CN221055586U - U-shaped tube heat exchanger and alkali liquor cooler - Google Patents
U-shaped tube heat exchanger and alkali liquor cooler Download PDFInfo
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- CN221055586U CN221055586U CN202322640564.9U CN202322640564U CN221055586U CN 221055586 U CN221055586 U CN 221055586U CN 202322640564 U CN202322640564 U CN 202322640564U CN 221055586 U CN221055586 U CN 221055586U
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- 239000003513 alkali Substances 0.000 title abstract description 19
- 239000010410 layer Substances 0.000 claims abstract description 71
- 239000011247 coating layer Substances 0.000 claims abstract description 31
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 24
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 239000011651 chromium Substances 0.000 claims description 9
- 229910017052 cobalt Inorganic materials 0.000 claims description 9
- 239000010941 cobalt Substances 0.000 claims description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 239000011701 zinc Substances 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 7
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 7
- 239000010962 carbon steel Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 238000007747 plating Methods 0.000 abstract description 28
- 238000005260 corrosion Methods 0.000 abstract description 20
- 230000007797 corrosion Effects 0.000 abstract description 20
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 8
- 239000002253 acid Substances 0.000 abstract description 4
- 238000003466 welding Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 17
- 238000007772 electroless plating Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 6
- 230000007774 longterm Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 2
- 238000005269 aluminizing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 2
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present disclosure relates to a U-tube heat exchanger and an alkali liquor cooler, comprising a cylinder, a tube plate and a U-tube heat exchanger; the cylinder body comprises a seal head part and a shell side part with a coating film; the U-shaped heat exchange tube comprises a coating part, and a first coating layer is coated on the surface of the coating part; the coating part comprises a bent pipe section of the U-shaped heat exchange pipe, and a first straight pipe section and a second straight pipe section which are connected with two ends of the bent pipe section. The heat exchanger in the alkali liquor cooler is replaced by the U-shaped tube heat exchanger, the shell side part of the U-shaped tube heat exchanger can be subjected to chemical metal plating treatment independently, the problem of leakage of welding seams of the shell side part is fundamentally solved, meanwhile, the shell side part and the local heat exchange tube of the U-shaped tube heat exchanger are respectively subjected to chemical metal plating film layers, the U-shaped tube heat exchanger with uniform metal film layers is prepared, and the U-shaped tube heat exchanger runs for a long time in the strong corrosion environments of alkali liquor and acid liquor.
Description
Technical Field
The disclosure belongs to the field of U-shaped tube heat exchangers, and particularly relates to a U-shaped tube heat exchanger and an alkali liquor cooler.
Background
Most of the existing heat exchangers adopt fixed tube plate heat exchangers, and because of strong corrosiveness of KOH, cracks exist at the butt joint seam of the shell side cylinder body and the position 10mm away from the seam in the long-term operation process of the cooler, so that irregular leakage of equipment is caused.
The existing heat exchanger anticorrosion method adopts a hot dip aluminizing process, so that components contacting corrosive media are uniformly placed in aluminum liquid at 700-720 ℃ for dip plating, but the process is not suitable for small-diameter and thin-wall heat exchange tubes, a certain amount of deformation exists in the heat exchange tubes at the temperature of 700-720 ℃ to cause bending deformation of the heat exchange tubes, secondary stress exists due to the deformation, the nickel plating cannot be eliminated, the process is not suitable for alkali liquid working condition anticorrosion of the heat exchange tubes, and the aluminizing process is not suitable for potassium hydroxide medium working condition; in another heat exchanger anticorrosion method, the heat exchange tube and the inner wall of the shell side of the heat exchanger are coated with the organosilicon modified polyester resin, so that the problems of acid-base corrosion, high-temperature corrosion, abrasion, perforation and the like can be avoided, the service efficiency and service life of the heat exchanger are prolonged, but the corrosion prevention technology has the advantages of poor spraying effect and poor adhesive force of the coating due to small size of the heat exchange tube and small inner diameter of the cylinder, and equipment corrosion is caused.
Disclosure of utility model
The utility model aims at providing a U type pipe heat exchanger and lye cooler, the U type pipe heat exchanger that this disclosure provided has even metal film layer, sealed effectual, long-term operation under the strong corrosive environment of lye and acidizing fluid, shell side portion does not have the crackle and reveal, possess strong corrosion resistance, the corrosion resistance is excellent for the sealing performance of lye cooler obtains effectively promoting, and can not produce thermal stress because of the difference in temperature between tube bank and the casing, make equipment structure more stable, further effectively prolong the availability factor and the life of lye cooler.
