Plate type falling film multi-effect brackish water desalting device

Abstract

The utility model provides a plate type falling film multi-effect brackish water desalting device, relates to the field of water treatment, and solves the problems that the water production cost is high and a film is extremely easy to block in the existing desalting mode. The device comprises a shell, a preheater, a first water distributor and a heating plate are fixed in the shell, a gap exists between the preheater and the heating plate, a raw water flow channel is formed in the preheater, a water outlet of the raw water flow channel is communicated with a water inlet of the first water distributor, the first water distributor is fixed to the upper portion of the corresponding heating plate, and the heating plate is fixed to the lower portion of the shell. The heating plate is used for enabling preheated water to flow down along the plate surface of the heating plate in a water film form; a concentrated water drainage groove and a fresh water drainage groove which are independent of each other are formed in the bottom of the shell and located between the preheater and the heating plate, and the fresh water drainage groove is located on the side close to the preheater. The device utilizes a multi-effect distillation method, is small in occupied area, realizes maximization of fresh water yield under the condition of using extremely few equipment, and is suitable for desalination of raw water with high soluble inorganic salt content.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field especially is related to a plate type falling film multi -effect bitter -salty water desalination device. BACKGROUND

[0002] In prior art, there are a large number of bitter-salty water in many areas, bitter-salty water refers to the alkalinity greater than hardness and contains more neutral salt, and its pH value is usually greater than 7. This kind of water quality is bitter in taste, and it is difficult to drink directly, and long-term drinking can cause adverse effects on human health. Through conventional treatment, ideal water quality cannot be achieved.

[0003] In prior art, membrane process is usually used to treat bitter-salty water, and the membrane process uses the selective separation characteristics of semi-permeable membrane to remove salt, impurities and other harmful substances in water.

[0004] The applicant finds that the prior art at least has the following technical problems: this way produces water with high cost, and the membrane is easily blocked, which seriously affects its service life. UTILITY MODEL CONTENT

[0005] The utility model discloses a plate type falling film multi -effect bitter -salty water desalination device to solve the technical problems of the prior art, such as high water production cost of bitter-salty water desalination, and the membrane is easily blocked, which seriously affects its service life. The preferred technical solutions in many technical solutions provided by the utility model can produce many technical effects, which are described in detail below.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model discloses a plate type falling film multi -effect bitter -salty water desalination device, including the casing, the preheater, the first water distributor and the heating plate are fixed in the casing, wherein:

[0008] There is a spacing between the preheater and the heating plate, the preheater has raw water flow channel, the water outlet of raw water flow channel is linked with the water inlet of the first water distributor, the first water distributor is fixed in the upper portion corresponding to the heating plate, and is used for flowing down along the board surface of the heating plate in the form of water film after preheating water.

[0009] The bottom of the casing is provided with independent concentrated water drainage groove and fresh water drainage groove, the concentrated water drainage groove and the fresh water drainage groove are located between the preheater and the heating plate, and the fresh water drainage groove is located on the side close to the preheater.

[0010] Preferably, the bottom of the casing is fixed with a partition plate, and the partition plate is located between the concentrated water drainage groove and the fresh water drainage groove.

[0011] Preferably, the preheater is located on opposite sides of the heating plate.

[0012] Preferably, the preheater is vertically arranged, an inner cavity of the preheater forms the raw water flow channel, a water inlet of the raw water flow channel is communicated with a raw water tank, a water outlet of the raw water flow channel is communicated with a preheated water tank, and a water outlet of the preheated water tank is communicated with a water inlet of the first water distributor.

[0013] Preferably, the raw water tank is communicated with the preheater through a water inlet pipeline, and a control valve is arranged on the water inlet pipeline.

[0014] The preheated water tank is communicated with the first water distributor through a water distribution pipeline, and a pump body and a liquid level meter are arranged in the preheated water tank, the pump body is communicated with the water distribution pipeline, and the liquid level meter is used to detect the water level in the preheated water tank.

[0015] Preferably, the preheater comprises a box body, an inner cavity of the box body is configured as a raw water flow channel, a second water distributor is fixed to a top of the box body, and two ends of the second water distributor are fixedly connected with the box body.

