CN112283982A - Evaporation type absorber and absorption type refrigerating system thereof - Google Patents
Evaporation type absorber and absorption type refrigerating system thereof Download PDFInfo
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- CN112283982A CN112283982A CN202011072756.9A CN202011072756A CN112283982A CN 112283982 A CN112283982 A CN 112283982A CN 202011072756 A CN202011072756 A CN 202011072756A CN 112283982 A CN112283982 A CN 112283982A
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- flat plate
- absorber
- heat exchange
- pipeline
- shell
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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
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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
- F25B15/04—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being ammonia evaporated from aqueous solution
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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
Abstract
The invention discloses an evaporative absorber in the technical field of absorption type circulation, which comprises a shell, a fan and a plurality of absorbers, wherein each absorber comprises a first flat plate, a second flat plate, a feeding hole, an air inlet and a discharging hole, the feeding hole is higher than the first flat plate, the first flat plate is higher than the second flat plate, the second flat plate is higher than the air inlet and the discharging hole, a ventilation channel is arranged between the first flat plate and the second flat plate, the fan is arranged on the side surface of each absorber, the absorber is optimized and modified, the problem of heat loss caused by indirect heat exchange of original circulating water is avoided, the circulating power of the circulating water is greatly reduced, energy is saved, the device can be used for replacing the absorber and a cooling tower in the existing absorption type refrigerating system, the manufacturing cost of equipment is saved, the integration level of the equipment is improved, the side wall structure of a corrugated heat exchange tube is combined, the time for the lean solution to absorb the gaseous refrigerant is increased, and the absorption effect is improved.
Description
Technical Field
The invention relates to the technical field of absorption type circulation, in particular to an evaporative absorber and an absorption type refrigerating system thereof.
Background
The waste heat refrigeration is a technology for driving a compression type or absorption type refrigerator to refrigerate by using gas or waste gas and waste liquid in the production process and heat exhausted by some power machines as energy sources. Waste heat refrigeration can help people to recover waste heat, energy consumption is saved, and cost is reduced.
Conventional compression refrigeration is a conversion process of electrical energy. The compressor sucks the low-pressure and low-temperature refrigerant gas (such as Freon) generated in the evaporator into the cylinder, and compresses the refrigerant gas into gas with higher pressure and temperature, and the gas is discharged into the condenser. Condensing into liquid, throttling and reducing pressure by a pressure regulating valve, and then entering the evaporator, wherein the low-pressure refrigerant gas is vaporized to absorb heat in the evaporator to reduce the temperature. This is the chilled water of the air conditioner that we need. The compression process requires a large consumption of electrical energy.
In order to save energy, the publication CN201721774033.7 discloses an industrial waste heat driven absorption type deep refrigeration system, in which industrial waste heat can be effectively utilized to achieve energy recycling. However, as is well known, a cooling tower is generally arranged in a device matched with the system for use, when cooling water in a traditional absorber is used, a circulating pump is needed for driving and circulating, a certain amount of electric quantity loss can be generated, and when heat is exchanged, the cooling water is needed to take away heat firstly, and then the cooling tower is used for cooling, so that the heat exchange stroke is long, and the heat exchange efficiency is reduced. In order to solve the problems, the application combines the new process design of the prior art to provide an evaporative absorber and an absorption refrigeration system thereof.
Disclosure of Invention
The present invention is directed to an evaporative absorber and an absorption refrigeration system thereof, which solve the problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: an evaporative absorber comprises a shell, a fan and a plurality of absorbers, wherein each absorber comprises a first flat plate, a second flat plate, a feeding port, an air inlet and a discharging port, the feeding port is higher than the first flat plate, the first flat plate is higher than the second flat plate, the second flat plate is higher than the air inlet and the discharging port, a ventilation channel is arranged between the first flat plate and the second flat plate, and the fan is arranged on the side face of the absorber.
Preferably, a third flat plate is further arranged between the first flat plate and the second flat plate, a heat exchange element is mounted on the third flat plate, a gap is formed between the third flat plate and the heat exchange element, and a water inlet is formed in a shell between the first flat plate and the third flat plate.
