Tubular falling film evaporator

Abstract

The invention belongs to the technical field of aluminum oxide production equipment, and particularly relates to a tubular falling film evaporator. The tubular falling film evaporator comprises: a body; the upper tube plate is arranged in the body; the plurality of heating tubes are arranged in the body and penetrate through the upper tube plate; the material buffer is communicated with the liquid inlet of the body; the film distributor is arranged in the body and connected with the upper tube plate, and the film distributor is located between the upper tube plate and the material buffer; the plurality of forced material distributors are arranged in the body and correspond to the plurality of heating pipes one by one, the forced material distributors are positioned above the corresponding heating pipes, the projections of the forced material distributors on the body are overlapped with the projections of the corresponding heating pipes on the body along the axial direction of the body, and the forced material distributors are positioned between the upper pipe plate and the film distributor.

Description

Technical Field

[0001] This application belongs to the technical field of alumina production equipment, and particularly relates to a tubular falling film evaporator. Background Art

[0002] The falling film evaporator is the main production equipment in the evaporation process. The amount of steam evaporated and steam consumption have an important impact on energy conservation and consumption reduction in alumina production. During the normal operation of the evaporator, there are problems of high temperature, high pressure, and high alkali concentration in the evaporator. Scaling forms on the inner surface of the heating tubes. At the same time, the heating tubes are extremely prone to shear fracture under conditions such as mechanical alkali quenching, evaporation of high sulfur-containing impurities, and after pickling. Therefore, the problems of scaling and leakage of the heating tubes are relatively common, seriously affecting the most important economic indicators such as steam consumption and evaporation capacity of the evaporator, and at the same time reducing the production operation cycle of the evaporator.

[0003] By studying the operating conditions inside the solution tubes and based on the design of the film distributors and heating tubes of the currently used evaporators, from the perspective of the principle of fluid motion, it can be determined that there are more or less phenomena of interrupted flow, uneven flow, and full flow in the heating tubes of each evaporator, resulting in reduced heat transfer efficiency and affecting the service life of the heating tubes. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a tubular falling film evaporator, aiming to at least solve to a certain extent the technical problems of reduced heat transfer efficiency of the falling film evaporator and affecting the service life of the heating tubes.

[0005] The technical solution of the present invention is as follows:

[0006] A tubular falling film evaporator, comprising: a main body; an upper tube sheet disposed inside the main body; a plurality of heating tubes disposed inside the main body and passing through the upper tube sheet; a material buffer connected to the liquid inlet of the main body; a film distributor disposed inside the main body and connected to the upper tube sheet, the film distributor being located between the upper tube sheet and the material buffer; a plurality of material forced distributors disposed inside the main body and corresponding to the plurality of heating tubes one by one, the material forced distributors being located above the corresponding heating tubes, and along the axial direction of the main body, the projection of the material forced distributor on the main body overlaps with the projection of the corresponding heating tube on the main body, and the material forced distributor is located between the upper tube sheet and the film distributor.

[0007] In some embodiments, along the axial direction of the main body, the liquid inlet of the heating tube is spaced from the upper tube sheet.

[0008] In some embodiments, along the axial direction of the main body, the material forced distributor is spaced from the corresponding heating tube.

[0009] In some embodiments, the material forced distributor includes: a cylinder, which corresponds to the multiple heating tubes one by one and is located above the corresponding heating tubes, along the axial direction of the body, the projection of the cylinder on the body overlaps with the projection of the corresponding heating tube on the body, and the cylinder is located between the upper tube plate and the film distributor; an adjusting member, connected to the end of the cylinder away from the heating tube.

[0010] In some embodiments, the tubular falling film evaporator further comprises a plurality of first support members; one end of each of the first support members is connected to the main body, and the other end is passed through the cylinders of the plurality of material forced distributors and connected to the main body; wherein the adjusting member is passed through the cylinders and conflicts with the first support members.

[0011] In some embodiments, the material buffer includes: a connecting pipe connected to the liquid inlet of the body; and guide blades disposed in the connecting pipe and arranged in a spiral shape.

