vaporized by the shell-side heating medium. The resulting vapor and liquid phase enter the separation chamber of the evaporator together, where they are thoroughly separated. The vapor enters the condenser for condensation or enters the next effect evaporator as a heating medium, thus achieving multi-effect operation. The liquid phase is discharged from the separation chamber.

[0003] In industry, the equipment used in falling film evaporation is the falling film evaporator. Before the feed liquid enters the heat exchange tubes in the evaporator, it needs to be evenly distributed. Currently, feed liquid distributors are mostly used to distribute the feed liquid.

[0004] Specifically, after the liquid distributor is activated, the concentration of the liquid is not only evenly distributed, but the liquid also acts on the falling film evaporator in a stable physical state.

[0005] Therefore, the liquid distributor is an important part of falling film evaporation in industry. Based on this, there are many public reports on improvements to the liquid distributor technology, such as Chinese Patent Publication No. CN 208809492 U, which discloses a liquid distributor applied to falling film evaporators.

[0006] The disclosed distributor in this patent specifically employs an upper tube sheet and heat exchange tubes. The heat exchange tubes are vertically arranged, passing through and fixed to the upper tube sheet. The upper end face of the heat exchange tubes is flush with or slightly lower than the upper end face of the upper tube sheet. A liquid guide column is inserted into the upper part of the inner hole of the heat exchange tubes. The guide column includes an upper inlet and a lower outlet, as well as a constriction connecting the upper inlet and the lower outlet. The upper end of the upper inlet has a shoulder, and the guide column is supported on the upper tube sheet by the shoulder. A guide groove is provided on the outer circumference of the upper inlet, and a vent hole is provided in the middle of the guide column. An annular gap is formed between the outer surface of the lower outlet and the inner surface of the heat exchange tube. The liquid flows into the heat exchange tube along the guide groove, and then flows downward in a liquid film along the annular gap after passing through the constriction and the heat exchange tube to form a buffer zone. This technical solution achieves that after the liquid enters the heat exchange tube, it maintains a film-like flow, thereby improving the evaporation and concentration effect of the liquid.

[0007] However, the above-mentioned technical solution achieves film-like flow of the liquid material, which can only be carried out at a certain fluid flow rate. In actual industrial production, the production volume is large and the amount of liquid material that needs to be concentrated is large. This low-speed method simply cannot meet the actual production needs.

[0008] During the production process, it is necessary not only to meet the processing volume requirements, but also to ensure sufficient distribution of the liquid material. However, the traditional low-volume "fine" distribution is obviously not very suitable for industrial production.

[0009] Therefore, in industrial production, ensuring both efficient distribution and sufficient distribution of large volumes of liquid material has become a top priority. Summary of the Invention

[0010] Based on the above background, the purpose of this invention is to provide a feed distributor for a falling film evaporator.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A falling film evaporator feed distributor includes a liquid distribution mechanism, wherein the liquid distribution mechanism includes a liquid feeding and dispersing assembly, and a liquid distribution plate assembly is fixedly connected to the bottom of the liquid feeding and dispersing assembly.

[0013] The bottom of the liquid distribution plate assembly is connected to a downcomer assembly;

[0014] The liquid distribution plate assembly includes a distribution base, a plurality of liquid distribution plates are fixedly connected to the top of the distribution base, each of the liquid distribution plates has distribution holes, and a plurality of liquid shaking components are fixedly connected to the side walls on both sides of the liquid distribution plates; the liquid shaking components are arranged around the distribution holes.

[0015] The liquid shaking component includes a liquid shaking plate, which is fixedly connected to the liquid distribution plate by a spring.

[0016] Preferably, the transverse cross-sectional shape of the distribution base is circular;

[0017] The liquid distribution plates are arranged at intervals on the top of the distribution base.

[0018] Preferably, the liquid distribution plate is rectangular in shape, with all liquid distribution plates having the same height and different widths.

[0019] Preferably, the distribution base has a plurality of liquid discharge holes, and the liquid distribution plate is distributed on both sides of the liquid discharge holes.

[0020] Preferably, the feeding liquid dispersing assembly includes an annular dispersing frame, and a dispersing spring net for dispersing the feeding liquid is fixedly connected to the inner side wall of the annular dispersing frame.

[0021] Preferably, the swing spring net includes a plurality of ring-shaped swing springs, the outer ends of which are welded to the inner sidewall of the ring-shaped swing frame.

