WO2011117765A2 - Controlling a oxygen liquefaction system responsive to a disturbance in supplied power - Google Patents
Controlling a oxygen liquefaction system responsive to a disturbance in supplied power Download PDFInfo
- Publication number
- WO2011117765A2 WO2011117765A2 PCT/IB2011/050782 IB2011050782W WO2011117765A2 WO 2011117765 A2 WO2011117765 A2 WO 2011117765A2 IB 2011050782 W IB2011050782 W IB 2011050782W WO 2011117765 A2 WO2011117765 A2 WO 2011117765A2
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- WO
- WIPO (PCT)
- Prior art keywords
- current
- responsive
- liquefaction system
- refrigeration compressor
- monitored
- Prior art date
Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000001301 oxygen Substances 0.000 title claims abstract description 91
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 91
- 238000005057 refrigeration Methods 0.000 claims description 70
- 238000000034 method Methods 0.000 claims description 28
- 239000003507 refrigerant Substances 0.000 claims description 27
- 238000012806 monitoring device Methods 0.000 claims description 17
- 230000009849 deactivation Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 description 21
- 239000007789 gas Substances 0.000 description 14
- 238000012545 processing Methods 0.000 description 11
- 230000004913 activation Effects 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000012790 confirmation Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
Classifications
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0012—Primary atmospheric gases, e.g. air
- F25J1/0017—Oxygen
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0281—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc. characterised by the type of prime driver, e.g. hot gas expander
- F25J1/0284—Electrical motor as the prime mechanical driver
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0298—Safety aspects and control of the refrigerant compression system, e.g. anti-surge control
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2280/00—Control of the process or apparatus
- F25J2280/20—Control for stopping, deriming or defrosting after an emergency shut-down of the installation or for back up system
Definitions
- the invention relates to establishing normal operation of a liquefaction system responsive to a deviation in current supplied thereto.
- Deviations in electrical power (e.g., surges, dips, and/or interrupts) supplied to such liquefaction systems can occur, for example, as a result of a fault in an associated power distribution system (e.g., open circuit breaker).
- a power distribution system fault can cause a switch in an associated distribution grid to open and close a number of times resulting in multiple interrupts to the oxygen liquefaction system.
- a large load being energized in the vicinity of a liquefaction system may also result in a deviation in electrical power supplied to the liquefaction system.
- deviations in electrical supply may have a very short duration (e.g., a fraction of an AC-cycle, 20 AC- cycles, 40 AC-cycles, etc. (one AC-cycle at 60Hz has a duration of 16.7ms))
- a refrigeration compressor of a liquefaction system may cease to operate properly or at all when subjected to such a deviation in electrical power supply.
- Medical equipment such as a liquefaction system for liquefying oxygen, may be required to demonstrate resistance or immunity to deviations in electrical power supply to insure continued reliable and safe operation when subjected such deviations.
- various circuit elements e.g., fuses and/or breakers
- a refrigeration compressor of a liquefaction system may require resetting or replacement subsequent to a deviation in electrical power supply.
- Such resetting or replacement may require a user of a liquefaction system to possess some level of technical inclination, which cannot always be the case.
- the user of a conventional liquefaction system may need to be alerted that the system is not functioning properly.
- an object of the present invention to provide an oxygen liquefaction system and method of using same that overcomes the shortcomings of conventional such systems.
- This object is achieved according to one embodiment of the present invention by providing a method for establishing normal operation of an oxygen liquefaction system responsive to a deviation in current supplied thereto.
- the method includes monitoring the current being supplied to a compressor included in the oxygen liquefaction system.
- the method also includes deactivating the compressor responsive to commencement of a current level deviation event in the monitored current.
- the method further includes energizing the compressor responsive to cessation of the current level deviation event in the monitored current.
- Another aspect of the invention relates to apparatus for establishing
- the apparatus includes a current monitoring device configured to monitor current being supplied to a refrigeration compressor included in the oxygen liquefaction system.
