EP1577561A1 - Device for circulating and heating sealing gas in a centrifugal compressor - Google Patents

Device for circulating and heating sealing gas in a centrifugal compressor Download PDF

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Publication number
EP1577561A1
EP1577561A1 EP20040405170 EP04405170A EP1577561A1 EP 1577561 A1 EP1577561 A1 EP 1577561A1 EP 20040405170 EP20040405170 EP 20040405170 EP 04405170 A EP04405170 A EP 04405170A EP 1577561 A1 EP1577561 A1 EP 1577561A1
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EP
European Patent Office
Prior art keywords
gas
compressor
sealing
process gas
device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20040405170
Other languages
German (de)
French (fr)
Inventor
Hermann Müller
Ariel Nic Weber
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.)
MAN Turbo AG Schwiez
Original Assignee
MAN Turbo AG Schwiez
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.)
Filing date
Publication date
Application filed by MAN Turbo AG Schwiez filed Critical MAN Turbo AG Schwiez
Priority to EP20040405170 priority Critical patent/EP1577561A1/en
Publication of EP1577561A1 publication Critical patent/EP1577561A1/en
Application status is Withdrawn legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/10Shaft sealings
    • F04D29/102Shaft sealings especially adapted for elastic fluid pumps
    • F04D29/104Shaft sealings especially adapted for elastic fluid pumps the sealing fluid being other than the working fluid or being the working fluid treated
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/10Shaft sealings
    • F04D29/12Shaft sealings using sealing-rings
    • F04D29/122Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
    • F04D29/124Shaft sealings using sealing-rings especially adapted for elastic fluid pumps with special means for adducting cooling or sealing fluid

Abstract

The circuit (1) for feeding gas into a compression chamber of a dry gas compressor (2a) has a passage (1a,b) defining a fluid path and a gas circuit including a compressor (1c) and a heater . A control (4) is provided for the compressor and heater. There is a filter (1i) in the fluid passage. The compressor can have a pneumatic drive.

Description

The invention relates to a circulating device for a Rotary compressor according to the preamble of claim 1. The The invention further relates to a rotary compressor according to the The preamble of claim 5. The invention further relates to Method for operating a rotary compressor according to The preamble of claim 9.

They are rotary compressors, such as turbo-compressors, Gas turbines, steam turbines or gas compressors for Compressing gases, especially hydrocarbons such as Natural gas known, which is the seal of the between the Housing and the rotatable shaft resulting gap Use non-contact dry gas seals.

These seals are arranged along the rotatable shaft, and disconnect the inside of the machine housing, under Pressurized process gas chamber from ambient pressure. The Sealing arrangement is typically in one of the Process gas chamber arranged separate sealing chamber, and preferably designed as a labyrinth seal. A sealing gas the seal chamber is fed to the seal provide required gas. As sealing gas is, for example a gas from an external source, such as nitrogen, or also the process gas suitable, which from the rotary compressor is compressed. There are corresponding feeders and Passages provided to the sealing gas over a Supply gas supply system to the seal chamber.

A disadvantage of such non-contact dry gas seals the fact that they are often damaged.

It is therefore an object of the present invention an arrangement and propose a procedure that will allow it Rotary compressors more advantageous, cheaper and safer to operate.

This object is achieved with a circulating device comprising the features of claim 1. The dependent claims 2 to 5 relate further advantageous embodiments. The task will be solved further with a compressor having the features of claim 6 Subclaims 7 to 8 concerning further, advantageously designed Compressors. The problem is further solved by a method having the features of claim 9. The subclaims 10 to 13 relate to further advantageous method steps.

The object is achieved in particular with a circulating device for conveying sealing gas into the sealing chamber of Dry gas seals of a rotary compressor, comprising a Line which forms a fluid path to the device with to connect a sealing gas cycle, comprising a Seal gas compressor and a heater which fluid conducting connected to the line, as well as comprising a Control device which the sealing gas compressor and the Heating device controls. As a sealing gas is preferably Process gas such as natural gas used.

