CN109099611B - Absorption type refrigeration method and device for reducing generation temperature - Google Patents
Absorption type refrigeration method and device for reducing generation temperature Download PDFInfo
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- CN109099611B CN109099611B CN201810722509.5A CN201810722509A CN109099611B CN 109099611 B CN109099611 B CN 109099611B CN 201810722509 A CN201810722509 A CN 201810722509A CN 109099611 B CN109099611 B CN 109099611B
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- 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
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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Abstract
The invention discloses an absorption refrigeration method and a device for reducing generation temperature, wherein the device comprises a generator, a condenser, an evaporator, an absorber, a separating device and a solution heat exchanger, a water vapor outlet of the generator is sequentially connected with water vapor inlets of the condenser, the evaporator and the absorber, a liquid inlet of the absorber is connected with an internal phase liquid outlet of the separating device, a liquid outlet of the absorber is connected with an external phase liquid inlet of the separating device, a first liquid inlet of the solution heat exchanger is connected with a liquid outlet of the generator, a first liquid outlet of the solution heat exchanger is connected with an internal phase liquid inlet of the separating device, a second liquid inlet of the solution heat exchanger is connected with an external phase liquid outlet of the separating device, and a second liquid outlet of the solution heat exchanger is connected with a liquid inlet of the generator. The invention reduces the generated temperature, can adapt to a driving heat source with lower temperature, and can achieve the same cooling effect only by simple equipment.
Description
Technical Field
The invention belongs to the field of absorption refrigeration, and particularly relates to an absorption refrigeration method and device for reducing generation temperature.
Background
In the existing industrial production process, the phenomenon that low-temperature heat sources such as waste heat of a diesel engine, waste heat of flue gas, solar heat and the like cannot be efficiently utilized exists, and serious energy waste and environmental pollution are caused. An absorption refrigeration system is a refrigeration technology using low-grade heat energy as driving energy. At present, a two-stage lithium bromide absorption refrigeration system is developed on the basis of a single-effect lithium bromide absorption refrigeration system, but the two-stage lithium bromide absorption refrigeration system has the defects of low thermodynamic coefficient, high cooling water consumption, high equipment cost and the like, so that a new absorption refrigeration method and a new absorption refrigeration system are required to be provided to solve the problems.
Patent document CN103398488A discloses a double-effect absorption refrigerator using composite working medium, which is composed of an absorber, a generator, an evaporator, a solution pump, a solution heat exchanger, a throttle valve, an ammonia absorber, an ammonia generator, an ammonia condenser, an ammonia evaporator, an ammonia solution pump, an ammonia solution heat exchanger, and an ammonia throttle valve, wherein refrigerant vapor at the outlet of the generator is used as a driving heat medium of the ammonia generator, which can efficiently meet the cooling requirements of users for temperatures above 0 ℃ and below 0 ℃, and has the composite effect of a bromine refrigerator and an ammonia refrigerator.
Patent document CN102645050A discloses an ammonia absorption refrigeration system with adjustable working medium concentration, and relates to the technical field of medium and low temperature waste heat or solar energy utilization. The system comprises a solution pump, a solution heat exchanger, a generator, a rectifying tower, a condenser, a subcooler, an ammonia throttle valve, an evaporator, an absorber, a solution throttle valve, a liquid ammonia storage tank, a flow divider and a flow valve, wherein the switches of the flow divider and the flow valve are controlled by monitoring the pressure of the absorber and the temperature of a cooling medium so as to change the concentration of a basic solution in the unit, so that the basic solution can be changed along with the temperature change of the cooling medium, and the purpose of improving the performance of the system is achieved. The system and the method provided by the patent can enable the unit to operate under the optimal working condition all the year round, and the annual energy saving rate can reach 7.8%.
None of the above patents, however, is able to reduce the occurrence temperature.
Patent document CN102449101A discloses a temperature regulating device implementing an absorption cycle, disclosing compositions comprising lithium bromide, water and at least one ionic compound, which can be used as a working fluid in an absorption cycle system, reducing the crystallization in such absorption cycle systems. The composition disclosed in this patent has a reduced crystallization temperature, resulting in increased solubility at the same temperature, but requires a higher temperature driving heat source to achieve the same generation pressure; or the temperature is reduced under the same concentration, the temperature of the solution at the outlet of the absorber is reduced, and the refrigerating capacity is reduced.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides an absorption refrigeration device capable of reducing the generation temperature, which can adapt to a driving heat source with lower temperature, reduce the generation temperature and realize the resource utilization of a low-temperature heat source.
