CN100394122C - Air-preheating bromide-refrigerator fire-tube group cryogen steam regeneration method and device - Google Patents
Air-preheating bromide-refrigerator fire-tube group cryogen steam regeneration method and device Download PDFInfo
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- CN100394122C CN100394122C CNB2006100463206A CN200610046320A CN100394122C CN 100394122 C CN100394122 C CN 100394122C CN B2006100463206 A CNB2006100463206 A CN B2006100463206A CN 200610046320 A CN200610046320 A CN 200610046320A CN 100394122 C CN100394122 C CN 100394122C
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The present invention relates to an air-preheating bromide-refrigerator fire-tube group cryogen steam regeneration method and a device, which belongs to the field of air preheating lithium bromide direct-fired absorption refrigeration. A high-temperature reheater of an air-preheating bromide-refrigerator uses a porous ceramic plane flame burner to directly heat tube bundles arranged in a furnace chamber. The tube bundles are evenly heated, and heat transmission efficiency is enhanced, so that the structure a direct-fired machine is compact, and the arrangement mode of the tube bundles is good for the reduction of the content of NO<x> and CO. Simultaneously, dilute solution is heated and air is preheated by using the reutilization of smoke gas, the heat efficiency of the direct-fired machine is further enhanced, and environmental heat pollution caused by the discharge of the smoke gas is reduced. Compared with the existing lithium bromide direct-fired absorption refrigerator, the air-preheating fire-tube group high-temperature reheating lithium bromide absorption direct-fired machine has the advantages that the volume is reduced by one second, the content of the NO<x> discharged by combustion is lower than 30 ppm, and the content of the CO is reduced to a low level. The present invention is suitable for central air-conditioning systems of various large, medium and small sized buildings and building groups.
Description
Technical field
The invention belongs to air preheat lithium bromide direct fired absorption refrigeration field.
Background technology
Lithium bromide direct fired absorption refrigeration machine directly with combustion gas as the energy; have protection environment, balance combustion gas peak valley, improve electric load rate and the high advantage of efficiency of energy utilization; all obtained development faster in recent years at home and abroad, and be widely used in all kinds of large, medium and small type buildings and the groups of building central air conditioner system.Along with natural gas the popularizing of each department, lithium bromide direct fired absorption refrigeration machine will have the better application prospect.Yet, commercial building for an inch of land is an inch of gold, the bromine cooling machine user always wishes satisfying under the condition of other performance, volume and weight is the smaller the better, to reduce the area and the construction cost of machine room, wish that particularly the air-conditioning unit can be installed in the top layer of building, basement or intermediate layer, this just has higher requirement to the compactedness of unit.Therefore, development lithium bromide direct fired absorption refrigeration machine new and effective, compact conformation has very high commercial value and realistic meaning.The conventional way that improves the combustion apparatus thermal efficiency is to utilize preheated air again with smoke discharging residual heat, and one of main path of the direct-fired absorption refrigerating and heating unit of exploitation ultra-compact is exactly the high pressure generator densification.Recycle the fume emission waste heat as far as possible, combustion system and high temperature reheater stove tube water pipe layout are improved, bromine cooling machine just can reach compact conformation, energy-efficient effect.If adopt porous ceramics flat flame burner directly to heat the tube bank that is arranged in burner hearth, simultaneously, flue gas recycling heat dilute solution, preheated air not only can improve direct combustion machine heat transfer efficiency, make direct combustion machine densification, and the arrangement mode of water pipe also helps reducing NO
x, CO content.The high suction-type lithium bromide again of air preheat fire tube group direct combustion machine, COP can reach 1.5, reduces 1/2, burning and exhausting NO with respect to present lithium bromide direct fired absorption refrigeration body is long-pending
xContent is lower than 30ppm, and CO content also is lowered to very low-level.
Summary of the invention
Purpose of the present invention just provides a kind of direct-burning type lithium bromide absorption type refrigeration machine compact conformationization, high efficiency, low Air thing air discharged preheating bromide-refrigerator fire-tube group cryogen steam regeneration method and device.