An advantage of the inventive circulating device is in it too see that the seal gas so warms the seal chamber is supplied to the gas seal, due to the location of the Dew point, in the dry gas seal no liquids or Solids such as hydrates precipitates. The sealing gas is over the Dry gas seal partially relaxed, so that the Sealing gas, cooled due to the Joule-Thomson effect. The Inventive device or the inventive Procedure ensures that no liquids or solids in the dry gas seal are excreted. This is ensures that in the dry gas seal only gaseous Substances are what ensures safe and long - term operation of the Dry gas seal without damaging it guaranteed, too at longer standstill of the compressor.

As a sealing gas, the process gas is preferably used, wherein Also, another gas is usable for sealing.

The task is further particularly with a method for Turning off a rotary compressor having Dry gas seals solved by the dry gas seals at Standstill supplied with a heated sealing or process gas become.

This method is particularly advantageous when a Rotary compressor is turned off and stopped without the process gas is drained during standstill, so the pressure in the rotary compressor is substantially maintained. The pressure in the rotary compressor is depending on the application for example, between 10 and 500 bar. If a Rotary compressor is turned off and the process gas is not is discharged, so occurs in the rotary compressor pressure equalization the process gas, the pressure of this pressure equalization higher is the suction pressure of the compressor. After the stoppage of the Compressor, the process gas cools down over time Ambient temperature, wherein the pressure of the process gas in is maintained substantially. If the dew point of the process gas higher than the ambient temperature there is a risk that itself, in particular in the dry gas seal, liquid and maybe excrete even solids like hydrates. It exists the Danger that these excretions the dry gas seals damage, especially if the compressor is back in Operation is taken. The inventive method now has the advantage that the dry gas seals with so heated sealing or process gas are supplied, that the Elimination of liquid or solids is prevented.

In an advantageous embodiment, a phase diagram of the used process gas stored, and the process gas on Reason of the phase diagram and measured values like Temperature and / or pressure of the process gas heated so that no liquid or solid in the dry gas seal Excrete ingredients. The phase diagram is dependent on each used sealing or process gas. Depending on each by the compressor promoted process gas, such as the specific composition of the extracted natural gas, is a according to the composition adapted phase diagram used. In a preferred embodiment Hydrocarbons (CnHm), for example methane, ethane, Butane, ...... hectan, octane, wherein the inventive Device or the inventive method also for Promotion of other gases is suitable. The use of the Process gas hydrocarbons as sealing gas is therefore especially demanding, because this sealing gas already at temperatures precipitate liquids or solids between 20 and 50 ° C can.

An advantage of the method according to the invention can be seen in that a compressor can last longer, for example a few days, can stand still while essentially maintaining the Operating pressure without the risk that the Dry gas seals are damaged. The inventive Method thus allows a compressor safely and switch off economically and start again.

Another advantage is the fact that the compressor during a longer period of time at standstill be kept under pressure can. Therefore, it is no longer necessary the process gas during to let go of the standstill, which is especially then problematic when the process gas has environmentally harmful components such as for example Natural gas applies.

The invention will be described below with reference to an embodiment in detail. Show it:

FIG. 1
a schematic detail view of a compressor with a circulating device;
FIG. 2
a two-phase diagram of the process gas;
FIG. 3
a schematic view of another arrangement of the circulating device in a compressor.

Figure 1 shows a schematic of an embodiment of a Circulating device 1 which with a compressor 2 fluid conducting connected is. The circulating device 1 comprises two Process gas lines 1a, 1b, between which a gas compressor 1c, also called booster, a heater 1e and a Check valve 1 f is arranged to the sealing or process gas via the process gas line to suck 1a, with the gas compressor 1c and the heater to compress and heat, and the sealing gas then via the process gas line 1b to the compressor. 2 supply. In an advantageous embodiment of the causes Gas compressor 1c an increase in pressure of the sealing or process gas by 1 to 2 bar, to allow a circulation flow of the gas enable. The heater 1e may be in different ways be designed and, for example, within the Process gas line 1a, 1b may be arranged. The gas compressor 1 could also include a pressure vessel, which fluid is conductively connected to the process gas line 1a, 1b, and to Attenuation of generated by the compressor 1c Pulsationsschwingungen serves.

