Short path evaporator with built-in condenser

Abstract

The utility model provides a kind of short-range evaporator built-in condenser, belong to chemical equipment technical field, comprising: pipe box, floating head, heat exchange tube group and exhaust component. Pipe box is equipped with tube sheet and head plate, cold medium cavity is formed between tube sheet and head plate, and floating head cavity is equipped in floating head inside. Heat exchange tube group includes multiple heat exchange tubes, one end of heat exchange tube is connected with cold medium cavity, and the other end is connected with floating head cavity. Connection hole is equipped on tube sheet, and reinforcing sleeve is fixedly connected on connection hole. Exhaust component includes assembly pipe and exhaust pipe, one end of assembly pipe is connected with cold medium cavity, and the other end is connected with floating head cavity. Exhaust pipe is placed in assembly pipe inside, and the air inlet end of exhaust pipe is inserted into floating head cavity inside, and the air outlet end of exhaust pipe is stretched to the outside of pipe box along assembly hole on head plate. The short-range evaporator built-in condenser of the utility model can avoid the fracture of heat exchange tube, and discharge the gasified cold medium in time.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, and in particular relates to a built-in condenser for a short-range evaporator. Background Technology

[0002] A short-path evaporator is a common chemical processing device that separates different components from materials under low-pressure conditions based on the differences in molecular motion rates and boiling points. Existing short-path evaporators generally use a liquid heat transfer medium (such as heat transfer oil) for heating. A rotating scraping film system is installed on the cylindrical inner surface of the heated evaporator. During operation, this system scrapes the material into a uniform thin film, optimizing heat and mass transfer processes and significantly improving evaporation efficiency. Correspondingly, a condenser is also installed inside the short-path evaporator to facilitate the condensation of the evaporated components.

[0003] Because the material heated to the gaseous phase in the short-path evaporator travels a very short distance to reach the condenser, and the temperature difference between the inside and outside of the heat exchange tubes in the condenser is relatively high, the heat exchange tubes are prone to thermal fatigue in practical applications. Furthermore, the movement of the scraper system causes vibration loads on the heat exchange tubes, making them susceptible to breakage. Additionally, once the condenser begins heat exchange with the material inside the short-path evaporator, the cold medium inside the condenser (usually chilled brine) inevitably undergoes partial vaporization. During prolonged operation, the repeated vaporization and condensation of the cold medium can lead to excessive thermal fatigue inside the condenser, negatively impacting its service life. Utility Model Content

[0004] In view of this, the present invention aims to propose a short-range evaporator with a built-in condenser to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A short-range evaporator with an integrated condenser includes: a tube box, a floating head, a heat exchange tube assembly, and an exhaust assembly. The tube box contains a tube sheet and a head plate, forming a cold medium cavity between the tube sheet and the head plate. A floating head cavity is also provided inside the floating head. The heat exchange tube assembly includes multiple heat exchange tubes, with one end of each tube connected to the cold medium cavity and the other end connected to the floating head cavity. The tube sheet has connection holes for accommodating the heat exchange tubes, and a reinforcing sleeve for improving the stability of the heat exchange tubes is fixed to the end of the connection hole near the floating head. The exhaust assembly includes an assembly pipe and an exhaust pipe. One end of the pipe is connected to the cold medium cavity, and the other end is connected to the floating head cavity. The exhaust pipe is placed inside the assembly pipe, and an expansion gap is formed between the outer wall of the exhaust pipe and the inner wall of the assembly pipe. The air inlet end of the exhaust pipe is inserted into the floating head cavity, and the air inlet end of the exhaust pipe is higher than the inner wall of the floating head cavity near the cold medium cavity. A flow guiding gap is formed between the air inlet end of the exhaust pipe and the inner wall of the floating head cavity away from the cold medium cavity. The air outlet end of the exhaust pipe extends to the outside of the pipe box along the assembly hole on the end cap plate, and the outer wall of the exhaust pipe is fixedly connected to the inner wall of the assembly hole.

[0007] Furthermore, the heat exchange tube end is provided with an expansion reinforcement section and a connecting section, and the connecting section is connected to the heat exchange tube through the expansion reinforcement section; the expansion reinforcement section is located at the junction of the reinforcing sleeve and the connecting hole, the end of the connecting section is inserted into the cold medium cavity, and the outer wall of the connecting section is fixedly connected to the tube sheet.

[0008] Furthermore, multiple positioning plates are provided between the tube box and the floating head, and the positioning plates are provided with a first receiving hole for accommodating the heat exchange tube and a second receiving hole for accommodating the assembly tube.

[0009] Furthermore, the positioning plate is connected to the tube sheet via a tie rod.

[0010] Furthermore, the side wall of the pipe box is provided with a cold medium inlet pipe and a cold medium outlet pipe, and both the cold medium inlet pipe and the cold medium outlet pipe are connected to the cold medium cavity.

