CN103574979A - Lithium-bromide absorption-type refrigerating machine - Google Patents

Lithium-bromide absorption-type refrigerating machine Download PDF

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Publication number
CN103574979A
CN103574979A CN201310450006.4A CN201310450006A CN103574979A CN 103574979 A CN103574979 A CN 103574979A CN 201310450006 A CN201310450006 A CN 201310450006A CN 103574979 A CN103574979 A CN 103574979A
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CN
China
Prior art keywords
absorber
cooling
lithium
solution
absorption
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Pending
Application number
CN201310450006.4A
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Chinese (zh)
Inventor
吴冬琪
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City Of Kunshan Week City Lithium-Bromide Solution Factory
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City Of Kunshan Week City Lithium-Bromide Solution Factory
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Priority to CN201310450006.4A priority Critical patent/CN103574979A/en
Publication of CN103574979A publication Critical patent/CN103574979A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/27Relating to heating, ventilation or air conditioning [HVAC] technologies
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62Absorption based systems

Abstract

The invention discloses a lithium-bromide absorption-type refrigerating machine, which comprises a solution system, a refrigerant system, a cooling system and a control system, wherein the solution system comprises an absorber, a heat exchanger and a generator which are sequentially connected, the refrigerant system comprises a condenser, an evaporator and the absorber which are sequentially connected, the cooling system comprises a cooling water pool, a water chilling unit and the heat exchanger, a mixing chamber is arranged in the absorber, the inlet end of the mixing chamber is provided with a contracting-expanding nozzle, and the outlet end of the mixing chamber is provided with a diffuser. A liquid and gas type ejector is applied to the absorber, compared with a passive absorption method comprising falling film absorbing and bubbling absorbing, the absorbing manner disclosed by the invention belongs to an active absorption manner, so that the absorbing performance is greatly improved, and due to the adoption of the contracting-expanding nozzle and the diffuser with a small outlet diameter, the refrigerating capacity is favorably improved, and the size of the absorber is reduced.

