CN203011002U - Direct-fired lithium bromide absorption type heating and refrigerating unit with smoke valve and used for recovering smoke waste heat - Google Patents

Direct-fired lithium bromide absorption type heating and refrigerating unit with smoke valve and used for recovering smoke waste heat Download PDF

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Publication number
CN203011002U
CN203011002U CN2012207041314U CN201220704131U CN203011002U CN 203011002 U CN203011002 U CN 203011002U CN 2012207041314 U CN2012207041314 U CN 2012207041314U CN 201220704131 U CN201220704131 U CN 201220704131U CN 203011002 U CN203011002 U CN 203011002U
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valve
water
smoke
hot water
direct
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Withdrawn - After Issue
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CN2012207041314U
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Chinese (zh)
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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 utility model relates to a direct-fired lithium bromide absorption type heating and refrigerating unit with a smoke valve and used for recovering smoke waste heat and belongs to the technical field of air conditioning devices. The direct-fired lithium bromide absorption type heating and refrigerating 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), a valve and the like. A smoke discharging outlet tube of the direct-fired high pressure generator is divided into two branches, a refrigerating smoke valve (20) is added on one branch, a heating smoke valve (9) and a smoke condensation heat exchanger (18) are added on the other branch, and finally the two smoke discharging outlet tube branches can be converged or perform discharging separately. An outlet refrigerant water tube of the refrigerant pump is divided into two branches, one branch is connected to the evaporator (4) through a refrigerant water valve (15), the other branch is connected to the smoke condensation heat exchanger (18) through a heating refrigerant water valve (14) and then is connected to a tube at the back portion of the refrigerant water valve (15) to be converted with or be separately connected to the evaporator (4). The unit can completely recover the smoke waste heat and improve the efficiency.

