CN114704972A - Carbon dioxide cold-carrying unit for artificial stratum freezing system - Google Patents
Carbon dioxide cold-carrying unit for artificial stratum freezing system Download PDFInfo
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- CN114704972A CN114704972A CN202210450347.0A CN202210450347A CN114704972A CN 114704972 A CN114704972 A CN 114704972A CN 202210450347 A CN202210450347 A CN 202210450347A CN 114704972 A CN114704972 A CN 114704972A
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- carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or 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
- 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]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a carbon dioxide cold carrying unit for an artificial stratum freezing system.A liquid cooling oil cooler, an oil filter, a lubricating oil pump and a single-stage screw compressor are sequentially connected with an oil separator; the outlet of the single-stage screw compressor is opened and connected with the air inlet of the oil separator. The oil separator is connected with a water-cooled condenser, the water-cooled condenser is connected with an economizer, the economizer is connected with a condensing evaporator, and an air outlet of the condensing evaporator is connected with a starting single-stage screw compressor; the pipeline that returns from freezing pipe is connected with the carbon dioxide cistern, and carbon dioxide cistern gas outlet is connected with condensation evaporator air inlet, and condensation evaporator liquid outlet and carbon dioxide cistern return the liquid mouth and be connected, and carbon dioxide cistern liquid outlet is connected with carbon dioxide canned motor pump. The unit is a safe, environment-friendly, energy-saving and effective carbon dioxide refrigerating unit, and has more remarkable technical effect when being applied to an artificial stratum freezing system taking carbon dioxide as refrigerating medium.
Description
Technical Field
The invention relates to a refrigerating unit which is used for an artificial stratum freezing system and takes carbon dioxide as a secondary refrigerant.
Background
The artificial stratum freezing is to freeze water in the stratum by using a refrigeration technology, change natural rock soil into frozen soil, increase the strength and stability of the frozen soil, and facilitate the excavation and construction of tunnels, vertical shafts or underground engineering under the protection of a frozen wall.
Among the existing freezing methods, the most common and widely applied method is to freeze by using a calcium chloride aqueous solution as a refrigerating medium. The freezing of the calcium chloride aqueous solution has certain problems of efficiency and construction cost. To overcome the drawbacks of this method, artificial formation freezing systems have been developed that use carbon dioxide as a coolant. For example, chinese utility model patent publication No. CN214573874U discloses an "artificial formation freezing system using low-temperature carbon dioxide circulation refrigeration". The system comprises a first cycle, a second cycle and a third cycle, wherein the nature of the second cycle is a compression refrigeration cycle. The disclosed technology mainly has the following defects:
firstly, during the "second cycle" of the refrigerant cooling system, the on-way resistance and the local resistance of the refrigerant are large, and the resistance can cause the refrigerant to be gasified after being condensed into liquid and before entering the throttling valve, the pressure is reduced to be lower than the saturation pressure corresponding to the temperature, so that the refrigerant flow is changed, and finally the cooling effect of the carbon dioxide is adversely affected.
Secondly, in the process of the second cycle, after the refrigerant is evaporated into a gas state after absorbing heat, the refrigerant can flow together with unevaporated refrigerant liquid, so that the suction and liquid carrying of the compressor are caused, and then the compressor is seriously damaged.
Thirdly, the carbon dioxide liquid is conveyed to the freezing pipe through a pump, and the change of the volume ratio of the carbon dioxide gas to the liquid cannot be adapted to the load change of the freezing pipe. Since the pump delivery is multiple cycles, i.e., the delivered carbon dioxide mass flow rate is greater than the mass flow rate required for the freezing tube load, a mixture of carbon dioxide gas and liquid is returned from the freezing tube. Carbon dioxide liquid that need not be condensed directly gets into the liquefaction structure, can occupy heat transfer area, influences heat exchange efficiency.
At present, no formed unit product or scheme with satisfactory effect exists, and the unit product or scheme can be safely, effectively and practically applied to an artificial stratum freezing system using carbon dioxide as a secondary refrigerant.
Disclosure of Invention
The invention aims to solve the technical problem of providing a safe, environment-friendly, energy-saving and effective carbon dioxide refrigerating unit which is applied to an artificial stratum freezing system using carbon dioxide as a refrigerating medium.