The gas compressor 1c is connected to a drive 1d. The Arrangement 1 c, 1 d can be configured as a piston compressor with two cylinders, with a cylinder as the drive element and the other cylinder serves as a compression element, wherein the Drive element supplied with compressed air for driving the cylinder becomes.

The circulating device 1 can be configured as a separate unit, for example, by putting all the necessary components in one rack be arranged to, for example, an existing compressor. 2 retrofit. However, the circulating device 1 can also be part of the Compressor 2 form.

The circulating device 1 can also comprise a filter 1 i, which is arranged in the fluid path to the gas of solids and / or to clean liquids. The circulating device 1 can also a temperature sensor 1h and / or a Include pressure sensor 1g. These components 1i, 1g, 1h can be found in the circulating device 1 itself be arranged, or as in Embodiment shown according to Figure 1, in components the compressor 2, in particular along the sealing gas circuit be arranged. The temperature sensor 1h is such in FIG arranged that this is the temperature of the sealing gas in the range the dry gas seal measures. The temperature sensor 1h could For example, on the process gas line 2m, 2n or 2o are arranged to at this point the temperature of the sealing gas to eat.

An electronic control device 4 is used to control the Umwälzvorrichtung 1, wherein this drive device 4 part of Circulating device 1 may form, or part of the compressor. 2 can form, or designed as a separate, additional component can be.

The electronic drive device 4 is connected via signal lines 4a connected to the respective controllable components 1d, 1e, 1g, 1h.

The rotary compressor 2 is known per se designed and includes a compressor housing 2a, as well as with a Help of bearings 2d rotatably mounted shaft 2c. Not shown Compressor wheels are firmly connected to the shaft 2c, and form in inside the compressor housing 2a together with others Components the compression chambers, which with the suction side 2e and the pressure side 2h are fluidly connected.

Along the shaft 2c gas seals 2b are arranged so that between forming sealing chambers. This gas seals 2b are as non-contact gas seals, preferably as Labyrinth seals designed. The one seal chambers are supplied with process gas via process gas lines 2n, 2o, whereas the other sealing chambers via feeds 3a, 3c are supplied with a sealing or buffer gas, for example with Nitrogen. This seal gas is, for example, a Derivative 3b to a torch or via a derivative 3d of the Atmosphere fed.

The compressor 2 comprises a first sealing or Process gas cycle (21, 2m, 2n, 2o) along which the process gas during operation of the compressor 2 circulates. The process gas is the compressor housing 2a by means of the process gas line 21st at a pressure slightly above the suction pressure, then fed to a filter 2k, which solid or liquid components holds back, and then on the process gas lines 2m, 2n, 2o the fed shown sealing chamber. The inventive Circulating device 1 forms a second sealing gas cycle by the process gas with the aid of the process gas line 1a suction side 2e is removed and fed to the compressor 1c. The Process gas line 1b opens into the filter 2k. There are two Check valves 1f, 2p arranged, which act so passive, that depending on the particular pressure conditions either a first sealing gas circuit 21, 2m, 2n, 2o or a second Sealing gas circuit 1a, 1b, 2m, 2n, 2o forms.

During normal operation of the compressor 2 is the first Sealing gas circuit open and the second sealing gas circuit closed so that the sealing space and the Dry gas seals 2b via the lines 2n, 2o constantly with gas be supplied.

