CN209415824U - A kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit - Google Patents
A kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit Download PDFInfo
- Publication number
- CN209415824U CN209415824U CN201822207873.6U CN201822207873U CN209415824U CN 209415824 U CN209415824 U CN 209415824U CN 201822207873 U CN201822207873 U CN 201822207873U CN 209415824 U CN209415824 U CN 209415824U
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- China
- Prior art keywords
- water
- refrigerant
- lithium bromide
- direct
- temperature cold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 180
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 title claims abstract description 62
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 27
- 239000003507 refrigerant Substances 0.000 claims abstract description 109
- 238000001704 evaporation Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000002775 capsule Substances 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 239000000446 fuel Substances 0.000 claims abstract description 8
- 239000012808 vapor phase Substances 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 239000006096 absorbing agent Substances 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000012071 phase Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000003034 coal gas Substances 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 239000000295 fuel oil Substances 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- CUZMQPZYCDIHQL-VCTVXEGHSA-L calcium;(2s)-1-[(2s)-3-[(2r)-2-(cyclohexanecarbonylamino)propanoyl]sulfanyl-2-methylpropanoyl]pyrrolidine-2-carboxylate Chemical compound [Ca+2].N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1.N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1 CUZMQPZYCDIHQL-VCTVXEGHSA-L 0.000 claims 1
- 238000009736 wetting Methods 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 abstract 1
- 229940059936 lithium bromide Drugs 0.000 description 21
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002528 anti-freeze Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Abstract
The utility model relates to a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water units, belong to technical field of refrigeration equipment.The unit includes evaporating temperature sensor (12), the unit driving heat source is fuel, unit is also additionally arranged water as refrigerant denseness on-line detection device, the device is provided with water as refrigerant inner cylinder (16) in water as refrigerant outer cylinder (17), two bottom is concordant, there are vapor phase spaces on top, outer cylinder bottom water as refrigerant is into being equipped with metering hole at outer bobbin (14), inner cylinder bottom is gone back to liquid capsule pipe (13) with water as refrigerant and is connect, it is connect at the top of outer cylinder with water as refrigerant balance pipe (18), cryogen water pressure sensor (15) are arranged in outer cylinder lower part.Present apparatus energy automatic on-line detects cryogen water density, and then in safe range by water as refrigerant density domination, unit is made to be constantly in optimal operational condition.
Description
Technical field
The utility model relates to air conditioner technical fields, more particularly to a kind of on-line checking density direct combustion type lithium bromide
Absorption type low-temperature water cooler.
Background technique
Common direct-fired lithium bromide absorption type cold water unit such as Fig. 1 are to produce 7 DEG C or more of cold water for air conditioner user
Or production technology uses, the water as refrigerant temperature safety value general control recycled inside such unit is at 3 DEG C or more, and unit exists
When debugging for the first time or finding refrigerating capacity deficiency in running, need to detect cryogen water density.Detection cryogen water density generallys use people
The method of work sampling sees that scale reads data with densimeter measurement, once discovery cryogen water density is greater than 1.04g/ml or more, depending on
To be mixed into lithium-bromide solution in refrigerant pollution, that is, water as refrigerant, water as refrigerant just needs to bypass regeneration, until cryogen watertight
Degree is less than 1.002g/ml, and water as refrigerant just meets unit requirement.
But the direct-burning type lithium bromide absorption type low-temperature cold water unit for producing 0 DEG C or so cold water, antifreeze is key,
Anti-icing fluid can be added in external system cold water to reduce the freezing point of water, and the cryogen coolant-temperature gage recycled inside unit can be than outside
Cold water temperature of uniting is lower, in order to reduce cryogen water freezing point, often uses the method that lithium-bromide solution is added into water as refrigerant, and cold
The content of lithium-bromide solution needs to control in a certain range according to cryogen coolant-temperature gage in agent water, can shadow if cryogen water density is too big
Refrigerating capacity is rung, if the too small risk for having icing of cryogen water density, so, direct-burning type lithium bromide absorption type low-temperature cold water unit exists
Real-time automatic on-line detection cryogen water density is needed in operation.How cryogen water density could be detected by automatic on-line in real time, improve peace
Full reliability makes unit be in optimal operational condition, and can save unit cost, and it is low to become current direct-burning type lithium bromide absorption type
One of the important topic of warm water cooler research.
Utility model content
Purpose of the utility model is to overcome the above-mentioned shortcomings and provide it is a kind of can make unit be in optimal operational condition, at
Sheet and low, a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit.
