Reboiler

Abstract

The utility model relates to the technical field of reboilers, in particular to a reboiler which comprises a container body, a heat exchange structure is arranged in the middle of the container body, and the container body is divided into a feeding space and a gas outlet space by the heat exchange structure. A feeding opening and an air outlet which are communicated with the feeding space and the air outlet space are formed in the two ends of the container body respectively, a steam inlet and a condensate outlet which are communicated with the heat exchange structure are formed in the two opposite sides of the container body respectively, and a non-condensable air pipe is arranged in the heat exchange structure in the length direction of the container body; the air outlet end of the non-condensable air pipe is installed on the side wall of the end, close to the steam inlet, of the container body in a penetrating mode, and a plurality of penetrating holes are formed in the circumferential side of the other end of the non-condensable air pipe. The reboiler is simple in structure, high in heat exchange efficiency and good in steam fluidity.

Description

Technical Field

[0001] This utility model relates to the field of reboiler technology, and specifically to a reboiler. Background Technology

[0002] A reboiler is a device that uses heating to vaporize a liquid, thereby achieving material circulation and separation. There are various types of reboilers, among which the thermosiphon reboiler is a common type. The thermosiphon reboiler utilizes the density difference between the liquid and the vaporized product to form a natural circulation, without the need for external pump support.

[0003] For example, the patent with publication number CN112370800A discloses a high-efficiency reboiler. Although the space between the upper tube sheet and the lower tube sheet forms a heat exchange space with an air inlet at the top and a liquid outlet at the bottom, the hot steam in the heat exchange space can only be discharged through the liquid outlet after liquefaction. After continuous heat exchange with the heat exchange tubes between the upper and lower tube sheets, the steam temperature decreases closer to the liquid outlet. Although the steam temperature near the liquid outlet is relatively low, some steam has not yet reached the liquefaction temperature. In actual use, the heat exchange efficiency is almost directly proportional to the temperature difference. The inlet continuously supplies high-temperature fresh steam, which causes the pressure in the entire heat exchange space to gradually increase until it reaches an equilibrium with the pressure in the inlet or the inlet system. Although the high pressure can increase the steam temperature at the liquid outlet to some extent, it does not increase the steam temperature in the inlet area. Therefore, it does not significantly improve the heat exchange efficiency of the entire reboiler. The high pressure environment also places higher demands on the gas supply system and the structure of the reboiler. Meanwhile, the high-pressure environment causes the condensate near the liquid outlet to vaporize again, reaching a state of vapor-water saturation. In addition to absorbing the heat of the remaining steam, the water droplets carried in the steam reduce the steam's fluidity, making it difficult for the high-temperature steam at the air inlet to quickly enter the liquid outlet area. This structure results in high heat exchange efficiency at the end of the heat exchange tube near the air inlet, while the heat exchange efficiency decreases as it gets closer to the liquid outlet. Utility Model Content

[0004] In order to overcome one of the shortcomings of the prior art, the purpose of this utility model is to provide a reboiler with high heat exchange efficiency and good steam flow.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A reboiler includes a container body with a heat exchange structure in the middle, which divides the container body into a feed space and an outlet space. A feed inlet and an outlet communicating with the feed space and outlet space are respectively provided at both ends of the container body. A steam inlet and a condensate outlet communicating with the heat exchange structure are respectively provided on opposite sides of the container body. A non-condensable gas pipe is provided within the heat exchange structure along the length of the container body. One end of the non-condensable gas pipe is installed through and mounted on the side wall of the container body near the steam inlet. Several perforations are provided on the circumference of the other end of the non-condensable gas pipe.

[0007] Furthermore, the diameter and number of the perforations are larger and greater the closer they are to the condensate outlet.

[0008] Furthermore, the opening of the perforation is oriented in the same direction as the steam flow within the heat exchange structure.

