CN107421157A - A kind of ammonia absorption type power and spray type refrigerating combined cycle system and method - Google Patents
A kind of ammonia absorption type power and spray type refrigerating combined cycle system and method Download PDFInfo
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- CN107421157A CN107421157A CN201710448830.4A CN201710448830A CN107421157A CN 107421157 A CN107421157 A CN 107421157A CN 201710448830 A CN201710448830 A CN 201710448830A CN 107421157 A CN107421157 A CN 107421157A
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- Prior art keywords
- rectifying column
- heat
- absorber
- ammonia
- solution
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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
- F25B15/04—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being ammonia evaporated from aqueous solution
-
- 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
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/02—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam
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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
- F25B41/00—Fluid-circulation arrangements
-
- 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
Abstract
The invention discloses a kind of ammonia absorption type power and spray type refrigerating combined cycle system and method, the wherein system includes absorber, and it is connected with pump；Enter first rectifying column from the element task liquid that absorber comes out through pump pressurization rear portion to reclaim its rectified heat, another part is exchanged heat into Recuperative heat exchanger, and entering back into boiler after the fluid mixing after first rectifying column and Recuperative heat exchanger processing is heated；Boiler is for fluid after heating mixing and produces saturated vapor into progress rectifying in first rectifying column, mix from the solution of boiler bottom discharge after Recuperative heat exchanger exchanges heat with the bottom of towe solution from first rectifying column and Second distillation column, mixed liquor carrys out the ammonia steam of flash-pot and refrigeration heat converter into absorber is interior to absorb.
Description
Technical field
The invention belongs to refrigerating composite circulation field, more particularly to a kind of ammonia absorption type power and spray type refrigerating is compound follows
Loop system and method.
Background technology
In the last few years, the excessive exploitation of fossil energy had triggered a series of ecological problems, realized the reasonable, high of low-temperature heat source
Effect utilizes, and the consumption to reducing conventional fossil fuel, reduces the discharge about pollutant and greenhouse gases, adjusts energy-consuming knot
Structure, preserve the ecological environment, it is significant to establish conservation-minded society.Low-temperature heat source, including solar energy, geothermal energy and
Waste heat, used heat in industrial production, this kind of energy have the characteristics of reserves are big, distribution is wide, grade is low.However, work as heat source temperature
When relatively low, traditional power cycle is difficult by low grade heat energy effectively convert and utilize.On the other hand, Kalina,
Alefeld, Goswami et al. propose a series of circulations using zeotrope ammoniacal liquor as working medium.
Kalina cycle applications absorption pattern solves the too high problem of turbine exhaust back pressure in ammoniacal liquor power cycle, improves
The efficiency of ammoniacal liquor power cycle.Compared with Kalina circulations, Goswami is circulated maximum feature and is not only to be gone back with output work
Cold can be exported, can so meet many-sided demand.In Goswami circulations, substituted using turbine in absorption refrigeration
Choke valve, the dense ammonia steam come out from rectifier enters turbine expansion acting, and turbine lack of gas enter heat exchanger
(refrigeration heat exchanger) absorption refrigeration.Goswami loop structures are simple, can by solar energy, geothermal energy,
The low-temperature heat sources such as industrial exhaust heat drive, however, the circulation is freezed using the sensible heat of turbine lack of gas, due to the specific heat capacity of gas
It is smaller, therefore the refrigerating capacity of its unit mass working medium is very limited, it exports cold work(ratio only 0.08, and lowest refrigerating temperature only has
6.85℃；Also, turbine and heat exchanger are cascade, work done and refrigerating capacity by turbine back pressure and lack of gas mass dryness fraction in the circulation
Restricted etc. factor, export the more difficult adjustment of cold work(.
In summary, there is the problem of refrigerating capacity is smaller, cold work(ratio is not easy to adjust in Goswami power and refrigeration cogenerations system, and
The thermal performance of existing refrigerating composite circulation system is relatively low.
