IL123808A - Energy-generation process and power station for carrying out the process - Google Patents

Energy-generation process and power station for carrying out the process

Info

Publication number
IL123808A
IL123808A IL12380896A IL12380896A IL123808A IL 123808 A IL123808 A IL 123808A IL 12380896 A IL12380896 A IL 12380896A IL 12380896 A IL12380896 A IL 12380896A IL 123808 A IL123808 A IL 123808A
Authority
IL
Israel
Prior art keywords
steam
power plant
water
separator
circuit
Prior art date
Application number
IL12380896A
Other versions
IL123808A0 (en
Original Assignee
Deutsch Zentr Luft & Raumfahrt
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 Deutsch Zentr Luft & Raumfahrt filed Critical Deutsch Zentr Luft & Raumfahrt
Publication of IL123808A0 publication Critical patent/IL123808A0/en
Publication of IL123808A publication Critical patent/IL123808A/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/064—Devices for producing mechanical power from solar energy with solar energy concentrating means having a gas turbine cycle, i.e. compressor and gas turbine combination
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Photovoltaic Devices (AREA)

Abstract

Method for generating energy, in which steam generated in a solar power plant (30) is fed into a water/steam circuit (8) of a fossil-fuelled power plant, characterized in that the steam produced in the solar power plant (30) is fed through a water / steam separator (22) into the water/steam circuit as wet steam. 2184 כ" ה באלול התשס" א - September 13, 2001

