WO2010057510A1 - Procédé pour générer une vapeur de traitement - Google Patents

Procédé pour générer une vapeur de traitement Download PDF

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Publication number
WO2010057510A1
WO2010057510A1 PCT/EP2008/009923 EP2008009923W WO2010057510A1 WO 2010057510 A1 WO2010057510 A1 WO 2010057510A1 EP 2008009923 W EP2008009923 W EP 2008009923W WO 2010057510 A1 WO2010057510 A1 WO 2010057510A1
Authority
WO
WIPO (PCT)
Prior art keywords
lignite
cooled
brown coal
conveyor
dried
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.)
Ceased
Application number
PCT/EP2008/009923
Other languages
German (de)
English (en)
Inventor
Hans-Joachim Klutz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RWE Power AG
Original Assignee
RWE Power AG
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 RWE Power AG filed Critical RWE Power AG
Priority to CN2008801320654A priority Critical patent/CN102224389B/zh
Priority to EP08875031.0A priority patent/EP2352960B1/fr
Priority to AU2008364235A priority patent/AU2008364235B2/en
Priority to PCT/EP2008/009923 priority patent/WO2010057510A1/fr
Priority to UAA201107959A priority patent/UA103064C2/uk
Priority to US13/130,978 priority patent/US20110283926A1/en
Priority to RU2011125918/06A priority patent/RU2484397C2/ru
Priority to PL08875031.0T priority patent/PL2352960T3/pl
Priority to CA2743982A priority patent/CA2743982C/fr
Publication of WO2010057510A1 publication Critical patent/WO2010057510A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • F26B17/045—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined the material on the belt being agitated, dispersed or turned over by mechanical means, e.g. by vibrating the belt, by fixed, rotating or oscillating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/007—Dust filtering; Exhaust dust filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F26B3/084—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed with heat exchange taking place in the fluidised bed, e.g. combined direct and indirect heat exchange
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/20—Drying

