Vertical double-layered scraped thin-film evaporator

Abstract

The utility model discloses a vertical double -deck scraper film evaporator relates to evaporative equipment technical field, include: evaporator subassembly, the evaporator subassembly is used for providing installation base for double -deck scraper inner heat exchange component, double -deck scraper inner heat exchange component, double -deck scraper inner heat exchange component includes the hollow rotating shaft that sets up in the evaporation cylinder inside center position along the vertical direction and is connected with evaporation cylinder rotation through two gear B, the hollow rotating shaft inner chamber coaxially nested and is provided with inner heating cylinder, the utility model discloses through to the hollow rotating shaft and inner heating cylinder are integrated, can avoid the problem that the evaporation area is small that the rotating shaft occupies center space in traditional scheme, has greater heat exchange area, and the evaporation efficiency is further improved, is applicable to high viscosity, easy scale and contains a large amount of solid or need high concentration ratio material.

Description

Technical Field

[0001] This utility model relates to the field of evaporation equipment technology, and in particular to a vertical double-layer scraped thin film evaporator. Background Technology

[0002] The shell of the plate thin film evaporator is equipped with a heating steam jacket, and the inside is equipped with a rotatable scraper. The scraper is driven by a rotating shaft in the center of the cylinder. After the raw material liquid is added tangentially from the top of the evaporator, it forms a downward spiral film along the inner wall of the shell under the action of gravity and the rotating scraper. The finished liquid is discharged from the bottom of the evaporator, and the secondary steam is discharged from the top after passing through a demister.

[0003] Currently, traditional single-layer scraped film evaporators mainly use a scraper system to form a film on the inner wall of the heating cylinder to complete the evaporation process. However, this type of single-layer scraped film evaporator still has some limitations, such as heat exchange only through the inner wall of the evaporation cylinder, resulting in a limited heat exchange area. This leads to low evaporation efficiency when processing high-concentration or high-viscosity materials. In addition, the rotating shaft of traditional single-layer scraped film evaporators is mostly a solid shaft, which occupies the central space of the evaporation cylinder and further compresses the effective evaporation area.

[0004] Therefore, it is necessary to invent a vertical double-layer scraped thin film evaporator to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a vertical double-layer scraped film evaporator. By integrating the hollow rotating shaft with the inner heating cylinder, it avoids the problem of small evaporation area caused by the rotating shaft occupying the central space in traditional solutions. It has a larger heat exchange area and further improves evaporation efficiency. It is suitable for materials with high viscosity, easy scaling, and containing a large amount of solids or requiring a high concentration ratio. This solves the problem mentioned in the background technology that heat exchange can only be carried out through the inner wall of the evaporation cylinder, resulting in a limited heat exchange area. This leads to low evaporation efficiency when processing high-concentration or high-viscosity materials. At the same time, the rotating shaft of traditional single-layer scraped film evaporators is mostly a solid shaft, which occupies the central space of the evaporation cylinder and further compresses the effective evaporation area.

[0006] According to one aspect of this disclosure, the following technical solution is provided: a vertical double-layer scraped thin-film evaporator, comprising:

[0007] An evaporator assembly that provides a mounting base for a double-scraped internal heat exchange assembly;

[0008] A double-layer scraper internal heat exchange assembly includes a hollow rotating shaft rotatably disposed vertically at the center of an evaporator and rotatably connected to the evaporator via two gears B. An inner heating cylinder is coaxially nested within the hollow rotating shaft. Bearings a, fixedly connected to the inner wall of the hollow rotating shaft, are fixedly sleeved at the top and bottom of the outer side of the inner heating cylinder. A high-temperature steam inlet a is opened at the top of the inner heating cylinder, and a condensate outlet a is opened at the bottom. A scraper frame is fixedly sleeved on the outer side of the hollow rotating shaft. Inner scrapers for scraping the outer wall of the inner heating cylinder are fixedly arranged radially on the inner side of the scraper frame, and outer scrapers for scraping the inner wall of the evaporator are fixedly arranged axially on the outer side of the scraper frame.

[0009] A drive assembly for driving the heat exchange assembly inside the double-layer scraper.

