Falling film evaporator

Abstract

The utility model discloses a falling film evaporator which comprises an evaporator shell, a shunting assembly and a heating assembly, the shunting assembly is installed in the evaporator shell below a feeding port, and the heating assembly is communicated with the side wall of the upper section of the evaporator shell; the heating assembly comprises a main steam inlet pipe, the side wall of the main steam inlet pipe communicates with one end of an auxiliary pipeline, the other end of the auxiliary pipeline penetrates through the side wall of the evaporator shell and then communicates with a branch pipe, the upper end and the lower end of the branch pipe communicate with circular ring pipes, and the inner walls of the circular ring pipes communicate with steam nozzles. The problems that in the prior art, in the using process of an evaporator, heating steam is injected into an evaporator shell through a steam opening and used in cooperation with evaporation cylinders, but due to the fact that the evaporation cylinders need to be densely arranged in the evaporator shell, the heating steam cannot be rapidly and fully diffused after being injected, and the heat transfer efficiency of feed liquid is reduced are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, and more specifically, to a falling film evaporator. Background Art

[0002] Falling film evaporation is to add the feed liquid from the upper tube box of the heating chamber of the falling film evaporator, and through the liquid distribution and film forming device, evenly distribute it into each heat exchange tube. Under the action of gravity, vacuum induction and air flow, it flows downwards in a uniform film shape.

[0003] It is found that a falling film evaporator disclosed in the publication number: CN205759772U discloses "including a shell, a dispersion plate and evaporation tubes; the upper and lower ends of the shell are provided with a feed pipe and a discharge pipe, and the left and right sides of the shell are provided with a steam port and a condensation port; the dispersion plate is arranged inside the shell and is located below the feed pipe; the evaporation tubes are vertically arranged at the bottom side of the dispersion plate, and the evaporation tubes include an evaporation cylinder, a jacket and a flow dividing plate. The jacket is arranged outside the evaporation cylinder, and the flow dividing plate is arranged on the central axis of the evaporation cylinder. It has the advantages of stable and reliable operation, wide viscosity treatment range, suitable for large flow operation, wide application range and high evaporation efficiency".

[0004] However, the above falling film evaporator has the following disadvantages:

[0005] 1. During the use of the evaporator in this patent, the heating steam is injected into the evaporator shell through the steam port and used in cooperation with the evaporation cylinder. However, since the evaporation cylinders need to be densely arranged in the evaporator shell, the heating steam cannot be quickly and fully diffused after being injected, reducing the heat transfer efficiency of the feed liquid.

[0006] To solve the above problems, a falling film evaporator is proposed in this application. Summary of the Utility Model

[0007] Aiming at the problems in the related art, the utility model provides a falling film evaporator, which can quickly and fully diffuse the heating steam to the entire evaporation chamber and improve the heat transfer efficiency of the feed liquid.

[0008] For this purpose, the specific technical solution adopted by the utility model is as follows:

[0009] A falling film evaporator includes an evaporator shell, a flow dividing component and a heating component. The top of the evaporator shell is communicated with a feed port. Inside the evaporator shell below the feed port, a flow dividing component is installed. Below the flow dividing component, a heat exchange tube device used in cooperation with it is installed. The upper section side wall of the evaporator shell is communicated with a heating component;

[0010] The heating component includes a main steam inlet pipe. One end of an auxiliary pipe is communicated with the side wall of the main steam inlet pipe. The other end of the auxiliary pipe penetrates through the side wall of the evaporator housing and is communicated with a branch pipe. Both the upper and lower ends of the branch pipe are communicated with an annular pipe, and steam nozzles are communicated with the inner wall of the annular pipe.

[0011] As a further scheme of the present utility model, a steam condensate outlet is communicated with the left side wall of the lower section of the evaporator housing, and one end of a gas phase channel is communicated with the right side wall of the lower section of the evaporator housing.

[0012] As a further scheme of the present utility model, the other end of the gas phase channel is communicated with a separator, and a gas phase outlet is communicated with the top end of the separator.

[0013] As a further scheme of the present utility model, a first concentrate outlet is communicated with the middle of the bottom end of the separator, and support legs are also installed on the bottom wall of the separator.

[0014] As a further scheme of the present utility model, a second concentrate outlet is communicated with the middle of the bottom end of the evaporator housing, and support columns are installed on the bottom wall of the evaporator housing.