Description

T'iwinii jm a ma sunav AWUM rnW? Energy-generation process and power station for carrying out the process Deutsches Zentrum fur Luft- und Raumfahrt e.V.
C. 110407 GR 95 P 3765 P - 1 - Description Method for generating energy and power plant installation for carrying out the method The invention relates to a method for generating energy and to a power plant installation for carrying out the method.
It is known that, in solar power plants, the solar radiation incident on the surface of the earth is used as a heat source for downstream energy conversion. Examples of solar thermal power plants are parabolic-array, tower and dish power plants.
In solar thermal power plants, the thermal medium is fed to a receiver in a primary collector circuit with specially configured solar-radiation receivers. The solar radiation is collected and concentrated onto the receiver using mirrors, or heliostats, mounted at the surface of the earth. The receiver is, for example, arranged in the tower of a tower power plant or in a dish power plant. The thermal medium is then heated in the receiver. If the thermal medium, for example, water is vaporized directly in the receiver, then this is referred to as direct vaporization. With indirect vaporization, the heat from the thermal medium is transported into a device downstream of the receiver, and vaporized there. The solar steam obtained, that is to say the product of the vaporization because of the effect of the solar radiation, is either solar superheated steam or wet steam. Wet steam consists of the two components water and steam.
In a steam power plant, water is vaporized in a steam generator by supplying hot water. On expansion in a steam turbine, the steam generates the energy for driving an electricity generator. The steam leaving the steam turbine GR 95 P 3765 P - 2 -is liquefied in a condenser at a pressure which is considerably below atmospheric pressure, and is fed back to the steam generator by a feed-water pump. Gas-turbine/steam-turbine power plants, also referred to as combined gas and steam power plants, allow efficiency to be improved considerably. In these power plants, the hot exhaust gases from a gas turbine are fed to the steam generator. Combined gas and steam power plants are known, for example, from the article "Dam fturbinen fur GuD-Kraftwerke" [Steam turbines for combined gas and steam power plants] by Wilhelm Engelke, Brennstoff-Warme-Kraft 41(1989), pages 335 to 342.
The coupling of the primary collector circuit of a solar power plant to the conventional water/steam circuit of the fossil-fuelled power plant is known, for example, from the publication "Solare Farmkraftwerke und Direcktverdampfung in Parabolrinnenkollektoren" [Agricultural solar power plants and direct vaporization in parabolic-array collectors] by M. Miiller and K. Hennecke, Forschungsverbund Sonnenenergie: "Themen 93/94", pages 57 to 63. However, only the feeding of solar superheated steam from a solar power plant into a fossil-fuelled power plant is known from the prior art.
In this case, however, the use of solar super-heated steam proves expensive. On the one hand, it requires considerable outlay in the production of the solar superheated steam in the solar power plant. Production requires an elaborately controlled water supply for the receiver, which is associated with considerable expense. On the other hand, solar superheated steam leads to high temperatures in the receiver, which shorten the life of the receiver components. Employing solar superheated steam in the fossil-fuelled power plant requires the installation of additional devices. This results in considerable extra costs.
The object of the invention is therefore to provide a method for producing energy, in which the primary collector circuit of a solar power plant is coupled to the water/steam circuit of the fossil-fuelled power GR 95 P 3765 P - 3 -plant, with the intention being to make substantial use of the components of the water/steam circuit when integrating the primary collector circuit into the water/steam circuit, and with additional costs being saved. A further intention is to provide a power plant system for carrying out this method.
The first object is achieved according to the invention by a method for generating energy, in which wet steam generated in a solar power plant is fed into a water/steam circuit of a fossil-fuelled power plant.
The second object is achieved according to the invention by a power plant installation for generating energy, in which a solar power plant is provided for feeding wet steam into a water/steam circuit of a fossil-fuelled power plant.
When the primary collector circuit of the solar power plant is integrated into the water/steam circuit of the fossil- fuelled power plant, substantial use is made of the components of the water/steam circuit, and addi-tional costs for further components are thereby saved. Simple control technology and low outlay on equipment are associated with the generation of wet steam in the solar power plant, and at the same time, the wet-steam throughput obtained is higher than with the production of solar superheated steam. Furthermore, the life of the receiver components can be extended by using wet steam. High availability of the power plant installation comprising a solar power plant and a fossil-fuelled power plant can thereby be ensured.
Preferably, the wet steam is fed into a water/steam separator vessel of a recuperation steam generator of a combined gas and steam power plant.
GR 95 P 3765 P - 4 - In particular, the wet steam is fed into a first overflow line of a steam power plant, the first overflow being arranged between a high-pressure turbine and a medium-pressure turbine.
In a further refinement, the wet steam flows through a water/steam separator vessel before it is fed into the first overflow line.
Preferably, the wet steam is fed into a separation tank of a once-through boiler. A Benson tank or a Benson boiler may, for example, be used as the separation tank and the once-through boiler.
In particular, the wet steam is fed into the once-through boiler between a vaporizer and a separator.
In a further refinement, the wet steam is fed into a drum of a circulation boiler.
Further advantageous refinements are described in the subclaims.
