EP2662565A1 - Kompressionvorrichtung für Kryogenflüssigstrahlanlage - Google Patents

Kompressionvorrichtung für Kryogenflüssigstrahlanlage Download PDF

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Publication number
EP2662565A1
EP2662565A1 EP13162045.2A EP13162045A EP2662565A1 EP 2662565 A1 EP2662565 A1 EP 2662565A1 EP 13162045 A EP13162045 A EP 13162045A EP 2662565 A1 EP2662565 A1 EP 2662565A1
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EP
European Patent Office
Prior art keywords
fluid
compartment
flow
tongue
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13162045.2A
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English (en)
French (fr)
Other versions
EP2662565B1 (de
Inventor
Frédéric Richard
Jacques Quintard
Charles Trouchot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of EP2662565A1 publication Critical patent/EP2662565A1/de
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Publication of EP2662565B1 publication Critical patent/EP2662565B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F04B39/041—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes

Definitions

  • An improved piston compression device is provided by a more reliable and rapid detection of leaks that may occur around said piston.
  • the invention further relates to a working installation by high-pressure cryogenic fluid jet whose operation is improved and made safer by the use of a compression device according to the invention, which installation is suitable for and designed to perform surface treatment, stripping, cleaning, scraping or cutting of a material.
  • coated or uncoated materials in particular the stripping of paint, coating or the like, the peeling or the like, in particular of concrete, the cutting of a material, etc. may be carried out using jets cryogenic under very high pressure, as proposed by the documents US Patent 7,310,955 and US Patent 7,316,363 .
  • one or more jets of cryogenic fluid under high pressure are typically used at a pressure of 300 to 5000 bar, typically between 1000 and 4000 bar, and at a cryogenic temperature of, for example, between: 100 and - 200 ° C, typically between -140 and -160 ° C, which are distributed by one or more nozzles animated or not of a rotary movement or an oscillation movement.
  • a method of working by jets of high pressure cryogenic fluid in particular a method of surface treatment, stripping, scraping, cleaning or cutting of a material is carried out by means of a working installation suitable for and designed to produce jets of high pressure cryogenic fluid.
  • this type of working installation comprises fluid supply means, comprising in particular a cryogenic fluid reservoir at low pressure, typically between 3 and 6 bar, for example nitrogen in the liquid state, and least one fluid supply conduit, which supply means feeds an internal heat exchanger and a first compression device adapted to and adapted to compress the cryogenic fluid at a first pressure typically up to 1000 bar.
  • fluid supply means comprising in particular a cryogenic fluid reservoir at low pressure, typically between 3 and 6 bar, for example nitrogen in the liquid state, and least one fluid supply conduit, which supply means feeds an internal heat exchanger and a first compression device adapted to and adapted to compress the cryogenic fluid at a first pressure typically up to 1000 bar.
  • the cryogenic fluid compressed at the first pressure then feeds, via at least one other fluid supply conduit, a second compression device adapted to and designed to compress the cryogenic fluid at the first pressure at a second pressure.
  • a second compression device adapted to and designed to compress the cryogenic fluid at the first pressure at a second pressure.
  • said second pressure typically up to 5000 bar, preferably up to 4000 bar.
  • the fluid compressed at the second pressure is then conveyed via a conveyor line to an external heat exchanger where it undergoes cooling.
  • the second compression device comprises a compression compartment in which the cryogenic fluid to be compressed is located. Compression of the fluid is performed by a compression piston movable in translation in the compression compartment, which piston is arranged in a passage in a wall of said compartment.
  • sealing means typically a gasket, generally a seal formed of a plastic material with a metal strapping, are arranged around the piston, at the passage formed in a wall of the compartment in which is the compression of the fluid.
  • sealing means are adapted to and designed to ensure a fluidic seal between the inside and the outside of the compartment, the outside of the compartment being generally at atmospheric pressure.
  • the seal of the second compression device is subjected to high thermal and mechanical stresses which cause a term wear, or even complete failure, of the seal.
  • the seal is subjected to repeated thermal cycles resulting from compression cycles. Indeed, during the filling of the cryogenic fluid in the compression compartment, the fluid is at cryogenic temperature, while after compression, the fluid has a temperature close to room temperature.
  • the wear of the seal progressively alters its fluidic sealing performance. It follows leakage of fluid at the passageway arranged in a wall of the compression compartment of the compression device, and therefore a loss of efficiency of said device, in particular a decrease in the pressure of compressed fluid in the compression compartment.
