CN102997482A - Direct-fired lithium bromide absorption cold-hot water unit for recovering flue gas waste heat under heating working condition - Google Patents

Direct-fired lithium bromide absorption cold-hot water unit for recovering flue gas waste heat under heating working condition Download PDF

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Publication number
CN102997482A
CN102997482A CN2012105528274A CN201210552827A CN102997482A CN 102997482 A CN102997482 A CN 102997482A CN 2012105528274 A CN2012105528274 A CN 2012105528274A CN 201210552827 A CN201210552827 A CN 201210552827A CN 102997482 A CN102997482 A CN 102997482A
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hot water
water
valve
direct
flue gas
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CN2012105528274A
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CN102997482B (en
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江荣方
王炎丽
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Shuangliang Eco Energy Systems Co Ltd
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Shuangliang Eco Energy Systems Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/27Relating to heating, ventilation or air conditioning [HVAC] technologies
    • 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
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

The invention relates to a direct-fired lithium bromide absorption cold-hot water unit for recovering flue gas waste heat under the heating working condition, belonging to the technical field of air conditioning equipment. The cold-hot water unit comprises a direct-fired high pressure generator (1), a low pressure generator (2), a condenser (3), an evaporator (4), an absorber (5), a low temperature solution heat exchanger (6), a high temperature solution heat exchanger (7), a solution pump (21), a refrigerant pump (22), valves and the like. The cold-hot water unit is characterized in that a flue gas condensation heat exchanger (18) is additionally arranged on a flue gas exhaust outlet pipe of the direct-fired high pressure generator and divides a refrigerant pump outlet refrigerant water pipeline into two ways, wherein one way is connected into the evaporator (4) via a refrigerating refrigerant water valve (15), and the other way is connected into the flue gas condensation heat exchanger (18) via a heating refrigerant water valve (14) and then is connected into a pipeline behind the refrigerating refrigerant water valve (15) to converge or is independently connected into the evaporator (4); the cooling water flows through the absorber and the condenser under the refrigerating working condition; and the heating hot water flows through the absorber and the condenser under the heating working condition. The unit can fully recover the flue gas waste heat and improve the efficiency.