For further explanation of the invention, reference will be made to the illustrative embodiments in the drawing, in which: FIG 1 shows a circuit diagram of a combined gas and steam power plant; FIG 2 shows a circuit diagram of a steam power plant; FIG 3 shows a circuit diagram for a once-through boiler; and FIG 4 shows a circuit diagram for a circulation boiler.
According to FIG 1, a combined gas and steam power plant 2 comprises a recuperation steam generator 4. The hot exhaust gas from a gas turbine 6 flows through the latter, which is used for steam generation, its heating surfaces being connected into a water/steam circuit 8 of a steam turbine 10.
GR 95 P 3765 P - 5 - The steam leaving the gas turbine 10 is liquefied in a condenser 12 at a pressure which is substantially below atmospheric pressure, and is fed to the recuperation steam generator 4 by a first feed-water pump 14. The recuperation steam generator 4 comprises a preheater 16, a vaporizer 18 and a superheater 20. The water first flows through the preheater 16 and enters a water/steam separator vessel 22. The steam from the water/steam separator vessel 22 is fed back into the steam turbine 10 via the superheater 20. This closes the water/steam circuit 8.
The water is fed to the water/steam separator vessel 22 along two paths. On the one hand, the water is partly drawn from the water/steam separator vessel 22 and fed to the vaporizer 18 via a further feed-water pump 15. The water is vaporized in the vaporizer 18 and then fed back to the water/steam separator vessel 22.
On the other hand, wet steam produced in a solar power plant 30 is likewise fed to the water/steam separa-tor vessel 22 via a line 32. For a predetermined size of the solar power plant 30, a substantially greater volume flow is generated when generating wet steam than when solar superheated steam is used instead of wet steam. For this reason, a substantially larger proportion of steam can be fed from the solar power plant 30 to the water/steam separator vessel 22 when wet steam is used. A separate device is not required for feeding the wet steam to the water/steam separator vessel 22. Instead, the wet steam is fed directly into the latter.
The second feed-water pump 15 of the vaporizer circuit 24 can be left out if the vaporizer circuit 24 is designed accordingly.
A combustion chamber 36 and a compressor 33 are connected upstream of the gas turbine 6 in a line 34 defining a fossil-fuelled power plant 44. The gas turbine 6 and the steam turbine 10 generate the energy for the electrical generators 40 and 42, respectively.
In the embodiment of Fig. 1 which is not represented in further detail, the steam turbine 10 comprises a high-pressure turbine and a low-pressure turbine, or a high-pressure turbine, a medium-pressure turbine and a low-pressure turbine. The wet steam generated by the solar power plant 30 is then introduced into one of the water-steam separator vessels which are assigned to the corresponding turbine parts, such as the high-pressure turbine, the medium-pressure turbine or the low-pressure turbine.
According to FIG 2, the water/steam circuit 8a of a steam power plant 50 comprises/ in sequence, a high-pressure turbine 52, a medium-pressure turbine 54 and a low-pressure turbine 56. A first overflow line 53, with an intermediate superheater 60 arranged in it, is arranged in parallel with the water/steam circuit 8a, between the high-pressure turbine 52 and the medium-pressure turbine 54. A second overflow line 62 is arranged in parallel with the water/steam circuit 8a, between the medium-pressure turbine 54 and the low-pressure turbine 56.
A line 64 branches off from the water/steam circuit 8 between the preheater 16 and the vaporizer 18. This line is used for drawing off part of the water in the water/steam circuit 8a and feeding it to the solar power plant 30 via a line 70. A water/steam separator vessel 66 is arranged between the two lines 64 and 70. The solar power plant 30 feeds the wet steam directly into the water/steam separator vessel 66 via a line 68. The water separated from the wet steam is fed back into the solar power plant 30 via the line 70, while the steam which is separated is fed into the first overflow line 58 between the high-pressure turbine 52 and the intermediate superheater 60, via a line 69.
GR S5 ? 37S5 P - 7 - In a simplified embodiment, the water/steam separator vessel 66 is left out. As a result, the solar power plant 30 is supplied directly with heated water from the water/steam circuit Λ8a' and for its part feeds wet steam into the first overflow line 58.
The recuperation steam generator 4a receives its heat, for example, by external;;fossil firing.
In FIG 3, a water/steam separator 82 is arranged, between the vaporizer 18 and the superheater 20, in the water/steam circuit 8b of the once-through boiler 80.
Steam is fed from a separation tank 84, via a line 86, into the water/steam circuit 8b, between the water/steam separator 82 and the superheater 20. A part of the water from the separation tank 84 is fed, via a line 88, into the water/steam circuit 8b, between the condenser 12 and the feed-water pump 14. A part of the water is fed from the water/steam separator 82 to the separation tank 84, via a line 90.
The wet steam from the solar power plant 30 is either fed via the line 96 directly into the separation tank 84, via a line 92, or fed, via a line 94, to the water/steam circuit 8b, between the vaporizer 18 and the water/steam separator 82, as a result of which the wet steam is fed directly into the water/steam separator 82. As represented in FIG. 2, the water for operating the solar power plan 30 is drawn from the water/steam circuit 8b, between the preheater 16 and the vaporizer 18.
According to FIG 4, a circulation boiler 100 comprises a drum 102, which is arranged in the water/stream circuit 8ο", between the preheater 16 and the superheater 20. A part of the water is fed from the drum 102, via a down-pipe 104, to at least one GR 95 F 37S5 ? - 8 -vaporizer tube 105. The vaporized water leaves the vaporizer tube 106 to reenter the drum 102 directly. The steam is then fed, in the water/steam circuit 8c, to the superheater 20. By virtue of the fact that the vaporizer tube 106 is used, the vaporizer 18 is left out of this embodiment. The wet steam from the solar power plant 30 is fed into the drum 102 by a line 108.
In order to ensure a particular mass flow in the vaporizer tube 106, a circulation pump 110 is arranged in the down-pipe 104.