[0022] The inner ends of the swing springs are welded together and fixed.

[0023] Preferably, an annular base plate is fixedly connected to the bottom of the annular scattering frame;

[0024] The bottom of the annular base plate is welded to the top of the liquid distribution plate located at the edge.

[0025] Preferably, a lower assembly cylinder is fixedly connected to the bottom of the distribution base, and the downcomer assembly is located inside the lower assembly cylinder.

[0026] Preferably, the downcomer assembly includes a plurality of downcomers assembled and connected at the bottom of the downcomer through hole;

[0027] The bottom of the lower assembly cylinder is welded with a bottom mounting flange, and a number of mounting screws are threaded onto the bottom mounting flange.

[0028] Preferably, the cross-sectional shape of the liquid shaking plate is triangular, and the liquid shaking plate is provided with a plurality of material passage holes.

[0029] The present invention has the following beneficial effects:

[0030] 1. A liquid distribution mechanism is used, which includes a liquid feeding and dispersing assembly, with a liquid distribution plate assembly fixedly connected to its bottom. During operation, the liquid feeding and dispersing assembly initially disperses the liquid using a shaking motion, and the liquid distribution plate assembly further distributes the liquid. After these two distributions, the liquid flows down through a downcomer assembly connected to the bottom of the liquid distribution plate assembly and enters the heat exchange tubes of the falling film evaporator for further processing.

[0031] 2. The liquid distribution plate assembly specifically employs a liquid distribution plate and liquid shaking components. During the liquid discharge process, to improve the mixing degree between different components in the liquid, several liquid shaking components are fixedly connected to the side walls on both sides of the liquid distribution plate. Specifically, as the liquid flows down the liquid distribution plate, under the action of gravity, the liquid impacts the liquid shaking components. These components shake the liquid, thus reducing the discharge speed and promoting mixing between different components in the liquid.

[0032] 3. Specifically, the liquid shaking component is designed to include a liquid shaking plate, which is fixedly connected to the liquid distribution plate by a spring. Specifically, the liquid shaking plate has a triangular cross-sectional shape, and several material passage holes are provided on the liquid shaking plate.

[0033] During operation, the lower discharge liquid impacts the liquid shaking plate. At this time, because the liquid shaking plate is fixed to the liquid distribution plate by springs, under the shaking of the springs, the liquid shaking plate increases the mixing degree of different components in the liquid by slapping and lifting the liquid upwards, and increases the path length of the liquid through the liquid shaking plate by bending downwards to prevent the liquid from falling rapidly, thereby improving the distribution effect of the liquid.

[0034] Under the action of the above two methods, the liquid is fully distributed and mixed when it passes through the liquid distribution plate, resulting in a high degree of mixing and uniform distribution of the liquid after discharge.

[0035] 4. During the process of distributing the liquid through the feeding liquid dispersion component, when the feeding liquid dispersion component above the liquid distribution plate encounters the liquid, factors such as the momentum and gravity of the liquid cause the dispersion spring net to shake. During the shaking process, the liquid is dispersed and flow is obstructed. Specifically, under the flow obstruction effect of the dispersion spring net and the elastic swinging effect of the dispersion spring net, the liquid is changed from the "liquid column" to the "liquid surface" in a swinging and dispersing manner. After the change in manner, the uniformity of the liquid is initially improved.

[0036] 5. Specifically, the oscillating spring mesh comprises several annularly distributed oscillating springs. The outer ends of the oscillating springs are welded to the inner wall of the annular oscillating frame; the inner ends of the oscillating springs are welded and fixed together. This achieves a highly elastic mesh structure formed by spring welding, which can act elastically on the liquid material, obstructing and dispersing the liquid flow, thereby ensuring that the liquid material can be evenly distributed and enter the liquid distribution plate below.

[0037] 6. The device disclosed in this invention distributes and mixes the liquid material by shaking and swaying, thereby increasing the distribution path by obstructing the flow and improving the distribution effect of the liquid material. This ensures that when the liquid material flow rate is high during the production process (in industrial production, the volume of liquid material is large, and traditional slow distribution methods cannot meet the production needs at all), the liquid material can be fully distributed and processed. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the liquid distribution plate in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the liquid shaking component fixedly connected to the liquid distribution plate in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of the liquid agitation component in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of the feeding liquid dispersion assembly in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of the planar structure of the feeding liquid dispersion component in an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the dispersed structure in an embodiment of the present invention;

[0046] Figure 8 This is a schematic diagram of the distribution structure of the liquid distribution plate on the distribution base in an embodiment of the present invention.

