EP0639214B1 - Process for dressing brown coal for combined gas and steam processes - Google Patents

Process for dressing brown coal for combined gas and steam processes Download PDF

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Publication number
EP0639214B1
EP0639214B1 EP92904443A EP92904443A EP0639214B1 EP 0639214 B1 EP0639214 B1 EP 0639214B1 EP 92904443 A EP92904443 A EP 92904443A EP 92904443 A EP92904443 A EP 92904443A EP 0639214 B1 EP0639214 B1 EP 0639214B1
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EP
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Prior art keywords
steam
energy
gas turbine
operated
drying
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EP92904443A
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German (de)
French (fr)
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EP0639214A1 (en
Inventor
Bernd Dr. Krödel
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VEAG Vereinigte Energiewerke AG
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VEAG Vereinigte Energiewerke AG
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10F—DRYING OR WORKING-UP OF PEAT
    • C10F5/00—Drying or de-watering peat
    • 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
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
    • 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
    • F01K23/061—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 combustion in a fluidised bed
    • F01K23/062—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 combustion in a fluidised bed the combustion bed being pressurised
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F23K1/04—Heating fuel prior to delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2200/00—Mathematical features
    • F05B2200/20—Special functions
    • F05B2200/26—Special functions trigonometric
    • F05B2200/261—Sine

Definitions

  • the invention relates to a method for lignite processing for gas-steam combination processes of a heat generation system.
  • FIG. 1 Also known is a method for operating a gas-steam combination process (DE-OS 39 07 217).
  • the method is divided into two technological concepts, the concept shown in FIG. 1 including the operation of the ballast gas turbine with natural gas. This solution is trivial and has been in commercial use for years.
  • the second concept, shown in FIG. 2 includes pressure fluidized bed coal gasification of a coal partial flow. Since the coal partial flow gasification is preceded by a steam fluidized bed drying and this drying is not energetically linked to the combi block, it must be operated with electro-energy intensive vapor recompression and external vapor deduster, so that this block concept has a low efficiency of 42 - 44%.
  • the technical outlay on the plant is very large, since in addition to the typical combination block equipment, a gas turbine system, intercooling of air, connecting piping and ducts, a pressure-charged fluidized bed gasification reactor with associated hot gas deduster and an electro-energy-consuming drying technology (without an energetic combination with the combination block) are required.
  • a gas-steam combination block with a pressure-charged fluidized bed combustion in which a pressure dryer is integrated in terms of heat technology (WO 90/00219).
  • the vapors generated in the drying process and under pressure are fed into the steam boiler with steam fluidized bed combustion, mixed there with the combustion gases of the solid fuel system and, after exhaust gas dedusting, fed to the exhaust gas turbine and expanded there, so that the vapors thus injected into the flue gas stream perform more effectively in the exhaust gas turbine , without the need for proportional performance in air compression.
  • the associated shift in the power structure between gas and steam turbine power results in only a slight improvement in the block efficiency. This circuit does not allow phase-shifted recovery of the drying energy used to dry the moist fuel.
  • the invention has for its object to achieve a significant reduction in CO2 emissions per unit of power by reducing the use of fossil fuels, the drying facilities for raw lignite are connected to the heat generation system so that a full energy recovery of the vapor is realized.
  • the drying container is operated in conjunction with a pressure fluidized bed furnace, a gas turbine, a steam turbine, an air-heated steam reheater and a waste heat boiler, and the energy content of the vapor, which is under medium pressure and is dedusted, is used to evaporate a feed water partial stream and the gas turbine is operated with exhaust gases from the pressure fluidized bed furnace, steam is reheated by means of compressed combustion air when the combustion air is cooled, and the vapor condensate formed by the energetic combination is used to treat the circulation process after it has been treated.
  • the resulting vapor condensate is recycled without further treatment as process water in an ash / embedding product recycling in favor of a construction material use.
  • the dry coal produced in the energy network is burned in the pressure-charged fluidized bed furnace of the steam boiler with an excess of air in the range 2 ⁇ ⁇ 3.
  • the proposal according to the invention has the advantage that the gas-steam technology with pressure fluidized bed combustion can also be operated with highly humidified lignite and thereby achieves a process efficiency of 47% - 48% at nominal and part load as well as an excess air ratio of 2.7 becomes.

