CN108413642B - Integrated multi-working-mode lithium bromide refrigerating unit - Google Patents
Integrated multi-working-mode lithium bromide refrigerating unit Download PDFInfo
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- CN108413642B CN108413642B CN201810298449.9A CN201810298449A CN108413642B CN 108413642 B CN108413642 B CN 108413642B CN 201810298449 A CN201810298449 A CN 201810298449A CN 108413642 B CN108413642 B CN 108413642B
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- electromagnetic valve
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- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 title claims abstract description 104
- 239000006096 absorbing agent Substances 0.000 claims abstract description 69
- 238000010521 absorption reaction Methods 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000003507 refrigerant Substances 0.000 claims description 15
- 238000005057 refrigeration Methods 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 3
- 239000002826 coolant Substances 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003245 working effect 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
- F25B49/043—Operating continuously
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses an integrated multi-working-mode lithium bromide refrigerating unit, which comprises a high-pressure generator, a low-pressure generator, a high-pressure absorber, a low-pressure absorber, a high-temperature heat exchanger, a low-temperature heat exchanger, a condenser, an evaporator, a PLC control system and a temperature sensor for detecting the temperature of a heat source. According to the invention, different heat exchangers are combined together as required by adopting a solution pump, a solenoid valve and other fluid control components, and three working modes of a two-stage absorption unit working mode, a single-effect absorption unit working mode, a double-effect absorption unit working mode and the like are integrated; when the temperature of the heat source is 65-85 ℃, the system automatically starts a two-stage absorption type working mode; when the temperature of the heat source is between 85 ℃ and 150 ℃, the system automatically starts a single-effect absorption type working mode; when the temperature of the heat source is above 150 ℃, the system automatically starts the double-effect absorption type working mode. Regardless of the variation in heat source temperature, the system is always in the most efficient operating state.
Description
Technical Field
The invention relates to the technical field of absorption refrigeration, in particular to a lithium bromide refrigerating unit integrating multiple working modes.
Background
The working principle of the heat pump unit is that heat on different heat transfer media is basically transferred mutually, the temperature of the heat transfer media taking away the heat is reduced to become a so-called 'refrigerant', the temperature of the heat transfer media absorbing the heat is increased to become a 'heat medium', and the heat source for supplying heat to the outside is formed. Therefore, the absorption heat pump unit can realize the dual purposes of refrigeration and heating according to whether the output heat transfer medium is a refrigerant or a heating medium. The absorption heat pump unit mainly used for refrigeration is also called an absorption refrigerator, the absorption refrigerator widely used at present mainly uses lithium bromide and ammonia water as working media, the lithium bromide refrigerator is mainly used for an air conditioning system, and the ammonia water refrigerator is mainly used for a refrigerating chamber or a freezing chamber with the temperature below zero.
The lithium bromide refrigerating unit has different types of machine types according to the temperature of the input heat source, and each machine type has a working mode. According to the low-to-high temperature of the heat source, the heat source can be divided into a two-stage absorption unit, a single-effect absorption unit, a double-effect absorption unit, a three-effect absorption unit and the like. All types of lithium bromide refrigeration units commonly used at present can only work in one mode, namely the working mode is not changed even if the temperature of a heat source is changed greatly. The consequences of this disadvantage are:
(1) When the actual heat source temperature is lower than the design value, the refrigerating performance of the unit is greatly reduced, and if the actual heat source temperature is too lower than the design value, the refrigerating function of the unit is lost.