Description

The direct-burning lithium bromide absorption cold-hot water assembing group of heating operating mode Mist heat recovering
Technical field
The present invention relates to a kind of direct-burning lithium bromide absorption cold-hot water assembing group.Belong to air conditioner technical field.
Background technology
At present the direct-burning lithium bromide absorption cold-hot water assembing group is made of the pipeline of direct combustion high pressure generator 1, low pressure generator 2, condenser 3, evaporimeter 4, absorber 5, cryogenic fluid heat exchanger 6, high-temperature solution heat exchanger 7, solution by-passing valve 8, refrigerant vapour valve 9, solution pump 21, cryogenic fluid pump 22, valve, control system (not shown) and connecting components as shown in Figure 1.When unit moves in the heating operating mode, concentrated solution by-passing valve and refrigerant vapour valve are opened, cryogenic fluid pump and external system cooling water pump stop, the low-temperature water heating that comes from air conditioner user enters in the heat exchange pipe of evaporator, by the heat of condensation heating of the water vapour of heat exchange pipe external surface direct combustion high pressure generator heat dilute solution generation, temperature is sent to the heating user after raising, solution after the direct combustion high pressure generator is concentrated enter in the absorber with condense after water as refrigerant be mixed into weak solution, be sent to the direct combustion high pressure generator by solution pump and again circulate and heat.Also has at present a kind of direct-burning lithium bromide absorption cold-hot water assembing group as shown in Figure 2, increased hot-water heater 12 such as Fig. 1, when the heating operating mode is moved, the refrigerant vapour valve cuts out, except direct combustion high pressure generator and hot-water heater, other all shuts down, and the refrigerant vapour that is gone out by the direct combustion high pressure generator directly heats the hot water in the heat exchanger tube, refrigerant vapour condenses into water after emitting heat, flows back to the direct combustion high pressure generator again.The direct-burning lithium bromide absorption cold-hot water assembing group is when the heating operating mode, direct combustion high pressure generator exhaust gas temperature is about 155 ℃, contain the part water vapour in the flue gas simultaneously, the water vapour saturation temperature is about 57 ℃, the sensible heat of this part flue gas and the condensation latent heat of water vapour can account for 10% of fuel combustion caloric value, directly advancing at present discharging can't utilize, and causes the waste of a large amount of fume afterheats, produces simultaneously the thermal pollution of discharging.Because the water vapour saturation temperature is suitable in heating operating mode hot water preparing temperature and the flue gas, adopt common direct heat transfer technology to be difficult to reclaim this part waste heat, how fully to recycle obvious heat of smoke and condensation latent heat in the heating operating mode, improve the efficient of direct-burning lithium bromide absorption cold-hot water assembing group under the heating operating mode, realize mixed economy and the social benefit of energy-saving and emission-reduction, become one of important topic of present research.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, can take full advantage of the direct-burning lithium bromide absorption cold-hot water assembing group of smoke evacuation sensible heat and water vapour condensation latent heat when a kind of heating operating mode is provided.
The object of the present invention is achieved like this: a kind of direct-burning lithium bromide absorption cold-hot water assembing group of heating operating mode recovered flue gas condensation waste heat, comprise the direct combustion high pressure generator, low pressure generator, condenser, evaporimeter, absorber, the cryogenic fluid heat exchanger, high-temperature solution heat exchanger, solution pump and cryogenic fluid pump, valve, the pipeline of control system and connecting components etc., it is characterized in that: have additional the flue gas condensing heat exchanger at direct combustion high pressure generator smoke evacuation outlet, cryogenic fluid pump is exported coolant pipeline be divided into two the tunnel, one the tunnel through refrigeration cryogen water valve access evaporimeter, and the pipeline at again access refrigeration cryogen water valve rear portion behind heating cryogen water valve access flue gas condensing heat exchanger, another road converges or accesses separately evaporimeter.Wherein road water as refrigerant enters evaporimeter through refrigeration cryogen water valve during cooling condition, the pipeline at another road water as refrigerant access refrigeration cryogen water valve rear portion after heating cryogen water valve enters the flue gas condensing heat exchanger and heats up converges or enters separately evaporimeter during the heating operating mode, and by outside water system valve switching, cooling water flow is through absorber and condenser when realizing cooling condition, and flow through absorber and condenser of heating hot water heats up during the heating operating mode.
