CN109764698B - Liquid nitrogen refrigerant heat exchanger and use method thereof - Google Patents
Liquid nitrogen refrigerant heat exchanger and use method thereof Download PDFInfo
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- CN109764698B CN109764698B CN201910145478.6A CN201910145478A CN109764698B CN 109764698 B CN109764698 B CN 109764698B CN 201910145478 A CN201910145478 A CN 201910145478A CN 109764698 B CN109764698 B CN 109764698B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 239000007788 liquid Substances 0.000 title claims abstract description 89
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 69
- 239000003507 refrigerant Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000005192 partition Methods 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000000576 coating method Methods 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 20
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 238000012986 modification Methods 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 10
- 238000005260 corrosion Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- 239000010963 304 stainless steel Substances 0.000 claims description 6
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 5
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-M hexadecanoate Chemical compound CCCCCCCCCCCCCCCC([O-])=O IPCSVZSSVZVIGE-UHFFFAOYSA-M 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 230000004907 flux Effects 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 239000002826 coolant Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000010257 thawing Methods 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- FLPJVCMIKUWSDR-UHFFFAOYSA-N 2-(4-formylphenoxy)acetamide Chemical compound NC(=O)COC1=CC=C(C=O)C=C1 FLPJVCMIKUWSDR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229940074979 cetyl palmitate Drugs 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- PXDJXZJSCPSGGI-UHFFFAOYSA-N hexadecanoic acid hexadecyl ester Natural products CCCCCCCCCCCCCCCCOC(=O)CCCCCCCCCCCCCCC PXDJXZJSCPSGGI-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Abstract
The invention relates to the technical field of heat exchangers and discloses a liquid nitrogen refrigerant heat exchanger and a use method thereof, wherein the liquid nitrogen refrigerant heat exchanger comprises a shell and a supporting partition plate, the supporting partition plate divides the interior of the shell into an inner cavity and an air inlet channel, and the lower end of the inner cavity is communicated with the lower end of the air inlet channel; the shell is internally provided with a heat exchange tube positioned in the inner cavity, and the supporting partition plate is provided with a through hole for the heat exchange tube to pass through; the liquid nitrogen refrigerant heat exchanger also comprises a tail gas inlet, a tail gas outlet and a liquid outlet. The invention has the following advantages and effects: the fin tube is used, the heat exchange area is large, the heat exchange coefficient is high, and the heat exchange tube is suitable for gas heat exchange. The heat exchange tube can be a single tube or can be stacked after multiple tubes are connected, so that liquid nitrogen in the tube is conveniently distributed, and heat exchange is facilitated. The first baffle plate and the second baffle plate are arranged in the inner cavity, so that the turbulence of gas is enhanced, and the heat exchange effect is improved. The liquid nitrogen inlet and the nitrogen outlet of the heat exchange tube are positioned on the same side of the shell, the heat exchange tube and the supporting partition plate are not welded and fixed, the contact points with the shell are few, the stress conflict is reduced, and the heat exchange tube has the advantages of high flux, quick heat exchange, small stress, flexible layout, difficult blockage and the like.
Description
Technical Field
The invention belongs to the technical field of heat exchangers, and particularly relates to a liquid nitrogen refrigerant heat exchanger and a use method thereof.
Technical Field
The low-boiling point and low-melting point solvents such as methanol, methylene dichloride and low-carbon hydrocarbons contained in the noncondensable gas are small, and the solvents are recovered by condensation. Liquid nitrogen is liquid nitrogen, the temperature of the liquid nitrogen is-196 ℃ under normal pressure, a large amount of heat is absorbed during vaporization, and when the liquid nitrogen is used as a cooling medium, the temperature can be reduced to below-100 ℃, so that the liquid nitrogen is an ideal cooling medium.
The Chinese patent application with publication number of CN107940574A discloses a liquid nitrogen cooling and dehumidifying device, which comprises a heat exchanger, wherein the heat exchanger comprises a liquid nitrogen heat exchange tube, a liquid collecting chamber and a liquid nitrogen liquid inlet tube, and the liquid nitrogen heat exchange tube is vertically arranged. The vertical pipeline has poor self-contraction capability under the low-temperature working condition, and the generated stress easily causes the heat exchange pipe to be separated from other parts, thereby causing equipment failure and affecting the normal operation of the equipment.
Disclosure of Invention
The invention aims to provide a liquid nitrogen refrigerant heat exchanger which has the effects of quick heat exchange and small stress.