The content of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of ammonia absorption type power and spray type refrigerating is compound follows
Loop system, the system solve Goswami power and refrigeration cogeneration cooling systems by way of coupling ammonia absorption/spray type refrigerating circulation
The problem of smaller, the cold work(ratio of amount is not easy to adjust, and creatively using classification rectifying mode, it is internal cold that the first essence stays device to use
But mode, its whole rectified heat is reclaimed, to lift the thermal performance of co-feeding system.
A kind of the ammonia absorption type power and spray type refrigerating combined cycle system of the present invention, including：
Absorber, it is connected with pump；Enter the first essence from the element task liquid that absorber comes out through pump pressurization rear portion
Tower is evaporated to reclaim its rectified heat, and another part is exchanged heat into Recuperative heat exchanger, at first rectifying column and Recuperative heat exchanger
Boiler is entered back into after fluid mixing after reason to be heated；
The boiler, for heat mix after fluid and produce saturated vapor into carrying out rectifying in first rectifying column, from
Boiler bottom discharge solution after Recuperative heat exchanger exchanges heat with the bottom of towe solution from first rectifying column and Second distillation column
Mixing, mixed liquor enters in absorber carrys out the ammonia steam of flash-pot and refrigeration heat converter to absorb；
The saturated vapor part come out from the tower top of first rectifying column enters turbine expansion after superheater heat and done work, weary
Gas enters refrigeration heat converter absorption refrigeration；Another part ammonia steam enters in Second distillation column enters back into spray after further rectifying
The fractional saturation steam that emitter comes out as working fluid, injection from evaporator, two fluids mix in injector；
The mixed working fluid of injector outlet is condensed into saturated solution into condenser, enters back into evaporation system in evaporator
It is cold；Another part saturated vapor of evaporator outlet enters absorber, so as to complete a cyclic process.
Further, the tower top of first rectifying column obtains ammonia saturated vapor, and it is molten that the bottom of towe of first rectifying column obtains dilute saturation
Liquid.
Further, from the solution of boiler bottom discharge after Recuperative heat exchanger exchanges heat with from first rectifying column and the
The bottom of towe solution mixing of two rectifying columns, mixed liquor enter in absorber after first throttle valve throttles.
Further, the mixed working fluid of injector outlet is condensed into saturated solution into condenser, then through the second section
Enter sweat cooling in evaporator after flowing valve throttling.
Further, the saturated vapor come out from the tower top of first rectifying column is shunted through current divider.
The present invention be based on ammonia absorption type power and spray type refrigerating combined cycle system, additionally provide ammonia absorption type power with
The method of work of spray type refrigerating combined cycle system.
The ammonia absorption type power of the present invention and the method for work of spray type refrigerating combined cycle system, including：
Enter first rectifying column from the element task liquid that absorber comes out through pump pressurization rear portion to reclaim its rectified heat,
Another part is exchanged heat into Recuperative heat exchanger, is entered again after the fluid mixing after first rectifying column and Recuperative heat exchanger processing
Enter boiler to be heated；
Fluid and saturated vapor is produced into rectifying is carried out in first rectifying column, arranged from boiler bottom after boiler heating mixing
The solution gone out mixes after Recuperative heat exchanger exchanges heat with the bottom of towe solution from first rectifying column and Second distillation column, mixed liquor
Carry out the ammonia steam of flash-pot and refrigeration heat converter in into absorber to absorb；
The saturated vapor part come out from the tower top of first rectifying column enters turbine expansion after superheater heat and done work, weary
Gas enters refrigeration heat converter absorption refrigeration；Another part ammonia steam enters in Second distillation column enters back into spray after further rectifying
The fractional saturation steam that emitter comes out as working fluid, injection from evaporator, two fluids mix in injector；Injector
The mixed working fluid of outlet is condensed into saturated solution into condenser, enters back into sweat cooling in evaporator；Evaporator outlet
Another part saturated vapor enters absorber, so as to complete a cyclic process.
Compared with prior art, the beneficial effects of the invention are as follows：
Power and refrigeration cogeneration system proposed by the invention, can be according to customer charge by the way of injector and turbine parallel
Different demands, adjustment exports cold work(ratio.The system can be the Efficient Conversion of low temperature exhaust heat and make full use of the new solution of offer
Approach.