(2) When the actual heat source temperature is higher than the design value, the refrigerating performance of the unit is not reduced, but the refrigerating performance of the unit is not increased, precious high-grade heat sources are wasted, and the high-temperature and high-efficiency design purpose is not achieved.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides an integrated multi-working-mode lithium bromide refrigerating unit, which can integrate a two-stage absorption unit working mode, a single-effect absorption unit working mode and a double-effect absorption unit working mode, and always enables the system to be in the most efficient working state no matter how the temperature of a heat source changes.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides an integrated many mode's lithium bromide refrigerating unit, includes high pressure generator, low pressure generator, high pressure absorber, low pressure absorber, high temperature heat exchanger, low temperature heat exchanger, condenser and evaporimeter:
The steam outlet of the high-pressure generator is connected with the refrigerant water inlet of the condenser through a first steam electromagnetic valve and a steam coil pipe arranged in the low-pressure generator, and the steam outlet of the high-pressure generator is also connected with the steam inlet of the condenser through a second steam electromagnetic valve; the solution outlet of the high-pressure generator is connected with the solution inlet of the low-pressure absorber through the high-temperature heat exchanger; the solution outlet of the high-pressure generator is also connected with the solution inlet of the high-pressure absorber through the high-temperature heat exchanger and the first solution electromagnetic valve;
The steam outlet of the low-pressure generator is connected with the steam inlet of the high-pressure absorber through a third steam electromagnetic valve, and the steam outlet of the low-pressure generator is also connected with the steam inlet of the condenser through a fourth steam electromagnetic valve; the solution outlet of the low-pressure generator is connected with the solution inlet of the low-pressure absorber through a second solution electromagnetic valve and a low-temperature heat exchanger;
The solution outlet of the high-pressure absorber is connected with the solution inlet of the high-pressure generator through a third solution electromagnetic valve and a high-temperature heat exchanger; the solution outlet of the low-pressure absorber is connected with the solution inlet of the high-pressure generator through the high-temperature heat exchanger, and the solution outlet of the low-pressure absorber is also connected with the solution inlet of the low-pressure generator through a fourth solution electromagnetic valve and the low-temperature heat exchanger;
The refrigerant water outlet of the condenser is connected with the refrigerant water inlet of the evaporator, and the steam outlet of the evaporator is connected with the steam inlet of the low-pressure absorber;
The lithium bromide refrigerator further comprises a PLC control system and a temperature sensor for detecting the temperature of a heat source, wherein the PLC control system controls the opening and closing of the first steam electromagnetic valve, the second steam electromagnetic valve, the third steam electromagnetic valve, the fourth steam electromagnetic valve, the first solution electromagnetic valve, the second solution electromagnetic valve, the third solution electromagnetic valve and the fourth solution electromagnetic valve according to the temperature of the heat source detected by the temperature sensor, so that the lithium bromide refrigerator set respectively works in a two-stage absorption type working mode, a single-effect absorption type working mode and a double-effect absorption type working mode.
The two-stage absorption type working mode is as follows: the temperature of the heat source is 65-85 ℃; the heat source enters the high-pressure generator and the low-pressure generator at the same time; the first steam electromagnetic valve and the fourth steam electromagnetic valve are closed, the second steam electromagnetic valve and the third steam electromagnetic valve are opened, and the first solution electromagnetic valve, the second solution electromagnetic valve, the third solution electromagnetic valve and the fourth solution electromagnetic valve are opened.
The single-effect absorption type working mode is as follows: the temperature of the heat source is 85-150 ℃; the heat source only enters the high-pressure generator; the first steam electromagnetic valve, the third steam electromagnetic valve and the fourth steam electromagnetic valve are closed, and the second steam electromagnetic valve is opened; the first solution electromagnetic valve, the second solution electromagnetic valve, the third solution electromagnetic valve and the fourth solution electromagnetic valve are closed; the low pressure generator and the high pressure absorber are not operated.
The double-effect absorption type working mode is as follows: the temperature of the heat source is more than 150 ℃; the heat source only enters the high-pressure generator; the first steam electromagnetic valve and the fourth steam electromagnetic valve are opened, and the second steam electromagnetic valve and the third steam electromagnetic valve are closed; the first solution electromagnetic valve and the third solution electromagnetic valve are closed, and the second solution electromagnetic valve and the fourth solution electromagnetic valve are opened; the high pressure absorber is not operating.
As an improvement of the invention, the evaporator and the low-pressure absorber are arranged in the same pressure cylinder, the middle is separated by a shutter, and a baffle plate is arranged at the lower part of the shutter. The shutter serves to block lithium bromide solution droplets from entering the evaporator from the low pressure absorber, but water vapor from the evaporator may enter the low pressure absorber. The function of the separator is to separate the coolant water in the lower part of the evaporator from the lithium bromide solution in the lower part of the low pressure absorber.
Compared with the prior art, the invention has the beneficial effects that:
1. the temperature range of a heat source which can be utilized by a single lithium bromide refrigerating unit is enlarged, and the application scene is increased.
2. Under the condition of slightly increasing the manufacturing cost of a single unit, the working effect of a plurality of different types of units is equivalent to that obtained.
3. According to the temperature of the heat source, the working mode is automatically switched, and the heat and the flow of the heat source are efficiently utilized.