The technical aim of the invention is realized by the following technical scheme: the liquid nitrogen refrigerant heat exchanger comprises a shell and a supporting partition plate arranged in the shell, wherein the supporting partition plate divides the interior of the shell into an inner cavity and an air inlet channel, and the lower end of the inner cavity is communicated with the lower end of the air inlet channel; the shell is internally provided with a heat exchange tube positioned in the inner cavity, and the support baffle plate is provided with a through hole for the heat exchange tube to pass through; the liquid nitrogen refrigerant heat exchanger further comprises a tail gas inlet communicated with the air inlet channel, a tail gas outlet communicated with the upper end of the inner cavity and a liquid outlet arranged on the shell.
Through adopting above-mentioned technical scheme, the inside internal chamber and the inlet channel of being separated into by the support baffle of casing of liquid nitrogen refrigerant heat exchanger, by the coolant entering into the inlet channel from the tail gas import to flow down along the inlet channel, enter into the inner chamber, and contact the heat exchange tube, liquid nitrogen flows in from the liquid nitrogen import of heat exchange tube, flows out from the nitrogen outlet after passing through the heat exchange tube, is condensed into liquid by the low boiling point low-melting point material in the coolant and gathers downwards by the heat exchange tube and is discharged from the leakage fluid dram.
The heat exchange tubes can be horizontally arranged by adopting a single tube or multiple tubes which are connected in parallel and are arranged in a cascade way, so that liquid nitrogen distribution in the tubes is facilitated; the radiating pipe passes through the through hole on the supporting partition board and is not welded and fixed with the supporting partition board, so that no internal stress conflict exists between the heat exchange pipe and the supporting partition board, and the effects of fast heat exchange and small stress are achieved
The invention is further provided with: one end of the heat exchange tube is a liquid nitrogen inlet, the other end of the heat exchange tube is a nitrogen outlet, and the liquid nitrogen inlet and the nitrogen outlet are positioned on the same side of the shell.
By adopting the technical scheme, the contact points between the heat exchange tube and the shell are few, the inside is only contacted with the supporting partition plate, and the internal stress conflict between the heat exchange tube and other parts is reduced.
The invention is further provided with: the inner wall of the shell is provided with a first baffle plate, and the supporting baffle plate is provided with a second baffle plate.
By adopting the technical scheme, the first baffle plate is arranged on the inner wall of the shell, the second baffle plate is arranged on the supporting baffle plate, the turbulence of the gas is enhanced, and the heat exchange effect is improved.
The invention is further provided with: the upper end of the supporting partition plate is arranged on the inner wall of the shell in a sliding mode along the horizontal direction.
Through adopting above-mentioned technical scheme, adjust the slip of support baffle at the casing, can adjust the clearance of inner chamber space and baffling board two and shells inner wall, and then can adjust the residence time of being cooled medium in the inner chamber as required, improve the heat transfer effect.
The invention is further provided with: the support baffle is provided with a mounting hole for the second baffle to pass through, the support baffle is provided with an adjusting piece and a positioning rod arranged on the adjusting piece in a sliding manner along the vertical direction, and the second baffle is provided with a plurality of positioning holes for the positioning rod to be inserted.
By adopting the technical scheme, after the adjusting piece is adjusted to rise to drive the positioning rod to be separated from the positioning hole, the clearance between the baffle plate II and the inner wall of the shell is adjusted, and the retention time of the cooled medium in the inner cavity can be adjusted according to the requirement.
The invention is further provided with: an inclined bottom plate is arranged in the shell and used for guiding condensed liquid to the liquid outlet.
The invention is further provided with: a heating pipe is arranged in the shell, one end of the heating pipe is a hot water inlet, and the other end of the heating pipe is a hot water outlet.
By adopting the technical scheme, the heating pipe is arranged in the shell and is used for defrosting periodically.
The invention is further provided with: the heat exchange tube is a fin tube, the side wall of the shell is provided with a sight glass, and the upper end of the shell is provided with a standby port.
Through adopting above-mentioned technical scheme, the finned tube heat transfer area is big, and heat transfer coefficient is high, is fit for gaseous heat transfer, installs the sight glass on the casing to look over the inside frosting situation of casing when operating.
