CN108507219A - A kind of compound two-stage type lithium bromide absorption type heat pump and working method - Google Patents

A kind of compound two-stage type lithium bromide absorption type heat pump and working method Download PDF

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Publication number
CN108507219A
CN108507219A CN201710112402.4A CN201710112402A CN108507219A CN 108507219 A CN108507219 A CN 108507219A CN 201710112402 A CN201710112402 A CN 201710112402A CN 108507219 A CN108507219 A CN 108507219A
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China
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lithium bromide
heat
absorber
heat pump
evaporator
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CN201710112402.4A
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Chinese (zh)
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张跃
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远大空调有限公司
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Priority to CN201710112402.4A priority Critical patent/CN108507219A/en
Publication of CN108507219A publication Critical patent/CN108507219A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B15/00Sorption machines, plant, or systems, operating continuously, e.g. absorption type
    • F25B15/02Sorption machines, plant, or systems, operating continuously, e.g. absorption type without inert gas
    • F25B15/06Sorption machines, plant, or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B27/00Machines, plant, or systems, using particular sources of energy
    • F25B27/002Machines, plant, or systems, using particular sources of energy using solar energy
    • F25B27/007Machines, plant, or systems, using particular sources of energy using solar energy in sorption type systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B27/00Machines, plant, or systems, using particular sources of energy
    • F25B27/02Machines, plant, or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B33/00Boilers; Analysers; Rectifiers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2500/00Problems to be solved
    • F25B2500/08Exceeding a certain temperature value in a refrigeration component or cycle
    • 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
    • Y02A30/274Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
    • 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
    • Y02B30/625Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration

Abstract

A kind of compound two-stage type lithium bromide absorption type heat pump and working method, wherein lithium bromide absorption type heat pump includes two lithium bromide heat pump units being connected with each other, first lithium bromide heat pump unit includes the first evaporator, the first generator, the first absorber and the first condenser being connected with each other, and the second lithium bromide heat pump unit includes the second evaporator, the second generator, the second absorber and the second condenser being connected with each other;The heat exchanger tube output end of first absorber is connected to the heat exchanger tube of the second absorber, the second condenser, the first condenser successively.The invention also includes a kind of working methods of compound two-stage type lithium bromide absorption type heat pump.One aspect of the present invention can reduce the temperature of unit generator in the case where middle warm water, low temperature water condition are certain, extend unit service life;On the other hand, the steam bleeding range for expanding unit advantageously reduces Unit Selection, reduces cost;And unit manufacture is very convenient.

Description

A kind of compound two-stage type lithium bromide absorption type heat pump and working method

Technical field

The present invention relates to air conditioner technical field, especially a kind of compound two-stage type lithium bromide absorption type heat pump and work Make method.

Background technology

Heat pump market is since homogeneity is than more serious at present, and the difference in parameter determines low temperature exhaust heat yield, in turn Influence total investment and the investment payback time of entire project.If under the same conditions, driving heat source grade demand it is lower or Person's hot water temperature's higher all plays decisive action in the project.

For example, in 20/30 DEG C of water at low temperature, traditional absorption type heat pump assembly is used under conditions of 40/90 DEG C of middle warm water, Flow is as shown in Figure 1:40 DEG C of middle warm water is heated to 90 DEG C after absorber and condenser successively, and in condenser in heating Heat source needed for warm water comes from generator, this just needs to input the higher driving heat source of grade, i.e. steam pressure in generator It is required that up to arriving 0.6MPa, 155 DEG C of generator temperature, the pressure and temperature is higher, can have the following defects:(1)It is unfavorable for machine The longtime running of group, and generator hot soak condition, can reduce the service life of unit in this way;(2)Unit steam bleeding model Enclose very small, Unit Selection can be bigger than normal, reduces generatine set heat efficiency, increases cost, can also occupied ground.

Invention content

One kind is provided and can be run steadily in the long term the purpose of the present invention is overcoming the above-mentioned insufficient of the prior art, uses the longevity Life length, steam bleeding range is big, small, easily fabricated compound two-stage type lithium bromide absorption type heat pump and working method.

The technical scheme is that:

A kind of compound two-stage type lithium bromide absorption type heat pump of the present invention, includes two lithium bromide heat pump machines of interconnection Group, the first lithium bromide heat pump unit include the first evaporator being connected with each other, the first generator, the first absorber and the first condensation Device, the second lithium bromide heat pump unit include the second evaporator being connected with each other, the second generator, the second absorber and the second condensation Device;The heat exchanger tube output end of first absorber successively with the second absorber, the heat exchanger tube of the second condenser, the first condenser Connection.

