CN1353288A - Serially connected three-effect absorption-type refrigerator with vapour compression - Google Patents
Serially connected three-effect absorption-type refrigerator with vapour compression Download PDFInfo
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- CN1353288A CN1353288A CN01142613A CN01142613A CN1353288A CN 1353288 A CN1353288 A CN 1353288A CN 01142613 A CN01142613 A CN 01142613A CN 01142613 A CN01142613 A CN 01142613A CN 1353288 A CN1353288 A CN 1353288A
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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
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Abstract
A serially connected three-effect absorption-type refrigerator with vapour compressor is disclosed. A vapour compressor is connected between medium pressure and low-pressure generators in refrigerant loop for lowering the temp. of high-pressure generator, relaxing the corrosion of high-temp. aqueous solution of lithium bromide to matal material and improving the working condition of low-pressure generator. Its advantages include simple structure, no high-temp. corrosion and high utilization rate of energy.
Description
Technical field:
The present invention relates to a kind of refrigerating plant, relate in particular to a kind of serially connected three-effect absorption-type refrigerator of carrying vapour compression, belong to the Refrigeration and Cryogenic Engineering applied technical field.
Background technology:
Absorption type refrigerating unit is to drive with heat energy, adopts binary or polynary working medium right, realize refrigeration and heat with the evaporation of low boiling component (cold-producing medium) and condensation, with high boiling component (absorbent) to the absorption and desorption of the cold-producing medium circulation of finishing the work.At present, the most frequently used working medium of absorption refrigeration unit is to being lithium bromide-aqueous solution.
The coefficient of performance COP of initial single-effect lithium bromide absorption refrigerating machine is 0.7, two coefficient of performance COP of imitating lithium-bromide absorption-type refrigerating machine commonly used now bring up to 1.0～1.2, but on overall performance, lithium-bromide absorption-type refrigerating machine in the past still can not replace compression refrigerating machine.For using the high-grade thermal source more rationally and effectively, improve the energy utilization rate of lithium-bromide absorption-type refrigerating machine group, improve its market competitiveness, triple effect or multiple-effect Absorption Cooling System have been proposed, comprising the serially connected three-effect kind of refrigeration cycle.
In recent years, colleges and universities both domestic and external, research institution and producer have carried out deep experimental study and simulation calculation to the triple effect lithium-bromide absorption-type refrigerating machine, as the breadboard Grossman of U.S.'s Oak Ridge, Wilk and De Vault (draw certainly: G Grossman at document, M.Wilk, and R.C.De Vault, Simulation andperformance analysis of triple-effect absorption cycles, ASHRAE Trans, 1994 (1), Vol.100, No.1) in, introduction has been done in triple effect lithium bromide absorbing type refrigeration circulation of serial flow etc., and carried out simulation study.In the absorption type refrigerating unit of series connection, weak solution in the absorber enters successively in high pressure, middle pressure, the low pressure generator after by high temperature, middle temperature, low temperature heat exchanger and concentrates, weak solution in the high pressure generator is heated by extraneous thermal source, middle Steam Heating of pressing the solution in the generator to be produced by high pressure generator, the Steam Heating of pressing generator to produce in the solution quilt in the low pressure generator.Basic serially connected three-effect refrigerating plant mainly comprises with lower member: high pressure generator, middle pressure generator, low pressure generator, absorber, solution heat exchanger, condenser, evaporimeter and cooling tower etc. also comprise annexes such as some pumps and valve in addition.The connected mode of solution loop is: the absorber taphole through the tube side of low temperature, middle temperature, high-temperature heat exchanger, links to each other with the high pressure generator solution inlet port.The taphole of high pressure generator through the shell side of high-temperature heat exchanger, links to each other with the solution inlet port of middle pressure generator.Middle taphole of pressing generator, the shell side of warm interchanger links to each other with the solution inlet port of low pressure generator in the warp.The taphole of low pressure generator through the shell side of low temperature heat exchanger, links to each other with the absorber solution inlet port.The connected mode of refrigerant loop is: the steam (vapor) outlet of high pressure generator shell side is given birth to the import of organ pipe journey with middle Hair Fixer and is linked to each other.Import links to each other the steam (vapor) outlet of middle pressure generator shell side with the low pressure generator tube side.The steam (vapor) outlet of low pressure generator shell side links to each other with condenser shell side steam inlet.Import links to each other the outlet of condenser shell side with the evaporimeter shell side, and import links to each other the outlet of evaporimeter shell side with the absorber shell side.Result of study shows that the absorber inlet concentration of serial flow is 64.1%, and the highest solution temperature of circulation (high pressure generator outlet solution temperature) is 218 ℃ (425 °F).