The invention is further provided with: the heat exchange tube and the shell are made of 304 stainless steel, a coating is arranged on the outer wall of the heat exchange tube, and the coating is prepared by the following steps of firstly, polishing the surface of the heat exchange tube; step two, chemical corrosion, namely placing the polished heat exchange tube into a 40wt% HF solution to be corroded for 30min, wherein the HF solution is kept at a temperature of 30-35 ℃; preparing a modification liquid, namely uniformly mixing 40 parts of ethanol, 15-25 parts of PVM/MA copolymer butyl ester, 5-15 parts of cetostearyl palmitate and 7-10 parts of carboxymethyl cellulose according to parts by weight to obtain the modification liquid; step four, cleaning and drying, namely cleaning the heat exchange tube subjected to chemical corrosion by deionized water and absolute ethyl alcohol, and drying by dry air after cleaning; fifthly, modifying, namely placing the heat exchange tube in a modifying liquid, adjusting the temperature to 35-40 ℃, and soaking for 2 hours at constant temperature; step six, drying, namely placing the modified heat exchange tube into an oven for drying, and heating to 120 ℃ for constant-temperature drying for 2 hours, so that a coating is formed on the outer wall of the heat exchange tube.
By adopting the technical scheme, in the operation process, the water in the cooled medium can be condensed into water, and when the condensed water is frozen on the outer wall of the heat exchange tube, the heat exchange effect can be influenced. In order to realize ice coating prevention on the surface of the heat exchange tube, an ice coating prevention layer is formed on the outer wall of the heat exchange tube, firstly, the heat exchange tube is polished and then corroded by HF solution, an oxide film on the surface of the heat exchange tube is removed, then a modification solution is prepared, the heat exchange tube is modified by the modification solution and then dried, and the PVM/MA copolymer butyl ester, cetylpalmitate and carboxymethyl cellulose mixture is coated on the surface of the heat exchange tube, so that the hydrophobicity of the surface of the heat exchange tube can be improved, the rolling angle is reduced, the contact angle is improved, the phase change of water can be inhibited, the ice adhesion is small, the ice coating prevention capability of the heat exchange tube is greatly improved, and the icing of the surface of the heat exchange tube when a liquid nitrogen refrigerant heat exchanger runs is reduced.
The invention also aims to provide a use method of the liquid nitrogen refrigerant heat exchanger, which is characterized in that liquid nitrogen is introduced from a liquid nitrogen inlet until the liquid nitrogen flows out from a nitrogen outlet, a cooled medium is introduced from a tail gas inlet until low-boiling-point substances in the cooled medium are condensed into liquid state and then collected on a bottom plate, and the liquid nitrogen flows into a liquid outlet along the bottom plate.
The beneficial effects of the invention are as follows:
1. the heat exchange tube uses fin tubes, has large heat exchange area and high heat exchange coefficient, and is suitable for gas heat exchange.
2. The heat exchange tube can be a single tube or can be arranged in a laminated way after multiple tubes are connected, the design is flexible according to requirements, the heat exchange tube is horizontally placed and is laminated and moved, liquid nitrogen distribution in the tube is facilitated, and heat exchange is facilitated.
3. The shell adopts square design, and convenient heat exchange tube arranges and cold and hot stress release.
4. And the first baffle plate and the second baffle plate are arranged, so that the turbulence of the gas is enhanced, and the heat exchange effect is improved.
5. The liquid nitrogen inlet and the nitrogen outlet of the heat exchange tube are positioned on the same side of the shell, the heat exchange tube and the supporting partition plate are not welded and fixed, the contact points with the shell are less, and no internal stress conflict exists between the heat exchange tube and the supporting partition plate.
6. The bottom of the shell is provided with a heating pipe for defrosting periodically;
7. the cooled medium circulates in the shell, only the tail gas inlet and the tail gas outlet are arranged, the inside is not provided with a sealing structure, and no leakage point exists.
8. A sight glass is arranged on the side wall of the shell so as to check internal frosting during operation.
9. The shell and the heat exchange tube are made of 304 stainless steel.
10. The liquid nitrogen refrigerant heat exchanger has the advantages of large flux, quick heat exchange, small stress, flexible layout, difficult blockage and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of embodiment 1.
Fig. 2 is a schematic view of the structure of the supporting spacer of embodiment 1.
FIG. 3 is a schematic diagram showing the connection between the second baffle plate and the second baffle plate in example 1.
Fig. 4 is a schematic view of the structure of the heating pipe of example 1.