In order to achieve the above object, a first aspect of the present disclosure provides a U-tube heat exchanger, which is characterized by comprising a cylinder, a tube sheet and a U-tube heat exchanger; the cylinder body comprises a seal head part and a shell side part with a coating film;
The U-shaped heat exchange tube comprises a coating part, and a first coating layer is coated on the surface of the coating part; the coating part comprises a bent pipe section of the U-shaped heat exchange pipe, and a first straight pipe section and a second straight pipe section which are connected with two ends of the bent pipe section.
Optionally, the thickness of the first coating layer is 30-100 μm, and the first coating layer is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer or a tin layer.
The length of the first straight pipe section is the same as that of the second straight pipe section; the length of the first straight pipe section is more than 150 mm.
Optionally, the bend radius of the bend section is 40mm or more.
Optionally, the outer diameter of the U-shaped heat exchange tube is more than 19mm, and the wall thickness is more than 2 mm; the U-shaped heat exchange tube is one of an alloy steel tube, a carbon steel tube or a stainless steel tube.
Optionally, the inner surface and/or the outer surface of the shell side portion is covered with a second coating layer.
Optionally, the thickness of the second coating layer is 30-100 μm, and the second coating layer is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer or a tin layer.
Optionally, the tube sheet divides the inner cavity of the cylinder into a first chamber and a second chamber;
The first chamber is provided with a first inlet and a first outlet, the U-shaped heat exchange tube is arranged in the second chamber, the U-shaped heat exchange tube is fixedly connected to the tube plate, and the tube side of the U-shaped heat exchange tube is communicated with the first chamber; the second chamber has a second inlet and a second outlet;
the cylinder body is selected from one of an alloy steel cylinder body, a carbon steel cylinder body, a stainless steel cylinder body or a copper alloy cylinder body.
Optionally, the cylinder further comprises a shell side flange, and a third coating layer is coated on the surface of the shell side flange; the thickness of the third coating layer is 30-100 mu m, and the third coating layer is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer or a tin layer.
A second aspect of the present disclosure provides an lye cooler comprising the U-tube heat exchanger of the first aspect of the present disclosure.
Through above-mentioned technical scheme, this disclosure carries out electroless metal coating through shell side portion and the local heat exchange tube to U type pipe heat exchanger respectively, and the preparation obtains U type pipe heat exchanger that has even metal coating, long-term operation under the strong corrosion environment of alkali lye and acidizing fluid, and U type pipe heat exchanger that this disclosure provided possesses strong corrosion resistance, excellent corrosion resistance, and operation is stable, long service life.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic structural diagram of a U-tube heat exchanger provided by the present disclosure.
Fig. 2 is a schematic structural diagram of a partially coated U-shaped heat exchange tube provided in the present disclosure.
Description of the reference numerals
1. Sealing the head part; 2. a tube sheet; 3. u-shaped heat exchange tubes; 4. a shell side section; 5. a first chamber; 6. a second chamber; 7. a shell side flange; 11. a first inlet; 12. a first outlet; 13. a second inlet; 14. a second outlet; 31. a curved pipe section; 32. a first straight pipe section; 33. a second straight pipe section.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
As shown in fig. 1 and 2, a first aspect of the present disclosure provides a U-tube heat exchanger, which is characterized by comprising a cylinder, a tube sheet 2 and a U-tube heat exchanger 3; the cylinder comprises a seal head part 1 and a shell side part 4;
the U-shaped heat exchange tube 3 comprises a coating part, wherein the surface of the coating part is coated with a first coating layer; the coating part comprises a bent pipe section 31 of the U-shaped heat exchange pipe, and a first straight pipe section 32 and a second straight pipe section 33 which are connected with two ends of the bent pipe section.
The U-shaped tube heat exchanger with the uniform metal film layer is good in sealing effect, runs for a long time under the strong corrosion environment of alkali liquor and acid liquor, has no cracks and leakage on the shell side part, has strong corrosion resistance and excellent corrosion resistance, ensures that the sealing performance of the alkali liquor cooler is effectively improved, and the tube bundle and the shell are not thermally stressed due to temperature difference, so that the equipment structure is more stable, and the service efficiency and the service life of the alkali liquor cooler are further effectively prolonged.
In one specific embodiment of the disclosure, the thickness of the first coating layer is 30-100 μm, preferably 30-50 μm, and the first coating layer is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer or a tin layer.