[0009] Furthermore, the heat exchange structure includes an upper tube sheet and a lower tube sheet, which respectively divide the container body into an outlet space, a heat exchange space, and a feed space. The upper tube sheet and the lower tube sheet are connected by a plurality of heat exchange tubes, which connect the outlet space and the feed space. A plurality of baffles are provided between the upper tube sheet and the lower tube sheet, and all the baffles divide the heat exchange space into a serpentine heat exchange channel. The steam inlet and the condensate outlet are respectively located at both ends of the heat exchange channel. One end of the non-condensable gas tube is connected to the lower tube sheet, and the other end passes through the upper tube sheet and the outlet space in sequence and is fixed to the side wall of the container body.

[0010] Furthermore, the upper tube sheet is provided with several tie rods, which pass through the baffle plate, and locking nuts are provided on both sides of the tie rods located on the baffle plate.

[0011] Furthermore, a rectifier plate is provided in the feed inlet within the feed space, and the rectifier plate is located on the side of the feed inlet close to the heat exchange structure.

[0012] Furthermore, a baffle is provided on the side of the rectifier plate away from the feed inlet, and limit plates are provided on both sides of the rectifier plate.

[0013] Furthermore, the container body is provided with operating ports in both the feeding space and the venting space, and the operating ports are sealed with caps.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention relates to a reboiler that incorporates a non-condensable gas pipe on the existing vessel body. This pipe allows low-temperature steam near the condensate outlet to be discharged, facilitating steam flow within the heat exchange structure, increasing the overall average steam temperature, and improving overall heat exchange efficiency. It also reduces the internal pressure of the heat exchange structure, thus lowering its requirements and reducing equipment costs. Furthermore, the discharged low-temperature steam quickly carries away a large number of water droplets condensed in the condensate outlet area, preventing these droplets from being re-evaporated by the high-temperature steam and thus reducing the temperature of the steam near the condensate outlet.

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0018] Figure 2 This is a structural diagram of the non-condensable gas tube in an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure between the rectifier plate and the feed inlet in an embodiment of this utility model.

[0020] Explanation of icon numbers:

[0021] Container body 10, feed space 11, exhaust space 12, feed port 13, exhaust port 14, steam inlet 15, condensate outlet 16, rectifier plate 17, baffle 18, limiting plate 19, operation port 1a, secondary steam inlet 1b, heat exchange structure 20, upper tube sheet 21, lower tube sheet 22, heat exchange tube 23, baffle plate 24, heat exchange channel 25, tie rod 26, non-condensable gas tube 30, perforation 31. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0023] Reference Figures 1 to 3A reboiler is shown, comprising a container body 10. A heat exchange structure 20 is provided in the middle of the container body 10, which divides the container body 10 into a feed space 11 and an outlet space 12. A feed inlet 13 and an outlet 14 communicating with the feed space 11 and the outlet space 12 are respectively provided at both ends of the container body 10. A steam inlet 15 and a condensate outlet 16 communicating with the heat exchange structure 20 are respectively provided on opposite sides of the container body 10. A non-condensable gas pipe 30 is provided inside the heat exchange structure 20 along the length of the container body 10. One end of the non-condensable gas pipe 30 is installed through and mounted on the side wall of the container body 10 near the steam inlet 15. A plurality of perforations 31 are provided on the periphery of the other end of the non-condensable gas pipe 30.

[0024] In fact, the container body 10 can be a conventional reboiler structure, and the heat exchange structure 20 can also be a conventional heat exchange structure. Of course, the above structures can all adopt the technical solution in patent CN112370800A - A High-Efficiency Reboiler, which will not be described in detail here. The non-condensable gas pipe 30 has a closed end with a perforation 31, and the gas outlet end of the non-condensable gas pipe 30 passes through the side wall of the container body 10 and forms a connector. This design is mainly to facilitate the connection to the steam recovery system and realize the recovery and reuse of this part of the low-temperature steam.