It is another object of the invention to provide a method of producing refrigeration using the apparatus.
The technical scheme is as follows: the invention relates to an absorption refrigeration device for reducing generation temperature, which comprises a generator, a condenser, an evaporator, an absorber, a separating device and a solution heat exchanger, wherein a water vapor outlet of the generator is sequentially connected with water vapor inlets of the condenser, the evaporator and the absorber, a liquid inlet of the absorber is connected with an internal phase liquid outlet of the separating device, a liquid outlet of the absorber is connected with an external phase liquid inlet of the separating device, a first liquid inlet of the solution heat exchanger is connected with a liquid outlet of the generator, a first liquid outlet of the solution heat exchanger is connected with an internal phase liquid inlet of the separating device, a second liquid inlet of the solution heat exchanger is connected with an external phase liquid outlet of the separating device, and a second liquid outlet of the solution heat exchanger is connected with a liquid inlet.
The refrigeration cycle working medium is a ternary mixed solution of hydrophilic ionic liquid, lithium bromide and water. The hydrophilic ionic liquid and the lithium bromide are used as absorbents and are both liquid under the working state, and water is used as a refrigerant.
The hydrophilic ionic liquid comprises cations and anions, wherein the cations are methylimidazole cations containing alkyl substituents, and the structural formula of the methylimidazole cations is as follows:
wherein R is1Is C1-C4 straight chain or branched chain alkyl,
the anion is acetate, tetrafluoroborate or halide.
Preferably, the hydrophilic ionic liquid is [ Emim ] OAc, [ Dmim ] OAc, [ Emim ] BF4, [ Bmim ] BF4, [ Emim ] Cl, [ Dmim ] Cl, [ Bmim ] I or [ Hmim ] Br, more preferably [ Emim ] OAc.
The separation device is comprised of an inner phase, an outer phase, and a liquid membrane separating the inner phase from the outer phase. The liquid membrane is made of phospholipid bilayers and has unidirectional selective permeability, anions and cations of the ionic liquid are allowed to pass through, bromide ions, lithium ions, hydrogen ions and hydroxide ions are not allowed to pass through, and the flow direction of the ionic liquid is only the direction from the inner phase to the outer phase. After the ternary mixture flowing out of the solution heat exchanger enters the internal phase of the separation device, the ionic liquid enters the external phase of the separation device through the liquid membrane, and the lithium bromide solution flows out of the internal phase and enters the absorber. And the lithium bromide solution flowing out of the absorber enters an external phase of the separation device, is mixed with the ionic liquid in the external phase to form a ternary mixed solution, and then enters the solution heat exchanger. The flow range of the ionic liquid is limited between the separation device and the generator, and the ionic liquid does not enter the absorber.
Including a first throttle valve disposed between the condenser and the evaporator, and a second throttle valve disposed between the separation device and the absorber.
And a solution pump is also arranged between the liquid outlet of the absorber and the separation device.
The method for refrigerating by using the device comprises the following steps:
step 1: the generator outputs water vapor in a high-pressure state, and the water vapor enters the condenser to be condensed into liquid water;
step 2: liquid water enters the evaporator, phase change occurs to generate water vapor, and the evaporator outputs cold energy outwards;
and step 3: the water vapor generated by the evaporator enters an absorber and is absorbed by the lithium bromide concentrated solution to form a lithium bromide dilute solution, and the lithium bromide dilute solution enters the external phase of the separation device and is mixed with the ionic liquid to form a ternary mixed dilute solution;
and 4, step 4: the ternary mixed dilute solution in the outer phase of the separation device flows into a solution heat exchanger, is heated by the ternary mixed concentrated solution from the generator, is heated by a driving heat source in the generator, and is concentrated into the ternary mixed concentrated solution to generate water vapor in a high-pressure state;
and 5: the ternary mixed concentrated solution in the generator flows into a solution heat exchanger, releases heat to the ternary mixed dilute solution from the absorber, and then enters the inner phase of the separation device;
step 6: in the inner phase of the separation device, the lithium bromide concentrated solution and the ionic liquid in the ternary mixed concentrated solution are separated, the ionic liquid enters the outer phase of the separation device, the lithium bromide concentrated solution enters the absorber, and the steps are repeated to form a cycle
The cooling water flowing out of the cooling tower flows through the absorber and the condenser through the cooling water pipe, absorbs the heat of absorption and condensation, and enters the cooling tower again through the cooling water pump for cooling.
