CN102954617A - 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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- CN102954617A CN102954617A CN2012104930903A CN201210493090A CN102954617A CN 102954617 A CN102954617 A CN 102954617A CN 2012104930903 A CN2012104930903 A CN 2012104930903A CN 201210493090 A CN201210493090 A CN 201210493090A CN 102954617 A CN102954617 A CN 102954617A
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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 steam type injection/lithium bromide absorption combined heat-pump.
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 characteristic outward supplying heat that can the strong absorption water vapour under another condition.Because the lithium bromide absorption heat pump is when coming steam pressure to be higher than required driving pressure, because coefficient of heat supply is also insensitive to the pressure variation that drives steam, so coefficient of heat supply is substantially constant; And Tathagata steam pressure is too high when actual motion, can make generator produce the problems such as fouling, corrosion, affects the safe and stable operation of lithium bromide absorption heat pump.
Summary of the invention
The object of the present invention is to provide and a kind ofly can realize that security of system stable operation, steam energy efficiently utilize, the obvious steam type injection/lithium bromide absorption of energy-saving and emission-reduction benefit combined heat-pump.
In order to achieve the above object, the technical solution used in the present invention is: comprise the evaporimeter that is arranged in the absorber and is circumscribed with the low-temperature heat source pipeline, the liquid outlet of absorber links to each other with the generator that is built-in with condenser by the weak solution pipeline, the outlet of generator is communicated with the first liquid entrance of absorber through the concentrated solution pipeline again, the heat supply network pipeline exports the heat supply network user to after passing successively absorber and condenser, 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 by jetting steam caused pipeline be circumscribed with high pressure and come the steam jet ejector of vapor pipeline to be connected, the outlet of steam jet ejector be connected with the pipeline that passes the generator bottom discharge hydrophobic.
Described demister is installed also on the jetting steam caused pipeline, demister is divided into two-way, and one tunnel liquid outlet from demister is connected with the second liquid entrance of absorber, and another road is connected with steam jet ejector from the steam (vapor) outlet of demister.
Be provided with between described absorber and the generator for the heat exchanger by weak solution pipeline and concentrated solution pipeline.
Also be provided with solution pump on the weak solution pipeline of the liquid outlet of described absorber.
The outlet of the hydrophobic pipeline of described generator bottom is connected with the second cryogen entrance of evaporimeter in the absorber through water intaking valve, water supply tank and water compensating valve on the cryogen pipeline successively.
On the export pipeline of described evaporimeter cryogenic fluid pump is installed, and the 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 one tunnel weak solution pipeline through the exit of tapping valve and solution pump converges, and links to each other with heat exchanger again, and another road is converged through the concentrated solution pipeline at liquid feed valve and heat exchanger exit place.
Be provided with drain valve on the liquid outlet of described demister and the pipeline that the second liquid entrance of absorber is connected.
Compared with prior art, beneficial effect of the present invention is:
The present invention utilizes the external high pressure of steam jet ejector to come the high pressure in the vapor pipeline to come the vapour steam that the injection generator produces in steam jet ejector, then change the driving steam (providing the evaporation thermal source to the lithium-bromide solution in the generator) for the lithium bromide absorption heat pump into, thereby consist of steam type injection/lithium bromide absorption combined heat-pump.
Steam jet ejector is a kind of simple in structure, machinery-free moving component, safe and reliable energy saver, is widely used in multiple fields.The high pressure of combined heat-pump of the present invention comes vapour to form high velocity air through nozzle expansion, the low-pressure steam that produces with generator mixes, through the middle pressure steam of mineralization pressure between high steam and low-pressure steam behind the hybrid chamber, its essence is that the kinetic energy that utilizes high steam promotes the pressure of low-pressure steam, make the combined heat-pump of the present invention can safe and stable operation, thereby realize the efficient utilization of steam energy.
Calculating shows that the coefficient of heat supply of steam type injection/lithium bromide absorption combined heat-pump of the present invention improves more than 20% than former lithium bromide absorption heat pump, and the energy-saving and emission-reduction benefit is obvious.
Description of drawings
Fig. 1 is steam type injection/lithium bromide absorption combined heat-pump 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.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, the present invention includes absorber 5 and be arranged on the evaporimeter that is circumscribed with the low-temperature heat source pipeline 13 in the absorber 5, the liquid outlet of absorber 5 links to each other with the generator 2 that is built-in with condenser 16 by the weak solution pipeline, the outlet of generator 2 is communicated with the first liquid entrance of absorber 5 through the concentrated solution pipeline again, wherein, be provided with the heat exchanger 14 by weak solution pipeline and concentrated solution pipeline between absorber 5 and the generator 2, also be provided with solution pump 9 between the weak solution pipeline entrance of the liquid outlet of absorber 5 and heat exchanger 14, the cryogen outlet of condenser 16 is connected to the first cryogen entrance of evaporimeter 13 by pipeline; The heat supply network pipeline exports the heat supply network user to after passing successively absorber 5 and condenser 16, the steam (vapor) outlet of generator 2 through by jetting steam caused pipeline be circumscribed with high pressure and come the steam jet ejector 1 of vapor pipeline to be connected, and at jetting steam caused pipeline demister 3 is installed, demister 3 is divided into two-way, one tunnel liquid outlet from demister 3 is connected with the second liquid entrance of absorber 5, and another road is connected with jetting steam caused pipeline from the steam (vapor) outlet of demister 3.