Drawings
Fig. 1 is a schematic diagram of an integrated multi-mode lithium bromide refrigeration unit of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and more obvious, the present invention will be further described in detail below with reference to the accompanying drawings and examples. The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Examples:
As shown in fig. 1, a lithium bromide refrigeration unit integrating multiple operation modes comprises a high-pressure generator 23, a low-pressure generator 2, a high-pressure absorber 4, a low-pressure absorber 15, a high-temperature heat exchanger 21, a low-temperature heat exchanger 17, a condenser 8, an evaporator 10, a PLC control system and a temperature sensor for detecting the temperature of a heat source.
The high pressure generator 23 has a heat source coil with a solution outlet conduit that is fitted with a solution pump 22. The low pressure generator 2 has a steam coil and a heat source coil with a solution outlet conduit that is fitted with a solution pump 16. The high pressure absorber 4, condenser 8 and low pressure absorber 15 have cooling water coils, the solution outlet pipe of the high pressure absorber 4 is fitted with a solution pump 6, and the solution outlet pipe of the low pressure absorber 15 is fitted with a solution pump 14. The evaporator 10 has a chilled water coil, and the evaporator 10 is further provided with a refrigerant water circulation shower circuit constituted by a circulation pump 11 and pipes. The evaporator 10 and the low pressure absorber 15 are arranged in the same pressure cylinder, the middle is separated by a shutter 13, and the lower part of the shutter is a baffle 12. The shutter 13 functions to block lithium bromide solution droplets from entering the evaporator 10 from the low pressure absorber 15, but water vapor of the evaporator 10 may enter the low pressure absorber 15. The separator 12 serves to separate the coolant water at the lower portion of the evaporator 10 from the lithium bromide solution at the lower portion of the low pressure absorber 15. The high temperature heat exchanger 21 and the low temperature heat exchanger 17 are used for heat exchange between the lithium bromide concentrated solution and the lithium bromide dilute solution. All parts are communicated through pipelines, valves and pumps are arranged on the pipelines, the refrigeration principle of the lithium bromide refrigeration unit is basic knowledge of relevant disciplines, and the constitution and principle of all parts are not repeated here.
The high-pressure generator 23 has two steam outlets, one is connected with the cold water inlet of the condenser 8 through a first steam electromagnetic valve 25 and a steam coil arranged in the low-pressure generator 2, and the other is connected with the steam inlet of the condenser 8 through a second steam electromagnetic valve 24. The low-pressure generator 2 has two steam outlets, one is connected with the steam inlet of the high-pressure absorber 4 through a third steam electromagnetic valve 3, and the other is connected with the steam inlet of the condenser 8 through a fourth steam electromagnetic valve 5. The refrigerant water outlet of the condenser 8 is connected to the refrigerant water inlet of the evaporator 10, and the vapor generated by the evaporator 10 enters the low pressure absorber 15 through the louver 13.
The solution outlet of the high-pressure generator 23 is divided into two paths after passing through the high-temperature heat exchanger 21, one path is always provided with the solution solenoid valve 20 to be connected with the solution inlet of the low-pressure absorber 15, and the other path is connected with the solution inlet of the high-pressure absorber 4 through the first solution solenoid valve 9. The solution outlet of the low-pressure generator 2 is connected with the solution inlet of the low-pressure absorber 15 through the second solution electromagnetic valve 1 and the low-temperature heat exchanger 17. The solution outlet of the high-pressure absorber 4 is connected with the solution inlet of the high-pressure generator 23 through the third solution electromagnetic valve 6 and the high-temperature heat exchanger 21. The solution outlet of the low-pressure absorber 15 is divided into two paths, one path is often provided with a solution solenoid valve 19, the high-temperature heat exchanger 21 is connected with the solution inlet of the high-pressure generator 23, and the other path is connected with the solution inlet of the low-pressure generator 2 through a fourth solution solenoid valve 18 and the low-temperature heat exchanger 17.
The PLC control system controls the opening and closing of the first steam electromagnetic valve 25, the second steam electromagnetic valve 24, the third steam electromagnetic valve 3, the fourth steam electromagnetic valve 5, the first solution electromagnetic valve 9, the second solution electromagnetic valve 1, the third solution electromagnetic valve 6 and the fourth solution electromagnetic valve 18 according to the heat source temperature detected by the temperature sensor, so that the lithium bromide refrigeration unit respectively works in a two-stage absorption type working mode, a single-effect absorption type working mode and a double-effect absorption type working mode.
The working flow of the lithium bromide refrigerating unit of the invention is as follows:
Before the heat source fluid enters the high pressure generator 23, the temperature sensor will measure the heat source temperature and determine which mode of operation the system should start based on the temperature value.
1. When the temperature of the heat source is 65-85 ℃, the system automatically starts a two-stage absorption type working mode.