Definitions

  • the invention relates to a process for producing process steam by burning dried lignite in a steam generator, comprising drying moist brown coal in a fluidized bed dryer with heat exchanger components through which a heating medium, at least some of the water being expelled from the lignite and as vapors from the dryer is led out, the vapors are dedusted in a dedusting and the dried lignite is cooled in at least one of the fluidized bed dryer downstream cooler.
  • a fluidized-bed dryer or steam dryer is used for drying the lignite wet with brown coal before it is fired in a steam generator.
  • Fluid bed dryer provided within which the brown coal is heated by means of a tube bundle heat exchanger whose outer walls are in contact with the brown coal for a heat exchanger. At least one partial flow of the vapors discharged from the fluidized bed is compressed and fed to the heat exchanger as a heating medium, the vapors at least partially condense.
  • the vapor withdrawn from the dryer is dedusted in an electrostatic filter and burned in the steam generator after cooling.
  • the dried lignite is fed from the dryer to a cooler, which is exposed directly to cooling air.
  • the cooled lignite is then ground and burned in the form of lignite dust within the steam generator.
  • the dry coal discharged from the dryer can have an average particle size of about 0.4 to 2 mm. This can be dried in a cascade cooler, as described for example in DE 195 37 050 A1. Alternatively, the brown coal withdrawn from the dryer may be cooled in a fluidized bed cooler in which the cooling is cooled by direct contact with a cold gas, for example with air.
  • the filter dust discharged from the vapor by means of a solids separator, for example by means of an electrostatic precipitator has an average particle size of less than 100 .mu.m, so that it would be discharged as far as possible in a cascade cooler or fixed-bed cooler owing to the very low particle sinking rate and the required high quantities of cooling gas. Therefore, for example, the cooler described in DE 195 37 050 A1 is not suitable for cooling filter dusts.
  • the invention is therefore based on the object to improve the procedure according to the invention with regard to the cooling of brown coal fine dust.
  • the object is first of all achieved by a process for generating process steam by burning dried lignite in a steam generator, comprising drying moist brown coal in a fluidized bed dryer with heat exchanger components through which a heating medium, at least some of the water being expelled from the lignite and as vapors is led out of the dryer, the vapors are dedusted in a dedusting and the dried lignite is cooled in at least one of the fluidized bed dryer downstream cooler, wherein the method is characterized in that the obtained in the dedusting brown coal dust in direct contact with the dried and cooled lignite is brought.
  • the invention can be summarized in that in an advantageous manner, the already dried and cooled brown coal with a grain diameter of 0 to 2 mm is used as a cooling medium for cooling the filter dust.
  • the brown coal dust from the dedusting device for example from an electrostatic precipitator, is layered with the dried and cooled brown coal.
  • the mixing can also take place during the transport of the layered material streams.
  • cooling with air as a result of post-evaporation can be provided at the same time.
  • the cooled lignite and lignite dust are fed in succession to an endless conveying device, preferably in the form of a trough chain conveyor.
  • an endless conveying device preferably in the form of a trough chain conveyor.
  • the material layers of lignite dust and cooled brown coal can be mixed together by means of stationary mixing devices during transport.
  • a device for cooling lignite dust comprising an encapsulated conveyor with at least two in the conveying direction at a distance successively arranged inlet devices and at least one material discharge, wherein the feed devices are arranged so that the conveyor
  • a arranged in a housing endless conveyor can be provided.
  • stationary mixing internals can be arranged in the housing.
  • a trough chain conveyor is expediently provided, which rotates in an encapsulated housing.
  • mixing internals flow obstacles can be provided, which are arranged so that they dive into the conveyed material and cause a mixing of the material.
  • These internals may be formed, for example, in the manner of plowshares, which protrude into the loading cross section of the conveyor.
  • the trough chain conveyor according to the invention may for example be additionally flowed through with cold or preheated air, whereby a further cooling of the funded material flow, essentially by evaporation, is effected in an advantageous manner and condensate formation is prevented.
  • the invention will be explained below with reference to an embodiment shown in the drawings.
  • FIG. 1 is a flow chart of a portion of a steam generating process comprising drying lignite
  • FIG. 2 shows a schematic view of a cooler according to the invention
  • Figure 3 is a plan view of the cooler according to the invention.
  • FIG. 1 illustrates part of a steam generation process.
  • Lignite coal obtained from an open pit is first crushed and fed to a multistage fine grain preparation.
  • the lignite from the fine grain preparation with a mean grain diameter of 0 to 2 mm and a water content of about 55 to 65% is then fed to a fluidized bed dryer 1.
  • the coal is dried outside the combustion process to a residual moisture content of about 12%, optionally ground again and burned in a boiler, not shown, for the purpose of generating steam.
  • the steam is expanded in a known manner in steam turbines for the purpose of generating electricity.
  • the fluidized-bed dryer 1 serves to dry the lignite-wet lignite which comes into direct contact with the heat exchanger 2 arranged inside the fluidized-bed dryer 1.
  • a heat exchanger can be provided, for example, a tube bundle heat exchanger whose outer wall comes into contact with the brown coal for heat exchange.
  • the heat exchanger 2 or another heat exchanger can be flowed through, for example, with compressed vapors, as described for example in DE 195 18 644 A1.
  • the withdrawn from the fluidized bed dryer 1 vapors are dedusted in an electrostatic precipitator 3. For example, at least a portion of the vapors can be recompressed and used to heat the fluidized bed dryer 1.
  • the dry lignite accumulating in the fluid bed dryer 1 is fed via two screw conveyors (4) and downstream Zellenraddosier Anlagenen (5) two parallel operated fluidized bed coolers (6).
  • the lignite coal discharged from the fluid bed coolers (6) is in each case subjected to subsequent grinding in a downstream dry lignite coal mill (7) and fed to the cooler (8) according to the invention via a further cell wheel metering device (5).
  • the already dried, cooled and post-milled brown coal is deposited at two spaced locations of the cooler (8) as a cooling medium.
  • the cooler (8) is designed as an air-flow, encapsulated Trough chain conveyor.
  • the housing (9) of the cooler (8) is provided in total with three in the conveying direction at a distance successively arranged inlet devices 10a, b and c, with 10a a first upstream inlet device, with 10b a second downstream behind arranged inlet device and 10c downstream the second inlet device 10 b arranged third inlet device is called.
  • the material flows are introduced in layers into the cooler (8) via the inlet devices 10a, 10b and 10c connected in series, lignite dried and cooled via the first inlet device 10a, lignite dust not cooled via the second inlet device 10b and cooled brown coal dried via the third inlet device 10c is supplied.
  • lignite dust from the electrostatic precipitator (3) is withdrawn and fed via a Zellenraddosier Anlagen (5) and the second feed device (10b) to the radiator (8).
  • the conveying direction prevailing in the upper run (12) of the trough chain conveyor designed as a cooler (8) is shown from left to right in FIG. 1, likewise in FIG. 2, where the conveying direction or the direction of rotation is represented by arrows.
  • the cooler (8) comprises a substantially closed housing (9) with a peripheral conveyor chain (13). Within the housing (9) a trough-shaped upper run (12) and a trough-shaped lower run (14) is provided.
  • an air inlet (15) and an air outlet (16) are provided on the housing (9).
  • an air inlet (15) for cooling air Downstream of the air inlet (15), the first, second and third inlet devices (10a, 10b and 10c) are each provided in the form of an inlet chute in succession.
  • the air outlet (16) in the form of a fume hood is arranged downstream of the third inlet device. This is followed by an optionally provided fourth inlet device 10d downstream.
  • the cooler (8) is alternately layered cooled, dried and granular lignite, then brown coal dust and then downstream again cooled, dried, granular lignite abandoned.
  • the dried, cooled lignite leaves the fluidized bed cooler (6) with a temperature of about 30 - 50 ° C
  • the lignite dust leaves the electrostatic precipitator (3) having a temperature of about 105-120 0 C.
  • the mixing internals (18) in front of and behind the second inlet device 10b in the upper run (12) of the radiator (8) are arranged.
  • such mixing internals (18) may also be provided at any other point downstream.
  • the mixing internals (18) may be formed, for example, as tines, which have the geometry of plowshares.
  • the solution according to the invention has the technical advantage that the cooling of the warm brown coal fine dust takes place in a conveyor system which is generally required anyway for reasons of plant technology.
  • the cooling is particularly intense, as the warm dust is embedded and mixed between two cold layers of cooled lignite.
  • the rapid cooling and the intensive mixing is supported by the fixed or static mixing internals (18).
  • the mixing of the warm dust with the cooled lignite also has the advantage that a dust discharge is reliably prevented. LIST OF REFERENCES

