CN113819669B - Low-temperature refrigeration device and method based on carbon nano tube gravity oil separation effect - Google Patents

Low-temperature refrigeration device and method based on carbon nano tube gravity oil separation effect Download PDF

Info

Publication number
CN113819669B
CN113819669B CN202111081590.1A CN202111081590A CN113819669B CN 113819669 B CN113819669 B CN 113819669B CN 202111081590 A CN202111081590 A CN 202111081590A CN 113819669 B CN113819669 B CN 113819669B
Authority
CN
China
Prior art keywords
refrigerant
boiling
carbon nano
low
evaporator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111081590.1A
Other languages
Chinese (zh)
Other versions
CN113819669A (en
Inventor
何一坚
赵恒庆
丁佳敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University ZJU
Research Institute of Zhejiang University Taizhou
Original Assignee
Zhejiang University ZJU
Research Institute of Zhejiang University Taizhou
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang University ZJU, Research Institute of Zhejiang University Taizhou filed Critical Zhejiang University ZJU
Priority to CN202111081590.1A priority Critical patent/CN113819669B/en
Publication of CN113819669A publication Critical patent/CN113819669A/en
Application granted granted Critical
Publication of CN113819669B publication Critical patent/CN113819669B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/005—Compression machines, plants or systems with non-reversible cycle of the single unit type
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/158—Carbon nanotubes
    • C01B32/168—After-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Nanotechnology (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Lubricants (AREA)

Abstract

The invention discloses a low-temperature refrigeration device and a low-temperature refrigeration method based on a carbon nano tube gravity oil separation effect, wherein the device is based on single-machine compression single-stage fractional condensation self-cascade refrigeration and comprises a compressor, a condenser, a gas-liquid separator, a capillary tube and a throttle valve; saturated liquid-phase high-temperature refrigerant in the gas-liquid separator enters a condensing evaporator through a throttling device to complete the evaporation process; meanwhile, saturated gas working refrigerant generated in the gas-liquid separator enters the condensing evaporator to finish the condensation process, enters the evaporator after being throttled by a capillary tube, and finally enters a compression cycle after low-temperature refrigerant exiting the evaporator is mixed with high-temperature refrigerant gas which finishes the evaporation process in the condensing evaporator; in the circulation process, a proper amount of carbon nano tubes are added to the refrigerant, so that the content of lubricating oil in the low-boiling-point refrigerant in the gas-liquid separator is greatly reduced, the capillary tube is prevented from being blocked by the lubricating oil, and meanwhile, the heat exchange performance of the refrigerant, the lubricating performance of the lubricating oil and the abrasion of a compressor can be improved.