[0012] In some embodiments, the tubular falling film evaporator further includes: a liquid infusion pipe connected to the connecting pipe and the liquid outlet of the body; and a material circulation pump disposed on the liquid infusion pipe.

[0013] In some embodiments, the diameter of the connecting tube is larger than the diameter of the infusion tube.

[0014] In some embodiments, the film spreader includes: a plurality of orifice plates disposed in the body and between the upper tube plate and the material buffer, wherein the plurality of orifice plates are spaced apart along the axial direction of the body; a second support member connected to two adjacent orifice plates; and a third support member, one end of which is connected to the upper tube plate, and the other end of which is connected to the orifice plate closest to the upper tube plate among the plurality of orifice plates.

[0015] In some embodiments, the areas of the plurality of orifice plates decrease along a direction from the material buffer to the upper tube plate.

[0016] The beneficial effects of the present invention include at least:

[0017] Since the upper tube sheet is arranged in the body, the upper tube sheet is supported by the body. Since multiple heating tubes are arranged in the body and penetrate the upper tube sheet, the stability of the installation of multiple heating tubes can be ensured by the upper tube sheet. Since the material buffer is connected to the liquid inlet of the body, the film distributor is arranged in the body and connected to the upper tube sheet, and the film distributor is located between the upper tube sheet and the material buffer, the material buffer can buffer the liquid material entering the body to reduce the impact force of the liquid material and ensure the safety of the film distributor. The liquid buffered by the material buffer reaches the film distributor, and the liquid material can be evenly distributed to the upper tube sheet through the film distributor.

[0018] Due to multiple material forced distributors provided inside the body and corresponding to the multiple heating tubes one by one, with the material forced distributors located above the corresponding heating tubes, along the axial direction of the body, the projection of the material forced distributor on the body overlaps with the projection of the corresponding heating tube on the body, and the material forced distributors are located between the upper tube sheet and the film distributor. Therefore, after the liquid material passes through the film distributor, it will fall onto the material forced distributor, and the corresponding heating tube is blocked by the material forced distributor to prevent the liquid material from directly entering the heating tube, forcing the liquid material to change its running path. The liquid material will accumulate on the upper tube sheet until the liquid level of the liquid material on the upper tube sheet exceeds the liquid inlet of the heating tube, and the liquid material enters the heating tube through overflow. The liquid material is forced to flow uniformly downward along the inner wall of the heating tube and will not enter the center of the heating tube, achieving the effect of forced film formation, forcing the material to change its running path, enabling a liquid film to exist in each heating tube, approaching the ideal liquid film flow state, improving the heat transfer efficiency of the heating tube, and enabling the scale to adhere more evenly to the inner surface of the heating tube. The liquid film can add a protective layer for the iron of the heating tube during pickling, extend the service life of the heating tube, can increase the evaporation capacity of the evaporator and reduce the steam consumption, and reduce the cost. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Structural schematic diagram of a tubular falling film evaporator for some embodiments;

[0021] Figure 2 Schematic diagram of the ideal liquid film flow state inside the heating tube of a tubular falling film evaporator for some embodiments;

[0022] Figure 3 For Figure 1 Structural schematic diagram of the material buffer of the tubular falling film evaporator in

[0023] Figure 4 For Figure 1 Structural schematic diagram of the material forced distributor of the tubular falling film evaporator in

[0024] In the drawings:

[0025] Body 10;

[0026] Upper tube sheet 20;

[0027] Heating tube 30;

[0028] Material buffer 40, connecting pipe 41, guide vane 42;

[0029] Film distributor 50, orifice plate 51, second support member 52, third support member 53;

[0030] Material forced distributor 60, cylinder 61, adjusting member 62, through hole 63;

[0031] First support member 70;

[0032] Infusion tube 80;

[0033] Material circulation pump 90. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0035] It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0036] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" can explicitly or implicitly include at least one of these features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0038] Next, the present application will be described in conjunction with the accompanying drawings and with reference to specific embodiments:

[0039] A tubular falling film evaporator provided in this embodiment aims to at least solve to some extent the technical problems that the heat transfer efficiency of the falling film evaporator is reduced and the service life of the heating tubes is affected.

