US20120055332A1 - Method for Extracting Gas from Liquid - Google Patents
Method for Extracting Gas from Liquid Download PDFInfo
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- US20120055332A1 US20120055332A1 US13/296,318 US201113296318A US2012055332A1 US 20120055332 A1 US20120055332 A1 US 20120055332A1 US 201113296318 A US201113296318 A US 201113296318A US 2012055332 A1 US2012055332 A1 US 2012055332A1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D19/0031—Degasification of liquids by filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D63/087—Single membrane modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D71/70—Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only
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- G—PHYSICS
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- G01N33/2841—Gas in oils, e.g. hydrogen in insulating oils
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- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/04—Characteristic thickness
Definitions
- the present invention relates to apparatus and methods for extracting dissolved gases from liquid, and more particularly, the invention relates to an apparatus for extracting gases dissolved in electrical insulating oils.
- fault gases The electric power industry has for many years recognized that thermal decomposition of the oil and other insulating materials within oil-insulated electrical apparatus can lead to the generation of a number of “fault gases. These phenomena occur in equipment such as oil filled transformers (both conservator and gas-blanketed types), load tap changers, transformer windings, bushings and the like.
- the presence of fault gases may be a measure of the condition of the equipment. As such, detection of the presence of specific fault gases in electrical apparatus, and quantification of those gases can be an important part of a preventative maintenance program.
- transformer oil can be indicative of transformer malfunctions, such as arcing, partial or coronal discharge.
- These conditions can cause mineral transformer oils to decompose generating relatively large quantities of low molecular weight hydrocarbons such as methane, in addition to some higher molecular weight gases such as ethylene and acetylene.
- Such compounds are highly volatile, and in some instances they may accumulate in a transformer under relatively high pressure. This is a recipe for disaster. Left undetected or uncorrected, equipment faults can lead to an increased rate of degradation, and even to catastrophic explosion of the transformer.
- Transformer failure is a significantly expensive event for an electric utility, not only in terms of down time and the costs of replacement equipment, but also in terms of the costs associated with lost power transmission.
- the most efficient operating conditions for a given transformer can be actively monitored and the transformer load may be run at or near its optimum peak. Moreover, when dangerous operating conditions are detected the transformer can be taken off line for maintenance.
- the advantages of the present invention are achieved in a first preferred and illustrated embodiment of a gas extraction apparatus that provides for reliable and accurate extraction of dissolved gases and for fluid-tight handling of both oil and extracted gas.
- the apparatus utilizes an extraction module comprising paired fluorosilicone membrane disks held in a housing.
- the membranes are permeable to target gas, but not to the insulating oil.
- the housing defines isolated oil and gas flow paths.
- the extraction module is connected to an analytical instrument such as a gas chromatograph for qualitative and quantitative analysis of the extracted gases.
- the extraction module may be built with multiple pairs of membrane disks, or a single membrane disk.
- FIG. 1 is a simplified block diagram showing a system incorporating a gas extraction apparatus in accordance with the present invention.
- FIG. 2 is a simplified block diagram showing the gas extraction apparatus according to the present invention with significant other components with which the gas extraction apparatus is used.
- FIG. 3 is a perspective view of a preferred embodiment of the gas extraction apparatus according to the invention.
- FIG. 4 is an exploded perspective view of the gas extraction apparatus shown in FIG. 3 .
- FIG. 5A is plan view of a membrane separation disk of the type used in the gas extraction apparatus.
- FIG. 5B is a perspective view of the membrane separation disk shown in FIG. 5A .
- FIG. 6 is a cross sectional view of the membrane separation disk taken along the line 6 - 6 of FIG. 5A .
- FIG. 7 is a schematic view of the flow paths for the first and second phases through the gas extraction apparatus.
- the gas extractor and analyzer 1 of the present invention is contained in a housing 2 that is located externally to the oil-filled or blanketed electrical device 3 that is being monitored.
- Electrical device 3 is typically a conservator or gas blanketed transformer, load tap changer, etc.
- a sample fluid supply line 4 is connected to electrical device 3 and delivers sample fluid to the components contained in housing 2 .
- a sample fluid return line 5 likewise returns sample fluid to the electrical device from the analyzer 1 . Extractor/analyzer 1 has been designed to be operable over extended periods of time without maintenance.
- sample fluid is routed into extractor assembly 10 .
- Sample containing fluid i.e. oil
- extractor assembly or module 10 flows through extractor assembly or module 10 in a manner detailed below, where gas dissolved in the oil is extracted into a second fluid phase for further processing.
- the oil from which gas has been extracted is returned to electrical device 3 through fluid return line 5 .
- the gas that is extracted from the oil may be analyzed to determine the nature of the gases in the oil, or the extraction apparatus may be used to remove contaminants from the oil and thereby purify the oil.
- Sample line 4 is preferably attached to electrical device 3 at a point of high oil flow to insure that a representative sample of fluid is always provided to extractor assembly 10 .
- the location of the connection of the fluid return line 5 to electrical device 3 is not critical other than it being separated by a sufficient distance from the fluid supply line to not exchange substantially the same fluid.
- the fluid sample line can be attached to the oil fill valve on a transformer, a drain valve on an oil radiator, or an oil by-pass loop, for example.
- the fluid return line may be attached to the bottom drain valve to return the oil to the transformer, or other suitable positions.
- the present invention relies upon principles of diffusion across a membrane to extract gases from a first fluid phase where the dissolved gases are in a relatively higher concentration, compared with a second fluid phase where the gases are in a relatively lower concentration.
- the first fluid phase is the transformer insulating oil and the second fluid phase is the gas volume contained within analysis components of the system.
- Sample gas extracted from sample fluid flowing through the extractor assembly 10 is routed through tubing 12 to analytical instrument 14 , which is an instrument configured for running automated qualitative and quantitative analysis of the gas samples delivered to it.
- Analytical instrument 14 may be one of several kinds of laboratory gas detection instrumentation, and is preferably a gas chromatograph that is designed for installation in a remote location and is automated by the control of a programmed computer. Analytical instrument 14 is thus referred to on occasion as gas chromatograph 14 .
- Sample gas from analytical instrument 14 may be returned to extractor assembly 10 via tubing 13 .
- analytical instrument 14 is configured to work with computer systems 26 and external or remote communications equipment 32 so that analytical results may be acquired remotely.
- the word fluid refers to gases that flow through the instrument.
- the invention may be used with apparatus that use liquids and therefore the word fluid relates to any fluid that might be used in, and analyzed by, an analytical instrument.
- gas chromatograph 14 is fluidly connected to a source of calibration gas (fluid) 16 , extractor module 10 , which is the source of a sample for test 18 (i.e., the samples of gas extracted from oil in electrical device 3 that are to be analyzed), and a carrier fluid 20 which typically is supplied as a high pressure inert gas such as helium.
- a source of calibration gas fluid
- extractor module 10 which is the source of a sample for test 18 (i.e., the samples of gas extracted from oil in electrical device 3 that are to be analyzed)
- carrier fluid 20 typically is supplied as a high pressure inert gas such as helium.
- Each of these sources of fluid is connected to a distribution manifold assembly, generally referenced with numeral 22 .
- the fluid connections between the source fluids 16 , 18 and 20 are accomplished with appropriate fluid lines 24 (which is the connection from calibration fluid 16 to distribution manifold assembly 22 ), 25 (the connection from sample for test 18 to distribution manifold assembly 22 ) and 27 (the connection from carrier fluid 20 to the distribution manifold assembly.
- These fluid lines are preferably stainless steel tubing.
- the fluid lines 24 , 25 and 27 are fitted with appropriate passive fittings such as sealed compression ferrule-type fittings and the like. All connections between fluid lines 24 , 25 and 27 and other components, such as components of distribution manifold 22 , are fluid-tight connections with appropriate gaskets and 0 -rings and the like.
- Distribution manifold assembly 22 does not form a part of the present invention and is not described in detail herein. However, a manifold assembly suitable for use with the present invention is described in detail in U.S. Pat. No. 6,391,096, which as noted above is incorporated herein by reference.
- Several components of the invention, including active fluid handling and control components are under the active control of a computer 26 .
- Computer 26 is connected to and sends command signals to and receives data from components associated with distribution manifold assembly 22 by way of data lines 28 .