In one embodiment of the present disclosure, as shown in FIG. 2, the first straight tube section 32 is the same length as the second straight tube section 33; the length of the first straight pipe section 32 is 150mm or more.
In one embodiment of the present disclosure, as shown in FIG. 2, the bend radius of the bend section 31 is 40mm or more.
In one specific embodiment of the present disclosure, the U-shaped heat exchange tube 3 has an outer diameter of 19mm or more and a wall thickness of 2mm or more; the U-shaped heat exchange tube 3 is one of an alloy steel tube, a carbon steel tube or a stainless steel tube, and is preferably a carbon steel tube.
In one embodiment of the present disclosure, the inner and/or outer surfaces of the shell side portion 4 are coated with a second coating layer.
In one embodiment of the present disclosure, the second plating layer has a thickness of 30 to 100 μm, preferably 30 to 50 μm, and is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer, or a tin layer, preferably a nickel layer.
In one embodiment of the present disclosure, as shown in fig. 1, the tube sheet 2 divides the interior cavity of the cylinder into a first chamber 5 and a second chamber 6;
The first chamber 5 is provided with a first inlet 11 and a first outlet 12, the U-shaped heat exchange tube 3 is arranged in the second chamber 6, the U-shaped heat exchange tube 3 is fixedly connected to the tube plate 2, and the tube side of the U-shaped heat exchange tube 3 is communicated with the first chamber 5; the second chamber 6 has a second inlet 13 and a second outlet 14;
Further, as shown in fig. 1, the U-shaped tube heat exchanger may include a plurality of U-shaped heat exchange tubes 3 and a plurality of liquid flow tubes uniformly distributed on a radial cross section of the seal housing.
In one embodiment of the disclosure, after the tube side fluid is fed into the first chamber 5 through the first inlet 11, the tube side fluid flows through the U-shaped heat exchange tube 3 and flows out from the first outlet 12; the shell side fluid, after being fed into said second chamber 6 through the second inlet 13, exits through the second outlet 14. In the above embodiment, the tube side means a portion where the fluid flows through and is communicated with the U-shaped heat exchange tube 3, and the shell side means a portion where the fluid flows out of and is communicated with the U-shaped heat exchange tube 3.
The cylinder body is selected from one of an alloy steel cylinder body, a carbon steel cylinder body, a stainless steel cylinder body or a copper alloy cylinder body, and is preferably an alloy steel cylinder body.
In one specific embodiment of the disclosure, the cylinder further comprises a shell side flange 7, and the surface of the shell side flange 7 is covered with a third coating layer; the thickness of the third coating layer is 30-100 mu m, preferably 30-50 mu m, and the third coating layer is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer or a tin layer, preferably a nickel layer.
In the process for coating the shell side part and the U-shaped heat exchange tube, an electroless plating process is adopted, the shell side part and the local U-shaped heat exchange tube are contacted with electroless plating solution after heat treatment, and the replaced target metal is deposited on the inner and outer surfaces of the shell side part and the local U-shaped heat exchange tube, so that the prepared inner and outer surfaces of the U-shaped tube heat exchanger are provided with uniform metal film layers. The method comprises the following specific steps:
S1, performing first heat treatment on the whole shell side part 4, and enabling the heat-treated shell side part 4 to be in contact with an electroless plating solution to form a first plating layer on the inner surface and the outer surface of the shell side part 4;
S2, performing second heat treatment on the bent pipe section 31 of the U-shaped heat exchange pipe, and the first straight pipe section 32 and the second straight pipe section 33 connected with the two ends of the bent pipe section, and enabling the bent pipe section 31, the first straight pipe section 32 and the second straight pipe section 33 after heat treatment to be in contact with the chemical plating solution to form a second coating layer.
In one embodiment of the present disclosure, the first heat treatment comprises: heating the whole shell side part 4 to 550-650 ℃, preserving heat for 0.5-2 h, and then cooling to 25 ℃, wherein the heating temperature is 580-620 ℃ and the heat preservation time is 0.5-1 h;
In one embodiment of the present disclosure, the second heat treatment comprises: heating the local heat exchange tube to 550-650 ℃, preserving heat for 3-10 min, and then slowly cooling to 25 ℃, wherein the heating temperature is preferably 580-620 ℃ and the heat preservation time is 4-6 min;
the length of the straight pipe section connected with the bent pipe section in the local heat exchange pipe is more than 150 mm.