[0040] Figure 1 It is a schematic structural diagram of a tubular falling film evaporator of some embodiments; Figure 2 It is a schematic diagram of an ideal liquid film flow state inside the heating tube of a tubular falling film evaporator of some embodiments. Combining Figure 1 and Figure 2 , the tubular falling film evaporator of the embodiment of the present application includes: a main body 10, an upper tube sheet 20, heating tubes 30, a material buffer 40, a film distributor 50, and a material forced distributor 60. The upper tube sheet 20 is arranged inside the main body 10. A plurality of heating tubes 30 are arranged inside the main body 10 and penetrate through the upper tube sheet 20. The material buffer 40 is communicated with the liquid inlet of the main body 10. The film distributor 50 is arranged inside the main body 10 and is connected to the upper tube sheet 20. The film distributor 50 is located between the upper tube sheet 20 and the material buffer 40. A plurality of material forced distributors 60 are arranged inside the main body 10 and correspond to the plurality of heating tubes 30 one by one. The material forced distributor 60 is located above the corresponding heating tube 30. Along the axial direction of the main body 10, the projection of the material forced distributor 60 on the main body 10 overlaps with the projection of the corresponding heating tube 30 on the main body 10. The material forced distributor 60 is located between the upper tube sheet 20 and the film distributor 50.

[0041] The tubular falling film evaporator can be an integral tubular falling film evaporator or a split tubular falling film evaporator. The integral tubular falling film evaporator has the heating chamber and the separation chamber for separating steam and liquid designed coaxially up and down. The split tubular falling film evaporator has the heating chamber and the separation chamber designed separately and independently.

[0042] Since the upper tube sheet 20 is arranged inside the main body 10, the upper tube sheet 20 is supported by the main body 10. Since a plurality of heating tubes 30 are arranged inside the main body 10 and penetrate through the upper tube sheet 20, the stability of the installation of the plurality of heating tubes 30 can be ensured by the upper tube sheet 20. Since the material buffer 40 is communicated with the liquid inlet of the main body 10, the film distributor 50 is arranged inside the main body 10 and is connected to the upper tube sheet 20, and the film distributor 50 is located between the upper tube sheet 20 and the material buffer 40, the material buffer 40 can buffer the liquid material entering the main body 10 to reduce the impact force of the liquid material and ensure the safety of the film distributor 50. The liquid after being buffered by the material buffer 40 reaches the film distributor 50, and the liquid material can be evenly distributed to the upper tube sheet 20 through the film distributor 50.

[0043] Due to multiple material forced distributors 60 disposed within the main body 10 and corresponding one-to-one with multiple heating tubes 30, the material forced distributors 60 are located above the corresponding heating tubes 30. Along the axial direction of the main body 10, the projection of the material forced distributor 60 on the main body 10 overlaps with the projection of the corresponding heating tube 30 on the main body 10. The material forced distributor 60 is located between the upper tube sheet 20 and the film distributor 50. Therefore, after the liquid material passes through the film distributor 50, it will fall onto the material forced distributor 60, and the material forced distributor 60 blocks the corresponding heating tube 30 to prevent the liquid material from directly entering the heating tube 30, forcing the liquid material to change its running path. The liquid material will accumulate on the upper tube sheet 20 until the liquid level of the liquid material on the upper tube sheet 20 exceeds the liquid inlet of the heating tube 30, and the liquid material enters the heating tube 30 through overflow. The liquid material is forced to flow uniformly downward along the inner wall of the heating tube 30 and will not enter the center of the heating tube 30, achieving the effect of forced film formation, forcing the material to change its running path, so that there is a liquid film in each heating tube 30, approaching the ideal liquid film flow state, improving the heat transfer efficiency of the heating tube 30, and enabling the scale to adhere more evenly to the inner surface of the heating tube 30. The liquid film can add a protective layer for the iron of the heating tube 30 during pickling, extending the service life of the heating tube 30, increasing the evaporation amount of the evaporator and reducing the steam consumption, and reducing the cost.

