CN102954617B - Compound heat pump with steam type injection/lithium bromide absorption - Google Patents
Compound heat pump with steam type injection/lithium bromide absorption Download PDFInfo
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- CN102954617B CN102954617B CN201210493090.3A CN201210493090A CN102954617B CN 102954617 B CN102954617 B CN 102954617B CN 201210493090 A CN201210493090 A CN 201210493090A CN 102954617 B CN102954617 B CN 102954617B
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Abstract
The invention provides a compound heat pump with steam type injection/lithium bromide absorption. The compound heat pump with the steam type injection/lithium bromide absorption comprises an evaporator, wherein the evaporator is externally connected with a low temperature heat source pipeline; the evaporator is arranged in the interior of an absorber; a liquid outlet of the absorber is connected with a generator in which a condenser is arranged through a dilute solution pipeline, and then communicated with a first liquid inlet of the absorber through a concentrated solution pipeline; the absorber is connected with a heat net pipeline; the heat net pipeline passes through the absorber and the condenser in order, and then is output to a user supplied with heat by a heat net; a coolant outlet of the condenser is connected to a first coolant inlet of the evaporator through a pipeline; a steam outlet of the generator is communicated with a steam injector externally connected with a high pressure steam incoming pipeline through an injected steam pipeline; and an outlet of the steam injector is output through by a motive steam pipeline, a drain pipeline on the bottom part of the generator and a motive steam drain pipeline. With the adoption of the compound heat pump provided by the invention, the safe stable operation of a system can be realized; the steam energy is utilized efficiently; and the effect of energy conservation and emission reduction is obvious.
Description
Technical field
The present invention relates to a kind of combined heat-pump, particularly a kind of compound heat pump with steam type injection/lithium bromide absorption.
Background technology
Steam lithium bromide absorption heat pump adopts steam as thermal source, utilizes lithium-bromide solution can separate out water vapour under certain condition, and in an other condition can the characteristic outward supplying heat of strong absorption water vapour.Due to lithium bromide absorption heat pump, when carrying out steam pressure higher than required driving pressure, due to coefficient of heat supply to drive steam pressure change and insensitive, so coefficient of heat supply is substantially constant; And Tathagata steam pressure is too high when actual motion, generator can be made to produce the problem such as fouling, corrosion, affect the safe and stable operation of lithium bromide absorption heat pump.
Summary of the invention
The object of the present invention is to provide one can realize security of system stable operation, steam energy efficiency utilization, the obvious compound heat pump with steam type injection/lithium bromide absorption of energy-saving and emission-reduction benefit.
In order to achieve the above object, the technical solution used in the present invention is: comprise and be arranged in absorber and be circumscribed with the evaporimeter of low-temperature heat source pipeline, the liquid outlet of absorber is connected with the generator being built-in with condenser by weak solution pipeline, the outlet of generator is communicated with the first liquid entrance of absorber through concentrated solution pipeline again, heat supply network pipeline exports heat supply network user to through after absorber and condenser successively, and the cryogen outlet of condenser is connected to the first cryogen entrance of evaporimeter by pipeline;
The steam (vapor) outlet of described generator through being connected with the steam jet ejector being circumscribed with high pressure and coming vapor pipeline by jetting steam caused pipeline, the outlet of steam jet ejector be connected with through the pipeline bottom generator discharge hydrophobic.
Described is also provided with demister by jetting steam caused pipeline, and demister is divided into two-way, and a road is connected with the second liquid entrance of absorber from the liquid outlet of demister, and another road is connected from the steam (vapor) outlet of demister with steam jet ejector.
Be provided with between described absorber and generator for the heat exchanger by weak solution pipeline and concentrated solution pipeline.
The weak solution pipeline of the liquid outlet of described absorber is also provided with solution pump.
The water intaking valve of outlet successively on refrigerant circuit of the hydrophobic pipeline bottom described generator, water supply tank and water compensating valve are connected with the second cryogen entrance of evaporimeter in absorber.