[0016] A flow gap is arranged between a side of the second water distributor and an inner wall of the box body.

[0017] The second water distributor is in a U-shaped structure, a sawtooth opening is arranged on a side wall of the second water distributor, the sawtooth opening is communicated with the side wall of the second water distributor along, and the sawtooth openings are arranged along a length direction of the second water distributor.

[0018] Preferably, the first water distributor comprises a water distribution pipe and a support, wherein:

[0019] The support is fixed to a top of the shell, the water distribution pipe penetrates through the support, a water distribution hole is arranged on the water distribution pipe, the water distribution holes are arranged along a length direction of the water distribution pipe, and water discharged from the water distribution holes can flow along a surface of the support to a plate surface of the heating plate.

[0020] Preferably, the support comprises an inclined plate, the inclined plate is located on opposite sides of the heating plate, the inclined plate is arranged in an inclined manner from top to bottom along a direction towards the heating plate, and a lower end of the inclined plate is arranged in parallel with the heating plate.

[0021] The water distribution pipe penetrates through the inclined plate, and the water distribution pipe extends along a longitudinal direction of the heating plate.

[0022] Preferably, the concentrated water drainage tank and the fresh water drainage tank are both arranged to be inclined compared with the horizontal plane, the drainage end of the concentrated water drainage tank and the fresh water drainage tank is the low end, the water outlet of the concentrated water drainage tank is connected with a concentrated water tank, and the water outlet of the fresh water drainage tank is connected with a fresh water tank.

[0023] Preferably, the plate type falling film multi-effect brackish water desalination device comprises an upper cover plate, a lower cover plate and an outer cover, wherein:

[0024] The upper and lower ends of the outer cover are respectively embeddedly and fixedly connected with the upper cover plate and the lower cover plate, and the upper cover plate and the lower cover plate are locked through a screw rod;

[0025] The heating plate is fixed with a temperature probe for detecting the temperature of the heating plate, and a control unit is electrically connected with the temperature probe for controlling the heating plate to stop heating after the temperature of the heating plate reaches a set value.

[0026] Compared with the prior art, the plate type falling film multi-effect brackish water desalination device has the following beneficial effects: the multi-effect distillation method is used, the brackish water is preheated by a preheater, enters a first water distributor, the preheated water flows through a heating plate in the form of a water film, is heated on the heating plate, and part of the water is vaporized in the process, the vaporized water vapor diffuses to the outer wall of the preheater and the water film of raw water in the raw water flow channel in the preheater to form heat conduction, the heat utilization rate is improved, and part of the vaporized water vapor is condensed to form fresh water products and enter a fresh water drainage tank; the preheated water that is not vaporized is discharged from a concentrated water drainage tank in the form of concentrated water. The device has small land occupation and low energy consumption, and can realize large fresh water production with few devices, and is suitable for desalination of raw water with high content of dissolved inorganic salts. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0028] Figure 1 It is the overall structure schematic diagram of the pipeline connection of the plate type falling film multi-effect brackish water desalination device;

[0029] Figure 2 It is the external structure schematic diagram of the plate type falling film multi-effect brackish water desalination device;

[0030] Figure 3 It is the sectional view of the plate type falling film multi-effect brackish water desalination device;

[0031] Figure 4is a structural schematic view of the shell;

[0032] Figure 5 is a structural schematic view of the preheater;

[0033] Figure 6 is a structural schematic view of the heating plate cooperating with the first water distributor;

[0034] Figure 7 is a structural schematic view of the water distribution pipe.

[0035] Fig. 1, preheater; 101, raw water flow channel; 111, box body; 112, second water distributor; 1121, sawtooth opening; 2, first water distributor; 21, water distribution pipe; 211, water distribution hole; 22, support; 221, inclined plate; 3, heating plate; 41, upper cover plate; 42, lower cover plate; 43, outer cover; 44, screw rod; 5, concentrated water drainage tank; 6, fresh water drainage tank; 7, partition plate; 8, preheated water tank; 81, pump body; 82, liquid level meter; 9, concentrated water tank; 10, fresh water tank; 11, raw water tank; 12, preheated water drainage tank. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] In the description of the utility model, it needs to be explained that, unless there is definite provision and limitation, the terms "arrange", "install", "connect", "connect" should be understood in broad sense, for example, it can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements. For ordinary skilled in the art, the above-mentioned terms can be understood in the specific meaning in the utility model according to specific circumstances.