When switching off or when the rotary compressor 2 the compressor 1c is turned on, with the result that the Check valves 1f, 2p are moved automatically such that the second sealing gas cycle is opened and the first Sealing gas circuit is closed. During the standstill, the Rotary compressor 2 preferably not ventilated, resulting in that has the pressure of the process gas inside the housing 2s, and the pressure significantly above the suction pressure lie comes. At a longer standstill of the rotary compressor 2 the process gas cools down, whereby the pressure of the process gas, on Reason for the good sealing effect of the dry gas seals, im substantially or only slightly decreases. In this Condition there is a risk that in very small proportions Dry gas seals pouring process gas liquids or even precipitates solids which are in the dry gas seals lead and this particular when starting the compressor. 2 damage or even destroy. To prevent this effect is at standstill of the compressor 2, the first sealing circuit closed, the second sealing gas cycle opened, and the Process gas in the compressor 1c slightly compressed and then warmed to the dry gas seals with sure with heated Supply process gas, thereby eliminating Liquids or solids in the dry gas seal too prevention.

In place of process gas could also be another available Seal gas can be used, which heats and circulates is added to the dry gas seals before precipitation protect. For this purpose, in the one shown in FIG Embodiment, the lines 2n, 2o with the line 3a and / or 3c, and the line 1a with the line 3b or 3d.

In a further advantageous method, the pressure and / or the temperature of the sealing or process gas with accordingly arranged sensors 1h, 1g are measured, and the sealing or process gas as a function of the measured temperature and / or Pressure to be promoted or heated by the circulating device 1.

FIG. 2 shows a two-phase diagram 5 of a process gas in FIG Function of temperature T and pressure P. The lines 5a, 5c form the Border between clearly gaseous or liquid state of Process gas. Within the line 5a is the Transitional phase, within which the process gas is gaseous, may have liquid or even solid components. The line 5b represents the line of solids formation or hydrate formation.

An essential aspect of the inventive method is to be seen in that the process or sealing gas is heated in such a way that this never within the state bounded by the line 5a within which are liquids or solids excrete.

In an advantageous method, for each specific process or sealing gas, the associated, individual two-phase diagram determined and in a memory 4b of the drive device. 4 stored.

Figure 2 shows by way of example the pressure and Temperature value of the process gas within the compressor 2 to at a certain time during standstill. By the continuous cooling of the process gas moves the point 6, at about constant pressure, along the line 6a to Two-phase diagram 5 out. With the help of in the drive device 4 stored two-phase diagram 5 and with the help of The temperature of the process gas measured by the sensor 1h may be Process gas so promoted and heated by the heater 1 e be that point 6, especially in the field of Dry gas seal, outside the line 5a remains, so it is ensured that in the dry gas seals no Liquid or solid failure occurs.

The compressor shown in Figure 1 only sets Exemplary embodiment. The circulating device according to the invention 1 or the inventive method can with a Variety of different compressors such as turbo compressors, Gas turbines, steam turbines or gas compressors as well used different process and / or sealing gases become.

FIG. 3 shows schematically a further arrangement of a Recirculation device 1 in conjunction with a compressor 2. The first sealing gas circuit comprises the process gas lines 21, 2m, 2n, 2o and the filter 2k. The second sealing gas cycle includes the Process gas lines 21, 1a, 1b, 2n, 2o. The process gas line 21 takes the process gas to the compressor 2a at a Intermediate. The circulating device 1 is as a bypass for Process gas line 2 m arranged, wherein in Figure 3, the required Valves for bypassing fluid flow either through the conduit 2m or the circulating device 1 with lines 1a, 1b not are shown. The circulating device 1 also includes the electronic drive device 4 and signal lines 4a, which are not shown. The process gas line 21 could be the Compressor 2a, the process gas also on the pressure side 2h remove.