The direct-burning lithium bromide absorption cold-hot water assembing group of heating operating mode Mist heat recovering of the present invention, when externally the hot water line of water system shares identical pipeline with the cold water pipeline, at cold (heat) the water water inlet pipe that advances evaporimeter and advance between the cooling water inlet pipe of absorber the first cross over pipe is arranged, at this first cross over pipe the hot water water intaking valve is set, at the cooling water outlet pipe that goes out condenser and go out between cold (heat) water outlet pipe of evaporimeter the second cross over pipe is set, and at this second cross over pipe hot water effluent's valve being set, the cooling water outlet pipe that goes out condenser behind the second cross over pipe arranges the cooling water outlet valve.
The direct-burning lithium bromide absorption cold-hot water assembing group of heating operating mode Mist heat recovering of the present invention, when externally the hot water line of water system does not share identical pipeline with the cold water pipeline, after advancing the cooling water water intaking valve of absorber, set up one tunnel hot water inlet pipe, and this road hot water inlet pipe the hot water water intaking valve is set; Set up one tunnel hot water outlet pipe at the cooling water outlet pipe that goes out condenser, and this road hot water outlet pipe hot water effluent's valve is set, and the cooling water outlet pipe that goes out condenser behind the hot water outlet pipe of this road arranges the cooling water outlet valve.
The invention has the beneficial effects as follows:
The present invention is by setting up flue gas condensing heat exchanger and above-mentioned brand-new craft flow in direct combustion high pressure generator smoke evacuation outlet, when 55 ℃ of left and right sides of heating hot water, the flue gas exhaust gas temperature is reduced to below 30 ℃, recyclable a large amount of obvious heat of smoke heat and most water vapour condensation latent heat, under the prerequisite that does not increase fuel consumption, make unit heating capacity and heating efficient improve more than 10%.When identical heating load, can reduce fuel consumption and reach more than 10%, reduce operating cost, improve energy utilization rate, and reduced the thermal pollution of smoke evacuation to environment.
To sum up, the present invention can increase substantially the heating efficiency of unit by the recovery to fume afterheat, reduces fuel consumption, realizes good economic benefit and social benefit.
Description of drawings
Fig. 1 is direct-burning lithium bromide absorption cold-hot water assembing group heating operating mode schematic diagram in the past.
Fig. 2 is the direct heating operating mode of direct-burning lithium bromide absorption cold-hot water assembing group direct combustion high pressure generator schematic diagram in the past.
Fig. 3 is the hot water line of direct-burning lithium bromide absorption cold-hot water assembing group external water system of heating operating mode Mist heat recovering of the present invention and the heating operating mode schematic diagram that the cold water pipeline shares identical pipeline.
Fig. 4 is the heating operating mode schematic diagram that hot water line and the cold water pipeline of the direct-burning lithium bromide absorption cold-hot water assembing group external water system of heating operating mode Mist heat recovering of the present invention do not share identical pipeline.
Reference numeral among the figure:
Direct combustion high pressure generator 1, low pressure generator 2, condenser 3, evaporimeter 4, absorber 5, cryogenic fluid heat exchanger 6, high-temperature solution heat exchanger 7, solution by-passing valve 8, refrigerant vapour valve 9, cooling water water intaking valve 10, cold valves 11, hot-water heater 12, hot water water intaking valve 13, heating cryogen water valve 14, refrigeration cryogen water valve 15, hot water effluent's valve 16, cooling water outlet valve 17, flue gas condensing heat exchanger 18, solution pump 21, cryogenic fluid pump 22.
The specific embodiment
As shown in Figure 3, by direct combustion high pressure generator 1, low pressure generator 2, condenser 3, evaporimeter 4, absorber 5, cryogenic fluid heat exchanger 6, high-temperature solution heat exchanger 7, cooling water water intaking valve 10, cold valves 11, hot water water intaking valve 13, heating cryogen water valve 14, refrigeration cryogen water valve 15, hot water effluent's valve 16, cooling water outlet valve 17, flue gas condensing heat exchanger 18, solution pump 21, cryogenic fluid pump 22, the pipeline of control system (not shown) and connecting components, the direct-burning lithium bromide absorption cold-hot water assembing group of a kind of heating operating mode Mist heat recovering that valve etc. consist of, it is on direct-burning lithium bromide absorption cold-hot water assembing group basis in the past, set up flue gas condensing heat exchanger 18 at direct combustion high pressure generator smoke evacuation outlet, cryogenic fluid pump 22 outlet coolant pipelines are divided into two the tunnel, refrigeration cryogen water valve 15 and heating cryogen water valve 14 are set respectively on two road coolant pipelines, during cooling condition wherein one road water as refrigerant enter evaporimeter 4 through refrigeration cryogen water valve 15, the pipeline at another road water as refrigerant access refrigeration cryogen water valve 15 rear portions after heating cryogen water valve 14 enters flue gas condensing heat exchanger 18 and heats up converges or enters separately evaporimeter 4 during the heating operating mode; The hot water line of external water system shares identical pipeline with the cold water pipeline, at cold (heat) the water water inlet pipe that advances evaporimeter 4 and advance between the cooling water inlet pipe of absorber 5 and establish the first cross over pipe, at this first cross over pipe hot water water intaking valve 13 is set, at the cooling water outlet pipe that goes out condenser 3 and go out between cold (heat) water outlet pipe of evaporimeter 4 the second cross over pipe is set, and at this second cross over pipe hot water effluent's valve 16 being set, the cooling water outlet pipe that goes out condenser 3 behind the second cross over pipe arranges cooling water outlet valve 17.
