Jet heat exchanger

Abstract

The invention relates to the technical field of tubular heat exchangers, in particular to a jet heat exchanger. The axis of the horizontal structure is longitudinally horizontal; comprising a left tube box, a left tube plate, a left barrel, a conical section, a barrel, a right tube plate and a right tube box which are sequentially connected from left to right. The heat exchanger further comprises a medium inlet, a medium outlet, heat exchange tubes and baffle plates. The medium inlet is vertically arranged and is vertically and fixedly connected to the top of the left barrel body; the medium outlet is vertically arranged and is vertically and fixedly connected to the bottom of the right end of the cylinder body; the plurality of baffle plates are vertically arranged and are fixedly connected into the cylinder body; the axes of the heat exchange tubes are longitudinally horizontal, and the two ends are connected with the left tube plate and the right tube plate respectively. The flow field distribution is relatively uniform, almost no heat transfer dead zone exists, the shear stress between the tube bundle and the supporting structure is effectively reduced, the transverse scouring to the tube bundle is also eliminated, the fluid induced vibration is effectively eliminated, and the wear of the tube bundle is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tubular heat exchangers, in particular to a jet heat exchanger. Background Art

[0002] Shell and tube heat exchanger is also called shell and tube heat exchanger. It is a wall heat exchanger that uses the wall of the heat exchange tube bundle enclosed in the shell as the heat transfer surface. This heat exchanger has the advantages of simple structure, low cost, wide flow cross section, easy to clean scale, etc.; its disadvantages are low heat transfer coefficient and large floor space. Shell and tube heat exchanger can be made of various structural materials (mainly metal materials), can be used under high temperature and high pressure, and is the most widely used type of heat exchanger.

[0003] At present, tubular heat exchangers usually use baffles or support plates as the supporting structure of the tube bundle, and the fluid flows through the tube bundle multiple times along the specified path to improve the heat transfer coefficient of the shell side. However, since the fluid needs to cross the tube bundle multiple times, repeatedly changing the flushing direction, and the flushing angle is roughly vertical, the flow resistance of the fluid is very large, there is a dead zone in the local flow, and it is easy to cause induced vibration, resulting in vibration wear of the heat exchange tube, and finally causing leakage of the heat exchange tube. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a jet heat exchanger, which not only has a relatively uniform flow field distribution and almost no heat transfer dead zone, but also effectively reduces the shear stress between the tube bundle and the supporting structure, and also eliminates the lateral scouring of the tube bundle, effectively eliminates the fluid-induced vibration, and reduces the wear of the tube bundle.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A jet heat exchanger is a horizontal structure with a longitudinal axis horizontal; it includes a left tube box, a left tube sheet, a left cylinder, a cone section, a cylinder, a right tube sheet and a right tube box connected in sequence from left to right; it also includes a medium inlet, a medium outlet, a heat exchange tube and a baffle; the medium inlet is vertically arranged and vertically fixed to the top of the left cylinder; the medium outlet is vertically arranged and vertically fixed to the bottom of the right end of the cylinder; a plurality of baffles are vertically arranged and fixed in the cylinder; the axis of the heat exchange tube is longitudinally horizontal, and the two ends are respectively connected to the left tube sheet and the right tube sheet.

[0007] Furthermore, the heat exchange tubes are arranged in a square or a corner square. The heat exchange tubes can be plain tubes or high-efficiency heat exchange tubes.

[0008] Furthermore, the baffle is a whole baffle with a regular hexagonal tube opening, and the outer diameter of the heat exchange tube is tangent to the regular hexagonal tube opening; after the heat exchange tube is installed, gaps are left at the six inner corners of the regular hexagonal tube opening; and jet holes are opened between adjacent regular hexagonal tube openings.

[0009] Furthermore, the regular hexagonal pipe openings are in the same direction or adjacent regular hexagonal pipe openings are rotated 90 degrees and arranged alternately. When installed in a heat exchanger, one baffle plate can be used, or two baffle plates can be installed alternately.

