Falling film evaporation heater

Abstract

The utility model discloses a falling film evaporation heater which comprises a tank body, and a first tube plate and a second tube plate are sequentially arranged in the tank body from top to bottom so as to sequentially divide the tank body into a stock solution cavity, a heating cavity and a backflow cavity from top to bottom; the feeding pipe is arranged on the tank body and is communicated to the stock solution cavity; the first tube plate is provided with a plurality of heating tubes, the inlet ends of the heating tubes are communicated to the stock solution cavity, and the outlet ends of the heating tubes are communicated to the backflow cavity; the film distributing piece is arranged at the inlet end of the heating pipe; and the spraying pipe is arranged in the stock solution cavity, is externally connected with a stock solution pipe and is used for spraying stock solution towards the inner wall of the stock solution cavity. The spray pipe sprays heated stock solution at regular time to wash the inner wall of the stock solution cavity, so that salt scale can be effectively prevented from being generated at the upper part of the tank body, namely the inner wall of the stock solution cavity, and the productivity is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid treatment, and in particular to a falling film evaporation heater. Background Technology

[0002] Falling film evaporators offer significant advantages over other types of evaporators. Through a film distribution device, the material flow within the heat exchange tubes forms a thin film, flowing downwards along the inner wall of the heating tubes due to gravity. Therefore, falling film evaporators boast high evaporation heat transfer coefficients and energy savings. However, in practice, it has been found that when treating wastewater containing substances such as ammonium chloride, some material floats vertically upwards, forming large salt deposits on the upper inner wall of the tank. When the tank shakes, these salt deposits risk detaching and clogging the wastewater flow channels, causing instability in evaporation. Existing solutions typically involve periodic shutdowns to clean the salt deposits, which significantly impacts production capacity. Utility Model Content

[0003] In order to overcome at least one of the defects described in the prior art, the purpose of this utility model is to provide a falling film evaporation heater that can prevent the formation of salt scale on the inner wall of the raw liquid chamber and ensure production capacity.

[0004] A falling film evaporator heater includes: a tank body, wherein a first tube sheet and a second tube sheet are sequentially arranged from top to bottom to divide the tank body into a raw liquid chamber, a heating chamber, and a reflux chamber; a feed pipe disposed in the tank body and connected to the raw liquid chamber; a first tube sheet configured with multiple heating tubes, the inlet end of each heating tube connected to the raw liquid chamber, and the outlet end of each heating tube connected to the reflux chamber; a film-forming component disposed at the inlet end of each heating tube; and a spray pipe disposed within the raw liquid chamber, the spray pipe being externally connected to the raw liquid pipe for spraying raw liquid toward the inner wall of the raw liquid chamber. Here, the spray pipe periodically sprays the heated raw liquid to rinse the inner wall of the raw liquid chamber, thereby effectively preventing scale formation on the upper part of the tank body, i.e., the inner wall of the raw liquid chamber, and ensuring production capacity.

[0005] According to a preferred embodiment, the spray pipe is annular and is sleeved outside the feed pipe, and a plurality of spray heads are arranged on the spray pipe.

[0006] According to a preferred embodiment, the outlet end of the feed pipe is equipped with an anti-impact baffle. The anti-impact baffle can block the raw liquid from the outlet end of the feed pipe to achieve buffering, which can effectively reduce the impact force of the raw liquid on the internal structure of the raw liquid chamber and ensure that the raw liquid enters the heating tube uniformly.

[0007] According to a preferred embodiment, a distribution plate is disposed within the raw liquid chamber, and the distribution plate is located between the feed pipe and the first tube sheet; a plurality of first through holes are provided through the distribution plate, and the first through holes are offset from the inlet end of the heating pipe. This prevents the raw liquid from directly entering the heating pipe through the first through holes.

[0008] According to a preferred embodiment, the inlet end of the heating tube is not higher than the upper surface of the first tube sheet.

[0009] According to a preferred embodiment, the membrane component is frustum-shaped, with its smaller end facing the inlet end of the heating tube.

[0010] According to a preferred embodiment, the inner wall of the inlet end of the heating tube is provided with a film-forming conical surface adapted to the film-forming component, the small end of which is on the same side as the small end of the film-forming component, and the film-forming component is adjustablely disposed inside the heating tube. This allows for adjustment of the gap between the film-forming component and the film-forming conical surface, thereby achieving adjustable liquid film thickness.