  • the frequency of the translational movement of the piston is typically of the order of 25 strokes per minute, i.e., round trips of the piston per minute.
  • the machine When a significant decrease in the compressed fluid pressure in the compression chamber occurs, for whatever reason, the machine continues to operate, i.e. deliver the cryogenic fluid to the compression chamber and to compress it.
  • the frequency of piston movement increases until the set pressure is again reached. This can occur during transient drops in the fluid pressure in the compression compartment or even when the machine is started before the pressure is established, and can regulate the pressure of the cryogenic fluid dispensed by the installation of work .
  • the problem to be solved is therefore to propose a compression device, in particular a cryogenic fluid compression device, which is improved in such a way as to greatly reduce or even eliminate the aforementioned problems, and which is also of a complexity of implementation. reduced implementation and improved efficiency compared to the solutions of the prior art.
  • an object of the invention is to provide a working installation by jets of cryogenic fluid under high pressure whose operation is improved and made safer than in the prior art.
  • the solution of the invention is then a compression device comprising a first compartment, a second compartment comprising a peripheral wall secured to the first compartment, a passage being arranged between the first and second compartments, a piston arranged in the passage and movable in translation. in at least a portion of the first and second compartments and sealing means arranged around the piston at the passage so as to ensure, under normal conditions of use, a fluidic seal between said first and second compartments, the second compartment further comprising at least one exhaust port provided in the peripheral wall of the second compartment and fluid flow detecting means arranged at the exhaust port for detecting a flow of escaping fluid the second compartment through the exhaust port and resulting from a flow of fluid passing from the first compartment to the second compartment through the passage in the event of fluidic leakage between the first and second compartments, characterized in that the means for detecting a fluid flow comprise a microswitch comprising at least two poles and a tongue actuatable under the effect of a pressure exerted by a fluid flow on said tongue so that the tongue
  • the invention also relates to a working installation using at least one cryogenic fluid jet under high pressure comprising at least one nozzle for dispensing a fluid jet, means for supplying fluid , whose start and stop are controlled by a first control, at least one compression unit supplied with fluid by the supply means and an external heat exchanger, the compression unit comprising at least a first and a second compression devices, which second compression device comprises a first and a second compartment, a piston, a second control controlling the setting in motion and / or stopping of the piston and an internal heat exchanger, the at least one central compressor and heat exchanger cooperating with the feed means fluid for supplying the at least one nozzle for dispensing a fluid jet characterized in that the second compression device is according to one of the preceding claims.
  • the second compression device comprises means for detecting a flow of fluid electrically connected to the first and second controls, said detection means comprising a microswitch comprising at least two electric poles and a tongue that can be actuated under the effect a pressure exerted by a flow of fluid on said tongue so that the tongue ensures or interrupts an electrical contact between said electric poles when a flow of fluid escapes from the first compartment to the second compartment and triggers the stopping the translation movement of the piston and stopping the supply of fluid.
  • said detection means comprising a microswitch comprising at least two electric poles and a tongue that can be actuated under the effect a pressure exerted by a flow of fluid on said tongue so that the tongue ensures or interrupts an electrical contact between said electric poles when a flow of fluid escapes from the first compartment to the second compartment and triggers the stopping the translation movement of the piston and stopping the supply of fluid.
  • the fluid dispensed by the working installation according to the invention is at a pressure between 300 and 5000 bar, preferably between 1000 and 4000 bar, and at a temperature between -100 ° C and -200 ° C, preferably between -140 ° C and - 160 ° C.
  • the installation according to the invention is suitable for and designed to perform a surface treatment, stripping, cleaning, scraping or cutting of a material.
  • a piston compression device generally comprises a first compartment 7 secured to a second compartment 8, a first compartment 7 being the compression compartment, that is to say the compartment supplied with fluid 20 and in which is carried out the compressing said fluid 20.
  • the first and second compartments 7, 8 may be two pieces assembled mechanically, for example by threading as illustrated on the Figure 2 , or by any other means of assembly.
  • the first and second compartments 7, 8 are parts of revolution each comprising a recess and of cylindrical shape, and arranged coaxially.
  • the material used for the manufacture of the first and second compartments 7, 8 is type 316 stainless steel.
  • a passage 16 is arranged between the first and second compartments 7, 8 and a compression piston 5 is arranged in the passage 16.
  • Sealing means 4 are arranged around the piston 5 at the passage 16 so as to ensure, under normal conditions of use, a fluidic seal between said first and second compartments 7, 8.