Goswami circulations and absorption/spray type refrigerating circulation are carried out coupling integration by the present invention, increase circularly cooling amount,
Lift the cold work(ratio of co-feeding system；By changing split ratio (SP), the cold ratio of output work is adjusted；
The present invention uses two stage rectification mode, is easy to reclaim its partial rectification heat, the thermal performance of lifting system；
The present invention by introducing injector, to consume certain heat energy as cost, without consumption turbine output work,
Thus under the conditions of increase system output cold, the thermal performance of co-feeding system is improved.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 is the ammonia absorption type power and spray type refrigerating combined cycle system structural representation of the present invention.
Wherein, A-absorber；P-pump；V-1-first throttle valve；R-regenerator；B-boiler；The rectifying of Rec1-first
Device；S-superheater；T-turbine；RHE-refrigeration heat converter；The rectifiers of Rec2-second；EJ-injector；C-condenser；
V-2-second throttle；E-evaporator.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Fig. 1 is the ammonia absorption type power and spray type refrigerating combined cycle system structural representation of the present invention.
As shown in figure 1, the ammonia absorption type power and spray type refrigerating combined cycle system of the present invention, including：
Absorber, pump, first rectifying column, Recuperative heat exchanger, boiler, Second distillation column, evaporator, refrigeration heat converter,
Superheater, turbine and the refrigerating composite circulation system for entering injector composition.
Specifically, the course of work of ammonia absorption type power of the invention and spray type refrigerating combined cycle system is：
First rectifying column is used as from the element task liquid (1) that absorber (A) comes out through pump (P) pressurization rear portion (2 ")
(Rec1) coolant media, its whole rectified heat is reclaimed, (2') another part enters Recuperative heat exchanger (R) and exchanged heat, two fluids
(4) enter back into boiler (B) and heated after (15 and 3) mixing.
Saturated vapor (5) caused by boiler (B) heating, which enters, carries out rectifying in first rectifying column (Rec1), tower top obtains
The higher ammonia saturated vapor (7) of concentration, bottom of towe obtain dilute saturated solution (6)；Passed through back from the weak solution (11) of boiler bottom discharge
Mixed after heat exchanger (R) heat exchange with the weak solution (6,17) from first rectifying column and Second distillation column (Rec2) bottom of towe,
Mixed liquor (13) enters in absorber (A), absorbs ammonia steam (18 Hes for coming flash-pot (E) and refrigeration heat converter (RHE)
10)。
The high-purity saturated vapor come out from first rectifying column (Rec1) tower top is after shunting, and a part of (7 ") are through superheater
(S) turbine (T) expansion work is entered after heat, lack of gas (9) enter refrigeration heat converter (RHE) absorption refrigeration；Another part ammonia steams
Vapour (7 ') enters further rectifying in Second distillation column (Rec2), obtains the higher ammonia steam (16) of concentration, this part ammonia steam
Into injector (EJ), the fractional saturation steam (22) come out as working fluid, injection from evaporator (EV), two fluids exists
Mixed in injector (EJ).The mixed working fluid (18) of injector outlet is condensed into saturated solution (19) into condenser (C), so
Enter evaporator (E) interior sweat cooling afterwards；Another part saturated vapor of evaporator (EV) outlet enters absorber (A) by dilute molten
Liquid (14) absorbs, so as to complete a cyclic process.
Wherein, mixed liquor (13) enters to absorb in absorber (A) after first throttle valve (V-1) throttling carrys out flash-pot
(E) and refrigeration heat converter (RHE) ammonia steam (18 and 10).
Specifically, the mixed working fluid (18) of injector outlet is condensed into saturated solution (19) into condenser (C), then
Enter evaporator (E) interior sweat cooling after second throttle (V-2) throttling.
Specifically, the high-purity saturated vapor that first rectifying column (Rec1) tower top comes out is shunted through current divider (SP).
The present invention establishes ammonia absorption type power of the invention and spray type refrigerating combined cycle system with EES softwares
Thermodynamical model.