- Computer 26 also controls operation of analytical instrument 14 through data lines 30 .
- Computer 26 is connected to telephony or other remote or external communications systems equipment 32 so that computer 26 may be operated from a remote location, which thus allows the analytical instrument to be operated remotely and for data from the instrument to be acquired from a remote location.
- Computer 26 also controls the extractor control components which include circuitry and state machines that monitor and control the gas extraction module 10 .
- Computer 26 will be appreciated therefore to encompass any microprocessor, microcontroller or other processor and associated hardware and software.
- Sample aliquots of fluid that are to be analyzed are acquired and controlled by the fluid control and handling components of extractor/analyzer 1 and are injected into a gas chromatograph 14 .
- the chromatograph 14 shown schematically in FIG. 1 is preferably a dual column chromatograph.
- the fluid control and handling components of distribution manifold assembly 22 fluidly route the sample aliquots to one of the selected separator columns.
- Analyte separation in chromatograph 14 is carried on under controlled conditions as is well known in the art.
- the separation columns in the chromatograph are contained within a temperature-controlled cabinet.
- all components of chromatograph 14 are contained within appropriate housings, none of which are shown in the figures but which will be understood as being necessary to perform reproducible and accurate analysis.
- Gas chromatograph 14 includes a detector such as a thermal conductivity detector that is under the control of computer 26 . Analytes separated in the chromatographic columns flow into and through the detector. Fluid flowing through the system such as carrier fluid and analyzed sample are exhausted to the atmosphere at exhaust port 34 .
- Analytical data compiled by gas chromatograph 14 from the analyzed sample is transmitted to computer 26 via data lines 30 where it is further processed according to software stored in the computer. Analytical results may then be transmitted from the computer 26 through remote communications equipment 32 on an automated basis, or the data may be acquired on prompt from a remote location.
- assembly 10 includes a generally cylindrical housing 50 that includes a first plate 52 , a second plate 54 , and a scarfing ring 56 sandwiched between the first and second plates.
- housing 50 there are several component parts contained in housing 50 , including the components that facilitate extraction of gas from the electrical insulating oil that is fed into extractor assembly 10 , and various fluid flow paths for oil and extracted gas.
- An oil pump 58 is mounted centrally to second plate 54 with bolts 55 such that the pump controls the flow of oil through the extractor assembly 10 .
- Also mounted to second plate 54 is a gas pump 60 .
- An oil temperature sensor 62 is mounted to a side of second plate 54 and provides a means to monitor the temperature of oil or other fluid in the housing 50 —the temperature sensor is threaded into a cooperative threaded opening in the housing.
- Temperature sensor 62 is preferably a standard thermocouple but could be any appropriate temperature sensing device.
- an oil pressure transducer 64 is mounted to a side of the second plate 54 so that the oil pressure in housing 50 may be monitored on an ongoing basis.
- the transducer also is threaded into a threaded opening in the housing. All of the foregoing components are attached to and under the control of the computer 26 .
- Oil inlet 66 is connected to oil sample fluid line 4 and oil outlet 68 is connected to oil sample return line 5 .
- oil from electrical device 3 flows in a loop beginning with the electrical device, delivered through sample line 4 to extractor assembly 10 where gas in the oil is extracted, flows through housing 50 , and is then returning to the electrical device via return line 5 .
- a gas inlet 70 and gas outlet 72 are attached to second plate 54 .
- the oil and gas inlets and outlets just described are standard fittings that are threaded into the first and second plates, respectively.
- Gas inlet 70 is connected to tubing 13 and is thus the return line from analytical instrument 14 .
- the gas outlet 72 is connected to tubing 12 and defines the sample delivery line to the analytical instrument.
- the gas extracted from oil flowing through extractor assembly 10 is pumped with gas pump 60 through outlet 72 , through tubing 12 to analytical instrument 14 , and depending upon the state operation, may be returned to extractor assembly 10 via tubing 13 and inlet 70 .
- All fittings and connections to housing 50 are leak free and utilize appropriate fittings and fluid-tight seal components such as O-rings and the like to ensure that there are no leaks.
- first plate 52 the primary components of housing 50
- second plate 54 the primary components of housing 50
- first and second plates 52 and 54 have fluid flow paths defined through them in the manner and for the purposes detailed below.
- first frit 74 is a porous disk material through which oil and/or other liquids readily flow. Frit 74 is preferably sintered bronze but may be fabricated from other porous materials including sintered glass, sintered metals, or wire mesh and other materials.
- first side 76 of first frit 74 is sealed around a perimeter thereof with adhesive to a cooperative seat 77 on the inner-facing side of first plate 52 .
- the seal between the first frit and the first plate may be facilitated with pressure applied between the two when the extractor assembly is bolted together.
- Adjacent first frit 74 is first membrane 78 , which is attached and sealed around its perimeter in the manner described below to scarfing ring 56 .
- a second membrane 86 is attached and sealed around its perimeter to scarfing ring 56 .
- a spacer layer 82 is positioned between first membrane 78 and second membrane 86 .
- Spacer layer 82 provides a physical separation between the two membranes and is porous and inert to the analyte gases.
- the spacer layer 82 is preferably a porous paper material that is not degraded by the kinds of gases that are extracted from oil in the system described herein; filter-type papers have been found to work well but there are numerous other materials such as cotton and other fibrous pads that will work.
- the spacer layer 82 physically separates the two adjacent membranes 78 and 84 and thereby defines a space through which gas extracted from oil may flow, as detailed below.
- a second frit 88 which is an identical material to that described above with respect to first frit 74 is attached to second plate 54 , again in a manner identical to that described above with respect to first frit 74 .
- the components just described and shown in exploded format in FIG. 4 are sandwiched together in the assembled extractor 10 with a series of bolts 90 (one of which is shown in FIG. 4 ) around the perimeter of the plates 52 and 54 .
- a first O-ring 80 between first plate 52 and scarfing ring 56 , and a second O-ring 84 between second plate 54 and the opposite side of scarfing ring 56 insure that the extractor assembly 10 is leak-free when assembled.
- the O-rings reduce oxygen permutation from around the perimeter of the membranes 78 and 86 by isolating the membranes from the atmosphere.
- Membranes 78 and 86 are preferably fabricated from a flexible material that is readily permeable to hydrocarbons having small molecular weight of the kind that are of interest to the present invention but which is impermeable to electrical insulating oils.
- the preferred material is a fluorosilicone material, which is very stable in a hydrocarbon environment such as electrical insulating oils.
- the membrane 78 is molded by pressing fluorosilicone material that has been blended with polymerizing agents into a mold. The polymerized membrane is removed from the mold and is cured by baking at elevated temperatures.
- a predetermined mass of fluorosilicone material is preformed into a flattened disk.
- This pancake-shaped disk is then inserted into a compression mold where it is heated, squeezed and pressed into a very thin disk shape having the thickness attributes desired.
- the mold is maintained at an elevated pressure and temperature until the fluorosilicone material cures, at which time the part is removed from the mold.
- the membrane 78 defines a generally flattened circular disk that has a lip 100 defined around the outer peripheral edge 102 .
- the outer peripheral edge 102 of membrane 78 is relatively thicker than the central portions of the membrane.
- the thickness of the membrane is greatest near the outer peripheral edge and gradually is reduced moving toward the center of the membrane.
- the membrane material is thus relatively thicker at a peripheral portion 106 where the typical thickness is about 0.020 inches.
- the thickness of the membrane gradually decreases moving inwardly across the central portion 108 of the membrane toward the center of the membrane, where the membrane material is thinnest, typically about 0.004 inches.
- the lip 100 is configured to attach and seal to a cooperatively formed lip 104 on the inner-facing periphery of plates 52 and 54 ( FIG. 4 ).
- FIG. 6 the area of lip 104 of scarfing ring 56 to which lip 100 on the membrane 78 attaches is shown schematically with dashed lines.
- Extractor assembly 10 is assembled with the components described above in the manner shown in FIG. 4 with bolts 90 so that the assembly is hermetically sealed and provides fluid-tight and leak free connections in all respects.
- FIG. 7 which is highly schematic in order to show the various flow paths, plates 52 , 54 and scarfing ring 56 define fluid flow paths through which oil and gas separated from the oil in the extractor assembly 10 flows.