[0044] Combined with Figure 1 , in some embodiments, to prevent the liquid material on the upper tube sheet 20 from directly entering the heating tube 30, along the axial direction of the main body 10, the liquid inlet of the heating tube 30 is spaced from the upper tube sheet 20. It can be understood that the liquid inlet of the heating tube 30 extends out of the upper tube sheet 20 so that the liquid level of the liquid material on the upper tube sheet 20 exceeds the liquid inlet of the heating tube 30, and the liquid material enters the heating tube 30 through overflow. The liquid material is forced to flow uniformly downward along the inner wall of the heating tube 30 and will not enter the center of the heating tube 30, achieving the effect of forced film formation. Among them, the liquid inlet of the heating tube 30 extends more than 10 mm on the upper tube sheet.

[0045] Combined with Figure 1 , in some embodiments, to prevent the material forced distributor 60 from blocking the heating tube 30, along the axial direction of the main body 10, the material forced distributor 60 is spaced from the corresponding heating tube 30. When the liquid level of the liquid material on the upper tube sheet 20 exceeds the liquid inlet of the heating tube 30, the liquid material enters the heating tube 30 through overflow normally. Among them, the distance between the material forced distributor 60 and the corresponding heating tube 30 is more than 10 mm.

[0046] Figure 4 For Figure 1 the structural schematic diagram of the material forced distributor 60 of the middle-tube falling film evaporator. Combined with Figure 4, in some embodiments, the material forced distributor 60 includes: a cylinder body 61 and an adjusting member 62. The cylinder body 61 corresponds to the plurality of heating tubes 30 one by one and is located above the corresponding heating tube 30. Along the axial direction of the main body 10, the projection of the cylinder body 61 on the main body 10 overlaps with the projection of the corresponding heating tube 30 on the main body 10. The cylinder body 61 is located between the upper tube sheet 20 and the film distributor 50. The adjusting member 62 is connected to the end of the cylinder body 61 facing away from the heating tube 30. Among them, the adjusting member 62 can be threadedly connected to the cylinder body 61, and the adjusting member 62 can be a bolt or a screw.

[0047] When it is necessary to make the cylinder body 61 located above the corresponding heating tube 30, the adjusting member 62 can be operated to drive the cylinder body 61 to move through the adjusting member 62 so that the cylinder body 61 is located above the corresponding heating tube 30.

[0048] After the liquid material passes through the film distributor 50, it will fall onto the cylinder body 61. By the cylinder body 61 blocking the corresponding heating tube 30, it is possible to prevent the liquid material from directly entering the heating tube 30 and force the liquid material to change its running path. The liquid material will accumulate on the upper tube sheet 20. At the same time, when the liquid material falls onto the cylinder body 61, it will smoothly flow along the outer wall of the cylinder body 61 to the upper tube sheet 20 until the liquid level of the liquid material on the upper tube sheet 20 exceeds the liquid inlet of the heating tube 30. The liquid material enters the heating tube 30 through overflow. The liquid material is forced to flow uniformly downward along the inner wall of the heating tube 30 and will not enter the center of the heating tube 30, achieving the effect of forced film formation, forcing the material to change its running path, so that there is a liquid film in each heating tube 30, approaching the ideal liquid film flow state, improving the heat exchange efficiency of the heating tube 30, and enabling the scale to adhere more evenly to the inner surface of the heating tube 30. The liquid film can add a protective layer to the iron of the heating tube 30 during pickling, extend the service life of the heating tube 30, can increase the evaporation amount of the evaporator and reduce the steam consumption, and reduce the cost.

[0049] In some embodiments, in order to enable the cylinder body 61 to completely block the heating tube 30, the outer diameter of the cylinder body 61 is greater than or equal to the outer diameter of the heating tube 30 to prevent the liquid material from directly entering the heating tube 30.

[0050] Combined with Figure 1 , in some embodiments, in order to realize the installation of the cylinder body 61, the tubular falling film evaporator further includes a plurality of first support members 70. One end of each first support member 70 is connected to the main body 10, and the other end passes through the cylinder body 61 of the plurality of material forced distributors 60 and is connected to the main body 10 to support the cylinder body 61 and ensure the stability of the installation of the cylinder body 61.