Further, the heat exchanger tube output end of second evaporator is connected to the heat exchanger tube input terminal of the first evaporator.

Further, first generator and the second generator are separately connected driving heat source pipeline, in driving heat source pipeline It is passed through driving heat source;The driving heat source is steam, hot water, natural gas or flue gas etc.;When driving heat source is high-temperature-hot-water, drive Dynamic heat source is introduced into the first generator, enters back into the second generator;When for other type of heat source, first, can be respectively enterd Two generators.

Further, the second evaporator corresponds to the high temperature section of water at low temperature, and the first evaporator corresponds to the low-temperature zone of water at low temperature, and second The evaporating pressure of evaporator is more than the evaporating pressure of the first evaporator.

Further, the steam (vapor) outlet of first evaporator is connected to the steam inlet of the first absorber, second evaporation The steam (vapor) outlet of device is connected to the steam inlet of the second absorber, makes the lithium bromide concentrated solution in the first absorber and the second absorber It absorbs refrigerant vapour and becomes weak solution, while releasing absorption heat.

Further, the temperature of the weak solution in second absorber and concentration are higher than the temperature of weak solution in the first absorber Degree and concentration.

Wherein, high-temperature-hot-water above-mentioned, middle warm water, water at low temperature are the proprietary term of field of air conditioning, suction-type lithium bromide heat Pump is with high temperature heat(Such as steam, high-temperature-hot-water, combustion gas)For power, low-temperature heat source is recycled(Such as spent hot water, often referred to as low temperature Hot water)Heat, produce the hot water of higher temperature(Referred to as middle warm water)For heating or technique etc..Lithium bromide absorption type heat pump In concept, a high temperature not instead of absolute concept, for low-temperature water heating, middle warm water.

A kind of working method of compound two-stage type lithium bromide absorption type heat pump of the present invention, includes two of interconnection Lithium bromide heat pump unit, includes the following steps:

(1)Lithium bromide concentrated solution in first absorber of the first lithium bromide heat pump unit absorbs the cryogen in the first evaporator and steams Vapour becomes weak solution, while releasing absorption heat, and the middle warm water in the first absorber heat exchanging pipe is made to carry out level-one heating;

(2)In the heat exchanger tube for the second absorber that middle warm water after level-one heating enters the second lithium bromide heat pump unit, second inhales It receives refrigerant vapour of the absorption of the lithium bromide concentrated solution in device from the second evaporator and becomes weak solution, while releasing absorption heat, make Middle warm water in second absorber heat exchanging pipe carries out two level heating;

(3)Middle warm water after two level heating enters in the heat exchanger tube of the second condenser, is put through the refrigerant vapour in the second condenser Go out to absorb heat, the middle warm water in the second condenser heat-exchange pipes is made to carry out three-level heating;

(4)Middle warm water after three-level heating enters in the heat exchanger tube of the first condenser, is put through the refrigerant vapour in the first condenser Go out to absorb heat, so that the middle warm water in the first condenser heat-exchange pipes is carried out level Four heating, obtain hot water;

(5)Export hot water.

Preferably, above-mentioned steps specifically include:

(1)Lithium bromide concentrated solution in first absorber of the first lithium bromide heat pump unit absorbs the cryogen in the first evaporator and steams Vapour becomes weak solution, while releasing absorption heat, makes the middle warm water in the first absorber heat exchanging pipe(T DEG C of inlet temperature)Carry out level-one Heating heats up 6 ~ 15 DEG C, outlet temperature T+(6~15)℃;

(2)In the heat exchanger tube for the second absorber that middle warm water after level-one heating enters the second lithium bromide heat pump unit, second inhales It receives refrigerant vapour of the absorption of the lithium bromide concentrated solution in device from the second evaporator and becomes weak solution, while releasing absorption heat, make Middle warm water in second absorber heat exchanging pipe carries out two level heating, heats up 6 ~ 15 DEG C, outlet temperature T+(12~30)℃;

(3)Middle warm water after two level heating enters in the heat exchanger tube of the second condenser, is put through the refrigerant vapour in the second condenser Go out to absorb heat, so that the middle warm water in the second condenser heat-exchange pipes is carried out three-level heating, heat up 4 ~ 10 DEG C, outlet temperature T+(16~ 40)℃;

(4)Middle warm water after three-level heating enters in the heat exchanger tube of the first condenser, is put through the refrigerant vapour in the first condenser Go out to absorb heat, so that the middle warm water in the first condenser heat-exchange pipes is carried out level Four and heat up 4 ~ 10 DEG C, obtain hot water, outlet temperature T+ (20~50)℃;

(5)Export hot water.