Claims (12)

123808/3 GR 95 P 3765 P - 9 - Patent Claims
1. Method for generating energy, in which steam generated in a solar power plant (30) is fed into a water/steam circuit (8) of a fossil-fuelled power plant, characterized in that . the steam produced in the solar power plant (30) is fed through a separator into the water/ steam circuit as wet steam.
2. Method according to Claim 1, in which said separator is a water/steam separator vessel (22) of a recuperation steam generator (4) of a combined gas and steam power plant (2) .
3. Method according to Claim 1 , in which said separator is a water/steam separator vessel (66) feeding the wet steam to a first overflow line (58) of a steam power plant (50) .
4. Method according to Claim 1 , in which said separator is a separation tank (84) of a once-through boiler (80) .
5. Method according to Claim 4 , in which the wet steam is fed into the water/steam circuit (8) between a vaporizer (18) and another water/steam separator (82) .
6. Method according to Claim 1 in which said separator is a drum (102) of a circulation boiler (100) .
7. Power plant installation for generating energy, in which a solar power plant (30) is provided for feeding wet steam through a separator into a water/steam circuit (8) of a fossil-fuelled power plant.
8. Power plant installation according to Claim 7 , in which said separator is a water/steam separator vessel (22) of a recuperation steam generator (6) of a combined gas and steam power plant (2) . 123808/2 GR 95 P 3765 P
9. Power plant installation according to Claim 7, in which said separator feeds the wet steam to an overflow line (58) of a steam power plant (50) , the overflow line (58) being arranged between a high-pressure turbine (52) and a medium-pressure turbine (54) .
10. Power plant installation according to Claim 7, in which said separator is a separation tank (84) of a once-through boiler (80) .
11. Power plant installation according to Claim 10, in which a line (94) feeds the wet steam into the water/steam circuit (8) between a vaporizer (18) and another water/steam separator (82) .
12. Power plant installation according to Claim 7 , in which said separation device is a drum (102) of a circulation boiler (100) . For the Applicants, REINHOLD COHN AND PARTNERS
IL12380896A 1995-10-17 1996-10-01 Energy-generation process and power station for carrying out the process IL123808A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19538670A DE19538670A1 (en) 1995-10-17 1995-10-17 Process for generating energy and power plant for carrying out the process
PCT/DE1996/001885 WO1997014887A1 (en) 1995-10-17 1996-10-01 Energy-generation process and power station for carrying out the process

Publications (2)

Publication Number Publication Date
IL123808A0 IL123808A0 (en) 1998-10-30
IL123808A true IL123808A (en) 2001-09-13

Family

ID=7775094

Family Applications (1)

Application Number Title Priority Date Filing Date
IL12380896A IL123808A (en) 1995-10-17 1996-10-01 Energy-generation process and power station for carrying out the process

Country Status (10)

Country Link
EP (1) EP0856104B1 (en)
CN (1) CN1196774A (en)
DE (2) DE19538670A1 (en)
EG (1) EG20701A (en)
ES (1) ES2154837T3 (en)
GR (1) GR3035330T3 (en)
IL (1) IL123808A (en)
MA (1) MA23987A1 (en)
PT (1) PT856104E (en)
WO (1) WO1997014887A1 (en)