[0010] According to at least one embodiment of the present disclosure, a vertical double-layer scraped thin-film evaporator is provided, wherein the evaporator assembly includes an evaporation cylinder, wherein a liquid inlet is provided at the top left side and a secondary steam outlet is provided at the top right side, and concentrated liquid outlets are provided on both sides of the bottom of the evaporation cylinder.

[0011] According to at least one embodiment of the present disclosure, a vertical double-layer scraped thin-film evaporator is provided with a heating jacket fixedly sleeved on the outside of the evaporation cylinder, and a spiral-shaped guide plate that fits against the outer wall of the evaporation cylinder is fixedly provided inside the heating jacket.

[0012] According to at least one embodiment of the vertical double-layer scraped film evaporator of the present disclosure, a high-temperature steam inlet b is provided at the top right side of the heating jacket, and a condensate outlet b is provided at the bottom left side of the heating jacket.

[0013] According to at least one embodiment of the present disclosure, a vertical double-layer scraped thin film evaporator is provided with a feeder fixedly installed at the top of the inner cavity of the evaporator cylinder and sleeved on the outside of the hollow rotating shaft. The top of the feeder is provided with a plurality of guide holes evenly distributed in an annular pattern.

[0014] According to at least one embodiment of the present disclosure, a vertical double-layer scraped thin-film evaporator is provided, wherein the drive assembly includes a motor and two meshing transmission gears, one of which is tractively connected to the bottom of the motor, and the other is fixedly sleeved on the outside of a hollow rotating shaft.

[0015] According to at least one embodiment of the vertical double-layer scraped thin-film evaporator of the present disclosure, a mounting bracket is fixedly provided on the side of the motor, and the mounting bracket is fixedly connected to the outer wall of the evaporation cylinder.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] This invention integrates a hollow rotating shaft with an inner heating cylinder, which avoids the problem of a small evaporation area caused by the rotating shaft occupying the central space in traditional solutions. It has a larger heat exchange area and further improves evaporation efficiency, making it suitable for materials with high viscosity, easy scaling, or containing a large amount of solids or requiring a high concentration ratio.

[0018] This invention incorporates a guide plate to guide the high-temperature steam entering the heating jacket, thereby ensuring uniform steam flow inside the heating jacket and eliminating material coking caused by localized overheating of the inner wall of the evaporator. Attached Figure Description

[0019] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0020] Figure 1 This is a schematic diagram of the overall front cross-sectional structure of a vertical double-layer scraped thin film evaporator according to one embodiment of the present disclosure.

[0021] Figure 2 This is a schematic diagram of the scraper frame structure of a vertical double-layer scraped thin-film evaporator according to one embodiment of the present disclosure.

[0022] Figure 3 This is a top view of the feeder structure of a vertical double-layer scraped thin-film evaporator according to one embodiment of the present disclosure.

[0023] The specific labels in the attached figures are as follows:

[0024] 1. Motor; 2. High-temperature steam inlet a; 3. Bearing a; 4. Transmission gear; 5. Hollow shaft; 6. Gear B; 7. Liquid inlet; 8. Secondary steam outlet; 9. High-temperature steam inlet b; 10. Heating jacket; 11. Distributor; 12. Scraper frame; 13. Inner heating cylinder; 14. Guide plate; 15. Inner scraper; 16. Outer scraper; 17. Condensate outlet b; 18. Concentrate outlet; 19. Condensate outlet a; 20. Vapor-liquid separation chamber; 21. Evaporation cylinder; 22. Guide hole. Detailed Implementation

[0025] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” other components or features would subsequently be positioned “above” said other components or features. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0026] Figure 1 This is a schematic diagram of the overall front cross-sectional structure of a vertical double-layer scraped thin film evaporator according to one embodiment of the present disclosure.

[0027] Figure 2 This is a schematic diagram of the scraper frame 12 structure of a vertical double-layer scraped thin film evaporator according to one embodiment of the present disclosure.

[0028] Figure 3 This is a top view of the fabricator 11 of a vertical double-layer scraped thin-film evaporator according to one embodiment of the present disclosure.

[0029] like Figures 1-3 As shown, the vertical double-layer scraped thin-film evaporator disclosed herein includes components such as an evaporator assembly, a double-layer scraped internal heat exchange assembly, and a drive assembly.

