CN112762634B - Refrigerator - Google Patents
Refrigerator Download PDFInfo
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- CN112762634B CN112762634B CN202110156237.9A CN202110156237A CN112762634B CN 112762634 B CN112762634 B CN 112762634B CN 202110156237 A CN202110156237 A CN 202110156237A CN 112762634 B CN112762634 B CN 112762634B
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- China
- Prior art keywords
- absorber
- generator
- absorption
- evaporator
- group
- Prior art date
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- 239000006096 absorbing agent Substances 0.000 claims abstract description 133
- 238000001704 evaporation Methods 0.000 claims abstract description 79
- 230000008020 evaporation Effects 0.000 claims abstract description 79
- 238000010521 absorption reaction Methods 0.000 claims abstract description 74
- 239000000498 cooling water Substances 0.000 claims abstract description 67
- 239000003507 refrigerant Substances 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 230000002745 absorbent Effects 0.000 claims abstract description 49
- 239000002250 absorbent Substances 0.000 claims abstract description 49
- 238000004891 communication Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 15
- 238000001816 cooling Methods 0.000 abstract description 14
- 238000005057 refrigeration Methods 0.000 abstract description 13
- 239000000243 solution Substances 0.000 description 113
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 18
- 239000007788 liquid Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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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
- F25B33/00—Boilers; Analysers; Rectifiers
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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
- F25B37/00—Absorbers; Adsorbers
-
- 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
- F25B39/00—Evaporators; Condensers
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention relates to a refrigerator, which comprises at least two groups of absorption and evaporation systems connected in series in sequence, wherein an evaporator is communicated with an absorber to enable refrigerant steam in the evaporator to flow into the absorber, the absorber of the former group of absorption and evaporation system is communicated with the absorber of the latter group of absorption and evaporation system in at least two groups of absorption and evaporation systems to enable absorbent solution in the absorber of the former group of absorption and evaporation system to flow into absorbent solution in the absorber of the latter group of absorption and evaporation system, a pipeline for cooling water to flow is arranged in the absorber of the last group of absorption and evaporation system, and a pipeline for external cold water to flow is arranged in the evaporator of the first group of absorption and evaporation system. By enlarging the circulating concentration and circulating path of the solution and increasing the circulating amount of the refrigerant, the temperature of the cooling water used in refrigeration is higher, the temperature of the heat source water used in heating is lower, and meanwhile, the heating and the refrigerating are carried out, so that the cooling water prepared by a cooling tower is not needed, and the energy utilization rate is improved.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a refrigerator.
Background
The lithium bromide refrigerating unit is one refrigerating apparatus with steam, hot water and fuel as heat source and cooling water as cold source. Because of the advantages of recycling waste heat, no pollution to the environment, convenient unit maintenance and the like, the unit is more and more widely used in the fields of air conditioning, process refrigeration and the like. The lithium bromide unit has two basic working conditions, namely a refrigeration working condition and a heat pump working condition. In the refrigerating working condition, the user uses the cold water output by the evaporator, the cooling water needs the cooling water generated by a cooling tower or other modes, the temperature of the inlet of the cooling water cannot be too high, and in the heat pump working condition, the user uses the cooling water (also called heat supply network water), and the cold water in the evaporator is used as a heat-taking heat source, so the heat source water is also called heat source water.
The conventional refrigeration working condition is that cold water is 12-7 ℃, cooling water is 32-38 ℃, the higher the cooling water inlet temperature is, the more the capacity is attenuated, and the cooling water inlet temperature is higher than 40 ℃ and the unit is stopped in an alarm mode. In the occasion that the cooling water needs water conservation to use, or the occasion that the cooling water temperature is very high, for example desert water shortage area, the region that the cooling water can't be evaporated and cooled etc., can't use traditional cooling tower system to evaporate cooling for the cooling water, can only use the air-cooled cooling time, can lead to cooling water entry high temperature (more than or close 40 ℃) this moment, conventional lithium bromide refrigerating unit can't operate.
The existing heat pump is used for preparing 60 ℃ hot water, heat source water with the temperature of about 30-20 ℃ is needed, and heat of the heat source water with the temperature of about 12 ℃ cannot be utilized. In the case of too low a heat source water temperature or in the case of fully utilizing heat, such as geothermal heat (using the heat source water temperature of 15-9 ℃) and the like, water with the temperature of more than 60 ℃ is prepared, and the conventional lithium bromide unit cannot be realized.