- the flow paths through plates 52 , 54 and scarfing ring 56 are defined by bores drilled through the plates. When the plates are assembled, the bores in the plates align and register with bores in the scarfing ring. O-rings are used to insure that the bores are leak free to define flow paths that are sealed.
- Oil is delivered from electrical device 3 through sample line 4 and into extractor assembly 10 via oil inlet 66 and by virtue of operation of pump 58 , which is fluidly connected to the oil bores through extractor assembly 10 .
- the oil flow path through extractor assembly 10 is illustrated in dashed, relatively heavy, bold lines with solid arrowheads illustrating the general flow route.
- the oil flow path is assigned reference number 111 .
- frit 74 is sealed to first plate 52 around the periphery of the frit disk, although this structural feature is not evident in the highly schematic view of FIG. 7 . This defines a space 110 between the surface of the inner-facing side 76 of the frit 74 and outer-facing side of membrane 78 into which oil flows.
- the oil which is under positive pressure by virtue of operation of pump 58 , flows through the center of frit 74 and then across the facing surfaces of the frit and membrane 78 .
- the oil tends to flow outwardly from the center of the membrane toward the outer periphery of the membrane and frit.
- a perimeter groove 114 located on the inner-facing surface of first plate 54 accumulates the oil. After the oil flows across the surface of membrane 78 and is returned to the transformer via bores that register with bores in scarfing ring 56 and first plate 52 .
- the oil flow path 111 continues on the opposite side of scarfing ring 56 into second plate 54 and into a space 116 between the inner-facing surface of frit 88 and the outer-facing surface of second membrane 86 .
- frit 88 is readily permeable to oil, and the oil flows through the frit and along the surface of the second membrane 86 . Again, the oil tends to flow outwardly from the center of the membrane toward the outer periphery of the membrane and frit where groove 120 on the inner-facing surface of second plate 54 accumulates the oil. Oil flows through bores in plate 54 and scarfing ring 56 that that register with bores in first plate 52 to define a return flow path. The oil thus returns in a loop through first plate 52 , through outlet 68 and to electrical device 3 by return line 5 .
- the oil flow through extractor assembly 10 defines a first phase. Gas extracted from the oil in the first phase forms a second phase; the flow path for the gas is illustrated in FIG. 7 with relatively lighter dashed lines with line-style arrow heads and is assigned reference number 130 .
- spacer 82 between the adjacent membranes 78 and 86 maintains a space 122 into which the gas diffuses. Gas flow is initiated and maintained by a pump 60 ( FIG. 4 ). As best shown in FIG. 7 , sample gases from analytical apparatus 14 enter extractor assembly 10 through gas inlet 70 in second plate 54 , and into gas phase flow path 130 through the spacer 82 (gas space 122 ), through gas pump 60 and is exhausted through gas outlet 72 and returned to analytical apparatus 14 .
- oil flow is initiated by operation of pump 58 , causing oil to flow in a circulating loop through oil phase flow path 111 .
- gas diffuses through the membranes (reference number 132 ) into the space 122 , which is defined by the spacer 82 , and thus into gas phase flow path 130 .
- the gas phase resulting from diffusion of gas molecules from the oil phase into the gas phase flows in a circulating loop through gas chromatograph 14 ; gas is circulated with the gas pump 60 . Circulation of the oil phase and gas phase is allowed to continue until equilibrium in the concentration of gas exists on both sides of the phase barriers defined by membranes 78 and 86 .
- the oil phase pressure may be less than the gas phase pressure. This may occur for several reasons, including aberrations in the operating conditions of the oil pump, external interference, etc. If a negative pressure does occur on the oil phase side, the membranes 78 and 86 tend to be “pulled” toward frits 74 and 88 , respectively. The frits support the membranes and prevent membrane rupture if the membranes are pulled toward the frits.
- Diffusion of compounds across the membranes is driven primarily by concentration gradients across the membranes.
- the time required to reach equilibrium or near equilibrium conditions depends upon factors such as gas concentration gradients and temperature, the volume of the gas being equilibrated, the thickness of the membrane, and the membrane surface area that is exposed to the oil.
- the flow rate of the oil carrying the gases affects the diffusion rate and thus the time required to reach equilibrium.
- contaminants of interest contained in oil filled device 3 are allowed to diffuse from the first liquid phase into the second fluid phase in extractor assembly 10 .
- oil is continuously circulated through the extractor assembly 10 , returning as described earlier to the oil filled device 3 .
- dissolved gas contained in the oil diffuses across the membranes 78 and 86 into the second phase.
- This second phase which comprises gaseous fluid, is circulated in either set time intervals or continuously to assure that all fluid in the second phase is homogeneous and until equilibrium conditions are reached.
- principles of diffusion dictate that the contaminants in the oil diffuse across the membrane from an area of relatively higher concentration to an area of relatively lower concentration until equilibrium (or conditions near to equilibrium) is reached.
- the system allows equilibration of the chromatograph 14 with pure carrier fluid 20 , which as noted is typically an inert gas such as helium. This allows any fluid in the separation columns to elute and be flushed through the instrument and to be vented to atmosphere at 34 . Sample gas is then injected into the chromatograph and gases present in the sample are qualitatively and quantitatively analyzed.
- pure carrier fluid 20 typically an inert gas such as helium.
- the extractor uses two membranes housed in a housing defined by two plates and a scarfing ring. It will be appreciated that the fluid flow paths through the plates are configured so that additional pairs of plates, membranes and a scarfing ring may be stacked so that the capacity of the system and its speed increase.
- an extractor module may be defined as two membranes, two plates and a single scarfing ring. Multiple extractor modules may be stacked with the fluid pathways between modules communicating.
- an extractor module according to the present invention may be made using a single membrane.
- the extractor module is configured as shown in the figures with only a single membrane.
- the oil phase containing contaminants flows over the first side of a single membrane and the contaminants diffuse through the membrane 78 into a space defined by a spacer layer 82 that is positioned on the opposite side of membrane 78 , thereby defining the physical separation between the single membrane 78 and the opposite wall of the module housing.
- the spacer layer 82 physically separates the single membrane 78 from the adjacent wall of the module housing and thereby defines a second phase space through which gas extracted from oil may flow.
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Abstract
Description
- The present invention relates to apparatus and methods for extracting dissolved gases from liquid, and more particularly, the invention relates to an apparatus for extracting gases dissolved in electrical insulating oils.
- The electric power industry has for many years recognized that thermal decomposition of the oil and other insulating materials within oil-insulated electrical apparatus can lead to the generation of a number of “fault gases. These phenomena occur in equipment such as oil filled transformers (both conservator and gas-blanketed types), load tap changers, transformer windings, bushings and the like. The presence of fault gases may be a measure of the condition of the equipment. As such, detection of the presence of specific fault gases in electrical apparatus, and quantification of those gases can be an important part of a preventative maintenance program.
- The presence of fault gases in oil-blanketed transformers with conservators and other utility assets has well documented implications relating to the performance and operating safety of the transformer. There is a substantial body of knowledge available correlating the presence of gases with certain, identified transformer conditions and faults. It is therefore beneficial to monitor the condition of dielectric fluids in electric equipment as a means to maximize performance, and at the same time minimize wear and tear on the equipment, and to thereby minimize maintenance costs and down time. Thus, information relating to the presence or absence of certain fault gases in transformer oil can lead to greatly increased efficiency in the operation of the transformer.
- As an example, it is known that the presence of certain fault gases in transformer oil can be indicative of transformer malfunctions, such as arcing, partial or coronal discharge. These conditions can cause mineral transformer oils to decompose generating relatively large quantities of low molecular weight hydrocarbons such as methane, in addition to some higher molecular weight gases such as ethylene and acetylene. Such compounds are highly volatile, and in some instances they may accumulate in a transformer under relatively high pressure. This is a recipe for disaster. Left undetected or uncorrected, equipment faults can lead to an increased rate of degradation, and even to catastrophic explosion of the transformer. Transformer failure is a significantly expensive event for an electric utility, not only in terms of down time and the costs of replacement equipment, but also in terms of the costs associated with lost power transmission. On the other hand, by closely monitoring dissolved gases in transformer oil, the most efficient operating conditions for a given transformer can be actively monitored and the transformer load may be run at or near its optimum peak. Moreover, when dangerous operating conditions are detected the transformer can be taken off line for maintenance.