In the embodiment, the chemical plating process is adopted to deposit the target metal on the surface of the heat exchanger, a compact metal plating layer is formed on the surface of the heat exchanger, the thickness of the plating layer is uniform, the corrosion resistance and compactness of the heat exchanger can be further improved, plating can be performed on plating pieces of any shape, the process operation is simple, the cost is low, the waste liquid discharge is less, and the environmental pollution is small; on the other hand, the whole heat treatment is carried out on the shell side part before film coating and the local heat treatment is carried out on the heat exchange tube, so that the deformation caused by the local stress at the bent pipe of the heat exchanger is eliminated, the corrosion of equipment caused by secondary stress is avoided, the equipment structure is more stable, the heat exchanger performance is further improved, and the service life of the heat exchanger is prolonged.
A second aspect of the present disclosure provides an lye cooler comprising the U-tube heat exchanger of the first aspect of the present disclosure.
In one embodiment of the disclosure, as shown in fig. 1, after cooling water is fed into the first chamber 5 through the first inlet 11, the cooling water flows through the U-shaped heat exchange tube 3 and flows out from the first outlet 12; after being fed into said second chamber 6 via the second inlet 13, the lye flows out of the second outlet 14.
The alkali liquor cooler prepared by the method replaces the heat exchanger in the equipment with the U-shaped tube heat exchanger prepared by the method by the conventional fixed plate type heat exchanger, and utilizes the advantage that the U-shaped tube heat exchanger is drawable in a tube bundle to perform chemical metal plating treatment on the shell side part and the heat exchange tube, so that the problem of leakage of welding seams of the shell side part is fundamentally solved, the performance of the alkali liquor cooler is further improved, and the service life of the equipment is prolonged.
The present disclosure is further illustrated by the following examples, but the present disclosure is not limited thereby.
Example 1
A, heating the shell side part of the U-shaped tube heat exchanger to 600 ℃, preserving heat for 0.5h, and slowly cooling to 25 ℃ to obtain a heat-treated shell side part;
b, placing the shell side part subjected to heat treatment in the step a in an electroless plating solution to obtain a shell side with a plating layer, wherein the thickness of the plating layer is 40 mu m. Wherein the material of the shell side part is Q345R material, the chemical plating solution comprises 27g/L nickel sulfate and 12.5g/L sodium hypophosphite, the plating temperature is 90 ℃, the plating is carried out for 4 hours, and the pH value of the chemical plating solution is 5.1;
c, heating the bent pipe section and part of straight pipe section of the heat exchange pipe to 600 ℃, preserving heat for 5min, and slowly cooling to 25 ℃ to obtain the bent pipe section and part of straight pipe section of the heat exchange pipe after heat treatment, wherein the length of part of straight pipe section is 300mm;
d, placing the bent pipe section and part of the straight pipe section of the heat exchange pipe subjected to the heat treatment in the step c into chemical plating solution to obtain the U-shaped heat exchange pipe with the coating layer, wherein the thickness of the coating layer is 40 mu m. Wherein, the bending radius of the bent pipe section of the U-shaped heat exchange pipe is 125mm, the length of the straight pipe section is 300mm, the outer diameter of the U-shaped heat exchange pipe is 19mm, the wall thickness is 2mm, the material of the U-shaped heat exchange pipe is 20 # steel, the electroless plating solution comprises 27g/L nickel sulfate and 12.5g/L sodium hypophosphite, the plating temperature is 90 ℃, the plating time is 4 hours, and the pH value of the electroless plating solution is 5.1.
Example 2
The method of example 1 was used, except that in step b and step d, the thickness of the plating layer was 35. Mu.m.
Example 3
The method of example 1 was used, except that in step b and step d, the thickness of the plating layer was 50. Mu.m.
Comparative example 1
A conventional U-tube heat exchanger wherein the shell side portion does not have a first coating layer and the bent tube section and a portion of the straight tube section of the U-tube heat exchanger do not have a second coating layer.
Test case
The U-tube heat exchangers prepared in examples 1 to 3 and comparative example 1 were applied to the lye cooler for 12 months, 36 months and 60 months, and the sealability of the lye cooler was tested, and the test results are shown in Table 1.
TABLE 1
According to the test results of table 1, it can be seen that, compared with the comparative example, the U-shaped tube heat exchanger prepared by the preparation method provided by the disclosure can realize long-term operation in a strong corrosion environment of alkali liquor and acid liquor, no crack and irregular leakage exist in the shell side part, has strong corrosion resistance and excellent corrosion resistance, and the U-shaped tube heat exchanger prepared by the disclosure is applied to an alkali liquor cooler for operation, so that the sealing performance of the alkali liquor cooler is effectively improved, the equipment structure is more stable, and the service efficiency and the service life of the alkali liquor cooler can be effectively prolonged.