Consider that the steam that generator produces may carry some lithium-bromide solution drops, for guaranteeing the normal operation of combined heat-pump of the present invention, need to arrange demister 3 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 liquid outlet from demister is connected with the second liquid entrance of absorber 5 by drain valve 4, another road from the steam (vapor) outlet of demister through by jetting steam caused pipeline be circumscribed with high pressure and come the steam jet ejector 1 of vapor pipeline to be connected, the outlet of steam jet ejector 1 is the hydrophobic pipeline through driving steam pipework, generator 2 bottoms and drive the output of steam drainage pipeline again.
Because the part steam that generator 2 produces enters steam jet ejector, so the condensing water flow that condenser 16 produces is lower than the low-pressure steam flow that absorber 5 absorbs.For keeping the water balance of combined heat-pump of the present invention, part need to be driven the hydrophobic of steam and draw back in the evaporimeter 13.
So, the outlet of the hydrophobic pipeline of generator of the present invention 2 bottoms is connected with the second cryogen entrance of absorber 5 interior evaporimeters 13 through water intaking valve 11, water supply tank 10 and water compensating valve 12 on the cryogen pipeline successively, the outlet of evaporimeter 13 through through cryogenic fluid pump 15 with converge the second cryogen entrance of Returning evaporimeter 13 then from water compensating valve 12 pipeline out.
Consider the heat supply network supply water temperature of heat supply network heating customer requirements with variation of ambient temperature, the present invention adopts the mode that becomes 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, change desired driving steam pressure, 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 the tunnel converges through the tapping valve 7 weak solution pipeline with the exit of solution pump 9, then enter in the heat exchanger 14, liquid inlet with generator 2 is connected again, and another road is converged through the concentrated solution pipeline of liquid feed valve 8 with heat exchanger 14 exits, then links to each other with the first liquid entrance of absorber 5;
Combined heat-pump of the present invention unnecessary lithium-bromide solution when low concentration moves is housed in the fluid reservoir 6 of setting of the present invention, when heat supply temperature descends, opens tapping valve 7, increase the aperture of water compensating valve 12 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.
Combined heat-pump operation operation principle of the present invention is as follows:
Referring to Fig. 1, the concentration of lithium-bromide solution is about about 60% in the lithium bromide absorption heat pump course of work of the present invention, and its evaporating temperature is higher about 40 ℃ than pure water.The low-pressure steam that lithium-bromide solution absorption evaporimeter 13 in the absorber 5 is emitted becomes bromize lithium dilute solution, the temperature of hot net water is improved about 40 ℃, then hot net water is rear to user's heat supply along the condenser 16 further heat absorptions that the heat supply network pipeline enters in the generator 2, and the condensate liquid of condenser 16 is also got back in the evaporimeter 13 by pipeline.Bromize lithium dilute solution enters generator 2 through solution pump 9, heat exchanger 14 successively, because the driving steam of generator 2 bottoms is concentrated with the bromize lithium dilute solution in the generator 2, the saturation temperature of the steam that produces is lower about 40 ℃ than bromize lithium dilute solution, and steam carries out heat exchange by condenser 16 and hot net water, then give user's heat supply, the bromize lithium dilute solution simmer down to bromize lithium concentrated solution of this moment.In this course, by absorption and the evaporation of lithium-bromide solution, the low-pressure steam that evaporimeter 13 is produced is converted to the steam of the elevated pressures of generator generation, thereby consists of the heat chemistry compression, and the power of this process is the available energy that drives steam.
Analyzing this process can find out, finishes evaporation as long as the driving steam-energy bromizates the lithium weak solution in generator 2, and then heat pump can move; And lithium-bromide solution equals it at the quantity of steam of generator 2 interior evaporations at absorber 5 systemic quantity of steams, the coefficient of heat supply of this system is 2 in the ideal case, and during actual motion because various losses, its coefficient of heat supply and should value changes the pressure that drives steam and insensitive generally about 1.7.When driving steam pressure and be higher than the required pressure of operation of heat pump, its coefficient of heat supply is substantially constant, and the driving steam of excess pressure can make generator produce the problems such as fouling, corrosion, affect security of system and moves.
For addressing the above problem, the present invention proposes to arrange steam jet ejector 1 in the lithium bromide absorption heat pump, the steam that adopts high pressure to come vapour injection generator to produce, mineralization pressure comes vapour and by the steam between jetting steam caused, with the driving steam of this steam as generator 2 between high pressure.Steam jet ejector is a kind of simple in structure, machinery-free moving component, safe and reliable energy saver, is widely used in multiple fields.