Technical solution of the present invention is: the air-preheating bromide-refrigerator fire-tube group cryogen steam regenerating unit, by combustion gas and air mixing chamber 1, blowing-type premixed flat flame burner 11, generator body 12, flue gas heat exchange device 16, air preheater 5, air blast 17 constitutes, and they connect successively is that combustion gas is connected with blowing-type premixed flat flame burner 11 with air mixing chamber 1, blowing-type premixed flat flame burner 11 is connected with heat exchanger shell pass 24 arrival ends of generator body 12, the outlet of the heat exchanger shell pass 24 of generator body 12 is connected with the 16 flue gas flow imports of flue gas heat exchange device, the outlet of flue gas heat exchange device 16 flue gas flows is connected with air preheater 5 flue gas flows inlet, air blast is connected with air preheater 5 air flow processs inlet, air preheater 5 air flow process outlets and combustion gas and air mixing chamber 1 are connected by pipeline; Blowing-type premixed flat flame burner 11 is made of groove form casing 20, distribution plate 21, porous ceramic plate 19, successively distribution plate 21 is welded on blowing-type premixed flat flame burner 11 groove form casings 20 inner surfaces, porous ceramic plate 19 and is attached to the opening of blowing-type premixed flat flame burner 11 groove form casings 20 and is lived by bolting; Described generator body is made of heat exchanger, liquid capsule 2 and drum 3, and the liquid capsule places that the heat exchanger outer wall communicates with the heat exchanger tube side, drum places heat exchanger top also to communicate with the heat exchanger tube side by hiding the liquid plate; The heat exchanger of generator body 12 is divided into tube side and shell side, and tube side is made of last chamber 30, tubulation 26 and following chamber 22, and last chamber 30 and following chamber 22 link together by tubulation 26, fills lithium-bromide solution in the tube side; Generator body 12 heat exchanger shell pass are surrounded by the inner surface of outer cover of the heat exchanger of tubulation 26 outer walls and generator body 12, walk flue gas, shell side axially be divided into light pipe low NOx combustion section 23, low CO generate between dead band 25, light pipe bringing-up section 27, finned tube bringing-up section 28, they connect successively, and to be light pipe low NOx combustion section 23 with dead band 25 between low CO generates is connected, hangs down that dead band 25 is connected with light pipe bringing-up section 27 between the CO generation, light pipe bringing-up section 27 is connected with finned tube bringing-up section 28.
Use the air-preheating bromide-refrigerator fire-tube group cryogen steam regenerating unit to carry out the method for air preheat fire tube group high temperature reheater, be applied in the economic benefits and social benefits direct combustion type lithium bromide cold and hot water machine, air blast 17 is introduced air and is entered air hose 10 through air preheater 5, Gas Pipe 9 introducing combustion gas also enter air hose 10 and mix with air, after mist enters combustion gas and the further abundant mixing of air mixing chamber 1, enter in the blowing-type premixed flat flame burner 11, air-flow is under distribution plate 21 effects in the blowing-type premixed flat flame burner 11, evenly the distribution mist is to porous ceramic plate 19 surfaces, surperficial 19 micropores of the porous ceramic plate of flowing through then, form the flat flame burning at burner 11 porous ceramic plates 19 outer surfaces, the plane combustion flame directly adds the tube bank of light pipe low NOx combustion section 23 of the heat exchanger shell pass of heater body, the flame region heat is rapidly by the tube bank diffusion, suppressed the generation of NOx, combustion high temperature reaction combustion gas dead band 25 realization completing combustions between low CO generates again, reduced the CO discharging, the light pipe bringing-up section 27 of flowing through successively then, finned tube bringing-up section 28, flue gas heat exchange device 16 flue gas flows, air preheater 5 air flow processs, behind the flue, enter in the atmosphere; Weak solution from economic benefits and social benefits direct combustion type lithium bromide cold and hot water machine high-temperature heat exchanger enters flue gas heat exchange device 16 liquid flows by flue gas heat exchange device dilute solution inlet 15, after the further heating of flue gas, enter generator body heat exchanger tube side by flue gas heat exchange device weak solution outlet 8, weak solution continues to be heated, to seethe with excitement, to be condensed into intermediate solution in tubulation, intermediate solution is through liquid capsule 2, enter with intermediate solution outlet 13 high-temperature heat exchangers that are connected in; Weak solution vaporization produces overheated refrigerant vapour, accumulates in the drum 3, then, enters into the low-temperature reheater with the refrigerant vapour outlet 4 economic benefits and social benefits direct combustion type lithium bromide cold and hot water machines that are connected.
Beneficial effect and benefit that the present invention reached are:
1. use the method and apparatus that this patent air preheat fire tube group high temperature reheater produces condensed steam, the thermal efficiency of bromine cooling machine unit obviously improves.
2. use the method and apparatus that this patent fire tube group high temperature reheater produces condensed steam, adopt porous ceramic plate flat flame combustion system, efficiency of combustion improves, and tubulation is heated evenly; Adopt high temperature reheater body heat exchanger tube fire tube group to arrange that heat exchange efficiency improves, the tubulation arrangement mode can effectively suppress combustion process NO
xGeneration with the discharging of pollutants such as CO.
