Reboiler based on multi-channel spiral groove structure

Abstract

The application discloses a reboiler based on a multi-flow channel spiral groove structure, which comprises a shell, pipe plates are arranged at two ends of the shell, a plurality of heat exchange pipes are fixed in parallel between the pipe plates, a plurality of baffle plates are arranged perpendicularly to the heat exchange pipes, characterized in that the baffle plates are provided with pipe holes corresponding to the heat exchange pipes one by one, the baffle plates are divided into a liquid flow area at the bottom and a gas flow area at the top, and spiral grooves are arranged on the inner walls of the pipe holes in the liquid flow area. The spiral grooves are etched on the inner walls of the pipe holes of the bottom baffle plates to enhance turbulent flow, and air holes arranged uniformly around the pipe holes of the top are arranged to promote gas-liquid separation; the hexagonal baffle plate pipe hole structure is adopted, so that the heat transfer efficiency is obviously improved, the scaling is reduced, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of heat transfer equipment in petrochemical industry, and specifically relates to a reboiler based on a multi-channel spiral groove structure. Background Technology

[0002] In distillation column systems used in petrochemical and fine chemical industries, shell-and-tube reboilers play a crucial role, providing the necessary heat and vaporization medium for the distillation process. As its core heat transfer element, the support and fluid guidance of the tube bundle primarily rely on baffles. Traditionally, baffle designs have generally used circular perforations to fix the heat exchange tube bundles. However, this seemingly simple design has revealed significant limitations in actual operation, becoming a key factor restricting equipment efficiency and reliability.

[0003] The primary problem lies in the uneven fluid distribution. The regular channels formed by the circular tube openings make it difficult to effectively guide the complex gas-liquid two-phase mixture to achieve an ideal flow pattern in the shell side (the space outside the tube bundle). The fluid (especially high-viscosity media or media containing solid particles) is prone to flow deviation or short-circuiting between the tubes, with some areas having excessively low flow velocities or even stagnant zones, while other areas have excessively high flow velocities. This uneven flow distribution directly leads to a significant decrease in heat transfer efficiency—insufficient heat exchange in low-velocity zones, and excessive scouring in high-velocity zones with insufficient heat exchange time, resulting in the overall inability to fully utilize the heat exchange area and increased energy consumption.

[0004] Secondly, scaling at the bottom of the tube bundle is a particularly prominent problem. During reboiler operation, the heated medium boils on the tube bundle surface, generating steam. Under gravity, the liquid components and carried solid particles, high-boiling-point impurities, etc., easily settle and accumulate in the low-lying area of ​​the tube bundle (i.e., the bottom of the tube bundle). Traditional circular tube baffle structures lack an effective solution to this problem. The flow in this area is often relatively sluggish, with low turbulence and weak scouring, providing a breeding ground for impurity deposition, polymerization reactions, or crystallization. The resulting stubborn fouling not only constitutes additional thermal resistance, further weakening heat transfer performance, but also gradually reduces the flow cross-section, increases pressure drop, and in severe cases, even blocks the flow channel, forcing frequent equipment shutdowns for cleaning.

[0005] Therefore, a new type of reboiler is needed to solve the above problems. Utility Model Content

[0006] To address the shortcomings of the prior art, this application provides a reboiler based on a multi-channel spiral groove structure, which can solve the problems of uneven fluid distribution and low heat transfer efficiency.

[0007] The technical effect to be achieved in this application is accomplished through the following solution: According to a first aspect of this application, a reboiler based on a multi-channel spiral groove structure is provided, including a shell, tube sheets at both ends of the shell, a plurality of heat exchange tubes fixed in parallel between the tube sheets, a plurality of baffles arranged perpendicular to the heat exchange tubes, tube holes corresponding one-to-one with the heat exchange tubes on the baffles, the baffles being divided into a liquid flow zone at the bottom and a gas flow zone at the top, and spiral grooves being provided on the inner wall of the tube holes located in the liquid flow zone.

[0008] Preferably, the spiral groove has a depth of 0.5-1.2 mm and a pitch of 0.2-0.3 times the pipe diameter.

[0009] Preferably, ventilation holes are provided around the pipe hole located in the airflow zone.

[0010] Preferably, the diameter of the vent hole is 3-5 mm.

[0011] Preferably, the density of the vent holes is greater closer to the center of the airflow zone, and a maximum of 6 vent holes are provided around the perimeter of the pipe hole.

[0012] Preferably, the tube hole has a hexagonal structure.

[0013] Preferably, the center-to-center distance between adjacent tube holes is 1.25 times the diameter of the heat exchange tube.