[0010] Furthermore, the baffle is fixedly connected to the left tube sheet via a tie rod and a distance tube.

[0011] Furthermore, the inner diameter of the left cylinder is larger than the inner diameter of the cylinder.

[0012] Furthermore, it also includes a guide tube, which is fixed to the inner wall of the cone section and is located inside the left cylinder body and the cone section.

[0013] The left cylinder is connected to the cylinder through the cone section 6, the guide cylinder 7 is welded to the cone section 6, and there is a medium flow channel between the left cylinder and the guide cylinder. The medium flows into the cylinder through the gap between the guide cylinder and the left tube sheet, and the medium inlet is welded to the left cylinder.

[0014] Furthermore, the inner diameter of the guide tube is larger than the inner diameter of the cylinder.

[0015] Furthermore, the heat exchange tube openings of the left tube sheet and the right tube sheet are consistent, and the left tube sheet is provided with a tie rod hole. The outer diameter of the left tube sheet is greater than the outer diameter of the right tube sheet. The left tube sheet is adapted to the left cylinder.

[0016] Furthermore, it also includes an anti-collision plate, which is fixed in the left pipe box.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention is a horizontal structure, with the axis horizontal in the longitudinal direction, the left tube box, the left tube sheet, the left cylinder, the cone section, the cylinder, the right tube sheet and the right tube box are connected in sequence, the medium inlet is vertically arranged and vertically fixed to the top of the left cylinder, and the medium outlet is vertically arranged and vertically fixed to the bottom of the right end of the cylinder. The original flow direction of the shell-side fluid, which is mainly transverse flow and cross flow, is changed to longitudinal flow along the axial direction of the shell, which not only makes the flow field distribution more uniform, and there is almost no heat transfer dead zone, but also effectively reduces the shear stress between the tube bundle and the supporting structure, and also eliminates the transverse scouring of the tube bundle, effectively eliminates the fluid-induced vibration, and reduces the wear of the tube bundle.

[0019] 2. The baffles of the present invention are arranged vertically and fixed in the cylinder. The baffles are whole pieces with regular hexagonal nozzles tangent to the heat exchange tubes. After the heat exchange tubes are installed, gaps are left at the six inner corners of the regular hexagonal nozzles. Jet holes are opened between adjacent regular hexagonal nozzles. Since the fluid in the shell flows along the tube bundle, it will generate turbulence when it encounters the baffles. After the intensity of the turbulence decreases, it will encounter the next baffle and generate turbulence again. Such multiple disturbances thin the laminar boundary layer and effectively enhance heat transfer. At the same time, due to the self-cleaning effect of the turbulence, dirt is not easy to deposit.

[0020] 3. The present invention is provided with a guide tube, and the medium inlet adopts a guide tube structure to ensure uniform distribution of the medium inlet and improve the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the left tube sheet structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the right tube sheet structure of the present invention.

[0024] Figure 4 It is a schematic diagram of the overall baffle structure of the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the staggered integral baffles of the present invention.

[0026] In the figure: 1-left tube box 2-anti-collision plate 3-left tube sheet 4-medium inlet 5-left cylinder 6-cone section 7-guide tube 8-baffle 9-cylinder 10-spacer 11-tie rod 12-heat exchange tube 13-nut 14-right tube sheet 15-right tube box 16-medium outlet 17-support 18-tie rod hole 19-regular hexagonal tube mouth 20-jet hole 21-heat exchange tube opening DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of the present invention, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] like Figure 1-5 As shown, a jet heat exchanger is a horizontal structure with a longitudinal axis horizontal. It includes a left tube box 1, a left tube sheet 3, a left cylinder 5, a cone section 6, a cylinder 9, a right tube sheet 14 and a right tube box 15 connected in sequence from left to right and arranged in a coaxial line, with the longitudinal axis horizontally arranged. The left and right ends of the bottom of the cylinder 9 are fixedly connected to the support 17, and the support 17 supports the device.