- the apparatus further includes a power modulation device configured to deactivate the refrigeration compressor responsive to commencement of a current level deviation event in the monitored current and to energize the refrigeration compressor responsive to cessation of the current level deviation event in the monitored current.
- Yet another aspect of the invention relates to apparatus for establishing normal operation of an oxygen liquefaction system responsive to a deviation in current supplied thereto.
- the apparatus includes a current monitoring means for monitoring current being supplied to a refrigeration compressor included in the oxygen liquefaction system.
- the apparatus also includes deactivation means for deactivating the refrigeration compressor responsive to commencement of a current level deviation event in the monitored current.
- the apparatus further includes energization means for energizing the refrigeration compressor responsive to cessation of the current level deviation event in the monitored current.
- FIG. 1 is a block diagram illustrating an exemplary oxygen liquefaction system configured to establish normal operation responsive to a deviation in current supplied thereto;
- FIG. 2 illustrates a method for establishing normal operation of an oxygen liquefaction system responsive to a deviation in current supplied thereto, in accordance with one or more embodiments of the invention.
- FIG. 1 is a block diagram illustrating an exemplary oxygen liquefaction system 100.
- the oxygen liquefaction system 100 is configured to establish normal operation responsive to a deviation in current supplied thereto. More specifically, by monitoring current supplied to a refrigeration compressor (described further herein) included in the oxygen liquefaction system 100, the refrigeration compressor can be deactivated responsive to commencement of a current level deviation event (e.g., surge, dip, and/or interrupt) in the monitored current, and can be energized responsive to cessation of the current level deviation event, in order to establish normal operation of the oxygen liquefaction system 100.
- a current level deviation event e.g., surge, dip, and/or interrupt
- various components of the oxygen liquefaction system 100 do not require resetting or replacement after the oxygen liquefaction system 100 is subjected to a current level deviation event.
- oxygen liquefaction system 100 includes a user interface 102, a liquefied oxygen generation unit 104, an oxygen generation unit 106, a refrigeration unit 108, a current monitoring device 110, and a power modulation unit 112.
- the description of the oxygen liquefaction system is illustrative and not intended to be limiting.
- oxygen liquefaction system 100 may include additional components not necessary to describe the present technology.
- the present technology is described in the context of an oxygen liquefaction system, the concepts may be applied to any type of liquefaction system (e.g., a nitrogen liquefaction system).
- User interface 102 is configured to provide an interface between the
- oxygen liquefaction system 100 and a user through which the user may provide information to and receive information from oxygen liquefaction system 100.
- This enables data, results, and/or instructions and any other communicable items, collectively referred to as "information," to be communicated between the user and the oxygen liquefaction system.
- the term "user” may refer to a single individual or a group of individuals who may be working in coordination.
- Examples of interface devices suitable for inclusion in user interface 102 include a keypad, buttons, switches, a keyboard, knobs, levers, a display screen, a touch screen, speakers, a microphone, an indicator light, an audible alarm, and a printer.
- user interface 102 actually includes a plurality of separate interfaces.
- the present invention contemplates that the user interface may be integrated with a removable storage interface provided by an electronic storage (see, e.g., electronic storage 128 described further herein).
- information may be loaded into oxygen liquefaction system 100 from removable storage (e.g., a smart card, a flash drive, a removable disk, etc.) that enables the user(s) to customize the
- oxygen liquefaction system implementation of the oxygen liquefaction system.
- Other exemplary input devices and techniques adapted for use with the oxygen liquefaction system as user interface 102 include, but are not limited to, an RS-232 port, RF link, an IR link, modem (telephone, cable or other).
- any technique for communicating information with oxygen liquefaction system 100 is contemplated by the present invention as the user interface 102.
- Liquefied oxygen generation unit 104 may be configured to generate
- Liquefied oxygen may be generated from gaseous oxygen by reducing the temperature of the gaseous oxygen (e.g., to cryogenic levels) and/or by pressurizing the gaseous oxygen.