The export pipeline of described evaporimeter is provided with cryogenic fluid pump, and cryogen delivery side of pump is connected with the second cryogen entrance.
The liquid outlet of described absorber is provided with fluid reservoir, and fluid reservoir is divided into two-way, and the weak solution pipeline of a road through the exit of tapping valve and solution pump converges, then is connected with heat exchanger, and the concentrated solution pipeline of another road through liquid feed valve and heat exchanger exit place converges.
The pipeline that the liquid outlet of described demister is connected with the second liquid entrance of absorber is provided with drain valve.
Compared with prior art, beneficial effect of the present invention is:
The high pressure that the present invention the utilizes steam jet ejector external high pressure come in vapor pipeline carrys out the vapour steam that injection generator produces in steam jet ejector, then change the driving steam (providing evaporation thermal source to the lithium-bromide solution in generator) for lithium bromide absorption heat pump into, thus form compound heat pump with steam type injection/lithium bromide absorption.
Steam jet ejector is that a kind of structure is simple, mechanical moving component, safe and reliable energy saver, is widely used in multiple fields.The high pressure of combined heat-pump of the present invention carrys out vapour and forms high velocity air through nozzle expansion, the low-pressure steam produced with generator mixes, the middle pressure steam of mineralization pressure between high steam and low-pressure steam after hybrid chamber, its essence is and utilize the kinetic energy of high steam to promote the pressure of low-pressure steam, enable combined heat-pump safe and stable operation of the present invention, thus realize the efficiency utilization of steam energy.
Calculating shows, the coefficient of heat supply of compound heat pump with steam type injection/lithium bromide absorption of the present invention improves more than 20% than former lithium bromide absorption heat pump, and energy-saving and emission-reduction benefit is obvious.
Accompanying drawing explanation
Fig. 1 is compound heat pump with steam type injection/lithium bromide absorption principle schematic of the present invention;
Fig. 2 is the principle schematic of steam jet ejector;
Wherein, 1, steam jet ejector, 2, generator, 3, demister, 4, drain valve, 5, absorber, 6, fluid reservoir, 7, tapping valve, 8, liquid feed valve, 9, solution pump, 10, water supply tank, 11, water intaking valve, 12, water compensating valve, 13, evaporimeter, 14, heat exchanger, 15, cryogenic fluid pump, 16, condenser, 17, nozzle.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
See Fig. 1, the present invention includes absorber 5 and be arranged on the evaporimeter 13 being circumscribed with low-temperature heat source pipeline in absorber 5, the liquid outlet of absorber 5 is connected with the generator 2 being built-in with condenser 16 by weak solution pipeline, the outlet of generator 2 is communicated with the first liquid entrance of absorber 5 through concentrated solution pipeline again, wherein, the heat exchanger 14 of weak solution pipeline and concentrated solution pipeline is provided with between absorber 5 and generator 2, solution pump 9 is also provided with between the liquid outlet of absorber 5 and the weak solution line entry of heat exchanger 14, the cryogen outlet of condenser 16 is connected to the first cryogen entrance of evaporimeter 13 by pipeline, heat supply network pipeline exports heat supply network user to through after absorber 5 and condenser 16 successively, the steam (vapor) outlet of generator 2 is through being connected with the steam jet ejector 1 being circumscribed with high pressure and coming vapor pipeline by jetting steam caused pipeline, and on jetting steam caused pipeline, demister 3 is installed, demister 3 is divided into two-way, one tunnel is connected with the second liquid entrance of absorber 5 from the liquid outlet of demister 3, and another road is connected from the steam (vapor) outlet of demister 3 with jetting steam caused pipeline.
Consider that the steam that generator produces may carry some lithium-bromide solution drops, for ensureing the normal operation of combined heat-pump of the present invention, need to arrange that demister 3 is to realize vapor-liquid separation in by jetting steam caused pipeline, isolated lithium-bromide solution returns absorber by drain valve 4.