Description

Direct-burning lithium bromide absorption cold-hot water assembing group with the smoke valve Mist heat recovering
Technical field
The utility model 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 as shown in Figure 1, 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.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 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 enters in absorber and the water as refrigerant after condensing is mixed into weak solution, is sent to the direct combustion high pressure generator by solution pump and again circulates and heat.Also has at present a kind of direct-burning lithium bromide absorption cold-hot water assembing group as shown in Figure 2, such as Fig. 1 has increased hot-water heater 12, 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 heat exchanger tube, refrigerant vapour condenses into water after emitting heat, then flows back to the direct combustion high pressure generator.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 155 ℃ of left and right, contain the part water vapour in flue gas simultaneously, the water vapour saturation temperature is 57 ℃ of left and right, 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 water vapour saturation temperature in heating operating mode hot water preparing temperature and flue gas is suitable, adopt common direct heat transfer technology to be difficult to reclaim this part waste heat, how flue gas still can directly discharge when cooling condition, fully recycle obvious heat of smoke and condensation latent heat when 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.
The utility model content
The purpose of this utility model 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 purpose of this utility model is achieved in that a kind of direct-burning lithium bromide absorption cold-hot water assembing group with the smoke valve Mist heat recovering, 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 etc., it is characterized in that: direct combustion high pressure generator smoke evacuation outlet is divided into two the tunnel, during cooling condition, one the tunnel sets up the refrigeration smoke valve, during the heating operating mode, heating smoke valve and flue gas condensing heat exchanger are set up in another road, last two road smoke exhaust pipes converge or discharging separately, cryogenic fluid pump is exported coolant pipeline be divided into two the tunnel, during cooling condition, one the tunnel through refrigeration cryogen water valve access evaporimeter, and during the heating operating mode, the pipeline at the cryogen water valve of access refrigeration again rear portion after heating cryogen water valve access flue gas condensing heat exchanger, another road converges or accesses separately evaporimeter, and during cooling condition cooling water flow is through absorber and condenser, flow through absorber and condenser of heating hot water during the heating operating mode.
the direct-burning lithium bromide absorption cold-hot water assembing group of the utility model band smoke valve Mist heat recovering, the hot water line of external water system and cold water pipeline share identical 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, on 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 the hot and cold water outlet pipe of evaporimeter the second cross over pipe is set, and on this second cross over pipe, hot water effluent's valve is set, on the cooling water outlet pipe that goes out condenser after the second cross over pipe, the cooling water outlet valve is set.
The direct-burning lithium bromide absorption cold-hot water assembing group of the utility model band smoke valve Mist heat recovering, the hot water line of external water system and cold water pipeline do not share identical pipeline, set up one tunnel hot water inlet pipe on cooling water inlet pipe after advancing the cooling water water intaking valve of absorber 5, and on the hot water inlet pipe of this road, the hot water water intaking valve is set; Going out to set up one tunnel hot water outlet pipe on the cooling water outlet pipe of condenser, and on the hot water outlet pipe of this road, hot water effluent's valve is being set, and on the cooling water outlet pipe that goes out condenser after the hot water outlet pipe of this road, the cooling water outlet valve is being set.
The direct-burning lithium bromide absorption cold-hot water assembing group of the utility model band smoke valve Mist heat recovering, described evaporimeter and absorber are single hop, two sections or multistage.
The beneficial effects of the utility model are:
The utility model is by setting up flue gas condensing heat exchanger and smoke valve and above-mentioned brand-new flow process in direct combustion high pressure generator smoke evacuation outlet, the direct discharging of flue gas can reduce the resistance of discharging fume when refrigeration, discharging again after the flue gas exhaust gas temperature is reduced, if heating hot water is when 55 ℃ of left and right, 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 utility model to the recovery of fume afterheat, can increase substantially the heating efficiency of unit during by the heating operating mode, 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 the utility model band smoke valve Mist heat recovering and the heating operating mode schematic diagram that the cold water pipeline shares identical pipeline.
Fig. 4 is 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 the utility model band smoke valve Mist heat recovering do not share the heating operating mode schematic diagram of identical pipeline.
Reference numeral in 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, heating smoke valve 19, refrigeration smoke valve 20, 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, heating smoke valve 19, refrigeration smoke valve 20, solution pump 21, cryogenic fluid pump 22, the pipeline of control system (not shown) and connecting components, a kind of direct-burning lithium bromide absorption cold-hot water assembing group with the smoke valve 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, direct combustion high pressure generator smoke evacuation outlet is divided into two the tunnel, during cooling condition, one the tunnel sets up refrigeration smoke valve 20, during the heating operating mode, heating smoke valve 19 and flue gas condensing heat exchanger 18 are set up in another road, last two road smoke exhaust pipes can converge or discharging separately, 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, during the heating operating mode, 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.The hot water line of external water system and cold water pipeline share identical 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, on 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 on this second cross over pipe, hot water effluent's valve 16 is set, on the cooling water outlet pipe that goes out condenser 3 after the second cross over pipe, cooling water outlet valve 17 is set.
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, close heating smoke valve 19, open refrigeration smoke valve 20, flue gas condensing heat exchanger 18 is not enabled, and unit moves by cooling flow in the past.The flue gas of direct combustion high pressure generator discharging can directly discharge through refrigeration smoke valve 20, need not pass through flue gas condensing heat exchanger 18, and its beneficial effect is that flue gas directly discharges the drag losses that has reduced smoke evacuation.
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, open heating smoke valve 19, close refrigeration smoke valve 20, 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 evaporimeter 4 shwoot coolings, 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 when absorbing refrigerant vapour, heating hot water in heating absorption device 4 heat-transfer pipes.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 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, the low-temperature flue gas of realizing the discharging of heating operating mode direct combustion high pressure generator transfers heat to the water as refrigerant of low temperature by flue gas condensing heat exchanger 18, 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 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 the utility model band smoke valve Mist heat recovering do not share the heating operating mode schematic diagram of identical pipeline.It is on the basis of Fig. 3, cancel first and second cross over pipe between cooling water pipe and cold (heat) water pipe, the hot water line of external water system and cold water pipeline do not share identical pipeline, set up one tunnel hot water inlet pipe after advancing the cooling water inlet pipe valve of absorber 5, and on this hot water inlet pipe, hot water water intaking valve 13 is set; Going out to set up one tunnel hot water outlet pipe on the cooling water outlet pipe of condenser, and hot water effluent's valve 16 is being set on this hot water outlet pipe, going out cooling water outlet valve 17 is set on the cooling water outlet pipe of condenser.During cooling condition, close heating smoke valve 19, heating cryogen water valve 14, hot water water intaking valve 13 and hot water effluent's valve 16, open refrigeration smoke valve 20, 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 smoke valve 19, heating cryogen water valve 14, hot water water intaking valve 13 and hot water effluent's valve 16, close refrigeration smoke valve 20, 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 figure), also can is two sections or multistage.