Description

A kind of lithium-bromide absorption-type refrigerating machine
Technical field
The present invention relates to a kind of lithium-bromide absorption-type refrigerating machine, belong to air conditioner technical field.
Background technology
After industrial flow, unnecessary heat can be taken as waste discharge in surrounding environment, when causing significant wastage, also can cause thermal pollution to environment.Lithium Bromide-water Absorption, with its cold-producing medium environmental protection and can utilize the feature of industrial exhaust heat to obtain paying close attention to widely and applying, further develop sorption type refrigerating technology, and it is very necessary that absorber is carried out to miniaturization and high efficiency improve.
In order to obtain steam or heat, most industrial flows all can produce heat energy by the method for combustion of fossil fuels, flow process finishes postindustrial used heat and is directly discharged into and in environment, causes waste, if adopt the kind of refrigeration cycle by heat drive, such as Absorption Cooling System, these discarded heats just can be converted into effective refrigerating capacity, therefore, the electric energy consuming has just reduced in a large number, if this refrigeration system by heat drive can be used widely, the problem of global warming will obtain certain alleviation.
The application of Absorption Refrigerator can limit the use of the fluorochlorohydrocarbon that causes depletion of the ozone layer, thereby has sustainability; Although Absorption Refrigerator is taking advantage aspect environmental protection and the saving energy, Absorption Refrigerator has the shortcomings such as volume is large, troublesome maintenance; Therefore in order to promote using and promoting of Absorption Refrigerator, the performance that improves Absorption Refrigerator with reduced costs into one of this area research direction.
For refrigeration machine, its absorption pattern mainly contains falling film absorption, bubble absorption and injection type and absorbs 3 kinds.For injection type absorbs, injector is the key point that injection absorption process is achieved.Conventionally, according to the position of nozzle, injector can be roughly divided into two types, and wherein a kind of equipressure that is called as is mixed injector, because static pressure remains unchanged in mixed process; Another is known as homalographic mixing injector because nozzle be positioned at uniform section long-pending in the middle of.At first, it is believed that homalographic mixing injector can mix injector than equipressure and introduce more second fluid, after a large amount of experiment of process, find, while using isobaric mixing injector, the refrigerating capacity of absorber is higher, and therefore the isobaric injector that mixes is all paid close attention in most of research now.For two-phase fluid, slight mixing is at second fluid by injection and while starting to accelerate, and between the two, the greatest differences of speed has caused the generation of shear stress and shear-mixed between two kinds of fluids.According to the theory of Munday, stagnation phenomenon is not caused by second fluid completely, and this guess is also applied in the middle of its numerical simulation by Chou, and makes comparisons with experimental result; His viewpoint had also obtained the support of the injector flow pattern visual research experimental result of Desevaux afterwards, laser tomography technology is also used to study the situation of injector Mixed Zone, but with regard to current research progress, this technology is not yet applied in the middle of refrigerating field; The injector of determining mixed area is to be mainly used widely in ultrasonic field.
Summary of the invention
Goal of the invention of the present invention is to provide a kind of lithium-bromide absorption-type refrigerating machine.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of lithium-bromide absorption-type refrigerating machine, comprise solution system, refrigerant system, cooling system and control system,
Described solution system comprises absorber, heat exchanger and the generator connecting successively;
Described refrigerant system comprises condenser, evaporimeter and the absorber connecting successively;
Described cooling system comprises cooling pond, handpiece Water Chilling Units and heat exchanger;
The cooling water of cooling pond successively passes through described absorber and condenser, after carrying out heat exchange through heat exchanger and cooling water, gets back in cooling pond;
Described generator is connected with the input of gas-liquid separator, and the top of gas-liquid separator is connected with described condenser, and its bottom is connected with heat exchanger;
In described absorber, be provided with mixing chamber, the arrival end of mixing chamber is provided with contraction and enlargement nozzle, and the port of export of mixing chamber is provided with diffuser.
In technique scheme, in described cooling pond, be provided with electric heater.
In technique scheme, in described generator, be provided with heater.
In technique scheme, described mixing chamber is cylindrical, and its diameter is 50mm, and the outlet diameter of described contraction and enlargement nozzle is 5mm, and its throat diameter is 1.5mm; The outlet diameter of described diffuser is 40mm, and its throat diameter is 6mm.
In technique scheme, the back pressure of described diffuser is 500~550Pa.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1. the present invention has developed a kind of lithium-bromide absorption-type refrigerating machine of new construction, liquid-gas type injector is applied in absorber, Passive intake method than falling film absorption and bubble absorption, absorption of the present invention is a kind of active absorption mode, thereby greatly improved absorbent properties, when adopting contraction and enlargement nozzle and the less diffuser of outlet diameter to be conducive to improve refrigerating capacity, reduce the volume of absorber.
2. refrigeration machine of the present invention is simple in structure, is convenient to preparation, is suitable for applying.
Accompanying drawing explanation
Accompanying drawing 1 is lithium-bromide absorption-type refrigerating machine structural representation provided by the present invention.
Wherein: 1, generator; 2, gas-liquid separator; 3, condenser; 4, evaporimeter; 5, absorber; 6, heat exchanger; 7, weak solution flowmeter; 8, heater; N, contraction and enlargement nozzle; M, mixing chamber; D, diffuser; P, solution pump.
The specific embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Shown in accompanying drawing 1, a kind of lithium-bromide absorption-type refrigerating machine, comprises solution system, refrigerant system, cooling system and control system,