The heat source enters the high-pressure generator 23 and the low-pressure generator 2 at the same time, the first steam electromagnetic valve 25 and the fourth steam electromagnetic valve 5 are closed, the second steam electromagnetic valve 24 and the third steam electromagnetic valve 3 are opened, and the first solution electromagnetic valve 9, the second solution electromagnetic valve 1, the third solution electromagnetic valve 6 and the fourth solution electromagnetic valve 18 are opened. At this time, all the water vapor generated by the high-pressure generator 23 enters the condenser 8 to be cooled into coolant water, and all the water vapor generated by the low-pressure generator 2 enters the high-pressure absorber 4 to be absorbed by the lithium bromide concentrated solution, and the lithium bromide concentrated solution also becomes a lithium bromide dilute solution. The refrigerant water flows out of the condenser 8, enters the evaporator 10, is changed into water vapor after spray evaporation, enters the low-pressure absorber 15, and is changed into lithium bromide dilute solution after the lithium bromide concentrated solution absorbs the water vapor. The lithium bromide dilute solution of the high-pressure absorber 4 flows through the high-temperature heat exchanger 21 and then enters the high-pressure generator 23, the lithium bromide dilute solution of the low-pressure absorber 15 flows through the high-temperature heat exchanger 21 and then enters the high-pressure generator 23, and the lithium bromide dilute solution of the low-pressure absorber 15 flows through the low-temperature heat exchanger 17 and then enters the low-pressure generator 2. After passing through the high-temperature heat exchanger 21, a part of lithium bromide concentrated solution generated by the high-pressure generator 23 returns to the low-pressure absorber 15, and a part of lithium bromide concentrated solution generated by the low-pressure generator 2 returns to the high-pressure absorber 4 after passing through the low-temperature heat exchanger 17, and then returns to the low-pressure absorber 15. The circulating flow of the lithium bromide solution and the circulating flow of the refrigerant water (including the water vapor) in the two-stage absorption type working mode are the same as those of the common two-stage absorption type unit.
2. When the temperature of the heat source is 85-150 ℃, the system automatically starts a single-effect absorption type working mode.
The heat source only enters the high-pressure generator 23, no longer enters the low-pressure generator 2, nor does the cooling water enter the high-pressure absorber 4. The first steam solenoid valve 25, the third steam solenoid valve 3 and the fourth steam solenoid valve 5 are closed, and the second steam solenoid valve 24 is opened. The first solution solenoid valve 9, the second solution solenoid valve 1, the third solution solenoid valve 6 and the fourth solution solenoid valve 18 are closed. The above operation makes the low pressure generator 2 and the high pressure absorber 4 no longer operate, and only the high pressure generator 23, the condenser 8, the low pressure absorber 15 and the evaporator 10 normally operate when the system is operated. At this time, all the water vapor generated by the high-pressure generator 23 enters the condenser 8 and is cooled to be refrigerant water, the refrigerant water flows out of the condenser 8, enters the evaporator 10, is changed into water vapor after spray evaporation, enters the low-pressure absorber 15, and the lithium bromide concentrated solution is changed into a lithium bromide dilute solution after absorbing the water vapor. The lithium bromide dilute solution flows out of the low-pressure absorber 15, flows through the high-temperature heat exchanger 21 and then enters the high-pressure generator 23, and the lithium bromide concentrated solution generated by the high-pressure generator 23 flows through the high-temperature heat exchanger 21 and then returns to the low-pressure absorber 15. The circulating flow of lithium bromide solution and the circulating flow of coolant water (including when the coolant water becomes water vapor) in the single-effect absorption type working mode are the same as those of a common single-effect absorption type unit.
3. When the temperature of the heat source is above 150 ℃, the system automatically starts the double-effect absorption type working mode.