[0011] According to a preferred embodiment, a driving component is disposed in the original liquid chamber, and a lead screw is threadedly connected to the fabric membrane component. The driving component is used to drive the lead screw to rotate. A guide rod is disposed on the first tube sheet, and the guide rod is slidably connected to the fabric membrane component.

[0012] According to a preferred embodiment, the membrane component is made of titanium alloy. This effectively prevents corrosion damage to the membrane component and extends its service life.

[0013] According to a preferred embodiment, a plurality of baffles are arranged sequentially from top to bottom inside the heating chamber; adjacent baffles are staggered. The baffles enable the water vapor inside the heating chamber to form turbulence, reduce the flow rate of the water vapor, and ensure sufficient heat exchange between the water vapor and the heating tube. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the falling film evaporator heater provided in an embodiment of the present invention;

[0015] Figure 2 A three-dimensional structural diagram of the spray pipe provided in an embodiment of this utility model;

[0016] Figure 3 A top view of the liquid distribution tray provided in an embodiment of this utility model;

[0017] Figure 4 A top view of the first tube sheet provided in an embodiment of this utility model;

[0018] Figure 5 This is a schematic diagram of the assembly structure of a fabric membrane component provided in one embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the assembly structure of the fabric membrane component provided in another embodiment of the present invention.

[0020] The meanings of the reference numerals in the attached figures are as follows:

[0021] 1. Tank body; 11. Raw liquid chamber; 12. Heating chamber; 13. Reflux chamber; 14. First tube sheet; 141. Fixing rod; 142. Guide rod; 15. Second tube sheet; 16. Steam flange; 17. Overflow pipe; 18. Main reflux pipe; 19. Secondary reflux pipe; 2. Feed pipe; 21. Anti-impact baffle; 3. Liquid distribution plate; 31. First through hole; 32. Protective cover; 33. Motor; 34. Lead screw; 4. Heating tube; 41. Membrane distribution conical surface; 5. Membrane distribution component; 6. Spray pipe; 61. Spray head; 62. Raw liquid pipe; 7. Baffle plate; 71. Support rod. Detailed Implementation

[0022] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] 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.

[0025] Please see Figures 1 to 6A falling film evaporator heater includes a tank body 1, a feed pipe 2, a first tube sheet 14, a film-forming component 5, and a spray pipe 6. The tank body 1 is divided into a raw liquid chamber 11, a heating chamber 12, and a reflux chamber 13 by a first tube sheet 14 and a second tube sheet 15 arranged sequentially from top to bottom. The feed pipe 2 is located in the tank body 1 and connects to the raw liquid chamber 11. The first tube sheet 14 is equipped with multiple heating tubes 4, with the inlet end of each heating tube 4 connected to the raw liquid chamber 11 and the outlet end connected to the reflux chamber 13. The film-forming component 5 is located at the inlet end of each heating tube 4. The spray pipe 6 is located inside the raw liquid chamber 11 and is externally connected to a raw liquid pipe 62 for spraying raw liquid towards the inner wall of the raw liquid chamber 11. Figure 1 As shown, during use, the waste liquid, i.e. the raw liquid, enters the raw liquid chamber 11 for pretreatment through the feed pipe 2, and then enters the heating chamber 12 area through the heating pipe 4 for heating and evaporation. After heating and evaporation, the raw liquid flows into the return chamber 13 and then back into the raw liquid chamber 11 for the next heating and evaporation cycle to further improve the heating and evaporation effect of the waste liquid. During this process, the heated raw liquid is sprayed at regular intervals through the spray pipe 6 to rinse the inner wall of the raw liquid chamber 11, thereby effectively preventing the formation of salt scale on the upper part of the tank 1, i.e. the inner wall of the raw liquid chamber 11, and ensuring production capacity.

[0026] like Figure 2 As shown, optionally, the tank body 1 is a hollow cylinder. Optionally, the spray pipe 6 is annular to fit the shape of the tank body 1. The spray pipe 6 is sleeved outside the feed pipe 2, and a plurality of spray heads 61 are arranged on the spray pipe 6. The plurality of spray heads 61 are evenly arranged on the spray pipe 6 to achieve uniform spraying of the inner wall of the raw liquid chamber 11.

[0027] In this embodiment, the raw liquid pipe 62 penetrates the tank 1 and connects to the raw liquid storage area to guide the raw liquid to the spray pipe 6. Preferably, the raw liquid pipe 62 is equipped with a heater (not shown in the figure) to preheat the raw liquid entering the spray pipe 6, so as to better spray and remove any salt scale that may exist on the raw liquid chamber 11.

