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CN-224230796-U - Shell-and-tube heat exchanger

CN224230796UCN 224230796 UCN224230796 UCN 224230796UCN-224230796-U

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a shell-and-tube heat exchanger, which comprises a shell, wherein both ends of the shell are provided with sealing heads, a spiral baffle plate and a heat exchange tube are arranged in the shell, both ends of the spiral baffle plate are provided with sawtooth baffle plates, and the inner wall of the heat exchange tube is provided with spiral convex ribs which have specific parameters such as rib height, screw pitch, rib thickness, an included angle with the axial direction of the heat exchange tube.

Inventors

  • Chen Jielang

Assignees

  • 广东捷朗热能科技有限公司

Dates

Publication Date
20260512
Application Date
20250616

Claims (7)

  1. 1. A shell-and-tube heat exchanger comprises a shell (1) and is characterized in that sealing heads (2) are arranged at two ends of the shell (1), a spiral baffle plate (10) and a heat exchange tube (8) are arranged inside the shell (1), saw-tooth baffle plates (11) are arranged at two ends of the spiral baffle plate (10), the heat exchange tube (8) penetrates through the spiral baffle plate (10) and the saw-tooth baffle plates (11), and two ends of the heat exchange tube (8) are arranged on the shell (1) through tube plates (9).
  2. 2. A shell-and-tube heat exchanger according to claim 1, characterized in that the outer wall of the heat exchange tube (8) is provided with a nano-hydrophobic coating (13), the thickness of the nano-hydrophobic coating (13) being 50-80nm.
  3. 3. The shell-and-tube heat exchanger according to claim 1, wherein the inner wall of the heat exchange tube (8) is provided with a spiral convex rib (12), the rib height of the spiral convex rib (12) is 0.5-2.0mm, the screw pitch of the spiral convex rib (12) is 5-20mm, the rib thickness of the spiral convex rib (12) is 0.2-0.8mm, the axial included angle between the spiral convex rib (12) and the heat exchange tube (8) is 30-60 degrees, and the distance between two ends of the spiral convex rib (12) and two ends of the heat exchange tube (8) is 5-10mm.
  4. 4. A shell-and-tube heat exchanger as claimed in claim 1, wherein flanges (14) are mounted on both ends of the shell (1) and on both end caps (2), and the flanges (14) on the shell (1) are connected with the flanges (14) on the end caps (2) through fixing bolts (15).
  5. 5. A shell-and-tube heat exchanger according to claim 4, wherein a sealing ring (16) is arranged between the two flanges (14), the sealing ring (16) being arranged in an "O" shape.
  6. 6. The shell-and-tube heat exchanger of claim 1, wherein the two sealing heads (2) are respectively provided with a heat inlet (3) and a heat outlet (4), the upper part of the shell (1) is provided with a cold inlet (5) and a cold outlet (6), the cold inlet (5) and the cold outlet (6) are arranged at two ends, the lower part of the shell (1) is provided with a sewage outlet (7), and the sewage outlet (7) is arranged below the cold outlet (6).
  7. 7. A shell-and-tube heat exchanger as set forth in claim 1, wherein said shell (1) is of a double-layer design, said shell (1) base material is carbon steel, and said shell (1) surface layer is of a corrosion resistant alloy and is bonded by explosion welding.

Description

Shell-and-tube heat exchanger Technical Field The application relates to the technical field of heat exchangers, in particular to a shell-and-tube heat exchanger. Background The heat exchanger plays a vital role as heat exchange equipment widely applied in various fields such as industrial production, energy utilization and the like, can realize heat transfer among different media, effectively improves the energy utilization efficiency, ensures the stable operation of a process flow and the like; for example, in chemical production, reactants are often required to be heated or cooled to meet specific chemical reaction conditions, in the power industry, heat exchangers are used for cooling circulating water of a generator set and the like, and shell-and-tube heat exchangers are widely distributed in a plurality of industrial departments such as petroleum, chemical industry, electric power, pharmacy and the like by virtue of the advantages of firm structure, wide application range, high operation elasticity and the like. In the heat exchange process, the surface of a heat exchange tube of a traditional tube-shell heat exchanger is smooth, when fluid flows in the tube, a boundary layer is easy to form, so that efficient heat transfer is hindered, heat exchange efficiency is difficult to further improve, moreover, if the design of a baffle structure outside the tube is not reasonable enough, the flowing state of shell-side fluid is also influenced, heat cannot be fully exchanged, and the whole heat exchange performance often cannot meet the requirements of industrial application scenes with higher requirements on heat exchange efficiency. In the long-term operation process, because the medium components in the heat exchanger are complex, scaling phenomena are easy to occur on the inner wall and the outer wall of the heat exchange tube, the scaling not only can reduce the effective heat exchange area of the heat exchange tube, but also can increase the flow resistance of fluid and further influence the heat exchange efficiency, and simultaneously, under the working condition that corrosive mediums exist, the shell of the heat exchanger, the heat exchange tube and other parts are easy to corrode, the service life of equipment is reduced, and the maintenance cost and the safety risk are increased. Disclosure of utility model In order to further improve heat exchange efficiency, the application provides a shell-and-tube heat exchanger. The shell-and-tube heat exchanger adopts the following technical scheme that the shell-and-tube heat exchanger comprises a shell, wherein sealing heads are arranged at two ends of the shell, a spiral baffle plate and a heat exchange tube are arranged in the shell, saw-tooth baffle plates are arranged at two ends of the spiral baffle plate, the heat exchange tube penetrates through the spiral baffle plate and the saw-tooth baffle plates, and two ends of the heat exchange tube are arranged on the shell through tube plates. Optionally, the outer wall of the heat exchange tube is provided with a nano hydrophobic coating, and the thickness of the nano hydrophobic coating is 50-80nm. Optionally, the inner wall of the heat exchange tube is provided with a spiral convex rib, the rib height of the spiral convex rib is 0.5-2.0mm, the pitch of the spiral convex rib is 5-20mm, the rib thickness of the spiral convex rib is 0.2-0.8mm, the axial included angle between the spiral convex rib and the heat exchange tube 8 is 30-60 degrees, and the distance between two ends of the spiral convex rib and two ends of the heat exchange tube is 5-10mm. Optionally, flanges are installed on both ends of the shell and both the sealing heads, and the flanges on the shell are connected with the flanges on the sealing heads through fixing bolts. Optionally, a sealing ring is arranged between the two flange plates, and the sealing ring is in an 'O' -shape. Optionally, two be provided with into hot mouth and play hot mouth on the head respectively, shell upper portion is provided with into cold mouth and goes out cold mouth, advance cold mouth with go out cold mouth setting is at both ends, the shell lower part is provided with the drain, the drain sets up go out cold mouth below. Optionally, the shell is of a double-layer design, the shell base material is carbon steel, and the shell surface layer is made of corrosion-resistant alloy and is combined through explosion welding. In summary, the application has the following beneficial technical effects: 1. The heat exchange tube has the advantages that the spiral convex ribs are arranged on the inner wall of the heat exchange tube and have specific parameters such as rib height, screw pitch, rib thickness, an included angle with the axial direction of the heat exchange tube and the like, the structure can destroy the formation of a boundary layer when fluid flows in the tube, enhance the disturbance of the fluid, and accordingly effectively improve the heat exchange e