- the liquefied oxygen generation unit may include various components (not depicted) to generate and/or store liquefied oxygen, such as one or more of a heat exchanger, a dewar, and/or other components for generating and/or storing liquefied oxygen.
- the liquefied oxygen generation unit 104 is described further in connection with oxygen generation unit 106 and refrigeration unit 108.
- Oxygen generation unit 106 may be configured to generate gas having high oxygen content (e.g., 93% pure medical grade oxygen) from gas provided via a gas intake 114.
- the gas provided via an gas intake 1 14 may include ambient air
- oxygen generation unit 106 generates gas having high oxygen content by way of a sieving process.
- Oxygen generation unit 106 may include various components (not depicted) to generate gas having high oxygen content, such as one or more of an air compressor, a fan, a sieve bed, and/or other components for generating gas having high oxygen content.
- gas having high oxygen content may be pressurized by oxygen generation unit 106.
- Gas having high oxygen content may be delivered from the oxygen generation unit to the liquefied oxygen generation unit 104 via a purified oxygen line 116.
- Refrigeration unit 108 may be configured to cool and circulate refrigerant utilized by liquefied oxygen generation unit 104 for generating liquefied oxygen.
- the refrigeration unit may include a refrigeration compressor 1 18 configured to drive circulation of the refrigerant, as well as various other components (not depicted) to cool or otherwise treat the refrigerant, such as one or more of a condenser coil, a fan, a hot separator, a cold separator, a filter, a dryer, and/or other components for cooling or otherwise treating the refrigerant.
- Cooled refrigerant may be delivered from the refrigeration unit 108 to the liquefied oxygen generation unit 104 via a cold refrigerant line 120, while spent refrigerant may be returned from the liquefied oxygen generation unit 104 to the refrigeration unit 108 via a hot refrigerant line 122.
- 118 is binary in that the refrigeration compressor is either on (energized) or off
- Refrigeration compressor 118 may stop operating responsive to occurrence of a current level deviation event in the power delivered from power supply 124. Refrigeration compressor 118 may not resume normal operation when the current level deviation event ceases due to, for example, pressure differences between cold refrigerant line 120 and hot refrigerant line 122. That is, even though power may be supplied to the refrigeration compressor immediately after the refrigeration compressor has been deactivated during a current level deviation event, the refrigeration compressor may not properly drive circulation of the refrigerant.
- the compressor in an oxygen liquefaction system is obtained by monitoring production levels of liquefied oxygen. It can take 5 to 10 hours for a current level deviation event to reflect operation has returned to normal after the current level deviation event. Embodiments of the present technology, however, allow a current level deviation event to be detected.
- the refrigeration compressor may be deactivated such that the refrigeration compressor remains off even if the current level deviation event has ceased.
- the refrigeration compressor may be activated after the current level deviation event has ceased and after any pressure difference is reduced between cold refrigerant line 120 and hot refrigerant line 122.
- the current drawn by refrigeration compressor 1 18 being at a proper level may serve as confirmation that the refrigeration compressor is operating normally. Such a confirmation can be obtained substantially faster than conventional systems (e.g., about 30 minutes compared to 5 to 10 hours).
- Refrigeration unit 108 and/or various components therein e.g.,
- refrigeration compressor 118 may receive electrical power from a power supply 124 via a power line 126.
- Current monitoring device 110 may be configured to monitor, measure, or otherwise probe current delivered via power line 126 from power supply 124 to the refrigeration unit 108 (or components therein).
- the current monitoring device may include any type of current sensing device such as a linear current sensor (e.g.,
- Honeywell linear current sensor CSLA1CD Honeywell linear current sensor CSLA1CD
- a current transformer a Hall-effect sensor, and/or any other device suitable for determining the current delivered via power line 126.