Description

Low-temperature refrigeration device and method based on carbon nano tube gravity oil separation effect
Technical Field
The invention relates to the field of refrigeration equipment, in particular to a low-temperature refrigeration device and method based on a carbon nano tube gravity oil separation effect.
Background
Since the discovery in 1991, the carbon nano tube has good heat transfer performance, singular conductivity and excellent mechanical property due to the unique structural characteristics, thereby bringing about the wide attention of expert students and having wide application prospect in various fields. The carbon nano tube not only has some common characteristics of nano materials, but also has extremely high mechanical strength, and is applied to lubricating oil additives in the field of lubrication, thereby playing a role in improving and enhancing antifriction and antiwear properties. The porous structure, larger specific surface area and lighter mass density of the carbon nanotubes also make them exhibit good performance in adsorption.
In the self-cascade refrigeration system, after the refrigerants with different evaporating temperatures are condensed by a condenser, the low-temperature refrigerant is in a gaseous state, and the high-boiling-point refrigerant is condensed into a liquid state, at the moment, the two refrigerants in the two states are separated by arranging a gas-liquid separator, so that the liquid high-boiling-point refrigerant is throttled and then is continuously condensed. However, at present, when the gas-phase low-boiling-point refrigerant is separated, some lubricating oil droplets are often entrained, and seriously, the droplets enter a low-temperature pipeline, so that capillary tubes are blocked, and the running condition of the system is seriously affected.
In order to realize the efficient separation of the gas-phase low-boiling-point refrigerant and the lubricating oil in the gas-liquid separator of the low-temperature refrigeration system, the gas-liquid separator is mainly improved, but the separation effect of the technology on some emulsified oil which is mutually soluble with the refrigerant is still not obvious, so that a device and a method for efficiently separating the oil component in the gas-phase low-boiling-point refrigerant are needed.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a low-temperature refrigeration device and a low-temperature refrigeration method based on a carbon nano tube gravity oil separation effect.
In order to solve the problems, the invention adopts the following technical scheme:
a low-temperature refrigerating device based on a carbon nano tube gravity oil separation effect comprises a compressor, a condenser, a gas-liquid separator, a throttle valve, a capillary tube, a condensation evaporator, an evaporator and a filling port; wherein the outlet of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator; the high boiling point refrigerant channel of the gas-liquid separator is connected with the evaporation side channel of the condensing evaporator through a throttle valve; the low boiling point refrigerant channel of the gas-liquid separator is connected with the condensing side channel of the condensing evaporator; the outlet of the condensing side of the condensing evaporator is connected with the inlet of the evaporator through a capillary tube; the evaporation side outlet of the condensing evaporator is connected with the outlet of the evaporator and is connected with the inlet of the compressor; a filling port is arranged between the condenser and the gas-liquid separator, and is used for filling the carbon nano tube.
Further, the system also comprises a refrigerant, and the refrigerant adopts a self-cascade mixed refrigerant.
Further, the self-cascade mixed refrigerant comprises one or a combination of high-boiling-point refrigerants and one or a combination of low-boiling-point refrigerants; wherein the high boiling point refrigerants include R134A, R600A, R1234YF, R1234ZE (Z), R1234ZE (E), R142B and R22, and the low boiling point refrigerants include R23, R14, R1150, R290, R170, R125 and R32.
The low-temperature refrigeration method based on the carbon nano tube gravity oil separation effect is based on the refrigeration device, and comprises the following steps of:
step 1: stopping the compressor, and filling the carbon nanotubes with a set quantity into the refrigerating device through a filling port;
step 2: starting the compressor; mixing the carbon nano tube and the refrigerant and then entering a condenser;
step 3: condensing by a condenser to obtain a partially liquefied refrigerant; the high-boiling-point refrigerant is formed into a liquid state through exothermic condensation, and the low-boiling-point refrigerant is kept in a gaseous state; wherein, because the viscosity of the lubricating oil is high and the carbon nano tube has a phase transition mechanism, the carbon nano tube adsorbs the lubricating oil and deposits and is mixed with liquid high-boiling-point refrigerant;