The technical scheme of the invention is as follows:
the utility model provides a carbon dioxide carries cold unit for artificial stratum system of freezing, is including opening single-stage screw compressor, oil piping system, economic ware, water-cooled condenser, condensation evaporimeter, carbon dioxide receiver, carbon dioxide canned motor pump and control system, oil piping system includes oil separator, liquid cooling oil cooler, oil filter and lubricating oil pump, its characterized in that:
the oil outlet of the oil separator is connected with the oil inlet of the liquid cooling oil cooler, the oil outlet of the liquid cooling oil cooler is connected with the inlet of an oil filter, the outlet of the oil filter is connected with the inlet of a lubricating oil pump, and the outlet of the lubricating oil pump is connected with a single-stage screw compressor which is started;
the outlet of the opened single-stage screw compressor is connected with the air inlet of the oil separator, the air outlet of the oil separator is connected with the air inlet of the water-cooled condenser, the liquid outlet of the water-cooled condenser is connected with the liquid inlet of the economizer, the liquid outlet of the economizer is connected with the liquid inlet of the condensation evaporator, and the air outlet of the condensation evaporator is connected with the opened single-stage screw compressor;
the pipeline that returns from freezing the pipe is connected with carbon dioxide cistern inlet, and carbon dioxide cistern gas outlet is connected with condensation evaporator air inlet, and condensation evaporator liquid outlet and carbon dioxide cistern return the liquid mouth and be connected, and carbon dioxide cistern liquid outlet is connected with carbon dioxide shield pump, supplies liquid carbon dioxide to freezing the pipe through carbon dioxide shield pump.
Preferably, the economizer adopts a dry shell-and-tube heat exchanger and is provided with a temperature transmitter, a pressure transmitter and an electronic expansion valve; the control system is used for controlling the liquid supply of the economizer refrigerant, so that the refrigerant liquid is subcooled to increase the cooling capacity.
Preferably, the condensation evaporator adopts a full liquid shell-and-tube heat exchanger, is provided with a liquid level transmitter and an electronic expansion valve, and controls the liquid supply of the evaporator refrigerant through a control system to realize the cooling of gaseous carbon dioxide to liquid state.
Preferably, the carbon dioxide liquid reservoir is provided with a liquid level transmitter and a pressure transmitter, and the carbon dioxide shielding pump is controlled to start and stop by a control system, so that liquid carbon dioxide is supplied to the freezing pipe.
The invention has the positive effects that:
the unit comprises an oil circuit system which forcibly supplies oil to the compressor through an oil pump, so that the problem of lubrication of running parts of the compressor is solved; on the other hand, the lubricating oil can cool the refrigerant after compression to a certain degree, so that the temperature after compression is within the tolerable range of the compressor.
The unit contains the economic ware, can cool off into the refrigerant of liquid to the lower temperature through the economic ware, even there is the resistance in the circulation, the pressure of refrigerant also can be far higher than the saturation pressure that the temperature corresponds, just also can not produce gasification before getting into the choke valve, can not cause adverse effect to the cooling effect of carbon dioxide, can increase the refrigerating capacity of compressor under the same operating mode condition on the contrary.
The condensing evaporator of the unit adopts a flooded structure, a separation space is arranged in a shell pass, and the condensing evaporator has a refrigerant gas-liquid separation function. The condition of liquid carrying can not occur when the compressor sucks air.
The unit comprises a carbon dioxide liquid receiver, a separation space is arranged in the top of the liquid receiver, and the carbon dioxide liquid-gas separation function is achieved. On one hand, enough carbon dioxide liquid storage amount in front of the carbon dioxide pump is ensured to adapt to the load change of the freezing pipe; on the other hand, the problem of gas-liquid separation after the carbon dioxide returns from the freezing pipe is solved, and only the carbon dioxide enters the condensation evaporator to fully exchange heat.
Drawings
Fig. 1 is a schematic flow chart of a carbon dioxide chiller according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a carbon dioxide chiller according to an embodiment of the present invention.
In the figure, 1, a single-stage screw compressor is started, 2, an oil separator, 3, a water-cooled condenser, 4, a first liquid level transmitter, 5, a condensation evaporator, 6, a second pressure transmitter, 7, a second liquid level transmitter, 8, a carbon dioxide shielding pump, 9, a carbon dioxide liquid receiver, 10, a first electronic expansion valve, 11, an economizer, 12, a second electronic expansion valve, 13, a temperature transmitter, 14, a first pressure transmitter, 15, an oil cooler, 16, an oil filter, 17 and a lubricating oil pump.
Detailed Description
The invention is described below with reference to the following examples and figures, which are only used to explain the invention and are not intended to limit the scope of the invention as claimed.
Referring to fig. 1 and 2, the carbon dioxide cold-carrying unit for the artificial formation freezing system comprises an open single-stage screw compressor 1, an oil separator 2, a liquid cooling oil cooler 15, an oil filter 16, a lubricating oil pump 17, an economizer 11, a water cooling condenser 3, a condensation evaporator 5, a carbon dioxide liquid reservoir 9 and a carbon dioxide shield pump 8.