[0011] Furthermore, the outside of the pipe box is provided with a heat medium jacket, and the heat medium jacket is provided with a heat medium inlet pipe and a heat medium outlet pipe.

[0012] Furthermore, the tubing box is also equipped with a light fraction discharge pipe, a heavy fraction discharge pipe, and a vacuum pipe.

[0013] Compared with existing technologies, the short-range evaporator with built-in condenser described in this utility model has the following advantages:

[0014] This invention discloses a short-range evaporator with an integrated condenser. A reinforcing sleeve is provided at the connection between the tube sheet and the heat exchange tubes. This sleeve improves the connection stability between the heat exchange tubes and the tube sheet, preventing excessive vibration loads on the heat exchange tubes during operation. Secondly, this condenser can guide the vaporized cold medium inside the floating head cavity to the outside through the exhaust pipe, preventing repeated condensation and vaporization of the cold medium during operation, thereby reducing thermal fatigue inside the condenser. Furthermore, an expansion gap exists between the assembly pipe and the exhaust pipe, forming a flow guiding gap between the inlet end of the exhaust pipe and the inner wall of the floating head cavity away from the cold medium cavity. The inlet end of the exhaust pipe is higher than the inner wall of the floating head cavity near the cold medium cavity. Therefore, when the floating head floats due to thermal deformation, the exhaust pipe ensures that the gas inside the floating head cavity is discharged, guaranteeing the normal operation of the device. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of the short-range evaporator with built-in condenser described in an embodiment of the present invention;

[0017] Figure 2 This is a partial structural diagram of the tube box, heat exchange tube, exhaust assembly, and floating head described in an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the connection position between the heat exchange tube and the tube sheet according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the pipe arrangement of the built-in condenser in the short-range evaporator according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Short-path evaporator; 2-Tube box; 21-Tube sheet; 22-End plate; 23-Cold medium cavity; 24-Reinforcing sleeve; 3-Floating head; 31-Floating head cavity; 4-Heat exchange tube; 41-Expansion reinforcement section; 42-Connecting section; 51-Assembly pipe; 52-Exhaust pipe; 6-Positioning plate; 61-Tie rod; 71-Cold medium inlet pipe; 72-Cold medium outlet pipe; 73-Hot medium inlet pipe; 74-Hot medium outlet pipe; 75-Light distillate discharge pipe; 76-Heavy distillate discharge pipe; 77-Vacuum pipe; 8-Hot medium jacket. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] A short-path evaporator with a built-in condenser is used to condense the material inside the evaporator, thereby facilitating the separation of different components within the material. For example... Figures 1-4 As shown, in this embodiment, the short-range evaporator with built-in condenser includes: a tube box 2, a floating head 3, a heat exchange tube assembly, and an exhaust assembly. The tube box 2 is connected to the floating head 3 via the heat exchange tube assembly, and the exhaust assembly is mounted on the floating head 3. Figure 1 As shown, before use, the operator can insert the end of the device with the float 3 into the short-path evaporator 1 and connect the device to the short-path evaporator 1 through the flange on the tube box 2. During use, the device will condense the material inside the short-path evaporator 1 to separate the different components in the material.

[0027] Specifically, the tube box 2 is equipped with a tube sheet 21 and a head plate 22, forming a cold medium cavity 23 between the tube sheet 21 and the head plate 22, and a floating head cavity 31 is provided inside the floating head 3. The heat exchange tube assembly includes multiple heat exchange tubes 4, with one end of each heat exchange tube 4 connected to the cold medium cavity 23 and the other end connected to the floating head cavity 31. During operation, the cold medium (e.g., chilled brine) flows within the cold medium cavity 23, the heat exchange tubes 4, and the floating head cavity 31. When the heated and vaporized material inside the short-path evaporator 1 comes into contact with this condenser, the cold energy carried by the cold medium causes the vaporized material to condense. Since different components in the material have different vaporization and condensation temperatures, the purpose of separating different components in the material can be achieved.

[0028] As an optional implementation of this embodiment, to facilitate the circulation of the cold medium and to facilitate its replenishment and replacement, a cold medium inflow pipe 71 and a cold medium outflow pipe 72 may be provided on the side wall of the pipe box 2, and both the cold medium inflow pipe 71 and the cold medium outflow pipe 72 should be connected to the cold medium cavity 23. In use, the cold medium will enter the cold medium cavity 23 through the cold medium inflow pipe 71, then flow into the floating head cavity 31 through the heat exchange pipe 4, and then flow back into the cold medium cavity 23 through the heat exchange pipe 4, and leave the device through the cold medium outflow pipe 72.