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

L'invention concerne un procédé pour générer une vapeur de traitement par combustion de lignite séché dans un générateur de vapeur. Ce procédé comprend les étapes consistant : à sécher du lignite humide dans un séchoir en lit fluidisé (1) comportant des composants d'échange thermique (2) traversés par une substance de chauffage, au moins une partie de l'eau étant issue du lignite et évacuée du séchoir sous la forme de vapeur chaude; à dépoussiérer cette vapeur chaude dans un dispositif de dépoussiérage (3); et à refroidir le lignite séché dans au moins un appareil de réfrigération (6) monté en aval du séchoir en lit fluidisé (1). Le procédé selon l'invention est caractérisé en ce que la poussière de lignite apparaissant dans le dispositif de dépoussiérage est mise en contact direct avec le lignite séché et refroidi.
PCT/EP2008/009923 2008-11-24 2008-11-24 Procédé pour générer une vapeur de traitement Ceased WO2010057510A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CN2008801320654A CN102224389B (zh) 2008-11-24 2008-11-24 用于产生工艺蒸汽的方法
EP08875031.0A EP2352960B1 (fr) 2008-11-24 2008-11-24 Procédé et dispositif pour générer une vapeur de traitement par combustion de lignite déshydratée
AU2008364235A AU2008364235B2 (en) 2008-11-24 2008-11-24 Method for generating process steam
PCT/EP2008/009923 WO2010057510A1 (fr) 2008-11-24 2008-11-24 Procédé pour générer une vapeur de traitement
UAA201107959A UA103064C2 (uk) 2008-11-24 2008-11-24 Спосіб утворення технологічної пари
US13/130,978 US20110283926A1 (en) 2008-11-24 2008-11-24 Method for generating process steam
RU2011125918/06A RU2484397C2 (ru) 2008-11-24 2008-11-24 Способ образования технологического пара
PL08875031.0T PL2352960T3 (pl) 2008-11-24 2008-11-24 Sposób i urządzenie do wytwarzania pary procesowej poprzez spalanie osuszonego węgla brunatnego
CA2743982A CA2743982C (fr) 2008-11-24 2008-11-24 Procede pour generer une vapeur de traitement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/009923 WO2010057510A1 (fr) 2008-11-24 2008-11-24 Procédé pour générer une vapeur de traitement