[0030] like Figure 2As shown in this disclosure, the evaporator assembly includes an evaporator cylinder 21. A liquid inlet 7 is located at the top left side of the evaporator cylinder 21, and a secondary steam outlet 8 is located at the top right side. Concentrate outlets 18 are located on both sides of the bottom of the evaporator cylinder 21. A heating jacket 10 is fixedly fitted onto the outside of the evaporator cylinder 21. A spiral-shaped guide plate 14, fitted to the outer wall of the evaporator cylinder 21, is fixedly installed inside the heating jacket 10. The guide plate 14 guides the high-temperature steam entering the heating jacket 10, thereby ensuring uniform steam flow inside the heating jacket 10 and eliminating localized overheating of the inner wall of the evaporator cylinder 21. To address the coking of materials, a high-temperature steam inlet b9 is provided on the top right side of the heating jacket 10, and a condensate outlet b17 is provided on the bottom left side of the heating jacket 10. A distributor 11, which is sleeved on the outside of the hollow rotating shaft 5, is fixedly installed on the top of the inner cavity of the evaporator 21. The distributor 11 has multiple annularly distributed guide holes 22 evenly distributed on its top. The distributor 11 divides the inner cavity of the evaporator 21 into an upper and lower distributed vapor-liquid separation chamber 20 and an evaporation chamber. The liquid inlet 7 and the secondary steam outlet 8 are both connected to the vapor-liquid separation chamber 20. The vapor-liquid separation chamber 20 and the evaporation chamber are connected through multiple annularly distributed guide holes 22.

[0031] This allows high-temperature steam to be input into the heating jacket 10 through the high-temperature steam inlet b9. Under the guidance of the guide plate 14, the high-temperature steam moves downward in a spiral shape and uniformly heats the evaporation cylinder 21 during this process. This allows the inner wall of the evaporation cylinder 21 to heat the material. Subsequently, the material is added into the vapor-liquid separation chamber 20 through the liquid inlet 7. The material passes through multiple guide holes 22 at the top of the distributor 11 and enters the evaporation chamber. After heat exchange and evaporation with the inside of the evaporation cylinder 21 and the outside of the inner heating cylinder 13, the steam returns to the inside of the vapor-liquid separation chamber 20 through the guide holes 22 and is output through the secondary steam outlet 8. The concentrated liquid produced after evaporation is output through the concentrated liquid outlet 18.

[0032] like Figure 2 As shown, in a preferred embodiment, the double-layer scraper internal heat exchange assembly includes a hollow rotating shaft 5 rotatably disposed at the center of the evaporator cylinder 21 in a vertical direction and rotatably connected to the evaporator cylinder 21 via two gears B6. An inner heating cylinder 13 is coaxially nested in the inner cavity of the hollow rotating shaft 5. Bearings a3, which are fixedly connected to the inner wall of the hollow rotating shaft 5, are fixedly sleeved on the top and bottom of the outer side of the inner heating cylinder 13. A high-temperature steam inlet a2 is opened at the top of the inner heating cylinder 13 and a condensate outlet a19 is opened at the bottom. A scraper frame 12 is fixedly sleeved on the outer side of the hollow rotating shaft 5. An inner scraper 15 for scraping the outer wall of the inner heating cylinder 13 is fixedly arranged radially on the inner side of the scraper frame 12, and an outer scraper 16 for scraping the inner wall of the evaporator cylinder 21 is fixedly arranged axially on the outer side of the scraper frame 12.

[0033] Therefore, the high-temperature steam input pipe and the condensate output pipe are fixedly connected to the top and bottom of the high-temperature steam inlet a2, respectively. During the process of heating the evaporation cylinder 21 by the high-temperature steam inside the heating jacket 10, the high-temperature steam input pipe simultaneously inputs high-temperature steam into the hollow rotating shaft 5 through the high-temperature steam inlet a2. The high-temperature steam enters the inner wall of the inner heating cylinder 13 and heats the inner heating cylinder 13. The condensate generated after heat exchange is output to the condensate output pipe through the condensate outlet a19. At this time, both the inner wall of the evaporation cylinder 21 and the outer wall of the inner heating cylinder 13 can heat the material. Compared with the prior art, by integrating the hollow rotating shaft 5 and the inner heating cylinder 13, the problem of small evaporation area caused by the rotating shaft occupying the central space in the traditional solution can be avoided. It has a larger heat exchange area and the evaporation efficiency is further improved. It is suitable for materials with high viscosity, easy scaling, and containing a large amount of solids or requiring a high concentration ratio.