Abstract

The invention concerns a process for dressing brown coal for combined gas and steam processes in heat-generating installations. The aim of the invention is to achieve substantial reduction of the CO2 emission per useful effect unit by reduced use of fossil energy carriers; the devices for drying raw brown coal are to be connected to the heat-generating installation in such a manner that the energy of the exhaust vapours is fully utilized. To this end, the drying container is operated in conjunction with a pressurized fluidized bed combustor, a gas turbine, a steam turbine, a pneumatically heated steam intermediate heater and a waste heat boiler; the drying energy for the drying container is obtained from saturated steam from the waste heat boiler of the combined process; the energy content of the de-dusted exhaust vapours under medium pressure is used to evaporate a partial flow of feed water; the gas turbine is operated with exhaust gases from the pressurized fluidized bed combustor; condensed combustion air is used for intermediate superheating of the steam, with cooling of the combustion air; and the exhaust vapour condensate formed by energetic connection is prepared and used to supply water for the circulation process.

Description

Die Erfindung betrifft ein Verfahren zur Braunkohlenaufbereitung für Gas-Dampf-Kombiprozesse einer Wärmeerzeugungsanlage.The invention relates to a method for lignite processing for gas-steam combination processes of a heat generation system.

Bekannt ist eine Anordnung zur Vorstrom-Rohkohletrocknung für Kondensationskraftwerke, wobei die Brüdenkondensationswärme vollständig ausgenutzt und weder eine Brüdenrückverdichtung noch eine separate elektrische Brüdenentstaubung stattfindet, und die Trocknung in einem mit Membranrohrwänden als Heizflächen versehenen und mit Anzapfdampf als Heizdampf von der Hauptturbine versorgten Schüttungsschacht durchgeführt und der dabei entstandene Brüden beim Austritt in den Brüdenkanal - also beim Verlassen des Trockners - mittels dampfabreinigbarer Filterwand entstaubt wird (DD-PS 281 237). In 281 237 wird eine Brüdenenergie als Sekundärenergie vollständig nur durch Aufteilung in mehrere und qualitativ unterschiedliche Einsatzfälle genutzt, was eine aufwendige Einbindung in das Anlagengesamtkonzept bedingt. Außerdem ist diese Schaltungsanordnung ausschließlich auf einen Kraftwerksblock bezogen, der die Stromerzeugung nur im "reinen" Kondensationsbetrieb durchführt.An arrangement for pre-current raw coal drying for condensation power plants is known, whereby the vapor condensation heat is fully utilized and neither vapor recompression nor separate electrical vapor dedusting takes place, and the drying is carried out in a filling shaft provided with membrane tube walls as heating surfaces and supplied with bleed steam as heating steam from the main turbine vapors formed in the process when they exit the vapor channel - that is to say when they leave the dryer - are dedusted by means of a steam-cleanable filter wall (DD-PS 281 237). In 281 237, vapor energy is used entirely as secondary energy only by dividing it into several and qualitatively different applications, which requires complex integration into the overall system concept. In addition, this circuit arrangement relates exclusively to a power plant block that only generates electricity in "pure" condensation mode.

Weiterhin bekannt ist ein Verfahren zum Betreiben eines Gas-Dampf-Kombiprozesses (DE-OS 39 07 217). Das Verfahren gliedert sich in zwei technologische Konzepte, wobei das in Fig. 1 gezeigte Konzept den Betrieb der Vorschalt-Gasturbine mit Erdgas beinhaltet. Diese Lösung ist trivial und seit Jahren in kommerzieller Nutzung. Das zweite und in Fig. 2 gezeigte Konzept schließt eine Druckwirbelschicht-Kohlevergasung eines Kohleteilstromes ein. Da der Kohleteilstromvergasung noch eine Dampf-Wirbelschicht-Trocknung vorgeschaltet ist und diese Trocknung nicht im energetischen Verbund mit dem Kombiblock steht, muß diese mit elektroenergieintensiver Brüdenrückverdichtung und externem Brüdenentstauber betrieben werden, so daß dieses Blockkonzept einen niedrigen Wirkungsgrad von 42 - 44 % hat. Der anlagentechnische Aufwand ist sehr groß, da neben der typischen Kombiblockausstattung zusätzlich eine Gasturbinenanlage, eine Zwischenkühlung von Luft, verbindende Rohrleitung und Kanäle, ein druckaufgeladener Wirbelschicht-Vergasungsreaktor mit zugehörigem Heißgasentstauber und eine elektroenergieverbrauchende Trocknungstechnologie (ohne energetischen Verbund mit dem Kombiblock) notwendig werden.Also known is a method for operating a gas-steam combination process (DE-OS 39 07 217). The method is divided into two technological concepts, the concept shown in FIG. 1 including the operation of the ballast gas turbine with natural gas. This solution is trivial and has been in commercial use for years. The second concept, shown in FIG. 2, includes pressure fluidized bed coal gasification of a coal partial flow. Since the coal partial flow gasification is preceded by a steam fluidized bed drying and this drying is not energetically linked to the combi block, it must be operated with electro-energy intensive vapor recompression and external vapor deduster, so that this block concept has a low efficiency of 42 - 44%. The technical outlay on the plant is very large, since in addition to the typical combination block equipment, a gas turbine system, intercooling of air, connecting piping and ducts, a pressure-charged fluidized bed gasification reactor with associated hot gas deduster and an electro-energy-consuming drying technology (without an energetic combination with the combination block) are required.

Des weiteren ist ein Gas-Dampf-Kombiblock mit druckaufgeladener Wirbelschichtfeuerung bekannt, in dem ein Drucktrockner wärmetechnisch integriert ist (WO 90/00219). Der im Trocknungsprozeß entstehende und unter Druck stehende Brüden wird in den Dampfkessel mit Dampfwirbelschichtfeuerung geführt, dort mit den Verbrennungsgasen der Feststoffeuerung gemischt und nach einer Abgasentstaubung der Abgasturbine zugeführt und dort entspannt, so daß der so in den Rauchgasstrom eingespritzte Brüden in der Abgasturbine eine Mehrleistung verrichtet, ohne daß proportional bei der Luftverdichtung eine Mehrleistung in Anspruch genommen werden braucht. Durch die damit einhergehende Verschiebung in der Leistungsstruktur zwischen Gas- und Dampfturbinenleistung ergibt sich nur eine geringfügige Verbesserung des Blockwirkungsgrades. Diese Schaltung gestattet keine phasenverschobene Rückgewinnung der zur Trocknung des feuchten Brennstoffes eingesetzten Trocknungsenergie.Furthermore, a gas-steam combination block with a pressure-charged fluidized bed combustion is known, in which a pressure dryer is integrated in terms of heat technology (WO 90/00219). The vapors generated in the drying process and under pressure are fed into the steam boiler with steam fluidized bed combustion, mixed there with the combustion gases of the solid fuel system and, after exhaust gas dedusting, fed to the exhaust gas turbine and expanded there, so that the vapors thus injected into the flue gas stream perform more effectively in the exhaust gas turbine , without the need for proportional performance in air compression. The associated shift in the power structure between gas and steam turbine power results in only a slight improvement in the block efficiency. This circuit does not allow phase-shifted recovery of the drying energy used to dry the moist fuel.

Der Erfindung liegt die Aufgabe zugrunde, eine deutliche Reduzierung der CO₂-Emission je Nutzleistungseinheit durch verringerten Einsatz fossiler Energieträger zu erreichen, wobei die Trocknungseinrichtungen für Rohbraunkohle so mit der Wärmeerzeugungsanlage verbunden werden, daß eine vollständige energetische Verwertung des Brüdens realisiert wird.The invention has for its object to achieve a significant reduction in CO₂ emissions per unit of power by reducing the use of fossil fuels, the drying facilities for raw lignite are connected to the heat generation system so that a full energy recovery of the vapor is realized.

Dies wird erfindungsgemäß dadurch erreicht, daß der Trocknungsbehälter im Verbund mit einer Druck-Wirbelschicht-Feuerung, einer Gasturbine, einer Dampfturbine, eines luftbeheizten Dampf-Zwischenüberhitzers und eines Abhitzekessels betrieben wird, der Energieinhalt des unter Mitteldruck stehenden und entstaubten Brüdens zur Verdampfung eines Speisewasserteilstromes eingesetzt und die Gasturbine mit Abgasen aus der Druck-Wirbelschicht-Feuerung betrieben, mittels verdichteter Verbrennungsluft eine Dampf-Zwischenüberhitzung bei Verbrennungsluftkühlung durchgeführt und das durch energetischen Verbund entstehende Brüdenkondensat nach dessen Aufbereitung zur Wasserversorgung des Kreislaufprozesses eingesetzt wird.This is achieved according to the invention in that the drying container is operated in conjunction with a pressure fluidized bed furnace, a gas turbine, a steam turbine, an air-heated steam reheater and a waste heat boiler, and the energy content of the vapor, which is under medium pressure and is dedusted, is used to evaporate a feed water partial stream and the gas turbine is operated with exhaust gases from the pressure fluidized bed furnace, steam is reheated by means of compressed combustion air when the combustion air is cooled, and the vapor condensate formed by the energetic combination is used to treat the circulation process after it has been treated.

Das anfallende Brüdenkondensat wird ohne weitere Aufbereitung als Brauchwasser in einer Asche-/Einbindeprodukt-Verwertung zugunsten eines baustofftechnischen Einsatzes stofflich verwertet. Die im energietischen Verbund erzeugte Trockenkohle wird in der druckaufgeladenen Wirbelschichtfeuerung des Dampfkessels mit einem Luftüberschuß im Bereich 2 < λ < 3 verbrannt.The resulting vapor condensate is recycled without further treatment as process water in an ash / embedding product recycling in favor of a construction material use. The dry coal produced in the energy network is burned in the pressure-charged fluidized bed furnace of the steam boiler with an excess of air in the range 2 <λ <3.

Anhand eines Ausführungsbeispieles soll nachstehend die Erfindung näher erläutert werden. Dabei zeigt:

Fig. 1 -
den Rohbraunkohletrockner mit einem Kombiblock und einer Druckwirbelschichtfeuerung Die Rohbraunkohle 9 gelangt über eine Mühle in den brüdenkondensierenden Rohfeinkohle-Vorwärmer 8, dem der Trockner 1 mit Heizflächenpaket 2 nachgeordnet ist. Die Trockenkohle und ein Additiv werden über das Trockenkohle-Additiv-Eintragssystem 3 in den Dampfkessel 4 mit Druckwirbelschichtfeuerung geleitet. Der Dampfkessel 4 ist mit der Dampfturbine 5 verbunden, deren kalte Schiene 15 der Dämpfzwischenüberhitzung über einen luftbeheizten Dampfzwischenüberhitzer 13 mit der heißen Schiene 16 gekoppelt ist. Der Dampfkessel 4 ist weiterhin mit den Abgasturbinenstufen 12 einer Gasturbinenanlage verbunden, die mit einem Abhitzekessel 17 gekoppelt ist. Der Abhitzekessel 17 weist die Heizfläche 6 zur Sattdampferzeugung auf, die mit der Heizfläche 2 im Trockner 1 verschaltet ist. Der im Trockner 1 und im Vorwärmer 9 entstehende Brüden wird in einen brüdenkondensierenden Sattdampferzeuger 7 geleitet, der mit einem aschekühlenden Sattdampfüberhitzer 10 verbunden ist. Der Sattdampfüberhitzer 10 ist einerseits über die Dampfeinspeisungsleitung 14 mit der kalten Schiene 15 der Dampfturbine 5 und andererseits mit dem Dampfkessel 4 und der Ascheverwertung 21 gekoppelt. Der luftbeheizte Dampf zwischenüberhitzer 13 ist mit dem Dampfkessel 4 und den Luftverdichterstufen 11 der Gasturbinenanlage verbunden. Das im Sattdampferzeuger 7 und im Vorwärmer 8 anfallende Brüdenkondensat wird im Brüdenkondensatkühler 19 gekühlt und anschließend in die Brüdenkondensataufbereitung 20 geleitet. Ein Teilstrom 18 des gekühlten Brüdenkondensats wird der Ascheverwertung 21 zugeführt.
The invention will be explained in more detail below using an exemplary embodiment. It shows:
Fig. 1 -
the raw lignite dryer with a combination block and a pressure fluidized bed combustion The raw lignite 9 passes through a mill into the vapor-condensing raw fine coal preheater 8, which is followed by the dryer 1 with heating surface package 2. The dry coal and an additive are passed through the dry coal additive feed system 3 into the steam boiler 4 with pressure fluidized bed combustion. The steam boiler 4 is connected to the steam turbine 5, the cold rail 15 of the intermediate steam superheating is coupled to the hot rail 16 via an air-heated steam reheater 13. The steam boiler 4 is also connected to the exhaust gas turbine stages 12 of a gas turbine system, which is coupled to a waste heat boiler 17. The waste heat boiler 17 has the heating surface 6 for saturated steam generation, which is connected to the heating surface 2 in the dryer 1. The vapors formed in the dryer 1 and in the preheater 9 are passed into a vapor-condensing saturated steam generator 7, which is connected to an ash-cooling saturated steam superheater 10. The saturated steam superheater 10 is coupled on the one hand via the steam feed line 14 to the cold rail 15 of the steam turbine 5 and on the other hand to the steam boiler 4 and the ash recycling 21. The air-heated steam reheater 13 is connected to the steam boiler 4 and the air compressor stages 11 of the gas turbine system. The vapor condensate obtained in the saturated steam generator 7 and in the preheater 8 is cooled in the vapor condensate cooler 19 and then passed into the vapor condensate preparation 20. A partial stream 18 of the cooled vapor condensate is fed to the ash recycling 21.