- Despite the known need for reliable equipment to monitor gas in oil, designing equipment that holds up to the rigors of on-site conditions has been problematic for a variety of reasons. That said, there are a number of solutions known in the art. For example, mechanical/vacuum and membrane extraction methods and apparatus for degassing transformer oil are well known, as exemplified by U.S. Pat. No. 5,659,126. This patent discloses a method of sampling headspace gas in an electrical transformer, analyzing such gases according to a temperature and pressure dependent gas partition function, and based on the derived analysis predicting specific transformer faults.
- An example of a gas extraction apparatus that relies upon a membrane tube for extraction of gas from transformer oil is disclosed in U.S. Pat. No. 4,112,737. This patent depicts a plurality of hollow membrane fibers, which are inserted directly into transformer oil in the transformer housing. The material used for the membrane is impermeable to oil, but gases dissolved in the oil permeate through the membrane into the hollow interior of the fibers. A portable analytical device such as a gas chromatograph is temporarily connected to the probe so that the test sample is swept from the extraction probe into the analytical device for analysis.
- Although these devices have provided benefits, there are numerous practical problems remaining to the development of reliable apparatus for extraction, monitoring and analysis of fault gases in transformer oils. Many of these problems relate to the design of reliable fluid routing systems that are redundant enough to provide a relatively maintenance free unit. Since transformers are often located in exceedingly harsh environmental conditions, fluid routing problems are magnified. This is especially true given that the instruments needed to reliably analyze the gases are complex analytical instruments. Two patents that describe the difficulties of these engineering challenges are U.S. Pat. Nos. 6,391,096 and 6,365,105, which are owned by the assignee of this invention and both of which are incorporated herein by this reference. These two patents illustrate not only the complexities of the fluid routing systems needed, but solutions that have proved very reliable.
- One of the most critical points in the analytical process is the extraction apparatus, where gas is actually separated from the electrical insulating oil. While there are several known apparatus for accomplishing this task, experience has shown that the extractor is one point where failure can occur. Stated another way, extraction devices to date have been more fragile than desired and cannot fully withstand the extreme conditions that are routinely encountered in field applications. As a result, additional support equipment or operation constraints are added to compensate for the performance shortcomings and to protect the extraction technology, which adds considerably to the cost. Despite advances in the technological solutions surrounding the extraction devices, especially those described in the '096 and '105 patents, there is a need for an extractor that is reliable and performs accurately under all conditions for substantial lengths of time without being monitored.
- The advantages of the present invention are achieved in a first preferred and illustrated embodiment of a gas extraction apparatus that provides for reliable and accurate extraction of dissolved gases and for fluid-tight handling of both oil and extracted gas. The apparatus utilizes an extraction module comprising paired fluorosilicone membrane disks held in a housing. The membranes are permeable to target gas, but not to the insulating oil. The housing defines isolated oil and gas flow paths. The extraction module is connected to an analytical instrument such as a gas chromatograph for qualitative and quantitative analysis of the extracted gases.
- In alternative embodiments, the extraction module may be built with multiple pairs of membrane disks, or a single membrane disk.
- The invention will be better understood and its numerous objects and advantages will be apparent by reference to the following detailed description of the invention when taken in conjunction with the following drawings.
-
FIG. 1 is a simplified block diagram showing a system incorporating a gas extraction apparatus in accordance with the present invention. -
FIG. 2 is a simplified block diagram showing the gas extraction apparatus according to the present invention with significant other components with which the gas extraction apparatus is used. -
FIG. 3 is a perspective view of a preferred embodiment of the gas extraction apparatus according to the invention. -
FIG. 4 is an exploded perspective view of the gas extraction apparatus shown inFIG. 3 . -
FIG. 5A is plan view of a membrane separation disk of the type used in the gas extraction apparatus. -
FIG. 5B is a perspective view of the membrane separation disk shown inFIG. 5A . -
FIG. 6 is a cross sectional view of the membrane separation disk taken along the line 6-6 ofFIG. 5A . -
FIG. 7 is a schematic view of the flow paths for the first and second phases through the gas extraction apparatus. - The basic environment in which the gas extraction apparatus of the present invention is used and the significant components with which it is used will be described generally first to provide context, then a more detailed description of certain components will follow. With reference to
FIG. 1 it may be seen that the gas extractor andanalyzer 1 of the present invention is contained in ahousing 2 that is located externally to the oil-filled or blanketedelectrical device 3 that is being monitored.Electrical device 3 is typically a conservator or gas blanketed transformer, load tap changer, etc. A samplefluid supply line 4 is connected toelectrical device 3 and delivers sample fluid to the components contained inhousing 2. A samplefluid return line 5 likewise returns sample fluid to the electrical device from theanalyzer 1. Extractor/analyzer 1 has been designed to be operable over extended periods of time without maintenance. - Following generally the flow of sample fluid within
housing 2, fluid is routed intoextractor assembly 10. Sample containing fluid (i.e. oil) flows through extractor assembly ormodule 10 in a manner detailed below, where gas dissolved in the oil is extracted into a second fluid phase for further processing. The oil from which gas has been extracted is returned toelectrical device 3 throughfluid return line 5. The gas that is extracted from the oil may be analyzed to determine the nature of the gases in the oil, or the extraction apparatus may be used to remove contaminants from the oil and thereby purify the oil. -
Sample line 4 is preferably attached toelectrical device 3 at a point of high oil flow to insure that a representative sample of fluid is always provided toextractor assembly 10. The location of the connection of thefluid return line 5 toelectrical device 3 is not critical other than it being separated by a sufficient distance from the fluid supply line to not exchange substantially the same fluid. Specifically the fluid sample line can be attached to the oil fill valve on a transformer, a drain valve on an oil radiator, or an oil by-pass loop, for example. The fluid return line, on the other hand, may be attached to the bottom drain valve to return the oil to the transformer, or other suitable positions. Typically, there is no need to tap special ports into the transformer since the oil supply and return lines may be ported into existing locations. - As described below, the present invention relies upon principles of diffusion across a membrane to extract gases from a first fluid phase where the dissolved gases are in a relatively higher concentration, compared with a second fluid phase where the gases are in a relatively lower concentration. Typically, the first fluid phase is the transformer insulating oil and the second fluid phase is the gas volume contained within analysis components of the system.