In the occasion that the refrigeration and heating are used simultaneously, the existing refrigeration machine can meet the requirements of refrigeration and heating simultaneously, and still needs to take part in refrigeration cycle by about 32 ℃ of cooling water, so that the output cooling water is usually required to be introduced into a cooling tower for cooling to about 32 ℃ and then takes part in refrigeration cycle, and thus, the electric energy and the heat of the cooling tower are wasted greatly.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a refrigerator which can increase the temperature of cooling water used in refrigeration and the temperature of heat source water used in heating by increasing a solution absorption link, expanding the circulating concentration and the circulating path of the solution and increasing the circulating quantity of the refrigerant by increasing a refrigerant evaporation link, so that the cooling water prepared by a cooling tower is not needed in the working condition of heating and refrigeration at the same time, and the energy utilization rate is improved.
The technical scheme includes that the refrigerator comprises at least two groups of absorption and evaporation systems which are sequentially connected in series, wherein each absorption and evaporation system comprises an evaporator and an absorber, the evaporator is communicated with the absorber to enable refrigerant vapor in the evaporator to flow into the absorber, the absorbers of the former group of absorption and evaporation systems are communicated with the absorbers of the latter group of absorption and evaporation systems in at least two groups of absorption and evaporation systems to enable absorbent solution in the absorbers of the former group of absorption and evaporation systems to flow into absorbent solution in the absorbers of the latter group of absorption and evaporation systems, a pipeline for cooling water circulation is arranged in the absorber of the last group of absorption and evaporation systems, and a pipeline for external cold water circulation is arranged in the evaporator of the first group of absorption and evaporation systems.
Preferably, in at least two groups of the absorption and evaporation systems, the absorbers of the previous group of the absorption and evaporation systems are communicated with the evaporators of the subsequent group of the absorption and evaporation systems, so that the cooling water in the absorbers of the previous group of the absorption and evaporation systems flows into the evaporator cooling water of the subsequent group of the absorption and evaporation systems to form an internal circulation water circulation route.
Preferably, the refrigerator further comprises a first generator and a condenser, wherein the first generator is communicated with the condenser, so that the refrigerant steam in the first generator flows into the condenser, the first generator is communicated with the absorbers of the first group of absorption and evaporation systems, so that the absorbent solution in the first generator flows into the absorbent solution of the absorbers of the first group of absorption and evaporation systems, and the evaporator of the last group of absorption and evaporation systems is communicated with the condenser, so that the condensed water in the condenser flows into the evaporator of the last group of absorption and evaporation systems.
Preferably, the refrigerator further comprises a channel for circulating a heat supply fluid is arranged in the first generator.
Preferably, a channel for cooling water to circulate is arranged in the condenser, the channel for cooling water to circulate in the condenser is communicated with the channel for cooling water to circulate in the absorber of the absorption and evaporation system of the last group, and external cooling water sequentially flows through the absorber of the absorption and evaporation system of the last group and the condenser to form a cooling water circulation line.
Preferably, the refrigerator further comprises a second generator, a pipeline for flowing a heat supply source is arranged in the second generator, the second generator is communicated with the first generator, and the refrigerant steam in the second generator is used as a heat source to flow into the first generator, so that the absorbent solution of the first generator is heated.
Preferably, the at least two groups of absorption and evaporation systems comprise a first shell, a second shell and a second shell, wherein the first shell is internally provided with a first evaporator and a first absorber, the first evaporator is communicated with the first absorber, and the second shell is internally provided with a second evaporator and a second absorber, and the second evaporator is communicated with the second absorber.
Preferably, the second absorber, the first generator, the second generator and the first absorber are sequentially communicated to form a first absorbent solution circulation line, or the second absorber is sequentially communicated with the second generator and the first generator respectively, and the second generator and the first generator are sequentially communicated with the first absorber respectively to form a second absorbent solution circulation line, or the second absorber, the second generator, the first generator and the first absorber are sequentially communicated to form a third absorbent solution circulation line.
Preferably, the absorbent solution is lithium bromide aqueous solution, the concentration of the lithium bromide aqueous solution is 42-65%, and the refrigerant is water.
Preferably, the cooling water is input at a temperature of 40 ℃ and the cold water is input at a temperature of 12-16 ℃.
The technical scheme of the invention has the following advantages:
1. The refrigerator provided by the invention can obviously improve the required temperature of cooling water in the use environment of the refrigerator, and can be improved to a higher temperature from about 32 ℃ originally, so that the use range of the cooling water temperature of the refrigerator is enlarged.