Further, step(1)、(2)In, the refrigerant vapour is by the cryogen in the first evaporator, the second evaporator After water draws the heat that low-temperature heat source pipeline provides, evaporate, and the second evaporator corresponds to the high temperature section of water at low temperature, first Evaporator corresponds to the low-temperature zone of water at low temperature.The water at low temperature comes from combustion gas(Coal)The flue gas waste heat recovery of boiler, technique productions Or the recycling of the low temperature waste heat waters such as steam power plant.

Further, the weak solution in first absorber and the second absorber is sent to the first generator and second respectively Generator carries out heating concentration, becomes concentrated solution and returns to respective absorber.

Further, the pressure in first generator is more than the pressure in the second generator;Pressure in first evaporator Power is less than the pressure in the second evaporator.Driving heat source is determined by the demand of the first generator.

Further, step(3)、(4)In, drive is respectively adopted in the refrigerant vapour in first condenser, the second condenser Dynamic heat source heating lithium-bromide solution generates, and when driving heat source is hot water, is introduced into the first generator and enters back into the second generator.

Further, first lithium bromide absorption type heat pump with the second lithium bromide absorption type heat pump in each corresponding heat exchanger (As the first generator corresponds to the second generator)In heat exchange amount can be the same or different.

Beneficial effects of the present invention:

1)The temperature of the first generator and the second generator can be reduced, energy consumption is saved, improves the service life of device;

2)Compared with traditional approach, generator temperature of the present invention declines about 10 DEG C, and steam pressure declines about 0.15MPa, reduces The requirement of driving heat source(When heat pump boundary condition changes, cooling extent also and then changes);

3)The steam bleeding range expansion of unit is twice, and is advantageously reduced Unit Selection, is reduced cost;

4)The internal process of unit is varied without, water system need to be only changed, unit manufacture is very convenient.

In short, one aspect of the present invention can reduce unit generator in the case where middle warm water, low temperature water condition are certain Temperature(Reduce driving heat source grade demand), extend unit service life(Or driving heat source and low temperature water condition are certain In the case of, the outlet temperature of middle warm water is greatly improved, to improve waste heat recovery volume);On the other hand, expand the steam bleeding model of unit It encloses, advantageously reduces Unit Selection, reduce cost;And unit manufacture is very convenient.

Description of the drawings

Fig. 1 is the structural schematic diagram of the prior art;

Fig. 2 is the structural schematic diagram of the embodiment of the present invention;

Fig. 3 is another structural schematic diagram of the embodiment of the present invention.

Specific implementation mode

The present invention is described in further details below with reference to Figure of description and specific embodiment.

As shown in Figure 2:A kind of compound two-stage type lithium bromide absorption type heat pump includes two lithium bromide heat of interconnection Pump assembly, the first lithium bromide heat pump unit include the first evaporator, the first generator, the first absorber and first being connected with each other Condenser, the second lithium bromide heat pump unit include the second evaporator, the second generator, the second absorber and second being connected with each other Condenser;The heat exchanger tube output end of first absorber successively with the second absorber, the heat exchanger tube of the second condenser, the first condenser Connection.The heat exchanger tube output end of second evaporator is connected to the heat exchanger tube input terminal of the first evaporator.

First generator and the second generator are separately connected driving heat source pipeline, and driving heat is passed through in driving heat source pipeline Source.Driving heat source can be natural gas, steam, high-temperature-hot-water or flue gas to heat bromination in the first generator and the second generator Lithium solution generates refrigerant vapour.As shown in Figure 2:When driving heat source is natural gas, steam or flue gas etc., driving heat source can be distinguished Into the first generator and the second generator.As shown in figure 3, when driving heat source is high-temperature-hot-water, advanced first generator is again Into the second generator.

Specifically, due to the present embodiment be in order to ensure the middle warm water in the first absorber heat exchanging pipe successively pass through second Temperature when absorber, the second condenser and the first condenser is in increasing trend, to obtain hot water, therefore the present embodiment and biography The single unit of system is compared, and the requirement of driving heat source can be reduced, and the temperature of driving heat source can be less than needed for traditional single unit The temperature of heat source;Or it is identical in remaining hot water and driving heat source, the present embodiment can improve the heat supply temperature of hot water.