[0028] like Figure 1 As shown, an anti-impact baffle 21 is provided at the outlet end of the feed pipe 2. It should be noted that there is a sufficient gap between the anti-impact baffle 21 and the outlet end of the feed pipe to ensure the flow rate of the raw liquid in the feed pipe 2. The anti-impact baffle 21 here can block the raw liquid from the outlet end of the feed pipe 2 to achieve buffering, effectively reducing the impact force of the raw liquid on the internal structure of the raw liquid chamber 11, and more specifically, effectively preventing uneven entry of the raw liquid into the heating tube 4.

[0029] Furthermore, such as Figure 1 and Figure 3As shown, a liquid distribution plate 3 is disposed inside the raw liquid chamber 11, and the liquid distribution plate 3 is located between the feed pipe 2 and the first tube sheet 14. Several first through holes 31 are provided through the liquid distribution plate 3, and the first through holes 31 are offset from the inlet end of the heating tube 4. In use, the raw liquid is dispersed at the anti-impact baffle 21 and flows evenly to the liquid distribution plate 3. After flowing through the first through holes 31 to the upper surface of the first tube sheet 14, it flows into the heating tube 4. By offsetting the first through holes 31 from the inlet end of the heating tube 4, the raw liquid passing through the first through holes 31 cannot directly enter the heating tube 4. Instead, it first reaches the upper surface of the first tube sheet 14 and then enters the heating tube 4, so as to ensure that the raw liquid entering multiple heating tubes 4 is uniform. The raw liquid entering the heating tube 4 flows to the film distribution member 5. Under the action of gravity, it passes through the gap between the film distribution member 5 and the heating tube 4, so that the raw liquid forms a continuous liquid film on the inner wall of the heating tube 4.

[0030] Preferably, the inlet end of the heating tube 4 is not higher than the upper surface of the first tube sheet 14. This arrangement facilitates the smooth entry of the raw liquid on the first tube sheet 14 into the heating tube 4.

[0031] Furthermore, such as Figure 1 As shown, the tank body 1 is equipped with a steam flange 16, which is connected to external steam for heating the heating pipe 4. Here, the steam flange 16 is connected to the heating chamber 12.

[0032] like Figure 5 As shown, the membrane element 5 is frustum-shaped, with its smaller end facing the inlet end of the heating tube 4. In this embodiment, the frustum-shaped membrane element 5 is advantageous for forming a stable liquid film with the inner wall of the heating tube 4.

[0033] Optionally, such as Figure 5 As shown, the membrane component 5 is installed on the first tube sheet 14 via a fixing rod 141.

[0034] In another embodiment, the inner wall of the inlet end of the heating tube 4 is provided with a cloth film conical surface 41 adapted to the cloth film component 5, the small end of which is on the same side as the small end of the cloth film component 5, and the cloth film component 5 is adjustablely disposed inside the heating tube 4. Figure 6 As shown, the vertical height of the film-making component 5 is adjustable, thereby adjusting the gap between the film-making component 5 and the conical surface 41 of the film-making component, thus achieving adjustable thickness of the liquid film.

[0035] Specifically, a protective cover 32 is provided on the liquid distribution tray 3, and a motor 33 is arranged inside the protective cover 32. A lead screw 34 is driven and connected to the output shaft of the motor 33. The lead screw 34 passes through the liquid distribution tray 3 and is threadedly connected to the film distribution piece 5. A guide rod 142 is provided on the first tube plate 14. The parallel section of the guide rod 142 and the lead screw 34 passes through the film distribution piece 5 and is slidably connected to it. Here, the protective cover 32 is used to protect the motor 33. The motor 33 drives the lead screw 34 to rotate, so as to adjust the longitudinal position of the film distribution piece 5 threadedly connected to the lead screw 34 in the heating tube 4. The parallel section of the guide rod 142 is used to guide the film distribution piece 5 to prevent it from rotating circumferentially during the driving process of the lead screw 34.

[0036] Preferably, the membrane component 5 is made of titanium alloy. This improves the corrosion resistance of the membrane component 5.

[0037] It should be noted that the inner diameter of the small end of the membrane conical surface 41 is larger than the outer diameter of the large end of the membrane component 5. This design facilitates the assembly of the membrane component 5 within the heating tube 4.

[0038] like Figure 1 As shown, multiple baffles 7 are arranged sequentially from top to bottom inside the heating chamber 12. Optionally, the baffles 7 are fixedly mounted to the inner wall of the heating chamber 12, or fixed by a support rod 71 provided on the second tube sheet 15. It should be noted that the baffles 7 located in the extension path of the heating tube 4 are penetrated by the heating tube 4.