When cooling condition moves, close heating cryogen water valve 14, hot water water intaking valve 13 and hot water effluent's valve 16, open refrigeration cryogen water valve 15, cold valves 11, cooling water water intaking valve 10 and cooling water outlet valve 17, evaporimeter 4 passes into cold water, absorber 5, condenser 3 pass into cooling water, flue gas condensing heat exchanger 18 is not enabled, and unit moves by cooling flow in the past;
When the heating operating mode is moved, open heating cryogen water valve 14, hot water water intaking valve 13 and hot water effluent's valve 16, close refrigeration cryogen water valve 15, cold valves 11, cooling water water intaking valve 10 and cooling water outlet valve 17, heating hot water enters absorber 5 and condenser 3 through 13 series connection of superheated water water intaking valve, enable flue gas condensing heat exchanger 18, unit is still pressed the dual-effect refrigeration process flow operation, after cryogenic coolant water enters the sensible heat and condensation latent heat intensification of flue gas condensing heat exchanger 18 recovered flue gas through heating cryogen water valve 14, enter the cooling of evaporimeter 4 shwoots, the refrigerant vapour that produces enters absorber 5 and is absorbed by concentrated solution, bromize lithium concentrated solution is emitted the heat of condensation of refrigerant vapour, the heating hot water in heating absorption device 4 heat-transfer pipes when absorbing refrigerant vapour.Do not have rear the lifting by cryogenic fluid pump 22 of water as refrigerant cooling of evaporation to enter again flue gas condensing heat exchanger 18 through heating cryogen water valve 14, form closed cycle, continue to reclaim sensible heat and the condensation latent heat of low-temperature flue gas.The hot water that flows out absorber 5 after heating up enters in condenser 3 heat-transfer pipes, absorbs the heat of condensation that direct combustion high pressure generator 1 cryogen condensate water shwoot and low pressure generator 2 produce the secondary refrigerant vapour, is sent to the heating user after the intensification.The water as refrigerant that condenser 3 condenses enters evaporimeter 4, and according to the difference of fume afterheat ratio, the part water as refrigerant enters in absorber 5 bottom solution through evaporimeter 4 water pond overflows, realizes heating demand and reclaims the autobalance that low temperature exhaust heat is loaded.By above-mentioned brand-new craft flow, realize that the low-temperature flue gas of direct combustion high pressure generator discharging is by the water as refrigerant of flue gas condensing heat exchanger with heat transferred low temperature, the heat of water as refrigerant has passed to hot water by the absorption process of solution again, fully recycles sensible heat and the condensation latent heat of low-temperature smoke extraction.
As shown in Figure 4, Fig. 4 is the heating operating mode schematic diagram that hot water line and the cold water pipeline of the direct-burning lithium bromide absorption cold-hot water assembing group external water system of heating operating mode Mist heat recovering of the present invention do not share identical pipeline.It is on the basis of Fig. 3, first and second cross over pipe between cancellation cooling water pipe and cold (heat) water pipe, the hot water line of external water system does not share identical pipeline with the cold water pipeline, after advancing the cooling water inlet pipe valve of absorber 5, set up one tunnel hot water inlet pipe, and this hot water inlet pipe hot water water intaking valve 13 is set; Set up one tunnel hot water outlet pipe at the cooling water outlet pipe that goes out condenser, and this hot water outlet pipe hot water effluent's valve 16 is set, at cooling water pipe cooling water outlet valve 17 is set.During cooling condition, close heating cryogen water valve 14, hot water water intaking valve 13 and hot water effluent's valve 16, open refrigeration cryogen water valve 15, cold valves 11, cooling water water intaking valve 10 and cooling water outlet valve 17, evaporimeter 4 passes into cold water, and absorber 5, condenser 3 pass into cooling water; During the operation of heating operating mode, open heating cryogen water valve 14, hot water water intaking valve 13 and hot water effluent's valve 16, close refrigeration cryogen water valve 15, cold valves 11, cooling water water intaking valve 10 and cooling water outlet valve 17, heating hot water enters absorber 5 and condenser 3 through 13 series connection of superheated water water intaking valve.
Above scheme is applicable to evaporimeter-absorber and can is single hop (shown in the figure), also can is two sections or multistage.