In the figure, 1, a shell; 11. an inner cavity; 12. an air intake passage; 13. a tail gas inlet; 14. a tail gas outlet; 15. a liquid outlet; 16. a standby port; 17. a first baffle plate; 2. a supporting partition; 21. a through hole; 22. a baffle II; 221. positioning holes; 23. a mounting port; 24. an adjusting member; 25. a positioning rod; 3. a heat exchange tube; 31. a liquid nitrogen inlet; 32. a nitrogen outlet; 4. a bottom plate; 5. heating pipes; 51. a hot water inlet; 52. a hot water outlet; 53. u-shaped anchor ear; 6. a thermometer port; 7. a viewing mirror.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1: the liquid nitrogen refrigerant heat exchanger comprises a shell 1 and a supporting partition plate 2 positioned in the shell 1, wherein the shell 1 comprises a lower plate, side plates fixed on the periphery of the lower plate and a top plate fixed on the side plates, and the lower plate and the side plates are square in shape. The supporting partition plate 2 divides the interior of the shell 1 into an inner cavity 11 and an air inlet channel 12, and the lower end of the inner cavity 11 is communicated with the lower end of the air inlet channel 12. The heat exchange tube 3 is arranged in the shell 1, the heat exchange tube 3 is a fin tube, and the heat exchange tube 3 is horizontally arranged and positioned in the inner cavity 11. One end of the heat exchange tube 3 is a liquid nitrogen inlet 31, the other end is a nitrogen outlet 32, a plurality of through holes 21 are formed in the supporting partition plate 2, the heat exchange tube 3 is arranged in a multi-layer and laminated mode, and the through holes 21 are used for the heat exchange tube 3 to pass through.
As shown in fig. 1, the housing 1 is further provided with a tail gas inlet 13 communicating with the air inlet channel 12, and a tail gas outlet 14 communicating with the upper end of the inner cavity 11, wherein a cooled medium enters the air inlet channel 12 from the tail gas inlet 13, enters the inner cavity 11 from the air inlet channel 12, passes through the inner cavity 11, exchanges heat with the heat exchange tube 3, is discharged from the tail gas outlet 14, and is condensed by low-boiling-point low-melting-point substances in the cooled medium and then is collected downwards. The bottom in the shell 1 is also provided with an inclined bottom plate 4, the side wall of the lower end of the shell 1 is provided with a liquid outlet 15, condensed liquid is collected on the bottom plate 4 and flows to the liquid outlet 15 along the bottom plate 4 to be discharged. The upper end of the shell 1 is also provided with a standby port 16 communicated with the inner cavity 11, and the side wall of the shell 1 is provided with a thermometer port 6 for installing a thermometer.
As shown in fig. 1, a first baffle plate 17 is arranged on the inner wall of the shell 1, a second baffle plate 22 is arranged on the supporting baffle plate 2, and the first baffle plate 17 and the second baffle plate 22 are both positioned in the inner cavity 11 and horizontally arranged. The first baffle plate 17 and the second baffle plate 22 are positioned between the layers of the heat exchange tube 3 and are used for enhancing turbulence of the cooled medium and increasing heat exchange effect.
As shown in fig. 1 and 3, two horizontal T-shaped grooves are formed in the inner wall of the upper end of the casing 1, two T-shaped groove bolts are connected to the upper end of the supporting partition plate 2 in a threaded manner, the heads of the T-shaped groove bolts are embedded into the T-shaped grooves, the supporting partition plate 2 can slide relative to the casing 1, a mounting opening 23 is formed in the supporting partition plate 2, and the second baffle plate 22 penetrates through the mounting opening 23. The second baffle 22 is provided with a plurality of positioning holes 221, and the plurality of positioning holes 221 are distributed along the length direction of the baffle. The supporting partition plate 2 is provided with an adjusting member 24 in a sliding manner along the vertical direction, a positioning rod 25 is fixed on the adjusting member 24, and the positioning rod 25 is inserted into the positioning hole 221. When the supporting partition plate 2 is adjusted to move, the size of the inner cavity 11 and the gap between the baffle plate II 22 and the inner wall of the shell 1 can be adjusted, the retention time of the cooled medium in the inner cavity 11 can be adjusted according to the requirement, when the adjusting piece 24 is pulled to drive the positioning rod 25 to be separated from the positioning hole 221, the baffle plate II 22 can be adjusted to move so as to adjust the gap between the baffle plate II 22 and the inner wall of the shell 1, the retention time of the cooled medium in the inner cavity 11 can also be adjusted, the adjusting piece 24 is pushed downwards to drive the positioning rod 25 to be inserted into the positioning hole 221, and the position of the baffle plate II 22 is fixed.