So, the present invention is provided with demister 3 at the steam (vapor) outlet of generator 2, demister 3 is divided into two-way, one tunnel is connected with the second liquid entrance of absorber 5 by drain valve 4 from the liquid outlet of demister, another road is from the steam (vapor) outlet of demister through being connected with the steam jet ejector 1 being circumscribed with high pressure and coming vapor pipeline by jetting steam caused pipeline, and the outlet of steam jet ejector 1 is again through driving the hydrophobic pipeline bottom steam pipework, generator 2 and driving steam drainage pipeline to export.
The some vapor produced due to generator 2 enters steam jet ejector, the low-pressure steam flow that the condensing water flow that therefore condenser 16 produces absorbs lower than absorber 5.For keeping the water balance of combined heat-pump of the present invention, need part to drive the hydrophobic of steam to lead back in evaporimeter 13.
So, the water intaking valve 11 of outlet successively on refrigerant circuit of the hydrophobic pipeline bottom generator 2 of the present invention, water supply tank 10 and water compensating valve 12 are connected with the second cryogen entrance of evaporimeter 13 in absorber 5, the outlet of evaporimeter 13 through converging with from water compensating valve 12 pipeline out through cryogenic fluid pump 15, then the second cryogen entrance of Returning evaporimeter 13.
Consider that the heat supply network supply water temperature of heat supply network heating user requirement is with variation of ambient temperature, the present invention adopts the mode becoming lithium-bromide solution concentration to improve the coefficient of heat supply of combined heat-pump system of the present invention.When supply water temperature changes, by changing the concentration of lithium-bromide solution, the driving steam pressure required by change, improve the mass ratio of induced-to-inducing air of steam jet ejector.
So, the present invention is provided with fluid reservoir 6 at the liquid outlet of absorber 5, fluid reservoir 6 is divided into two-way, one tunnel is converged through the weak solution pipeline of tapping valve 7 with the exit of solution pump 9, then enter in heat exchanger 14, be connected with the liquid inlet of generator 2, another road is converged through the concentrated solution pipeline of liquid feed valve 8 with heat exchanger 14 exit, is then connected with the first liquid entrance of absorber 5 again;
The fluid reservoir 6 that the present invention is arranged is built with the combined heat-pump of the present invention lithium-bromide solution unnecessary when low concentration runs, and when heat supply temperature declines, the aperture of unlatching tapping valve 7, increase water compensating valve 12 is to reduce the concentration of lithium-bromide solution; When heat supply temperature rises, open liquid feed valve 8, reduce the aperture of water compensating valve 12 to increase the concentration of lithium-bromide solution.
It is as follows that combined heat-pump of the present invention runs operation principle:
See Fig. 1, in the lithium bromide absorption heat pump course of work of the present invention, the concentration of lithium-bromide solution is about about 60%, and its evaporating temperature is higher than pure water about 40 DEG C.The low-pressure steam that lithium-bromide solution in absorber 5 absorbs evaporimeter 13 releasing becomes bromize lithium dilute solution, the temperature of hot net water is improved about 40 DEG C, then heat absorption is rear to user's heat supply further along the condenser 16 that heat supply network pipeline enters in generator 2 for hot net water, and the condensate liquid of condenser 16 is also got back in evaporimeter 13 by pipeline.Bromize lithium dilute solution enters generator 2 through solution pump 9, heat exchanger 14 successively, because the bromize lithium dilute solution in generator 2 concentrates by the driving steam bottom generator 2, the saturation temperature of the steam produced is lower than bromize lithium dilute solution about 40 DEG C, and steam carries out heat exchange by condenser 16 and hot net water, then user's heat supply is given, bromize lithium dilute solution simmer down to bromize lithium concentrated solution now.In this course, by absorption and the evaporation of lithium-bromide solution, the low-pressure steam that evaporimeter 13 produces is converted to the steam of the elevated pressures that generator produces, thus forms heat chemistry compression, the power of this process is the available energy driving steam.