[0025] This reboiler incorporates a non-condensable gas pipe 30 on top of the existing vessel body 10. This pipe 30 discharges the low-temperature steam near the condensate outlet 16, facilitating steam flow within the heat exchange structure 20, increasing the overall average steam temperature, and improving overall heat exchange efficiency. It also reduces the internal pressure of the heat exchange structure 20, thus lowering its requirements and reducing equipment costs. Furthermore, the discharged low-temperature steam quickly carries away a large number of water droplets condensed in the condensate outlet 16 area, preventing these droplets from undergoing secondary evaporation by the high-temperature steam and thus reducing the temperature of the steam near the condensate outlet 16.

[0026] Furthermore, in order to improve the steam discharge capacity near the condensate outlet 16, in an improved embodiment of this application, the diameter and number of the perforations 31 are larger and more numerous closer to the condensate outlet 16. In fact, in the above embodiments, the number of perforations 31 is selected according to actual design requirements, and the number of perforations 31 is smaller closer to the gas outlet end of the non-condensable gas pipe 30, or even none at all.

[0027] In the above embodiment, in order to prevent the flowing steam from entering the non-condensable gas pipe 30 too quickly and being discharged, the opening of the perforation 31 is oriented in the same direction as the steam flow direction in the heat exchange structure 20.

[0028] See Figure 1 To achieve efficient heat exchange, the heat exchange structure 20 in this application can adopt a conventional siphon heat exchange structure design. In one embodiment of this application, the heat exchange structure 20 includes an upper tube sheet 21 and a lower tube sheet 22, which respectively divide the container body 10 into an outlet space 12, a heat exchange space, and a feed space 11. The upper tube sheet 21 and the lower tube sheet 22 are connected by several heat exchange tubes 23, which connect the outlet space 12 and the feed space 11. Several baffles 24 are provided between the upper tube sheet 21 and the lower tube sheet 22, and all the baffles 24 divide the heat exchange space into serpentine heat exchange channels 25. The steam inlet 15 and the condensate outlet 16 are respectively located at both ends of the heat exchange channel 25. One end of the non-condensable gas pipe 30 is connected to the lower tube sheet 22, and the other end passes through the upper tube sheet 21 and the outlet space 12 in sequence, and is fixed to the side wall of the container body 10.

[0029] In the above embodiment, the upper tube sheet 21 and the lower tube sheet 22 respectively isolate the container body 10. The main purpose is to ensure that the outlet space 12 and the feed space 11 can only be connected through the heat exchange tube 23. This allows the material in the feed space 11 to enter the heat exchange tube 23 under high pressure. The high-temperature steam in the heat exchange space heats the heat exchange tube 23 and the material inside, causing some components or the entire material to evaporate and enter the outlet space 12. The high-temperature steam is cooled by the heat exchange tube 23 and then condenses, adhering to the outside of the heat exchange tube 23 to form water droplets. These water droplets accumulate and flow downwards, guided by multiple layers of baffles 24, eventually flowing into the condensate outlet 16 and being discharged outwards. Some uncondensed steam flows along the heat exchange channel 25 and eventually accumulates near the condensate outlet 16. This steam, in addition to continuing to heat the heat exchange tube 23 and causing condensation, also causes the condensate in this area to be vaporized again. These low-temperature steam eventually enter the non-condensable gas pipe 30 through the perforation 31 and are discharged outwards. This reduces the pressure in the area near the condensate outlet 16, which facilitates the rapid flow of high-temperature steam near the steam inlet 15 along the heat exchange channel 25, thereby increasing the overall average temperature and ensuring heat exchange efficiency.

[0030] In the above embodiments, in order to facilitate the installation and fixing of the baffle plate 24 and to prevent the high-pressure steam from impacting the baffle plate 24 and causing deformation that would affect the flow of steam, a plurality of tie rods 26 are provided on the upper tube plate 21. The tie rods 26 pass through the baffle plate 24, and locking nuts are provided on both sides of the tie rods 26 located on the baffle plate 24.