  • the sealing means 4 comprise a seal.
  • the seal is formed of 3 parts consisting of a lip seal of polymer material, a ring of polymer material and a ring of metallic material.
  • the sealing means 4 comprise a stop ring 3 and a retaining ring 6 arranged at the passage 16, around the piston 5, so as to maintain the seal in position.
  • the rings 3 and 6 are formed of a metallic material.
  • the ring 3 is made of bronze and the ring 6 of 316 stainless steel.
  • the sealing means 4 provide a fluidic seal between the compartments 7, 8 and also serves to guide the piston 5, which piston 5 is movable in translation in at least a portion of the first and second compartments 7, 8 and means of 4. It is specified that the compression piston 5 is generally moved by a hydraulic piston 5a arranged in the second compartment 8.
  • the piston 5 is generally formed of a material of the ceramic type.
  • the piston 5 is able to move in axial translation along the axes of symmetry of the first and second compartments 7, 8, which axes are preferably merged. More precisely, the piston 5 is able to move between at least two positions: a retracted position (shown schematically in Figure 1 ) according to which the major part of the piston 5 is arranged in the second compartment 8 and an extended position (shown schematically in FIG. Figure 2 ) according to which the piston 5 is translated towards the first compartment 7 with respect to its retracted position.
  • a retracted position shown schematically in Figure 1
  • an extended position shown schematically in FIG. Figure 2
  • the second compartment 8 further comprises at least one exhaust port 9 arranged in the peripheral wall 1 of the second compartment 8.
  • the orifice 9 is opening and fluidly communicates the interior, i.e., the internal volume, of the second compartment 8, with the exterior of said compartment.
  • the pressure prevailing inside the second compartment 8 is of the order of atmospheric pressure.
  • the piston 5 being moved by a hydraulic piston 5a, the free volume of the compartment 8 varies depending on the compression cycle. In other words, when the piston 5 compresses the cryogenic fluid, the free volume of the compartment 8 decreases and air is discharged through the at least one orifice 9. Conversely, when the piston 5 returns to the retracted position, the outside air to the second compartment 8 is sucked through the orifice 9.
  • the compression device compresses a fluid 20 in the first compartment 7 when the piston 5 translates towards the first compartment 7 until it is in its extended position.
  • the present invention proposes to arrange means 11 for detecting a fluid flow at the exhaust orifice 9 so as to detect a fluid flow escaping from the second compartment 8 by orifice 9, as illustrated by the Figures 3a and 3b which schematize a preferred embodiment of the present invention.
  • means 11 for detecting a flow of fluid it is meant any device for detecting a flow of fluid making it possible to detect a flow of fluid escaping from the second compartment 8 through the orifice 9.
  • the means 11 for detecting a fluid flow 20 are adapted to and designed to detect a flow of fluid escaping from the second compartment 8 through the exhaust port 9 and resulting from a flow of fluid 20 passing from the first compartment 7 to the second compartment 8 through the passage 16, in the event of a fluid leakage fault between the first and second compartments 7, 8.
  • the fluid escaping through the orifice 9 is in the gaseous state.
  • a flow of fluid 20 passing from the first compartment 7 to the second compartment 8 generates a flow of fluid 20 escaping from the orifice 9, and circulating from the inside of the compartment 8 towards the outside of the compartment 8, in the direction of means 11 for detecting a fluid flow.
  • the lower pressure value, the lower flow rate value or the lower measurable fluid velocity value determine the sensitivity of the detection means 11.
  • the sensitivity of the detection means 11 is adjusted so that the lowest pressure value, the smallest flow value or the lowest measurable fluid velocity value are respectively greater than a pressure detection threshold, a threshold detection rate or a predetermined speed detection threshold.
  • the detection means 11 are preferably adapted to and designed to detect a flow of fluid 20 whose pressure, flow rate or velocity at the level of the detection means 11 is greater than a detection threshold under pressure, a threshold of detection in flow rate or a predetermined speed detection threshold.
  • these predetermined detection thresholds will be adjusted according to the characteristics of the compression device of the invention, in particular the pressure prevailing in the first compartment 7, the number of orifices 9 arranged on the second compartment 8.
  • the values of these detection thresholds may be predetermined empirically, during routine tests conducted under different conditions of use of the compression device of the invention, for example different pressure values prevailing in the first compartment 7, different numbers of orifices 9 arranged on the second compartment 8, ...