Preferably, the method for refrigerating by using the device comprises the following steps:
step 1: the generator outputs water vapor in a high-pressure state, and the water vapor enters the condenser to be cooled by cooling water in the cooling water pipe and is condensed into liquid water;
step 2: liquid water enters the evaporator through the throttle valve, the working medium absorbs heat through phase change, and the evaporator outputs cold energy outwards;
and step 3: gaseous refrigerant (water vapor) generated by the evaporator enters the absorber and is absorbed by the lithium bromide concentrated solution to form a lithium bromide dilute solution, the absorption heat of the solution is released to cooling water, and the lithium bromide dilute solution enters the outer phase of the separation device through the solution pump and is mixed with the ionic liquid to form a ternary mixed dilute solution.
And 4, step 4: the ternary mixed dilute solution in the outer phase of the separation device flows into a heat exchanger, is heated by the ternary mixed concentrated solution from a generator, is heated by a driving heat source at about 70 ℃ in the generator, and is concentrated into the ternary mixed concentrated solution to generate water vapor under a high pressure state.
And 5: the ternary mixed concentrated solution in the generator flows into the heat exchanger under the action of pressure difference and phase difference, releases heat to the ternary mixed dilute solution from the absorber, and then enters the internal phase of the separation device.
Step 6: in the inner phase of the separation device, the lithium bromide concentrated solution and the ionic liquid in the ternary mixed concentrated solution are separated, the ionic liquid enters the outer phase of the separation device, the lithium bromide concentrated solution enters the absorber, and the steps are repeated to form a cycle.
And 7: the cooling water flowing out of the cooling tower flows through the absorber and the condenser through the cooling water pipe, absorbs the heat of absorption and condensation, and enters the cooling tower again through the cooling water pump for cooling, so that cooling water circulation is formed.
The working principle is as follows: (1) experiments show that the ternary mixed solution formed by adding the ionic liquid into the lithium bromide solution has higher saturated vapor pressure at the same temperature compared with the original lithium bromide solution, and the temperature of the ternary mixed solution of the ionic liquid, the lithium bromide and the water is lower than that of the lithium bromide solution when the same surface vapor pressure is reached. Therefore, the absorption refrigeration system of the invention has lower generation temperature under the same generator outlet pressure, and can adapt to a driving heat source with lower temperature. And the separation device separates the ionic liquid in the solution entering the absorber, so that the ionic liquid does not obstruct the absorption process of the lithium bromide solution.
(2) The driving potential of the absorption process in the absorber is the pressure difference between the evaporator and the absorber, the water vapor pressure in the absorber is lower than the vapor pressure of the low-temperature water in the evaporator, and then the refrigerant vapor evaporated from the evaporator can be absorbed by the concentrated solution in the absorber. If no separation device is provided, the ionic liquid enters the absorber, the concentrated solution in the absorber is a ternary mixture of lithium bromide, the ionic liquid and water, and because the saturated vapor pressure of the ternary mixture solution is higher than that of the lithium bromide solution at the same temperature, the pressure difference between the absorber and the vapor pressure is reduced, and the absorption effect is weakened. Thus, without the separating means, the absorption process is impaired.
Has the advantages that:
1. according to the absorption refrigeration device for reducing the generation temperature, the refrigeration cycle working medium is an ionic liquid-lithium bromide-water ternary mixed solution, and the surface vapor pressure of the refrigeration cycle working medium is greater than that of the lithium bromide solution at the same temperature, so that the generation temperature is reduced under the same generator outlet pressure, and the absorption refrigeration device can adapt to a driving heat source at a lower temperature.