- Power modulation unit 112 may be communicatively coupled with current monitoring device 110, refrigeration unit 108, and/or other components of the oxygen liquefaction system 100.
- the power modulation unit may be configured to deactivate and/or energize refrigeration unit 108 and/or components therein (e.g., the refrigeration compressor) based at least in part on current delivered via power line 126, as determined by current monitoring device 1 10.
- power modulation unit 1 12 may include circuitry (e.g., an RC circuit) configured to effectuate the functionalities attributed herein to the power modulation unit.
- power modulation unit 112 includes an electronic storage 128 and a processor 130.
- electronic storage 128 includes electronic storage media that electronically stores information.
- the electronic storage media of electronic storage 128 may include system storage that is provided integrally (i.e., substantially nonremovable) with oxygen liquefaction system 100 and/or removable storage that is removably connectable to the oxygen liquefaction system via, for example, a port (e.g., a USB port, a firewire port, etc.) or a drive (e.g., a disk drive, etc.).
- a port e.g., a USB port, a firewire port, etc.
- a drive e.g., a disk drive, etc.
- Electronic storage 128 may include one or more of optically readable storage media (e.g., optical disks, etc.), magnetically readable storage media (e.g., magnetic tape, magnetic hard drive, floppy drive, etc.), electrical charge-based storage media (e.g., EEPROM, RAM, etc.), solid- state storage media (e.g., flash drive, etc.), and/or other electronically readable storage media.
- Electronic storage 128 may store software algorithms, information determined by processor 130, information received via user interface 102, and/or other information that enables oxygen liquefaction system 100 to function properly.
- the electronic storage may be a separate component within oxygen liquefaction system 100, or the electronic storage may be provided integrally with one or more other components of the oxygen liquefaction system (e.g., processor 130).
- Processor 130 may be configured to provide information processing
- the processor may include one or more of a digital processor, an analog processor, a digital circuit designed to process information, an analog circuit designed to process information, a state machine, and/or other mechanisms for electronically processing information.
- the processor is shown in FIG. 1 as a single entity, this is for illustrative purposes only.
- the processor may include a plurality of processing units. These processing units may be physically located within the same device or computing platform, or the processor may represent processing functionality of a plurality of devices operating in coordination.
- processor 130 may be configured to execute one or more computer program modules.
- the one or more computer program modules may include one or more of an event detection module 132, a deactivation module 134, an activation module 136, a performance characteristic identification module 138, and/or other modules.
- the processor 130 may be configured to execute modules 132, 134, 136, and/or 138 by software; hardware; firmware; some combination of software, hardware, and/or firmware; and/or other mechanisms for configuring processing capabilities on the processor 130.
- modules 132, 134, 136, and 138 are illustrated in FIG. 1 as being co-located within a single processing unit, in
- modules 132, 134, 136, and/or 138 may be located remotely from the other modules.
- the description of the functionality provided by different modules 132, 134, 136, and/or 138 described below is for illustrative purposes, and is not intended to be limiting, as any of modules 132, 134, 136, and/or 138 may provide more or less functionality than is described.
- one or more of modules 132, 134, 136, and/or 138 may be eliminated, and some or all of its functionality may be provided by other ones of modules 132, 134, 136, and/or 138.
- the processor 130 may be configured to execute one or more additional modules that may perform some or all of the functionality attributed below to one of modules 132, 134, 136, and/or 138.
- Event detection module 132 may be configured to detect a current level deviation event.
- event detection module 132 may monitor the current level of power line 126, as determined by current monitoring device 110. The monitored current may breach a threshold level during such a current level deviation event. In some instances, the monitored current may exceed an upper threshold level, while in other instances, the monitored current may fall below a lower threshold level. Threshold levels may be predetermined, determined dynamically, inputted via the user interface 102, and/or be established in another way. The event detection module may identify commencement and/or cessation of a current level deviation event. According to some embodiments, event detection module 132 may provide an indication, such as via user interface 102, of a current level deviation event.