  • the sensitivity of the detection means 11 is adjusted so that the predetermined detection thresholds in pressure, flow rate or fluid velocity are respectively greater than the pressure, flow or velocity variations resulting from the low air flow. generated by the movement of the hydraulic piston 5a.
  • the detection means 11 are preferably adapted to and designed to detect only a flow of fluid 20 whose pressure, flow rate or speed at the level of the detection means 11 is greater than the pressure, the flow rate or the speed a slight flow of air escaping through the orifice 9 during the movement of the hydraulic piston 5a in the second compartment 8, towards the first compartment 7.
  • the means 11 for detecting a fluid flow 20 comprise a device of the micro-switch type.
  • microswitch means a device comprising at least two electric poles and a tongue 12 actuable under the effect of a pressure exerted by a fluid flow 20 on said tongue 12.
  • microswitch in particular the lift of the tongue 12 and the distance separating the contact points of the tongue with the electric poles of the microswitch, makes it possible to adjust the sensitivity of the microswitch.
  • microswitch micro-switch type miniature lever or lever brand Cherry and marketed under the DG13-B3LA reference can be used.
  • the microswitch 11 is arranged at the orifice 9 so that the tongue 12 provides electrical contact between said electric poles when a flow of fluid 20, preferably nitrogen, escapes through the exhaust port 9 and presses on the tongue 12.
  • the second compartment 8 of the compression device of the invention advantageously comprises means 11 for detecting a flow of fluid 20, electrically powered, said means being adapted to and designed to produce an electric alarm signal when a flow of fluid 20 escaping from the second compartment 8 through the orifice 9 is detected.
  • the electrical signal produced by the means 11 makes it possible to trigger the stopping of the operation of the compression device of the invention, notably stopping the translation movement of the piston 5 and stopping the supply of fluid 20 the second compression compartment 8.
  • the device of the invention is fluidly connected to fluid supply means 20 whose start or stop are controlled by a first command.
  • the setting in translation movement or the stopping of the piston 5 is controlled by a second command.
  • the means 11 for detecting a fluid flow 20 are then electrically connected to the first and second controls by at least one electrical cable 13 so that the electrical alarm signal produces when a flow of fluid escapes from the second compartment 8 through the orifice 9 triggers the stop of the translational movement of the piston 5 and the stoppage of the fluid supply 20.
  • the microswitch 11 is arranged at the orifice 9 so that the tongue 12 interrupts an electrical contact initially established between said electrical poles when a flow of fluid 20, preferably nitrogen, escapes through the exhaust port 9 and presses on the tongue 12.
  • the interruption of the electrical contact between the electric poles of the microswitch 11 makes it possible to trigger the stopping of the operation of the compression device of the invention, in particular the stopping of the translational movement of the piston 5 and the stopping of the fluid supply 20 of the second compression compartment 8.
  • the device of the invention is fluidly connected to fluid supply means 20 whose start or stop are controlled by a first command.
  • the setting in translation movement or the stopping of the piston 5 is controlled by a second command.
  • the means 11 for detecting a fluid flow 20 are then electrically connected to the first and second controls by at least one electrical cable 13, thus forming a closed electrical circuit.
  • the pressure exerted on the tongue 12 of the microswitch when a flow of fluid escapes from the second compartment 8 through the orifice 9 then opens the circuit and triggers the stopping of the translational movement of the piston 5 and the stopping of the fluid supply 20.
  • the pressure sensing thresholds of the microswitch are advantageously chosen so that the microswitch is adapted to and designed to detect only a fluid stream exerting a pressure at the level of the means 11 greater than that exerted by the slight air flow resulting from the movement of the hydraulic piston 5a in the second compartment 8.
  • the slight air flow resulting from the movement of the hydraulic piston 5a in the second compartment 8 does not exert sufficient pressure for the tongue 12, as the case may be, to contact or interrupt the electrical poles of the microswitch. .
  • the microswitch is advantageously characterized by a trigger threshold opening or closing non-zero electrical contact, said otherwise by a minimum force necessary to actuate the tab 12 non-zero.
  • this threshold or this force is at least 0.1 N, more preferably at least 0.4 N, typically of the order of 0.44 N.
  • the electric poles of the microswitch each form the terminals of an electrical circuit which is open. in normal operation of the compression device, and which can be closed by displacement of the tongue 12 under the effect of a flow of fluid escaping through the orifice 9.
  • the electrical poles of the micro-breaker each form the terminals of an electric circuit which is closed during normal operation of the compression device, and which can be opened by displacement of the tongue 12 under the effect of a flow. of fluid escaping through the orifice 9.