Lithium-bromide solution is a kind of stronger corrosive medium, to making metal materials such as lithium bromide absorption-type machine unit carbon steel commonly used, red copper, has stronger corrosivity.In the solution that does not contain corrosion inhibiter, the rate of corrosion of carbon steel, red copper and ambrose alloy all increases along with the rising of temperature, when temperature surpasses 165 ℃, no matter is carbon steel or red copper, and rate of corrosion all sharply increases.And the highest solution temperature of general triple effect lithium bromide absorbing type refrigeration circulation will reach 220 ℃ or higher, under so high temperature, the heavy corrosion that lithium-bromide solution can cause absorption refrigeration unit metal part to be divided, this is the reason that present triple effect lithium-bromide absorption-type refrigerating machine still is in the experimental study state, has seriously hindered the marketization of triple effect lithium-bromide absorption-type refrigerating machine group.And with regard in the data that retrieves at present, the fine way that does not also address this problem.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, the serially connected three-effect absorption-type refrigerator that provides a kind of new carrying vapour to compress, reduce the highest solution temperature of circulation, solve triple effect lithium-bromide absorption-type refrigerating machine group high temperature corrosion problem, improve energy utilization rate.
For realizing such purpose, the present invention has done improvement to existing tandem type triple effect lithium bromide water absorption refrigerating plant, introduces the both vapor compression link in basic tandem type triple effect lithium bromide water absorption refrigerating plant.With the difference of original device be: the present invention has increased a vapour compression unit on the basis of original device, and the water vapour that middle pressure generator obtains needs to send into after compression low pressure generator again.This advantage that has the triple effect lithium bromide absorbing type refrigeration circulation of vapour compression unit is: owing to introduce vapour compression unit, the occurrence temperature of high pressure generator is minimized, and has alleviated the high temperature lithium bromide water solution to Corrosion of Metallic Materials; The water vapour that enters low pressure generator through overcompression has higher temperature and pressure, helps improving the occurrence condition of low pressure generator.
The both vapor compression serially connected three-effect absorption-type refrigerator that has of the present invention mainly comprises parts such as vapour compression unit, high pressure generator, middle pressure generator, low pressure generator, absorber, solution heat exchanger, condenser, evaporimeter and cooling tower, constitutes solution loop, refrigerant loop and chilled(cooling) water return (CWR).Compare with existing apparatus, difference is: increased vapour compression unit in refrigerant loop, the steam (vapor) outlet of middle pressure generator shell side and the import of vapour compression unit link to each other, and import links to each other with the low pressure generator tube side in the outlet of vapour compression unit.
Its operation principle flow process is: the water as refrigerant in the condenser enters heat absorption evaporation in the evaporimeter after throttling, produce refrigeration.The steam that produces enters in the absorber and is absorbed by solution.Weak solution from absorber flows out flows through successively after solution pump boosts in low temperature, the middle gentle high-temperature solution heat exchanger and heats up.The weak solution that flows out from high-temperature heat exchanger enter successively high pressure, concentrate in the pressure, low pressure generator, the solution after concentrating flows back to absorber behind high temperature, middle temperature, low temperature heat exchanger.Weak solution in the extraneous thermal source heating high-pressure generator is pressed the solution in the generator in the Steam Heating that high pressure generator produces, the steam that middle pressure generator produces, and after the vapour compression unit pressurization, heating up, the solution in the heating low pressure generator.The steam that high pressure water as refrigerant, middle pressure water as refrigerant and low pressure generator produce flows in the condenser together, is condensed into the lower water as refrigerant of pressure.