Lubricating oil side: an oil phase outlet of the oil separator 2 is connected with a shell pass inlet of a liquid cooling oil cooler 15 through a pipeline, a shell pass outlet of the liquid cooling oil cooler 15 is connected with an inlet of an oil filter 16, an outlet of the oil filter 16 is connected with an inlet of a lubricating oil pump 17, and an outlet of the lubricating oil pump 17 is connected with the opened single-stage screw compressor 1.
The first outlet of the shell side of the water-cooled condenser 3 is connected with the tube side inlet of the liquid-cooled oil cooler 15 through a pipeline, and the first inlet of the shell side of the water-cooled condenser 3 is connected with the tube side outlet of the liquid-cooled oil cooler 15 through a pipeline.
Refrigerant side: an outlet of the single-stage screw compressor 1 is connected with an oil separator 2, a gas phase outlet of the oil separator 2 is connected with a gas inlet of a water-cooled condenser 3, a second outlet of a shell pass of the water-cooled condenser 3 is connected with a liquid inlet of an economizer 11, a liquid outlet of the economizer 11 is connected with a shell pass liquid inlet of a condensation evaporator 5, and a shell pass gas outlet of the condensation evaporator 5 is connected with a gas suction port of the single-stage screw compressor 1.
Carbon dioxide side: the pipeline that returns from freezing pipe is connected with carbon dioxide cistern 9 inlet, and carbon dioxide cistern 9 gas outlet is connected with the tube side air inlet of condensation evaporator 5, and the tube side liquid outlet of condensation evaporator 5 is connected with carbon dioxide cistern 9 liquid return mouth, and carbon dioxide cistern 9 liquid outlet is connected with carbon dioxide shield pump 8, supplies liquid carbon dioxide to freezing pipe through carbon dioxide shield pump 8.
The economizer 11 employs a dry shell-and-tube heat exchanger and is equipped with a temperature transmitter 13, a first pressure transmitter 14 and a second electronic expansion valve 12.
The condensation evaporator 5 adopts a full liquid shell-and-tube heat exchanger and is provided with a first liquid level transmitter 4 and a first electronic expansion valve 10.
The carbon dioxide reservoir 9 is equipped with a second liquid level transmitter 7 and a second pressure transmitter 6.
The tube side of the water-cooled condenser 3 is connected with a cooling water inlet and outlet tube. The tube side discharge port of the economizer 11 is connected with an air supplement port of the single-stage screw compressor 1 through a pipeline.
The workflow of this embodiment will be explained below.
Refrigerant side:
and starting the single-stage screw compressor 1 to suck the refrigerant from the shell pass of the condensation evaporator 5, so that the pressure of the refrigerant in the shell pass of the condensation evaporator 5 is reduced, and the corresponding saturation temperature is reduced to-50 ℃. The refrigerant sucked into the single-stage screw compressor 1 is compressed to become high-pressure and high-temperature refrigerant gas, and is discharged into the oil separator 2 together with the lubricating oil. The mixture of refrigerant gas and lubricating oil is subjected to oil-gas separation in the oil separator 2, and the lubricating oil sinks to the bottom of the oil separator 2. The refrigerant gas is discharged from the oil separator 2, enters the shell pass of the water-cooled condenser 3, exchanges heat with cooling water in the tube pass of the water-cooled condenser 3, and is cooled into refrigerant liquid with high pressure and high temperature of 40 ℃ by the water. The refrigerant liquid is discharged from the shell side of the water cooled condenser 3 and enters the shell side of the economizer 11. A stream of refrigerant liquid is branched from the shell pass of the economizer 11, throttled and decompressed into a low-pressure refrigerant gas-liquid two-phase mixture at the temperature of minus 25 ℃ by a second electronic expansion valve 12, and then enters the tube pass of the economizer 11. The refrigerant of 40 ℃ on the shell side of the economizer 11 exchanges heat with the refrigerant of-25 ℃ on the tube side of the economizer 11, the refrigerant liquid on the shell side of the economizer 11 is cooled into the refrigerant liquid of-20 ℃, the refrigerant on the tube side of the economizer 11 is gasified and discharged from the tube side of the economizer 11 to enter the starting single-stage screw compressor 1. The refrigerant liquid cooled to-20 ℃ on the shell side of the economizer 11 is discharged from the shell side of the economizer 11, passes through a first electronic expansion valve 10, is throttled and decompressed into a refrigerant gas-liquid two-phase mixture with low pressure and-50 ℃, and then enters the shell side of the condensation evaporator 5. The refrigerant liquid at minus 50 ℃ in the shell side of the condenser-evaporator 5 exchanges heat with the carbon dioxide gas in the tube side of the condenser-evaporator 5 and is gasified. The condensation evaporator 5 adopts a full liquid shell-and-tube heat exchanger, a separation space is arranged in a shell pass, the shell pass has a refrigerant gas-liquid separation function, and the gasified refrigerant gas is sucked by starting the single-stage screw compressor 1 to complete the circulation.