[0015] As a further scheme of the present utility model, the flow splitting component includes a first flow splitting plate, which is installed in the inner cavity of the evaporator housing below the feed inlet, and a flow guiding plate is installed in the middle of the first flow splitting plate.

[0016] As a further scheme of the present utility model, a second flow splitting plate which is matched with the first flow splitting plate is installed below the first flow splitting plate, and the second flow splitting plate is matched with the heat exchange tube device below.

[0017] The beneficial effects of the present utility model are as follows:

[0018] In the present utility model, through the cooperation of the evaporator housing, the flow splitting component, the heating component and the heat exchange tube device, during use, the product enters the inner cavity of the evaporator housing from the feed inlet, and then flows into the heat exchange tube device after passing through the first flow splitting plate and the second flow splitting plate. During this process, a part of the heating steam enters the evaporation chamber through the main steam inlet pipe, and another part of the heating steam enters the annular pipe through the auxiliary pipe and the branch pipe, and then sprays out from the steam nozzles, so that the heating steam can be quickly and timely diffused to the periphery of the heat exchange tube device, thereby enabling the heating steam to be quickly and fully diffused to the entire evaporation chamber when the evaporator is in use, and improving the heat transfer efficiency of the liquid material. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic diagram of the overall structure of a falling film evaporator according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the cooperation of the flow splitting component, heating component and heat exchange tube device of a falling film evaporator according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the structure of a partial heating component of a falling film evaporator according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the heat exchange tube device of a falling film evaporator according to an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the cross-sectional structure of the second flow splitting plate of a falling film evaporator according to an embodiment of the present invention.

[0025] In the figure:

[0026] 1. Evaporator shell; 2. Flow splitting component; 201. First flow splitting plate; 202. Deflector; 203. Second flow splitting plate; 3. Heating component; 4. Feed inlet; 5. Heat exchange tube device; 6. Main steam inlet pipe; 7. Auxiliary pipeline; 8. Branch pipe; 9. Ring pipe; 10. Steam nozzle; 11. Steam condensate outlet; 12. Gas phase channel; 13. Separator; 14. Gas phase outlet; 15. First concentrate outlet; 16. Second concentrate outlet. Specific embodiments

[0027] To further illustrate the embodiments, the present invention provides drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0028] According to an embodiment of the present invention, a falling film evaporator is provided.

[0029] Please refer to the attached drawings of the specification Figures 1-5, A falling film evaporator according to an embodiment of the present utility model includes an evaporator housing 1, a flow splitting assembly 2, and a heating assembly 3. The top of the evaporator housing 1 is connected to a feed inlet 4. Inside the evaporator housing 1 below the feed inlet 4, a flow splitting assembly 2 is installed. Below the flow splitting assembly 2, a heat exchange tube device 5 used in cooperation therewith is installed. On the upper side wall of the evaporator housing 1, a heating assembly 3 is connected. The heating assembly 3 includes a main steam inlet pipe 6. One end of an auxiliary pipeline 7 is connected to the side wall of the main steam inlet pipe 6. The other end of the auxiliary pipeline 7 passes through the side wall of the evaporator housing 1 and is connected to a branch pipe 8. Both the upper and lower ends of the branch pipe 8 are connected to an annular pipe 9. And steam nozzles 10 are connected to the inner wall of the annular pipe 9. In the middle of the bottom end of the evaporator housing 1, a second concentrate outlet 16 is connected. And support columns are installed on the bottom wall of the evaporator housing 1. On the left side wall of the lower section of the evaporator housing 1, a steam condensate outlet 11 is connected. On the right side wall of the lower section of the evaporator housing 1, one end of a gas phase channel 12 is connected. The other end of the gas phase channel 12 is connected to a separator 13. The top of the separator 13 is connected to a gas phase outlet 14. In the middle of the bottom end of the separator 13, a first concentrate outlet 15 is connected. And support legs are also installed on the bottom wall of the separator 13. By the cooperation of the evaporator housing 1, the flow splitting assembly 2, the heating assembly 3, and the heat exchange tube device 5, during use, the product enters the inner cavity of the evaporator housing 1 from the feed inlet 4, and then flows into the heat exchange tube device 5 after passing through the first flow splitting plate 201 and the second flow splitting plate 203. During this process, part of the heating steam enters the evaporation chamber through the main steam inlet pipe 6, and another part of the heating steam enters the annular pipe 9 through the auxiliary pipeline 7 and the branch pipe 8, and then sprays out from the steam nozzles 10, which can quickly and timely diffuse the heating steam to the periphery of the heat exchange tube device 5, so that when this evaporator is used, the heating steam can be quickly and fully diffused to the entire evaporation chamber, improving the heat transfer efficiency of the liquid material.