step 4: the partially liquefied refrigerant enters a gas-liquid separator to carry out a separation process of a gas-phase low-boiling-point refrigerant and a high-boiling-point refrigerant; the separated high-boiling-point refrigerant enters an evaporation side channel of the condensation evaporator through a throttle valve, and the low-temperature refrigerant enters a condensation side channel of the condensation evaporator;
step 5: in the condensing evaporator, the high-boiling-point refrigerant containing lubricating oil and carbon nano tubes exchanges heat with the saturated gas-phase low-boiling-point refrigerant, so that the high-boiling-point refrigerant absorbs heat and evaporates to form steam, and the low-boiling-point refrigerant releases heat and condenses into a liquid state; the high boiling point refrigerant containing the carbon nano tubes generates a large number of bubbles due to boiling heat exchange effect, and the carbon nano tubes are resuspended in the refrigerant under the action of the bubbles generated in the boiling process, so that the carbon nano tubes are dispersed, and the condensation and evaporation effects are prevented from being deteriorated due to the deposition and agglomeration of the carbon nano tubes in the circulation process;
step 6: feeding a liquid low boiling point refrigerant into an evaporator through a capillary tube; the low boiling point refrigerant after the evaporation process is completed through the evaporator is mixed with the high boiling point refrigerant after the condensation evaporator, and then enters the compressor to carry out the next circulation process, and the step is finished.
Further, the carbon nano tube in the step 1 accounts for 0.8 to 10 weight percent of the refrigerant.
Further, the carbon nanotubes are surface modified.
Further, the surface of the carbon nanotube is grafted with functional groups similar to alkane chemical properties through covalent bond properties.
Further, the functional groups of similar alkane chemistry include C 16 TMS、C 8 TMS、C 3 TMS。
Further, the surface modification of the carbon nanotube comprises the following steps:
step 11: uniformly mixing 10-30g of carbon nano tube with 600ml of alcohol solution, and performing water bath ultrasonic treatment for 60-80 minutes to form hydroxyl on the surface of particles;
step 12: adding 5-15g C into the carbon nano tube/water suspension 16 TMS、C 8 TMS or C 3 TMS forms a covalent bond to complete the grafting of hydroxyl;
step 13: centrifuging the suspension, and cleaning the modified particles with alcohol for a set number of times;
step 14: the resulting granules were dried in a vacuum oven to remove the organic solvent.
Further, the drying temperature of the vacuum oven in the step 14 is 100-120 ℃.
The beneficial effects of the invention are as follows:
by arranging the carbon filling nano tube between the condenser and the gas-liquid separator, the characteristics of the carbon nano tube such as a porous structure, a larger specific surface area and the like are utilized to realize the adsorption of mist-like lubricating oil drops carried by the gas-phase low-boiling-point refrigerant in the gas-liquid separator in the cascade refrigeration system, the density of lubricating oil is increased, the gravity sedimentation of the lubricating oil in the gas-liquid separator and the condensation evaporator is promoted, the lubricating oil content in the low-boiling-point refrigerant is reduced, and the blocking caused by the lubricating oil entering a capillary tube along with the low-boiling-point refrigerant is avoided;
the carbon nano tube is added and circulates in the refrigerating device along with the refrigerant, wherein the carbon nano tube plays a role in lubricating the operation of the compressor after entering the compressor, so that the mechanical loss of the compressor is reduced, the use amount of lubricating oil in the compressor is reduced, and the reduction of oil foam in the gas-phase low-boiling-point refrigerant is further promoted;
the heat exchange efficiency and the refrigerating capacity of the refrigerating device are improved by adding the carbon nano tube;
stopping the operation of the compressor in the process of filling the carbon nanotubes in the step 1, so that the carbon nanotubes can be conveniently filled;
through the surface modification of the carbon nano tube, the affinity of the carbon nano tube and the lubricating oil of mineral oil components is improved, the aim of absorbing the lubricating oil is better realized, meanwhile, the agglomeration of carbon nano tube particles in the lubricating oil is reduced, the deposition proportion of the particles is reduced, and the aim of improving the migration of an oil phase is achieved.
Drawings
Fig. 1 is a block diagram of a first embodiment of the present invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Embodiment one:
as shown in fig. 1, a cryogenic refrigeration device based on carbon nanotube gravitational oil separation effect comprises a compressor, a condenser, a gas-liquid separator, a throttle valve, a capillary tube, a condensation evaporator, an evaporator and a filling port; wherein the outlet of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator; the high boiling point refrigerant channel of the gas-liquid separator is connected with the evaporation side channel of the condensing evaporator through a throttle valve; the low boiling point refrigerant channel of the gas-liquid separator is connected with the condensing side channel of the condensing evaporator; the outlet of the condensing side of the condensing evaporator is connected with the inlet of the evaporator through a capillary tube; the evaporation side outlet of the condensing evaporator is connected with the outlet of the evaporator and is connected with the inlet of the compressor; a filling port is provided between the condenser and the gas-liquid separator, and the filling port is used for filling the carbon nanotubes, and it should be noted that in some other embodiments, the filling port may be directly provided on the condenser or provided between other devices. The refrigerant in the refrigeration device is the existing self-cascade mixed refrigerant, the self-cascade mixed refrigerant comprises one or a combination of high-boiling-point refrigerants and one or a combination of low-boiling-point refrigerants, wherein the high-boiling-point refrigerants comprise R134A, R A, R1234YF, R1234ZE (Z), R1234ZE (E), R142B, R and the like, and the low-boiling-point refrigerants comprise R23, R14, R1150, R290, R170, R125, R32 and the like. The self-cascade mixed refrigerant of the binary mixed working medium type comprises R134A and R23 with the ratio of 60:40, R134A/R744 at 65:35, R600A/R744 at 65:35, and R170/R600A at 8:92, performing proportioning combination; the ternary mixed working medium comprises R290, R600A and R123 in a proportion of 50:10:40, R23, R143A and R134A are mixed according to a proportion of 10:70:20, proportioning and combining; the quaternary mixed working medium comprises R23, R125, R134A and R32 and 10:45:40:5, proportioning and combining. In the example, the refrigerant mixed by R744 and R134A is adopted, and the proportion is 35:65.
the filling port is used for filling the carbon nano tube, and the carbon nano tube is used for adsorbing mist-like oil drops in the gas-phase low-boiling-point refrigerant separated by the gas-liquid separator. The carbon nanotubes circulate in the refrigeration device following the refrigerant.
In the implementation process, a filling port for filling the carbon nano tube is arranged between the condenser and the gas-liquid separator, and the characteristics of a porous structure, a larger specific surface area and the like of the carbon nano tube are utilized to realize the adsorption of mist-like lubricating oil drops carried by a gas-phase low-boiling-point refrigerant in the gas-liquid separator in the cascade refrigeration system, so that the density of lubricating oil is increased, the gravity sedimentation of the lubricating oil in the gas-liquid separator and the condensing evaporator is promoted, and the blocking caused by the fact that the lubricating oil follows the low-boiling-point refrigerant to enter a capillary tube is avoided; the carbon nano tube is added and circulates in the refrigerating device along with the refrigerant, wherein the carbon nano tube plays a role in lubricating the operation of the compressor after entering the compressor, so that the mechanical loss of the compressor is reduced, the use amount of lubricating oil in the compressor is reduced, and the reduction of oil foam in the low-boiling-point refrigerant is further promoted; the heat exchange efficiency and the refrigerating capacity of the refrigerating device are improved by adding the carbon nano tube.
A low-temperature refrigeration method based on a carbon nano tube gravity oil separation effect comprises the following steps:
step 1: stopping the compressor, and filling the carbon nanotubes with a set quantity into the refrigerating device through a filling port;
step 2: starting the compressor; mixing the carbon nano tube and the refrigerant and then entering a condenser;
step 3: condensing by a condenser to obtain a partially liquefied refrigerant; the condensing effect of the condenser is that the high-boiling-point refrigerant releases heat to form a liquid state, and the low-boiling-point refrigerant keeps in a gaseous state;
step 4: the partially liquefied refrigerant enters a gas-liquid separator to carry out a separation process of a gas-phase low-boiling-point refrigerant and a high-boiling-point refrigerant; the separated high-boiling-point refrigerant enters an evaporation side channel of the condensation evaporator through a throttle valve, and the low-temperature refrigerant enters a condensation side channel of the condensation evaporator;
step 5: in the condensing evaporator, the high-boiling-point refrigerant containing lubricating oil and carbon nano tubes exchanges heat with the saturated gas-phase low-boiling-point refrigerant, so that the high-boiling-point refrigerant absorbs heat and evaporates to form steam, and the low-boiling-point refrigerant releases heat and condenses into a liquid state;