Publications (1)

Publication Number Publication Date
WO2010057510A1 true WO2010057510A1 (fr) 2010-05-27

Family

ID=40888420

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/009923 Ceased WO2010057510A1 (fr) 2008-11-24 2008-11-24 Procédé pour générer une vapeur de traitement

Country Status (9)

Country Link
US (1) US20110283926A1 (fr)
EP (1) EP2352960B1 (fr)
CN (1) CN102224389B (fr)
AU (1) AU2008364235B2 (fr)
CA (1) CA2743982C (fr)
PL (1) PL2352960T3 (fr)
RU (1) RU2484397C2 (fr)
UA (1) UA103064C2 (fr)
WO (1) WO2010057510A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102798276A (zh) * 2012-08-28 2012-11-28 郑州市鼎力干燥设备有限公司 一种煤泥粉尘回烧炉燃烧装置
WO2014057025A3 (fr) * 2012-10-11 2015-01-22 Rwe Power Aktiengesellschaft Procédé permettant de faire fonctionner un générateur de vapeur
CN105157353A (zh) * 2015-03-06 2015-12-16 中昊晨光化工研究院有限公司 一种ptfe悬浮树脂的干燥系统及方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9518729B2 (en) * 2011-12-13 2016-12-13 Renmatix, Inc. Lignin fired supercritical or near critical water generator, system and method
CN102494517A (zh) * 2011-12-17 2012-06-13 无锡亿恩科技股份有限公司 一种褐煤梯级分段干燥系统
CN103423988B (zh) * 2013-08-30 2015-08-19 武汉工程大学 一种回收利用褐煤水分的低能耗褐煤干燥系统和干燥工艺

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2252814A (en) * 1939-10-25 1941-08-19 George N Perkins Coal drying apparatus
DE1090059B (de) * 1958-01-15 1960-09-29 Peters Ag Claudius Trogkettenzuteiler fuer Muehlen mit Vortrocknung des Mahlgutes im Zuteiler
DE1110827B (de) * 1958-08-12 1961-07-13 Graue G M B H Vorrichtung zum Kuehlen und Mischen von Giessereisand
DE2407603A1 (de) * 1974-02-16 1975-08-28 Aumund Foerdererbau Mischer fuer koernige, nicht klebende materialien
US4471536A (en) * 1981-06-19 1984-09-18 Voest-Alpine Aktiengesellschaft Device for drying coal
US4750913A (en) * 1986-12-19 1988-06-14 Shell Mining Company Cooling of dried coal
EP0273406A2 (fr) * 1986-12-31 1988-07-06 Rheinbraun Aktiengesellschaft Procédé et installation pour sécher du lignite dans un sécheur à lit fluidisé
DE3912586A1 (de) * 1988-05-05 1989-11-16 Waagner Biro Ag Verfahren und regenerationseinrichtung zur thermischen behandlung wie z. b. trocknung, verschwelung, vergasung pastoeser oder schlammartiger substanzen
US5123942A (en) * 1991-03-21 1992-06-23 Frazier-Simplex, Inc. System for charging batch/cullet in a glass furnace
DE4224560A1 (de) * 1992-07-24 1994-01-27 Bayer Ag Trogkettenförderer sowie deren Verwendung
DE19518644A1 (de) * 1995-05-20 1996-11-21 Rheinische Braunkohlenw Ag Verfahren und Einrichtung zum Erzeugen von Dampf durch Verbrennen eines festen getrockneten Brennstoffes
DE19537050A1 (de) * 1995-10-05 1997-04-10 Joest Gmbh & Co Kg Vorrichtung zum Kühlen von Trockenbraunkohle
FR2788795A1 (fr) * 1999-01-22 2000-07-28 Luc Latteux Installation pour le traitement de recyclage de deblais