[0039] The utility model embodiment provides a kind of plate type falling film multi-effect bitter and salty water desalination device, small floor area, energy consumption is less, in the case where the equipment quantity used is very little, realize the larger of fresh water production, it is applicable to the desalination of high content of dissolved inorganic salt raw water.

[0040] The following will be combined Figures 1-6 The technical scheme provided by the utility model is described in more detail.

[0041] Referring to Figures 1-6 The utility model provides a kind of plate type falling film multi-effect bitter and salty water desalination device, including shell, preheater 1 is fixed in shell, first water distributor 2 and heating plate 3, wherein: there is spacing between preheater 1 and heating plate 3, preheater 1 has raw water flow channel 101, the water outlet of raw water flow channel 101 is connected with the water inlet of first water distributor 2, first water distributor 2 is fixed on the upper portion of corresponding heating plate 3, for the water after preheating in the form of water film along the board surface of heating plate 3 flows down;The bottom of shell is provided with independent concentrated water drainage groove 5 and fresh water drainage groove 6, concentrated water drainage groove 5 and fresh water drainage groove 6 are located between preheater 1 and heating plate 3, and fresh water drainage groove 6 is located close to preheater 1 side, concentrated water drainage groove 5 is close to heating plate 3 side.

[0042] Wherein, first water distributor 2 forms hot end water film after preheating, and water film is formed in the form of water film along the wall surface of heating plate 3, and the water vapor evaporated by water film on heating plate 3 is exchanged with the water film on the inner wall of preheater 1 on the outer wall of preheater 1, releases latent heat, and forms condensate water in the form of bead water.

[0043] The plate type falling film multi-effect brackish water desalination device utilizes a multi-effect distillation method, and after brackish water is preheated by a preheater 1, the brackish water enters a first water distributor 2, preheated water flows through a heating plate 3 in the form of a water film, is heated on the heating plate 3, and in this process, part of the water is vaporized, the vaporized water vapor diffuses to the outer wall of the preheater 1 and the brackish water film of the original water flow channel 101 in the preheater 1 to form heat conduction, improves heat utilization rate, and part of the vaporized water vapor is condensed to form fresh water products and enter a fresh water drainage tank 6; the preheated water that is not vaporized enters a concentrated water drainage tank 5 in the form of concentrated water. The device has small floor area and low energy consumption, and in the case that the amount of equipment used is extremely small, the fresh water production is large, and the device is suitable for desalination of original water with high content of dissolved inorganic salts.

[0044] As an optional embodiment, referring to Figure 4 , the bottom of the shell is fixed with a partition plate 7, and the partition plate 7 is located between the concentrated water drainage tank 5 and the fresh water drainage tank 6. The partition plate 7 separates the concentrated water drainage tank 5 and the fresh water drainage tank 6.

[0045] The original water first enters the preheater 1, exchanges heat with the water vapor, is preheated, and then enters the first water distributor 2, the preheated water flows through the heating plate 3 in the form of a water film, is heated on the heating plate 3, and in this process, part of the water is vaporized, the vaporized water vapor diffuses to the outer wall of the preheater 1 and the brackish water film of the original water flow channel 101 in the preheater 1 to form heat conduction, improves heat utilization rate, and part of the vaporized water vapor is condensed to form fresh water products and enter a fresh water drainage tank 6, since the condensation occurs on the outer wall of the preheater 1, therefore, the fresh water drainage tank 6 is located on the side close to the preheater 1 to facilitate collection of the condensed fresh water. The water flows down from the surface of the heating plate 3, and the preheated water that is not vaporized flows into the concentrated water drainage tank 5 in the form of concentrated water, therefore, the concentrated water drainage tank 5 is arranged on the side close to the heating plate 3.

[0046] As an optional embodiment, referring to Figure 3 and Figure 4 , the preheater 1 is located on the opposite sides of the heating plate 3. In this embodiment, the heating plate 3 is provided with two or more than two, thereby improving the desalination amount of water.