2. Compared with a single-effect lithium bromide absorption refrigeration system, the absorption refrigeration system for reducing the generation temperature reduces the generation temperature and can adapt to a driving heat source with lower temperature; compared with a two-stage lithium bromide absorption refrigeration system, the same cooling effect can be achieved only by simple equipment.
3. The invention arranges a separation device between the solution heat exchanger and the absorber, reduces the temperature of the driving heat source of the generator, and separates the ionic liquid without influencing the absorption process and the refrigeration performance coefficient of the system.
Drawings
FIG. 1 is a schematic structural diagram of an absorption refrigeration unit for reducing generation temperature according to the present invention;
fig. 2 is a graph of saturated vapor pressure as a function of temperature.
Detailed Description
Referring to fig. 1, an absorption refrigeration apparatus for reducing a generation temperature includes a separation device 1, a solution heat exchanger 2, a driving heat source 3, a generator 4, a condenser 5, a cooling tower 6, a throttle valve 7, an evaporator 8, a chilled water pipe 9, a cooling water pipe 10, a cooling water pump 11, an absorber 12, a solution pump 13, and a throttle valve 14.
The separation device 1 consists of an internal phase, an external phase and a liquid membrane separating the internal phase from the external phase. The separation device is comprised of an inner phase, an outer phase, and a liquid membrane separating the inner phase from the outer phase. The liquid membrane is made of phospholipid bilayers, the membrane thickness is 1mm, the membrane has one-way selective permeability, anions and cations of the ionic liquid are allowed to pass through, bromide ions, lithium ions, hydrogen ions and hydroxide ions are not allowed to pass through, and the flow direction of the ionic liquid is only the direction from the inner phase to the outer phase.
The water vapor outlet of the generator 4 is connected with the condenser 5, the throttle valve 7, the evaporator 8 and the water vapor inlet of the absorber 12 in sequence, the liquid inlet of the absorber 12 is connected with the outlet of the throttle valve 14, the inlet of the throttle valve 14 is connected with the internal liquid outlet of the separation device 1, the liquid outlet of the absorber 12 is connected with the inlet of the solution pump 13, the outlet of the solution pump 13 is connected with the external liquid inlet of the separation device 1, the first liquid inlet of the solution heat exchanger 2 is connected with the liquid outlet of the generator 4, the first liquid outlet of the solution heat exchanger 2 is connected with the internal liquid inlet of the separation device 1, the second liquid inlet of the solution heat exchanger 2 is connected with the external liquid outlet of the separation device 1, and the second liquid outlet of the solution heat exchanger 2 is connected with. The chilled water line 9 is connected to the evaporator 8 and the driving heat source 3 is connected to the generator 4. The cooling water in the cooling tower 6 flows through the absorber 12 and the condenser 5 via the cooling water pipe 10, and then returns to the cooling tower 6 by the cooling water pump 11, thereby forming a cooling water circulation.
The method for refrigerating by using the device comprises the following steps:
when the unit works, the ternary mixed solution containing the ionic liquid in the generator 4 is heated by the driving heat source 3 (waste heat of a diesel engine, waste heat of flue gas, solar energy and the like), the generated water vapor flows into the condenser 5, and the water vapor releases heat to the cooling water pipe 10 in the condenser 5 and is condensed into refrigerant water. The refrigerant water flowing out of the condenser 5 enters the evaporator 8 after being throttled by the throttle valve 7. The refrigerant water evaporates in the evaporator 8 and absorbs heat to the freezing water pipe 9 to cool it and generate a refrigerating effect. The water vapor produced in the evaporator 8 enters the absorber 12, completing the refrigerant circuit of the refrigeration system.
The concentrated lithium bromide solution in the absorber 12 absorbs the water vapor from the evaporator 8 to form a dilute lithium bromide solution, the heat of absorption of the solution is discharged to the cooling water pipe 10, the pressure is increased by the solution pump 13, the dilute lithium bromide solution enters the external phase of the separation device 1 and is mixed with the ionic liquid [ Emim ] OAc to form a ternary mixed dilute solution containing the ionic liquid. The ternary mixed dilute solution containing the ionic liquid enters the solution heat exchanger 2, exchanges heat with the concentrated solution from the generator 4, enters the generator 4 through the second liquid outlet, is heated by a driving heat source 3 (hot water, heating steam and the like) at 70 ℃, generates a gaseous refrigeration working medium (water vapor) in a high-pressure state, and is concentrated into the concentrated solution.