Preferably, the shell is provided with a water outlet, the water outlet is higher than the second flat plate, the water outlet is connected with the water inlet through a pipeline, the pipeline is provided with a circulating pump, and the upper end of the heat exchange element is higher than the first flat plate by a certain height and is uniformly distributed at the same height.
Preferably, the ventilation channel comprises air holes formed in the shell, liquid stabilizing rings are fixedly connected to the first flat plate and the third flat plate, the heat exchange elements are corrugated heat exchange tubes, sleeves corresponding to the heat exchange elements are installed on the third flat plate, an upper fixing rod is fixedly connected to the lower end face of the second partition plate, a filler is fixedly connected to the upper fixing rod, and the lower end of the filler is fixedly connected to the upper end face of the third partition plate through the lower fixing rod.
Preferably, the inner side wall of the housing is fixedly connected with two rows of symmetrically arranged drainage plates, and the inner side wall of the housing is fixedly connected with a water collector.
Preferably, the lower opening of the sleeve is of an annular chamfered edge structure.
Preferably, the liquid stabilizing ring is of a hollow cylindrical structure, an inner liquid distributor is installed at the top end of the corrugated heat exchange tube, and a liquid level meter is installed on the lower side of the air inlet.
Compared with the prior art, the invention has the beneficial effects that:
1. through setting up shell and absorber isotructure, optimize the transformation to the absorber, avoided the calorific loss problem that the indirect heat transfer of former circulating water leads to, greatly reduced the circulation power of circulating water, the energy saving uses the device can replace two devices of absorber and cooling tower among the current absorption refrigeration system, has saved equipment manufacturing cost, has improved equipment integration level.
2. Through setting up structures such as ripple type heat exchange tube, feed inlet and air inlet for poor solution flows to the below from the top under the action of gravity from the inside of ripple type heat exchange tube, and gaseous state refrigerant rises to the top from the below from the inside of ripple type heat exchange tube, and the lateral wall structure of reunion ripple type heat exchange tube slows down the decurrent velocity of flow of poor solution, increases the time that poor solution absorbs gaseous state refrigerant, has promoted the absorption effect.
3. Through setting up stabilizator ring and sleeve isotructure, make the poor solution flow down from a plurality of corrugated heat exchange tubes simultaneously on the one hand, on the other hand makes the circulating water can be followed the space between corrugated heat exchange tube and the sleeve simultaneously and left, has ensured the stability of heat transfer process.
4. Through setting up air vent, filler and drainage plate isotructure, can utilize the air and the water of inspiration to carry out the heat transfer in step with poor solution through corrugated heat exchange tube on the one hand, promoted heat exchange efficiency, on the other hand makes the water of receiving water ware recovery circulate along drainage plate reentrant, further promotes heat exchange efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is an enlarged view of the structure A of the present invention;
FIG. 3 is a schematic diagram of the system architecture and process of the present invention;
FIG. 4 is a schematic view of the internal liquid distributor mounting structure of the present invention;
FIG. 5 is a schematic top view of the internal liquid distributor of the present invention;
fig. 6 is a schematic structural view of a corrugated heat exchange tube according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
the device comprises a shell-1, a feed inlet-2, an air inlet-3, a discharge outlet-4, a water outlet-5, a circulating pump-6, a circulating pipe-7, a first plate-8, a liquid stabilizing ring-9, a heat exchange element-10, a sleeve-11, a second plate-12, a third plate-13, a lower fixing rod-14, a filler-15, an upper fixing rod-16, a drainage plate-17, a water inlet-18, a fan-19, a water collector-20 and an inner liquid distributing device-21.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: an evaporative absorber comprises a shell 1, a fan 19 and a plurality of absorbers, wherein the absorber comprises a first flat plate 8, a second flat plate 12, a feed inlet 2, an air inlet 3 and a discharge port 4, the feed inlet 2 is higher than the first flat plate 8, the first flat plate 8 is higher than the second flat plate 12, the second flat plate 12 is higher than the air inlet 3 and the discharge port 4, a ventilation channel is arranged between the first flat plate 8 and the second flat plate 12, the fan 19 is arranged on the side surface of the absorber, the absorber is optimized and modified by arranging the shell, the absorber and other structures, the problem of heat loss caused by indirect heat exchange of original circulating water is avoided, the circulating power of the circulating water is greatly reduced, energy is saved, the device can be used for replacing two devices, namely the absorber and a cooling tower in the existing absorption refrigeration system, the manufacturing cost of equipment is saved, and.