The present invention is applicable to the tandem type three-effect absorption-type refrigerator of existing various connected modes, comprises the three-effect absorption-type of falling tandem type kind of refrigeration cycle and tandem type DCC Absorption Cooling System (increasing a type of attachment of coagulating water heat exchanger between middle temperature solution heat exchanger and low pressure generator) etc.
The present invention also can place vapour compression unit between high pressure generator and the pressure generator, equally also be applicable to the tandem type three-effect absorption-type refrigerator of existing various connected modes, so can constitute several tandem type triple effect lithium bromide water absorption refrigerating plants that have vapour compression unit in addition.
The present invention compares with the serially connected three-effect circulation of carrying vapour compression set not, and only many compression member do not increase the complexity of system architecture too much, but have obvious superiority.The result shows, because the introducing of vapour compression unit, the outlet solution temperature of high pressure generator and middle pressure generator is able to obvious reduction, the particularly important is and reduced circulation the highest solution temperature (high pressure generator outlet solution temperature) significantly, avoid the deep-etching problem of high temperature lithium-bromide solution, needn't select too expensive material for use.After adding vapour compression unit, the generation pressure of high pressure generator and middle pressure generator is able to obvious reduction, makes high pressure generator not need the design of pressing force container.In addition, the coefficient of performance COP that this novel triple effect circulates has improved rate of energy much larger than double-effect process.Thus, the present invention has good market development prospect.The description of drawings and the specific embodiment:
For understanding technical scheme of the present invention better, describe in further detail below in conjunction with accompanying drawing.
Fig. 1 is a basic structure schematic diagram of the present invention
Figure 1 shows that the basic both vapor compression serially connected three-effect absorption-type refrigerator that has, mainly comprise high pressure generator (1), middle pressure generator (2), low pressure generator (4), absorber (12), solution heat exchanger, condenser (5), evaporimeter (10) and cooling tower parts such as (6), connect into solution loop, refrigerant loop and chilled(cooling) water return (CWR).Concrete connected mode is as follows:
The connected mode of solution loop is: absorber (12) taphole through the tube side of low temperature (15), middle temperature (16), high-temperature heat exchanger (17), links to each other with high pressure generator (1) solution inlet port.The taphole of high pressure generator (1), the shell side through high-temperature heat exchanger (17) links to each other with the solution inlet port of middle pressure generator (2).Middle taphole of pressing generator (2), the shell side of warm interchanger (16) links to each other with the solution inlet port of low pressure generator (4) in the warp.The taphole of low pressure generator (4), the shell side through low temperature heat exchanger (15) links to each other with absorber (12) solution inlet port.
In refrigerant loop, insert a vapour compression unit (3) between the refrigerant vapour port of export of middle pressure generator (2) shell side and the tube side entrance point of low pressure generator (4).Concrete connected mode is: the tube side import links to each other the steam (vapor) outlet of high pressure generator (1) shell side with middle pressure generator (2), the middle steam (vapor) outlet of generator (2) shell side and the air entry of vapour compression unit (3) of pressing is connected, the gas outlet of vapour compression unit (3) links to each other with the tube side import of low pressure generator (4), and the steam (vapor) outlet of low pressure generator (4) shell side links to each other with condenser (5) shell side steam inlet.The shell side import links to each other the outlet of condenser (5) shell side with evaporimeter (10), and the shell side import links to each other the outlet of evaporimeter (10) shell side with absorber (12).
