Falling film evaporation separator

Abstract

The utility model provides a falling film evaporation separator which comprises a separator body, and the separator body comprises a falling film evaporation part and a separation part; a falling film evaporation chamber of the falling film evaporation part is provided with a distribution assembly and a heat exchange tube bundle, the lower part of the heat exchange tube bundle extends into a separation chamber of the separation part, and the distribution assembly comprises a spraying ring which is communicated with the feeding hole and is used for spraying entering liquid; the at least two layers of distribution plates are arranged at the lower part of the spraying ring and are used for carrying out at least secondary distribution on the sprayed liquid, and a plurality of flow guide pipes are arranged at the bottom of each distribution plate; the separation chamber is provided with a gas-liquid separation assembly used for separating gas and liquid phases, and a pipe opening gas-liquid separation piece used for separating gas and liquid at a gas outlet is arranged in the gas outlet of the separation chamber. According to the falling film evaporation separator, the scheme is optimized, uniform distribution of fluid, efficient vaporization of liquid and efficient separation of gas and liquid can be achieved, and the falling film evaporation separator is compact in structure, reasonable in layout, high in heat transfer efficiency and wide in application range.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and more specifically, to a falling film evaporation separator. Background Art

[0002] There are three main types of evaporators: flooded evaporator, dry evaporator, and falling film evaporator. Among them, the falling film evaporator is widely used in medicine, food, chemical industry, light industry and other industries due to its advantages such as large heat transfer coefficient, small temperature difference, small pressure drop, and short residence time.

[0003] The fluid of the falling film evaporator is distributed through the distributor and evenly distributed to each heat exchange tube. Under the action of gravity and airflow, it flows from top to bottom in a uniform film. The fluid vaporizes in the heat exchange tube, and the generated steam and liquid phase enter the bottom chamber of the evaporator together, and the gas and liquid are separated in the bottom chamber.

[0004] At present, the falling film evaporators on the market cannot effectively achieve uniform distribution of the fluid to form a film, and the separation chamber at the bottom is a hollow cavity, which cannot achieve sufficient separation of the gas and liquid phases. Utility Model Content

[0005] The present application provides a falling film evaporation separator, which realizes uniform distribution of fluid film formation, can realize efficient vaporization of liquid, and realizes efficient separation of gas and liquid, thereby improving production efficiency and reducing production costs.

[0006] The present application provides a falling film evaporation separator, comprising a separator body, wherein the separator body comprises a falling film evaporation part and a separation part arranged at the lower part of the falling film evaporation part; a falling film evaporation chamber of the falling film evaporation part is provided with a distribution component and a heat exchange tube bundle, the lower part of the heat exchange tube bundle extends into the separation chamber of the separation part, and the distribution component comprises:

[0007] A spray ring, connected to the feed port, for spraying the incoming liquid;

[0008] At least two layers of distribution plates are arranged at the bottom of the spraying circle to distribute the sprayed liquid at least twice, and a plurality of guide pipes are arranged at the bottom of each distribution plate;

[0009] The separation chamber is provided with a gas-liquid separation component for separating gas and liquid phases, and the interior of the gas outlet of the separation chamber is provided with a pipe-mouth gas-liquid separation piece for separating the gas and liquid at the gas outlet.

[0010] In some embodiments, the separation chamber has a diameter greater than a diameter of the falling film evaporation chamber.

[0011] In some embodiments, the bottom of the separation portion is an inverted cone structure that tapers axially from top to bottom.

[0012] In some embodiments, the spray ring is specifically a spiral structure, and a plurality of spray holes are arranged at the bottom of the spray ring.

[0013] In some embodiments, a top edge of each of the distribution plates is provided with a cofferdam inclined toward the interior of the distribution plate.

[0014] In some embodiments, the distribution holes of two adjacent distribution plates are staggered.