- Deactivation module 134 may be configured to deactivate refrigeration compressor 118 responsive to commencement of a current level deviation event. In some embodiments, deactivation module 134 may effectuate actuation of a switch (not depicted) to electrically disconnect the refrigeration compressor from power supply 124. The deactivation module may deactivate the refrigeration compressor by deactivating a controller (not depicted) associated with the refrigeration compressor, in accordance with some embodiments.
- Energization module 136 may be configured to energize refrigeration compressor 118 responsive to cessation of the current level deviation event. According to some embodiments, activation module 136 may effectuate actuation of a switch (not depicted) to electrically connect the refrigeration compressor to the power supply 124. Activation module 136 may activate refrigeration compressor 1 18 by activating a controller (not depicted) associated with the refrigeration compressor, in some embodiments. The activation module may delay activation of the refrigeration compressor for a period of time such that any pressure differential is reduced between cold refrigerant line 120 and hot refrigerant line 122. [29] Performance characteristic identification module 138 may be configured to identify one or more performance characteristics of oxygen liquefaction system 100.
- a performance characteristic may be identified based at least in part on the current level deviation event detected by event detection module 132 and/or the current being drawn by refrigeration compressor 1 18 from power supply 124 as measured by the current monitoring device 110.
- the performance characteristic may be identified as normal operation. Responsive to the current monitored by the current monitoring device 110 falling below a threshold level, the performance characteristic may be identified as an open refrigeration compressor circuit.
- the performance characteristic may be identified as a potential refrigerant leak in response to the current monitored by current monitoring device 110 falls below a threshold level.
- the performance characteristic may be identified as a potential refrigerant blockage responsive to the current monitored by current monitoring device 1 10 exceeding the threshold level.
- an indication of a performance characteristic may be provided by performance characteristic identification module 138, such as via user interface 102.
- FIG. 2 illustrates a method 200 for establishing normal operation of an oxygen liquefaction system (e.g., oxygen liquefaction system 100) responsive to a deviation in current supplied thereto, in accordance with one or more embodiments of the invention.
- an oxygen liquefaction system e.g., oxygen liquefaction system 100
- the operations of method 200 presented below are intended to be illustrative. In some implementations, the method 200 may be accomplished with one or more additional operations not described, and/or without one or more of the operations discussed. Additionally, the order in which the operations of the method 200 are illustrated in FIG. 2 and described below is not intended to be limiting.
- method 200 may be implemented in one or more processing devices (e.g., a digital processor, an analog processor, a digital circuit designed to process information, an analog circuit designed to process information, a state machine, and/or other mechanisms for electronically processing information).
- the one or more processing devices may include one or more devices executing some or all of the operations of method 200 in response to instructions stored electronically on an electronic storage medium.
- the one or more processing devices may include one or more devices configured through hardware, firmware, and/or software to be specifically designed for execution of one or more of the operations of the method 200.
- the operation 202 current being supplied to a compressor (e.g., the refrigeration compressor 1 18) included in an oxygen liquefaction system (e.g., the current monitoring device 1 10) is monitored.
- the operation 202 may be performed by the current monitoring device 1 10 in conjunction with the power modulation unit 1 12 (or one or more modules thereof).
- the event detection module 132 may detect a current level deviation event based on current measured by the current monitoring device 1 10.
- the compressor e.g., refrigeration compressor 1 18
- a current level deviation event e.g., surge, dip, and/or interrupt
- operation 204 may be performed by the deactivation module 134.
- the deactivation module 134 may effectuate actuation of a switch (not depicted in FIG. 1) to electrically disconnect the refrigeration compressor 1 18 from the power supply 124.
- the deactivation module 134 may deactivate the refrigeration compressor 1 18 by deactivating a controller (not depicted in FIG. 1) associated with the refrigeration compressor.
- the compressor e.g., the refrigeration compressor
- the operation 206 may be performed by the activation module 136, in some embodiments.