In the chilled(cooling) water return (CWR), the cooling water channel of condenser (5) and absorber (12) is connected with cooling tower (6).
Its operation principle flow process is: the bromize lithium dilute solution that flows out from absorber (12) enters high pressure generator (1) through boost flow through low temperature (15), middle temperature (16), high-temperature solution heat exchanger (17) of solution pump (14).Weak solution is heated intensification in solution heat exchanger after, in high pressure generator (1), be driven the thermal source heating again, produce refrigerant vapour, be condensed into the higher solution of concentration.The solution that high pressure generator flows out under the effect of pressure reduction, is pressed in entering in the generator (2), and the refrigerant vapour heating by from high pressure generator produces refrigerant vapour, and lithium-bromide solution is concentrated once more.The middle solution of generator of pressing is under the effect of pressure reduction, enter in the low pressure generator (4), from refrigerant vapour condensation heat release low pressure generator that vapour compression unit (3) flows out, the solution of heating low pressure generator, produce refrigerant vapour, the solution of low pressure generator is condensed to concentrated solution.Concentrated solution always weak solution heat release of self-absorption device (12) in solution heat exchanger that low pressure generator flows out absorbs the refrigerant vapour of flash-pot (10) again in absorber, be diluted to weak solution, emits the absorption heat of solution simultaneously to cooling water.The steam and high pressure water as refrigerant, the middle pressure water as refrigerant that produce in the low pressure generator (4) flow in the condenser (5) together, therein to the cooling water heat release, condense into the lower water as refrigerant of pressure.Water as refrigerant from condenser flows out enters evaporimeter (10) through the throttling arrangement throttling.Water as refrigerant evaporates in evaporimeter, simultaneously to the cold water heat absorption, makes it cooling and the generation refrigeration.Finished the process of refrigerastion of the basic tandem type triple effect lithium bromide water absorption refrigerating plant that has vapour compression unit.
Fig. 2 is the another kind of basic tandem type refrigerating plant structural representation of the present invention.
As shown in Figure 2, in refrigerant loop, insert vapour compression unit (3) between high pressure generator (1) and the middle pressure generator (2), other structure and Fig. 1 have then constituted the another kind of basic tandem type triple effect lithium bromide water absorption refrigerating plant that has vapour compression unit together.
Fig. 3 is the three-effect absorption-type refrigerator of falling the tandem type of carrying vapour compression
As shown in Figure 3, the three-effect absorption-type refrigerator of falling the tandem type of carrying vapour compression is compared with Fig. 1 structure, and refrigerant loop is identical, the solution loop difference.The connected mode of its solution loop is: absorber (12) taphole, the tube side through low temperature heat exchanger (15) links to each other with the solution inlet port of low pressure generator (4).The taphole of low pressure generator (4), the tube side of warm interchanger (16) links to each other with the solution inlet port of middle pressure generator (2) in the warp.Middle taphole of pressing generator (2), the tube side through high-temperature heat exchanger (17) links to each other with high pressure generator (1) solution inlet port.The taphole of high pressure generator (1) through the shell side of high temperature (17), middle temperature (16), low temperature heat exchanger (17), links to each other with absorber (12) solution inlet port.
Operation principle flow chart and difference shown in Figure 1 are: from the weak solution of absorber (12) outflow, behind solution heat exchanger, flow into low pressure generator (4), middle pressure generator (2) and high pressure generator (1) successively, solution after heating concentrates flows back to absorber (12) behind solution heat exchanger.
If vapour compression unit (3) is placed between high pressure generator (1) and the pressure generator (2), can constitute the tandem type triple effect lithium bromide water absorption refrigerating plant that another kind has the steam compression apparatus again.
Equally, the present invention also is applicable to tandem type DCC Absorption Cooling System, constitutes two kinds of serially connected three-effect absorption-type refrigerators that have both vapor compression in addition.