[0015] In some embodiments, the heat exchange tube bundle includes a plurality of heat exchange tubes and a plurality of baffles for fixing the heat exchange tubes to the inner wall of the falling film evaporator section, each of the baffles is arranged in a spiral shape, each of the baffles is provided with a plurality of plate holes, and the heat exchange tubes are inserted into the plate holes; a tube outlet distribution head is provided at the top of each of the heat exchange tubes, and a conical tube cap is provided at the top of each of the tube outlet distribution heads for preventing the generated gas from rising.

[0016] In some embodiments, the gas-liquid separation component is specifically a plurality of corrugated wire meshes.

[0017] In some embodiments, the pipe mouth gas-liquid separation element is specifically a wire mesh.

[0018] The falling film evaporation separator provided in the present application is provided with a spray ring at the feed inlet, and a multi-layer distributor is provided at the lower part of the spray ring to distribute the fluid, so that the fluid distribution is more uniform, the heat transfer efficiency is higher, and the application range is wider. In addition, by providing a gas-liquid separation component for separating the gas-liquid two-phase inside the separation chamber, and providing a pipe-mouth gas-liquid separation member inside the gas outlet of the separation chamber, the liquid inside the separation chamber can be efficiently vaporized and effectively separated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 A front view of the falling film evaporation separator provided in this application;

[0021] Figure 2 for Figure 1 A top view of

[0022] Figure 3 for Figure 2 Cross-sectional view of the middle AA part;

[0023] Figure 4 A schematic diagram of the spray ring provided for this application;

[0024] Figure 5 A schematic diagram of a distribution plate provided for this application;

[0025] Figure 6 A schematic diagram of the nozzle distribution head provided for this application;

[0026] Among them, 1- falling film evaporation section, 2- separation section, 3- feed inlet, 4- down extension pipe, 5- spray circle, 6- distribution plate, 7- guide pipe, 8- gas-liquid separation component, 9- pipe mouth gas-liquid separation component, 10- cofferdam, 11- heat exchange tube, 12- baffle, 13- pipe mouth distribution head, 14- conical pipe cap, 15- steam inlet, 16- condensate outlet, 17- gas outlet, 18- liquid outlet, 19- upper tube plate. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] refer to Figures 1 to 3 , Figure 1 A front view of the falling film evaporation separator provided in this application; Figure 2 for Figure 1 A top view of Figure 3 for Figure 2 Cross-sectional view of the AA portion.

[0029] The present application provides a falling film evaporation separator, comprising a separator body, wherein the separator body comprises a falling film evaporation part 1 and a separation part 2 , wherein the separation part 2 is arranged at the lower part of the falling film evaporation part 1 and is vertically connected with the falling film evaporation part 1 .

[0030] Specifically, a falling film evaporation chamber is provided inside the falling film evaporation section 1, and the separation section 2 is provided at the lower part of the falling film evaporation section 1. A separation chamber is provided inside the separation section 2, and the falling film evaporation chamber and the separation chamber are vertically connected. A feed port 3 is provided at the top of the falling film evaporation section 1 of the upper section, and a steam inlet 15 and a condensed water outlet 16 are provided on the side. A liquid outlet 18 is provided at the bottom of the separation section 2 of the lower section, and a gas outlet 17 is provided on the side.

[0031] In addition, the falling film evaporation chamber is provided with a distribution component and a heat exchange tube bundle, wherein the distribution component includes: a spray ring 5, at least two layers of distribution plates 6 and a plurality of guide pipes 7. The upper end of the spray ring 5 is connected to the feed port 3, and the liquid entering from the feed port 3 is sprayed through the spray ring 5. The distribution plate 6 is arranged at the lower part of the spray ring 5, and the number of the distribution plates 6 is at least two layers, which are arranged vertically to distribute the liquid sprayed by the spray ring 5 multiple times. Each distribution plate 6 is a circular sieve plate covered with distribution holes, and the lower part of each distribution hole is connected to the guide pipe 7. The bottom of the guide pipe 7 is close to the distribution plate 6 below, and is staggered with the distribution holes of the distribution plate 6 below. Or the bottom of the guide pipe 7 is close to the upper tube plate 19 below. The liquid on the distribution plate 6 is guided to the lower distribution plate 6 through the guide pipe 7, and finally guided to the upper tube plate 19.