Described solution system comprises absorber 5, heat exchanger 6 and the generator 1 connecting successively;
Described refrigerant system comprises gas-liquid separator 3, evaporimeter 4 and the absorber 5 connecting successively;
Described cooling system comprises cooling pond, handpiece Water Chilling Units and heat exchanger 6;
The cooling water of cooling pond successively passes through described absorber 5 and gas-liquid separator 3, after carrying out heat exchange through heat exchanger 6 and cooling water, gets back in cooling pond;
Described generator 1 is connected with the input of gas-liquid separator 2, and the top of gas-liquid separator 2 is connected with described gas-liquid separator 3, and its bottom is connected with heat exchanger 6;
In described absorber 5, be provided with mixing chamber M, the arrival end of mixing chamber is provided with contraction and enlargement nozzle N, and the port of export of mixing chamber is provided with diffuser D.
Solution system refers to the system that in experimental bench, the existing parts of lithium bromide water solution form, and according to the flow direction of solution, is followed successively by absorber 5, solution heat exchanger 6, generator 1, absorber 5.Weak solution in absorber 5 bottoms pumps into generator 1 through weak solution pump P, process weak solution flowmeter 7 and heat exchanger 6 in this process; Weak solution flowmeter 7 is for gathering the state parameter of weak solution, such as flow, temperature and density; Heat exchanger 6 can make weak solution temperature raise to reduce heat required in generator 1, reaches the object of saving the energy, improves the coefficient of performance of system.
Generator 1 is a horizontal stainless steel cylinder, adopts the mode of immersion heating that solution is heated to boiling; Weak solution starts to have refrigerant vapor to separate out from weak solution when fluidized state; Meanwhile, the concentration of surplus solution starts to rise; Owing to can carrying a small amount of lithium-bromide solution unavoidably in refrigerant vapour, therefore, in the upper design of generator 1 gas-liquid separator 2, interior baffled, to remove this part lithium-bromide solution, make refrigerant vapour pure.And, on gas-liquid separator 2 surfaces, be also provided with glass visor, in order to observe the liquid level in generator 1, avoid liquid level too high or too low.
Absorber 5 is mainly comprised of vacuum (-tight) housing, absorption plant, cooling water coil and form four parts.Outside vacuum (-tight) housing is intended to provide for absorber 5 environment of vacuum, because only under the condition of vacuum, concentrated solution just can reach optimum state to the assimilation effect of steam; Even if only have micro-air leak, also can cause very large impact to absorption process, meanwhile, the existence of air can bromizate the corrosion condition aggravation of lithium solution to whole equipment, and pressure sensor has been installed for this reason in vacuum (-tight) housing; Conventionally the pressure in absorber 5 is that temperature by cooling water determines.Vacuum (-tight) housing is a stainless steel tubular device, and top is by the sealing of standard flange lid; In barrel four sides, be provided with visor in order to observe the interior liquid level of absorber 5, liquid gas injection device solution flow pattern etc.Because the absorption process of steam is an exothermic process, design cooling water coil just seems particularly important to take away absorption process liberated heat, so just can make whole absorption process be continued to carry out, absorber 5 is coaxially placed with vacuum (-tight) housing in vacuum (-tight) housing, and realizes respectively refrigerant vapour and concentrated solution enters into absorber 5 from vacuum (-tight) housing outside with flexible pipe and bellows; The concentrated solution that speed is lower forms low-pressure area to enter at a high speed mixing chamber after nozzle, and steam is caused to swabbing action, makes steam initiatively mix to promote the absorption of concentrated solution to steam with concentrated solution.In addition, due to the existence of concentrated solution velocity gradient, generally speaking the flow velocity of concentrated solution is very high again, and the solution in nozzle boundary vicinity can produce tearing effects because of high speed injection, solution border surface is torn, in part, formed low pressure and cause local evaporation and form atomizating phenomenon; From microcosmic point absorption area expanded, the raising of assimilation effect has been produced to facilitation.After mixing completes, weak solution enters diffuser, and the pressure that solution is lower is restored.Finally, the heat discharging in the bottom of the vacuum (-tight) housing absorption process water coil that is cooled is taken away, and the separation of heat and mass transfer process is achieved.
Also completing of absorption process need to be from the participation of the concentrated solution of generator 1, the concentrated solution of high temperature has a lot of heat energy and can utilize, therefore, before entering absorber 5, be provided with solution heat exchanger 6, utilize its high temperature to come preheating to be about to enter the weak solution of generator 1, make himself temperature also be reduced simultaneously and be beneficial to absorb, the power resources of flow of solution are in two concentrated solution pumps.
Refrigerant system refers to the system that parts that in experimental bench water as refrigerant and refrigerant vapour exist form, and according to the flow process of cryogen, is followed successively by gas-liquid separator 3, evaporimeter 4, absorber 5.Water as refrigerant derives from the refrigerant vapour that solution boiling produces in generator 1 and is condensed in gas-liquid separator 3.
Cooling system mainly consists of parts such as handpiece Water Chilling Units, heat exchangers 6; Low-temperature cooling water from cooling pond successively passes through absorber 5 and gas-liquid separator 3, with cooling these two parts of series system, after carrying out heat exchange through heat exchanger 6 and cooling water, gets back in cooling pond; In cooling pond, be also provided with electric heater 8, in order to control cooling water temperature.Handpiece Water Chilling Units adopts R22 as cold-producing medium, can make the temperature of cooling water be controlled between 5~40 degree.
In described cooling pond, be provided with electric heater 8.In described generator 1, be provided with heater 8.Described mixing chamber is cylindrical, and its diameter is 50mm, and the outlet diameter of described contraction and enlargement nozzle is 5mm, and its throat diameter is 1.5mm; The outlet diameter of described diffuser is 40mm, and its throat diameter is 6mm.
The back pressure of described diffuser is 500~550Pa.