Lubricating oil side:
the lubricating oil sinking into the oil separator 2 is discharged from the oil separator 2, enters the shell side of the liquid-cooled oil cooler 15, exchanges heat with the refrigerant with the temperature of 40 ℃ in the tube side of the liquid-cooled oil cooler 15, and is cooled to 50 ℃. The 50 ℃ lubricating oil is discharged from the liquid cooling oil cooler 15, filtered by the oil filter 16, pressurized by the lubricating oil pump 17 and pumped into the single-stage screw compressor 1 for lubrication, cooling and the like. And then discharged into the oil separator 2 together with the refrigerant gas, completing the cycle. The liquid cooling oil cooler 15 cools lubricating oil by adopting a refrigerant, and refrigerant liquid at 40 ℃ enters the tube side of the liquid cooling oil cooler 15 from the shell side of the water cooling condenser 3, is changed into refrigerant gas at 40 ℃ after exchanging heat with the lubricating oil, and enters the shell side of the water cooling condenser 3 again.
Carbon dioxide side:
the carbon dioxide gas in the tube pass of the condensation evaporator 5 exchanges heat with the refrigerant liquid at minus 50 ℃ in the shell pass of the condensation evaporator 5, and the carbon dioxide gas is cooled to be the carbon dioxide liquid at minus 45 ℃, discharged from the tube pass of the condensation evaporator 5 and enters the carbon dioxide liquid receiver 9 for buffering. Carbon dioxide liquid at-45 ℃ is discharged from a carbon dioxide liquid receiver 9 and is conveyed to the end freezing pipe under pressure through a carbon dioxide shielding pump 8. The carbon dioxide shield pump 8 is cycled many times so that the carbon dioxide returning from the end freeze tube is a two-phase gas-liquid mixture. The carbon dioxide liquid receiver 9 has the carbon dioxide gas-liquid separation function, the carbon dioxide gas-liquid two-phase mixture returned from the tail end freezing pipe enters the carbon dioxide liquid receiver 9 for gas-liquid separation, the liquid is sunk into the carbon dioxide liquid receiver 9, and the gas is discharged from the carbon dioxide liquid receiver 9 and enters the pipe side of the condensation evaporator 5 to complete circulation.
Controlling:
the economizer 11 adopts a dry shell-and-tube heat exchanger, a temperature transmitter 13, a first pressure transmitter 14 and a second electronic expansion valve 12 are installed, and the superheat degree of refrigerant gas discharged from the tube pass of the economizer 11 is monitored through a control system, so that the second electronic expansion valve 12 is adjusted, and the liquid supply control of the economizer refrigerant is realized.
The condensation evaporator 5 adopts a full liquid shell-and-tube heat exchanger, is provided with a first liquid level transmitter 4 and a first electronic expansion valve 10, and monitors the shell side liquid level of the condensation evaporator 5 through a control system, so that the first electronic expansion valve 10 is adjusted, and the control of liquid supply of a refrigerant of the condensation evaporator is realized.
Claims (4)
1. The utility model provides a carbon dioxide carries cold unit for artificial stratum system of freezing, is including opening single-stage screw compressor, oil piping system, economic ware, water-cooled condenser, condensation evaporimeter, carbon dioxide receiver, carbon dioxide canned motor pump and control system, oil piping system includes oil separator, liquid cooling oil cooler, oil filter and lubricating oil pump, its characterized in that:
the oil outlet of the oil separator is connected with the oil inlet of the liquid cooling oil cooler, the oil outlet of the liquid cooling oil cooler is connected with the inlet of an oil filter, the outlet of the oil filter is connected with the inlet of a lubricating oil pump, and the outlet of the lubricating oil pump is connected with a single-stage screw compressor which is started;
the outlet of the opened single-stage screw compressor is connected with the air inlet of the oil separator, the air outlet of the oil separator is connected with the air inlet of the water-cooled condenser, the liquid outlet of the water-cooled condenser is connected with the liquid inlet of the economizer, the liquid outlet of the economizer is connected with the liquid inlet of the condensation evaporator, and the air outlet of the condensation evaporator is connected with the opened single-stage screw compressor;
the pipeline that returns from freezing the pipe is connected with carbon dioxide cistern inlet, and carbon dioxide cistern gas outlet is connected with condensation evaporator air inlet, and condensation evaporator liquid outlet and carbon dioxide cistern return the liquid mouth and be connected, and carbon dioxide cistern liquid outlet is connected with carbon dioxide shield pump, supplies liquid carbon dioxide to freezing the pipe through carbon dioxide shield pump.