step 6: feeding a liquid low boiling point refrigerant into an evaporator through a capillary tube; the low boiling point refrigerant after the evaporation process is completed through the evaporator is mixed with the high boiling point refrigerant after the condensation evaporator, and then enters the compressor to carry out the next circulation process, and the step is ended; wherein the high boiling point refrigerant contains lubricating oil and carbon nano tubes.
The carbon nano tube with the quantity set in the step 1 accounts for 0.8-10wt% of the refrigerant. In this example the carbon nanotubes are surface modified; grafting functional groups similar to alkane chemical property on the surface of the carbon nano tube through covalent bond property, wherein the functional groups comprise C 16 TMS、C 8 TMS、C 3 TMS, the modification of the carbon nano tube is realized. Through the surface modified carbon nano tube, the affinity of the lubricating oil with mineral oil components is improved, the aim of absorbing the lubricating oil is better realized, meanwhile, the agglomeration of carbon nano tube particles in the lubricating oil is reduced, the deposition proportion of the particles is reduced, and the aim of improving the migration of an oil phase is achieved. The surface modification of the carbon nanotubes is obtained by the following steps, C 16 TMS is an example:
step 11: uniformly mixing 20g of carbon nano tube with 600ml of alcohol solution, and performing water bath ultrasonic treatment for 60-80 minutes to form hydroxyl on the surface of particles;
step 12: adding 10g of C to the carbon nanotube/water suspension 16 TMS forms a covalent bond to complete the grafting of hydroxyl;
step 13: centrifuging the suspension and washing the modified particles with alcohol several times;
step 14: the resulting pellets were dried in a vacuum oven for 3 hours to remove the organic solvent.
The drying temperature of the vacuum oven in the step 14 is 100-120 ℃, preferably 110 ℃.
In the step 3, because the viscosity of the lubricating oil is high and the carbon nanotubes have a phase-to-phase migration mechanism, compared with the refrigerant, the carbon nanotubes are easier to combine with the lubricating oil, and after the lubricating oil is adsorbed, the weight increase is deposited, so that the carbon nanotubes and the lubricating oil are more in the liquid high-boiling-point refrigerant;
in the step 5, the high boiling point refrigerant containing the carbon nanotubes generates a large amount of bubbles due to the boiling heat exchange effect, and the carbon nanotubes are resuspended in the refrigerant under the action of the bubbles generated in the boiling process, so that the carbon nanotubes are dispersed, the condensation and evaporation effects are prevented from being deteriorated due to the deposition and agglomeration of the carbon nanotubes in the circulation process, and the long-time efficient operation of the device is facilitated.
In the implementation process, the compressor is stopped in the process of filling the carbon nanotubes in the step 1, so that the carbon nanotubes can be conveniently filled; through the surface modification of the carbon nano tube, the affinity of the carbon nano tube and the lubricating oil of mineral oil components is improved, the aim of absorbing the lubricating oil is better realized, meanwhile, the agglomeration of carbon nano tube particles in the lubricating oil is reduced, the deposition proportion of the particles is reduced, and the aim of improving the migration of an oil phase is achieved.
Embodiment two:
this embodiment is an improvement based on the first embodiment, wherein the modification process of the carbon nanotubes comprises the following steps:
step 21: adding methyl methacrylate into a three-necked bottle containing methanol and carbon nano tubes; wherein the mass ratio of the methyl methacrylate to the carbon nano tube is 20:1, the ratio of the methyl methacrylate to the methanol is 1g/20ml to 1g/40ml;
step 22: carrying out ultrasonic treatment on the three-necked bottle for 10-30 min;
step 23: continuously introducing nitrogen into the three-necked bottle for 25-35 min
Step 24: adding 1g of free radical initiator into a three-necked flask, and reacting for 6-10h at 55-70 ℃; in the embodiment, the free radical initiator adopts azobisisobutyronitrile, and the free radical initiator can promote the covalent bond formation between the carbon nano tube and the methyl methacrylate, and ensure more thorough reaction;
step 25: filtering to obtain a product after reaction, and washing 3-5 times by using ethyl acetate cool ultrasonic waves;
step 26: and (3) placing the washed particles into a vacuum oven, setting the temperature to be 40-50 ℃, drying for 16-20 h, and removing the organic solvent.
The above description is only one specific example of the present invention and does not constitute any limitation on the present invention. It will be apparent to those skilled in the art that various modifications and changes in form and details may be made without departing from the principles and construction of the invention, but these modifications and changes based on the inventive concept are still within the scope of the appended claims.