The principle of steam jet ejector is: the high steam of steam jet ejector (high pressure comes gas) expands through nozzle 17 and forms high velocity air, mix with low-pressure steam (by jetting steam caused), through the middle pressure steam of mineralization pressure between high steam and low-pressure steam behind the hybrid chamber, its essence is that the kinetic energy that utilizes high steam promotes the pressure of low-pressure steam.
The below further calculates to illustrate that by theory the heating efficiency of system of the present invention is high, 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 according to the energy relationship of combined heat-pump system of the present invention shown in Figure 1, its coefficient of heat supply can be reduced to:
COP=(1+k)COP
1-k=COP
1+k(COP
1-1)
Can be found out that by 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 are 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, and the mass ratio of induced-to-inducing air of establishing steam jet ejector is 0.5, and 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, utilize high pressure to come the steam that produces in the vapour injection generator and the middle pressure steam that forms as the driving steam of lithium bromide absorption heat pump, consist of steam type injections/lithium bromide absorption combined heat-pump, thus the efficient utilization of realization 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 can 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 (8)
1. steam type injection/lithium bromide absorption combined heat-pump, it is characterized in that: comprise the evaporimeter (13) that is arranged in the absorber (5) and is circumscribed with the low-temperature heat source pipeline, the liquid outlet of absorber (5) links to each other with the generator that is built-in with condenser (16) (2) by the weak solution pipeline, the outlet of generator (2) is communicated with through the first liquid entrance of concentrated solution pipeline with absorber (5) again, the heat supply network pipeline exports the heat supply network user to after passing successively absorber (5) and condenser (16), and 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 by jetting steam caused pipeline be circumscribed with high pressure and come the steam jet ejector (1) of vapor pipeline to be connected, the outlet of steam jet ejector (1) be connected with the pipeline that passes generator (2) bottom discharge hydrophobic.
2. steam type injection/lithium bromide absorption combined heat-pump according to claim 1, it is characterized in that: described demister (3) is installed also on the jetting steam caused pipeline, demister (3) is divided into two-way, one tunnel liquid outlet from demister (3) is connected with the second liquid entrance of absorber (5), and another road is connected with steam jet ejector (1) from the steam (vapor) outlet of demister (3).
3. steam type injection/lithium bromide absorption combined heat-pump according to claim 1 is characterized in that: be provided with between described absorber (5) and the generator (2) for the heat exchanger (14) by weak solution pipeline and concentrated solution pipeline.
4. steam type injection/lithium bromide absorption combined heat-pump according to claim 3 is characterized in that: also be provided with solution pump (9) on the weak solution pipeline of the liquid outlet of described absorber (5).
5. steam type injection/lithium bromide absorption combined heat-pump according to claim 4 is characterized in that: water intaking valve (11), water supply tank (10) and water compensating valve (12) that the outlet of the hydrophobic pipeline of described generator (2) bottom is passed through on the cryogen pipeline successively are connected with the second cryogen entrance of the interior evaporimeter of absorber (5) (13).
6. steam type injection/lithium bromide absorption combined heat-pump according to claim 5, it is characterized in that: cryogenic fluid pump (15) is installed on the export pipeline of described evaporimeter (13), and the outlet of cryogenic fluid pump (15) is connected with the second cryogen entrance.
7. steam type injection/lithium bromide absorption combined heat-pump according to claim 1 or 5, it is characterized in that: the liquid outlet of described absorber (5) is provided with fluid reservoir (6), fluid reservoir (6) is divided into two-way, one tunnel weak solution pipeline through the exit of tapping valve (7) and solution pump (9) converges, link to each other with heat exchanger (14), another road is converged through the concentrated solution pipeline of liquid feed valve (8) with heat exchanger (14) exit again.
8. steam type injection/lithium bromide absorption combined heat-pump according to claim 1 is characterized in that: be provided with drain valve (4) on the liquid outlet of described demister (3) and the pipeline that the second liquid entrance of absorber (5) is connected.
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Cited By (6)
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| 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 |
| CN105276652A (en) * | 2014-05-30 | 2016-01-27 | 国网山西省电力公司电力科学研究院 | Thermal state flushing device of exhaust-steam absorption heat pump |
| CN106839503A (en) * | 2017-03-30 | 2017-06-13 | 李澎 | First-class absorption type heat pump based on injector |
| CN107975896A (en) * | 2017-11-07 | 2018-05-01 | 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 |
| CN110513905A (en) * | 2019-07-26 | 2019-11-29 | 浙江大学宁波理工学院 | A kind of cold-hot combined supply system based on open type absorbent circulation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105276652A (en) * | 2014-05-30 | 2016-01-27 | 国网山西省电力公司电力科学研究院 | Thermal state flushing device of exhaust-steam absorption heat pump |
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| 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 |
| CN110513905A (en) * | 2019-07-26 | 2019-11-29 | 浙江大学宁波理工学院 | A kind of cold-hot combined supply system based on open type absorbent circulation |
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