A third flat plate 13 is also arranged between the first flat plate 8 and the second flat plate 12, a heat exchange element 10 is arranged on the third flat plate 13, a gap is reserved between the third flat plate 13 and the heat exchange element 10, a water inlet 18 is arranged on the shell 1 between the first flat plate 8 and the third flat plate 12, a water outlet 5 is arranged on the shell, the position of the water outlet 5 is higher than that of the second flat plate 12, the water outlet 5 is connected with the water inlet 18 through a pipeline 7, a circulating pump 6 is arranged on the pipeline 7, the upper end of the heat exchange element 10 is higher than the first flat plate 8 by a certain height and, this structure allows the lean solution to flow from above to below from the inside of the corrugated type heat exchange tube under the action of gravity, the gaseous refrigerant rises from the lower part to the upper part from the inside of the corrugated heat exchange tube, and the side wall structure of the corrugated heat exchange tube is combined, so that the downward flow velocity of the lean solution is slowed down, the time for the lean solution to absorb the gaseous refrigerant is prolonged, and the absorption effect is improved.
The ventilation channel is including seting up the air vent on shell 1, equal fixedly connected with steady liquid circle 9 on first dull and stereotyped 8 and the third flat board 13, heat exchange element 10 is ripple type heat exchange tube, install the sleeve 11 that corresponds with heat exchange element 10 on the third flat board 13, the lower terminal surface fixedly connected with of second baffle 12 goes up dead lever 16, go up dead lever 16 fixedly connected with filler 15, the lower extreme of filler 15 passes through the up end fixed connection of lower dead lever 14 with third baffle 13, this structure makes the poor solution can flow down from a plurality of ripple type heat exchange tubes simultaneously on the one hand, on the other hand makes the circulating water can be followed the space between ripple type heat exchange tube and the sleeve 11 simultaneously and is left, the stability of heat transfer process has been ensured.
Two rows of drainage plates 17 that the symmetry set up of shell 1's inside wall fixedly connected with, the inside wall fixedly connected with of shell 1 receives hydrophone 20, the lower extreme opening part of sleeve 11 is annular oblique edging structure, steady liquid circle 9 is the cavity cylinder structure, interior liquid distributor 21 is installed on the top of ripple type heat exchange tube, the level gauge is installed to the downside of air inlet 3, this structure can utilize the air and water of inspiration to carry out the heat transfer in step with poor solution through heat exchange tube 10 on the one hand, heat exchange efficiency has been promoted, on the other hand makes the water of receiving 22 receipts hydrophone recycles along drainage plates 17 entering once more, further promote heat exchange efficiency.
An absorption refrigeration system, including generator, condenser, evaporator, relief pressure valve, circulating pump, choke valve, also include the evaporative absorber as in any claim 1-7, connect with lean solution pipeline and rich solution pipeline between evaporative absorber and the generator, connect with the gaseous refrigerant pipeline of high pressure between generator and the condenser, connect with the high-pressure liquid refrigerant pipeline between condenser and the evaporator, connect with the gaseous refrigerant pipeline of low pressure between evaporator and the evaporative absorber, install the choke valve on the lean solution pipeline, install the circulating pump on the rich solution pipeline, install the relief pressure valve on the high-pressure liquid refrigerant pipeline, the lean solution pipeline is connected with feed inlet 2 through, the rich solution pipeline is connected with 4 through of discharge ports, the gaseous refrigerant pipeline of low pressure is connected with 3 through air intakes.