3. adopt flue gas waste heat recovery to utilize heat dilute solution, preheated air, improve efficiency of combustion and generatine set heat efficiency significantly, can reduce the thermal pollution of fume emission simultaneously environment.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural representation of air preheat fire tube group high temperature reheater bromine cooling machine high temperature reheater integral body of the present invention.
Fig. 2 is a high temperature reheater body construction schematic diagram.
Among the figure, 1. combustion gas and air mixing chamber, 2. liquid capsule, 3. drum, 4. refrigerant vapour outlet, 5. air preheater, 6. dilute solution inlet, 7. flue gas heat exchange device exhanst gas outlet, 8. flue gas heat exchange device weak solution outlet, 9. Gas Pipe, 10. air hose, 11. blowing-type premixed flat flame burners, 12. generator body, 13. the intermediate solution outlet, 14. exhanst gas outlets, 15. flue gas heat exchange device dilute solution inlet, 16. flue gas heat exchange device, 17. air blast, 18. mist imports, 19. porous ceramic plates, 20. burner housing, 21. distribution plate, 22. times chambers, 23. low NO
xThe burning bringing-up section, 24. shell sides, dead band between 25. low CO generate, 26. heat exchanger tubes, 27. light pipe sections, 28. finned tubes, 29. flue gases, on 30. the chamber.
The specific embodiment
A kind of flue gas is recycled the high temperature reheater of fire tube group formula lithium bromide direct combustion machine, it is characterized in that, high temperature reheater integral body is by combustion gas and air mixing chamber 1, blowing-type premixed flat flame burner 11, generator body 12, flue gas heat exchange device 16, air preheater 5, air blast 17 constitutes, and they connect successively is that combustion gas is connected with burner 11 with air mixing chamber 1, burner 11 is connected with generator body heat exchanger 12 shell sides 24 arrival ends, the outlet of generator body heat exchanger 12 shell sides 24 is connected with the 16 flue gas flow imports of flue gas heat exchange device, the outlet of flue gas heat exchange device 16 flue gas flows is connected with air preheater 5 flue gas flows, air blast is connected with air preheater 5 air flow processs inlet, air preheater 5 air flow processs outlets and mixing chamber 1 are connected by pipeline.Burner 11 is made of shell 20, distribution plate 21, porous ceramic plate 19, connects distribution plate 21 successively and is welded on shell 20 inner surface correct positions, porous ceramic plate 19 and is attached to the opening of burner 11 groove form casings 20 and is lived by bolting.The generator body is made of heat exchanger, liquid capsule 2 and drum 3, and the liquid capsule places that the heat exchanger outer wall is identical with its tube side, drum places heat exchanger top to communicate with its tube side by hiding the liquid plate.Be divided into tube side and shell side at generator body heat exchanger, tube side is made of last chamber 30, tubulation 26 and following chamber 22, and last chamber 30 and following chamber 22 link together by tubulation 26, fills lithium-bromide solution in the tube side.Generator body heat exchanger shell pass by tubulation 26 outer walls and height again the outer cover of heat exchanger inner surface surround, walk flue gas, shell side axially be divided into light pipe low NOx combustion section 23, low CO generate between dead band 25, light pipe bringing-up section 27, finned tube bringing-up section 28, they connect successively, and to be light pipe low NOx combustion section 23 with dead band 18 between low CO generates is connected, hangs down that dead band 18 is connected with light pipe bringing-up section 20 between the CO generation, light pipe bringing-up section 20 is connected with finned tube bringing-up section 21.