[0032] The separation chamber is provided with a gas-liquid separation component 8 for separating the gas and liquid phases in the separation chamber, and a pipe-mouth gas-liquid separation piece 9 is provided inside the gas outlet 17 of the separation chamber for separating the gas and liquid in the gas outlet 17 .

[0033] The heat exchange tube 11 is extended downward to the separation chamber of the lower separation part 2 so that the generated gas-liquid two-phase is discharged in the middle section of the lower separation chamber, thereby increasing the gas-liquid separation residence time.

[0034] When in use, steam is introduced from the side steam inlet 15 of the separator body, and condensed water flows out from the condensed water outlet 16. The fluid enters from the top feed port 3, passes through the lower extension pipe 4 and enters the spray circle 5 for distribution. The distributed fluid falls on the upper distribution plate 6, flows from the guide pipe 7 to the lower distribution plate 6, passes through each distribution plate 6 for multiple distributions, and passes through the guide pipe 7 of the lower distribution plate 6, so that the fluid falls on the upper tube plate 19. After reaching a certain liquid level, it enters the heat exchange tube bundle and forms a film for vaporization. The vaporized gas-liquid two-phase enters the lower separation chamber through the downwardly extending heat exchange tube 11, and is fully separated by gravity sedimentation, gas-liquid separation assembly 8 and pipe port gas-liquid separation element 9. The separated gas phase flows out from the gas outlet 17, and the liquid phase flows out from the liquid outlet 18.

[0035] The present application has a novel structure, a compact layout, uniform fluid distribution, high heat transfer efficiency, a wide range of applications, and can achieve efficient liquid vaporization and effectively achieve gas-liquid two-phase separation.

[0036] In a preferred embodiment, the lower separation section 2 of the separation chamber adopts a diameter expansion scheme to increase the diameter of the separation chamber so that the diameter of the separation chamber is larger than the diameter of the falling film evaporation chamber, thereby reducing the generated gas-liquid two-phase flow rate and achieving the technical effect of improving the sedimentation efficiency.

[0037] Furthermore, the bottom of the separation portion 2 adopts a cone bottom structure, which is an inverted cone structure that tapers from top to bottom along the axial direction, thereby reducing the dead zone.

[0038] refer to Figure 4 , Figure 4 Schematic diagram of the spray ring provided in this application. The spray ring 5 is specifically a spiral structure formed by a round tube, and a plurality of spray holes are arranged at the bottom of the spray ring 5. The spiral structure can increase the spray area and improve the uniformity of the spray.

[0039] refer to Figure 3 Combination Figure 5 The top edge of each distribution plate 6 is provided with a cofferdam 10, the top of which is inclined inward to prevent liquid from splashing out. In addition, the distribution holes on the upper distribution plate 6 and the lower distribution plate 6 are staggered to improve the distribution efficiency and distribution effect.

[0040] In a specific embodiment, the heat exchange tube bundle includes a plurality of heat exchange tubes 11 and a plurality of baffles 12. The baffles 12 are fixed on the inner wall of the falling film evaporation chamber. Each baffle 12 is provided with a plurality of plate holes. The heat exchange tubes 11 are inserted into the plate holes one by one. The heat exchange tubes 11 are fixed by the baffles 12, the upper tube sheet 19 and the lower tube sheet.