The utility model aim is achieved in that a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water
Unit, including direct combustion high pressure generator, low pressure generator, condenser, evaporator, absorber, cryogenic fluid heat exchanger, high temperature
Solution heat exchanger, solution pump, cryogenic fluid pump, weak solution by-passing valve and evaporating temperature sensor, it is characterised in that: the unit drives
Dynamic heat source is fuel, and fuel can be natural gas, artificial coal gas, light oil and heavy oil etc., and direct combustion high pressure generator is the wet back of water pipe
Formula, it is intermediate solution that weak solution, which enters concentration in direct combustion high pressure generator, and the refrigerant vapour of generation enters low pressure generator heat transfer
Water as refrigerant is condensed into pipe, intermediate solution enters in low pressure generator after high-temperature solution heat exchanger and weak solution heat exchange to be concentrated
For concentrated solution, the refrigerant vapour of generation, which enters outside condenser thermal transfer pipe, is condensed into water as refrigerant, and concentrated solution is through cryogenic fluid heat exchange
Enter spray, water as refrigerant in absorber after device and weak solution heat exchange to enter evaporator evaporation endothermic and produce low-temperature cold water, the unit
It is additionally arranged water as refrigerant denseness on-line detection device, which includes that water as refrigerant returns liquid capsule pipe, cryogen
Water is into outer bobbin, cryogen water pressure sensor, water as refrigerant inner cylinder, water as refrigerant outer cylinder, water as refrigerant balance pipe and control system etc., institute
It states and is provided with water as refrigerant inner cylinder in water as refrigerant outer cylinder, the water as refrigerant outer cylinder is concordant with water as refrigerant inner cylinder bottom, there are vapour on top
Phase space, water as refrigerant outer cylinder bottom water as refrigerant is into being equipped with metering hole, water as refrigerant inner cylinder bottom and cryogen at outer bobbin
Water returns liquid bladder tube connection, connect at the top of the water as refrigerant outer cylinder with water as refrigerant balance pipe, and the setting of water as refrigerant outer cylinder lower part is cold
Agent water pressure sensor.The corresponding evaporating pressure out of evaporating temperature measured with evaporating temperature sensor.
Described device further includes evaporating pressure sensor, the evaporating pressure sensor be arranged at the top of water as refrigerant outer cylinder or
Evaporator tube vapour phase area.Evaporating pressure is directly measured with evaporating pressure sensor.
The direct-burning type lithium bromide absorption type low-temperature cold water unit is overlapping type.
The cooling water is series connection.
The cooling water is in parallel.
The present apparatus draws water as refrigerant all the way from cryogen pump discharge pipe and through water as refrigerant enters water as refrigerant outer cylinder bottom into outer bobbin,
Water as refrigerant overflow in outer cylinder enters water as refrigerant inner cylinder, then returns liquid capsule pipe from evaporator liquid capsule is flowed into through water as refrigerant by liquid level difference, presses
This process constantly recycles.Water as refrigerant liquid level is definite value in outer cylinder, and water as refrigerant variable density surveys cryogen water pressure sensor
Pressure change therewith, cold water outlet temperature variation measure evaporating pressure sensor evaporating pressure change therewith (or steaming
The corresponding evaporating pressure out of the evaporating temperature that hair temperature sensor measures changes therewith), the cryogen water pressure measured subtracts vapor pres- sure
Power is equal to on-line checking cryogen differential water pressures, and cryogen differential water pressures correspond to cryogen water density, and the calculation formula and corresponding relationship are inputted
Program is controlled, unit itself touch screen directly displays out cryogen water density, will according to water as refrigerant Auto-regulating System of Density of Heavy Medium weak solution by-passing valve
Water as refrigerant density domination is in safe range.
The beneficial effects of the utility model are:
The utility model realizes that automatic on-line detects water as refrigerant by above-mentioned increased water as refrigerant denseness on-line detection device
Density, according to water as refrigerant Auto-regulating System of Density of Heavy Medium weak solution by-passing valve by water as refrigerant density domination in safe range, make unit be in most
Good operating status, and " on-line densimeter " that the water as refrigerant denseness on-line detection device cost is on sale well below market, measurement
Precision is high, and vacuum leakproofness is good.Water as refrigerant denseness on-line detection device can make direct-burning type lithium bromide absorption type low-temperature cold water unit
Overall cost reduces, and security reliability improves, and solves antifreeze critical issue, makes lithium bromide adsorption water chilling unit product line
Extend, the field of application is wider.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of common direct-burning type lithium bromide absorption type low-temperature cold water unit.
Fig. 2 is a kind of another kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit of the utility model
The structural schematic diagram of embodiment.
Fig. 3 is another of a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit of the utility model
The structural schematic diagram of embodiment.
Fig. 4 is that a kind of structure of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit of the utility model is shown
It is intended to.