[0034] It also includes a medium inlet 4, a medium outlet 16, a heat exchange tube 12, a baffle 8, a distance tube 10, a tie rod 11 and an anti-collision plate 2. The axis of the medium inlet 4 is vertical, and it is vertically arranged and fixed to the top of the left cylinder 5. The axis of the medium outlet 16 is vertical, and it is vertically arranged and fixed to the bottom of the right end of the cylinder 9. A plurality of baffles 8 are arranged vertically and evenly fixed in the cylinder 9. The axis of the heat exchange tube 12 is longitudinally horizontal, and the two ends are respectively connected to the left tube sheet 3 and the right tube sheet 14. The anti-collision plate 2 is fixed in the left tube box 1 and is located at the left end.

[0035] The heat exchange tubes 12 are arranged in a square or a corner square. The heat exchange tubes 12 can be plain tubes or high-efficiency heat exchange tubes.

[0036] The baffle plate 8 is a whole baffle plate, and a regular hexagonal tube opening 19 is opened on the baffle plate 8. The outer diameter of the heat exchange tube 12 is tangent to the regular hexagonal tube opening 19. After the heat exchange tube 12 is installed, six inner corners of the regular hexagonal tube opening 19 are left with gaps as medium jet holes. Jet holes 20 are opened between adjacent regular hexagonal tube openings 19, and the jet holes 20 are circular or other shapes.

[0037] The baffles 8 can be arranged alternately with the regular hexagonal tube openings 19 in the same direction or with adjacent regular hexagonal tube openings 19 rotated 90 degrees. When installed in the heat exchanger, one type of baffle 8 can be used, or two types of baffles 8 can be installed alternately.

[0038] The baffle plate 8 is fixedly connected to the left tube sheet 3 through a tie rod 11 , a distance tube 10 and a nut 13 .

[0039] The left cylinder 5 is connected to the cylinder 9 through the cone section 6. The inner diameter of the left cylinder 5 is larger than the inner diameter of the cylinder 9. The guide cylinder 7 is welded to the cone section 6 and is located inside the left cylinder 5 and the cone section 6. There is a medium flow channel between the left cylinder 5 and the guide cylinder 7. The medium flows into the cylinder 9 through the gap between the guide cylinder 7 and the left tube sheet 3. The inner diameter of the guide cylinder 7 is larger than the inner diameter of the cylinder 9.

[0040] The heat exchange tube openings 21 of the left tube sheet 3 and the right tube sheet 14 are consistent, and the left tube sheet 3 is provided with a tie rod hole 18. The outer diameter of the left tube sheet 3 is greater than the outer diameter of the right tube sheet 14. The left tube sheet 3 is adapted to the left cylinder 5.

[0041] The installation process of the present invention is as follows:

[0042] The medium inlet 4 is welded to the left cylinder 5, and the medium outlet 16 is welded to the cylinder 9. The left cylinder 5 is welded to the cone section 6 and the cylinder 9, the guide tube 7 is welded to the cone section 6, and the other end of the left cylinder 5 is welded to the left tube sheet 3. The baffle 8 is a whole baffle, and the baffle has a regular hexagonal tube opening 19. The outer diameter of the heat exchange tube 12 is tangent to the regular hexagonal tube opening 19. After the heat exchange tube 12 is installed, gaps are left at the six inner corners as medium jet holes, and circular jet holes 20 or other shapes of jet holes are opened between adjacent regular hexagonal tube openings 19. The baffle 8 can be in the same direction as the regular hexagonal tube openings 19, or the adjacent regular hexagonal tube openings 19 can be rotated 90° and arranged alternately. When installed in the heat exchanger, one baffle 8 can be used, or two baffles 8 can be installed alternately. The left tube sheet 3 is fixed with the tie rod 11, the first row of distance tubes 10 is installed, and then the first baffle 8 is installed, and the process is repeated in sequence. After the last baffle 8 is installed, it is fixed with the nut 13. After the baffle 8 is fixed, the right end of the cylinder 9 is welded with the right tube sheet 14, and the heat exchange tube 12 is installed to complete the tube bundle manufacturing. The left tube box 1 and the right tube box 15 are manufactured in a conventional manner. The left tube box 1 and the right tube box 15 are connected to the tube bundle with bolts to complete the assembly of the heat exchanger.