[0041] refer to Figure 6 Each baffle 12 is a plate-like structure and is arranged in a spiral shape along the inner wall of the falling film evaporation chamber. A tube outlet distribution head 13 is arranged on the top of each heat exchange tube 11. The tube outlet distribution head 13 is composed of an outwardly extending heat exchange tube 11, an overflow port with a toothed notch, and a conical tube cap 14. The liquid on the upper tube sheet enters the heat exchange tube 11 through the overflow port with a toothed notch. A conical tube cap 14 is arranged on the top of each tube outlet distribution head 13 to prevent the generated gas from rising.

[0042] The gas-liquid separation component 8 is specifically a plurality of wire meshes, which are in a corrugated, serrated, or arc-shaped shape. The wire meshes are used to gather small droplets of high-temperature gas condensed by cooling into large droplets, and the formed large droplets are discharged from the liquid outlet 18 below under gravity.

[0043] Similarly, the pipe port gas-liquid separator 9 also uses a wire mesh, thereby further improving the gas-liquid separation effect at the liquid outlet 18.

[0044] The falling film evaporation separator provided in the present application has a compact layout, uniform fluid distribution, high heat transfer efficiency, and a wide range of applications. It effectively realizes uniform distribution of the fluid to form a film and sufficient separation of the gas-liquid two phases, thereby improving production efficiency and saving production costs.

[0045] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0046] The falling film evaporation separator provided by the present application is introduced in detail above. The principle and implementation method of the present application are described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A falling film evaporation separator, comprising a separator body, wherein the separator body comprises a falling film evaporation section (1) and a separation section (2) arranged at the lower part of the falling film evaporation section (1); the falling film evaporation chamber of the falling film evaporation section (1) is provided with a distribution component and a heat exchange tube bundle, the lower part of the heat exchange tube bundle extends into the separation chamber of the separation section (2), characterized in that: The distribution components include: A spray ring (5), connected to the feed port (3) and used for spraying the incoming liquid; At least two layers of distribution plates (6) are arranged at the bottom of the spraying circle (5) to distribute the sprayed liquid at least twice, and a plurality of guide pipes (7) are arranged at the bottom of each distribution plate (6); The separation chamber is provided with a gas-liquid separation component (8) for separating gas and liquid phases, and the interior of the gas outlet (17) of the separation chamber is provided with a pipe-mouth gas-liquid separation element (9) for separating the gas and liquid at the gas outlet (17).

2. The falling film evaporation separator according to claim 1, characterized in that: The diameter of the separation chamber is greater than the diameter of the falling film evaporation chamber.

3. The falling film evaporation separator according to claim 2, characterized in that: The bottom of the separation portion (2) is an inverted cone-shaped structure that tapers from top to bottom along the axial direction.

4. The falling film evaporation separator according to any one of claims 1 to 3, characterized in that: The spray ring (5) is specifically a spiral structure, and a plurality of spray holes are arranged at the bottom of the spray ring (5).

5. The falling film evaporation separator according to claim 1, characterized in that: The top edge of each distribution plate (6) is provided with a cofferdam (10) inclined toward the inside of the distribution plate (6).

6. The falling film evaporation separator according to claim 5, characterized in that: The distribution holes of two adjacent distribution plates (6) are staggered.

7. The falling film evaporation separator according to claim 1, characterized in that: The heat exchange tube bundle comprises a plurality of heat exchange tubes (11) and a plurality of baffles (12) for fixing the heat exchange tubes (11) to the inner wall of the falling film evaporation section (1); each of the baffles (12) is provided with a plurality of plate holes, and the heat exchange tubes (11) are inserted into the plate holes; a tube outlet distribution head (13) is provided at the top of each of the heat exchange tubes (11); and a conical tube cap (14) is provided at the top of each of the tube outlet distribution heads (13) for preventing the generated gas from escaping upward.

8. The falling film evaporation separator according to claim 1, characterized in that: The gas-liquid separation component (8) is specifically a plurality of corrugated wire meshes.

9. The falling film evaporation separator according to claim 1, characterized in that: The pipe port gas-liquid separation element (9) is specifically a wire mesh.

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