[0031] See Figure 3Because the material in the feed space 11 needs to maintain a pressure so that it can enter the heat exchange tube 23 and be heated and evaporated, but the material tends to flow directly into the feed space 11 when it enters from the feed inlet 13, in one embodiment of this application, a rectifier plate 17 is provided in the feed inlet 13 within the feed space 11, and the rectifier plate 17 is located on the side of the feed inlet 13 near the heat exchange structure 20. The rectifier plate 17 can prevent newly introduced material from flowing directly into the heat exchange tube 23, thus ensuring that the material is evenly distributed within the feed space 11.

[0032] In the above-described improved embodiment, to further improve the mixing uniformity of the new and old materials, a baffle 18 is provided on the side of the rectifier plate 17 away from the feed inlet 13, and limiting plates 19 are provided on both sides of the rectifier plate 17. The baffle 18 and limiting plates 19 allow the newly introduced material to flow away from the heat exchange tube 23. When the material in the heat exchange tube 23 is evaporated, creating a negative pressure that draws material from the feed space 11, the newly introduced material is drawn towards the inlet end of the heat exchange tube 23, thus ensuring thorough mixing of the new and old materials.

[0033] See you again Figure 1 In this application, to facilitate cleaning of the feeding space 11 and the venting space 12, the container body 10 is provided with an operation port 1a in both the feeding space 11 and the venting space 12, and the operation port 1a is sealed with a cap. In an improved embodiment, a drain pipe is also provided at the bottom of the feeding space 11, and a valve body is provided on the drain pipe.

[0034] See Figure 1 Since the evaporated gas entering the outlet space 12 is prone to condensation due to low temperature during the subsequent transmission of the gas into the separation equipment through the pipeline, in some embodiments, the container body is also provided with a secondary steam inlet 1b that is connected to the outlet space 12. The purpose of this is to provide high-temperature steam to heat the evaporated gas inside the outlet space 12.

[0035] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A reboiler, comprising a container body, wherein a heat exchange structure is disposed in the middle of the container body, the heat exchange structure dividing the container body into a feed space and an outlet space, a feed inlet and an outlet communicating with the feed space and the outlet space, respectively, are disposed at both ends of the container body, and a steam inlet and a condensate outlet communicating with the heat exchange structure are disposed on opposite sides of the container body, characterized in that, A non-condensable gas pipe is provided inside the heat exchange structure along the length of the container body. One end of the non-condensable gas pipe is installed on the side wall of the container body near the steam inlet. Several perforations are provided on the circumference of the other end of the non-condensable gas pipe.

2. A reboiler according to claim 1, characterized in that: The diameter and number of the perforations are larger and greater the closer they are to the condensate outlet.

3. A reboiler according to claim 1, characterized in that: The opening of the perforation faces the same direction as the steam flow within the heat exchange structure.

4. A reboiler according to claim 1, characterized in that: The heat exchange structure includes an upper tube sheet and a lower tube sheet, which divide the container body into an outlet space, a heat exchange space, and a feed space, respectively. The upper tube sheet and the lower tube sheet are connected by a number of heat exchange tubes, which connect the outlet space and the feed space. A number of baffles are provided between the upper tube sheet and the lower tube sheet, and all the baffles divide the heat exchange space into a serpentine heat exchange channel. The steam inlet and the condensate outlet are respectively located at both ends of the heat exchange channel. One end of the non-condensable gas tube is connected to the lower tube sheet, and the other end passes through the upper tube sheet and the outlet space in sequence and is fixed to the side wall of the container body.

5. A reboiler according to claim 4, characterized in that: The upper tube sheet is provided with several tie rods, which pass through the baffle plate. Locking nuts are provided on both sides of the tie rods located on the baffle plate.

6. A reboiler according to claim 1, characterized in that: The feed inlet is located within the feed space and is equipped with a rectifier plate, which is positioned on the side of the feed inlet closest to the heat exchange structure.

7. A reboiler according to claim 6, characterized in that: A baffle is provided on the side of the rectifier plate away from the feed inlet, and limit plates are provided on both sides of the rectifier plate.

8. A reboiler according to any one of claims 1-6, characterized in that: The container body is provided with operation ports in both the feeding space and the venting space, and the operation ports are sealed with caps.

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