With the combination of the embodiment, the operation flow of the process is as follows: referring to fig. 1 and 3, the process combines a cooling tower and an absorber to reduce the circulation of cooling water and the operation of a water pump, wherein the lean solution and the rich solution can be a lean ammonia solution and a rich ammonia solution, and the gaseous refrigerant is ammonia gas.
When in operation, the circulating pump 6 and the fan 19 are started simultaneously, when the circulating pump 6 is in operation, the cooling water firstly passes through the liquid stabilizing ring 9 on the third flat plate 13, then passes through the gap between the heat exchange element 10 and the sleeve 11, then flows downwards along the outer side wall of the heat exchange element 10, part of the water flow falls on the filler 15, because of the operation of the fan 19, the water flow can fully exchange heat with the air pumped in through the vent holes on the filler 15, then falls on the third partition plate 13, passes through the water outlet 5, the circulating pump 6 and the circulating pipe 7, and finally enters the inner side of the absorber again, meanwhile, the ammonia-poor solution in the system enters the absorber shell 1 through the feed inlet 2, gradually overflows the liquid stabilizing ring 9 on the first flat plate 8, then passes through the inner side of the heat exchange element 10, the ammonia gas in the system enters the absorber through the air inlet 3 and upwards along the inner side wall of the heat exchange element, the poor ammonia solution is absorbed by the flowing-down poor ammonia solution, the poor ammonia solution exchanges heat with cooling water on the outer side through the heat exchange elements 10, the poor ammonia solution after absorbing ammonia gas is converted into an ammonia-rich solution to flow out of the discharge hole 4, the existence of the liquid stabilizing ring 9 can ensure that the flow velocity of the poor ammonia solution in each heat exchange element 10 is uniform, and the flow velocity of the cooling water outside each heat exchange element 10 is also uniform.
The rich ammonia solution that flows out gets into the system, is thrown into the generator by the circulating pump, decomposes into ammonia and poor ammonia solution under the effect of heat source, and the ammonia gets into the condenser, and poor ammonia solution gets into this device through the throttle valve once more and circulates, and the ammonia through the condenser gets into the evaporimeter after being decompressed by the relief pressure valve, then gets into this device once more and circulates, accomplishes the process of whole circulation.
In the process, water drops pumped away by the fan 19 are intercepted by the water collector 20, then drop on the two rows of drainage plates 17, finally flow down to enter circulation, and the heat exchange efficiency is improved.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. An evaporative absorber comprising a housing (1), a fan (19) and a plurality of absorbers, characterised in that: the absorber comprises a first flat plate (8), a second flat plate (12), a feed inlet (2), an air inlet (3) and a discharge port (4), the feed inlet (2) is higher than the first flat plate (8), the first flat plate (8) is higher than the second flat plate (12), the second flat plate (12) is higher than the air inlet (3) and the discharge port (4), a ventilation channel is arranged between the first flat plate (8) and the second flat plate (12), and a fan (19) is arranged on the side face of the absorber.
2. An evaporative absorber as claimed in claim 1, wherein: still be equipped with third flat board (13) between first flat board (8) and second flat board (12), heat transfer element (10) are installed to third flat board (13), third flat board (13) and heat transfer element (10) are gapped, are equipped with water inlet (18) on shell (1) between first flat board (8) and third flat board (12).
3. An evaporative absorber as claimed in claim 2, wherein: the shell is provided with a water outlet (5), the position of the water outlet (5) is higher than that of the second flat plate (12), the water outlet (5) is connected with the water inlet (18) through a pipeline (7), the pipeline (7) is provided with a circulating pump (6), and the upper end of the heat exchange element (10) is higher than the first flat plate (8) by a certain height and is uniformly distributed at the same height.
4. An evaporative absorber as claimed in claim 3, wherein: the ventilation channel comprises air vents arranged on a shell (1), wherein liquid stabilizing rings (9) are fixedly connected to the first flat plate (8) and the third flat plate (13) respectively, the heat exchange element (10) is a corrugated heat exchange tube, a sleeve (11) corresponding to the heat exchange element (10) is installed on the third flat plate (13), an upper fixing rod (16) is fixedly connected to the lower end face of a second partition plate (12), a filler (15) is fixedly connected to the upper fixing rod (16), and the lower end of the filler (15) is fixedly connected to the upper end face of the third partition plate (13) through a lower fixing rod (14).