  • the tongue 12 thus serves as a switch.
  • the invention therefore has the advantage of requiring no other electrical alarm trigger device that the tab of the microswitch itself, nor any intermediate mechanical device.
  • the detection of a leak occurring at the level of the sealing means 4 and generating the escape of a fluid stream 20 through the orifice 9 triggers in a simple and fast manner the stopping of the compression device , in particular stopping the movement of the piston through the sealing means 4 and stopping the supply of the first compartment 7 with fluid 20.
  • the device of the invention is adapted to and designed to compress a fluid 20 in the second compartment 8 by translation of the piston 5 towards the second compartment 8, the initial pressure of fluid 20 being between 200 and 1500 bar and the compressed fluid pressure being between 300 and 5000 bar, preferably up to 4000 bar.
  • one or more exhaust ports 9 may be arranged in the peripheral wall 1 of the second compartment 8.
  • these orifices 9 have diameters of between 9 and 10 mm, more preferably of the order of 9.7 mm.
  • all or part of the orifices 9 may be provided with fluid flow detection means 11 according to the invention.
  • the orifices which are not provided with means 11 may be plugged, so as to increase the flow of fluid escaping from one or orifices provided with means 11, or left free.
  • the device of the invention is preferably adapted to and designed to compress a fluid 20 in the first compartment 7 in the liquid state, the fluid 20 passing from the first compartment 7 to the second compartment 8 and escaping from the second compartment 8 through the orifice 9 being in the gaseous state.
  • the compression device of the invention further comprises at least one holding member 10 of the means 11 for detecting a fluid flow 20 at the orifice 9.
  • the holding piece 10 comprises an axial through-hole recess 15 of axis A in which the means 11 for detecting a fluid flow 20 are arranged, the holding part 10 being positioned against the peripheral wall 1 of the second compartment 8 in such a way that the axis A of the axial recess 15 is substantially aligned with the center of the exhaust port 9.
  • the holding piece 10 may for example be fixed on the outer surface of the peripheral wall 1 by means of at least one screw 14.
  • the axial recess 15 constitutes a fluid conduit extending the orifice 9 to channel a flow of fluid escaping from the second compartment 8 through the orifice 9, and thus improve the sensitivity of the detection means 11.
  • the detection means 11 arranged in the axial recess 15 do not hermetically seal said axial recess 15 and allow the passage of a flow of fluid towards the outside of the second compartment 8. In this way, it there is no risk of overpressure in the second compartment 8 during the passage of a flow of fluid 20 from the first compartment 7 to the second compartment 8.
  • the device of the invention can be used in any type of industrial installation, as long as it comprises at least one fluid compression device, for example an ultra high pressure water jet (UHP) working installation. .
  • UHP ultra high pressure water jet
  • the invention is particularly advantageous in the context of a compression device adapted to and designed to serve as a compression device in a working installation by jets of cryogenic fluid.
  • the device of the invention makes it possible to greatly limit the aforementioned problems and in particular those related to the cryogenic temperatures and to the high fluid pressures prevailing in the first compartment 7.
  • the device of the invention offers the advantage of being adapted to and designed to trigger the stopping of the movement of the piston and / or the supply of fluid of the compression compartment almost instantaneously after the detection of a sealing defect of the sealing means 4, and much faster than with the delay time of the order of 10 seconds used in the prior art.
  • the presence of an operator near the controls of the compression device is no longer essential, which is a considerable advantage to limit production costs.
  • the device of the invention is also particularly advantageous when the presence of an operator near the work facility is to be avoided, as is the case for certain applications of the nuclear or chemical industries.
  • the invention also relates to a working installation employing at least one cryogenic fluid jet 20 at high pressure, preferably the fluid 20 is nitrogen.
  • FIG. 4 schematizes the architecture of a working installation for implementing a pickling, surface treatment or the like process by jets of cryogenic liquid, in particular of liquid nitrogen, in particular a jet working method. 'liquid nitrogen.
  • the supply means 41 typically comprise a fluid reservoir 20, preferably a high capacity storage tank, such as a truck tank or a tank. storage of several thousand liters.
  • the fluid 20, preferably nitrogen, is stored in the liquid state at cryogenic temperature.
  • the fluid conveying 20 between the various elements of the installation is done via fluid supply ducts, or pipes, preferably insulated.
  • the start and / or stop of the supply means 41 are controlled by a first command.
  • the supply means 41 feed fluid 20 to a compression unit 42 by at least one conduit 45 for supplying fluid.