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* Cited by examiner, † Cited by third party
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US2252814A (en) * 1939-10-25 1941-08-19 George N Perkins Coal drying apparatus
DE1090059B (de) * 1958-01-15 1960-09-29 Peters Ag Claudius Trogkettenzuteiler fuer Muehlen mit Vortrocknung des Mahlgutes im Zuteiler
DE1110827B (de) * 1958-08-12 1961-07-13 Graue G M B H Vorrichtung zum Kuehlen und Mischen von Giessereisand
DE2407603A1 (de) * 1974-02-16 1975-08-28 Aumund Foerdererbau Mischer fuer koernige, nicht klebende materialien
US4471536A (en) * 1981-06-19 1984-09-18 Voest-Alpine Aktiengesellschaft Device for drying coal
US4750913A (en) * 1986-12-19 1988-06-14 Shell Mining Company Cooling of dried coal
EP0273406A2 (fr) * 1986-12-31 1988-07-06 Rheinbraun Aktiengesellschaft Procédé et installation pour sécher du lignite dans un sécheur à lit fluidisé
DE3912586A1 (de) * 1988-05-05 1989-11-16 Waagner Biro Ag Verfahren und regenerationseinrichtung zur thermischen behandlung wie z. b. trocknung, verschwelung, vergasung pastoeser oder schlammartiger substanzen
US5123942A (en) * 1991-03-21 1992-06-23 Frazier-Simplex, Inc. System for charging batch/cullet in a glass furnace
DE4224560A1 (de) * 1992-07-24 1994-01-27 Bayer Ag Trogkettenförderer sowie deren Verwendung
DE19518644A1 (de) * 1995-05-20 1996-11-21 Rheinische Braunkohlenw Ag Verfahren und Einrichtung zum Erzeugen von Dampf durch Verbrennen eines festen getrockneten Brennstoffes
DE19537050A1 (de) * 1995-10-05 1997-04-10 Joest Gmbh & Co Kg Vorrichtung zum Kühlen von Trockenbraunkohle
FR2788795A1 (fr) * 1999-01-22 2000-07-28 Luc Latteux Installation pour le traitement de recyclage de deblais

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KLUTZ VON H-J ET AL: "DAS WTA-VERFAHREN ALS VORTROCKNUNGSSTUFE FUER MODERNE KRAFTWERKS- KONZEPTE AUF BASIS BRAUNKOHLE", VGB KRAFTWERKSTECHNIK, VGB KRAFTWERKSTECHNIK GMBH. ESSEN, DE, vol. 76, no. 3, 1 March 1996 (1996-03-01), pages 224 - 229, XP000559299, ISSN: 0372-5715 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102798276A (zh) * 2012-08-28 2012-11-28 郑州市鼎力干燥设备有限公司 一种煤泥粉尘回烧炉燃烧装置
WO2014057025A3 (fr) * 2012-10-11 2015-01-22 Rwe Power Aktiengesellschaft Procédé permettant de faire fonctionner un générateur de vapeur
CN105157353A (zh) * 2015-03-06 2015-12-16 中昊晨光化工研究院有限公司 一种ptfe悬浮树脂的干燥系统及方法

Also Published As

Publication number Publication date
CN102224389A (zh) 2011-10-19
EP2352960B1 (fr) 2016-03-16
RU2011125918A (ru) 2012-12-27
CA2743982C (fr) 2016-11-01
AU2008364235A1 (en) 2011-06-30
EP2352960A1 (fr) 2011-08-10
UA103064C2 (uk) 2013-09-10
CN102224389B (zh) 2013-10-02
CA2743982A1 (fr) 2010-05-27
RU2484397C2 (ru) 2013-06-10
AU2008364235B2 (en) 2013-05-16
US20110283926A1 (en) 2011-11-24
PL2352960T3 (pl) 2016-09-30

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