2. The carbon dioxide chiller plant for an artificial formation freezing system of claim 1 wherein: the economizer adopts a dry shell-and-tube heat exchanger and is provided with a temperature transmitter, a pressure transmitter and an electronic expansion valve; the control system is used for controlling the liquid supply of the economizer refrigerant, so that the refrigerant liquid is subcooled to increase the cooling capacity.
3. The carbon dioxide chiller plant for an artificial formation freezing system of claim 1 wherein: the condensation evaporator adopts a full liquid shell-and-tube heat exchanger, is provided with a liquid level transmitter and an electronic expansion valve, and controls the liquid supply of the evaporator refrigerant through a control system to realize the cooling of gaseous carbon dioxide to liquid state.
4. The carbon dioxide chiller plant for an artificial formation freezing system of claim 1 wherein: the carbon dioxide liquid reservoir is provided with a liquid level transmitter and a pressure transmitter, and the carbon dioxide shielding pump is controlled to be started and stopped by a control system, so that liquid carbon dioxide is supplied to the freezing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450347.0A CN114704972A (en) | 2022-04-27 | 2022-04-27 | Carbon dioxide cold-carrying unit for artificial stratum freezing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450347.0A CN114704972A (en) | 2022-04-27 | 2022-04-27 | Carbon dioxide cold-carrying unit for artificial stratum freezing system |
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| CN114704972A true CN114704972A (en) | 2022-07-05 |
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| CN202210450347.0A Pending CN114704972A (en) | 2022-04-27 | 2022-04-27 | Carbon dioxide cold-carrying unit for artificial stratum freezing system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202757337U (en) * | 2012-07-11 | 2013-02-27 | 武汉新世界制冷工业有限公司 | Screw type refrigeration compressor unit for economizer |
| CN204358988U (en) * | 2014-11-14 | 2015-05-27 | 武汉新世界制冷工业有限公司 | ammonia and carbon dioxide indirect refrigeration system |
| JP2016118024A (en) * | 2014-12-19 | 2016-06-30 | ケミカルグラウト株式会社 | Ground freezing method and ground freezing system |
| JP2019148104A (en) * | 2018-02-27 | 2019-09-05 | ケミカルグラウト株式会社 | Ground freezing method |
| CN214062952U (en) * | 2020-11-08 | 2021-08-27 | 上海市隧道工程轨道交通设计研究院 | Artificial stratum freezing system |
| CN214573874U (en) * | 2021-01-29 | 2021-11-02 | 中国建筑第八工程局有限公司 | Artificial stratum freezing system utilizing low-temperature carbon dioxide circulation refrigeration |
| CN215052881U (en) * | 2021-05-11 | 2021-12-07 | 中国建筑第八工程局有限公司 | Staged refrigeration artificial stratum freezing system |
-
2022
- 2022-04-27 CN CN202210450347.0A patent/CN114704972A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202757337U (en) * | 2012-07-11 | 2013-02-27 | 武汉新世界制冷工业有限公司 | Screw type refrigeration compressor unit for economizer |
| CN204358988U (en) * | 2014-11-14 | 2015-05-27 | 武汉新世界制冷工业有限公司 | ammonia and carbon dioxide indirect refrigeration system |
| JP2016118024A (en) * | 2014-12-19 | 2016-06-30 | ケミカルグラウト株式会社 | Ground freezing method and ground freezing system |
| JP2019148104A (en) * | 2018-02-27 | 2019-09-05 | ケミカルグラウト株式会社 | Ground freezing method |
| CN214062952U (en) * | 2020-11-08 | 2021-08-27 | 上海市隧道工程轨道交通设计研究院 | Artificial stratum freezing system |
| CN214573874U (en) * | 2021-01-29 | 2021-11-02 | 中国建筑第八工程局有限公司 | Artificial stratum freezing system utilizing low-temperature carbon dioxide circulation refrigeration |
| CN215052881U (en) * | 2021-05-11 | 2021-12-07 | 中国建筑第八工程局有限公司 | Staged refrigeration artificial stratum freezing system |
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