  • the compression unit 42 comprises at least two compression stages as well as an internal heat exchanger 43.
  • the compression unit 42 comprises a first compression device which is fed by the fluid circulating in the conduit 45 at low pressure, that is to say at a pressure of approximately 3 to 6 bar, and at a pressure of temperature of about -180 ° C.
  • This first compression device allows a first pressure of the fluid 20, typically greater than 200 bar and preferably up to 1000 bar.
  • the cryogenic temperature fluid at the first pressure is conveyed to a second compression device in which it is compressed again at a second pressure typically up to 4000 bar.
  • the fluid 20 compressed at the second pressure is then conveyed via a conveyor line 46 to the external heat exchanger 43 where it undergoes cooling with liquid nitrogen at atmospheric pressure (at 48).
  • UHP fluid at a pressure typically greater than 300 bar and generally up to 5000 bar, preferably up to 4000 bar, and at a cryogenic temperature between -100 and -200 ° C, typically lower at -140 ° C., typically between -140 ° C. and -160 ° C., which is sent via a feed line 47 to a pickling tool or nozzle 44 or the like delivering one or more UHP fluid jets. in general several jets, preferably jets of liquid nitrogen.
  • the second compression device is a piston compression device as schematized on the Figures 3a and 3b comprising a first and a second compartment 7, 8 and a piston 5 mu by a hydraulic piston 5a.
  • the first compartment 7, which is the one in which the compression takes place at the second pressure, is supplied by the fluid 20 at cryogenic temperature and at the first pressure.
  • the installation of the invention comprises a second control which controls the setting in motion and the stopping of the piston 5 in at least a part of the first and second compartments 7, 8.
  • the second compression device comprises means 11 for detecting a flow of fluid 20 electrically connected to the first and the second control and allowing, in the event of the escape of a fluid flow 20 of the second compartment 8 to the second compartment 8 of the compression device 43, to trigger the stop of the translational movement of the piston 5 and the stoppage of the fluid supply 20.
  • the means 11 for detecting a flow of fluid 20 can also be electrically connected to an emergency stop command of the installation to cut off the general power supply of the installation, which has the effect of stopping in particular the translational movement of the piston 5 and the power supply. in fluid 20.
  • the main application of the present invention is a working method implementing a working installation according to the invention by means of one or more jets of fluid at cryogenic temperature under high pressure, preferably one or more jets of liquid nitrogen, for performing a surface treatment, stripping, cleaning, scraping or cutting of a material by means of an installation according to the invention.
EP13162045.2A 2012-05-10 2013-04-03 kompressionvorrichtung für Kryogenflüssigstrahlanlage Active EP2662565B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1254262A FR2990478B1 (fr) 2012-05-10 2012-05-10 Dispositif de compression pour installation de travail par jets de fluide cryogenique

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EP2662565A1 true EP2662565A1 (de) 2013-11-13
EP2662565B1 EP2662565B1 (de) 2021-06-09

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3109470A1 (de) * 2015-06-26 2016-12-28 Danfoss A/S Hydraulische maschinenanordnung
US10352322B2 (en) 2015-06-26 2019-07-16 Danfoss A/S Vane cell machine with centric bore in ring insert in side wall
US10711780B2 (en) 2015-06-26 2020-07-14 Danfoss A/S Hydraulic machine

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WO2004022974A1 (en) * 2002-09-05 2004-03-18 Donaldson Company, Inc. Seal-leak detector arrangement for compressors and other equipment
US20120097026A1 (en) 2004-08-18 2012-04-26 Waters Technologies Corporation Piston Pump With Leak Diagnostic Port
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US7316363B2 (en) 2004-09-03 2008-01-08 Nitrocision Llc System and method for delivering cryogenic fluid
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EP3109470A1 (de) * 2015-06-26 2016-12-28 Danfoss A/S Hydraulische maschinenanordnung
CN106286288A (zh) * 2015-06-26 2017-01-04 丹佛斯有限公司 液压机械装置
US10288051B2 (en) 2015-06-26 2019-05-14 Danfoss A/S Hydraulic machine arrangement
US10352322B2 (en) 2015-06-26 2019-07-16 Danfoss A/S Vane cell machine with centric bore in ring insert in side wall
US10711780B2 (en) 2015-06-26 2020-07-14 Danfoss A/S Hydraulic machine

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EP2662565B1 (de) 2021-06-09
FR2990478B1 (fr) 2017-10-20

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