[0047] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0050] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0051] Example 1

[0052] like Figure 1-8 As shown, a falling film evaporator feed distributor includes a liquid distribution mechanism, which comprises a liquid feeding and dispersing assembly 1, with a liquid distribution plate assembly 2 fixedly connected to the bottom of the liquid feeding and dispersing assembly 1. During operation, the liquid feeding and dispersing assembly 1 initially disperses the liquid using a shaking and swaying motion, and the liquid distribution plate assembly 2 further distributes the liquid. After these two distributions, the liquid flows down through a downcomer assembly connected to the bottom of the liquid distribution plate assembly 2 and enters the heat exchange tubes of the falling film evaporator for further processing.

[0053] The specific structure of the liquid distribution plate assembly 2 is as follows:

[0054] The liquid distribution plate assembly 2 includes a distribution base 3 (the distribution base 3 adopts a disc structure design). Several liquid distribution plates 21 are fixedly connected to the top of the distribution base 3. The liquid distribution plates 21 have the same height but different widths. Specifically, the liquid distribution plates 21 are distributed in a front-to-back manner on the top of the distribution base 3. Their widths are set in an arithmetic progression based on the center line of the distribution base 3.

[0055] The liquid distribution plate 21 is made of stainless steel plate (the shape of the liquid distribution plate 21 is rectangular), and small distribution holes 211 are opened on the liquid distribution plate 21. The distribution holes 211 integrate all the liquid distribution plates 21. During operation, when the liquid flows into the liquid distribution plate 21, the liquid that has been initially distributed flows down the side wall of the liquid distribution plate 21 and is discharged. During the discharge process, the liquid is ensured to be fully mixed.

[0056] During the discharge of the liquid, in order to improve the mixing degree between different components in the liquid, several liquid shaking components 22 are fixedly connected to the side walls on both sides of the liquid distribution plate 21; the liquid shaking components 22 are arranged around the distribution holes 211.

[0057] Specifically, as the liquid flows down the liquid distribution plate 21, it impacts the liquid shaking component 22 under the action of gravity. The liquid shaking component 22 shakes the liquid to reduce the discharge speed and promote the mixing of different components in the liquid.

[0058] The liquid agitation component 22 includes a liquid agitation plate 221, which is fixedly connected to the liquid distribution plate 21 by a spring. Specifically, the liquid agitation plate 221 has a triangular cross-sectional shape, and a plurality of liquid through holes 2211 are provided on the liquid agitation plate 221.

[0059] During operation, the lower discharge liquid impacts the liquid shaking plate 221. At this time, because the liquid shaking plate 221 is fixed to the liquid distribution plate 21 by the spring 222, under the shaking of the spring 222, the liquid shaking plate 221 increases the mixing degree of different components in the liquid by slapping and lifting the liquid upwards, and increases the path length of the liquid through the liquid shaking plate 221 by bending downwards to prevent the liquid from falling rapidly, thereby improving the distribution effect of the liquid.

[0060] Under the action of the above two methods, the liquid is fully distributed and mixed when it passes through the liquid distribution plate 21, resulting in a high degree of mixing and uniform distribution of the liquid after discharge.

[0061] Example 2

[0062] like Figure 1-8 As shown, based on the structure of Example 1, in order to improve the distribution effect of the liquid when it passes through the liquid distribution plate 21, the above-mentioned liquid dispersing assembly 1 includes an annular dispersing frame 11, and a dispersing spring net 13 for dispersing liquid is fixedly connected to the inner side wall of the annular dispersing frame 11.

[0063] Specifically, when the liquid distribution plate 21 above the liquid distribution assembly 1 encounters the liquid, the momentum, gravity and other factors of the liquid cause the dispersing spring net 13 to shake. During the shaking process, the liquid is dispersed and flow is obstructed. Specifically, under the flow obstruction effect of the dispersing spring net 13 and the elastic swinging effect of the dispersing spring net 13, the liquid is changed from the "liquid column" to the "liquid stream" in a swinging and dispersing manner. After the change in manner, the uniformity of the liquid is initially improved.