In figure:
Direct combustion high pressure generator 1, low pressure generator 2, condenser 3, evaporator 4, absorber 5, cryogenic fluid heat exchanger
6, high-temperature solution heat exchanger 8, solution pump 9, cryogenic fluid pump 10, weak solution by-passing valve 11, evaporating temperature sensor 12, water as refrigerant return
Liquid capsule pipe 13, water as refrigerant are into outer bobbin 14, cryogen water pressure sensor 15, water as refrigerant inner cylinder 16, water as refrigerant outer cylinder 17, water as refrigerant
Balance pipe 18, evaporating pressure sensor 19, cooling water inlet A, cooling water outlet B, fuel combustion C, smoke outlet D, low-temperature cold water
Entrance C, low-temperature cold water export D.
Specific embodiment
The utility model is illustrated in the following with reference to the drawings and specific embodiments:
Embodiment 1:
As shown in Fig. 2, a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit, including direct combustion high pressure
Generator 1, low pressure generator 2, condenser 3, evaporator 4, absorber 5, cryogenic fluid heat exchanger 6, pyrosol heat exchange
Device 8, solution pump 9, cryogenic fluid pump 10, weak solution by-passing valve 11 and evaporating temperature sensor (12), it is characterised in that: the unit drives
Dynamic heat source is fuel, and fuel can be natural gas, artificial coal gas, light oil and heavy oil etc., and direct combustion high pressure generator 1 is the wet back of water pipe
Formula, it is intermediate solution that weak solution, which enters concentration in direct combustion high pressure generator 1, and the refrigerant vapour of generation enters the biography of low pressure generator 2
Water as refrigerant is condensed into heat pipe, intermediate solution enters in low pressure generator 2 after high-temperature solution heat exchanger 8 and weak solution heat exchange
Concentration is concentrated solution, and the refrigerant vapour of generation, which enters outside 3 heat-transfer pipe of condenser, is condensed into water as refrigerant, and concentrated solution is through cryogenic fluid heat
Enter spray, water as refrigerant in absorber 5 after exchanger 6 and weak solution heat exchange to enter 4 evaporation endothermic of evaporator and produce low-temperature cold water,
The unit is additionally arranged water as refrigerant denseness on-line detection device, which includes that water as refrigerant returns liquid capsule pipe
13, water as refrigerant is into outer bobbin 14, cryogen water pressure sensor 15, water as refrigerant inner cylinder 16, water as refrigerant outer cylinder 17, water as refrigerant balance pipe
18, evaporating pressure sensor 19 and control system etc. are provided with water as refrigerant inner cylinder 16, the cryogen in the water as refrigerant outer cylinder 17
Water outer cylinder 17 is concordant with 16 bottom of water as refrigerant inner cylinder, top is there are vapor phase space, the 17 bottom water as refrigerant of water as refrigerant outer cylinder into
Metering hole is equipped at outer bobbin 14,16 bottom of water as refrigerant inner cylinder is returned liquid capsule pipe 13 with water as refrigerant and connect, outside the water as refrigerant
17 top of cylinder is connect with water as refrigerant balance pipe 18, and cryogen water pressure sensor 15 is arranged in 17 lower part of water as refrigerant outer cylinder, described
Evaporating pressure sensor 19 is set at the top of water as refrigerant outer cylinder 17.
In above scheme, the direct-burning type lithium bromide absorption type low-temperature cold water unit is overlapping type.
In above scheme, the cooling water is series connection or parallel connection.
Embodiment 2:
As shown in figure 3, in another embodiment, the evaporating pressure sensor 19 is arranged in evaporator tube vapour phase
Area.
Embodiment 3:
As shown in figure 4, the evaporating pressure sensor 19 is not provided in another embodiment, passed with evaporating temperature
The corresponding evaporating pressure out of the evaporating temperature that sensor 12 measures.
The present apparatus draw from 10 outlet of cryogenic fluid pump all the way water as refrigerant through water as refrigerant into outer bobbin 14 enter water as refrigerant outer cylinder
Bottom, the water as refrigerant overflow in outer cylinder enter water as refrigerant inner cylinder 16, then return liquid capsule pipe 13 through water as refrigerant by liquid level difference and evaporate from flowing into
Device liquid capsule constantly recycles.Water as refrigerant liquid level is definite value in outer cylinder, and water as refrigerant variable density makes cryogen water pressure sensor 15
The cryogen water pressure measured changes therewith, and low-temperature cold water outlet temperature changes the evaporating pressure for measuring evaporating pressure sensor 19
Variation (or the corresponding evaporating pressure out of evaporating temperature that evaporating temperature sensor 12 measures changes therewith) therewith, the water as refrigerant measured
Pressure subtracts evaporating pressure equal to on-line checking cryogen differential water pressures, and cryogen differential water pressures correspond to cryogen water density, by the calculation formula
With corresponding relationship input control program, unit itself touch screen directly displays out cryogen water density, according to water as refrigerant Auto-regulating System of Density of Heavy Medium
In safe range by water as refrigerant density domination, reliability improves weak solution by-passing valve 11, direct-burning type lithium bromide absorption type low temperature
Water cooler is at optimal operational condition.
