A pipe-side inlet structure suitable for high-temperature working conditions

Abstract

The present invention relates to a tube-side inlet structure suitable for high-temperature working conditions, comprising: a tube sheet, a plurality of heat exchange tubes, a flow guide, a partition plate, a sleeve, an inner lining tube, a ceramic fiber felt, a pressure plate and a cone member, wherein the tube-side inlet end of the heat exchange tube is welded to the tube hole of the tube sheet, the flow guide, the partition plate and the cone member are connected by a plurality of first fixing members, the ceramic fiber felt and the pressure plate are clamped between the partition plate and the cone member, the partition plate is provided with a sleeve through-hole matching the sleeve, the sleeve is accommodated in the sleeve through-hole of the partition plate, one free end of the sleeve is sleeved on the tube-side inlet end of the heat exchange tube, the other free end of the sleeve is provided with a boss abutting against the partition plate, the inner lining tube is arranged in the sleeve and the tube-side inlet end of the heat exchange tube, and ceramic fiber paper is provided between the sleeve, the tube-side inlet end of the heat exchange tube and the inner lining tube, thereby preventing cracking at the welding point between the tube sheet and the heat exchange tube.

Description

Technical field

[0001] The present invention relates to the field of heat exchangers, and in particular to a tube-side inlet structure suitable for high-temperature working conditions. [Background Technology]

[0002] A heat exchanger is a device that transfers heat between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified process temperature to meet process requirements. It is also a key device for improving energy efficiency. The heat exchanger industry is used in nearly 30 industries, including HVAC, pressure vessels, reclaimed water treatment equipment, chemicals, and petroleum.

[0003] Please refer to Chinese Patent No. 201811038890.X, which discloses a U-shaped heat exchange tube type heat exchanger, including: a cylinder, several groups of heat exchange tubes and tube sheets, wherein the several groups of heat exchange tubes and tube sheets are all arranged in the cylinder, the tube sheets support the heat exchange tubes, and the tube sheets are provided with tube holes for accommodating the heat exchange tubes. The tube-side inlet ends of the heat exchange tubes are welded to the tube holes of the tube sheets. The defect of this structure is that since the temperature of the heat exchange medium is relatively high before heat exchange, the tube-side inlet ends of the heat exchange tubes are directly welded to the tube holes of the tube sheets. Therefore, when the high-temperature heat exchange medium flows through the tube-side inlet ends of the heat exchange tubes, the high temperature will be transferred to the heat exchange tubes and the tube sheets, thereby causing cracks in the welding points between the heat exchange tubes and the tube sheets, thereby reducing the service life of the heat exchanger.

[0004] In addition, in order to separate the tube side inlet from the tube side outlet, this structure sets a baffle in the center of the right end of the tube sheet. The heat exchange medium enters the heat exchange tube from the lower end of the baffle, exchanges heat in the heat exchange tube, and then comes out from the upper end of the baffle. Similarly, the heat exchange medium will also flow through the baffle and the cylinder before heat exchange, so it will also transfer high temperature to the baffle and the cylinder, thereby causing damage to the baffle and the cylinder.

[0005] Therefore, it is necessary to provide a pipe-side inlet structure suitable for high-temperature working conditions that solves the above technical problems. [Summary of the invention]

[0006] To solve the above problems, the present invention aims to provide a tube-side inlet structure suitable for high-temperature working conditions that can prevent cracking at the welding points between the tube sheet and the heat exchange tube.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a tube-side inlet structure suitable for high-temperature working conditions, comprising: a tube sheet, a plurality of heat exchange tubes, a flow guide, a partition plate, a sleeve, an inner lining tube, a ceramic fiber felt, a pressure plate and a cone member, wherein the tube sheet is provided with a tube hole matching the heat exchange tube, the tube-side inlet end of the heat exchange tube is welded to the tube hole of the tube sheet, the flow guide is welded to the tube sheet, the flow guide, the partition plate and the cone member are connected by a plurality of first fixing members, the ceramic fiber felt is provided with a tube hole matching the heat exchange tube, the tube-side inlet end of the heat exchange tube ... The felt and the pressing plate are clamped between the partition plate and the cone member. The partition plate is provided with a sleeve through-hole matching the sleeve. The sleeve is accommodated in the sleeve through-hole of the partition plate. One of the free ends of the sleeve is sleeved on the tube inlet end of the heat exchange tube and a sealing ring is provided between the two. The other free end of the sleeve is provided with a boss abutting the partition plate. The inner lining tube is provided in the sleeve and the tube inlet end of the heat exchange tube. Ceramic fiber paper is provided between the sleeve, the tube inlet end of the heat exchange tube and the inner lining tube.