Claims (5)

1. The low-temperature refrigerating device based on the carbon nano tube gravity oil separation effect is characterized by comprising a compressor, a condenser, a gas-liquid separator, a throttle valve, a capillary tube, a condensation evaporator, an evaporator and a filling port; wherein the outlet of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator;
the high boiling point refrigerant channel of the gas-liquid separator is connected with the evaporation side channel of the condensing evaporator through a throttle valve; the low boiling point refrigerant channel of the gas-liquid separator is connected with the condensing side channel of the condensing evaporator; the outlet of the condensing side of the condensing evaporator is connected with the inlet of the evaporator through a capillary tube; the evaporation side outlet of the condensing evaporator is connected with the outlet of the evaporator and is connected with the inlet of the compressor; a filling port is arranged between the condenser and the gas-liquid separator, and is used for filling the carbon nano tube; the carbon nano tube absorbs lubricating oil to enable the lubricating oil to be settled under gravity, the carbon nano tube follows a refrigerant to circulate in a refrigerating device, the refrigerating device further comprises the refrigerant, the refrigerant adopts a self-cascade mixed refrigerant, and the self-cascade mixed refrigerant comprises one or a combination of high-boiling-point refrigerants and one or a combination of low-boiling-point refrigerants; wherein the high boiling point refrigerant comprises R134A, R600A, R1234YF, R1234ZE (Z), R1234ZE, R142B and R22, the low boiling point refrigerant comprises R23, R14, R1150, R290, R170, R125 and R32, the carbon nanotubes are surface modified, the surfaces of the carbon nanotubes are grafted with functional groups similar to the chemical nature of alkanes by covalent bonds, the chemical nature of alkanes is similar to the workThe energy group includes C 16 TMS、C 8 TMS、C 3 TMS。
2. A low-temperature refrigeration method based on a carbon nano tube gravity oil separation effect, which is characterized in that the refrigeration method is based on the refrigeration device of claim 1, and comprises the following steps:
step 1: stopping the compressor, and filling the carbon nanotubes with a set quantity into the refrigerating device through a filling port;
step 2: starting the compressor; mixing the carbon nano tube and the refrigerant and then entering a condenser;
step 3: condensing by a condenser to obtain a partially liquefied refrigerant; the high-boiling-point refrigerant is formed into a liquid state through exothermic condensation, and the low-boiling-point refrigerant is kept in a gaseous state; wherein, because the viscosity of the lubricating oil is high and the carbon nano tube has a phase transition mechanism, the carbon nano tube adsorbs the lubricating oil and deposits and is mixed with liquid high-boiling-point refrigerant;
step 4: the partially liquefied refrigerant enters a gas-liquid separator to carry out a separation process of a gas-phase low-boiling-point refrigerant and a high-boiling-point refrigerant; the separated high-boiling-point refrigerant enters an evaporation side channel of the condensation evaporator through a throttle valve, and the low-temperature refrigerant enters a condensation side channel of the condensation evaporator;
step 5: in the condensing evaporator, the high-boiling-point refrigerant containing lubricating oil and carbon nano tubes exchanges heat with the saturated gas-phase low-boiling-point refrigerant, so that the high-boiling-point refrigerant absorbs heat and evaporates to form steam, and the low-boiling-point refrigerant releases heat and condenses into a liquid state; the high boiling point refrigerant containing the carbon nano tubes generates a large number of bubbles due to boiling heat exchange effect, and the carbon nano tubes are resuspended in the refrigerant under the action of the bubbles generated in the boiling process, so that the carbon nano tubes are dispersed, and the condensation and evaporation effects are prevented from being deteriorated due to the deposition and agglomeration of the carbon nano tubes in the circulation process;
step 6: feeding a liquid low boiling point refrigerant into an evaporator through a capillary tube; the low boiling point refrigerant after the evaporation process is completed through the evaporator is mixed with the high boiling point refrigerant after the condensation evaporator, and then enters the compressor to carry out the next circulation process, and the step is finished.
3. The low-temperature refrigeration method based on the gravity oil separation effect of the carbon nanotubes according to claim 2, wherein the carbon nanotubes in the step 1 are 0.8-10 wt% of the refrigerant.
4. The low-temperature refrigeration method based on the gravity oil separation effect of the carbon nanotubes according to claim 2, wherein the surface modification of the carbon nanotubes comprises the following steps:
step 11: uniformly mixing 10-30g of carbon nano tube with 600ml of alcohol solution, and performing water bath ultrasonic treatment for 60-80 minutes to form hydroxyl on the surface of particles;
step 12: adding 5-15g C into the carbon nano tube/water suspension 16 TMS、C 8 TMS or C 3 TMS forms a covalent bond to complete the grafting of hydroxyl;
step 13: centrifuging the suspension, and cleaning the modified particles with alcohol for a set number of times;
step 14: the resulting granules were dried in a vacuum oven to remove the organic solvent.
5. The method according to claim 4, wherein the drying temperature of the vacuum oven in the step 14 is 100 ℃ to 120 ℃.
CN202111081590.1A 2021-09-15 2021-09-15 Low-temperature refrigeration device and method based on carbon nano tube gravity oil separation effect Active CN113819669B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111081590.1A CN113819669B (en) 2021-09-15 2021-09-15 Low-temperature refrigeration device and method based on carbon nano tube gravity oil separation effect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111081590.1A CN113819669B (en) 2021-09-15 2021-09-15 Low-temperature refrigeration device and method based on carbon nano tube gravity oil separation effect