2. The refrigerator provided by the invention can obviously reduce the required temperature of heat source water in the use environment of the heat pump from about 20 ℃ to lower temperature, can effectively utilize the waste heat of low-temperature heat source water and saves energy.
3. The refrigerator provided by the invention is used in the environment of heating and refrigerating, and can output cold water with preset temperature when the input temperature of low-temperature heat source water is lower;
Meanwhile, the cooling water with higher temperature is supplied, hot water with preset temperature can be output, cooling water prepared by a cooling tower is not needed, and the energy utilization rate is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a refrigerator according to the present invention;
FIG. 2 is a schematic diagram of a refrigerator according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of another refrigerator according to the present invention;
FIG. 4 is a schematic diagram of a refrigerator according to another embodiment of the present invention;
11-first evaporator, 12-first absorber, 13-second evaporator, 14-second absorber, 15-internal circulation pump, 16-first refrigerant pump, 17-second refrigerant pump, 18-first generator, 19-second generator, 20-condenser, 21-first heat exchanger, 22-second heat exchanger, 23-first concentrated solution pump, 24-second concentrated solution pump, 25-first solution pump, 26-second solution pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present application fall within the protection scope of the present application.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In order to keep the following description of the embodiments of the present application clear and concise, the detailed description of known functions and known components thereof have been omitted.
The embodiment of the invention provides a refrigerator, which is shown in figures 1-4 and comprises at least two groups of absorption and evaporation systems which are sequentially connected in series, wherein the absorption and evaporation systems comprise an evaporator and an absorber, the evaporator is communicated with the absorber so that refrigerant vapor in the evaporator flows into the absorber, the absorbers of the former group of absorption and evaporation systems are communicated with the absorbers of the latter group of absorption and evaporation systems so that absorbent solution in the absorbers of the former group of absorption and evaporation systems flows into absorbent solution in the absorbers of the latter group of absorption and evaporation systems, a pipeline for cooling water circulation is arranged in the absorber of the last group of absorption and evaporation systems, and a pipeline for external cold water circulation is arranged in the evaporator of the first group of absorption and evaporation systems.
Some embodiments of the invention are two groups of absorption and evaporation systems which are sequentially connected in series, wherein the two groups of absorption and evaporation systems comprise a first shell, a second shell, a first absorber and evaporation system, a second absorber and evaporation system, wherein a first evaporator 11 and a first absorber 12 are arranged in the first shell, the first evaporator 11 is communicated with the first absorber 12, a second evaporator 13 is arranged in the second shell, the second evaporator 13 is communicated with the second absorber 14, the first absorber 12 is communicated with the second absorber 14, an absorbent solution flows through the first absorber 12 when being set to be a concentrated solution, the concentrated solution absorbs the refrigerant steam of the first evaporator 11 and then outputs a medium-concentration solution, the medium-concentration solution enters the second absorber 14, the medium-concentration solution absorbs the refrigerant steam of the second evaporator 13 and then outputs a dilute solution, an absorbent solution circulation line is formed, the concentrated solution is diluted step by step and releases heat, cooling water flows through the second absorber 14, the cooling water is heated up in the second absorber 14 and then outputs, and cold water flows through the first evaporator 11 and the first evaporator 11 exchanges heat with the refrigerant steam to a preset temperature, and then outputs the cold water. The cold water (low temperature heat source water) releases heat and lowers the temperature in the tube side of the first evaporator 11, the concentrated solution enters the first absorber 12 to absorb the refrigerant steam from the first evaporator 11, the refrigerant steam is liquefied and dissolved in the concentrated solution, the concentrated solution is diluted into the intermediate concentration solution and releases heat, the second absorber 14 is added in the circulation of the internal absorbent solution, the first-stage solution absorption link is added, the circulation concentration change and the circulation path of the solution are enlarged, the intermediate concentration solution enters the second absorber 14 and absorbs the refrigerant steam of the second evaporator 13 and then outputs the diluted solution and releases heat, the second evaporator 13 is added in the refrigerant circulation, the first-stage refrigerant evaporation link is added, and the refrigerant circulation quantity is increased, so that the temperature of the cooling water used in refrigeration is high, and the temperature of the heat source water used in heating is low. Meanwhile, the refrigerator provided by the invention can be suitable for high-temperature cooling water and low-temperature heat source water.