[0008] Preferably, a tube-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: the guide member includes: a guide tube, a first connecting flange and a guide plate, the guide tube is welded to the first connecting flange and the tube sheet respectively, the guide plate is connected to the first connecting flange by a plurality of second fixing members, and a distance is provided between the guide plate and the tube sheet.

[0009] Preferably, a pipe-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: a second connecting flange is welded to the wide-mouth free end of the cone member, and the first connecting flange of the guide member, the partition plate and the second connecting flange of the cone member are connected by bolts and nuts.

[0010] Preferably, a pipe-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: the free end of the liner pipe extends out of the pressure plate.

[0011] Preferably, a pipe-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: the inner lining pipe includes a first section, a second section and a third section arranged between the first section and the second section, the diameters of the first section and the second section are equal, the diameter of the third section is smaller than the diameters of the first section and the second section, and the ceramic fiber paper is coated on the third section.

[0012] Preferably, a tube-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: the free end of the tube-side inlet end of the heat exchange tube extends outside the tube sheet.

[0013] Preferably, the pipe-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: the sealing ring is a graphite gasket.

[0014] Preferably, a tube-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: a guiding inner conical surface is provided on the free end of the sleeve that matches the tube-side inlet end of the heat exchange tube.

[0015] Preferably, the pipe-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: the cone member is connected to the heat exchange medium inlet pipe via a flexible connector.

[0016] Preferably, the tube-side inlet structure suitable for high-temperature working conditions in the present invention is further configured as follows: the heat exchange tube is a U-shaped heat exchange tube.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the present invention arranges an inner lining tube in the casing and the tube-side inlet end of the heat exchange tube, and separates the casing and the tube-side inlet end of the heat exchange tube from the inner lining tube by ceramic fiber paper. The heat exchange medium flows into the heat exchange tube through the inner lining tube, thereby preventing the heat exchange medium from transferring high temperature to the tube-side inlet end of the heat exchange tube, protecting the welding point between the tube sheet and the heat exchange tube, and extending the service life. In addition, the cone member in the present invention is connected to the heat exchange medium inlet pipe through a flexible connector, so that the heat exchange medium directly enters the inner lining tube through the cone member, avoiding the high-temperature heat exchange medium from contacting the cylinder and protecting the cylinder. The present invention also separates the tube-side inlet end of the heat exchange tube and the tube-side outlet end of the heat exchange tube by arranging a flow guide welded to the tube sheet, thereby optimizing the structure of the heat exchanger.

Brief Description of the Drawings

[0018] Figure 1 It is a structural schematic diagram of the pipe-side inlet structure in the present invention.

[0019] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0020] Figure 3 This is a structural schematic diagram of the tube-side inlet structure installed in the heat exchanger in the present invention.

[0021] Figures 1 to 3 In: 1. Tube sheet, 10. Tube hole, 2. Heat exchange tube, 20. Tube inlet end, 21. Tube outlet end, 3. Guide member, 30. Guide tube, 31. First connecting flange, 32. Guide plate, 33. Bolts and nuts, 34. Spacing, 4. Partition plate, 40. Casing perforation, 5. Casing, 50. Sealing ring, 51. Guide inner cone, 52. Boss, 6. Liner, 60. First section, 61. Second section, 62. Third section, 63. Ceramic fiber paper, 7. Ceramic fiber felt, 8. Press plate, 9. Cone member, 90. Second connecting flange, 91. Bolts and nuts, 92. Flexible connector, 93. Heat exchange medium inlet pipe, 94. Heat exchange medium outlet pipe, 95. Cylinder. [Specific implementation method]

[0022] The following is a further detailed description of a tube-side inlet structure suitable for high-temperature working conditions according to the present invention through specific embodiments.

[0023] Ginseng Figures 1 to 3 As shown, a tube-side inlet structure suitable for high-temperature working conditions includes: a tube sheet 1, a plurality of U-shaped heat exchange tubes 2, a flow guide 3, a partition plate 4, a sleeve 5, a liner tube 6, a ceramic fiber felt 7, a pressure plate 8 and a cone 9. The tube sheet 1 is provided with tube holes 10 that match the heat exchange tubes 2. The tube-side inlet ends 20 of the heat exchange tubes 2 are welded into the tube holes 10 of the tube sheet 1, and the free ends of the tube-side inlet ends 20 of the heat exchange tubes 2 extend outside the tube sheet 1.