As shown in fig. 3 and 4, a sight glass 7 is also mounted on the side wall of the housing 1 to observe the frosting condition in the housing 1. The shell 1 is also internally provided with a heating pipe 5 positioned below the heat exchange pipe 3, the middle part of the heating pipe 5 is positioned below the heat exchange pipe 3, two ends respectively penetrate out of the shell 1, one end is provided with a hot water inlet 51, the other end is provided with a hot water outlet 52, and the heating pipe 5 is used for defrosting. The middle part of the heating pipe 5 is hung on the supporting partition plate 2 through a U-shaped hoop 53.
The shell 1 and the heat exchange tube 3 are made of 304 stainless steel. The outer wall of the heat exchange tube 3 is also provided with a coating layer which is used for placing ice. The preparation method of the coating comprises the following steps of firstly, polishing the surface of the heat exchange tube 3; step two, chemical corrosion, namely placing the polished heat exchange tube 3 in an HF solution with the weight percent of 40 to corrode for 30min, and keeping the temperature of the HF solution at 30 ℃; preparing a modification liquid, namely uniformly mixing 40 parts of ethanol, 15 parts of PVM/MA copolymer butyl ester, 5 parts of cetostearyl palmitate and 7 parts of carboxymethyl cellulose according to parts by weight to obtain the modification liquid; step four, cleaning and drying, namely cleaning the heat exchange tube 3 subjected to chemical corrosion by deionized water and absolute ethyl alcohol, and drying by dry air after cleaning; fifthly, modifying, namely placing the heat exchange tube 3 in a modifying liquid, adjusting the temperature to 35 ℃, and soaking for 2 hours at constant temperature; step six, drying, namely placing the modified heat exchange tube 3 into an oven for drying, and heating to 120 ℃ for constant temperature drying for 2 hours, so that a coating is formed on the outer wall of the heat exchange tube 3.
The using method of the liquid nitrogen refrigerant heat exchanger comprises the following steps: liquid nitrogen is introduced from the liquid nitrogen inlet 31 until the liquid nitrogen flows out from the nitrogen outlet 32, and a cooled medium is introduced from the tail gas inlet 13 until low-boiling-point substances in the cooled medium are condensed into a liquid state and then collected on the bottom plate 4, and flows into the liquid discharge port 15 along the bottom plate 4.
Example 2: the liquid nitrogen refrigerant heat exchanger is different from the embodiment 1 in that the preparation method of the coating is as follows, step one, the surface of the heat exchange tube is polished; step two, chemical corrosion, namely placing the polished heat exchange tube into an HF solution with the weight percent of 40 to be corroded for 30min, wherein the temperature of the HF solution is kept at 35 ℃; preparing a modification liquid, namely uniformly mixing 40 parts of ethanol, 25 parts of PVM/MA copolymer butyl ester, 15 parts of cetostearyl palmitate and 10 parts of carboxymethyl cellulose according to parts by weight to obtain the modification liquid; step four, cleaning and drying, namely cleaning the heat exchange tube subjected to chemical corrosion by deionized water and absolute ethyl alcohol, and drying by dry air after cleaning; fifthly, modifying, namely placing the heat exchange tube in modifying liquid, adjusting the temperature to 40 ℃, and soaking for 2 hours at constant temperature; step six, drying, namely placing the modified heat exchange tube into an oven for drying, and heating to 120 ℃ for constant-temperature drying for 2 hours, so that a coating is formed on the outer wall of the heat exchange tube.
Coating performance test: 3 pieces of 304 stainless steel sheets were taken, 1 piece of the coating-containing stainless steel sheet was prepared by the coating preparation method in reference example 1, 1 piece of the coating-containing stainless steel sheet was prepared by the coating preparation method in reference example 2 weeks, and 1 piece was used as a control group.
The contact angle test was performed by measuring 3 different points on the surface of each stainless steel sheet with a contact angle meter and taking the average of the measured values, 5ml of deionized water was used as the measuring droplet, and 3 test results are shown in table 1.
Dynamic icing experiment: taking the 3 stainless steel sheets, placing the stainless steel sheets in a refrigerator with the temperature of minus 5 ℃ and the inclination angle of 30 ℃, taking an infusion bag, injecting deionized water, installing an infusion tube, adjusting the dropping speed of the water drops to be 2 drops/second, dropping the water drops on the stainless steel sheets, observing the icing condition on the 3 stainless steel sheets after 20 minutes, and listing the results in a table 1
TABLE 1 coating Performance test results
As can be seen from the data in Table 1, the coatings of example 1 and example 2 both greatly improved the hydrophobic and anti-icing properties of the 304 stainless steel.