From the test results of examples 1 to 3, when the plating position, the plating layer thickness, the type of the electroless plating solution, the heat treatment step, the plating method and the plating process parameters are all within the limits of the present disclosure, a preferable film layer structure can be obtained, so that the product prepared by the present disclosure has excellent corrosion resistance, long-term operation under the strong corrosion environment of alkali solution and acid solution can be realized, and the service efficiency and the service life of the alkali solution cooler can be effectively prolonged.
As is apparent from the test results of comparative example 1, since the shell side portion of the U-tube heat exchanger provided in comparative example 1 and the bent tube section and part of the straight tube section of the U-tube heat exchanger have no coating layer, the corrosion performance of the U-tube heat exchanger is poor, and after the U-tube heat exchanger provided in comparative example 1 is applied to the lye cooler for 12 months, a small number of leakage points appear in the equipment, and after 36 months and 60 months of operation, a large number of leakage points appear in the equipment, and the sealing performance of the lye cooler under long-time operation is significantly inferior to that of example 1.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. The U-shaped tube heat exchanger is characterized by comprising a cylinder body, a tube plate (2) and U-shaped heat exchange tubes (3); the cylinder body comprises a sealing head part (1) and a shell side part (4) with a coating film;
The U-shaped heat exchange tube (3) comprises a coating part, and a first coating layer is coated on the surface of the coating part; the coating part comprises a bent pipe section (31) of the U-shaped heat exchange pipe, and a first straight pipe section (32) and a second straight pipe section (33) which are connected with two ends of the bent pipe section.
2. The U-tube heat exchanger of claim 1, wherein the first coating layer has a thickness of 30-100 μm, and the first coating layer is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer, or a tin layer.
3. A U-tube heat exchanger according to claim 1, wherein the first straight tube section (32) and the second straight tube section (33) are of the same length; the length of the first straight pipe section (32) is 150mm or more.
4. A U-tube heat exchanger according to claim 1, wherein the bend section (31) has a bend radius of 40mm or more.
5. The U-tube heat exchanger according to claim 1, wherein the U-tube heat exchanger tube (3) has an outer diameter of 19mm or more and a wall thickness of 2mm or more; the U-shaped heat exchange tube (3) is one of an alloy steel tube, a carbon steel tube or a stainless steel tube.
6. A U-tube heat exchanger according to claim 1, wherein the inner and/or outer surface of the shell side portion (4) is covered with a second coating layer.
7. The U-tube heat exchanger of claim 6, wherein the second coating layer has a thickness of 30-100 μm, and the second coating layer is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer, or a tin layer.
8. A U-tube heat exchanger according to claim 1, wherein the tube sheet (2) divides the inner cavity of the cylinder into a first chamber (5) and a second chamber (6);
The first chamber (5) is provided with a first inlet (11) and a first outlet (12), the U-shaped heat exchange tube (3) is arranged in the second chamber (6), the U-shaped heat exchange tube (3) is fixedly connected to the tube plate (2), and the tube pass of the U-shaped heat exchange tube (3) is communicated with the first chamber (5); the second chamber (6) has a second inlet (13) and a second outlet (14);
the cylinder body is selected from one of an alloy steel cylinder body, a carbon steel cylinder body, a stainless steel cylinder body or a copper alloy cylinder body.
9. A U-tube heat exchanger according to claim 1, wherein the cylinder further comprises a shell side flange (7), the surface of the shell side flange (7) being coated with a third coating; the thickness of the third coating layer is 30-100 mu m, and the third coating layer is a nickel layer, a chromium layer, a copper layer, a cobalt layer, a zinc layer or a tin layer.
10. An lye cooler comprising a U-tube heat exchanger according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322640564.9U CN221055586U (en) | 2023-09-26 | 2023-09-26 | U-shaped tube heat exchanger and alkali liquor cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322640564.9U CN221055586U (en) | 2023-09-26 | 2023-09-26 | U-shaped tube heat exchanger and alkali liquor cooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221055586U true CN221055586U (en) | 2024-05-31 |
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ID=91201436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322640564.9U Active CN221055586U (en) | 2023-09-26 | 2023-09-26 | U-shaped tube heat exchanger and alkali liquor cooler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221055586U (en) |
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2023
- 2023-09-26 CN CN202322640564.9U patent/CN221055586U/en active Active
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