Embodiment one
Air preheat fire tube group high temperature reheater is applied in the 1500RT economic benefits and social benefits direct combustion type lithium bromide cooling-water machine, calorific value 3800kal/Nm
3The town gas flow is at 182Nm
3, calorific value 11000Kcal/Nm
3Gas discharge at 82Kcal/Nm
3Air blast 17 is introduced air and is entered air hose 10 through air preheater 5, Gas Pipe 9 introducing combustion gas also enter air hose 10 and mix with air, after air beyond the above explosion limit of Flammability limits and combustion gas pre-mixed gas enter the further abundant mixing of mixing chamber 1, enter in the burner 11, air-flow is under distribution plate 21 effects in the burner 11, evenly the distribution mist is to porous ceramic plate 19 surfaces, surperficial 19 micropores of the porous ceramic plate of flowing through then, form the flat flame burning at burner 11 porous ceramic plates 19 outer surfaces, the tube bank of the direct heater body heat exchanger shell pass of plane combustion flame light pipe low NOx combustion section 23, the flame region heat is rapidly by the tube bank diffusion, suppressed the generation of NOx, combustion high temperature reaction combustion gas is dead band 25 realization complete oxidations between low CO generates again, reduced the CO discharging, the light pipe bringing-up section 20 of flowing through successively then, finned tube bringing-up section 21, flue gas heat exchange device 16 flue gas flows, air preheater 5 air flow processs, behind the flue, enter in the atmosphere.From the concentration of direct combustion machine high-temperature heat exchanger be 58%, temperature is that 135 ℃ weak solution is by dilute solution inlet 6, enter flue gas heat exchange device 15 liquid flows by flue gas further after the heating, enter high temperature reheater body heat exchanger tube side by weak solution inlet 6, weak solution continues to be heated, to seethe with excitement, to be condensed into concentration 59%, 158 ℃ of intermediate solution of temperature in tubulation, intermediate solution is through liquid capsule 2, enter with intermediate solution outlet 13 high-temperature heat exchangers that are connected in.Weak solution vaporization produces overheated refrigerant vapour, accumulates in the drum 3, then, enters into the low-temperature reheater with the refrigerant vapour outlet 4 direct combustion machines that are connected.
Embodiment two
Air preheat fire tube group high temperature reheater is applied in the 1500RT economic benefits and social benefits direct combustion type lithium bromide warm water machine, calorific value 3800kal/Nm
3The town gas flow is at 182Nm
3, calorific value 11000Kcal/Nm
3Gas discharge at 72Kcal/Nm
3Air blast 17 is introduced air and is entered air hose 10 through air preheater 5, Gas Pipe 9 introducing combustion gas also enter air hose 10 and mix with air, after air beyond the above explosion limit of Flammability limits and combustion gas pre-mixed gas enter the further abundant mixing of mixing chamber 1, enter in the burner 11, air-flow is under distribution plate 21 effects in the burner 11, evenly the distribution mist is to porous ceramic plate 19 surfaces, surperficial 19 micropores of the porous ceramic plate of flowing through then, form the flat flame burning at burner 11 porous ceramic plates 19 outer surfaces, the tube bank of the direct heater body heat exchanger shell pass of plane combustion flame light pipe low NOx combustion section 23, the flame region heat is rapidly by the tube bank diffusion, suppressed the generation of NOx, combustion high temperature reaction combustion gas is dead band 25 realization complete oxidations between low CO generates again, reduced the CO discharging, the light pipe bringing-up section 20 of flowing through successively then, finned tube bringing-up section 21, flue gas heat exchange device 16 flue gas flows, air preheater 5 air flow processs, behind the flue, enter in the atmosphere.From the concentration of direct combustion machine high-temperature heat exchanger be 56%, temperature is that 135 ℃ weak solution is by dilute solution inlet 6, enter flue gas heat exchange device 15 liquid flows by flue gas further after the heating, enter high temperature reheater body heat exchanger tube side by weak solution inlet 6, weak solution continues to be heated, to seethe with excitement, to be condensed into concentration 580%, 1590 ℃ of intermediate solution of temperature in tubulation, intermediate solution is through liquid capsule 2, enter with intermediate solution outlet 13 high-temperature heat exchangers that are connected in.Weak solution vaporization produces overheated refrigerant vapour, accumulates in the drum 3, then, enters into the evaporimeter and the absorber of direct combustion machine through pipeline through refrigerant vapour outlet 4.