The concentrated solution from the generator 4 enters the solution heat exchanger 2 through the first liquid inlet under the action of the pressure difference and the phase difference, releases heat to the dilute solution from the absorber 12, and then flows out through the first liquid outlet to enter the inner phase of the separation device 1. In the internal phase of the separation device 1, the lithium bromide concentrated solution in the ternary mixed concentrated solution is separated from the ionic liquid, the ionic liquid enters the external phase of the separation device 1 through a liquid membrane, and the lithium bromide concentrated solution enters an absorber 12 through a throttle valve 7.
The cooling water flowing out from the cooling tower 6 flows through the absorber 12 and the condenser 5 through the cooling water pipe 10, absorbs the heat of absorption and the heat of condensation, and enters the cooling tower 6 again by the cooling water pump 11 for cooling.
The refrigeration working medium adopted by the embodiment is ionic liquid [ Emim]Ternary mixed solution of OAc, lithium bromide and water. 50g of 55% by weight brominating solution are preparedMeasuring the saturated vapor pressure of the lithium bromide aqueous solution at the temperature of 30-80 ℃ by using a static pressure method; to the lithium bromide solution was added 45g [ Emim ]]OAc, formation of 29% LiBr + 47% [ Emim%]The OAc ternary mixed solution is prepared by measuring the saturated vapor pressure of the ternary mixed solution at 30-70 deg.C by static pressure method, and plotting the variation curve of the saturated vapor pressure with temperature of the ternary mixed solution as shown in FIG. 2. As can be seen from FIG. 2, when the saturated vapor pressure of the solution is close to 10000Pa, the temperature of the 55% LiBr solution is 80 ℃ and 29% LiBr + 47% [ Emim ]]The temperature of the OAc ternary mixed solution is 70 ℃, and the temperature difference is delta ThIs 10 ℃. That is, when the outlet pressure of the generator is close to 10000Pa, the single-effect lithium bromide absorption refrigeration system needs a driving heat source of 80 ℃, while the absorption refrigeration system for reducing the generation temperature only needs a driving heat source of 70 ℃, and the generation temperature is reduced by 10 ℃.
Compared with a single-effect lithium bromide absorption refrigeration system, the invention reduces the generation temperature and can adapt to a driving heat source with lower temperature; compared with a two-stage lithium bromide absorption refrigeration system, the invention can achieve the same cooling effect only by simple equipment.
Claims (6)
1. An absorption refrigeration device for reducing generation temperature is characterized by comprising a generator (4), a condenser (5), an evaporator (8), an absorber (12), a separating device (1) and a solution heat exchanger (2), wherein a vapor outlet of the generator (4) is sequentially connected with the condenser (5), the evaporator (8) and a vapor inlet of the absorber (12), a liquid inlet of the absorber (12) is connected with an inner-phase liquid outlet of the separating device (1), a liquid outlet of the absorber (12) is connected with an outer-phase liquid inlet of the separating device (1), a first liquid inlet of the solution heat exchanger (2) is connected with a liquid outlet of the generator (4), a first liquid outlet of the solution heat exchanger (2) is connected with an inner phase of the separating device (1), a second liquid inlet of the solution heat exchanger (2) is connected with an outer-phase liquid outlet of the separating device (1), a second liquid outlet of the solution heat exchanger (2) is connected with a liquid inlet of the generator (4); the separation device (1) consists of an inner phase, an outer phase and a liquid film, wherein the liquid film separates the inner phase from the outer phase, the material of the liquid film is a phospholipid bilayer, the thickness of the film is 1mm, the liquid film has one-way selective permeability, anions and cations of ionic liquid are allowed to pass through, bromide ions, lithium ions, hydrogen ions and hydroxyl ions are not allowed to pass through, and the flow direction of the ionic liquid is only the direction from the inner phase to the outer phase; the refrigeration cycle working medium is a ternary mixed solution of hydrophilic ionic liquid, lithium bromide and water; the hydrophilic ionic liquid comprises cations and anions, wherein the cations are methylimidazole cations containing alkyl substituents, and the structural formula of the methylimidazole cations is as follows:
wherein R is1Is C1-C4 straight chain or branched chain alkyl,
the anion is acetate, tetrafluoroborate or halide.