In the exemplary embodiment, the evaporator, absorber, generator and condenser all use shell-and-tube heat exchangers, the water circuit circulates in the tube side, the absorbent solution circulates in the shell side, and the refrigerant introduced by the evaporator circulates in the shell side.
And in at least two groups of absorption and evaporation systems, the absorbers of the previous group of absorption and evaporation systems are communicated with the evaporators of the next group of absorption and evaporation systems, so that the cooling water in the absorbers of the previous group of absorption and evaporation systems flows into the cooling water of the evaporators of the next group of absorption and evaporation systems to form an internal circulating water circulation route.
The refrigerator further comprises a first generator 18 and a condenser 20, wherein the first generator 18 is communicated with the condenser 20, so that the refrigerant steam in the first generator 18 flows into the condenser 20, the first generator 18 is communicated with the absorbers of the first group of absorption and evaporation systems, so that the absorbent solution in the first generator 18 flows into the absorbent solution of the absorbers of the first group of absorption and evaporation systems, and the evaporator of the last group of absorption and evaporation systems is communicated with the condenser 20, so that the condensed water in the condenser 20 flows into the evaporator of the last group of absorption and evaporation systems.
The refrigerator further comprises a channel in said first generator 18 through which a heating source fluid is circulated.
The condenser 20 is provided with a channel for cooling water to circulate, the channel for cooling water to circulate in the condenser 20 is communicated with the channel for cooling water to circulate in the absorber of the last group of the absorption and evaporation systems, and external cooling water sequentially flows through the absorber of the last group of the absorption and evaporation systems and the condenser 20 to form a cooling water circulation line.
The refrigerator further comprises a second generator 19, wherein a pipeline for flowing a heat supply source is arranged in the second generator 19, the second generator 19 is communicated with the first generator 18, and the refrigerant steam in the second generator 19 is used as a heat source to flow into the first generator 18, so that the absorbent solution of the first generator 18 is heated.
The second absorber 14, the first generator 18, the second generator 19 and the first absorber 12 are sequentially communicated to form a first absorbent solution circulation line, or the second absorber 14 is sequentially communicated with the second generator 19 and the first generator 18 respectively, and the second generator 19 and the first generator 18 are sequentially communicated with the first absorber 12 respectively to form a second absorbent solution circulation line, or the second absorber 14, the second generator 19, the first generator 18 and the first absorber 12 are sequentially communicated to form a third absorbent solution circulation line.
In order to better transfer heat, the first absorber 12 is preferably in communication with the second evaporator 13, an internal circulation pump 15 is disposed outside the first housing and the second housing, and internal circulation water sequentially flows through the first absorber 12, the second evaporator 13 and the internal circulation pump 15 to form an internal circulation water circulation path, and the internal circulation water cools the concentrated solution in the first absorber 12. The internal circulation water absorbs heat in the first absorber 12 to raise temperature, and simultaneously cools the concentrated solution in the first absorber 12, and releases heat in the second evaporator 13 to lower temperature, thereby forming circulation to complete heat transfer, so that the heat transfer flow of cooling water is increased, and the evaporation of the refrigerant of the second evaporator 13 can be better realized.
The first shell is provided with a first refrigerant pump 16 at the outside, the first refrigerant pump 16 is communicated with the outlet of the first evaporator 11 through a pipeline, the first refrigerant sequentially flows through the first evaporator 11 and the first refrigerant pump 16 and then enters the first evaporator 11 to form a first refrigerant circulation route, the second shell is provided with a second refrigerant pump 17 at the outside, the second refrigerant pump 17 is communicated with the outlet of the second evaporator 13 through a pipeline, and the second refrigerant sequentially flows through the second evaporator 13 and the second refrigerant pump 17 and then enters the second evaporator 13 to form a second refrigerant circulation route. The first refrigerant forming cycle can make the refrigerant exchange heat with the cold water for a plurality of times, and the second refrigerant forming cycle can make the refrigerant of the second evaporator 13 become steam after being heated, and then enter the second absorber 14 for liquefying and diluting the intermediate concentration solution. The first evaporator 11 and the second evaporator 13 can be connected through a pipeline to realize refrigerant communication.