The heat exchanger tube output end of second evaporator is connected to the heat exchanger tube input terminal of the first evaporator, and the second evaporator changes Low-temperature heat source is passed through in the heat exchanger tube of heat pipe and the first evaporator, low-temperature heat source can be combustion gas(Coal)More than the low-temperature flue gas of boiler Heat can also be low temperature waste heat water(Such as cooling water)Waste heat recovery.Low-temperature heat source pipeline first pass through the second evaporator using First evaporator.

The steam (vapor) outlet of first evaporator is connected to the steam inlet of the first absorber, the steam (vapor) outlet connection of the second evaporator The steam inlet of second absorber makes the lithium bromide concentrated solution in the first absorber and the second absorber absorb refrigerant vapour and becomes Weak solution, while releasing absorption heat.

Temperature and concentration of the temperature and concentration of weak solution in second absorber higher than weak solution in the first absorber.

For example the working method and principle of bright the present embodiment below:

As shown in Figure 2:Advanced second evaporator of water at low temperature is cooled to 25 DEG C by 30 DEG C, then is cooled to 20 DEG C into the first evaporator. The evaporating temperature of second evaporator is 23 DEG C, is higher than 18 DEG C of temperature in the first evaporator and conventional rack evaporator, reduces by the The concentration of two absorbers is conducive to the operation of the second lithium bromide absorption type heat pump.

Lithium bromide concentrated solution in first absorber absorbs refrigerant vapour and becomes weak solution, while releasing absorption heat, makes the 40 DEG C of middle warm water in one absorber heat exchanging pipe is heated to 50.5 DEG C, and warm water export in traditional lithium bromide absorption type heat pump 60.5 DEG C, the two differs 10 DEG C, advantageously reduces solution concentration in the first absorber.

Middle warm water, which through the second absorber is warming up to 61 DEG C by 50.5 DEG C and enters back into the second condenser, is warming up to 75.5 DEG C, with biography System lithium bromide absorption type heat pump compares the condensation temperature for reducing the second condenser, thereby reduces the temperature of the second generator.

It is involved in the present invention to unit two heat pump units can be analyzed to not only independent operating but also connect each other.First bromine Change the medium temperature water outlet temperature in the first absorber of lithium heat pump unit(50.5℃)Well below conventional suction formula heat pump unit Outlet temperature(61℃);The evaporating temperature of second evaporator of the second lithium bromide heat pump unit(23℃)With middle warm water output temperature (75.5℃)Far below conventional suction formula heat pump unit evaporating temperature(18℃)With middle warm water output temperature(90℃).

These conditions are all conducive to the operation of unit, optimize the operating parameter inside unit.Final shows as reducing The temperature of unit generator(I.e. to the requirement of driving heat source grade).

In the present embodiment, the steam pressure in the first generator is up to 0.45MPa, the temperature highest in the first generator 146℃;Steam pressure in second generator is up to 0.4MPa, 141.6 DEG C of the temperature highest in the second generator.And it is traditional When using separate unit lithium bromide heat pump unit, the steam pressure in generator is 0.6MPa, and generator temperature is 155 DEG C, with tradition Mode is compared, and the present embodiment greatly reduces the requirement of driving heat source, and generator temperature declines about 10 DEG C, and steam pressure declines About 0.15MPa.

In the present embodiment, the steam bleeding range of unit expands 1 times, is conducive to improve generatine set heat efficiency, reduces Unit Selection, subtracts Few cost, increases the market competitiveness.

The low-temperature heat source pipeline of the present embodiment comes from combustion gas(Coal)The flue gas waste heat recovery of boiler or the low temperature of steam power plant Cooling water heat recovery etc., using steam(Or other heat sources)As driving heat source recycle the heat of low-temperature heat source for heat supply or Condensate preheats or other heat demands aspect, and is easy to be transformed, and varies without the internal process of unit, only need to change water system i.e. Can, unit manufacture is very convenient.

In conclusion the present embodiment has the following advantages:

(1)Identical in low temperature water condition and hot water conditions, can reduce generator temperature reduces driving heat source It is required that unit is more adaptable, while unit is run at relatively low temperature, improves the service life of device;

(2)It is identical in driving heat source and low-temperature heat source, the supply water temperature of unit hot water can be improved, to improve machine The ability of group recycling low temperature exhaust heat, increases the economic benefit of project;

(3)Unit expands steam bleeding range, is conducive to improve the thermal efficiency, reduces Unit Selection, reduces cost;

(4)The internal process of unit is varied without, water system need to be only changed, unit manufacture is very convenient.