- Sample gas extracted from sample fluid flowing through the
extractor assembly 10 is routed throughtubing 12 toanalytical instrument 14, which is an instrument configured for running automated qualitative and quantitative analysis of the gas samples delivered to it.Analytical instrument 14 may be one of several kinds of laboratory gas detection instrumentation, and is preferably a gas chromatograph that is designed for installation in a remote location and is automated by the control of a programmed computer.Analytical instrument 14 is thus referred to on occasion asgas chromatograph 14. Sample gas fromanalytical instrument 14 may be returned toextractor assembly 10 viatubing 13. - With reference to
FIG. 2 ,analytical instrument 14 is configured to work withcomputer systems 26 and external orremote communications equipment 32 so that analytical results may be acquired remotely. It should be noted that as used herein in the description of a preferred embodiment the word fluid refers to gases that flow through the instrument. However, the invention may be used with apparatus that use liquids and therefore the word fluid relates to any fluid that might be used in, and analyzed by, an analytical instrument. - As illustrated in
FIG. 2 ,gas chromatograph 14 is fluidly connected to a source of calibration gas (fluid) 16,extractor module 10, which is the source of a sample for test 18 (i.e., the samples of gas extracted from oil inelectrical device 3 that are to be analyzed), and acarrier fluid 20 which typically is supplied as a high pressure inert gas such as helium. Each of these sources of fluid (in this case the fluid is gaseous) is connected to a distribution manifold assembly, generally referenced withnumeral 22. The fluid connections between thesource fluids calibration fluid 16 to distribution manifold assembly 22), 25 (the connection from sample fortest 18 to distribution manifold assembly 22) and 27 (the connection fromcarrier fluid 20 to the distribution manifold assembly. These fluid lines are preferably stainless steel tubing. The fluid lines 24, 25 and 27 are fitted with appropriate passive fittings such as sealed compression ferrule-type fittings and the like. All connections betweenfluid lines distribution manifold 22, are fluid-tight connections with appropriate gaskets and 0-rings and the like. -
Distribution manifold assembly 22 does not form a part of the present invention and is not described in detail herein. However, a manifold assembly suitable for use with the present invention is described in detail in U.S. Pat. No. 6,391,096, which as noted above is incorporated herein by reference. Several components of the invention, including active fluid handling and control components are under the active control of acomputer 26.Computer 26 is connected to and sends command signals to and receives data from components associated withdistribution manifold assembly 22 by way of data lines 28.Computer 26 also controls operation ofanalytical instrument 14 through data lines 30.Computer 26 is connected to telephony or other remote or externalcommunications systems equipment 32 so thatcomputer 26 may be operated from a remote location, which thus allows the analytical instrument to be operated remotely and for data from the instrument to be acquired from a remote location.Computer 26 also controls the extractor control components which include circuitry and state machines that monitor and control thegas extraction module 10. - The word computer is used generically herein for a programmed device capable of controlling operations of
extractor assembly 10 andgas chromatograph 14.Computer 26 will be appreciated therefore to encompass any microprocessor, microcontroller or other processor and associated hardware and software. - Sample aliquots of fluid that are to be analyzed are acquired and controlled by the fluid control and handling components of extractor/
analyzer 1 and are injected into agas chromatograph 14. Thechromatograph 14 shown schematically inFIG. 1 is preferably a dual column chromatograph. The fluid control and handling components ofdistribution manifold assembly 22 fluidly route the sample aliquots to one of the selected separator columns. - Analyte separation in
chromatograph 14 is carried on under controlled conditions as is well known in the art. For instance, the separation columns in the chromatograph are contained within a temperature-controlled cabinet. Likewise, all components ofchromatograph 14 are contained within appropriate housings, none of which are shown in the figures but which will be understood as being necessary to perform reproducible and accurate analysis. -
Gas chromatograph 14, as shown schematically inFIG. 2 , includes a detector such as a thermal conductivity detector that is under the control ofcomputer 26. Analytes separated in the chromatographic columns flow into and through the detector. Fluid flowing through the system such as carrier fluid and analyzed sample are exhausted to the atmosphere atexhaust port 34. - Analytical data compiled by
gas chromatograph 14 from the analyzed sample is transmitted tocomputer 26 viadata lines 30 where it is further processed according to software stored in the computer. Analytical results may then be transmitted from thecomputer 26 throughremote communications equipment 32 on an automated basis, or the data may be acquired on prompt from a remote location. - The construction of
extractor assembly 10 will now be explained in detail with reference toFIGS. 3 and 4 . At times, relative directional terms are used to describe theextractor assembly 10 and the positions of various components relative to other structures. Thus, the word “inner” or “inward” refers to the structural or geometric center of theextractor assembly 10. The word “outer” refers to the direction away from the geometric center. An “inner-facing” surface is a surface that faces the center of the assembly, and so on. Referring toFIG. 3 ,assembly 10 includes a generallycylindrical housing 50 that includes afirst plate 52, asecond plate 54, and a scarfingring 56 sandwiched between the first and second plates. As detailed below, there are several component parts contained inhousing 50, including the components that facilitate extraction of gas from the electrical insulating oil that is fed intoextractor assembly 10, and various fluid flow paths for oil and extracted gas. Anoil pump 58 is mounted centrally tosecond plate 54 withbolts 55 such that the pump controls the flow of oil through theextractor assembly 10. Also mounted tosecond plate 54 is agas pump 60. Anoil temperature sensor 62 is mounted to a side ofsecond plate 54 and provides a means to monitor the temperature of oil or other fluid in thehousing 50—the temperature sensor is threaded into a cooperative threaded opening in the housing.Temperature sensor 62 is preferably a standard thermocouple but could be any appropriate temperature sensing device. Finally, anoil pressure transducer 64 is mounted to a side of thesecond plate 54 so that the oil pressure inhousing 50 may be monitored on an ongoing basis. The transducer also is threaded into a threaded opening in the housing. All of the foregoing components are attached to and under the control of thecomputer 26. - Shown schematically in
FIG. 3 because the “lower” side offirst plate 52housing 50 is not visible in the perspective view of the drawing are anoil inlet 66 and anoil outlet 68 that are both connected tofirst plate 52.Oil inlet 66 is connected to oilsample fluid line 4 andoil outlet 68 is connected to oilsample return line 5. As detailed below, oil fromelectrical device 3 flows in a loop beginning with the electrical device, delivered throughsample line 4 toextractor assembly 10 where gas in the oil is extracted, flows throughhousing 50, and is then returning to the electrical device viareturn line 5. Similarly, agas inlet 70 andgas outlet 72 are attached tosecond plate 54. The oil and gas inlets and outlets just described are standard fittings that are threaded into the first and second plates, respectively.Gas inlet 70 is connected totubing 13 and is thus the return line fromanalytical instrument 14. Thegas outlet 72 is connected totubing 12 and defines the sample delivery line to the analytical instrument. The gas extracted from oil flowing throughextractor assembly 10 is pumped withgas pump 60 throughoutlet 72, throughtubing 12 toanalytical instrument 14, and depending upon the state operation, may be returned toextractor assembly 10 viatubing 13 andinlet 70. - All fittings and connections to
housing 50 are leak free and utilize appropriate fittings and fluid-tight seal components such as O-rings and the like to ensure that there are no leaks. - Turning now to
FIG. 4 , components ofextractor assembly 10 will be described in detail. As noted previously, the primary components ofhousing 50 arefirst plate 52,second plate 54 and scarfingring 56. Each of first andsecond plates first plate 52 isfirst frit 74.First frit 74 is a porous disk material through which oil and/or other liquids readily flow.Frit 74 is preferably sintered bronze but may be fabricated from other porous materials including sintered glass, sintered metals, or wire mesh and other materials. In the assembledextractor assembly 10 thefirst side 76 offirst frit 74 is sealed around a perimeter thereof with adhesive to acooperative seat 77 on the inner-facing side offirst plate 52. Alternately, the seal between the first frit and the first plate may be facilitated with pressure applied between the two when the extractor assembly is bolted together. Adjacentfirst frit 74 isfirst membrane 78, which is attached and sealed around its perimeter in the manner described below to scarfingring 56. - Identical components are stacked in a mirror image of those just described on the opposite side of scarfing
ring 56. Thus, with continuing reference toFIG. 4 , asecond membrane 86 is attached and sealed around its perimeter to scarfingring 56. Aspacer layer 82 is positioned betweenfirst membrane 78 andsecond membrane 86.Spacer layer 82 provides a physical separation between the two membranes and is porous and inert to the analyte gases. Thespacer layer 82 is preferably a porous paper material that is not degraded by the kinds of gases that are extracted from oil in the system described herein; filter-type papers have been found to work well but there are numerous other materials such as cotton and other fibrous pads that will work. Thespacer layer 82 physically separates the twoadjacent membranes - A
second frit 88, which is an identical material to that described above with respect tofirst frit 74 is attached tosecond plate 54, again in a manner identical to that described above with respect tofirst frit 74. - The components just described and shown in exploded format in
FIG. 4 are sandwiched together in the assembledextractor 10 with a series of bolts 90 (one of which is shown inFIG. 4 ) around the perimeter of theplates ring 80 betweenfirst plate 52 and scarfingring 56, and a second O-ring 84 betweensecond plate 54 and the opposite side of scarfingring 56 insure that theextractor assembly 10 is leak-free when assembled. In addition, the O-rings reduce oxygen permutation from around the perimeter of themembranes - The first and
second membranes FIGS. 5A , 5B and 6.Membranes membrane 78 is molded by pressing fluorosilicone material that has been blended with polymerizing agents into a mold. The polymerized membrane is removed from the mold and is cured by baking at elevated temperatures. - More specifically, a predetermined mass of fluorosilicone material is preformed into a flattened disk. This pancake-shaped disk is then inserted into a compression mold where it is heated, squeezed and pressed into a very thin disk shape having the thickness attributes desired. The mold is maintained at an elevated pressure and temperature until the fluorosilicone material cures, at which time the part is removed from the mold.