2. The device of claim 1, wherein the hydrophilic ionic liquid is [ Emim ] OAc, [ Dmim ] OAc, [ Emim ] BF4, [ Bmim ] BF4, [ Emim ] Cl, [ Dmim ] Cl, [ Bmim ] I, or [ Hmim ] Br.
3. An arrangement according to claim 1, characterized by a first throttle valve (7) arranged between the condenser (5) and the evaporator (8), and a second throttle valve (14) arranged between the separation device (1) and the absorber (12).
4. The apparatus according to claim 1, wherein the freezing water pipe (9) is connected to the evaporator (8), and the cooling tower (6), the absorber (12), the condenser (5), and the cooling water pump (11) are connected by the cooling water pipe (10) to form a cooling water circulation loop.
5. Method for producing refrigeration by means of a device according to any of claims 1-4, characterized in that it comprises the following steps:
step 1: the generator outputs water vapor in a high-pressure state, and the water vapor enters the condenser to be condensed into liquid water;
step 2: liquid water enters the evaporator, phase change occurs to generate water vapor, and the evaporator outputs cold energy outwards;
and step 3: the water vapor generated by the evaporator enters an absorber and is absorbed by the lithium bromide concentrated solution to form a lithium bromide dilute solution, and the lithium bromide dilute solution enters the external phase of the separation device and is mixed with the ionic liquid to form a ternary mixed dilute solution;
and 4, step 4: the ternary mixed dilute solution in the outer phase of the separation device flows into a solution heat exchanger, is heated by the ternary mixed concentrated solution from the generator, is heated by a driving heat source in the generator, and is concentrated into the ternary mixed concentrated solution to generate water vapor in a high-pressure state;
and 5: the ternary mixed concentrated solution in the generator flows into a solution heat exchanger, releases heat to the ternary mixed dilute solution from the absorber, and then enters the inner phase of the separation device;
step 6: in the inner phase of the separation device, the lithium bromide concentrated solution and the ionic liquid in the ternary mixed concentrated solution are separated, the ionic liquid enters the outer phase of the separation device, the lithium bromide concentrated solution enters the absorber, and the steps are repeated to form a cycle.
6. The method as claimed in claim 5, wherein the cooling water flowing out from the cooling tower flows through the absorber and the condenser through the cooling water pipe, absorbs the heat of absorption and condensation, and enters the cooling tower again by the cooling water pump for cooling.
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|---|---|---|---|---|
| CN1645012A (en) * | 2005-01-20 | 2005-07-27 | 宣伯民 | Lithium bromide absorbing refrigerator of membrane separation concentrating solution |
| CN201209974Y (en) * | 2008-04-21 | 2009-03-18 | 上海海事大学 | Novel film distillation backheating absorption refrigerating plant |
| CN201992924U (en) * | 2011-01-21 | 2011-09-28 | 东南大学 | Ice-slurry preparing device based on lithium bromide absorption refrigeration cycle |
| CN102292608A (en) * | 2008-11-26 | 2011-12-21 | 纳幕尔杜邦公司 | Absorption cycle system having dual absorption circuits |
| CN102365342A (en) * | 2009-03-31 | 2012-02-29 | 纳幕尔杜邦公司 | Temperature adjustment device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645012A (en) * | 2005-01-20 | 2005-07-27 | 宣伯民 | Lithium bromide absorbing refrigerator of membrane separation concentrating solution |
| CN201209974Y (en) * | 2008-04-21 | 2009-03-18 | 上海海事大学 | Novel film distillation backheating absorption refrigerating plant |
| CN102292608A (en) * | 2008-11-26 | 2011-12-21 | 纳幕尔杜邦公司 | Absorption cycle system having dual absorption circuits |
| CN102365342A (en) * | 2009-03-31 | 2012-02-29 | 纳幕尔杜邦公司 | Temperature adjustment device |
| CN201992924U (en) * | 2011-01-21 | 2011-09-28 | 东南大学 | Ice-slurry preparing device based on lithium bromide absorption refrigeration cycle |
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