[0034] like Figure 3 As shown in this disclosure, the drive assembly includes a motor 1 and two meshing transmission gears 4. One transmission gear 4 is connected to the bottom of the motor 1, and the other transmission gear 4 is fixedly sleeved on the outside of the hollow rotating shaft 5. A mounting bracket (not shown) is fixedly installed on the side of the motor 1, and the mounting bracket is fixedly connected to the outer wall of the evaporator 21.

[0035] Therefore, when the motor 1 is powered on, it drives the hollow shaft 5 to rotate through the two transmission gears 4. When the hollow shaft 5 rotates, it drives multiple inner scrapers 15 and outer scrapers 16 to rotate through the scraper frame 12. This causes the inner scrapers 15 and outer scrapers 16 to scrape the outer wall of the inner heating cylinder 13 and the inner wall of the evaporation cylinder 21, respectively, thereby forming a material film on both the outer wall of the inner heating cylinder 13 and the inner wall of the evaporation cylinder 21, further improving the material evaporation efficiency.

[0036] It should also be noted that any content not described in detail in this specification is prior art known to those skilled in the art.

[0037] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.

Claims

1. A vertical double-layer scraped thin-film evaporator, characterized in that, include: An evaporator assembly that provides a mounting base for a double-scraped internal heat exchange assembly; A double-layer scraper internal heat exchange assembly includes a hollow rotating shaft rotatably disposed vertically at the center of an evaporator and rotatably connected to the evaporator via two gears B. An inner heating cylinder is coaxially nested within the hollow rotating shaft. Bearings a, fixedly connected to the inner wall of the hollow rotating shaft, are fixedly sleeved at the top and bottom of the outer side of the inner heating cylinder. A high-temperature steam inlet a is opened at the top of the inner heating cylinder, and a condensate outlet a is opened at the bottom. A scraper frame is fixedly sleeved on the outer side of the hollow rotating shaft. Inner scrapers for scraping the outer wall of the inner heating cylinder are fixedly arranged radially on the inner side of the scraper frame, and outer scrapers for scraping the inner wall of the evaporator are fixedly arranged axially on the outer side of the scraper frame. A drive assembly for driving the heat exchange assembly inside the double-layer scraper.

2. The vertical double-layer scraped thin-film evaporator according to claim 1, characterized in that: The evaporator assembly includes an evaporator cylinder, with a liquid inlet on the top left side and a secondary steam outlet on the top right side, and concentrated liquid outlets on both sides of the bottom of the evaporator cylinder.

3. The vertical double-layer scraped thin-film evaporator according to claim 2, characterized in that: A heating jacket is fixedly sleeved on the outside of the evaporator cylinder, and a spiral guide plate that fits against the outer wall of the evaporator cylinder is fixedly installed inside the heating jacket.

4. The vertical double-layer scraped thin-film evaporator according to claim 3, characterized in that: A high-temperature steam inlet b is provided on the top right side of the heating jacket, and a condensate outlet b is provided on the bottom left side of the heating jacket.

5. The vertical double-layer scraped thin-film evaporator according to claim 4, characterized in that: A feeder is fixedly installed at the top of the inner cavity of the evaporator cylinder and sleeved on the outside of the hollow rotating shaft. The top of the feeder has a plurality of guide holes evenly distributed in a ring.

6. The vertical double-layer scraped thin-film evaporator according to claim 5, characterized in that: The distributor divides the inner cavity of the evaporator into a vapor-liquid separation chamber and an evaporation chamber distributed vertically. The liquid inlet and the secondary steam outlet are both connected to the vapor-liquid separation chamber. The vapor-liquid separation chamber and the evaporation chamber are connected through a plurality of annularly distributed guide holes.

7. The vertical double-layer scraped thin-film evaporator according to claim 6, characterized in that: The drive assembly includes a motor and two meshing transmission gears. One transmission gear is connected to the bottom of the motor, and the other transmission gear is fixedly sleeved on the outside of the hollow shaft.

8. The vertical double-layer scraped thin-film evaporator according to claim 7, characterized in that: A mounting bracket is fixedly installed on the side of the motor, and the mounting bracket is fixedly connected to the outer wall of the evaporator.

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