[0039] Preferably, two adjacent baffles 7 are staggered. Here, the baffles 7 can help fix the heating tube 4. At the same time, when water vapor enters the heating chamber 12, it forms turbulence under the action of the baffles 7, which can reduce the flow rate of water vapor, thereby ensuring the heat exchange time between water vapor and heating tube 4 and ensuring the heating efficiency of heating tube 4.

[0040] In this embodiment, as Figure 1 As shown, the tank 1 is equipped with an overflow pipe 17. One end of the overflow pipe 17 is connected to the return chamber 13, and the other end is connected to the separator (not shown in the figure) to separate the treated raw liquid into gas and liquid.

[0041] The bottom of the tank 1 is provided with a main reflux pipe 18 and a secondary reflux pipe 19. One end of the main reflux pipe 18 is connected to the reflux chamber 13, and the other end is connected to the feed pipe 2. One end of the secondary reflux pipe 19 is connected to the main reflux pipe 18, and the other end is connected to the outlet of the separator, so as to return the liquid part after gas-liquid separation to participate in the next heating cycle.

[0042] The tank body 1 is equipped with two exhaust pipes, both of which are connected to the heating chamber 12 and are both longitudinally lower than the steam flange 16. The one of the two exhaust pipes closer to the steam flange 16 is used to discharge water vapor, and the one farther away from the steam flange 16 is used to discharge condensate.

[0043] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A falling film evaporator heater characterized by, The application relates to a kind of liquid heating device, including: Tank body (1), first tube plate (14) and second tube plate (15) are sequentially arranged in the tank body (1) from top to bottom, to divide the tank body (1) into raw liquid cavity (11), heating cavity (12) and reflux cavity (13) from top to bottom sequentially; Feed pipe (2) is arranged in the tank body (1) and is communicated to the raw liquid cavity (11); First tube plate (14) is configured with a plurality of heating pipes (4), the inlet end of the heating pipe (4) is communicated to the raw liquid cavity (11), and the outlet end of the heating pipe (4) is communicated to the reflux cavity (13); Membrane distribution element (5) is arranged at the inlet end of the heating pipe (4); And Spray pipe (6) is arranged in the raw liquid cavity (11), and the spray pipe (6) is connected with raw liquid pipe (62) outside, for spraying raw liquid towards the inner wall of the raw liquid cavity (11).

2. The falling film evaporative heater of claim 1, wherein The spray pipe (6) is annular, the spray pipe (6) is sleeved outside the feed pipe (2), and a plurality of spray heads (61) are arranged on the spray pipe (6).

3. The falling film evaporative heater of claim 1, wherein, The outlet end of the feed pipe (2) is provided with an anti-impact baffle (21).

4. The falling film evaporative heater of claim 1, wherein, The raw liquid cavity (11) is provided with a liquid distribution disc (3), and the liquid distribution disc (3) is between the feed pipe (2) and the first tube plate (14); A plurality of first through holes (31) are arranged through the liquid distribution disc (3), and the first through holes (31) are arranged in a staggered manner with the inlet end of the heating pipe (4).

5. The falling film evaporative heater according to claim 1, wherein The inlet end of the heating pipe (4) is not higher than the upper surface of the first tube plate (14).

6. The falling film evaporative heater according to claim 1, wherein The membrane distribution element (5) is in the shape of a circular truncated cone, and the small end of the membrane distribution element (5) is arranged towards the side of the inlet end of the heating pipe (4).

7. The falling film evaporative heater according to claim 6, characterized in that The inner wall of the inlet end of the heating pipe (4) is provided with a membrane distribution conical surface (41) matched with the membrane distribution element (5), and the small end of the membrane distribution conical surface (41) is on the same side as the small end of the membrane distribution element (5), and the membrane distribution element (5) is adjustably arranged in the heating pipe (4).

8. The falling film evaporative heater according to claim 7, characterized in that A driving element is arranged in the raw liquid cavity (11), a lead screw (34) is threadedly connected to the membrane distribution element (5), and the driving element is used for driving the lead screw (34) to rotate; a guide rod (142) is arranged on the first tube plate (14), and the guide rod (142) is slidably connected with the membrane distribution element (5).

9. The falling film evaporative heater according to claim 1, wherein The membrane distribution element (5) is made of titanium alloy.

10. The falling film evaporative heater according to claim 1, wherein A plurality of baffles (7) are sequentially arranged in the heating cavity (12) from top to bottom; and adjacent two baffles (7) are arranged in a staggered manner.

Images