[0051] In some embodiments, to ensure the stability of the installation of the cylinder body 61, the adjusting member 62 is passed through the cylinder body 61 and abuts against the first support member 70. The cylinder body 61 slides on the first support member 70 until the cylinder body 61 reaches above the corresponding heating pipe 30. At this time, the adjusting member 62 is operated, and the adjusting member 62 moves towards the first support member 70 so that the adjusting member 70 abuts against the first support member 70, realizing the limit of the cylinder body 61, avoiding the displacement of the position of the cylinder body 61, and ensuring that the liquid material does not flow into the heating pipe 30.

[0052] In some embodiments, along the radial direction of the cylinder body 61, a through hole 63 is formed in the cylinder body 61, and the first support member 70 is passed through the through hole 63.

[0053] Figure 3 For Figure 1 Schematic diagram of the structure of the material buffer 40 of the middle-tube falling film evaporator. Combining Figure 3 In some embodiments, to achieve the buffering of the liquid material, the material buffer 40 includes: a communication pipe 41 and a guiding vane 42. The communication pipe 41 is communicated with the liquid inlet of the main body 10. The guiding vane 42 is arranged in the communication pipe 41 and is arranged in a spiral shape.

[0054] After the liquid material enters the communication pipe 41, the guiding vane 42 guides the liquid material to perform buffering, reducing the impact force of the liquid material, ensuring the safety of the film distributor 50. At the same time, since the guiding vane 42 is arranged in a spiral shape, the guiding vane 42 can make the liquid material swirl along the radial direction of the communication pipe 41, expanding the scattering area of the liquid material entering the main body 10, so that the liquid material can be evenly distributed on the film distributor 50, and the liquid material can be fully distributed on the film distributor 50, expanding the coverage area of the liquid material.

[0055] Combining Figure 1 In some embodiments, to realize the recycling of the liquid material, the tubular falling film evaporator further includes: a liquid delivery pipe 80 and a material circulation pump 90. The liquid delivery pipe 80 is communicated with the communication pipe 41 and the liquid outlet of the main body 10. The material circulation pump 90 is arranged on the liquid delivery pipe 80.

[0056] Starting the material circulation pump 90 can make the liquid material in the main body 10 enter the liquid delivery pipe 80 through the liquid outlet of the main body 10, and then enter the main body 10 through the communication pipe 41 to realize the circulation of the liquid material.

[0057] In some embodiments, to achieve the buffering of the liquid material, the diameter of the communication pipe 41 is larger than the diameter of the liquid delivery pipe 80, so that when the liquid material enters the communication pipe 41 from the delivery pipe 80, the flow rate of the liquid material can be reduced to reduce the impact force of the liquid material. Among them, the diameter of the communication pipe 41 can be more than one time the diameter of the liquid delivery pipe 80.

[0058] Combined with Figure 1 , in some embodiments, in order to evenly distribute the liquid material onto the upper tube sheet 20, the film distributor 50 includes: an orifice plate 51, a second support member 52, and a third support member 53. A plurality of orifice plates 51 are provided in the main body 10 and are located between the upper tube sheet 20 and the material buffer 40. Along the axial direction of the main body 10, the plurality of orifice plates 51 are arranged at intervals. The second support member 52 is connected to two adjacent orifice plates 51 to realize the connection between the two adjacent orifice plates 51, so that the lower orifice plate 51 can support the upper orifice plate 51. One end of the third support member 53 is connected to the upper tube sheet 20, and the other end is connected to the orifice plate closest to the upper tube sheet 20 among the plurality of orifice plates 51. The upper tube sheet 20 supports the orifice plate closest to the upper tube sheet 20 among the plurality of orifice plates 51 through the third support member 53 to realize the overall support of the film distributor 50 and ensure the stability of the installation of the film distributor 50.

[0059] When the liquid material enters the main body 10 through the material buffer 40, it will fall onto the plurality of orifice plates 51. The liquid material is distributed through the plurality of orifice plates 51, which can buffer the liquid material and reduce the impact force of the liquid material on the upper tube sheet 20 and the plurality of material forced distributors 60. At the same time, the liquid material can be evenly distributed onto the upper tube sheet 20, that is to say, every part of the upper tube sheet 20 can have liquid material. When the liquid level of the liquid material on the upper tube sheet 20 exceeds the liquid inlet of the heating tube 30, the liquid material enters each heating tube 30 through overflow.