Analyze this process can find out, as long as drive steam-energy to bromizate lithium weak solution complete evaporation in generator 2, then heat pump can run; And lithium-bromide solution equals its quantity of steam evaporated in generator 2 at the systemic quantity of steam of absorber 5, the coefficient of heat supply of this system is 2 in the ideal case, and due to various loss during actual motion, its coefficient of heat supply generally about 1.7, and this value to drive steam pressure change and insensitive.When driving steam pressure higher than pressure needed for operation of heat pump, its coefficient of heat supply is substantially constant, and the driving steam of excess pressure can make generator produce the problem such as fouling, corrosion, the safe operation of influential system.
For solving the problem, the present invention proposes to arrange steam jet ejector 1 in lithium bromide absorption heat pump, the steam adopting high pressure to carry out vapour injection generator to produce, mineralization pressure carrys out vapour and by the steam between jetting steam caused, using the driving steam of this steam as generator 2 between high pressure.Steam jet ejector is that a kind of structure is simple, mechanical moving component, safe and reliable energy saver, is widely used in multiple fields.
The principle of steam jet ejector is: the high steam (high pressure carrys out gas) of steam jet ejector expands through nozzle 17 and forms high velocity air, mix with low-pressure steam (jetting steam caused), the middle pressure steam of mineralization pressure between high steam and low-pressure steam after hybrid chamber, its essence is and utilize the kinetic energy of high steam to promote the pressure of low-pressure steam.
Illustrate that the heating efficiency of present system is high further by theory calculate below, the obvious beneficial effect of energy-saving and emission-reduction benefit.
If the coefficient of heat supply of former lithium bromide absorption heat pump is COP
1, the mass ratio of induced-to-inducing air of the steam jet ejector ratio of high steam mass flow (low-pressure steam with) is k, then the energy relationship of the combined heat-pump system of the present invention according to Fig. 1, and its coefficient of heat supply can be reduced to:
COP=(1+k)COP
1-k=COP
1+k(COP
1-1)
As can be seen from above-mentioned formula, the coefficient of heat supply of lithium bromide absorption heat pump and the mass ratio of induced-to-inducing air of steam jet ejector larger, then the energy-saving effect of this combined heat-pump is more obvious.The coefficient of heat supply of general mono-potency lithium bromide sorption type heat pump is 1.7, if the mass ratio of induced-to-inducing air of steam jet ejector is 0.5, then the coefficient of heat supply of combined heat-pump can reach 2.05, and energy-conservation amplitude reaches more than 20%.
In sum, the present invention adopts steam jet ejector, the steam utilizing high pressure to come to produce in vapour injection generator and the middle pressure steam that formed, as the driving steam of lithium bromide absorption heat pump, form compound heat pump with steam type injection/lithium bromide absorption, thus realize the efficiency utilization of steam energy.The coefficient of heat supply of this system improves more than 20% than simple lithium bromide absorption heat pump, and energy-saving effect is remarkable;
The present invention not only may be used for heat pump, also can be used for refrigeration system, has broad application prospects in industries such as heating, oil, chemical industry, metallurgy, light industrys.
Claims (7)
1. compound heat pump with steam type injection/lithium bromide absorption, it is characterized in that: comprise and be arranged in absorber (5) and be circumscribed with the evaporimeter (13) of low-temperature heat source pipeline, the liquid outlet of absorber (5) is connected with the generator (2) being built-in with condenser (16) by weak solution pipeline, the outlet of generator (2) is communicated with through the first liquid entrance of concentrated solution pipeline with absorber (5) again, heat supply network pipeline exports heat supply network user to through after absorber (5) and condenser (16) successively, the cryogen outlet of condenser (16) is connected to the first cryogen entrance of evaporimeter (13) by pipeline,
The steam (vapor) outlet of described generator (2) through being connected with the steam jet ejector (1) being circumscribed with high pressure and coming vapor pipeline by jetting steam caused pipeline, the outlet of steam jet ejector (1) be connected with the pipeline through generator (2) bottom discharge hydrophobic;
The liquid outlet of described absorber (5) is provided with fluid reservoir (6), fluid reservoir (6) is divided into two-way, one tunnel is converged through the weak solution pipeline of tapping valve (7) with the exit of solution pump (9), be connected with heat exchanger (14), another road is converged through the concentrated solution pipeline of liquid feed valve (8) with heat exchanger (14) exit again.