Claims (3)
1, a kind of serially connected three-effect absorption-type refrigerator of carrying vapour compression, mainly comprise solution loop, refrigerant loop and chilled(cooling) water return (CWR), absorber (12) taphole, through low temperature (15), middle temperature (16), the tube side of high-temperature heat exchanger (17), link to each other with high pressure generator (1) solution inlet port, the taphole of high pressure generator (1), shell side through high-temperature heat exchanger (17), link to each other with the solution inlet port of middle pressure generator (2), middle taphole of pressing generator (2), the shell side of warm interchanger (16) in the warp, link to each other with the solution inlet port of low pressure generator (4), the taphole of low pressure generator (4), shell side through low temperature heat exchanger (15), link to each other with absorber (12) solution inlet port, the tube side import links to each other the steam (vapor) outlet of high pressure generator (1) shell side with middle pressure generator (2), the steam (vapor) outlet of low pressure generator (4) shell side links to each other with condenser (5) shell side steam inlet, the shell side import links to each other the outlet of condenser (5) shell side with evaporimeter (10), the shell side import links to each other the outlet of evaporimeter (10) shell side with absorber (12), it is characterized in that increasing in the refrigerant loop vapour compression unit (3), be connected between the tube side import of the refrigerant vapour outlet of pressing generator (2) shell side and low pressure generator (4), the refrigerant vapour outlet of middle pressure generator (2) shell side is connected with the air entry of vapour compression unit (3), and the gas outlet of vapour compression unit (3) is connected with the tube side import of low pressure generator (4).
2,, it is characterized in that the vapour compression unit (3) that increases in the refrigerant loop is installed between the tube side import of the refrigerant vapour outlet of high pressure generator (1) shell side and middle pressure generator (2) as the serially connected three-effect absorption-type refrigerator of the said carrying vapour of claim 1 compression.
3, serially connected three-effect absorption-type refrigerator as claim 1 or 2 said carrying vapour compressions, it is characterized in that being the circulation of falling the tandem type, in solution loop, absorber (12) taphole links to each other through the tube side of low temperature heat exchanger (15) and the solution inlet port of low pressure generator (4), the tube side of warm interchanger (16) and the solution inlet port of middle pressure generator (2) link to each other in the taphole warp of low pressure generator (4), the middle taphole of generator (2) of pressing links to each other with high pressure generator (1) solution inlet port through the tube side of high-temperature heat exchanger (17), and the taphole of high pressure generator (1) is through high temperature (17), middle temperature (16), the shell side of low temperature heat exchanger (17) links to each other with absorber (12) solution inlet port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01142613A CN1353288A (en) | 2001-12-11 | 2001-12-11 | Serially connected three-effect absorption-type refrigerator with vapour compression |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01142613A CN1353288A (en) | 2001-12-11 | 2001-12-11 | Serially connected three-effect absorption-type refrigerator with vapour compression |
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| CN1353288A true CN1353288A (en) | 2002-06-12 |
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| CN01142613A Pending CN1353288A (en) | 2001-12-11 | 2001-12-11 | Serially connected three-effect absorption-type refrigerator with vapour compression |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380069C (en) * | 2002-09-27 | 2008-04-09 | 株式会社荏原制作所 | Absorption refrigerator |
| CN100562277C (en) * | 2002-06-26 | 2009-11-25 | 陈永坚 | Beverage maker |
| CN102519165A (en) * | 2012-01-04 | 2012-06-27 | 中南大学 | Triple-effect lithium bromide absorption type refrigerating device |
-
2001
- 2001-12-11 CN CN01142613A patent/CN1353288A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100562277C (en) * | 2002-06-26 | 2009-11-25 | 陈永坚 | Beverage maker |
| CN100380069C (en) * | 2002-09-27 | 2008-04-09 | 株式会社荏原制作所 | Absorption refrigerator |
| CN102519165A (en) * | 2012-01-04 | 2012-06-27 | 中南大学 | Triple-effect lithium bromide absorption type refrigerating device |
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