The heat source only enters the high-pressure generator 23, no longer enters the low-pressure generator 2, nor does the cooling water enter the high-pressure absorber 4. The first steam solenoid valve 25 and the fourth steam solenoid valve 5 are opened, and the second steam solenoid valve 24 and the third steam solenoid valve 3 are closed. The first solution solenoid valve 9 and the third solution solenoid valve 6 are closed, and the second solution solenoid valve 1 and the fourth solution solenoid valve 18 are opened. The above operation makes the high pressure absorber 4 no longer operate, and only the high pressure generator 23, the low pressure generator 2, the condenser 8, the low pressure absorber 15 and the evaporator 10 normally operate when the system is operated. At this time, all the steam generated by the high-pressure generator 23 enters the steam coil of the low-pressure generator 2 as a heat source of the low-pressure generator 2. All the steam generated by the low-pressure generator 2 enters the condenser 8 to be cooled into the coolant water, and the steam serving as the heat source of the low-pressure generator 2 loses part of heat and becomes the coolant water to enter the condenser 8. The refrigerant water flows out of the condenser 8, enters the evaporator 10, is changed into water vapor after spray evaporation, enters the low-pressure absorber 15, and is changed into lithium bromide dilute solution after the lithium bromide concentrated solution absorbs the water vapor. The lithium bromide dilute solution flows out of the low-pressure absorber 15, part flows through the high-temperature heat exchanger 21 and then enters the high-pressure generator 23, and part flows through the low-temperature heat exchanger 17 and then enters the low-pressure generator 2. The lithium bromide concentrated solution generated by the high-pressure generator 23 flows through the high-temperature heat exchanger 21 and then returns to the low-pressure absorber 15, and the lithium bromide concentrated solution generated by the low-pressure generator 2 flows through the low-temperature heat exchanger 17 and then returns to the low-pressure absorber 15. The above is the circulation flow of lithium bromide solution and the circulation flow of coolant water (including when the coolant water is changed into water vapor) in the double-effect absorption type working mode, which is the same as the common double-effect absorption type unit.
The lithium bromide refrigerating unit adopts the fluid control components such as the solution pump, the electromagnetic valve and the like to combine different heat exchangers according to the needs, and integrates the two-stage absorption unit working mode, the single-effect absorption unit working mode, the double-effect absorption unit working mode and the like. When the temperature of the heat source is 65-85 ℃, the system automatically starts a two-stage absorption type working mode; when the temperature of the heat source is between 85 ℃ and 150 ℃, the system automatically starts a single-effect absorption type working mode; when the temperature of the heat source is above 150 ℃, the system automatically starts the double-effect absorption type working mode. Regardless of the variation in heat source temperature, the system is always in the most efficient operating state.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. The utility model provides an integrated many mode's lithium bromide refrigerating unit, includes high pressure generator (23), low pressure generator (2), high pressure absorber (4), low pressure absorber (15), high temperature heat exchanger (21), low temperature heat exchanger (17), condenser (8) and evaporimeter (10), its characterized in that:
the steam outlet of the high-pressure generator (23) is connected with the cold water inlet of the condenser (8) through a first steam electromagnetic valve (25) and a steam coil pipe arranged in the low-pressure generator (2), and the steam outlet of the high-pressure generator (23) is also connected with the steam inlet of the condenser (8) through a second steam electromagnetic valve (24); the solution outlet of the high-pressure generator (23) is connected with the solution inlet of the low-pressure absorber (15) through the high-temperature heat exchanger (21); the solution outlet of the high-pressure generator (23) is also connected with the solution inlet of the high-pressure absorber (4) through the high-temperature heat exchanger (21) and the first solution electromagnetic valve (9);
The steam outlet of the low-pressure generator (2) is connected with the steam inlet of the high-pressure absorber (4) through a third steam electromagnetic valve (3), and the steam outlet of the low-pressure generator (2) is also connected with the steam inlet of the condenser (8) through a fourth steam electromagnetic valve (5); the solution outlet of the low-pressure generator (2) is connected with the solution inlet of the low-pressure absorber (15) through a second solution electromagnetic valve (1) and a low-temperature heat exchanger (17);
The solution outlet of the high-pressure absorber (4) is connected with the solution inlet of the high-pressure generator (23) through a third solution electromagnetic valve (6) and a high-temperature heat exchanger (21); the solution outlet of the low-pressure absorber (15) is connected with the solution inlet of the high-pressure generator (23) through the high-temperature heat exchanger (21), and the solution outlet of the low-pressure absorber (15) is also connected with the solution inlet of the low-pressure generator (2) through the fourth solution solenoid valve (18) and the low-temperature heat exchanger (17);