[0064] Specifically, the aforementioned swing spring net 13 includes a plurality of ring-shaped swing springs, the outer ends of which are welded to the inner sidewall of the ring swing frame 11; the inner ends of the swing springs are welded and fixed to each other.

[0065] Meanwhile, an annular base plate 12 is fixedly connected to the bottom of the annular dispersing frame 11; the bottom of the annular base plate 12 is welded to the top of the liquid distribution plate 21 located at the edge.

[0066] Example 3

[0067] like Figure 1-8 As shown, in this embodiment, based on the structure of embodiment 1, after the liquid is distributed by the liquid distribution plate 21, in order to ensure that the liquid is evenly discharged and fed into the heat exchange tube, the distribution base 3 is provided with a number of liquid discharge holes 31, and the liquid distribution plate 21 is distributed on both sides of the liquid discharge holes 31.

[0068] The bottom of the distribution base 3 is fixedly connected to the lower assembly cylinder 4, and the downcomer assembly is located inside the lower assembly cylinder 4.

[0069] Meanwhile, the downcomer assembly includes several downcomer pipes 5 assembled and connected at the bottom of the downcomer through hole 31; the bottom of the lower assembly cylinder 4 is welded with a bottom mounting flange 41, and several mounting screws 411 are threadedly connected to the bottom mounting flange 41.

[0070] According to the existing method, after the bottom mounting flange 41-mounting screw 411 structure is installed to the feed inlet of the falling film evaporator, the liquid outlet end of the downcomer 5 is aligned and connected to the heat exchange tube.

[0071] During operation, the distributed liquid enters the falling film evaporator through each liquid outlet 31 via the downcomer 5 and acts on the heat exchange tubes for evaporation and concentration.

[0072] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A feed distributor for a falling film evaporator, characterized in that, The system includes a liquid distribution mechanism, which includes a liquid feeding and dispersing assembly, and a liquid distribution plate assembly is fixedly connected to the bottom of the liquid feeding and dispersing assembly. The bottom of the liquid distribution plate assembly is connected to a downcomer assembly; The liquid distribution plate assembly includes a distribution base, a plurality of liquid distribution plates are fixedly connected to the top of the distribution base, each of the liquid distribution plates has distribution holes, and a plurality of liquid shaking components are fixedly connected to the side walls on both sides of the liquid distribution plates; the liquid shaking components are arranged around the distribution holes. The liquid shaking component includes a liquid shaking plate, and the liquid shaking component is fixedly connected to the liquid distribution plate by a spring; The feeding liquid dispersion assembly includes an annular dispersion frame, on the inner side wall of which a dispersion spring net for dispersing the liquid is fixedly connected; the dispersion spring net includes a plurality of annularly distributed dispersion springs, the outer ends of which are welded to the inner side wall of the annular dispersion frame. The inner ends of the swing springs are welded together and fixed.

2. The falling film evaporator feed distributor according to claim 1, characterized in that, The cross-sectional shape of the distribution base is circular; The liquid distribution plates are arranged at intervals on the top of the distribution base.

3. The falling film evaporator feed distributor according to claim 2, characterized in that, The liquid distribution plates are rectangular in shape, with all plates having the same height but different widths.

4. The falling film evaporator feed distributor according to claim 1, characterized in that, The distribution base has several liquid discharge holes, and the liquid distribution plate is distributed on both sides of the liquid discharge holes.

5. The falling film evaporator feed distributor according to claim 1, characterized in that, The bottom of the annular swing frame is fixedly connected to an annular base plate; The bottom of the annular base plate is welded to the top of the liquid distribution plate located at the edge.

6. The falling film evaporator feed distributor according to claim 5, characterized in that, The bottom of the distribution base is fixedly connected to a lower assembly cylinder, and the downcomer assembly is located inside the lower assembly cylinder.

7. The falling film evaporator feed distributor according to claim 6, characterized in that, The downcomer assembly includes several downcomers assembled and connected at the bottom of the downcomer through hole; The bottom of the lower assembly cylinder is welded with a bottom mounting flange, and a number of mounting screws are threaded onto the bottom mounting flange.

8. The falling film evaporator feed distributor according to claim 1, characterized in that, The cross-sectional shape of the liquid shaking plate is triangular, and the liquid shaking plate has several material passage holes.

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