2. compound heat pump with steam type injection/lithium bromide absorption according to claim 1, it is characterized in that: described jetting steam caused pipeline is also provided with demister (3), demister (3) is divided into two-way, one tunnel is connected with the second liquid entrance of absorber (5) from the liquid outlet of demister (3), and another road is connected from the steam (vapor) outlet of demister (3) with steam jet ejector (1).
3. compound heat pump with steam type injection/lithium bromide absorption according to claim 2, is characterized in that: the pipeline that the liquid outlet of described demister (3) is connected with the second liquid entrance of absorber (5) is provided with drain valve (4).
4. compound heat pump with steam type injection/lithium bromide absorption according to claim 1, is characterized in that: be provided with for the heat exchanger (14) by weak solution pipeline and concentrated solution pipeline between described absorber (5) and generator (2).
5. compound heat pump with steam type injection/lithium bromide absorption according to claim 4, is characterized in that: the weak solution pipeline of the liquid outlet of described absorber (5) is also provided with solution pump (9).
6. compound heat pump with steam type injection/lithium bromide absorption according to claim 5, is characterized in that: the water intaking valve of outlet successively on refrigerant circuit (11) of hydrophobic pipeline of described generator (2) bottom, water supply tank (10) and water compensating valve (12) are connected with the second cryogen entrance of evaporimeter (13) in absorber (5).
7. compound heat pump with steam type injection/lithium bromide absorption according to claim 6, it is characterized in that: the export pipeline of described evaporimeter (13) is provided with cryogenic fluid pump (15), and the outlet of cryogenic fluid pump (15) is connected with the second cryogen entrance.
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| CN201210493090.3A CN102954617B (en) | 2012-11-27 | 2012-11-27 | Compound heat pump with steam type injection/lithium bromide absorption |
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| CN105276652B (en) * | 2014-05-30 | 2019-02-12 | 国网山西省电力公司电力科学研究院 | A kind of hot flusher of steam exhaust absorption heat pump |
| CN104390388A (en) * | 2014-11-14 | 2015-03-04 | 西安交通大学 | Steam type spraying-dead steam direct absorption type compound heat pump system |
| CN106839503A (en) * | 2017-03-30 | 2017-06-13 | 李澎 | First-class absorption type heat pump based on injector |
| CN107975896B (en) * | 2017-11-07 | 2019-05-07 | 西安交通大学 | A kind of absorption waring and cooling air conditioning system and operational mode of gas-liquid separation injection synergy |
| CN109764326A (en) * | 2018-12-15 | 2019-05-17 | 西安交通大学 | A kind of the lignite base electricity water co-feeding system and working method of integrated absorption heat pump |
| CN110513905B (en) * | 2019-07-26 | 2021-04-02 | 浙江大学宁波理工学院 | Cold and heat combined supply system based on open type absorption cycle |
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| JP3787757B2 (en) * | 2000-12-25 | 2006-06-21 | 株式会社日立ビルシステム | Absorption refrigerator performance recovery method and apparatus |
| CN2681049Y (en) * | 2004-01-17 | 2005-02-23 | 华中科技大学 | Absorption-injection type composite refrigerator |
| CN101788142A (en) * | 2009-05-27 | 2010-07-28 | 王世英 | Steam condensate water recovery treatment and residual-heat utilizing system and method thereof |
| CN101825369A (en) * | 2010-04-02 | 2010-09-08 | 清华大学 | High-efficiency compact high-temperature absorption type heat pump unit |
| CN101975486B (en) * | 2010-10-26 | 2012-09-05 | 北京国电电科院节能技术有限公司 | Dead-stream straight-condensation absorption type heat pump device |
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