[0029] When the scraping film system inside the short-path evaporator 1 is activated, the condenser inside the short-path evaporator 1 will inevitably be subjected to vibration loads due to the movement of the scraping film system. In addition, the temperature difference between the inner and outer sides of the heat exchange tube 4 will cause the heat exchange tube 4 to experience thermal fatigue, thus making it prone to breakage during practical applications. To solve this problem, this embodiment provides a connection hole on the tube sheet 21 for accommodating the heat exchange tube 4, and a reinforcing sleeve 24 is fixed (e.g., welded) to the end of the connection hole near the floating head 3 to improve the stability of the heat exchange tube 4. By providing the reinforcing sleeve 24, the contact area between the heat exchange tube 4 and the tube sheet 2 can be increased. When the scraping film system inside the short-path evaporator 1 is activated, the larger contact area between the heat exchange tube 4 and the tube sheet 2 in this device reduces the vibration load on the heat exchange tube 4, thereby preventing breakage.

[0030] It should be noted that, in order to enhance the structural strength of the heat exchange tube 4 and the tube sheet 2, the wall thickness of the heat exchange tube 4 and the thickness of the tube sheet 2 can be appropriately increased during the fabrication of this device without affecting the heat exchange effect, thereby enabling the heat exchange tube 4 and the tube sheet 2 to obtain a higher thermal fatigue threshold.

[0031] Optional, such as Figure 3As shown, the heat exchange tube 4 has an expansion-strengthened section 41 and a connecting section 42 at its end, and the connecting section 42 is connected to the heat exchange tube 4 through the expansion-strengthened section 41. During the assembly of the heat exchange tube 4 and the tube sheet 2, the expansion-strengthened section 41 should be located at the junction of the reinforcing sleeve 4 and the connecting hole, and the expansion-strengthened section 41 should be expanded so that its outer wall is tightly fitted to the inner wall at the junction of the reinforcing sleeve 4 and the connecting hole. The end of the connecting section 42 should be inserted into the cold medium cavity 23, and the outer wall of the connecting section 42 should be fixedly connected to the tube sheet 21 (e.g., by welding) to facilitate the flow of cold medium into or out of the heat exchange tube 4.

[0032] In actual operation, the cold medium undergoes repeated vaporization and condensation during heat exchange with the heated material. This leads to significant thermal fatigue damage to the heat exchange tube 4 and the floating head 3. To address this issue, the exhaust assembly in this embodiment includes an assembly pipe 51 and an exhaust pipe 52, as shown below. Figure 2 As shown, one end of the assembly pipe 51 is connected to the cold medium cavity 23, and the other end is connected to the float head cavity 31. The exhaust pipe 52 is placed inside the assembly pipe 51, and an expansion gap is formed between the outer wall of the exhaust pipe 52 and the inner wall of the assembly pipe 51. During assembly, the air inlet end of the exhaust pipe 52 should be inserted into the float head cavity 31, with the inlet end of the exhaust pipe 52 higher than the inner wall of the float head cavity 31 near the cold medium cavity 23. A flow guiding gap is formed between the air inlet end of the exhaust pipe 52 and the inner wall of the float head cavity 31 away from the cold medium cavity 23. The air outlet end of the exhaust pipe 52 should extend out of the pipe box 2 along the assembly hole on the end cap plate 22, and the outer wall of the exhaust pipe 52 is fixedly connected to the inner wall of the assembly hole (for example, by welding).

[0033] Because the inlet of the exhaust pipe 52 is higher than the inner wall of the floating head cavity 31 near the cold medium cavity 23, the cold medium inside the floating head cavity 31 can be prevented from entering the exhaust pipe 52. When some of the cold medium vaporizes due to the heat exchange process, the vaporized cold medium will enter the exhaust pipe 52 along the guide gap and eventually be discharged to the outside of the device, thus preventing the vaporized cold medium from condensing again in the device. In addition, since there is an expansion and contraction gap between the outer wall of the exhaust pipe 52 and the inner wall of the assembly pipe 51, and there is no connection between the exhaust pipe 52 and the heat exchange tube 4 and the tube sheet 2, when the device expands and contracts due to temperature changes, the exhaust pipe 52 can be prevented from causing undue influence on the tube sheet 2 and the heat exchange tube 4.

[0034] It should be noted that after the vaporized cold medium is discharged to the outside through the exhaust assembly, the staff should replenish the cold medium into the device according to the actual situation to ensure that the device can meet the condensation requirements of the material components.

[0035] As another optional embodiment, to improve the stability of the heat exchange tube 4 and the assembly tube 51, multiple positioning plates 6 can be provided between the tube box 2 and the floating head 3. Each positioning plate 6 has a first receiving hole for accommodating the heat exchange tube 4 and a second receiving hole for accommodating the assembly tube 51. Correspondingly, the positioning plate 6 should be connected to the tube sheet 21 via a tie rod 61, and a spacer tube should also be provided on the tie rod 61, thereby further improving the structural stability of the device with the help of the tie rod 61.