- activation module 136 may effectuate actuation of a switch (not depicted in FIG. 1) to electrically connect the refrigeration compressor 1 18 to power supply 124.
- the activation module 136 may activate refrigeration compressor 1 18 by activating a controller (not depicted in FIG. 1) associated with the refrigeration compressor.
- activation of the refrigeration compressor may be delayed for a period of time such any pressure differential is reduced between cold refrigerant line 120 and hot refrigerant line 122.
- one or more performance characteristics of the oxygen liquefaction system e.g., oxygen liquefaction system 100
- Performance characteristic e.g., oxygen liquefaction system 100
- identification module 138 may perform operation 206, in accordance with exemplary embodiments. For example, when refrigeration compressor 1 18 is drawing a proper level of current from power supply 124, the performance characteristic may be identified as normal operation. As another example, responsive to the current monitored by current monitoring device 1 10 falling below a threshold level, the performance characteristic may be identified as an open refrigeration compressor circuit and/or a potential refrigerant leak. As yet another example, the performance characteristic may identified as a potential refrigerant blockage responsive to the current monitored by current monitoring device 1 10 exceeding the threshold level.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN201180015482.2A CN103348204B (en) | 2010-03-25 | 2011-02-24 | In response to the disturbance control oxygen liquefaction system of supply power |
US13/637,128 US20130019632A1 (en) | 2010-03-25 | 2011-02-24 | Controlling a oxygen liquefaction system responsive to a disturbance in supplied power |
EP11712013A EP2550495A2 (en) | 2010-03-25 | 2011-02-24 | Controlling a oxygen liquefaction system responsive to a disturbance in supplied power |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US31743810P | 2010-03-25 | 2010-03-25 | |
US61/317,438 | 2010-03-25 |
Publications (2)
Publication Number | Publication Date |
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WO2011117765A2 true WO2011117765A2 (en) | 2011-09-29 |
WO2011117765A3 WO2011117765A3 (en) | 2014-04-17 |
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PCT/IB2011/050782 WO2011117765A2 (en) | 2010-03-25 | 2011-02-24 | Controlling a oxygen liquefaction system responsive to a disturbance in supplied power |
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US (1) | US20130019632A1 (en) |
EP (1) | EP2550495A2 (en) |
CN (1) | CN103348204B (en) |
WO (1) | WO2011117765A2 (en) |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1479561A (en) * | 1966-03-25 | 1967-05-05 | Air Liquide | Variable flow rate gas pre-production process |
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CN101688714B (en) * | 2007-05-15 | 2013-09-11 | 开利公司 | Compressor motor control |
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US8393169B2 (en) * | 2007-09-19 | 2013-03-12 | Emerson Climate Technologies, Inc. | Refrigeration monitoring system and method |
US9140728B2 (en) * | 2007-11-02 | 2015-09-22 | Emerson Climate Technologies, Inc. | Compressor sensor module |
JP2009298274A (en) * | 2008-06-12 | 2009-12-24 | Mitsubishi Electric Corp | Vehicular ventilating and air-conditioning device |
US20110061408A1 (en) * | 2009-09-11 | 2011-03-17 | Tom Schnelle | Dehumidifiers for high temperature operation, and associated systems and methods |
-
2011
- 2011-02-24 CN CN201180015482.2A patent/CN103348204B/en not_active Expired - Fee Related
- 2011-02-24 WO PCT/IB2011/050782 patent/WO2011117765A2/en active Application Filing
- 2011-02-24 US US13/637,128 patent/US20130019632A1/en not_active Abandoned
- 2011-02-24 EP EP11712013A patent/EP2550495A2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
US20130019632A1 (en) | 2013-01-24 |
WO2011117765A3 (en) | 2014-04-17 |
CN103348204A (en) | 2013-10-09 |
EP2550495A2 (en) | 2013-01-30 |
CN103348204B (en) | 2016-05-18 |
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