In addition to the implementation, the utility model further includes having other embodiments, all to use equivalents or equivalent
The technical solution that alternative is formed, should all fall within the protection scope of the utility model claims.
Claims (5)
1. a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit, including it is direct combustion high pressure generator (1), low
Press generator (2), condenser (3), evaporator (4), absorber (5), cryogenic fluid heat exchanger (6), pyrosol heat exchange
Device (8), solution pump (9), cryogenic fluid pump (10), weak solution by-passing valve (11) and evaporating temperature sensor (12), it is characterised in that: institute
Stating unit driving heat source is fuel, and fuel is natural gas, artificial coal gas, light oil or heavy oil, and direct combustion high pressure generator (1) is water pipe
Wetting back-type, it is intermediate solution that weak solution, which enters concentration in direct combustion high pressure generator (1), and the refrigerant vapour of generation enters low pressure
Water as refrigerant is condensed into device (2) heat-transfer pipe, intermediate solution enters low pressure behind high-temperature solution heat exchanger (8) and weak solution heat exchange
Concentration is concentrated solution in generator (2), and the refrigerant vapour of generation, which enters outside condenser (3) heat-transfer pipe, is condensed into water as refrigerant, dense molten
Liquid enters spray, water as refrigerant in absorber (5) behind cryogenic fluid heat exchanger (6) and weak solution heat exchange and enters evaporator (4)
Evaporation endothermic produces low-temperature cold water, which is also additionally arranged water as refrigerant denseness on-line detection device, which examines online
Surveying device includes that water as refrigerant returns liquid capsule pipe (13), water as refrigerant into outer bobbin (14), cryogen water pressure sensor (15), water as refrigerant
Cylinder (16), water as refrigerant outer cylinder (17), water as refrigerant balance pipe (18) and control system are provided in the water as refrigerant outer cylinder (17) cold
Agent water inner cylinder (16), the water as refrigerant outer cylinder (17) is concordant with water as refrigerant inner cylinder (16) bottom, there are vapor phase spaces on top, described
Water as refrigerant outer cylinder (17) bottom water as refrigerant is into being equipped with metering hole, water as refrigerant inner cylinder (16) bottom and cryogen at outer bobbin (14)
Water returns liquid capsule pipe (13) connection, connect at the top of the water as refrigerant outer cylinder (17) with water as refrigerant balance pipe (18), outside the water as refrigerant
Cylinder (17) lower part setting cryogen water pressure sensor (15).
2. a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit according to claim 1, special
Sign is: described device further includes evaporating pressure sensor (19), and the evaporating pressure sensor (19) is arranged outside water as refrigerant
At the top of cylinder (17) or evaporator tube vapour phase area.
3. a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit according to claim 1 or 2,
Be characterized in that: the direct-burning type lithium bromide absorption type low-temperature cold water unit is overlapping type.
4. a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit according to claim 1 or 2,
Be characterized in that: the cooling water of direct-burning type lithium bromide absorption type low-temperature cold water unit is series connection.
5. a kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit according to claim 1 or 2,
Be characterized in that: the cooling water of direct-burning type lithium bromide absorption type low-temperature cold water unit is in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822207873.6U CN209415824U (en) | 2018-12-27 | 2018-12-27 | A kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822207873.6U CN209415824U (en) | 2018-12-27 | 2018-12-27 | A kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209415824U true CN209415824U (en) | 2019-09-20 |
Family
ID=67939230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822207873.6U Withdrawn - After Issue CN209415824U (en) | 2018-12-27 | 2018-12-27 | A kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209415824U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458755A (en) * | 2018-12-27 | 2019-03-12 | 双良节能系统股份有限公司 | A kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit |
-
2018
- 2018-12-27 CN CN201822207873.6U patent/CN209415824U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458755A (en) * | 2018-12-27 | 2019-03-12 | 双良节能系统股份有限公司 | A kind of on-line checking density direct-burning type lithium bromide absorption type low-temperature cold water unit |
| CN109458755B (en) * | 2018-12-27 | 2024-04-02 | 双良节能系统股份有限公司 | On-line detection density direct-fired lithium bromide absorption type low-temperature water chilling unit |
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