Claims (7)
1. The liquid nitrogen refrigerant heat exchanger is characterized in that: the device comprises a shell (1) and a supporting partition board (2) arranged in the shell (1), wherein the supporting partition board (2) divides the interior of the shell (1) into an inner cavity (11) and an air inlet channel (12), and the lower end of the inner cavity (11) is communicated with the lower end of the air inlet channel (12); a heat exchange tube (3) positioned in the inner cavity (11) is arranged in the shell (1), and a through hole (21) for the heat exchange tube (3) to pass through is formed in the supporting partition plate (2); the liquid nitrogen refrigerant heat exchanger further comprises a tail gas inlet (13) communicated with the air inlet channel (12), a tail gas outlet (14) communicated with the upper end of the inner cavity (11), and a liquid outlet (15) arranged on the shell (1);
the inner wall of the shell (1) is provided with a first baffle plate (17), and the supporting baffle plate (2) is provided with a second baffle plate (22);
the upper end of the supporting partition plate (2) is arranged on the inner wall of the shell (1) in a sliding manner along the horizontal direction;
the heat exchange tube (3) and the shell (1) are made of 304 stainless steel, a coating is arranged on the outer wall of the heat exchange tube (3), and the preparation method of the coating comprises the following steps of firstly, polishing the surface of the heat exchange tube (3); step two, chemical corrosion, namely placing the polished heat exchange tube (3) in an HF solution with the weight percent of 40 to corrode for 30min, and keeping the temperature of the HF solution at 30-35 ℃; preparing a modification liquid, namely uniformly mixing 40 parts of ethanol, 15-25 parts of PVM/MA copolymer butyl ester, 5-15 parts of cetostearyl palmitate and 7-10 parts of carboxymethyl cellulose according to parts by weight to obtain the modification liquid; step four, cleaning and drying, namely cleaning the heat exchange tube (3) subjected to chemical corrosion by deionized water and absolute ethyl alcohol, and drying by dry air after cleaning; fifthly, modifying, namely placing the heat exchange tube (3) in modifying liquid, adjusting the temperature to 35-40 ℃, and soaking for 2 hours at constant temperature; step six, drying, namely placing the modified heat exchange tube (3) into an oven for drying, and heating to 120 ℃ for constant temperature drying for 2 hours, so that a coating is formed on the outer wall of the heat exchange tube (3).
2. The liquid nitrogen refrigerant heat exchanger of claim 1, wherein: one end of the heat exchange tube (3) is a liquid nitrogen inlet (31) and the other end of the heat exchange tube is a nitrogen outlet (32), and the liquid nitrogen inlet (31) and the nitrogen outlet (32) are positioned on the same side of the shell (1).
3. The liquid nitrogen refrigerant heat exchanger of claim 1, wherein: the support baffle plate (2) is provided with a mounting opening (23) through which the baffle plate II (22) passes, the support baffle plate (2) is provided with an adjusting piece (24) in a sliding manner along the vertical direction, a positioning rod (25) arranged on the adjusting piece (24), and the baffle plate II (22) is provided with a plurality of positioning holes (221) for the positioning rod (25) to be inserted.
4. The liquid nitrogen refrigerant heat exchanger of claim 1, wherein: an inclined bottom plate (4) is arranged in the shell (1), and the bottom plate (4) is used for guiding condensed liquid to a liquid outlet (15).
5. The liquid nitrogen refrigerant heat exchanger of claim 1, wherein: a heating pipe (5) is arranged in the shell (1), one end of the heating pipe (5) is a hot water inlet (51) and the other end of the heating pipe is a hot water outlet (52).
6. The liquid nitrogen refrigerant heat exchanger of claim 1, wherein: the heat exchange tube (3) is a finned tube, a sight glass (7) is arranged on the side wall of the shell (1), and a standby port (16) is arranged at the upper end of the shell (1).
7. The method of using a liquid nitrogen refrigerant heat exchanger according to claim 1, wherein: liquid nitrogen is introduced from a liquid nitrogen inlet (31) until the liquid nitrogen flows out from a nitrogen outlet (32), a cooled medium is introduced from a tail gas inlet (13) until low-boiling-point substances in the cooled medium are condensed into a liquid state and then gathered on a bottom plate (4), and the liquid nitrogen flows into a liquid outlet (15) along the bottom plate (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910145478.6A CN109764698B (en) | 2019-02-27 | 2019-02-27 | Liquid nitrogen refrigerant heat exchanger and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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