Claims (4)

1. the direct-burning lithium bromide absorption cold-hot water assembing group of a heating operating mode Mist heat recovering, comprise direct combustion high pressure generator (1), low pressure generator (2), condenser (3), evaporimeter (4), absorber (5), cryogenic fluid heat exchanger (6), high-temperature solution heat exchanger (7), solution pump (21) and cryogenic fluid pump (22), valve etc., it is characterized in that: have additional flue gas condensing heat exchanger (18) at direct combustion high pressure generator smoke evacuation outlet, cryogenic fluid pump is exported coolant pipeline be divided into two the tunnel, one the tunnel through refrigeration cryogen water valve (15) access evaporimeter (4), the pipeline at again access refrigeration cryogen water valve (15) rear portion behind heating cryogen water valve (14) access flue gas condensing heat exchanger (18), another road converges or accesses separately evaporimeter (4), cooling water flow is through absorber and condenser during cooling condition, flow through absorber and condenser of heating hot water during the heating operating mode.
2. the direct-burning lithium bromide absorption cold-hot water assembing group of a kind of heating operating mode Mist heat recovering according to claim 1, it is characterized in that: the hot water line of external water system shares identical pipeline with the cold water pipeline, at the hot and cold water water inlet pipe that advances evaporimeter and advance between the cooling water inlet pipe of absorber the first cross over pipe is arranged, at this first cross over pipe hot water water intaking valve (13) is set, at the cooling water outlet pipe that goes out condenser and go out between the hot and cold water outlet pipe of evaporimeter the second cross over pipe is set, and at this second cross over pipe hot water effluent's valve (16) being set, the cooling water outlet pipe that goes out condenser behind the second cross over pipe arranges cooling water outlet valve (17).
3. the direct-burning lithium bromide absorption cold-hot water assembing group of a kind of heating operating mode Mist heat recovering according to claim 1, it is characterized in that: the hot water line of external water system does not share identical pipeline with the cold water pipeline, cooling water inlet pipe behind the cooling water water intaking valve that advances absorber (5) is set up one tunnel hot water inlet pipe, and this road hot water inlet pipe hot water water intaking valve (13) is set; Set up one tunnel hot water outlet pipe at the cooling water outlet pipe that goes out condenser, and this road hot water outlet pipe hot water effluent's valve (16) is set, and the cooling water outlet pipe that goes out condenser behind the hot water outlet pipe of this road arranges cooling water outlet valve (17).
4. according to claim 1 and 2 or the direct-burning lithium bromide absorption cold-hot water assembing group of 3 described a kind of heating operating mode Mist heat recoverings, it is characterized in that: described evaporimeter (4) and absorber (5) are single hop, two sections or multistage.
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103291351A (en) * 2013-05-24 2013-09-11 中国矿业大学 Mining-area distributed-type coal-mine gas extraction thermoelectric cooling poly-generation energy resource system
CN103542592A (en) * 2013-09-28 2014-01-29 昆山市周市溴化锂溶液厂 Direct combustion type lithium bromide absorption cold and hot water unit with heat recycling function
CN105066161A (en) * 2015-07-29 2015-11-18 思安新能源股份有限公司 Condensation heat recovery system
CN107143435A (en) * 2017-06-22 2017-09-08 江苏科技大学海洋装备研究院 The distributed energy resource system and method for work of a kind of LNG Power Vessels
CN107869857A (en) * 2017-11-07 2018-04-03 北京拓首能源科技股份有限公司 One kind is based on the second kind absorption type mixing heat pump
CN108180671A (en) * 2017-12-28 2018-06-19 嘉兴学院 The lithium bromide absorption refrigerating set and control method of afterheat of IC engine driving
CN108397932A (en) * 2018-04-09 2018-08-14 双良节能系统股份有限公司 A kind of environmental protection band health hot water direct-burning type lithium bromide absorption type hot water or cold water's unit
CN108645074A (en) * 2018-05-22 2018-10-12 南京舜国宸智能科技有限公司 Domestic Gas Air-conditioner

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CN103542592A (en) * 2013-09-28 2014-01-29 昆山市周市溴化锂溶液厂 Direct combustion type lithium bromide absorption cold and hot water unit with heat recycling function

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WO1996034236A1 (en) * 1995-04-24 1996-10-31 Milton Meckler Refrigerant enhancer-absorbent concentrator and turbo-charged absorption chiller
KR100423682B1 (en) * 2000-05-26 2004-03-18 캐리어 코포레이션 Absorption cooling system having an improved dilution control apparatus
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103291351A (en) * 2013-05-24 2013-09-11 中国矿业大学 Mining-area distributed-type coal-mine gas extraction thermoelectric cooling poly-generation energy resource system
CN103291351B (en) * 2013-05-24 2015-01-14 中国矿业大学 Mining-area distributed-type coal-mine gas extraction thermoelectric cooling poly-generation energy resource system
CN103542592A (en) * 2013-09-28 2014-01-29 昆山市周市溴化锂溶液厂 Direct combustion type lithium bromide absorption cold and hot water unit with heat recycling function
CN105066161A (en) * 2015-07-29 2015-11-18 思安新能源股份有限公司 Condensation heat recovery system
CN105066161B (en) * 2015-07-29 2018-01-26 思安新能源股份有限公司 Reclaiming system for condensation heat
CN107143435A (en) * 2017-06-22 2017-09-08 江苏科技大学海洋装备研究院 The distributed energy resource system and method for work of a kind of LNG Power Vessels
CN107869857A (en) * 2017-11-07 2018-04-03 北京拓首能源科技股份有限公司 One kind is based on the second kind absorption type mixing heat pump
CN108180671A (en) * 2017-12-28 2018-06-19 嘉兴学院 The lithium bromide absorption refrigerating set and control method of afterheat of IC engine driving
CN108180671B (en) * 2017-12-28 2023-12-19 嘉兴学院 Lithium bromide absorption refrigerating unit driven by waste heat of internal combustion engine and control method
CN108397932A (en) * 2018-04-09 2018-08-14 双良节能系统股份有限公司 A kind of environmental protection band health hot water direct-burning type lithium bromide absorption type hot water or cold water's unit
CN108397932B (en) * 2018-04-09 2024-03-08 双良节能系统股份有限公司 Environment-friendly sanitary hot water direct-fired lithium bromide absorption type cold and hot water unit
CN108645074A (en) * 2018-05-22 2018-10-12 南京舜国宸智能科技有限公司 Domestic Gas Air-conditioner

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