- The
membrane 78 defines a generally flattened circular disk that has alip 100 defined around the outerperipheral edge 102. As best shown inFIG. 6 , the outerperipheral edge 102 ofmembrane 78 is relatively thicker than the central portions of the membrane. The thickness of the membrane is greatest near the outer peripheral edge and gradually is reduced moving toward the center of the membrane. The membrane material is thus relatively thicker at aperipheral portion 106 where the typical thickness is about 0.020 inches. The thickness of the membrane gradually decreases moving inwardly across thecentral portion 108 of the membrane toward the center of the membrane, where the membrane material is thinnest, typically about 0.004 inches. - The
lip 100 is configured to attach and seal to a cooperatively formedlip 104 on the inner-facing periphery ofplates 52 and 54 (FIG. 4 ). Thus, onFIG. 6 the area oflip 104 of scarfingring 56 to whichlip 100 on themembrane 78 attaches is shown schematically with dashed lines. Whenmembrane 78 is attached to plate 52, the membrane is stretched slightly so that the membrane material is slightly taught. This improves the fluid seal between the membrane and the plate to which it is attached, and removes any folds, wrinkles or creases in the membrane, which could cause a rupture or tear in the ultra-thin membrane web. Stretching the membrane in this manner thus improves the resistance of the membrane to development of leaks. -
Extractor assembly 10 is assembled with the components described above in the manner shown inFIG. 4 withbolts 90 so that the assembly is hermetically sealed and provides fluid-tight and leak free connections in all respects. Turning now toFIG. 7 , which is highly schematic in order to show the various flow paths,plates ring 56 define fluid flow paths through which oil and gas separated from the oil in theextractor assembly 10 flows. The flow paths throughplates ring 56 are defined by bores drilled through the plates. When the plates are assembled, the bores in the plates align and register with bores in the scarfing ring. O-rings are used to insure that the bores are leak free to define flow paths that are sealed. - Oil is delivered from
electrical device 3 throughsample line 4 and intoextractor assembly 10 viaoil inlet 66 and by virtue of operation ofpump 58, which is fluidly connected to the oil bores throughextractor assembly 10. InFIG. 7 , the oil flow path throughextractor assembly 10 is illustrated in dashed, relatively heavy, bold lines with solid arrowheads illustrating the general flow route. The oil flow path is assignedreference number 111. As noted previously,frit 74 is sealed tofirst plate 52 around the periphery of the frit disk, although this structural feature is not evident in the highly schematic view ofFIG. 7 . This defines a space 110 between the surface of the inner-facingside 76 of the frit 74 and outer-facing side ofmembrane 78 into which oil flows. The oil, which is under positive pressure by virtue of operation ofpump 58, flows through the center offrit 74 and then across the facing surfaces of the frit andmembrane 78. The oil tends to flow outwardly from the center of the membrane toward the outer periphery of the membrane and frit. Aperimeter groove 114 located on the inner-facing surface offirst plate 54 accumulates the oil. After the oil flows across the surface ofmembrane 78 and is returned to the transformer via bores that register with bores in scarfingring 56 andfirst plate 52. Theoil flow path 111 continues on the opposite side of scarfingring 56 intosecond plate 54 and into aspace 116 between the inner-facing surface offrit 88 and the outer-facing surface ofsecond membrane 86. As withfirst frit 74,frit 88 is readily permeable to oil, and the oil flows through the frit and along the surface of thesecond membrane 86. Again, the oil tends to flow outwardly from the center of the membrane toward the outer periphery of the membrane and frit wheregroove 120 on the inner-facing surface ofsecond plate 54 accumulates the oil. Oil flows through bores inplate 54 and scarfingring 56 that that register with bores infirst plate 52 to define a return flow path. The oil thus returns in a loop throughfirst plate 52, throughoutlet 68 and toelectrical device 3 byreturn line 5. - The oil flow through
extractor assembly 10 defines a first phase. Gas extracted from the oil in the first phase forms a second phase; the flow path for the gas is illustrated inFIG. 7 with relatively lighter dashed lines with line-style arrow heads and is assigned reference number 130. - If a diffusion gradient is created across the two different phase sides, which are separated by
first membrane 78 andsecond membrane 86, compounds of interest that exist in a higher concentration on one side of the membrane will diffuse across the membrane into the second phase side—the side with the lower concentration of that compound. That is, where oil in the first phase contains contaminants (such as fault gases) that are in relatively higher concentration on the first phase side than in the second phase, the contaminants diffuse across the phase barrier defined by the membranes to the second phase side (into thespace 122 occupied by the porous paper spacer 82). Said another way, the contaminants in the first phase diffuse across the phase barrier defined by the membranes and into the second phase, where they reliably and reproducibly accumulate and are representative of and proportional to the concentration of the contaminants in the first phase. This is schematically illustrated by the “bold-line” arrows representing oilphase flow path 111 and the dashed arrows 130 representing the second phase side, or gas phase flow 130. As oil under pressure circulates throughextraction apparatus 10, and more specifically, as the oil flows along the surfaces of the membranes, contaminants in the oil diffuse through the membranes and enter the gas phase 130. The contaminant (i.e., gas) diffusion acrossmembranes arrows 132. The gas phase flow path 130 is isolated from oilphase flow path 111 and is defined by bores defined inplates ring 56. As noted earlier,spacer 82 between theadjacent membranes space 122 into which the gas diffuses. Gas flow is initiated and maintained by a pump 60(FIG. 4 ). As best shown inFIG. 7 , sample gases fromanalytical apparatus 14enter extractor assembly 10 throughgas inlet 70 insecond plate 54, and into gas phase flow path 130 through the spacer 82 (gas space 122), throughgas pump 60 and is exhausted throughgas outlet 72 and returned toanalytical apparatus 14. - Operation of the system will now be detailed. As noted, oil flow is initiated by operation of
pump 58, causing oil to flow in a circulating loop through oilphase flow path 111. As oil flows through thefrits membranes space 122, which is defined by thespacer 82, and thus into gas phase flow path 130. The gas phase resulting from diffusion of gas molecules from the oil phase into the gas phase flows in a circulating loop throughgas chromatograph 14; gas is circulated with thegas pump 60. Circulation of the oil phase and gas phase is allowed to continue until equilibrium in the concentration of gas exists on both sides of the phase barriers defined bymembranes - During the normal operation it is possible for the oil phase pressure to be less than the gas phase pressure. This may occur for several reasons, including aberrations in the operating conditions of the oil pump, external interference, etc. If a negative pressure does occur on the oil phase side, the
membranes frits - Diffusion of compounds across the membranes is driven primarily by concentration gradients across the membranes. The time required to reach equilibrium or near equilibrium conditions depends upon factors such as gas concentration gradients and temperature, the volume of the gas being equilibrated, the thickness of the membrane, and the membrane surface area that is exposed to the oil. In addition, the flow rate of the oil carrying the gases affects the diffusion rate and thus the time required to reach equilibrium.
- As noted earlier, contaminants of interest contained in oil filled
device 3 are allowed to diffuse from the first liquid phase into the second fluid phase inextractor assembly 10. In this regard, during a sample equilibrium and acquisition phase oil is continuously circulated through theextractor assembly 10, returning as described earlier to the oil filleddevice 3. As the oil flows through the extractor assembly, dissolved gas contained in the oil diffuses across themembranes - As noted above, equilibrium and the rate of diffusion across the membranes are influenced by many different factors. In practice, it has been found that equilibrium using the
extractor assembly 10 described herein is achieved in about 15 minutes with a total nominal gas volume of less than 7 cm3I. This may be contrasted with the gas extraction apparatus described in the '105 and '096 patents, which required up to and greater than 1 hour with a nominal gas volume of up to 65 ml. It is apparent therefore that the present invention requires magnitudes less time to equilibrate, and magnitudes less volume of gas extracted from the oil phase than required by the patents just mentioned. - When
computer 26 determines that it is appropriate to inject a sample of gas from the second phase intoanalytical instrument 14, or whencomputer 26 is prompted to do so externally, the continuous circulating loop of gas 130 is switched indistribution manifold 22 so that the sample gas is routed to theanalytical instrument 14. - Typically simultaneously with the equilibration and sample acquisition step, and prior to operation of
chromatograph 14, the system allows equilibration of thechromatograph 14 withpure carrier fluid 20, which as noted is typically an inert gas such as helium. This allows any fluid in the separation columns to elute and be flushed through the instrument and to be vented to atmosphere at 34. Sample gas is then injected into the chromatograph and gases present in the sample are qualitatively and quantitatively analyzed. - In the illustrated embodiment of the
extractor 10 described above and shown in the attached drawings, the extractor uses two membranes housed in a housing defined by two plates and a scarfing ring. It will be appreciated that the fluid flow paths through the plates are configured so that additional pairs of plates, membranes and a scarfing ring may be stacked so that the capacity of the system and its speed increase. Thus, an extractor module may be defined as two membranes, two plates and a single scarfing ring. Multiple extractor modules may be stacked with the fluid pathways between modules communicating. - Similarly, an extractor module according to the present invention may be made using a single membrane. In this case, the extractor module is configured as shown in the figures with only a single membrane. The oil phase containing contaminants flows over the first side of a single membrane and the contaminants diffuse through the
membrane 78 into a space defined by aspacer layer 82 that is positioned on the opposite side ofmembrane 78, thereby defining the physical separation between thesingle membrane 78 and the opposite wall of the module housing. As with the embodiment ofFIG. 4 , thespacer layer 82 physically separates thesingle membrane 78 from the adjacent wall of the module housing and thereby defines a second phase space through which gas extracted from oil may flow. - In view of the many possible embodiments to which the principles of our invention may be applied, it should be recognized that the detailed embodiments are illustrative only and should not be taken as limiting the scope of the invention. Rather, we claim as our invention all such embodiments as may come within the scope and spirit of the following claims and equivalents thereto.
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US20100090543A1 (en) * | 2008-10-10 | 2010-04-15 | General Electric Company | Portable transformer and method for improving reliability of electric power delivery |
US20120247327A1 (en) * | 2010-09-27 | 2012-10-04 | Conocophillips Company | Hollow-fiber membrane contactors |
US9176107B2 (en) * | 2012-02-01 | 2015-11-03 | Lumasense Technologies Holdings, Inc. | System and method for monitoring asset health by dissolved gas measurement |
CA2887635C (en) * | 2012-10-11 | 2021-01-26 | Siemens Healthcare Diagnostics Inc. | Automation maintenance carrier |
CN103776958B (en) * | 2012-10-19 | 2015-07-29 | 深圳市深安旭传感技术有限公司 | Simple and easy fluid circulating device |
US8999723B2 (en) * | 2013-05-03 | 2015-04-07 | Serveron Corporation | Transformer hydrogen indicator |
DE102013112823B3 (en) | 2013-11-20 | 2015-03-26 | Maschinenfabrik Reinhausen Gmbh | Apparatus and method for the detection of gas |
CH709526A2 (en) * | 2014-03-31 | 2015-10-15 | Inrag Ag | Device for extraction and analysis of gases. |
CN104048865B (en) * | 2014-06-13 | 2016-04-06 | 国网四川省电力公司双流县供电分公司 | The separating mechanism of gas in transformer insulation oil |
FI127084B (en) * | 2014-08-18 | 2017-11-15 | Vaisala Oyj | Method and system for extracting gas or gas mixtures for analyzing dissolved gas or gas mixture from a liquid |
DE202014104979U1 (en) | 2014-10-17 | 2014-12-08 | Bürkert Werke GmbH | degassing |
US10024836B2 (en) * | 2015-03-26 | 2018-07-17 | General Electric Company | Trace gas measurement apparatus for electrical equipment |
US9874497B2 (en) | 2015-04-02 | 2018-01-23 | General Electric Company | Trace gas measurement apparatus for electrical equipment |
US10586649B2 (en) * | 2017-03-13 | 2020-03-10 | Abb Schweiz Ag | Dissolved gas analysis devices, systems, and methods |
CN110988287B (en) * | 2019-12-23 | 2022-08-26 | 中国科学院合肥物质科学研究院 | Water-gas separation device suitable for deep water high-pressure environment |
CN117388444B (en) * | 2023-12-08 | 2024-03-01 | 陕西省环境调查评估中心 | Air detector |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5064593A (en) * | 1989-12-07 | 1991-11-12 | Daikin Industries Ltd. | Process for producing multilayer polytetrafluoroethylene porous membrane |
US5123937A (en) * | 1989-02-03 | 1992-06-23 | Japan Gore-Tex Inc. | Deaerating film and deaerating method |
US5225131A (en) * | 1989-12-07 | 1993-07-06 | Daikin Industries, Ltd. | Process for producing multilayer polytetrafluoroethylene porous membrane and semisintered polytetrafluoroethylene multilayer structure |
US5326385A (en) * | 1992-02-24 | 1994-07-05 | Shell Oil Company | Method of treating sour liquefied petroleum gas |
US5980617A (en) * | 1998-02-09 | 1999-11-09 | Hellerman; Lance W. | Gas processing contactor tower |
US6432051B1 (en) * | 1998-03-13 | 2002-08-13 | Instrumentarium Corp. | Tonometric measuring head and measuring method |
US6517919B1 (en) * | 1998-07-10 | 2003-02-11 | Donaldson Company, Inc. | Laminate and pulse jet filter bag |
US6521024B1 (en) * | 1999-03-18 | 2003-02-18 | Nok Corporation | Seal plate and pressure adjusting mechanism for the seal plate |
Family Cites Families (59)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3523408A (en) | 1968-04-02 | 1970-08-11 | Pall Corp | Gas separator |
US4070167A (en) | 1976-03-08 | 1978-01-24 | Eastman Kodak Company | Sonic apparatus for removing gas from photographic emulsion |
NL7602387A (en) | 1976-03-08 | 1977-09-12 | Nkf Kabel Bv | INSTALLATION FOR DRYING AND DEGASING OF OIL, IN PARTICULAR CABLE OIL. |
US4236404A (en) | 1976-08-31 | 1980-12-02 | General Electric Company | Device for monitoring dissolved gases in electrical insulating liquids such as transformer oils |
US4112737A (en) | 1977-04-27 | 1978-09-12 | Morgan Schaffer Corporation | Transformer fault detection |
CA1167279A (en) | 1980-05-20 | 1984-05-15 | Katuo Sugawara | System for monitoring abnormality of oil-filled electric devices |
DE3023383A1 (en) | 1980-06-23 | 1982-01-14 | Hewlett Packard Gmbh | DEVICE FOR SOLVENT DEGASSING AND SOLVENT REFILLING IN LIQUID CHROMATOGRAPHS |
US4461165A (en) | 1980-06-27 | 1984-07-24 | Scottish & Newcastle Breweries Limited | Method of and apparatus for monitoring concentration of gas in a liquid |
US4561886A (en) * | 1980-10-14 | 1985-12-31 | Geskin Ernest S | Method of heating, melting and coal conversion and apparatus for the same |