Publications (2)

Publication Number Publication Date
CN113819669A CN113819669A (en) 2021-12-21
CN113819669B true CN113819669B (en) 2023-05-09

Family

ID=78914713

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111081590.1A Active CN113819669B (en) 2021-09-15 2021-09-15 Low-temperature refrigeration device and method based on carbon nano tube gravity oil separation effect

Country Status (1)

Country Link
CN (1) CN113819669B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116218472A (en) * 2021-12-03 2023-06-06 青岛海尔特种电冰柜有限公司 Binary mixed refrigerant, binary mixed working medium refrigerating system and refrigerating device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8850847B2 (en) * 2009-05-04 2014-10-07 Lg Electronics Inc. Air conditioner
CN101782289B (en) * 2010-01-29 2011-06-15 武汉新世界制冷工业有限公司 High-efficiency screw-type auto-cascading refrigeration system
CN102679603A (en) * 2011-03-15 2012-09-19 河南新飞电器有限公司 Energy-saving refrigerator
CN102755764B (en) * 2012-08-01 2015-08-05 中国科学院苏州纳米技术与纳米仿生研究所 Based on oily-water seperating equipment and the method for carbon nano-tube film
CN103512257B (en) * 2013-09-27 2016-01-20 西安交通大学 For the non-azeotrope hydrocarbon mixture self-cascade refrigeration system system of two temperature refrigerator
CN109294523A (en) * 2018-10-18 2019-02-01 浙江大学山东工业技术研究院 A kind of cold accumulation air-conditioner

Also Published As

Publication number Publication date
CN113819669A (en) 2021-12-21

Similar Documents

Publication Publication Date Title
CN113819669B (en) Low-temperature refrigeration device and method based on carbon nano tube gravity oil separation effect
CN204165293U (en) Refrigerating circulatory device
Sumathy et al. Technology development in the solar adsorption refrigeration systems
Yan et al. Experimental study of the ammonia adsorption characteristics on the composite sorbent of CaCl2 and multi-walled carbon nanotubes
Aristov Novel materials for adsorptive heat pumping and storage: screening and nanotailoring of sorption properties
JP4899013B2 (en) Method for drying a gas stream comprising fluoropropene
Ugale et al. A review on working pair used in adsorption cooling system
CN103349972A (en) Magnetic nano adsorbent and preparation method thereof
CN100419345C (en) Solid adsorptive refrigerator
JP2002543366A (en) Method for improved heat and mass transport and solid-vapor sorption system
CN102203526A (en) Cooling cycle device
US10040052B2 (en) Composite adsorbent for adsorption chiller
CN102744036A (en) Activated carbon/silica-gel/cacl2 composite adsorbent material for air-conditioning applications and a method of preparing the same
CN108844253B (en) Super-high temperature non-azeotropic working medium heat pump unit
US20170173556A1 (en) Adsorption material and method of manufacturing the same and adsorption heat pump
US20120017614A1 (en) Apparatus and Method of Using Nanofluids to Improve Energy Efficiency of Vapor Compression Systems
CN113694902B (en) Ordered lamellar poly amidoxime group graphene oxide composite material for extracting uranium from seawater and preparation method thereof
CN115433308B (en) Hydrophilic-hydrophobic reversible conversion-based moisture absorption material and preparation method and application thereof
CN103987237B (en) A kind of based on solid absorption driving and the electronic-device radiator of heat pipe intensified heat transfer
CN110684509A (en) Environment-friendly mixed refrigerant and heat exchange system
CN110073153A (en) Heat transport apparatus and the hot transfer approach for using it
CN109626389A (en) A kind of hollow molecules sieve of micro-sphere structure and preparation method thereof
Meunier Thermal swing adsorption refrigeration (heat pump)
JP2000262892A (en) Adsorbent and air conditioner for vehicle
CN115305076A (en) Composite pour point depressant and preparation method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant