EP0586425A1 - Energy generating process in a combined gas/steam generating power station - Google Patents
Energy generating process in a combined gas/steam generating power stationInfo
- Publication number
- EP0586425A1 EP0586425A1 EP92910154A EP92910154A EP0586425A1 EP 0586425 A1 EP0586425 A1 EP 0586425A1 EP 92910154 A EP92910154 A EP 92910154A EP 92910154 A EP92910154 A EP 92910154A EP 0586425 A1 EP0586425 A1 EP 0586425A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam
- steam generator
- heat
- gas
- gas turbine
- 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
Links
Classifications
-
- 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
Definitions
- the invention relates to a method for generating energy in a combined gas-steam power plant with a gas turbine and a preferably coal-fired steam generator.
- the compressed working gas occurring in the oil or gas-fired combustion chamber of the gas turbine is first relaxed in the gas turbine at a temperature of now more than 1000 ° C.
- the hot turbine exhaust gases are released fed into the combustion power zone of the steam generator, in which case the residual heat of the gas turbine exhaust gas in the steam generator is also used .. Because of the high temperature difference between the inlet of the gas turbine and the outlet of the steam turbine, such a combined process 3 has a relatively high efficiency.
- the healing turbine gases for which gas turbine inlet temperatures increase as gas turbine development progresses, have lower oxygen contents at higher temperatures.
- additional-fired steam generators which want to use both the gas turbine exhaust gas heat and the oxygen contained in the gas turbine exhaust gas for combustion in the auxiliary firing, the resultant oxygen concentration must be increased by additional fresh air in order to ensure complete combustion.
- the present invention is therefore based on the object of a method for generating energy in a combined. " To further develop gas-steam power plants of the type mentioned at the outset both in order to achieve higher efficiencies and to increase availability.
- This object is achieved in that the gas turbine is followed by a heat recovery steam generator system fed with water from the water-steam circuit of the gas-steam power plant, in that the temperature of the steam flow from the heat recovery steam generator system is supplied to the temperature of the steam flow from the by supplying additional heat Steam generator is adjusted and that both steam flows are then mixed and fed to the same steam turbine, the one hand for the Generation and temperature adjustment of the steam flow from the waste heat steam generator system and, on the other hand, the heat quantities required for the generation of the steam flow in the steam generator are each made available via heat generation and heat transfer systems that are independent of one another on the combustion side.
- the method according to the invention is characterized by a complete decoupling of the two energy generation circuits on the combustion side.
- the hot exhaust gas from the gas turbine is therefore not introduced into the steam generator, but is used to generate process steam in a separate heat recovery steam generator system.
- the steam generator itself and generally also the downstream units are not burdened with additional amounts of exhaust gas from the gas turbine process or any additional control that may be required to generate the additional heat required.
- the method according to the invention is therefore particularly suitable for retrofitting or expanding existing steam power plants, since no interventions in the combustion area of the steam generator or in the heat dissipation and gas cleaning systems integrated in the flue gas path are necessary.
- thermodynamic linkage of the two energy generation cycles takes place according to the inventive method exclusively via the water-steam cycle.
- the two high-pressure partial steam flows generated in the waste heat steam generator system and in the steam generator are ver after adjustment of their steam states, that is, essentially their temperatures mixes and then relaxed working in the same steam turbine.
- the additional heat required for the adjustment of the steam flows is also generated and transmitted without influencing the firing of the steam generator. H. it is Z. B. not provided, if the additional heat is generated in an additional firing, the hot flue gases of this additional firing in the firing performance zone of the steam generator.
- the invention provides for the hot flue gas stream from this firing to be mixed either with the exhaust gas from the gas turbine before it enters the heat recovery steam generator system or with the flue gas from the steam generator behind the firing power zone, in order to then also mix the residual heat either in the heat recovery steam generator system itself or also in the heat exchangers integrated in the flue gas path of the steam generator.
- admixing to the exhaust gas of the gas turbine is appropriate if the additional firing is operated with gas or oil as fuel, while admixing to the flue gas stream of the steam generator is more suitable in the case of an additional firing operated with solid fuels.
- the additional heat required can also be transferred by heat exchange with the hot flue gas generated in the steam generator.
- the complete independence of the systems can be achieved, for example, by regulating the steam temperature of the steam streams to be assigned to the heat recovery steam generator system (high-pressure steam, reheater steam).
- the power ratio between the waste heat steam generator plant and the steam generator in the gas-steam power plant operated according to the invention is expediently 1, preferably between 1: 1 and 1: 4.
- the required or desired power ratio of the heat recovery steam generator system to the steam generator can be set by the arrangement of a plurality of gas turbines, the respective heat recovery steam generator systems of which are connected in parallel with respect to the steam flow.
- the figure shows schematically a combined gas-steam power plant operating according to the method according to the invention.
- the expanded working steam in three turbine stages 9, 10 and 11, which are arranged on the same shaft with a generator 12, is condensed in a condenser 13 and as condensate by means of a pump via preheaters 15 and 16 connected in parallel into one Feed water tank 17 promoted.
- the water collected in the feed water tank 17 is pumped to process pressure in a high pressure pump 18 and then divided into two partial flows.
- One of the partial streams first passes through a line 19 to a heat exchanger 20 heated by extraction steam and is then fed to a coal-fired steam generator system 21, for example it can be the steam generator of an existing coal-fired power plant.
- the second partial flow of the pressurized feed water is fed to the heat recovery steam generator system 7 via a line 22 and is evaporated and heated in heating surfaces 23 in heat exchange with the hot exhaust gas from the gas turbine 4.
- the steam thus obtained, which has not yet been superheated, is fed via line 24 to a gas superheater 25 in this exemplary embodiment, where it is further heated to the temperature of the superheated steam generated in the steam generator 21 by supplying additional heat.
- Both partial streams from the auxiliary boiler 25 and the steam generator system 21, now adjusted in their steam states, are mixed together and fed to the first stage 9 of the three-stage steam turbine.
- the partially relaxed steam flow is reheated.
- the steam flow is divided into two partial flows.
- the intermediate superheating of the one partial flow takes place in heating surfaces 27 within the gas-heated final superheater 25, while the second partial flow is reheated in an intermediate superheater 28 integrated into the flue gas path of the steam generator.
- the partial steam flow in the heating surfaces 27 corresponds in quantity to the steam flow flowing out of the heat recovery steam generator system 7 via the line 24.
- the still hot flue gas obtained in the auxiliary boiler 25 is drawn off according to the invention via a line 26, mixed with the hot exhaust gas of the gas turbine 4 flowing in the line 6 and cooled together with this in the heat recovery steam generator 7 and then withdrawn from the system.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
Un procédé permet de générer de l'énergie dans une centrale thermique combinée à gaz et à vapeur ayant une turbine à gaz (4) et un générateur de vapeur (21) chauffé de préférence au charbon. La turbine à gaz (4) est située en aval d'une installation de génération de vapeur chauffée par chaleur perdue (7) et alimentée en eau par le circuit de vapeur d'eau de la centrale thermique à gaz et à vapeur. La température du courant de vapeur fourni par l'installation de génération de vapeur chauffée par chaleur perdue est amenée à la température du courant de vapeur fourni par le générateur de vapeur par apport de chaleur supplémentaire. Les deux courants de vapeur sont ensuite mélangés et amenés à la même turbine à vapeur (9). Les quantités de chaleur requises d'une part pour la production et la correction en température du courant de vapeur issu de l'installation de génération de vapeur chauffée par chaleur perdue (7) et d'autre part pour générer le courant de vapeur dans le générateur de vapeur (21) sont fournies par des systèmes de génération et de transmission de chaleur indépendants situés du côté de la chaufferie.A method makes it possible to generate energy in a combined gas and steam thermal power station having a gas turbine (4) and a steam generator (21) preferably coal-fired. The gas turbine (4) is located downstream of a steam generation installation heated by waste heat (7) and supplied with water by the steam circuit of the gas and steam thermal power station. The temperature of the steam stream supplied by the waste heat-heated steam generating installation is brought to the temperature of the steam stream supplied by the steam generator by supplying additional heat. The two steam streams are then mixed and fed to the same steam turbine (9). The quantities of heat required on the one hand for the production and the temperature correction of the stream of steam coming from the installation for generating steam heated by waste heat (7) and on the other hand for generating the stream of steam in the steam generator (21) are supplied by independent heat generation and transmission systems located on the side of the boiler room.
Description
Verfahren zur Erzeugung von Energie in einer kombinierten Gas-Dampfkraftanlage Process for generating energy in a combined gas-steam power plant
Die Erfindung betrifft ein Verfahren zur Erzeugung von Energie in einer kombinierten Gas-Dampfkraftanlage mit einer Gasturbine und einem vorzugsweise kohlegefeuerten Dampferzeuger.The invention relates to a method for generating energy in a combined gas-steam power plant with a gas turbine and a preferably coal-fired steam generator.
Bei einem bekannten Verfahren zur Erzeugung elektrischer Energie in einer kombinierten Gas-Dampfkraftanlage wird das in der öl- oder gasbefeuerten Brennkammer der Gasturbine anfallende ver¬ dichtete Arbeitsgas bei einer Temperatur von inzwischen über 1000" C zunächst in der Gasturbine arbeitsleistend entspannt. Die heißen Turbinenabgase werden in die Feuerungsleistungszone des Dampferzeugers eingespeist, wobei dann auch die Restwärme des Gasturbinenabgases im Dampferzeuger genutzt wird. Aufgrund der hohen Temperaturdifferenz zwischen dem Eingang der Gasturbine und dem Ausgang der Dampfturbine weist ein derartiger kombinierter Proze3 einen relativ hohen Wirkungsgrad auf.In a known method for generating electrical energy in a combined gas-steam power plant, the compressed working gas occurring in the oil or gas-fired combustion chamber of the gas turbine is first relaxed in the gas turbine at a temperature of now more than 1000 ° C. The hot turbine exhaust gases are released fed into the combustion power zone of the steam generator, in which case the residual heat of the gas turbine exhaust gas in the steam generator is also used .. Because of the high temperature difference between the inlet of the gas turbine and the outlet of the steam turbine, such a combined process 3 has a relatively high efficiency.
Die heilen Turbinengase, für die mit fortschreitender Gastur¬ binenentwicklung steigende Gasturbineneintrittstemperaturen angestrebt werden, weisen mit höheren Temperaturen geringere Sauerstoffgehalte auf. Dies führt in zusatzgefeuerten Dampf¬ erzeugern, die sowohl die Gasturbinenabgaswärme als auch den im Gasturbinenabgas enthaltenen Sauerstoff zur Verbrennung in der Zusatzfeuerung nutzen wollen, dazu, daß die hiermit gebotene Sauerstoffkonzentration durch weitere Frischluft erhöht werden muß, um eine vollständige Verbrennung zu gewährleisten.The healing turbine gases, for which gas turbine inlet temperatures increase as gas turbine development progresses, have lower oxygen contents at higher temperatures. In additional-fired steam generators which want to use both the gas turbine exhaust gas heat and the oxygen contained in the gas turbine exhaust gas for combustion in the auxiliary firing, the resultant oxygen concentration must be increased by additional fresh air in order to ensure complete combustion.
Dadurch erhöht sich bei gleicher Dampferzeugerleistung der Abgas- bzw. Rauchgasmassenstrom durch den Dampferzeuger und die
nachgeschalteten Komponenten, wie Elektrofilter, Saugzug, Entstickungsanlage und Rauchgasentschwefelungsanlage. Größeres Gasturbinenvolumen und zusätzliche Frischluft führten im Ver¬ gleich zu einer Verbrennung ausschließlich mit Frischluft wiederum zu einer Erhöhung des Energieeigenbedarfes der Kraft¬ werksanlage, so daß ein Teil der durch die Kombination von Gasturbine und Dampfturbine gewonnenen Wirkungsgradverbesserung wieder aufgezehrt wird.This increases the exhaust gas or flue gas mass flow through the steam generator and the same steam generator output downstream components such as electrostatic precipitator, suction, denoxification and flue gas desulphurization. Larger gas turbine volumes and additional fresh air, in comparison to combustion using only fresh air, in turn led to an increase in the energy requirements of the power plant, so that part of the efficiency improvement obtained by the combination of gas turbine and steam turbine is consumed again.
In Feuerungen ist eine Erhöhung des Rauchgasmassenstromes nur begrenzt möglich, so daß z. B. in Schmelzkammerfeuerungen, dere Schmelzfluß in der Brennkammer negativ beeinflußt oder in Feuerungen, deren arteigene Strömungsgeschwindigkeiten mit Ein¬ leitung der Gasturbinenabgase wesentlich überschritten werden. Eine Nachrüstung von Dampfkraftanlagen mit solchen Feuerungen auf kombinierte Gas-Dampfkraftanlagen der beschriebenen Art ist daher nur bedingt möglich.In furnaces an increase in the flue gas mass flow is possible only to a limited extent, so that, for. B. in smelting chamber furnaces, whose melt flow in the combustion chamber has a negative influence, or in furnaces whose specific flow velocities are substantially exceeded with the introduction of the gas turbine exhaust gases. Retrofitting steam power plants with such furnaces to combined gas-steam power plants of the type described is therefore only possible to a limited extent.
Auch ist nicht auszuschließen, daß durch die enge und vielfache Verknüpfung der beiden Teilprozesse die Verfügbarkeit der Ge¬ samtanlage negativ beeinflußt wird.It cannot be ruled out that the availability of the overall system will be adversely affected by the close and multiple connection of the two sub-processes.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Erzeugung von Energie in einer kombinierten."Gas- Dampfkraftanlage der eingangs genannten Art sowohl zur Erzielung höherer Wirkungsgrade als auch zur Erhöhung der Verfügbarkeit weiterzuentwickeln.The present invention is therefore based on the object of a method for generating energy in a combined. " To further develop gas-steam power plants of the type mentioned at the outset both in order to achieve higher efficiencies and to increase availability.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Gas¬ turbine eine mit Wasser aus dem Wasser-Dampfkreislauf der Gas- Dampfkraftanlage gespeiste Abhitzedampferzeugeranlage nachge¬ schaltet wird, daß die Temperatur des DampfStromes aus der Abhitzedampferzeugeranlage durch Zufuhr von Zusatzwärme an die Temperatur des Dampfstromes aus dem Dampferzeuger angeglichen wird und daß beide Dampfströme danach vermischt und der gleichen Dampfturbine zugeführt werden, wobei die einerseits für die
Erzeugung und Temperaturanpassung des Dampfstromes aus der Abhitzedampferzeugeranlage und andererseits für die Erzeugung des DampfStromes im Dampferzeuger benötigten Wärmemengen jeweils über feuerungsseitig voneinander unabhängigen Wärmeerzeugungs¬ und Wärmeübertragungssysteme zur Verfügung gestellt werden.This object is achieved in that the gas turbine is followed by a heat recovery steam generator system fed with water from the water-steam circuit of the gas-steam power plant, in that the temperature of the steam flow from the heat recovery steam generator system is supplied to the temperature of the steam flow from the by supplying additional heat Steam generator is adjusted and that both steam flows are then mixed and fed to the same steam turbine, the one hand for the Generation and temperature adjustment of the steam flow from the waste heat steam generator system and, on the other hand, the heat quantities required for the generation of the steam flow in the steam generator are each made available via heat generation and heat transfer systems that are independent of one another on the combustion side.
Das erfindungsgemäße Verfahren zeichnet sich durch eine voll¬ ständige feuerungsseitige Entkopplung der beiden Energieer¬ zeugungskreisläufe aus. Im Vergleich zum bekanntgewordenen Stand der Technik wird also das heiße Abgas der Gasturbine nicht in den Dampferzeuger eingeleitet, sondern zur Erzeugung von Pro¬ zeßdampf in einer eigenen Abhitzedampferzeugeranlage genutzt.The method according to the invention is characterized by a complete decoupling of the two energy generation circuits on the combustion side. In comparison to the state of the art that has become known, the hot exhaust gas from the gas turbine is therefore not introduced into the steam generator, but is used to generate process steam in a separate heat recovery steam generator system.
Durch eine derartige Entkopplung entfällt eine wesentliche Nahtstelle in der Gesamtanlage mit Vorteilen im Hinblick auf die Verbesserung von deren Verfügbarkeit.Such decoupling eliminates an essential interface in the overall system, with advantages in terms of improving its availability.
Auch werden bei einer nach dem erfindungsgemäßen Verfahren be¬ triebenen Kraftwerksanlage der Dampferzeuger selbst und in der Regel auch die nachgeschalteten Aggregate nicht mit zusätzlichen Abgasmengen aus dem Gasturbinenprozeß bzw. einer ggf. vorhan¬ denen Zusatz euerung zur Erzeugung der benötigten Zusatzwärme belastet.Also, in a power plant operated according to the method of the invention, the steam generator itself and generally also the downstream units are not burdened with additional amounts of exhaust gas from the gas turbine process or any additional control that may be required to generate the additional heat required.
Das erfindungsgemäße Verfahren eignet sich somit insbesondere auch zur Nachrüstung bzw. Erweiterung bestehender Dampfkraft¬ werke, da hierbei keine Eingriffe in den Feuerungsbereich des Dampferzeugers bzw. in die in den Rauchgasweg integrierten Wärmeableitungs- und Gasreinigungssysteme erforderlich werden.The method according to the invention is therefore particularly suitable for retrofitting or expanding existing steam power plants, since no interventions in the combustion area of the steam generator or in the heat dissipation and gas cleaning systems integrated in the flue gas path are necessary.
Die thermodynamische Verknüpfung der beiden Energieerzeugungs¬ kreisläufe erfolgt nach dem erfindungsgemäßen Verfahren aus¬ schließlich über den Wasser-Dampf reislauf. Die beiden in der Abhitzedampferzeugeranlage und im Dampferzeuger erzeugten hochgespannten Dampfteilströme werden nach Angleichung ihrer Dampfzustände, also im wesentlichen ihrer Temperaturen, ver
mischt und dann in der gleichen Dampfturbine arbeitsleistend entspannt.The thermodynamic linkage of the two energy generation cycles takes place according to the inventive method exclusively via the water-steam cycle. The two high-pressure partial steam flows generated in the waste heat steam generator system and in the steam generator are ver after adjustment of their steam states, that is, essentially their temperatures mixes and then relaxed working in the same steam turbine.
Dabei wird auch die zur Angleichung der Dampfströme benötigte Zusatzwärme ohne Einflußnahme auf die Feuerung des Dampf¬ erzeugers erzeugt und übertragen, d. h. es ist z. B. nicht vorgesehen, sofern die Zusatzwärme in einer Zusatzfeuerung erzeugt wird, die heißen Rauchgase dieser Zusatzfeuerung in die Feuerungsleistungszone des Dampferzeugers einzuleiten.The additional heat required for the adjustment of the steam flows is also generated and transmitted without influencing the firing of the steam generator. H. it is Z. B. not provided, if the additional heat is generated in an additional firing, the hot flue gases of this additional firing in the firing performance zone of the steam generator.
Die Erfindung sieht für den Fall einer Zusatzfeuerung vielmehr vor, den heißen Rauchgasstrom dieser Feuerung entweder dem Abga der Gasturbine vor Eintritt in die Abhitzedampferzeugeranlage oder auch dem Rauchgas des Dampferzeugers hinter der Feuerungs¬ leistungszone zuzumischen, um dann die Restwärme entweder in der Abhitzedampferzeugeranlage selbst oder auch in den im Rauchgasweg des Dampferzeugers integrierten Wärmetauschern zu nutzen. Dabei bietet sich eine Zumischung zum Abgas der Gas¬ turbine dann an, wenn die Zusatzfeuerung mit Gas oder Öl als Brennstoff betrieben wird, während eine Zumischung zum Rauch¬ gasstrom des Dampferzeugers bei einer mit festen Brennstoffen betriebenen Zusatzfeuerung eher in Frage kommt.Rather, in the case of additional firing, the invention provides for the hot flue gas stream from this firing to be mixed either with the exhaust gas from the gas turbine before it enters the heat recovery steam generator system or with the flue gas from the steam generator behind the firing power zone, in order to then also mix the residual heat either in the heat recovery steam generator system itself or also in the heat exchangers integrated in the flue gas path of the steam generator. In this case, admixing to the exhaust gas of the gas turbine is appropriate if the additional firing is operated with gas or oil as fuel, while admixing to the flue gas stream of the steam generator is more suitable in the case of an additional firing operated with solid fuels.
Nach einem weiteren Merkmal des erfindungsgemäßen Verfahrens kann die benötigte Zusatzwärme aber auch durch Wärmetausch mit dem im Dampferzeuger anfallenden heißen Rauchgas übertragen werden. Dabei kann die vollständige Unabhängigkeit der Systeme beispielsweise durch eine Dampftemperaturregelung der der Ab¬ hitzedampferzeugeranlage zuzuordnenden Dampfströme (Hoch¬ druckdampf, Zwischenüberhitzerdampf) erreicht werden.According to a further feature of the method according to the invention, the additional heat required can also be transferred by heat exchange with the hot flue gas generated in the steam generator. The complete independence of the systems can be achieved, for example, by regulating the steam temperature of the steam streams to be assigned to the heat recovery steam generator system (high-pressure steam, reheater steam).
Sofern das in der Brennkammer des Gasturbinenkreislaufes be¬ nötigte Brenngas in einer Kohlevergasungs- oder Kohleentga¬ sungsanlage erzeugt wird, kann die benötigte Zusatzwärme selbstverständlich auch aus einer solchen Anlage an geeigneter Stelle ausgekoppelt werden.
Das Leistungsverhältnis zwischen der Abhitzedampferzeugeranlage und dem Dampferzeuger liegt bei der erfindungsgemäß betriebenen Gas-Dampfkraftanlage zweckmäßigerweise bei 1, vorzugsweise zwischen 1 : 1 und 1 : 4.If the fuel gas required in the combustion chamber of the gas turbine cycle is generated in a coal gasification or coal degassing system, the additional heat required can of course also be extracted from such a system at a suitable point. The power ratio between the waste heat steam generator plant and the steam generator in the gas-steam power plant operated according to the invention is expediently 1, preferably between 1: 1 and 1: 4.
Dabei kann nach einem weiteren Merkmal der Erfindung das jeweils geforderte bzw. gewünschte Leistungsverhältnis von Abhitzedampf¬ erzeugeranlage zu Dampferzeuger durch die Anordnung mehrerer Gasturbinen, deren jeweilige Abhitzedampferzeugeranlagen in Bezug auf die Dampfführung parallel geschaltet sind, eingestellt werden.According to a further feature of the invention, the required or desired power ratio of the heat recovery steam generator system to the steam generator can be set by the arrangement of a plurality of gas turbines, the respective heat recovery steam generator systems of which are connected in parallel with respect to the steam flow.
Weitere Erläuterungen zu der Erfindung sind dem in der Figur schematisch dargestellten Ausführungsbeispiel zu entnehmen.Further explanations of the invention can be found in the exemplary embodiment shown schematically in the figure.
Die Figur zeigt schematisch eine nach dem erfindungsgemäßen Verfahren arbeitende kombinierte Gas-Dampfkraftanlage.The figure shows schematically a combined gas-steam power plant operating according to the method according to the invention.
Im Gasturbinenkreislauf wird über eine Leitung 1 angesaugte Frischluft in einem Verdichter 2 auf den Arbeitsdruck der Gasturbine verdichtet, in einer mit Erdgas befeuerten Brenn¬ kammer 3 stark erhitzt und dann in einer Gasturbine 4 arbeits- leistend entspannt. Die dabei gewonnene Energie wird an einen Generator 5 bzw. den Verdichter 2 abgegeben. Das noch heiße Abgas der Gasturbine wird über eine Leitung 6 einer Abhitze- -dampferzeugeranläge 7 zugeführt und dann über eine Leitung 8 und einen nicht dargestellten Kamin ins Freie geleitet.In the gas turbine circuit, fresh air drawn in via a line 1 is compressed in a compressor 2 to the working pressure of the gas turbine, strongly heated in a combustion chamber 3 fired with natural gas, and then relaxed in a gas turbine 4 to perform the work. The energy obtained in this way is delivered to a generator 5 or the compressor 2. The still hot exhaust gas from the gas turbine is fed via line 6 to a waste heat / steam generator system 7 and then passed outside via line 8 and a chimney (not shown).
Im Dampfturbinenkreislauf wird der in drei Turbinenstufen 9, 10 und 11, die auf gleicher Welle mit einem Generator 12 angeordnet sind, entspannte Arbeitsdampf in einem Kondensator 13 konden¬ siert und als Kondensat mittels einer Pumpe über parallel ge¬ schaltete Vorwärmer 15 und 16 in einen Speisewasserbehälter 17 gefördert.In the steam turbine circuit, the expanded working steam in three turbine stages 9, 10 and 11, which are arranged on the same shaft with a generator 12, is condensed in a condenser 13 and as condensate by means of a pump via preheaters 15 and 16 connected in parallel into one Feed water tank 17 promoted.
Das im Speisewasserbehälter 17 gesammelte Wasser wird in einer Hochdruckpumpe 18 auf Verfahrensdruck gepumpt und dann in zwei Teilströme aufgeteilt.
Der eine Teilstrom passiert über eine Leitung 19 zunächst einen entnahmedampfbeheizten Wärmetauscher 20 und wird dann einer kohlebefeuerten Dampferzeugeranlage 21, beispielsweise kann es sich hier um den Dampferzeuger eines bestehenden Kohlekraft¬ werkes handeln, zugeführt.The water collected in the feed water tank 17 is pumped to process pressure in a high pressure pump 18 and then divided into two partial flows. One of the partial streams first passes through a line 19 to a heat exchanger 20 heated by extraction steam and is then fed to a coal-fired steam generator system 21, for example it can be the steam generator of an existing coal-fired power plant.
Der zweite Teilstrom des auf Druck gebrachten Speisewassers wird nach der Erfindung über eine Leitung 22 der Abhitzedampferzeuger¬ anlage 7 zugeführt und in Heizflächen 23 im Wärmetausch mit dem heißen Abgas der Gasturbine 4 verdampft und überhitzt. Der dabei gewonnene, noch nicht endüberhitzte Dampf wird über eine Leitung 24 einem in diesem Ausführungsbeispiel gasbeheizten Endüber¬ hitzer 25 zugeführt und dort durch Zufuhr von Zusatzwärme auf die Temperatur des im Dampferzeuger 21 anfallenden überhitzten Wasserdampfes weiter erhitzt.According to the invention, the second partial flow of the pressurized feed water is fed to the heat recovery steam generator system 7 via a line 22 and is evaporated and heated in heating surfaces 23 in heat exchange with the hot exhaust gas from the gas turbine 4. The steam thus obtained, which has not yet been superheated, is fed via line 24 to a gas superheater 25 in this exemplary embodiment, where it is further heated to the temperature of the superheated steam generated in the steam generator 21 by supplying additional heat.
Beide nunmehr in ihren Dampfzuständen angeglichenen Teilstrδme aus dem Zusatzkessel 25 und der Dampferzeugeranlage 21 werden miteinander vermischt und der ersten Stufe 9 der dreistufigen Dampfturbine zugeführt. Vor Eintritt in die zweite Entspannungs¬ stufe 10 wird der teilentspannte Dampfström zwischenüberhitzt. Hierzu wird der Dampfström in zwei Teilströme aufgeteilt. Die Zwischenüberhitzung des einen Teilstromes erfolgt in Heizflächen 27 innerhalb des gasbeheizten Endüberhitzers 25, während der zweite Teilstrom in einem in den Rauchgasweg des Dampferzeugers integrierten Zwischenüberhitzer 28 erneut erhitzt wird. Zweckmäßigerweise entspricht dabei der in den Heizflächen 27 geführte Dampfteilstrom mengenmäßig dem über die Leitung 24 aus der Abhitzedampferzeugeranlage 7 strömenden Dampfström. Auf diese Weise erfolgt auch die Zwischenüberhitzung des in der Abhitzedampferzeugeranlage 7 erzeugten Dampfes unabhängig von den Wärmeerzeugungs- und Wärmeübertragungssystemen des Dampf¬ erzeugers 21, so daß z. B. ein Stillstand des Dampferzeugers 21 keine Auswirkungen auf die Zwischenüberhitzung des Dampfes aus der Abhitzedampferzeugeranlage 7 hat.Both partial streams from the auxiliary boiler 25 and the steam generator system 21, now adjusted in their steam states, are mixed together and fed to the first stage 9 of the three-stage steam turbine. Before entering the second relaxation stage 10, the partially relaxed steam flow is reheated. For this purpose, the steam flow is divided into two partial flows. The intermediate superheating of the one partial flow takes place in heating surfaces 27 within the gas-heated final superheater 25, while the second partial flow is reheated in an intermediate superheater 28 integrated into the flue gas path of the steam generator. Expediently, the partial steam flow in the heating surfaces 27 corresponds in quantity to the steam flow flowing out of the heat recovery steam generator system 7 via the line 24. In this way, the intermediate superheating of the steam generated in the heat recovery steam generator 7 takes place independently of the heat generation and heat transfer systems of the steam generator 21, so that, for. B. a standstill of the steam generator 21 has no effect on the reheating of the steam from the heat recovery steam generator 7.
Das im Zusatzkessel 25 anfallende noch heiße Rauchgas wird gemäß der Erfindung über eine Leitung 26 abgezogen, mit dem in der Leitung 6 strömenden heißen Abgas der Gasturbine 4 vermischt und
zusammen mit diesem in der Abhitzedampferzeugeranlage 7 abge¬ kühlt und dann aus der Anlage abgezogen.
The still hot flue gas obtained in the auxiliary boiler 25 is drawn off according to the invention via a line 26, mixed with the hot exhaust gas of the gas turbine 4 flowing in the line 6 and cooled together with this in the heat recovery steam generator 7 and then withdrawn from the system.
Claims
1. Verfahren zur Erzeugung von Energie in einer kombinierten Gas-Dampfkraftanlage mit einer Gasturbine und eines -vor¬ zugsweise kohlegefeuerten Dampferzeugers, dadurch gekenn¬ zeichnet, daß der Gasturbine eine mit Wasser aus dem Wasser-Dampfkreislauf der Gas-Dampfkraftanlage gespeiste Abhitzedampferzeugeranlage nachgeschaltet wird, daß die Temperatur des Dampfstromes aus der Abhitzedampferzeuger¬ anlage durch Zufuhr von Zusatzwärme an die Temperatur des Dampfstromes aus dem Dampferzeuger angeglichen wird und daß beide Dampfströme danach vermischt und der gleichen Dampftu bine zugeführt werden, wobei die einerseits für die Erzeu¬ gung und Temperaturangleichung des Dampfstromes aus der Abhitzedampferzeugeranläge und andererseits für die Erzeu¬ gung des Dampfstromes im Dampferzeuger benötigten Wärme¬ mengen jeweils über feuerungsseitig voneinander unabhängige Wärmeerzeugungs- und WärmeübertragungsSysteme zur Verfügung gestellt werden.1. A method for generating energy in a combined gas-steam power plant with a gas turbine and a — preferably coal-fired steam generator, characterized in that the gas turbine is followed by a waste heat steam generator plant fed with water from the water-steam circuit of the gas-steam power plant, that the temperature of the steam flow from the heat recovery steam generator system is adjusted to the temperature of the steam flow from the steam generator by supplying additional heat and that both steam flows are then mixed and fed to the same steam tube, the one for the generation and temperature adjustment of the steam flow from the waste heat steam generator plant and on the other hand, the heat quantities required for generating the steam flow in the steam generator are each made available via heat generation and heat transfer systems which are independent of one another on the combustion side.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zusatzwärme in einer eigenen Feuerung erzeugt und das dabei anfallende Rauchgas dem Abgas der Gasturbine vor Eintritt in die Abhitzedampferzeugeranlage zugeführt wird.2. The method according to claim 1, characterized in that the additional heat generated in its own furnace and the resulting flue gas is supplied to the exhaust gas of the gas turbine before entering the heat recovery steam generator system.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zusatzwärme in einer eigenen Feuerung erzeugt und das dabei anfallende Rauchgas dem Rauchgasstrom des Dampferzeugers hinter der Feuerungsleistungszone zugeführt wird.3. The method according to claim 1, characterized in that the additional heat is generated in a separate furnace and the resulting flue gas is fed to the flue gas stream of the steam generator behind the furnace performance zone.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zusatzwärme durch Wärmetausch mit dem im Dampferzeuger an¬ fallenden heißen Rauchgas übertragen wird. 4. The method according to claim 1, characterized in that the additional heat is transferred by heat exchange with the hot flue gas falling in the steam generator.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zusatzwärme aus einer das Brenngas für den Gasturbinenprozeß erzeugenden Kohlevergasungs- oder Kohleentgasungsanlage aus¬ gekoppelt wird.5. The method according to claim 1, characterized in that the additional heat is aus¬ coupled from a coal gasification or coal degassing plant generating the fuel gas for the gas turbine process.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekenn¬ zeichnet, daß das Leistungsverhältnis zwischen der Abhitze¬ dampferzeugeranlage und dem Dampferzeuger < l, vorzugs¬ weise zwischen 1 : 1 und 1 : 4 liegt.6. The method according to any one of claims 1 to 5, characterized gekenn¬ characterized in that the power ratio between the Abhitze¬ steam generator system and the steam generator <l, preferably between 1: 1 and 1: 4.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekenn¬ zeichnet, daß mehrere Gasturbinen mit ihren jeweiligen Ab¬ hitzedampferzeugeranlagen in Bezug auf die Dampfführung parallel geschaltet werden.7. The method according to any one of claims 1 to 6, characterized gekenn¬ characterized in that a plurality of gas turbines are connected in parallel with their respective Ab¬ heat steam generator systems with respect to the steam flow.
8. Verfahren nach einem der Ansprüche 1 bis 7, wobei der über¬ hitzte Dampf mehrstufig entspannt und zumindest nach der ersten Entspannungsstufe zwischenüberhitzt wird, dadurch gekennzeichnet, daß für die Zwischenüberhitzung zumindest eines Dampfteilstromes ein Teil der erzeugten Zusatzwärme verwendet wird.8. The method according to any one of claims 1 to 7, wherein the superheated steam is expanded in several stages and is reheated at least after the first relaxation stage, characterized in that part of the additional heat generated is used for the reheating of at least one partial steam stream.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß der mittels Zusatzwärme zwischenzuüberhitzende Dampfteilstrom mengenmäßig dem Dampfteilstrom aus der Abhitzedampferzeuger¬ anlage entspricht. 9. The method according to claim 8, characterized in that the partial steam to be superheated by means of additional heat corresponds to the steam partial flow from the Abhitzedampferzeuger¬ plant.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914117191 DE4117191C2 (en) | 1991-05-25 | 1991-05-25 | Combined gas-steam power plant to generate energy |
| DE4117191 | 1991-05-25 | ||
| PCT/DE1992/000414 WO1992021860A1 (en) | 1991-05-25 | 1992-05-21 | Energy generating process in a combined gas/steam generating power station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0586425A1 true EP0586425A1 (en) | 1994-03-16 |
| EP0586425B1 EP0586425B1 (en) | 1998-08-05 |
Family
ID=6432471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92910154A Expired - Lifetime EP0586425B1 (en) | 1991-05-25 | 1992-05-21 | Energy generating process in a combined gas/steam generating power station |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0586425B1 (en) |
| AU (1) | AU1694692A (en) |
| DE (2) | DE4117191C2 (en) |
| DK (1) | DK0586425T3 (en) |
| ES (1) | ES2121013T3 (en) |
| WO (1) | WO1992021860A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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. |
| ES2116137B1 (en) * | 1993-05-14 | 1999-04-16 | Rosado Serafin Mendoza | AN IMPROVEMENT PROCEDURE FOR COMBINED CYCLE POWER PLANTS WITH SUPPLY OF ENERGY TO THE STEAM CYCLE IN A FOSSIL FUEL BOILER. |
| ES2116139B1 (en) * | 1993-05-14 | 1999-04-16 | Rosado Serafin Mendoza | IMPROVEMENTS INTRODUCED IN INVENTION PATENT N-9301044 TITLED AN IMPROVEMENT PROCEDURE FOR COMBINED CYCLE POWER PLANTS WITH PARALLEL ENERGY CONTRIBUTION TO THE STEAM CYCLE IN A FOSSIL FUEL BOILER. |
| DE10001995A1 (en) * | 2000-01-19 | 2001-07-26 | Alstom Power Schweiz Ag Baden | Method for setting or regulating the steam temperature of the live steam and / or reheater steamer in a composite power plant and composite power plant for carrying out the method |
| GB2390121B (en) * | 2000-01-19 | 2004-08-04 | Alstom | Combined cycle power plant |
| IT1402363B1 (en) * | 2010-06-10 | 2013-09-04 | Turboden Srl | ORC PLANT WITH SYSTEM TO IMPROVE THE HEAT EXCHANGE BETWEEN THE SOURCE OF WARM FLUID AND WORK FLUID |
| DE102011102929A1 (en) * | 2011-05-31 | 2012-12-06 | Linde Aktiengesellschaft | Method and apparatus for the production of superheated steam |
| DE102012012683A1 (en) * | 2012-06-27 | 2014-01-02 | RERUM COGNITIO Institut GmbH | Method for electric power generation in cyclic process in two-stage combined gas and steam turbine process, involves obtaining high temperatures with positive effect of efficiency in low pressures upto material limit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3118429A (en) * | 1961-11-08 | 1964-01-21 | Combustion Eng | Power plant in which single cycle gas turbine operates in parallel with direct fired steam generator |
| DE2512774C2 (en) * | 1975-03-22 | 1982-09-02 | Brown, Boveri & Cie Ag, 6800 Mannheim | Combined gas-steam turbine system |
| CH645433A5 (en) * | 1980-04-11 | 1984-09-28 | Sulzer Ag | COMBINED GAS TURBINE STEAM POWER PLANT. |
| DE3815536C1 (en) * | 1988-05-06 | 1989-07-20 | Wolff Walsrode Ag, 3030 Walsrode, De | Heating and power station and method for generating heat energy in the form of steam and generating electrical energy |
| DE3926964A1 (en) * | 1989-08-16 | 1991-02-21 | Siemens Ag | METHOD FOR REDUCING THE CARBON DIOXIDE CONTENT OF THE EXHAUST GAS FROM A GAS AND STEAM TURBINE POWER PLANT AND POST-WORKING POWER PLANT |
-
1991
- 1991-05-25 DE DE19914117191 patent/DE4117191C2/en not_active Expired - Fee Related
-
1992
- 1992-05-21 DE DE59209451T patent/DE59209451D1/en not_active Expired - Lifetime
- 1992-05-21 AU AU16946/92A patent/AU1694692A/en not_active Abandoned
- 1992-05-21 WO PCT/DE1992/000414 patent/WO1992021860A1/en active IP Right Grant
- 1992-05-21 EP EP92910154A patent/EP0586425B1/en not_active Expired - Lifetime
- 1992-05-21 ES ES92910154T patent/ES2121013T3/en not_active Expired - Lifetime
- 1992-05-21 DK DK92910154T patent/DK0586425T3/en active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9221860A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59209451D1 (en) | 1998-09-10 |
| DE4117191A1 (en) | 1992-12-03 |
| DK0586425T3 (en) | 1999-05-03 |
| EP0586425B1 (en) | 1998-08-05 |
| DE4117191C2 (en) | 1994-11-24 |
| AU1694692A (en) | 1993-01-08 |
| ES2121013T3 (en) | 1998-11-16 |
| WO1992021860A1 (en) | 1992-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0778397B1 (en) | Method of operating a combined power plant with a waste heat boiler and a steam user | |
| EP0750718B1 (en) | Method of operating a gas and steam turbine installation and installation operating according to said method | |
| EP2368021B1 (en) | Waste heat steam generator and method for improved operation of a waste heat steam generator | |
| DE19829088C2 (en) | Electricity generation in a composite power plant with a gas and a steam turbine | |
| EP0591163B1 (en) | Combined gas and steam turbine plant | |
| WO2006131283A2 (en) | Steam generation plant and method for operation and retrofitting of a steam generation plant | |
| EP0720689A1 (en) | Device for cooling the gas-turbine coolant in a combined gas and steam turbine installation | |
| EP0648323B1 (en) | Steam power plant for generating electric power | |
| EP2167794B1 (en) | Device and method for the generation of power heat | |
| DE102018201172A1 (en) | Incinerator with residual heat utilization | |
| EP0515911B1 (en) | Method of operating a gas and steam turbine plant and corresponding plant | |
| EP0405235B1 (en) | Combined gas and steam turbine plant with coal gasification | |
| EP1105624A1 (en) | Gas and steam turbine unit | |
| EP1286030B1 (en) | Gas and air turbine powerplant | |
| EP0586425A1 (en) | Energy generating process in a combined gas/steam generating power station | |
| DE3224577A1 (en) | Combined gas turbine/steam turbine plant | |
| DE4131757A1 (en) | METHOD FOR THE ENVIRONMENTALLY FRIENDLY GENERATION OF ELECTRICAL ENERGY IN A COMBINED GAS STEAM POWER PLANT | |
| EP2839119A2 (en) | Forced cooling in steam turbine plants | |
| DE2802361C2 (en) | Steam power plant with a fluidized bed steam generator | |
| WO1992021858A1 (en) | Environmentally acceptable energy generation process and plant in a combined gas/steam generating power station | |
| WO2018050402A1 (en) | Plant and method having a thermal power plant and a process compressor | |
| WO1994004795A1 (en) | Energy generation process in a combined gas-steam power station | |
| DE3901451A1 (en) | METHOD FOR GENERATING ELECTRICAL ENERGY IN A COMBINED GAS TURBINE VAPOR POWER PLANT WITH ASSOCIATED FUEL GASIFICATION PLANT AND SYSTEM FOR IMPLEMENTING THE METHOD | |
| DE19542917A1 (en) | Combined turbine generating set | |
| WO1997007323A1 (en) | Gas and steam turbine plant and process for operating such a plant, also waste heat steam generator for a gas and steam turbine plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19931202 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE DK ES FR GB IT |
|
| 17Q | First examination report despatched |
Effective date: 19950315 |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE DK ES FR GB IT |
|
| REF | Corresponds to: |
Ref document number: 59209451 Country of ref document: DE Date of ref document: 19980910 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19981002 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2121013 Country of ref document: ES Kind code of ref document: T3 |
|
| ET | Fr: translation filed | ||
| REG | Reference to a national code |
Ref country code: DK Ref legal event code: T3 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990521 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990522 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990531 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19990521 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000131 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
| REG | Reference to a national code |
Ref country code: DK Ref legal event code: EBP |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20000610 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050521 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20110506 Year of fee payment: 20 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R081 Ref document number: 59209451 Country of ref document: DE Owner name: STEAG POWER SAAR GMBH, DE Free format text: FORMER OWNER: EVONIK NEW ENERGIES GMBH, 66111 SAARBRUECKEN, DE Effective date: 20120117 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 59209451 Country of ref document: DE |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 59209451 Country of ref document: DE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20120522 |