[0030] In one embodiment, please refer to the accompanying drawings of the specification Figure 2 and Figure 5 , As a further solution of the present utility model, the flow splitting assembly 2 includes a first flow splitting plate 201. The first flow splitting plate 201 is installed in the inner cavity of the evaporator housing 1 below the feed inlet 4. And a flow guiding plate 202 is installed in the middle of the first flow splitting plate 201. Below the first flow splitting plate 201, a second flow splitting plate 203 used in cooperation therewith is installed. The second flow splitting plate 203 is used in cooperation with the heat exchange tube device 5 below. During use, the product first falls onto the flow guiding plate 202, and then flows onto the first flow splitting plate 201. After passing through the through holes, it flows into the through holes on the second flow splitting plate 203, and then falls into the heat exchange tube device 5 below the second flow splitting plate 203.

[0031] Workflow: When in use, the product enters the inner cavity of the evaporator housing 1 from the feed inlet 4, and then flows into the heat exchange tube device 5 after passing through the first diverter plate 201 and the second diverter plate 203. During this process, part of the heating steam enters the evaporation chamber through the main steam inlet pipe 6, and another part of the heating steam enters the circular pipe 9 through the auxiliary pipeline 7 and the branch pipe 8, and then sprays out from the steam nozzle 10, which can quickly and timely diffuse the heating steam to the periphery of the heat exchange tube device 5. Then the product flows down along the inner wall of the heat exchange tube in a uniform film shape in the heat exchange tube device 5. During this process, it is heated and vaporized, and then enters the separator 13 through the gas phase channel 12.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A falling film evaporator, comprising an evaporator housing (1), a flow splitting assembly (2) and a heating assembly (3), characterized in that: The top end of the evaporator housing (1) is communicated with a feed inlet (4). Inside the evaporator housing (1) below the feed inlet (4), a flow splitting component (2) is installed. Below the flow splitting component (2), a heat exchange tube device (5) used in cooperation therewith is installed. On the upper side wall of the evaporator housing (1), a heating component (3) is communicated. The heating component (3) includes a main steam inlet pipe (6). One end of an auxiliary pipeline (7) is communicated with the side wall of the main steam inlet pipe (6). The other end of the auxiliary pipeline (7) penetrates through the side wall of the evaporator housing (1) and is communicated with a branch pipe (8). Both the upper and lower ends of the branch pipe (8) are communicated with an annular pipe (9), and steam nozzles (10) are communicated with the inner wall of the annular pipe (9).

2. The falling film evaporator according to claim 1, wherein: On the left side wall of the lower section of the evaporator housing (1), a steam condensate outlet (11) is communicated. One end of a gas phase channel (12) is communicated with the right side wall of the lower section of the evaporator housing (1).

3. A falling film evaporator according to claim 2, characterized in that: The other end of the gas phase channel (12) is communicated with a separator (13). The top end of the separator (13) is communicated with a gas phase outlet (14).

4. A falling film evaporator according to claim 3, characterized in that: In the middle of the bottom end of the separator (13), a first concentrate outlet (15) is communicated, and support legs are also installed on the bottom wall of the separator (13).

5. A falling film evaporator according to claim 1, characterized in that: In the middle of the bottom end of the evaporator housing (1), a second concentrate outlet (16) is communicated, and support columns are installed on the bottom wall of the evaporator housing (1).

6. A falling film evaporator according to claim 1, characterized in that: The flow splitting component (2) includes a first flow splitting plate (201). The first flow splitting plate (201) is installed in the inner cavity of the evaporator housing (1) below the feed inlet (4), and a guide plate (202) is installed in the middle of the first flow splitting plate (201).

7. A falling film evaporator according to claim 6, characterized in that: Below the first flow splitting plate (201), a second flow splitting plate (203) used in cooperation therewith is installed. The second flow splitting plate (203) is used in cooperation with the heat exchange tube device (5) below.

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