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Publication number Priority date Publication date Assignee Title
DE19723543C2 (en) * 1997-06-05 2003-04-17 Deutsch Zentr Luft & Raumfahrt Power generation plant
US8378280B2 (en) 2007-06-06 2013-02-19 Areva Solar, Inc. Integrated solar energy receiver-storage unit
KR20100032408A (en) 2007-06-06 2010-03-25 오스라, 인크. Combined cycle power plant
US20090056703A1 (en) 2007-08-27 2009-03-05 Ausra, Inc. Linear fresnel solar arrays and components therefor
US9022020B2 (en) 2007-08-27 2015-05-05 Areva Solar, Inc. Linear Fresnel solar arrays and drives therefor
CN101586879B (en) * 2008-10-08 2011-04-20 中国华电工程(集团)有限公司 Solar thermal utilization system combined with gas-steam combined cycle
EP2199547A1 (en) * 2008-12-19 2010-06-23 Siemens Aktiengesellschaft Heat steam producer and method for improved operation of same
DE102009010020B4 (en) * 2009-02-21 2016-07-07 Flagsol Gmbh Feedwater degasser of a solar thermal power plant
DE102009056707A1 (en) 2009-04-18 2010-10-21 Alstom Technology Ltd. Steam power plant with solar collectors
DE102011077688A1 (en) * 2011-06-17 2012-12-20 Siemens Aktiengesellschaft Solar thermal power plant with fully integrated gas turbine and heat recovery steam generator
EP2610489A1 (en) 2011-12-30 2013-07-03 Alstom Technology Ltd Steam power plant with integrated solar receiver
DE102012006729A1 (en) 2012-04-02 2013-10-02 Hans-Malte Rombrecht Solar thermal power plant for converting solar energy into electrical energy, has multiple devices for conversion of solar radiation into heat, which are optimally adapted to respective temperature of energy-absorbing mediums
EP2667028A1 (en) * 2012-05-25 2013-11-27 Alstom Technology Ltd A steam Rankine cycle solar plant and method for operating such plants
CN105507971B (en) * 2016-02-05 2017-04-19 江苏朗禾农光聚合科技有限公司 Solar thermal dynamic energy storage system

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DE4126036A1 (en) * 1991-08-06 1993-02-11 Siemens Ag Gas and steam turbine plant with solar heated system generator - with generator connected to heat exchanger in h.p. steam line from waste heat steam generator
DE4126037A1 (en) * 1991-08-06 1993-02-11 Siemens Ag GAS AND STEAM TURBINE POWER PLANT WITH A SOLAR HEATED STEAM GENERATOR
DE4126038A1 (en) * 1991-08-06 1993-02-11 Siemens Ag Gas and steam turbine plant with solar heated steam generator - has additional combustion chamber in exhaust gas line from gas turbine
ES2116136B1 (en) * 1993-05-03 1998-12-16 Rosado Serafin Luis Mendoza COMBINATION IMPROVEMENT PROCEDURE BETWEEN A GAS TURBINE AND A VAPOR CYCLE WITH ANOTHER NON-FOSSIL SOURCE OF PRIMARY ENERGY.
DE4331784C2 (en) * 1993-09-18 1997-10-23 Deutsche Forsch Luft Raumfahrt Channel collector
WO1995011371A1 (en) * 1993-10-21 1995-04-27 Compañia Sevillana De Electricidad, S.A. Method for improving electric plants of combined cycle with solar support
DE4409197A1 (en) * 1994-03-17 1995-09-21 Siemens Ag Method and device for solar steam generation
US5444972A (en) * 1994-04-12 1995-08-29 Rockwell International Corporation Solar-gas combined cycle electrical generating system
WO1996031697A1 (en) * 1995-04-03 1996-10-10 Compañia Sevillana De Electricidad, S.A. System for the integration of solar energy in a conventional thermal power plant generating electric energy

Also Published As

Publication number Publication date
EP0856104A1 (en) 1998-08-05
CN1196774A (en) 1998-10-21
WO1997014887A1 (en) 1997-04-24
PT856104E (en) 2001-04-30
EG20701A (en) 1999-11-30
MA23987A1 (en) 1997-07-01
ES2154837T3 (en) 2001-04-16
DE59606281D1 (en) 2001-02-08
DE19538670A1 (en) 1997-04-24
IL123808A0 (en) 1998-10-30
EP0856104B1 (en) 2001-01-03
GR3035330T3 (en) 2001-04-30

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