Claims (14)

  1. Circulating device (1) for conveying sealing gas in the Sealing chamber of dry gas seals (2b) of a Rotary compressor (2a), comprising a conduit (1a, 1b) which forms a fluid path to the device (1) with to connect a sealing gas cycle, comprising a Compressor (1c) and a heater (1e) which fluid conductive with the line (1a, 1b) are connected, and comprising a drive device (4) which the compressor (1c) and the heating device (1e) controls.
  2. Circulating device (1) further comprising a filter (1i), which along the fluid path of the conduit (1a, 1b) is arranged.
  3. Circulating device (1) according to one of the preceding claims, characterized in that a temperature sensor (1h) is arranged such that it measures the temperature of the sealing gas in the sealing gas circuit, and that the driving device (4) is designed such that it the value of the temperature sensor (1h), and controls the heater (1e) in response to the measured value.
  4. Circulation device (1) according to claim 3, characterized in that the drive device (4) comprises a storage means (4b) for a phase diagram (5), and that the drive device (4) is designed such that the heating device (1e) in dependence on Phase diagram (5) and / or the measured value of the temperature sensor (1h) can be controlled.
  5. Circulating device (1) according to one of the preceding claims, characterized in that the compressor (1c) has a pneumatic drive.
  6. Compressor (2) comprising a circulating device (1) according to one of the preceding claims, wherein the line (1a, 1b) forms part of a sealing gas cycle.
  7. Compressor (2) according to claim 6, characterized in that the sealing gas circuit is designed such that this process gas passes.
  8. Compressor (2) according to claim 6 or 7, characterized in that the compressor (2) comprises a first sealing gas circuit (21, 2m, 2n, 2o) that the compressor (2) has a second sealing gas circuit (1a, 1b, 2n, 2o ), in which the circulating device (1) is arranged, and in that valves (1f, 2p) are arranged such that either the first sealing gas circuit or the second sealing gas circuit is continuously fluid-conducting.
  9. Method for switching off a rotary compressor (2) comprising dry gas seals (2b) by the Dry gas seals (2b) at standstill with a heated Are supplied gas.
  10. A method according to claim 9, characterized in that process gas is used as the sealing gas.
  11. Method according to one of claims 9 or 10, characterized in that the pressure of the process gas is not discharged during standstill, and that the rotary compressor (2a) is restarted after standstill.
  12. Method according to one of claims 9 to 11, characterized in that the pressure and / or the temperature of the sealing or process gas is measured and the sealing or process gas is heated in dependence on the measured temperature and / or pressure.
  13. Method according to one of claims 9 to 12, characterized in that a sealing or process gas corresponding phase diagram is stored, and that the sealing or process gas is heated so that in the dry gas seals (2b) no liquid or solid components excrete.
  14. Compressor or compression system operated with a Method according to one of claims 9 to 13.
EP20040405170 2004-03-19 2004-03-19 Device for circulating and heating sealing gas in a centrifugal compressor Withdrawn EP1577561A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20040405170 EP1577561A1 (en) 2004-03-19 2004-03-19 Device for circulating and heating sealing gas in a centrifugal compressor

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP20040405170 EP1577561A1 (en) 2004-03-19 2004-03-19 Device for circulating and heating sealing gas in a centrifugal compressor
JP2007503288A JP2007529674A (en) 2004-03-19 2005-03-17 Circulation device for rotary compressor, rotary compressor, and operation method of rotary compressor
PCT/EP2005/002820 WO2005090793A1 (en) 2004-03-19 2005-03-17 Circulation device for a rotary compressor, rotary compressor, and method for operating the same
EP20050716134 EP1725776A1 (en) 2004-03-19 2005-03-17 Device for circulating and heating sealing gas in a centrifugal compressor
NO20064737A NO20064737L (en) 2004-03-19 2006-10-19 Circulation device for a rotary compressor, and process feed for the operation of a rotary compressor

Publications (1)