[0060] In some embodiments, the number of layers of the orifice plate can be two or three.

[0061] In some embodiments, along the direction from the material buffer 40 to the upper tube sheet 20, the areas of the plurality of orifice plates 51 increase in diameter from top to bottom, which can fully buffer the liquid material, buffer the liquid material, reduce the impact force of the liquid material on the upper tube sheet 20 and the plurality of material forced distributors 60. At the same time, the liquid material can be evenly distributed onto the upper tube sheet 20, that is to say, every part of the upper tube sheet 20 can have liquid material. When the liquid level of the liquid material on the upper tube sheet 20 exceeds the liquid inlet of the heating tube 30, the liquid material enters each heating tube 30 through overflow.

[0062] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0063] In the description of the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0064] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean 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 this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0065] Although the preferred embodiments of the present application have been described, those of ordinary skill in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A tubular falling film evaporator, characterized in that, Comprising: A body; An upper tube sheet, disposed within the body; A plurality of heating tubes, disposed within the body and passing through the upper tube sheet; A material buffer, communicating with the liquid inlet of the body; A film distributor, disposed within the body and connected to the upper tube sheet, the film distributor being located between the upper tube sheet and the material buffer; A plurality of material forced distributors, disposed within the body and corresponding to the plurality of heating tubes one by one, the material forced distributor being located above the corresponding heating tube, along the axial direction of the body, the projection of the material forced distributor on the body overlaps with the projection of the corresponding heating tube on the body, and the material forced distributor is located between the upper tube sheet and the film distributor.

2. The tubular falling film evaporator according to claim 1, wherein Along the axial direction of the body, the liquid inlet of the heating tube is spaced from the upper tube sheet.

3. The tubular falling film evaporator according to claim 1, wherein Along the axial direction of the body, the material forced distributor is spaced from the corresponding heating tube.

4. The tubular falling film evaporator according to any one of claims 1-3, characterized in that, The material forced distributor includes: A cylinder, corresponding to the plurality of heating tubes one by one and located above the corresponding heating tube, along the axial direction of the body, the projection of the cylinder on the body overlaps with the projection of the corresponding heating tube on the body, and the cylinder is located between the upper tube sheet and the film distributor; An adjusting member, connected to the end of the cylinder facing away from the heating tube.

5. The tubular falling film evaporator according to claim 4, characterized in that, The tubular falling film evaporator further includes a plurality of first support members; One end of each first support member is connected to the body, and the other end passes through the cylinders of the plurality of material forced distributors and is connected to the body; Wherein, the adjusting member passes through the cylinder and abuts against the first support member.

6. The tubular falling film evaporator according to any one of claims 1-3, characterized in that The material buffer includes: A connecting pipe, communicating with the liquid inlet of the body; Guide vanes, disposed within the connecting pipe and arranged in a spiral shape.

7. The tubular falling film evaporator according to claim 6, characterized in that, The tubular falling film evaporator further includes: An infusion pipe, communicating with the connecting pipe and the liquid outlet of the body; A material circulation pump, disposed on the infusion pipe.

8. The tube type falling film evaporator according to claim 7, characterized in that, The diameter of the connecting pipe is larger than the diameter of the infusion pipe.

9. The tubular falling film evaporator according to any one of claims 1-3, characterized in that, The film distributor includes: A plurality of orifice plates, disposed within the body and located between the upper tube sheet and the material buffer, along the axial direction of the body, the plurality of orifice plates are spaced apart; A second support member, connecting two adjacent orifice plates; A third support member, one end of which is connected to the upper tube sheet and the other end of which is connected to the orifice plate closest to the upper tube sheet among the plurality of orifice plates.

10. The tubular falling film evaporator according to any one of claims 1-3, characterized in that, Along the direction from the material buffer to the upper tube sheet, the areas of the plurality of orifice plates decrease.

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