DE8102504U1 (en) | 1981-01-31 | 1981-07-09 | Sartorius GmbH, 3400 Göttingen | FILTRATION DEVICE FOR FLAT FILTER CUTTINGS |
US4409814A (en) | 1981-02-06 | 1983-10-18 | Tokyo Shibaura Denki Kabushiki Kaisha | Gas extracting device |
US4385909A (en) | 1981-08-31 | 1983-05-31 | Starr Hydraulic-Electro Controls Co. | De-aerator for hydraulic power units |
US4437082A (en) | 1982-07-12 | 1984-03-13 | Westinghouse Electric Corp. | Apparatus for continually upgrading transformer dielectric liquid |
CS234325B1 (en) | 1982-11-03 | 1985-04-16 | Josef Altmann | Method of oil charge vacuum cleaning and equipment for application of this method |
JPS59119304U (en) | 1983-01-29 | 1984-08-11 | 株式会社エルマ | Dissolved gas deaerator in liquid |
IN162484B (en) | 1983-10-03 | 1988-06-04 | Pall Corp | |
US4498992A (en) | 1984-02-09 | 1985-02-12 | Petro-Williams Service Company | Process for treating contaminated transformer oil |
DE3569827D1 (en) | 1984-10-25 | 1989-06-01 | Bbc Brown Boveri & Cie | Device for determining the quantitative composition of gases |
DE3534218A1 (en) | 1984-11-13 | 1987-03-26 | Licentia Gmbh | METHOD FOR PURIFYING SILICON OIL |
US4834877A (en) | 1985-08-09 | 1989-05-30 | The Dow Chemical Company | Apparatus for membrane-permeation separations using segmented flow |
GB8521607D0 (en) | 1985-08-30 | 1985-10-02 | Shell Int Research | Separation of solvents from hydrocarbons |
US4763514A (en) | 1986-05-14 | 1988-08-16 | Mitsubishi Denki Kabushiki Kaisha | Monitoring equipment for dissolved gas in insulating oil |
JPS6382342A (en) | 1986-09-26 | 1988-04-13 | Polyurethan Eng:Kk | Measurement for amount of gas in liquid mixed therewith |
US4890478A (en) | 1987-09-11 | 1990-01-02 | Westinghouse Electric Corp. | Gas-in-oil monitoring apparatus and method |
US4952751A (en) | 1988-04-08 | 1990-08-28 | Membrane Technology & Research, Inc. | Treatment of evaporator condensates by pervaporation |
US5034126A (en) | 1990-01-29 | 1991-07-23 | The Dow Chemical Company | Counter current dual-flow spiral wound dual-pipe membrane separation |
US5154832A (en) | 1990-02-27 | 1992-10-13 | Toray Industries, Inc. | Spiral wound gas permeable membrane module and apparatus and method for using the same |
US5104810A (en) | 1990-06-27 | 1992-04-14 | United Technologies Corporation | Zero gravity purge and trap for monitoring volatile organic compounds |
US5183486A (en) | 1990-12-04 | 1993-02-02 | Spectra-Physics, Inc. | Apparatus for degassing a liquid |
DE4101777A1 (en) | 1991-01-22 | 1992-08-06 | Siemens Ag | X-RAY HEATER WITH DEGASSING DEVICE |
CA2061039C (en) | 1991-02-15 | 1997-04-29 | Masatoshi Hikosaka | Process gas chromatographic system |
US5442948A (en) | 1991-04-01 | 1995-08-22 | The United States Of American As Represented By The Secretary Of The Navy | Apparatus and method for determining amount of gases dissolved in liquids |
GB9113067D0 (en) | 1991-06-18 | 1991-08-07 | Nat Grid Company The Public Li | Determining the volume of gases in transformer cooling oil |
US5403475A (en) | 1993-01-22 | 1995-04-04 | Allen; Judith L. | Liquid decontamination method |
US5340384A (en) | 1993-03-05 | 1994-08-23 | Systec, Inc. | Vacuum degassing |
US5372634A (en) | 1993-06-01 | 1994-12-13 | The United States Of America As Represented By The Secretary Of The Navy | Sonic apparatus for degassing liquids |
JPH0760005A (en) | 1993-08-31 | 1995-03-07 | Miura Co Ltd | Dearation of liquid product |
US5400641A (en) | 1993-11-03 | 1995-03-28 | Advanced Optical Controls, Inc. | Transformer oil gas extractor |
US5509954A (en) | 1994-03-28 | 1996-04-23 | Nordson Corporation | Method and apparatus for degassing high viscosity fluids |
US6165253A (en) | 1994-05-23 | 2000-12-26 | New Jersey Institute Of Technology | Apparatus for removal of volatile organic compounds from gaseous mixtures |
DE4427013A1 (en) | 1994-07-29 | 1996-02-01 | Loctite Europa Eeig | Method and device for removing gas bubbles from a viscous liquid to be dispensed |
TW354259B (en) * | 1994-11-03 | 1999-03-11 | Uroscientific Inc | Urethra control system the invention relates to an involunary urine control system |
DE4446270C1 (en) | 1994-12-23 | 1996-02-29 | Hewlett Packard Gmbh | Liquid chromatography de-gasifier |
US5567868A (en) | 1995-01-23 | 1996-10-22 | Hewlett-Packard Company | Planar manifold assembly |
US5753126A (en) | 1995-06-29 | 1998-05-19 | Sandia Corporation | System for increasing corona inception voltage of insulating oils |
US5808179A (en) | 1995-09-29 | 1998-09-15 | Rosemount Analytical Inc. | Modular gas chromatograph |
US5762684A (en) | 1995-11-30 | 1998-06-09 | Dainippon Screen Mfg. Co., Ltd. | Treating liquid supplying method and apparatus |
JP2969075B2 (en) | 1996-02-26 | 1999-11-02 | ジャパンゴアテックス株式会社 | Degassing device |
US5659126A (en) | 1996-04-19 | 1997-08-19 | Farber; Milton | Gas chromatograph techniques for on-line testing of transformer faults |
US5663492A (en) | 1996-06-05 | 1997-09-02 | Alapati; Rama Rao | System for continuous analysis and modification of characteristics of a liquid hydrocarbon stream |
US5749945A (en) | 1996-07-22 | 1998-05-12 | Beck; Earl Joseph | Apparatus for rapidly degassing and decontaminating liquids |
US5749942A (en) | 1997-02-14 | 1998-05-12 | Raychem Corporation | Apparatus for extracting a gas from a liquid and delivering the gas to a collection station |
US6123937A (en) * | 1997-03-14 | 2000-09-26 | Nika Health Products, Limited | Applications of lysozyme dimer |
US5988703A (en) | 1997-07-31 | 1999-11-23 | Hewlett-Packard Company | Fluid connector system for a planar manifold assembly |
DE69828594T2 (en) | 1998-07-17 | 2005-06-16 | Agilent Technologies Inc., A Delaware Corp., Palo Alto | Device for degassing liquids |
US6365105B1 (en) | 2000-03-17 | 2002-04-02 | Serveron Corporation | Fluid handling apparatus |
US6391096B1 (en) | 2000-06-09 | 2002-05-21 | Serveron Corporation | Apparatus and method for extracting and analyzing gas |
US6526805B1 (en) | 2000-08-11 | 2003-03-04 | General Electric Co. | Apparatus for continuously determining volatile substances dissolved in insulating fluid |
US7114621B2 (en) | 2001-12-14 | 2006-10-03 | 3M Innovative Properties Company | Membrane module elements |
-
2008
- 2008-06-12 US US12/137,658 patent/US8075675B2/en active Active
-
2009
- 2009-06-05 CN CN200980122124.4A patent/CN102065969B/en active Active
- 2009-06-05 WO PCT/US2009/003413 patent/WO2009151557A1/en active Application Filing
-
2011
- 2011-11-15 US US13/296,318 patent/US8142547B1/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5123937A (en) * | 1989-02-03 | 1992-06-23 | Japan Gore-Tex Inc. | Deaerating film and deaerating method |
US5064593A (en) * | 1989-12-07 | 1991-11-12 | Daikin Industries Ltd. | Process for producing multilayer polytetrafluoroethylene porous membrane |
US5225131A (en) * | 1989-12-07 | 1993-07-06 | Daikin Industries, Ltd. | Process for producing multilayer polytetrafluoroethylene porous membrane and semisintered polytetrafluoroethylene multilayer structure |
US5326385A (en) * | 1992-02-24 | 1994-07-05 | Shell Oil Company | Method of treating sour liquefied petroleum gas |
US5980617A (en) * | 1998-02-09 | 1999-11-09 | Hellerman; Lance W. | Gas processing contactor tower |
US6432051B1 (en) * | 1998-03-13 | 2002-08-13 | Instrumentarium Corp. | Tonometric measuring head and measuring method |
US6517919B1 (en) * | 1998-07-10 | 2003-02-11 | Donaldson Company, Inc. | Laminate and pulse jet filter bag |
US6521024B1 (en) * | 1999-03-18 | 2003-02-18 | Nok Corporation | Seal plate and pressure adjusting mechanism for the seal plate |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11275060B2 (en) * | 2017-08-14 | 2022-03-15 | Trasis S.A. | Device for preparing a liquid sample for a gas chromatograph |
Also Published As
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CN102065969B (en) | 2014-04-09 |
US20090308246A1 (en) | 2009-12-17 |
WO2009151557A1 (en) | 2009-12-17 |
US8142547B1 (en) | 2012-03-27 |
CN102065969A (en) | 2011-05-18 |
US8075675B2 (en) | 2011-12-13 |
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