Publication Number Publication Date
EP1577561A1 true EP1577561A1 (en) 2005-09-21

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EP20040405170 Withdrawn EP1577561A1 (en) 2004-03-19 2004-03-19 Device for circulating and heating sealing gas in a centrifugal compressor
EP20050716134 Withdrawn EP1725776A1 (en) 2004-03-19 2005-03-17 Device for circulating and heating sealing gas in a centrifugal compressor

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EP20050716134 Withdrawn EP1725776A1 (en) 2004-03-19 2005-03-17 Device for circulating and heating sealing gas in a centrifugal compressor

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EP (2) EP1577561A1 (en)
JP (1) JP2007529674A (en)
NO (1) NO20064737L (en)
WO (1) WO2005090793A1 (en)

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WO2009064569A1 (en) 2007-11-12 2009-05-22 Exxonmobil Upstream Research Company Methods of generating and utilizing utility gas
EP2466144A1 (en) 2010-12-16 2012-06-20 FIMA Maschinenbau GmbH Device for compressing a process gas
US8921637B2 (en) 2010-11-15 2014-12-30 Exxonmobil Upstream Research Company Kinetic fractionators, and cycling processes for fractionation of gas mixtures
US9017457B2 (en) 2011-03-01 2015-04-28 Exxonmobil Upstream Research Company Apparatus and systems having a reciprocating valve head assembly and swing adsorption processes related thereto
US9034078B2 (en) 2012-09-05 2015-05-19 Exxonmobil Upstream Research Company Apparatus and systems having an adsorbent contactor and swing adsorption processes related thereto
US9034079B2 (en) 2011-03-01 2015-05-19 Exxonmobil Upstream Research Company Methods of removing contaminants from hydrocarbon stream by swing adsorption and related apparatus and systems
US9067168B2 (en) 2010-05-28 2015-06-30 Exxonmobil Upstream Research Company Integrated adsorber head and valve design and swing adsorption methods related thereto
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EP2231306A4 (en) * 2007-11-12 2011-06-22 Exxonmobil Upstream Res Co Methods of generating and utilizing utility gas
US8906138B2 (en) 2007-11-12 2014-12-09 Exxonmobil Upstream Research Company Methods of generating and utilizing utility gas
WO2009064569A1 (en) 2007-11-12 2009-05-22 Exxonmobil Upstream Research Company Methods of generating and utilizing utility gas
US9126138B2 (en) 2008-04-30 2015-09-08 Exxonmobil Upstream Research Company Method and apparatus for removal of oil from utility gas stream
US10035096B2 (en) 2008-04-30 2018-07-31 Exxonmobil Upstream Research Company Method and apparatus for removal of oil from utility gas stream
US9067168B2 (en) 2010-05-28 2015-06-30 Exxonmobil Upstream Research Company Integrated adsorber head and valve design and swing adsorption methods related thereto
US8921637B2 (en) 2010-11-15 2014-12-30 Exxonmobil Upstream Research Company Kinetic fractionators, and cycling processes for fractionation of gas mixtures
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US9120049B2 (en) 2011-03-01 2015-09-01 Exxonmobil Upstream Research Company Apparatus and systems having a rotary valve assembly and swing adsorption processes related thereto
US9034079B2 (en) 2011-03-01 2015-05-19 Exxonmobil Upstream Research Company Methods of removing contaminants from hydrocarbon stream by swing adsorption and related apparatus and systems
US9017457B2 (en) 2011-03-01 2015-04-28 Exxonmobil Upstream Research Company Apparatus and systems having a reciprocating valve head assembly and swing adsorption processes related thereto
US9162175B2 (en) 2011-03-01 2015-10-20 Exxonmobil Upstream Research Company Apparatus and systems having compact configuration multiple swing adsorption beds and methods related thereto
US9168485B2 (en) 2011-03-01 2015-10-27 Exxonmobil Upstream Research Company Methods of removing contaminants from a hydrocarbon stream by swing adsorption and related apparatus and systems
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JP2007529674A (en) 2007-10-25
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NO20064737L (en) 2006-10-19

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