5. An evaporative absorber as claimed in claim 4, wherein: the drainage plate assembly is characterized in that two rows of symmetrically arranged drainage plates (17) are fixedly connected to the inner side wall of the shell (1), and a water collector (20) is fixedly connected to the inner side wall of the shell (1).
6. An evaporative absorber as claimed in claim 5, wherein: the lower end opening of the sleeve (11) is of an annular chamfered edge structure.
7. An evaporative absorber as claimed in claim 6, wherein: the liquid stabilizing ring (9) is of a hollow cylindrical structure, an inner liquid distributor (21) is installed at the top end of the corrugated heat exchange tube, and a liquid level meter is installed on the lower side of the air inlet (3).
8. The utility model provides an absorption refrigeration system, includes generator, condenser, evaporimeter, relief pressure valve, circulating pump, choke valve, its characterized in that: the evaporative absorber according to any one of claims 1 to 7, further comprising a lean solution line and a rich solution line connected between the evaporative absorber and the generator, a high pressure gaseous refrigerant line connected between the generator and the condenser, a high pressure liquid refrigerant line connected between the condenser and the evaporator, and a low pressure gaseous refrigerant line connected between the evaporator and the evaporative absorber.
9. An absorption refrigeration system according to claim 8 wherein: the lean solution pipeline is provided with a throttling valve, the rich solution pipeline is provided with a circulating pump, and the high-pressure liquid refrigerant pipeline is provided with a pressure reducing valve.
10. An absorption refrigeration system according to claim 8 wherein: the poor solution pipeline is communicated with the feeding hole (2), the rich solution pipeline is communicated with the discharging hole (4), and the low-pressure gaseous refrigerant pipeline is communicated with the air inlet (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011072756.9A CN112283982B (en) | 2020-10-09 | 2020-10-09 | Evaporation type absorber and absorption type refrigerating system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011072756.9A CN112283982B (en) | 2020-10-09 | 2020-10-09 | Evaporation type absorber and absorption type refrigerating system thereof |
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| CN112283982A true CN112283982A (en) | 2021-01-29 |
| CN112283982B CN112283982B (en) | 2021-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005541A1 (en) * | 2021-07-27 | 2023-02-02 | 安徽普泛能源技术有限公司 | Soda ash production line combined with low-grade waste heat absorption type refrigeration system |
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| CN109556312A (en) * | 2018-10-09 | 2019-04-02 | 宁波工程学院 | Multi-stage absorption refrigerating method |
| CN210801686U (en) * | 2019-09-20 | 2020-06-19 | 安徽普泛能源技术有限公司 | Refrigeration system for absorbing incineration heat |
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| JPH1130453A (en) * | 1997-05-16 | 1999-02-02 | Rinnai Corp | Absorption refrigerator |
| JPH11223420A (en) * | 1998-02-05 | 1999-08-17 | Daikin Ind Ltd | Air cooled absorption refrigerating device |
| JPH11230636A (en) * | 1998-02-17 | 1999-08-27 | Daikin Ind Ltd | Air-cooled absorption refrigerator |
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| CN103109138A (en) * | 2010-05-25 | 2013-05-15 | 7Ac技术公司 | Methods and systems using liquid desiccants for air-conditioning and other processes |
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| CN107560235A (en) * | 2017-08-16 | 2018-01-09 | 刘秋克 | Ice considers potential tower turbulent flow heat pump to be worth doing |
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| CN210801686U (en) * | 2019-09-20 | 2020-06-19 | 安徽普泛能源技术有限公司 | Refrigeration system for absorbing incineration heat |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005541A1 (en) * | 2021-07-27 | 2023-02-02 | 安徽普泛能源技术有限公司 | Soda ash production line combined with low-grade waste heat absorption type refrigeration system |
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| Publication number | Publication date |
|---|---|
| CN112283982B (en) | 2021-10-22 |
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