Claims (2)
1. air-preheating bromide-refrigerator fire-tube group cryogen steam regenerating unit, it is characterized in that, by combustion gas and air mixing chamber (1), blowing-type premixed flat flame burner (11), generator body (12), flue gas heat exchange device (16), air preheater (5), air blast (17) constitutes, and they connect successively is that combustion gas is connected with blowing-type premixed flat flame burner (11) with air mixing chamber (1), blowing-type premixed flat flame burner (11) is connected with heat exchanger shell pass (24) arrival end of generator body (12), the outlet of the heat exchanger shell pass (24) of generator body (12) is connected with flue gas heat exchange device (16) flue gas flow import, the outlet of flue gas heat exchange device (16) flue gas flow is connected with air preheater (5) flue gas flow inlet, air blast is connected with air preheater (5) air flow process inlet, the outlet of air preheater (5) air flow process is connected by pipeline with air mixing chamber (1) with combustion gas; Blowing-type premixed flat flame burner (11) is made of groove form casing (20), distribution plate (21), porous ceramic plate (19), successively distribution plate (21) is welded on blowing-type premixed flat flame burner (11) groove form casing (20) inner surface, porous ceramic plate (19) and is attached to the opening of blowing-type premixed flat flame burner (11) groove form casing (20) and is lived by bolting; Described generator body is made of heat exchanger, liquid capsule (2) and drum (3), and the liquid capsule places that the heat exchanger outer wall communicates with the heat exchanger tube side, drum places heat exchanger top also to communicate with the heat exchanger tube side by screening liquid plate; The heat exchanger of generator body (12) is divided into tube side and shell side, and tube side is made of last chamber (30), tubulation (26) and following chamber (22), and last chamber (30) and following chamber (22) link together by tubulation (26), fills lithium-bromide solution in the tube side; Generator body (12) heat exchanger shell pass is surrounded by the inner surface of outer cover of the heat exchanger of tubulation (26) outer wall and generator body (12), walk flue gas, shell side axially be divided into light pipe low NOx combustion section (23), low CO generate between dead band (25), light pipe bringing-up section (27), finned tube bringing-up section (28), they connect successively, and to be light pipe low NOx combustion section (23) with dead band (25) between low CO generates is connected, hangs down that dead band (25) is connected with light pipe bringing-up section (27) between the CO generation, light pipe bringing-up section (27) is connected with finned tube bringing-up section (28).
2. use the described air-preheating bromide-refrigerator fire-tube group cryogen steam regenerating unit of claim 1 to carry out the method for air preheat fire tube group high temperature reheater, it is characterized in that, be applied in the economic benefits and social benefits direct combustion type lithium bromide cold and hot water machine, air blast (17) is introduced air and is entered air hose (10) through air preheater (5), Gas Pipe (9) introducing combustion gas also enters air hose (10) and mixes with air, after mist enters combustion gas and the further abundant mixing of air mixing chamber (1), enter in the blowing-type premixed flat flame burner (11), air-flow is under distribution plate (21) effect in the blowing-type premixed flat flame burner (11), evenly the distribution mist is to porous ceramic plate (19) surface, porous ceramic plate (19) surface micropore of flowing through then, form the flat flame burning at burner (11) porous ceramic plate (19) outer surface, the plane combustion flame directly adds the tube bank of light pipe low NOx combustion section (23) of the heat exchanger shell pass of heater body, the flame region heat is rapidly by the tube bank diffusion, suppressed the generation of NOx, combustion high temperature reaction combustion gas dead band (25) realization completing combustion between low CO generates again, reduced the CO discharging, the light pipe bringing-up section of flowing through successively then (27), finned tube bringing-up section (28), flue gas heat exchange device (16) flue gas flow, air preheater (5) air flow process, behind the flue, enter in the atmosphere; Weak solution from economic benefits and social benefits direct combustion type lithium bromide cold and hot water machine high-temperature heat exchanger enters flue gas heat exchange device (16) liquid flow by flue gas heat exchange device dilute solution inlet (15), after the further heating of flue gas, enter generator body heat exchanger tube side by flue gas heat exchange device weak solution outlet (8), weak solution continues to be heated, to seethe with excitement, to be condensed into intermediate solution in tubulation, intermediate solution enters in the high-temperature heat exchanger that is connected with intermediate solution outlet (13) through liquid capsule (2); The weak solution vaporization produces overheated refrigerant vapour, accumulates in (3) in the drum, then, enters into the low-temperature reheater of the economic benefits and social benefits direct combustion type lithium bromide cold and hot water machine that is connected with refrigerant vapour outlet (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100463206A CN100394122C (en) | 2006-04-13 | 2006-04-13 | Air-preheating bromide-refrigerator fire-tube group cryogen steam regeneration method and device |
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|---|---|---|---|
| CNB2006100463206A CN100394122C (en) | 2006-04-13 | 2006-04-13 | Air-preheating bromide-refrigerator fire-tube group cryogen steam regeneration method and device |
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| CN1828182A CN1828182A (en) | 2006-09-06 |
| CN100394122C true CN100394122C (en) | 2008-06-11 |
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| CN109307379A (en) * | 2018-10-11 | 2019-02-05 | 浙江力巨热能设备有限公司 | Ultralow nitrogen lithium bromide absorption refrigerating set |
| CN109654468A (en) * | 2019-01-18 | 2019-04-19 | 广东念智节能科技有限公司 | A kind of steam generation mould group |
| CN109882843A (en) * | 2019-04-16 | 2019-06-14 | 台山市合能陶瓷有限公司 | A kind of inversion type beef steak burner |
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| CN1828182A (en) | 2006-09-06 |
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