[0043] The present invention adopts a guide tube 7 structure at the medium inlet to ensure uniform distribution of the medium inlet and improve the heat exchange effect. The medium enters the cylinder 9 evenly, flows forward along the baffle 8, and is ejected forward through the gaps at the six inner corners of the regular hexagonal nozzle 19 of the baffle 8 and the circular jet holes. After the jet-type integral baffle is used to replace the traditional baffle or support plate, the original shell-side fluid flow direction, which is mainly lateral flow and cross flow, is changed to longitudinal flow along the axial direction of the shell. Not only is the flow field distribution more uniform, there is almost no heat transfer dead zone, and the shear stress between the tube bundle and the support structure is effectively reduced, and the lateral scouring of the tube bundle is eliminated, which effectively eliminates the fluid-induced vibration and reduces the wear of the tube bundle.

[0044] Since the fluid in the shell side flows along the tube bundle, it will generate turbulence when it encounters the baffle. After the intensity of the turbulence decreases, it will encounter the next baffle and generate turbulence again. Such multiple disturbances thin the laminar boundary layer and effectively enhance the heat transfer. At the same time, due to the self-cleaning effect of the turbulence, dirt is not easy to deposit.

[0045] The above descriptions are only some specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A jet heat exchanger, characterized in that: It is a horizontal structure with the longitudinal axis horizontal; It includes a left tube box, a left tube sheet, a left cylinder, a cone section, a cylinder, a right tube sheet and a right tube box which are sequentially connected from left to right; It also includes a medium inlet, a medium outlet, a heat exchange tube and a baffle; the medium inlet is vertically arranged and vertically fixed to the top of the left cylinder; the medium outlet is vertically arranged and vertically fixed to the bottom of the right end of the cylinder; A plurality of baffles are arranged vertically and fixedly connected to the cylinder; The heat exchange tube has a longitudinal axis that is horizontal, and two ends thereof are connected to a left tube sheet and a right tube sheet respectively.

2. A jet heat exchanger according to claim 1, characterized in that: The heat exchange tubes are arranged in a square or a corner square.

3. The jet heat exchanger according to claim 1, characterized in that: The baffle is a whole baffle, the baffle has a regular hexagonal tube opening, and the outer diameter of the heat exchange tube is tangent to the regular hexagonal tube opening; After the heat exchange tubes are installed, gaps are left at the six inner corners of the regular hexagonal tube openings; and jet holes are opened between adjacent regular hexagonal tube openings.

4. A jet heat exchanger according to claim 3, characterized in that: The regular hexagonal pipe openings are in the same direction or adjacent regular hexagonal pipe openings are rotated 90 degrees and arranged alternately.

5. The jet heat exchanger according to claim 1, characterized in that: The baffle is fixedly connected to the left tube sheet through a tie rod and a distance tube.

6. The jet heat exchanger according to claim 1, characterized in that: The inner diameter of the left cylinder is larger than the inner diameter of the cylinder.

7. The jet heat exchanger according to claim 1, characterized in that: It also includes a guide tube, which is fixed to the inner wall of the cone section and is located inside the left cylinder body and the cone section.

8. The jet heat exchanger according to claim 7, characterized in that: The inner diameter of the guide tube is larger than the inner diameter of the cylinder.

9. The jet heat exchanger according to claim 1, characterized in that: The heat exchange tube openings of the left tube sheet and the right tube sheet are consistent, and the left tube sheet is provided with a tie rod hole; the outer diameter of the left tube sheet is greater than the outer diameter of the right tube sheet.

10. The jet heat exchanger according to claim 1, characterized in that: It also includes an anti-collision plate, which is fixed in the left pipe box.

Images