[0047] As an optional embodiment, referring to Figure 1 , Figure 3 and Figure 4 , the preheater 1 is vertically arranged, the inner cavity of the preheater 1 forms the original water flow channel 101, the water inlet of the original water flow channel 101 is communicated with the original water tank 11, the water outlet of the original water flow channel 101 is communicated with the preheated water tank 8, and the water outlet of the preheated water tank 8 is communicated with the water inlet of the first water distributor 2.

[0048] Referring to Figure 1The raw water tank 11 is connected with the corresponding preheater 1 through the water inlet pipeline, and a control valve is arranged on the water inlet pipeline; the preheated water tank 8 is connected with the corresponding first water distributor 2 through the water distribution pipeline, and the preheated water tank 8 is provided with a pump body 81 and a liquid level meter 82, the pump body 81 is connected with the water distribution pipeline, and the liquid level meter 82 is used for detecting the water level in the preheated water tank 8.

[0049] The raw water is distributed from the raw water tank 11 to the corresponding preheater 1, exchanges heat with the water vapor outside the shell, and flows into the preheated water tank 8 after being heated once. The water in the preheated water tank 8 enters the first water distributor 2 under the action of the pump body 81. The liquid level meter 82 is installed in the preheated water tank and is interlocked with the pump body 81. When the liquid level reaches the high alarm value, the pump body 81 stops; when the liquid level is lower than the low alarm liquid level, the pump body 81 restarts.

[0050] As an optional embodiment, referring to Figure 5 The preheater 1 includes a box body 111 and a second water distributor 112, wherein: the inner cavity of the box body 111 is configured as a raw water flow channel 101, the second water distributor 112 is located at the top of the box body 111, and the two ends of the second water distributor 112 are fixedly connected with the box body 111; there is a flow gap between the side of the second water distributor 112 and the inner wall of the box body 111; the second water distributor 112 is in a U-shaped structure, the second water distributor 112 is provided with a sawtooth opening 1121 on the side wall, the sawtooth opening 1121 is communicated with the side wall of the second water distributor 112, and the sawtooth openings 1121 are arranged along the length direction of the second water distributor 112.

[0051] The water in the raw water tank 11 reaches the second water distributor 112 and flows down along the flow gap between the side of the second water distributor 112 and the inner wall of the box body 111. The raw water is laid in the form of a water film on the inner wall of the box body 111, the raw water film exchanges heat with the water vapor outside the box body 111, and is thus preheated, thereby improving the utilization rate of heat and the heat exchange efficiency.

[0052] As an optional embodiment, referring to Figure 6 and Figure 7 The first water distributor 2 includes a water distribution pipe 21 and a support 22, wherein: the support 22 is fixed to the top of the shell, the water distribution pipe 21 penetrates through the support 22, the water distribution pipe 21 is provided with water distribution holes 211, the water distribution holes 211 are arranged along the length direction of the water distribution pipe 21, and the water outlet of the water distribution holes 211 can flow along the surface of the support 22 to the plate surface of the heating plate 3. The support 22 includes an inclined plate 221, the inclined plate 221 is located on the opposite sides of the heating plate 3, the inclined plate 221 is arranged in an inclined manner from top to bottom along the direction towards the heating plate 3, and the lower end of the inclined plate 221 is in contact with the heating plate 3; the water distribution pipe 21 penetrates through the inclined plate 221, and the water distribution pipe 21 extends along the longitudinal direction of the heating plate 3.

[0053] Water in the preheated water tank 8 enters the first water distributor 2 under the action of the pump body 81 and flows out from the water distribution hole 211 of the first water distributor 2. The water flows down along the inclined plate 221 of the support 22 and flows down along the surface of the heating plate 3 in the form of a water film. Since the inclined plate 221 is located on opposite sides of the heating plate 3, the water in the two water distribution pipes 21 can flow down along the two opposite surfaces of the heating plate 3, which improves the heating efficiency.