In order to facilitate analyzing and discussing, the mass flow that the selected absorber of the present invention exports 1 ammonia solution is 1kgs-1,
Pressure is 0.21MPa, and turbine inlet pressure 2.00MPa, heat source temperature is 117 DEG C, and injector outlet pressure is set as
0.80MPa, other input parameter value are as shown in table 1.
The system input parameter of table 1
According to the thermodynamical model of foundation and the physical parameter of working medium, the thermodynamic parameter of each state point of system is calculated
Value, as shown in table 2.
The ammonia absorption type power of the present invention and the performance result of calculation of spray type refrigerating combined cycle system are as shown in table 3,
Result of calculation shows, under design conditions, the alliance of ammonia absorption type power of the invention and spray type refrigerating combined cycle system
The thermal efficiency is 19.69%, because the rectified heat of the first rectifier obtains whole recovery, allianceEfficiency can reach 31.38%.
The result of calculation of each point during table 2 circulates
The alliance of table 3 calculates can result
Power and refrigeration cogeneration system proposed by the invention, can be according to customer charge by the way of injector and turbine parallel
Different demands, adjustment exports cold work(ratio.The system can be the Efficient Conversion of low temperature exhaust heat and make full use of the new solution of offer
Approach.
Goswami circulations and absorption/spray type refrigerating circulation are carried out coupling integration by the present invention, increase circularly cooling amount,
Lift the cold work(ratio of co-feeding system；By changing split ratio (SP), the cold ratio of output work is adjusted；
The present invention uses two stage rectification mode, is easy to reclaim its partial rectification heat, the thermal performance of lifting system；
The present invention by introducing injector, to consume certain heat energy as cost, without consumption turbine output work,
Thus under the conditions of increase system output cold, the thermal performance of co-feeding system is improved.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
1. a kind of ammonia absorption type power and spray type refrigerating combined cycle system, it is characterised in that including：
Absorber, it is connected with pump；Enter first rectifying column from the element task liquid that absorber comes out through pump pressurization rear portion
To reclaim its rectified heat, another part is exchanged heat into Recuperative heat exchanger, after first rectifying column and Recuperative heat exchanger processing
Fluid mixing after enter back into boiler and heated；
The boiler, for heat mix after fluid and produce saturated vapor into rectifying is carried out in first rectifying column, from boiler
The solution of bottom discharge mixes after Recuperative heat exchanger exchanges heat with the bottom of towe solution from first rectifying column and Second distillation column,
Mixed liquor enters in absorber carrys out the ammonia steam of flash-pot and refrigeration heat converter to absorb；
The saturated vapor part come out from the tower top of first rectifying column enters turbine expansion after superheater heat and done work, and lack of gas are entered
Enter refrigeration heat converter absorption refrigeration；Another part ammonia steam enters in Second distillation column enters back into injector after further rectifying
The fractional saturation steam come out as working fluid, injection from evaporator, two fluids mix in injector；
The mixed working fluid of injector outlet is condensed into saturated solution into condenser, enters back into sweat cooling in evaporator；Steam
Another part saturated vapor of hair device outlet enters absorber, so as to complete a cyclic process.
2. ammonia absorption type power as claimed in claim 1 and spray type refrigerating combined cycle system, it is characterised in that the first essence
The tower top for evaporating tower obtains ammonia saturated vapor, and the bottom of towe of first rectifying column obtains dilute saturated solution.
3. ammonia absorption type power as claimed in claim 1 and spray type refrigerating combined cycle system, it is characterised in that from boiler
The solution of bottom discharge mixes after Recuperative heat exchanger exchanges heat with the bottom of towe solution from first rectifying column and Second distillation column,
Mixed liquor enters in absorber after first throttle valve throttles.
4. ammonia absorption type power as claimed in claim 1 and spray type refrigerating combined cycle system, it is characterised in that injector
The mixed working fluid of outlet is condensed into saturated solution into condenser, then enters after second throttle throttles in evaporator and steams
Hair refrigeration.