Der erfindungsgemäße Vorschlag hat den Vorteil, daß die Gas-Dampf-Technologie mit Druck-Wirbelschicht-Feuerung auch mit hochfeuchter Braunkohle betrieben werden kann und dabei ein Prozeßwirkungsgrad von 47 % - 48 % bei Nenn- und Teillast sowie einer Luftüberschußzahl von 2,7 erreicht wird.The proposal according to the invention has the advantage that the gas-steam technology with pressure fluidized bed combustion can also be operated with highly humidified lignite and thereby achieves a process efficiency of 47% - 48% at nominal and part load as well as an excess air ratio of 2.7 becomes.

Aufstellung der verwendeten BezugszeichenList of the reference symbols used

11
Trocknerdryer
22nd
HeizflächenpaketHeating surface package
33rd
Trockenkohle-Additiv-EintragssystemDry coal additive feed system
44th
DampfkesselSteam boiler
55
DampfturbineSteam turbine
66
HeizflächeHeating surface
77
SattdampferzeugerSaturated steam generator
88th
VorwärmerPreheater
99
VorwärmerPreheater
1010th
SattdampfüberhitzerSaturated steam superheater
1111
LuftverdichterstufeAir compressor stage
1212th
AbgasturbinenstufeExhaust gas turbine stage
1313
DampfzwischenüberhitzerSteam reheater
1414
DampfeinspeisungsleitungSteam feed line
1515
kalte Schienecold rail
1616
heiße Schienehot rail
1717th
AbhitzekesselWaste heat boiler
1818th
TeilstromPartial flow
1919th
BrüdenkondensatkühlerVapor condensate cooler
2020th
BrüdenkondensataufbereitungVapor condensate treatment
2121
AscheverwertungAsh recycling
2222
LuftüberschußzahlExcess air figure
2323
ProzeßwirkungsgradProcess efficiency

Claims (3)

  1. Method for processing lignite for use in combined gas/steam cycles in an indirectly heated drying oven of a steam generation plant, wherein the energy for the drying oven is provided by saturated steam from a waste heat boiler coupled to the combined gas/steam cycle,
    characterized in that,
    the drying oven (1) is operated in direct connection with a pressurized vortex furnace (4), a gas turbine (12), a steam turbine (5), an air-heated steam reheater (13) and a waste heat boiler (17), that the energy carried by the exhaust vapors, which are cleaned of dust and at medium pressure, is used to evaporate a portion of the feedwater flow and that the gas turbine (12) is operated using waste gases from the pressurized vortex furnace (4), that steam reheating is carried out using compressed combustion air which cools in the process and the condensate from the exhaust vapors which form in the closed energy system is treated and used to supply water to the cyclic process.
  2. Method as claimed in claim 1, characterized in that the vapor condensate yielded is, without further processing, used as service water in the processing of ash/ash retention substance to be utilized as building materials.
  3. Method as claimed in claim 1, characterized in that the dry coal obtained in the closed energy system is burned in the pressurized vortex furnace (4) of the steam boiler (4) with excess air in the range 2 < λ < 3.
EP92904443A 1991-02-15 1992-02-13 Process for dressing brown coal for combined gas and steam processes Expired - Lifetime EP0639214B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4105128A DE4105128A1 (en) 1991-02-15 1991-02-15 METHOD FOR TREATING BROWN COAL FOR GAS-STEAM COMBINATION PROCESSES
DE4105128 1991-02-15
PCT/DE1992/000108 WO1992014802A1 (en) 1991-02-15 1992-02-13 Process for dressing brown coal for combined gas and steam processes

Publications (2)

Publication Number Publication Date
EP0639214A1 EP0639214A1 (en) 1995-02-22
EP0639214B1 true EP0639214B1 (en) 1996-05-08

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EP92904443A Expired - Lifetime EP0639214B1 (en) 1991-02-15 1992-02-13 Process for dressing brown coal for combined gas and steam processes

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EP (1) EP0639214B1 (en)
JP (1) JPH07507333A (en)
AU (1) AU651871B2 (en)
DE (2) DE4105128A1 (en)
WO (1) WO1992014802A1 (en)

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AU651871B2 (en) 1994-08-04
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AU1234792A (en) 1992-09-15
JPH07507333A (en) 1995-08-10
DE59206257D1 (en) 1996-06-13
EP0639214A1 (en) 1995-02-22

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