[0054] Pump body 81 pumps preheated hot water into the water distribution pipe 21 at the upper end of heating plate 3. The water distribution pipe 21 is a flexible hose with an outer diameter of 6mm. A row of water distribution holes 211 with a diameter of 2mm and a spacing of 20mm are opened on the outside of the flexible hose. The water in the pipe can flow out evenly from the first water distributor 2 and flow down evenly from the upper end of heating plate 3, thereby forming a thin water film on the outside of heating plate 3. As the water film flows down, some of the water is heated and evaporated into water vapor. The first water distributor 2 is supported on the upper end of heating plate 3 and kept on the same horizontal line to ensure that the water is discharged evenly from the first water distributor 2.

[0055] As an optional implementation, see Figure 4 As shown, both the concentrate drainage tank 5 and the desalination drainage tank 6 are inclined relative to the horizontal plane, with the drainage ends of the concentrate drainage tank 5 and the desalination drainage tank 6 being the lower ends. (See attached diagram.) Figure 1 As shown, the outlet of the concentrated water drainage tank 5 is connected to the concentrated water tank 9, and the outlet of the fresh water drainage tank 6 is connected to the fresh water tank 10.

[0056] The above structure facilitates the flow of concentrated water into the concentrated water tank 9 along the inclined concentrated water drainage channel 5 under the action of gravity, and facilitates the flow of fresh water into the fresh water tank 10 along the inclined fresh water drainage channel 6 under the action of gravity.

[0057] As an optional implementation, see Figure 2 As shown, the plate-type falling film multi-effect brackish water desalination device includes an upper cover plate 41, a lower cover plate 42, and an outer casing 43. The upper and lower ends of the outer casing 43 are respectively embedded and fixedly connected to the upper cover plate 41 and the lower cover plate 42, and the upper cover plate 41 and the lower cover plate 42 are locked together by screws 44. This improves the stability of the structure. The upper cover plate 41, the lower cover plate 42, and the outer casing 43 are sealed to prevent leakage of water and steam.

[0058] A preheated water drain trough 12 is provided on the lower cover plate 42. The preheated water drain trough 12 is connected to the preheater 1 and is used to quickly discharge preheated water to the preheated water tank 8.

[0059] The temperature probe is fixed on the heating element in the heating plate 3 to detect the temperature of the heating plate 3. The temperature probe is connected to the temperature controller. When the temperature probe of the heating plate 3 reaches the set value, the controller power is turned off and heating stops. When the temperature is lower than the set value, the controller power is turned on and the heating plate 3 continues to heat.

[0060] The plate falling film multi-effect brackish water desalination device of the embodiment has compact structure, each heating plate 3 is adjacent to two preheaters 1, the condensation area of the preheaters 1 is four times of the heating area of the heating plate 3, the area of the two preheaters 1 adjacent to the heating plate 3 is one effect, and the interval between the two preheaters 1 is 26 mm.

[0061] The energy consumption in the process mainly includes the following parts:

[0062] The brackish water becomes preheated water, the brackish water is a cold end, and heat conduction occurs between the brackish water and the evaporated water vapor, the evaporated water vapor releases latent heat and becomes condensed water, becoming fresh water products, and the brackish water absorbs the latent heat of the water vapor and is heated to become preheated water, which is stored in the preheated water tank 8.

[0063] The preheated water becomes water vapor, after the preheated water is heated by the heating plate 3 in the form of a falling film, part of the water absorbs heat and changes into water vapor.

[0064] The preheated water becomes concentrated water, after the preheated water is heated by the heating plate 3 in the form of a falling film, another part of the water is heated and flows out in the form of concentrated water, and the absorbed energy is stored in the concentrated water tank 9 in the form of a certain temperature.

[0065] The fresh water products, the water vapor releasing part of the latent heat, condenses into fresh water, and is stored in the fresh water tank 10 in the form of a certain temperature.

[0066] In addition, the pump body 81 of the preheated water tank consumes part of the energy when lifting the preheated water; the preheated water dissipates heat in the preheated water tank, consuming part of the energy.