Claims (10)

1. a kind of compound two-stage type lithium bromide absorption type heat pump, which is characterized in that two lithium bromide heat including interconnection Pump assembly, the first lithium bromide heat pump unit include the first evaporator, the first generator, the first absorber and first being connected with each other Condenser, the second lithium bromide heat pump unit include the second evaporator, the second generator, the second absorber and second being connected with each other Condenser;The heat exchanger tube output end of first absorber is changed with the second absorber, the second condenser, the first condenser successively Heat pipe is connected to.
2. compound two-stage type lithium bromide absorption type heat pump according to claim 1, which is characterized in that second evaporation The heat exchanger tube output end of device is connected to the heat exchanger tube input terminal of the first evaporator.
3. compound two-stage type lithium bromide absorption type heat pump according to claim 2, which is characterized in that described first occurs Device and the second generator are separately connected driving heat source pipeline, and driving heat source is passed through in driving heat source pipeline;The driving heat source is Steam, hot water, natural gas or flue gas;When driving heat source is hot water, driving heat source is introduced into the first generator, enters back into second Generator.
4. compound two-stage type lithium bromide absorption type heat pump according to claim 1 or 2 or 3, which is characterized in that described The steam (vapor) outlet of one evaporator is connected to the steam inlet of the first absorber, and the steam (vapor) outlet connection second of second evaporator is inhaled The steam inlet for receiving device makes the lithium bromide concentrated solution in the first absorber and the second absorber absorb refrigerant vapour and becomes dilute molten Liquid, while releasing absorption heat.
5. compound two-stage type lithium bromide absorption type heat pump according to claim 1 or 2 or 3, which is characterized in that described Temperature and concentration of the temperature and concentration of weak solution in two absorbers higher than weak solution in the first absorber.
6. a kind of working method of compound two-stage type lithium bromide absorption type heat pump, which is characterized in that two including interconnection Platform lithium bromide heat pump unit, includes the following steps:
(1)Lithium bromide concentrated solution in first absorber of the first lithium bromide heat pump unit absorbs the cryogen in the first evaporator and steams Vapour becomes weak solution, while releasing absorption heat, and the middle warm water in the first absorber heat exchanging pipe is made to carry out level-one heating;
(2)In the heat exchanger tube for the second absorber that middle warm water after level-one heating enters the second lithium bromide heat pump unit, second inhales It receives refrigerant vapour of the absorption of the lithium bromide concentrated solution in device from the second evaporator and becomes weak solution, while releasing absorption heat, make Middle warm water in second absorber heat exchanging pipe carries out two level heating;
(3)Middle warm water after two level heating enters in the heat exchanger tube of the second condenser, is put through the refrigerant vapour in the second condenser Go out to absorb heat, the middle warm water in the second condenser heat-exchange pipes is made to carry out three-level heating;
(4)Middle warm water after three-level heating enters in the heat exchanger tube of the first condenser, is put through the refrigerant vapour in the first condenser Go out to absorb heat, so that the middle warm water in the first condenser heat-exchange pipes is carried out level Four heating, obtain hot water;
(5)Export hot water.
7. the working method of compound two-stage type lithium bromide absorption type heat pump according to claim 6, which is characterized in that step (1)、(2)In, the refrigerant vapour is to draw low-temperature heat source pipeline by the water as refrigerant in the first evaporator, the second evaporator to carry It after the heat of confession, evaporates, and the second evaporator corresponds to the high temperature section of water at low temperature, the first evaporator corresponds to the low of water at low temperature Temperature section.
8. the working method of compound two-stage type lithium bromide absorption type heat pump described according to claim 6 or 7, which is characterized in that Weak solution in first absorber and the second absorber is sent to the first generator respectively and the second generator is heated Concentration becomes concentrated solution and returns to respective absorber.
9. the working method of compound two-stage type lithium bromide absorption type heat pump described according to claim 6 or 7, which is characterized in that Pressure in first generator is more than the pressure in the second generator;Pressure in first evaporator is less than the second evaporator Interior pressure.
10. the working method of compound two-stage type lithium bromide absorption type heat pump described according to claim 6 or 7, which is characterized in that Step(3)、(4)In, driving heat source heating lithium bromide is respectively adopted in the refrigerant vapour in first condenser, the second condenser Solution generates, and when driving heat source is hot water, is introduced into the first generator and enters back into the second generator.
CN201710112402.4A 2017-02-28 2017-02-28 A kind of compound two-stage type lithium bromide absorption type heat pump and working method CN108507219A (en)

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