[0024] The flow guide 3 comprises a flow guide tube 30, a first connecting flange 31, and a flow guide plate 32. The flow guide tube 30 is welded to the first connecting flange 31 and the tube sheet 1, respectively. The flow guide plate 32 is connected to the first connecting flange 31 via a plurality of bolts and nuts 33. A gap 34 is provided between the flow guide plate 32 and the tube sheet 1. A second connecting flange 90 is welded to the wide, free end of the cone 9. The first connecting flange 31 of the flow guide 3, the partition plate 4, and the second connecting flange 90 of the cone 9 are connected via a plurality of bolts and nuts 91. The cone 9 is connected to a heat exchange medium inlet pipe 93 via a flexible connector 92.

[0025] The ceramic fiber felt 7 and the pressing plate 8 are clamped between the partition plate 4 and the cone member 9. The partition plate 4 is provided with a sleeve through-hole 40 that matches the sleeve 5. The sleeve 5 is accommodated in the sleeve through-hole 40 of the partition plate 4. The right free end of the sleeve 5 is sleeved on the tube side inlet end 20 of the heat exchange tube 2 and a sealing ring 50 is provided between the two. In this embodiment, the sealing ring 50 is a graphite gasket, and the number of graphite gaskets is two. The right free end of the sleeve 5 is provided with a guiding inner conical surface 51, so that the sleeve 5 can be conveniently sleeved on the tube side inlet end 20 of the heat exchange tube 2. The free end of the left end of the sleeve 5 is provided with a boss 52 that abuts against the partition plate 4. The inner lining tube 6 is arranged in the sleeve 5 and the tube-side inlet end 20 of the heat exchange tube 2. The inner lining tube 6 includes a first section 60, a second section 61 and a third section 62 arranged between the first section 60 and the second section 61. The diameters of the first section 60 and the second section 61 are equal, and the diameter of the third section 62 is smaller than the diameters of the first section 60 and the second section 61. The third section 62 is coated with ceramic fiber paper 63, so that the inner lining tube 6 can be insulated from the sleeve 5 and the tube-side inlet end 20 of the heat exchange tube 2.

[0026] The assembly sequence of the tube-side inlet structure of the present invention is as follows: first, weld the tube-side inlet end 20 of the U-shaped heat exchange tube 2 to the tube hole of the tube sheet 1, then weld the guide tube 30 of the guide member 3 to the tube sheet 1, then put the graphite gasket on the tube head of the tube-side inlet end 20 of the heat exchange tube 2, and then insert the sleeve 5 into the sleeve through-hole 40 of the partition plate 4. After insertion, the right end of the sleeve 5 is sleeved on the tube-side inlet end 20 of the heat exchange tube 2, and the boss 52 at the left end of the sleeve 5 abuts against the side of the partition plate 4. Wrap the ceramic fiber paper 63 on the third section 62 of the inner lining tube 6, then insert the inner lining tube 6 wrapped with the ceramic fiber paper 63 into the casing 5 and the tube inlet end 20 of the heat exchange tube 2, then install the ceramic fiber felt 7 and the pressure plate 8, and the free end of the inner lining tube 6 extends out of the pressure plate 8. Finally, the first connecting flange 31 of the guide member 3, the partition plate 4 and the second connecting flange 90 of the cone member 9 are fastened together by bolts and nuts 91, and the ceramic fiber felt 7 and the pressure plate 8 are clamped therein.

[0027] After the tube-side inlet structure of the present invention is installed in the heat exchanger, its heat exchange principle is as follows: the heat exchange medium enters the cone member 9 from the upper heat exchange medium inlet pipe 93, and the heat exchange medium in the cone member 9 then enters the U-shaped heat exchange tube 2 through the inner lining tube 6. Since the inner lining tube 6 is separated from the sleeve 5 and the tube-side inlet end 20 of the heat exchange tube 2 by the ceramic fiber paper 63, the heat of the high-temperature heat exchange medium will not be transferred to the sleeve 5 and the tube-side inlet end 20 of the heat exchange tube 2 when flowing through the inner lining tube 6, thereby protecting the welding point between the heat exchange tube 2 and the tube sheet 1 and extending the service life of the heat exchanger. The tube side inlet end 20 and the tube side outlet end 21 are separated by a guide tube 30. After entering the heat exchange tube 2, the heat exchange medium exchanges heat with the shell side medium, and then comes out from the tube side outlet end 21 of the heat exchange tube 2. At this time, since the high-temperature heat exchange medium has been cooled after heat exchange, the tube side outlet end 21 of the heat exchange tube 2 can adopt a conventional structure. The heat exchange medium coming out of the tube side outlet end 21 of the heat exchange tube 2 passes through the gap 34 between the guide plate 32 and the tube sheet 1 and returns to the space outside the cone 9, and goes out through the heat exchange medium outlet pipe 94 below, thereby optimizing the structure of the heat exchanger.