[0067] In the description of the present specification, the specific features, structures or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0068] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0069] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A plate-type falling film multi-effect brackish water desalination device, characterized in that, The system includes a housing, within which a preheater, a first water distributor, and a heating plate are fixed, wherein: There is a gap between the preheater and the heating plate. The preheater has a raw water channel. The outlet of the raw water channel is connected to the inlet of the first water distributor. The first water distributor is fixed to the upper part of the corresponding heating plate and is used to make the preheated water flow down the surface of the heating plate in the form of a water film. The bottom of the housing is provided with an independent concentrated water drainage channel and a fresh water drainage channel. The concentrated water drainage channel and the fresh water drainage channel are located between the preheater and the heating plate, with the fresh water drainage channel located closer to the preheater and the concentrated water drainage channel closer to the heating plate.

2. The plate-type falling film multi-effect brackish water desalination device according to claim 1, characterized in that, A partition plate is fixed to the bottom of the shell, and the partition plate is located between the concentrated water drainage tank and the fresh water drainage tank.

3. The plate-type falling film multi-effect brackish water desalination device according to claim 1, characterized in that, The preheaters are located on opposite sides of the heating plate.

4. The plate-type falling film multi-effect brackish water desalination device according to claim 1, characterized in that, The preheater is vertically arranged, and the inner cavity of the preheater forms the raw water channel. The inlet of the raw water channel is connected to the raw water tank, and the outlet of the raw water channel is connected to the preheated water tank. The outlet of the preheated water tank is connected to the inlet of the first water distributor.

5. The plate-type falling film multi-effect brackish water desalination device according to claim 4, characterized in that, The raw water tank is connected to the corresponding preheater through an inlet pipe, and a control valve is installed on the inlet pipe. The preheated water tank is connected to the corresponding first water distributor via a water distribution pipeline. The preheated water tank contains a pump and a level gauge. The pump is connected to the water distribution pipeline, and the level gauge is used to detect the water level in the preheated water tank.

6. The plate-type falling film multi-effect brackish water desalination device according to claim 1, characterized in that, The preheater includes a box body, the inner cavity of which is a raw water flow channel, and a second water distributor is fixed to the top of the box body, with both ends of the second water distributor fixedly connected to the box body. There is a flow gap between the side of the second water distributor and the inner wall of the box body; The second water distributor has a U-shaped structure. The side wall of the second water distributor is provided with a serrated opening. The serrated opening is connected to the upper edge of the side wall of the second water distributor. The serrated opening is arranged at intervals along the length direction of the second water distributor.

7. The plate-type falling film multi-effect brackish water desalination device according to claim 1, characterized in that, The first water distributor includes a water distribution pipe and a support, wherein: The bracket is fixed to the top of the housing, the water distribution pipe passes through the bracket, the water distribution pipe is provided with water distribution holes, the water distribution holes are arranged at intervals along the length of the water distribution pipe, and the water outlet of the water distribution holes can flow along the surface of the bracket to the surface of the heating plate.

8. The plate-type falling film multi-effect brackish water desalination device according to claim 7, characterized in that, The support includes an inclined plate located on opposite sides of the heating plate. The inclined plate is inclined from top to bottom toward the heating plate, and the lower end of the inclined plate is arranged parallel to the heating plate. The water distribution pipe passes through the inclined plate and extends longitudinally along the heating plate.

9. The plate-type falling film multi-effect brackish water desalination device according to claim 8, characterized in that, Both the concentrated water drainage tank and the fresh water drainage tank are inclined relative to the horizontal plane. The drainage end of the concentrated water drainage tank and the fresh water drainage tank is the lower end. The outlet of the concentrated water drainage tank is connected to a concentrated water tank, and the outlet of the fresh water drainage tank is connected to a fresh water tank.

10. The plate-type falling film multi-effect brackish water desalination device according to claim 1, characterized in that, The plate-type falling film multi-effect brackish water desalination device includes an upper cover plate, a lower cover plate, and an outer casing, wherein: The upper and lower ends of the outer cover are respectively embedded and fixedly connected to the upper cover plate and the lower cover plate, and the upper cover plate and the lower cover plate are locked together by screws; A temperature probe is fixed on the heating plate to detect the temperature of the heating plate. The control unit is electrically connected to the temperature probe and is used to control the heating plate to stop heating after the temperature of the heating plate reaches the set value.

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