In some embodiments of the present invention, the refrigerator further comprises a generator for heating and concentrating the dilute solution, the generator comprises a first generator 18 and a second generator 19, the second generator 19 heats the absorbent solution by using high-temperature steam as a heat source to generate refrigerant steam, the second generator 19 is communicated with the first generator 18, the refrigerant steam enters the first generator 18 to heat the absorbent solution of the first generator 18, the absorbent solution generates the refrigerant steam, the condenser 20 is used for cooling the refrigerant steam generated by the first generator 18 and the second generator 19, condensing the refrigerant steam into liquid refrigerant and heating the cooling water by using heat released in the condensation process, the condenser 20 is communicated with the first generator 18, the condenser 20 is communicated with the second evaporator 13, the liquid refrigerant in the condenser 20 enters the second evaporator 13, and the cooling water sequentially flows through the second absorber 14 and the condenser 20 to form a cooling water circulation line. When the liquid refrigerant in the condenser 20, namely liquid water, enters the second evaporator 13, the liquid refrigerant expands rapidly to vaporize, and the heat of the circulating cooling water in the second evaporator 13 is absorbed in a large amount in the vaporization process, so that the purposes of cooling and refrigerating are achieved.
The second generator 19 has two substances in its shell side, one is the concentrated absorbent solution, and the other is the vapor (refrigerant vapor) generated after the solution is concentrated, and this vapor enters the tube side of the first generator 18 as the heat source of the first generator 18 to heat the absorbent solution in the shell side of the first generator 18.
The dilute solution output by the second absorber 14 sequentially flows through the first generator 18 and the second generator 19 to form a concentrated solution, and then sequentially enters the first absorber 12 and the second absorber 14 to form an absorbent solution circulation line, or the dilute solution output by the second absorber 14 sequentially flows through the second generator 19 and the first generator 18 to form a concentrated solution, and then sequentially enters the first absorber 12 and the second absorber 14 to form an absorbent solution circulation line, or the dilute solution output by the second absorber 14 only flows through the second generator 19 or the first generator 18 to form a concentrated solution, and then sequentially enters the first absorber 12 and the second absorber 14 to form an absorbent solution circulation line, or the dilute solution output by the second absorber 14 respectively flows through the second generator 19 and the first generator 18 in two branches at the same time to form a concentrated solution, and then sequentially enters the first absorber 12 and the second absorber 14 to form an absorbent solution circulation line.
In some embodiments of the invention, the refrigerator further comprises a heat exchanger for effecting heat exchange between the concentrated solution and the diluted solution, the heat exchanger comprising a first heat exchanger 21 and a second heat exchanger 22, the first heat exchanger 21 and the second heat exchanger 22 each being disposed on the absorbent solution circulation line, the first heat exchanger 21 being located between the second absorber 14 and the first generator 18, the second heat exchanger 22 being located between the first generator 18 and the second generator 19. The temperature of the dilute solution output from the second absorber 14 is low, in order to save the heat for heating the dilute solution and improve the heat efficiency of the whole device, the first heat exchanger 21 exchanges heat between the dilute solution output from the second absorber 14 and the concentrated solution flowing back from the first generator 18 to improve the temperature of the dilute solution output from the second absorber 14, and the second heat exchanger 22 exchanges heat between the intermediate concentration solution output from the first generator 18 and the high-temperature high-concentration solution flowing back through the second generator 19 to reduce the temperature of the high-temperature high-concentration solution.
In some embodiments of the invention, the refrigerator further comprises a first concentrated solution pump 23 arranged on the absorbent solution circulation line, said first concentrated solution pump 23 being located on the concentrated solution circuit between the generator and the first absorber 12, and a second concentrated solution pump 24 arranged on the absorbent solution circulation line, said second concentrated solution pump 24 being located between the first absorber 12 and the second absorber 14.
In other embodiments of the invention, the refrigerator further comprises a first solution pump 25 arranged in the absorbent solution circulation line, said first solution pump 25 being located in the line of the second absorber 14 outputting the dilute solution, and said first solution pump 25 being located between the second absorber 14 and said first heat exchanger 21.
The absorbent solution is lithium bromide aqueous solution, the concentration of the lithium bromide aqueous solution is 42-65%, and the refrigerant is water. The concentration of the aqueous lithium bromide in the first absorber 12 is the greatest and the concentration of the aqueous lithium bromide in the second absorber 14 is the smallest when the absorbent solution flows from the first absorber 12 to the second absorber 14.
In some embodiments of the invention, the cooling water input temperature is 40 ℃, the cold water input temperature is 12-16 ℃, and the cold water output temperature is 7 ℃.
In some embodiments of the present invention, the dilute solution output from the second absorber 14 may be branched into two parallel paths and simultaneously enter the first generator 18 and the second generator 19, as shown in fig. 2, the dilute solution output from the second absorber 14 may enter the second generator 19 before entering the first generator 18, as shown in fig. 3, and the dilute solution output from the second absorber 14 may enter only one generator, as shown in fig. 4.