[0028] In summary, the present invention arranges an inner lining tube 6 in the sleeve 5 and the tube-side inlet end 20 of the heat exchange tube 2, and separates the sleeve 5, the tube-side inlet end 20 of the heat exchange tube 2 from the inner lining tube 6 by ceramic fiber paper 63. The heat exchange medium flows into the heat exchange tube 2 through the inner lining tube 6, thereby preventing the heat exchange medium from transferring high temperature to the tube-side inlet end 20 of the heat exchange tube 2, protecting the welding point between the tube sheet 1 and the heat exchange tube 2, and extending the service life. In addition, the cone member 9 in the present invention is connected to the heat exchange medium inlet pipe 93 through the flexible connector 92, so that the heat exchange medium directly enters the inner lining tube 6 through the cone member 9, avoiding the high-temperature heat exchange medium from contacting the cylinder 95, and protecting the cylinder 95.

[0029] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some embodiments of its application, and are not intended to limit the present invention. It should be noted that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A pipe-side inlet structure suitable for high-temperature working conditions, characterized in that: include: A tube sheet, several heat exchange tubes, a flow guide, a partition plate, a sleeve, an inner lining tube, a ceramic fiber felt, a pressure plate and a cone member. The tube sheet is provided with a tube hole that matches the heat exchange tube. The tube side inlet end of the heat exchange tube is welded to the tube hole of the tube sheet. The flow guide is welded to the tube sheet. The flow guide, the partition plate and the cone member are connected by several first fixing members. The ceramic fiber felt and the pressure plate are clamped between the partition plate and the cone member. The partition plate is provided with a sleeve through-hole that matches the sleeve. The sleeve is accommodated in the sleeve through-hole of the partition plate. One of the free ends of the sleeve is sleeved on the tube side inlet end of the heat exchange tube and a sealing ring is provided between the two. The other free end of the sleeve is provided with a The boss abuts the partition plate, the inner lining tube is arranged in the tube-side inlet end of the sleeve and the heat exchange tube, and ceramic fiber paper is provided between the tube-side inlet end of the sleeve and the heat exchange tube and the inner lining tube. The guide member includes: a guide tube, a first connecting flange and a guide plate. The guide tube is welded to the first connecting flange and the tube sheet respectively. The guide plate and the first connecting flange are connected by a plurality of second fixing members. There is a distance between the guide plate and the tube sheet. The inner lining tube includes a first section, a second section and a third section arranged between the first section and the second section. The diameters of the first section and the second section are equal, and the diameter of the third section is smaller than the diameters of the first section and the second section. The ceramic fiber paper is coated on the third section.

2. A tube-side inlet structure suitable for high-temperature working conditions according to claim 1, characterized in that: A second connecting flange is welded to the wide-mouth free end of the cone member, and the first connecting flange of the guide member, the partition plate and the second connecting flange of the cone member are connected by bolts and nuts.

3. The tube-side inlet structure suitable for high-temperature working conditions according to claim 1, characterized in that: The free end of the liner tube extends out of the pressing plate.

4. The tube-side inlet structure suitable for high-temperature working conditions according to claim 1, characterized in that: The free end of the tube-side inlet end of the heat exchange tube extends outside the tube plate.

5. The tube-side inlet structure suitable for high-temperature working conditions according to claim 1, characterized in that: The sealing ring is a graphite gasket.

6. The tube-side inlet structure suitable for high-temperature working conditions according to claim 1, characterized in that: A guiding inner conical surface is provided on the free end of the sleeve that matches the tube inlet end of the heat exchange tube.

7. The tube-side inlet structure suitable for high-temperature working conditions according to claim 1, characterized in that: The cone member is connected to the heat exchange medium inlet pipe through a flexible connecting member.

8. The tube-side inlet structure suitable for high-temperature working conditions according to claim 1, characterized in that: The heat exchange tube is a U-shaped heat exchange tube.

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