the refrigerant water outlet of the condenser (8) is connected with the refrigerant water inlet of the evaporator (10), and the steam outlet of the evaporator (10) is connected with the steam inlet of the low-pressure absorber (15);
the lithium bromide refrigerator further comprises a PLC control system and a temperature sensor for detecting the temperature of a heat source, wherein the PLC control system controls the opening and closing of a first steam electromagnetic valve (25), a second steam electromagnetic valve (24), a third steam electromagnetic valve (3), a fourth steam electromagnetic valve (5), a first solution electromagnetic valve (9), a second solution electromagnetic valve (1), a third solution electromagnetic valve (6) and a fourth solution electromagnetic valve (18) according to the temperature of the heat source detected by the temperature sensor, so that the lithium bromide refrigerator set respectively works in a two-stage absorption type working mode, a single-effect absorption type working mode and a double-effect absorption type working mode;
The two-stage absorption type working mode is as follows: the temperature of the heat source is 65-85 ℃; the heat source enters the high-pressure generator (23) and the low-pressure generator (2) at the same time; the first steam electromagnetic valve (25) and the fourth steam electromagnetic valve (5) are closed, the second steam electromagnetic valve (24) and the third steam electromagnetic valve (3) are opened, and the first solution electromagnetic valve (9), the second solution electromagnetic valve (1), the third solution electromagnetic valve (6) and the fourth solution electromagnetic valve (18) are opened;
the double-effect absorption type working mode is as follows: the temperature of the heat source is more than 150 ℃; the heat source only enters the high-pressure generator (23); the first steam electromagnetic valve (25) and the fourth steam electromagnetic valve (5) are opened, and the second steam electromagnetic valve (24) and the third steam electromagnetic valve (3) are closed; the first solution electromagnetic valve (9) and the third solution electromagnetic valve (6) are closed, and the second solution electromagnetic valve (1) and the fourth solution electromagnetic valve (18) are opened; the high-pressure absorber (4) is not operated.
2. The integrated multi-mode lithium bromide refrigeration unit of claim 1, wherein the single-effect absorption mode of operation is: the temperature of the heat source is 85-150 ℃; the heat source only enters the high-pressure generator (23); the first steam electromagnetic valve (25), the third steam electromagnetic valve (3) and the fourth steam electromagnetic valve (5) are closed, and the second steam electromagnetic valve (24) is opened; the first solution electromagnetic valve (9), the second solution electromagnetic valve (1), the third solution electromagnetic valve (6) and the fourth solution electromagnetic valve (18) are closed; the low-pressure generator (2) and the high-pressure absorber (4) are not operated.
3. The integrated multi-mode lithium bromide refrigeration unit of claim 1, wherein the evaporator (10) and the low pressure absorber (15) are disposed in the same pressure cylinder, separated by a louver (13) in the middle, and a partition (12) is disposed below the louver (13).
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| CN201810298449.9A CN108413642B (en) | 2018-04-03 | 2018-04-03 | Integrated multi-working-mode lithium bromide refrigerating unit |
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| CN201810298449.9A CN108413642B (en) | 2018-04-03 | 2018-04-03 | Integrated multi-working-mode lithium bromide refrigerating unit |
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| CN108413642B true CN108413642B (en) | 2024-04-26 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19538383A1 (en) * | 1995-10-14 | 1997-04-17 | Gea Luftkuehler Happel Gmbh | System for controlling cold absorption unit for air chilling units |
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| CN208108537U (en) * | 2018-04-03 | 2018-11-16 | 中国科学院广州能源研究所 | A kind of BrLi chiller of integrated multi-operation mode |
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| DE19538383A1 (en) * | 1995-10-14 | 1997-04-17 | Gea Luftkuehler Happel Gmbh | System for controlling cold absorption unit for air chilling units |
| CN1804510A (en) * | 2006-01-23 | 2006-07-19 | 李华玉 | Single-double effect absorption type heat pump system |
| CN101000179A (en) * | 2006-12-31 | 2007-07-18 | 李华玉 | Two-stage and multi-stage absorption refrigeration machine |
| CN201706772U (en) * | 2010-06-29 | 2011-01-12 | 东华大学 | Solar single/double effect lithium bromide absorption type refrigerating unit formed by effective heat exchanger |
| CN102155811A (en) * | 2011-04-30 | 2011-08-17 | 浙江理工大学 | Double-temperature double-effect lithium bromide absorption refrigerating unit |
| CN103438605A (en) * | 2013-08-01 | 2013-12-11 | 上海交通大学 | Absorption generation heat-exchange absorptive refrigeration circulation |
| CN105650929A (en) * | 2016-03-01 | 2016-06-08 | 双良节能系统股份有限公司 | Two-section type smoke hot water type lithium bromide absorption type refrigerating unit with smoke heat exchanger |
| CN208108537U (en) * | 2018-04-03 | 2018-11-16 | 中国科学院广州能源研究所 | A kind of BrLi chiller of integrated multi-operation mode |
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|---|---|
| CN108413642A (en) | 2018-08-17 |
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