Claims (4)

1. direct-burning lithium bromide absorption cold-hot water assembing group with the smoke valve 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: direct combustion high pressure generator smoke evacuation outlet is divided into two the tunnel, during cooling condition, one the tunnel sets up refrigeration smoke valve (20), during the heating operating mode, heating smoke valve (19) and flue gas condensing heat exchanger (18) are set up in another road, last two road smoke exhaust pipes converge or discharging separately, cryogenic fluid pump is exported coolant pipeline be divided into two the tunnel, during cooling condition, one the tunnel through refrigeration cryogen water valve (15) access evaporimeter (4), and during the heating operating mode, the pipeline at the cryogen water valve (15) of access refrigeration again rear portion after heating cryogen water valve (14) access flue gas condensing heat exchanger (18), another road converges or accesses separately evaporimeter (4), and during cooling condition cooling water flow is through absorber (5) and condenser (3), flow through absorber (5) and condenser (3) of heating hot water during the heating operating mode.
2. a kind of direct-burning lithium bromide absorption cold-hot water assembing group with the smoke valve Mist heat recovering according to claim 1, it is characterized in that: the hot water line of external water system and cold water pipeline share identical 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, hot water water intaking valve (13) is set on this first cross over pipe, 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 hot water effluent's valve (16) is set on this second cross over pipe, cooling water outlet valve (17) is set on the cooling water outlet pipe that goes out condenser after the second cross over pipe.
3. a kind of direct-burning lithium bromide absorption cold-hot water assembing group with the smoke valve Mist heat recovering according to claim 1, it is characterized in that: the hot water line of external water system and cold water pipeline do not share identical pipeline, set up one tunnel hot water inlet pipe on the cooling water inlet pipe after the cooling water water intaking valve that advances absorber (5), and on the hot water inlet pipe of this road, hot water water intaking valve (13) is set; Going out to set up one tunnel hot water outlet pipe on the cooling water outlet pipe of condenser, and hot water effluent's valve (16) is being set on the hot water outlet pipe of this road, and cooling water outlet valve (17) is being set on the cooling water outlet pipe that goes out condenser after the hot water outlet pipe of this road.
4. according to claim 1 and 2 or 3 described a kind of direct-burning lithium bromide absorption cold-hot water assembing groups with the smoke valve Mist heat recovering, it is characterized in that: described evaporimeter (4) and absorber (5) are single hop, two sections or multistage.
CN2012207041314U 2012-12-19 2012-12-19 Direct-fired lithium bromide absorption type heating and refrigerating unit with smoke valve and used for recovering smoke waste heat Withdrawn - After Issue CN203011002U (en)

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CN2012207041314U CN203011002U (en) 2012-12-19 2012-12-19 Direct-fired lithium bromide absorption type heating and refrigerating unit with smoke valve and used for recovering smoke waste heat

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997496A (en) * 2012-12-19 2013-03-27 双良节能系统股份有限公司 Direct-fired lithium bromide absorption cold-hot water unit provided with flue gas valves and used for recovering flue gas waste heat
CN103486870A (en) * 2013-09-30 2014-01-01 双良节能系统股份有限公司 Smoke waste heat refrigeration and heating supply system of industrial kiln stove
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
CN103759467A (en) * 2014-01-18 2014-04-30 双良节能系统股份有限公司 Two-section smoke hot water single-dual effect composite lithium bromide absorption refrigerating unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997496A (en) * 2012-12-19 2013-03-27 双良节能系统股份有限公司 Direct-fired lithium bromide absorption cold-hot water unit provided with flue gas valves and used for recovering flue gas waste heat
CN102997496B (en) * 2012-12-19 2014-11-12 双良节能系统股份有限公司 Direct-fired lithium bromide absorption cold-hot water unit provided with flue gas valves and used for recovering flue gas waste heat
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
CN103486870A (en) * 2013-09-30 2014-01-01 双良节能系统股份有限公司 Smoke waste heat refrigeration and heating supply system of industrial kiln stove
CN103759467A (en) * 2014-01-18 2014-04-30 双良节能系统股份有限公司 Two-section smoke hot water single-dual effect composite lithium bromide absorption refrigerating unit

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