Wherein the second generator heat source may be steam, fuel, hot water, etc.
The working principle is that dilute solution output by the second absorber 14 is conveyed by a first solution pump 25, after the temperature of the first heat exchanger 21 is raised, the dilute solution enters the first generator 18 for heating concentration, part of the intermediate concentration solution is conveyed by a second solution pump 26, after the temperature of the dilute solution is raised by a second heat exchanger 22, the dilute solution enters the second generator 19 for heating concentration, the high-temperature high-concentration solution is cooled by the second heat exchanger 22, and then mixed with the rest part of the intermediate concentration solution from the first generator 18 to form concentrated solution, the concentrated solution is conveyed by a first concentrated solution pump 23, enters the first absorber 12 for absorbing the refrigerant vapor from the first evaporator 11, is cooled by an internal circulating water, and the intermediate concentration solution is conveyed to the second absorber 14 for absorbing the refrigerant vapor from the second evaporator 13 by a second concentrated solution pump 24, enters the first solution pump 25 after being cooled by the cooling water and is recycled.
The refrigerant vapor from the second generator 19 enters the tube side of the first generator 18, heats the absorbent solution in the shell side, condenses into refrigerant water at the same time, enters the condenser 20, the refrigerant vapor generated by the first generator 18 condenses in the condenser 20, is mixed with the refrigerant water from the first generator 18 to enter the second evaporator 13, the refrigerant enters the second evaporator 13 under the transportation of the second refrigerant pump 17 to absorb heat by self-circulation evaporation, and the refrigerant enters the first evaporator 11 under the transportation of the first refrigerant pump 16 to absorb heat by self-circulation evaporation.
Wherein cold water (low temperature heat source water) releases heat and lowers temperature in the tube side of the first evaporator 11. The internal circulation water absorbs heat in the first absorber 12 and increases temperature, releases heat in the second evaporator 13 and decreases temperature, and evaporates the refrigerant in the second evaporator 13. The cooling water (heat supply network water) absorbs heat to raise the temperature in the second absorber 14, and continues to absorb heat to raise the temperature in the condenser 20.
According to the absorbent solution circulation, the solution absorption link is added, so that the circulation concentration and the circulation path are enlarged, the required temperature of heat source water (cold water) can be obviously reduced from about 20 ℃ to about 12 ℃, meanwhile, the refrigerant evaporation link is added, the refrigerant circulation quantity is increased, the required temperature of cooling water can be obviously increased from about 32 ℃ to about 40 ℃ and the application range of the cooling water temperature of a refrigerator is enlarged, and therefore, under the environment of simultaneous heating and cooling, the cooling water at 7 ℃ can be output when the input temperature of low-temperature heat source water is 12 ℃, and meanwhile, the cooling water at 40 ℃ can be supplied, and the cooling water prepared by a cooling tower can be output, so that the energy utilization rate is improved.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other, and it is contemplated that the embodiments may be combined with each other in various combinations or permutations. The scope of the application should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
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| CN101329117A (en) * | 2008-07-23 | 2008-12-24 | 北京环能瑞通科技发展有限公司 | Integral type absorption type heat exchange machine unit |
| CN212299535U (en) * | 2020-04-28 | 2021-01-05 | 松下制冷（大连）有限公司 | An absorption refrigeration unit for producing low-temperature cold water |
| CN214746567U (en) * | 2021-02-04 | 2021-11-16 | 北京华源泰盟节能设备有限公司 | refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102155811A (en) * | 2011-04-30 | 2011-08-17 | 浙江理工大学 | Double-temperature double-effect lithium bromide absorption refrigerating unit |
| CN206247690U (en) * | 2016-11-19 | 2017-06-13 | 双良节能系统股份有限公司 | Two sections of independent superposition type double-effect lithium bromide absorption type refrigerating heat pump units |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329117A (en) * | 2008-07-23 | 2008-12-24 | 北京环能瑞通科技发展有限公司 | Integral type absorption type heat exchange machine unit |
| CN212299535U (en) * | 2020-04-28 | 2021-01-05 | 松下制冷（大连）有限公司 | An absorption refrigeration unit for producing low-temperature cold water |
| CN214746567U (en) * | 2021-02-04 | 2021-11-16 | 北京华源泰盟节能设备有限公司 | refrigerator |
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