[0036] In addition, a heat medium jacket 8 may be provided outside the tube box 2 of this device, and a heat medium inlet pipe 73 and a heat medium outlet pipe 74 are provided on the heat medium jacket 8, so that the operator can introduce the same heat medium (such as heat transfer oil) as the short-path evaporator 1 into the heat medium jacket 8 during the material handling process.

[0037] Figure 4 This diagram illustrates the pipe arrangement of the device. To facilitate the separation and discharge of different components from the material, the pipe box 2 may also be equipped with a light fraction discharge pipe 75, a heavy fraction discharge pipe 76, and a vacuum pipe 77. Operators can arrange the various pipes around the device according to the actual conditions of the work site to facilitate operation.

[0038] The effects of the above solution are explained below:

[0039] This embodiment provides a short-range evaporator with an integrated condenser. A reinforced sleeve enhances the connection stability between the heat exchange tubes and the tube sheet, preventing the heat exchange tubes from breaking due to excessive vibration loads during operation. Furthermore, this device can discharge the vaporized cold medium through an exhaust assembly, thus preventing repeated vaporization and condensation of the cold medium within the device and reducing thermal fatigue within the condenser.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A short-path evaporator with a built-in condenser, characterized in that, include: The tube box (2), floating head (3), heat exchange tube assembly, and exhaust assembly are provided. The tube box (2) is provided with tube sheet (21) and end plate (22), and a cold medium cavity (23) is formed between tube sheet (21) and end plate (22). A floating head cavity (31) is provided inside the floating head (3). The heat exchange tube assembly includes multiple heat exchange tubes (4), and one end of the heat exchange tube (4) is connected to the cold medium cavity (23), and the other end is connected to the floating head cavity (31). The tube sheet (21) is provided with connection holes for accommodating the heat exchange tubes (4), and a reinforcing sleeve (24) for improving the stability of the heat exchange tubes (4) is fixed at the end of the connection hole near the floating head (3). The exhaust assembly includes an assembly pipe (51) and an exhaust pipe (52). One end of the assembly pipe (51) is... One end of the exhaust pipe (52) is connected to the cold medium cavity (23), and the other end is connected to the floating head cavity (31). The exhaust pipe (52) is placed inside the assembly pipe (51), and an expansion gap is formed between the outer side wall of the exhaust pipe (52) and the inner side wall of the assembly pipe (51). The air inlet end of the exhaust pipe (52) is inserted into the floating head cavity (31). The air inlet end of the exhaust pipe (52) is higher than the inner side wall of the floating head cavity (31) and close to the cold medium cavity (23). A flow guiding gap is formed between the air inlet end of the exhaust pipe (52) and the inner side wall of the floating head cavity (31) away from the cold medium cavity (23). The air outlet end of the exhaust pipe (52) extends to the outside of the pipe box (2) along the assembly hole on the end cap plate (22), and the outer side wall of the exhaust pipe (52) is fixedly connected to the inner side wall of the assembly hole.

2. The short-path evaporator with built-in condenser according to claim 1, characterized in that: The heat exchange tube (4) is provided with an expansion reinforcement section (41) and a connecting section (42) at its end, and the connecting section (42) is connected to the heat exchange tube (4) through the expansion reinforcement section (41); the expansion reinforcement section (41) is located at the junction of the reinforcing sleeve (24) and the connecting hole, the end of the connecting section (42) is inserted into the cold medium cavity (23), and the outer wall of the connecting section (42) is fixedly connected to the tube sheet (21).

3. The short-path evaporator with built-in condenser according to claim 1, characterized in that: Multiple positioning plates (6) are provided between the tube box (2) and the floating head (3). The positioning plates (6) are provided with a first receiving hole for accommodating the heat exchange tube (4) and a second receiving hole for accommodating the assembly tube (51).

4. A short-range evaporator with a built-in condenser according to claim 3, characterized in that: The positioning plate (6) is connected to the tube sheet (21) via a pull rod (61).

5. A short-path evaporator with a built-in condenser according to claim 1, characterized in that: The side wall of the pipe box (2) is provided with a cold medium inlet pipe (71) and a cold medium outlet pipe (72), and both the cold medium inlet pipe (71) and the cold medium outlet pipe (72) are connected to the cold medium cavity (23).

6. A short-path evaporator with a built-in condenser according to claim 1, characterized in that: The outside of the pipe box (2) is provided with a heat medium jacket (8), and a heat medium inlet pipe (73) and a heat medium outlet pipe (74) are provided on the heat medium jacket (8).

7. A short-path evaporator with a built-in condenser according to claim 1, characterized in that: The tube box (2) is also equipped with a light fraction discharge pipe (75), a heavy fraction discharge pipe (76), and a vacuum pipe (77).

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