Claims (5)

1. a lithium-bromide absorption-type refrigerating machine, is characterized in that: comprise solution system, refrigerant system, cooling system and control system,
Described solution system comprises absorber, heat exchanger and the generator connecting successively;
Described refrigerant system comprises condenser, evaporimeter and the absorber connecting successively;
Described cooling system comprises cooling pond, handpiece Water Chilling Units and heat exchanger;
The cooling water of cooling pond successively passes through described absorber and condenser, after carrying out heat exchange through heat exchanger and cooling water, gets back in cooling pond;
Described generator is connected with the input of gas-liquid separator, and the top of gas-liquid separator is connected with described condenser, and its bottom is connected with heat exchanger;
In described absorber, be provided with mixing chamber, the arrival end of mixing chamber is provided with contraction and enlargement nozzle, and the port of export of mixing chamber is provided with diffuser.
2. lithium-bromide absorption-type refrigerating machine according to claim 1, is characterized in that: in described cooling pond, be provided with electric heater.
3. lithium-bromide absorption-type refrigerating machine according to claim 1, is characterized in that: in described generator, be provided with heater.
4. lithium-bromide absorption-type refrigerating machine according to claim 1, is characterized in that: described mixing chamber is cylindrical, and its diameter is 50mm, and the outlet diameter of described contraction and enlargement nozzle is 5mm, and its throat diameter is 1.5mm; The outlet diameter of described diffuser is 40mm, and its throat diameter is 6mm.
5. lithium-bromide absorption-type refrigerating machine according to claim 1, is characterized in that: the back pressure of described diffuser is 500~550Pa.
CN201310450006.4A 2013-09-28 2013-09-28 Lithium-bromide absorption-type refrigerating machine Pending CN103574979A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105091401A (en) * 2015-07-31 2015-11-25 内蒙古科技大学 Jet absorption refrigerating device with copious cooling effect
CN111520933A (en) * 2020-04-07 2020-08-11 北京建筑大学 Self-pressurization type lithium bromide bubbling absorption device and control method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1241706A (en) * 1998-07-13 2000-01-19 百乐满工业株式会社 Absorption cooling apparatus
CN201173639Y (en) * 2008-02-21 2008-12-31 南京航空航天大学 Refrigerating device for making cold source lower than main refrigerant ice point
CN102353178A (en) * 2011-09-01 2012-02-15 吴健 Lithium bromide absorptive refrigeration air conditioner and sanitary hot water system driven by solar energy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1241706A (en) * 1998-07-13 2000-01-19 百乐满工业株式会社 Absorption cooling apparatus
CN201173639Y (en) * 2008-02-21 2008-12-31 南京航空航天大学 Refrigerating device for making cold source lower than main refrigerant ice point
CN102353178A (en) * 2011-09-01 2012-02-15 吴健 Lithium bromide absorptive refrigeration air conditioner and sanitary hot water system driven by solar energy

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
王锐: "《液-气式引射器的特性研究》", 15 September 2009 *
邓铃: "《基于强制吸收技术的溴化锂制冷实验研究》", 15 September 2011 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105091401A (en) * 2015-07-31 2015-11-25 内蒙古科技大学 Jet absorption refrigerating device with copious cooling effect
CN111520933A (en) * 2020-04-07 2020-08-11 北京建筑大学 Self-pressurization type lithium bromide bubbling absorption device and control method thereof

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Application publication date: 20140212