[0014] According to one embodiment of this application, the beneficial effects of using this reboiler based on a multi-channel spiral groove structure are that spiral grooves are etched on the inner wall of the bottom baffle tube hole to enhance turbulence, and uniformly arranged vent holes are provided around the top tube hole to promote gas-liquid separation; the use of a hexagonal baffle tube hole structure significantly improves heat transfer efficiency, reduces scaling, and extends the service life of the equipment. Attached Figure Description

[0015] To more clearly illustrate the embodiments of this application or the existing technical solutions, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the tube bundle assembly of a reboiler based on a multi-channel spiral groove structure in one embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] like Figure 1 and Figure 2 As shown, a reboiler based on a multi-channel spiral groove structure in one embodiment of this application includes a shell, with tube sheets 100 at both ends of the shell. A plurality of heat exchange tubes 110 are fixed parallel to each other between the tube sheets 100. A plurality of baffles 200 are arranged perpendicular to the heat exchange tubes 110. Each baffle 200 has a tube hole 210 corresponding to one of the heat exchange tubes 110. The baffle 200 is divided into a liquid flow zone 201 at the bottom and a gas flow zone 202 at the top. Spiral grooves are formed on the inner wall of the tube holes 210 in the liquid flow zone 201. The depth of the spiral grooves is 0.5-1.2 mm, and the pitch is 0.2-0.3 times the tube diameter. The tube holes 210 have a hexagonal structure.

[0019] Spiral grooves, for example, can be fabricated using mechanical or laser etching techniques to enhance fluid turbulence and improve the uniformity of fluid distribution, thereby increasing heat transfer efficiency. Hexagonal orifices 210 improve anti-fouling properties.

[0020] In this embodiment, vent holes 220 are provided around the pipe hole 210 located in the airflow zone 202. The diameter of the vent holes 220 is 3-5 mm. The closer to the center of the airflow zone 202, the greater the density of the vent holes 220, with a maximum of 6 vent holes 220 provided around the pipe hole 210. The center distance between adjacent pipe holes 210 is 1.25 times the diameter of the heat exchange tube 110.

[0021] The vent 220 promotes rapid steam release, thereby optimizing fluid flow and heat transfer mechanisms, significantly improving the thermal efficiency of the reboiler, and reducing energy consumption.

[0022] The tube hole 210 in this application is formed by CNC drilling to ensure a machining accuracy of ±0.1mm.

[0023] According to one embodiment of this application, the beneficial effects of using this reboiler based on a multi-channel spiral groove structure are that spiral grooves are etched on the inner wall of the bottom baffle 200 tube hole 210 to enhance turbulence, and vent holes 220 are uniformly arranged around the top tube hole 210 to promote gas-liquid separation; the use of a hexagonal baffle 200 tube hole 210 structure significantly improves heat transfer efficiency, reduces scaling, and extends the service life of the equipment.

[0024] It should be noted that the above detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0027] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] In the detailed description above, reference has been made to the accompanying drawings, which form part of this document. In the drawings, similar symbols typically identify similar parts unless the context otherwise indicates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not intended to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.

[0030] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A reboiler based on multi-channel spiral groove structure, comprising a shell, both ends of the shell are provided with tube sheets, a plurality of heat exchange tubes are fixed between the tube sheets in parallel, a plurality of baffle plates are arranged perpendicularly to the heat exchange tubes, characterized in that, The baffle plate is provided with tube holes that correspond one-to-one with the heat exchange tubes. The baffle plate is divided into a liquid flow zone at the bottom and an air flow zone at the top. The inner wall of the tube hole located in the liquid flow zone is provided with spiral grooves.

2. The reboiler based on a multi-channel spiral groove structure according to claim 1, characterized in that, The spiral groove has a depth of 0.5-1.2 mm and a pitch of 0.2-0.3 times the pipe diameter.

3. The reboiler based on a multi-channel spiral groove structure according to claim 1, characterized in that, Ventilation holes are provided around the pipe located in the airflow zone.

4. The reboiler based on a multi-channel spiral groove structure according to claim 3, characterized in that, The diameter of the vent is 3-5 mm.

5. The reboiler based on a multi-channel spiral groove structure according to claim 3, characterized in that, The closer to the center of the airflow zone, the greater the density of the vent holes, with a maximum of 6 vent holes arranged around the perimeter of the pipe.

6. The reboiler based on a multi-channel spiral groove structure according to any one of claims 1 to 5, characterized in that, The tube hole has a hexagonal structure.

7. The reboiler based on a multi-channel spiral groove structure according to claim 6, characterized in that, The center-to-center distance between adjacent tube holes is 1.25 times the diameter of the heat exchange tube.

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