5. ammonia absorption type power as claimed in claim 1 and spray type refrigerating combined cycle system, it is characterised in that from first
The saturated vapor that the tower top of rectifying column comes out is shunted through current divider.
6. the method for work of a kind of ammonia absorption type power as claimed in claim 1 and spray type refrigerating combined cycle system, its
It is characterised by, including：
Enter first rectifying column from the element task liquid that absorber comes out through pump pressurization rear portion to reclaim its rectified heat, it is another
Part is exchanged heat into Recuperative heat exchanger, and pot is entered back into after the fluid mixing after first rectifying column and Recuperative heat exchanger processing
Stove is heated；
Fluid and saturated vapor is produced into rectifying is carried out in first rectifying column, after boiler heating mixing from boiler bottom discharge
Solution mixes after Recuperative heat exchanger exchanges heat with the bottom of towe solution from first rectifying column and Second distillation column, and mixed liquor enters
Carry out the ammonia steam of flash-pot and refrigeration heat converter to absorb in absorber；
The saturated vapor part come out from the tower top of first rectifying column enters turbine expansion after superheater heat and done work, and lack of gas are entered
Enter refrigeration heat converter absorption refrigeration；Another part ammonia steam enters in Second distillation column enters back into injector after further rectifying
The fractional saturation steam come out as working fluid, injection from evaporator, two fluids mix in injector；Injector exports
Mixed working fluid be condensed into saturated solution into condenser, enter back into sweat cooling in evaporator；Evaporator outlet it is another
Fractional saturation steam enters absorber, so as to complete a cyclic process.
7. the method for work of ammonia absorption type power as claimed in claim 6 and spray type refrigerating combined cycle system, its feature
It is, the tower top of first rectifying column obtains ammonia saturated vapor, and the bottom of towe of first rectifying column obtains dilute saturated solution.
8. the method for work of ammonia absorption type power as claimed in claim 6 and spray type refrigerating combined cycle system, its feature
Be, from boiler bottom discharge solution after Recuperative heat exchanger exchanges heat with the tower from first rectifying column and Second distillation column
Bottom solution mixing, mixed liquor enter in absorber after first throttle valve throttles.
9. the method for work of ammonia absorption type power as claimed in claim 6 and spray type refrigerating combined cycle system, its feature
It is, the mixed working fluid of injector outlet is condensed into saturated solution into condenser, is then throttled through second throttle laggard
Enter sweat cooling in evaporator.
10. the method for work of ammonia absorption type power as claimed in claim 6 and spray type refrigerating combined cycle system, its feature
It is, the saturated vapor come out from the tower top of first rectifying column is shunted through current divider.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710448830.4A CN107421157B (en) | 2017-06-14 | 2017-06-14 | Ammonia absorption type power and injection type refrigeration composite circulation system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710448830.4A CN107421157B (en) | 2017-06-14 | 2017-06-14 | Ammonia absorption type power and injection type refrigeration composite circulation system and method |
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| CN107421157A true CN107421157A (en) | 2017-12-01 |
| CN107421157B CN107421157B (en) | 2019-12-24 |
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Cited By (2)
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| CN110345458A (en) * | 2019-07-29 | 2019-10-18 | 中国科学院工程热物理研究所 | Low temperature exhaust heat and electrically driven (operated) high temperature combined heat-pump system and steam generating method |
| CN112413922A (en) * | 2020-11-18 | 2021-02-26 | 山东大学 | Power-cooling combined supply system and method for fully utilizing middle-low grade industrial waste heat |
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| CN101319828A (en) * | 2008-07-01 | 2008-12-10 | 西安交通大学 | Absorption type refrigeration and power combined circulating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110345458A (en) * | 2019-07-29 | 2019-10-18 | 中国科学院工程热物理研究所 | Low temperature exhaust heat and electrically driven (operated) high temperature combined heat-pump system and steam generating method |
| CN112413922A (en) * | 2020-11-18 | 2021-02-26 | 山东大学 | Power-cooling combined supply system and method for fully utilizing middle-low grade industrial waste heat |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107421157B (en) | 2019-12-24 |
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