EP2352960B1 - Procédé et dispositif pour générer une vapeur de traitement par combustion de lignite déshydratée - Google Patents

Procédé et dispositif pour générer une vapeur de traitement par combustion de lignite déshydratée Download PDF

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Publication number
EP2352960B1
EP2352960B1 EP08875031.0A EP08875031A EP2352960B1 EP 2352960 B1 EP2352960 B1 EP 2352960B1 EP 08875031 A EP08875031 A EP 08875031A EP 2352960 B1 EP2352960 B1 EP 2352960B1
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EP
European Patent Office
Prior art keywords
lignite
cooled
dust
mixing
cooler
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.)
Not-in-force
Application number
EP08875031.0A
Other languages
German (de)
English (en)
Other versions
EP2352960A1 (fr
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
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RWE Power AG
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Filing date
Publication date
Application filed by RWE Power AG filed Critical RWE Power AG
Publication of EP2352960A1 publication Critical patent/EP2352960A1/fr
Application granted granted Critical
Publication of EP2352960B1 publication Critical patent/EP2352960B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 or elements attached to endless belts or chains 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 or elements attached to endless belts or chains 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 or elements attached to endless belts or chains 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.
  • Such a method according to the preamble of claim 1 is for example from the DE 195 18 644 A1 known.
  • the DE 195 37 050 A1 discloses an apparatus for cooling lignite according to the preamble of claim 5.
  • DE195 18 644 is for the drying of the pit-wet lignite prior to firing in a steam generator, a fluidized bed dryer or fluidized bed dryer provided within which the lignite 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 precipitator. 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 it is for example in the DE 195 37 050 A1 is described. 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, in the DE 195 37 050 A1 described cooler not suitable to cool 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 achieved by a method for generating process steam by burning dried brown coal in a steam generator, comprising the drying of moist brown coal in a fluidized bed dryer with heat exchangers flowed through by a heat exchanger installations, wherein at least a portion of the water expelled from the lignite and Vapors are 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, the process is characterized in that the obtained in the dedusting brown coal dust in direct contact with the dried and cooled Lignite is layered or mixed, the cooled lignite is used as a cooling medium in a cooler for lignite dust application.
  • 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 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 consecutively an endless conveyor, preferably in the form of a trough chain conveyor, abandoned.
  • 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 inlet devices are arranged so that the conveyor material flows different temperatures are available in layers.
  • a conveyor disposed in a housing endless conveyor is provided, and at least one with respect to the conveyor stationarily arranged mixing device.
  • 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 represents a part of a steam generation process. Crude lignite extracted from an open pit is first crushed and fed to a multistage fine grain treatment. The brown coal from the Feinkomaufleung 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. In the fluidized bed dryer 1, the coal is dried outside the combustion process to a residual moisture content of about 12%, optionally ground again and fired 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 fluid-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 for example in the DE 195 18 644 A1 is described.
  • 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 spur (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 in FIG ) from left to right, also in FIG. 2 where the conveying direction or the direction of rotation is shown by arrows.
  • FIGS. 2 to 4 From which the construction of the radiator (8) can be seen in detail.
  • 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 is initially provided.
  • 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 brown coal leaves the fluid bed cooler (6) at a temperature of about 30-50 ° C.
  • the lignite dust leaves the electrostatic precipitator (3) at a temperature of about 105-120 ° 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.

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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)

Claims (8)

  1. Procédé de génération d'une vapeur de procédé par combustion de lignite séché dans un générateur de vapeur, comprenant le séchage de lignite humide dans un séchoir à lit fluidisé (1) avec des composants d'échange de chaleur traversés par un milieu chauffant, au moins une partie de l'eau étant extraite du lignite et déchargée du séchoir sous forme de vapeurs, les vapeurs étant dépoussiérées dans un dispositif de dépoussiérage (3) et le lignite séché étant refroidi dans au moins un refroidisseur (6) connecté en aval du séchoir à lit fluidisé (1), et la poussière de lignite formée dans le dispositif de dépoussiérage (3) étant mise en contact direct avec le lignite séché et refroidi, caractérisé en ce que
    la poussière de lignite est stratifiée avec le lignite séché et refroidi, le lignite refroidi étant utilisé en tant que milieu de refroidissement dans un refroidisseur (8) pour la poussière de lignite, la stratification ayant lieu pendant le transport du lignite refroidi et un mélange ayant lieu pendant le transport des courants de matériaux stratifiés.
  2. Procédé selon la revendication 1, caractérisé en ce qu'au moins trois couches au total de lignite refroidi et de poussière de lignite sont stratifiées, le lignite refroidi et la poussière de lignite étant versés en alternance l'un sur l'autre.
  3. Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le lignite refroidi et la poussière de lignite sont placés l'un après l'autre sur un transporteur continu, de préférence sous la forme d'un transporteur en masse.
  4. Procédé selon la revendication 3, caractérisé en ce que les couches de matériaux de lignite refroidi et de poussière de lignite sont mélangées les unes avec les autres au moyen de dispositifs de mélange stationnaires pendant le transport.
  5. Dispositif pour le refroidissement de lignite par le procédé selon l'une quelconque des revendications 1 à 4, comprenant en tant que refroidisseur (8) un dispositif de transport encapsulé qui comprend au moins deux dispositifs d'alimentation (10a, b, c, d) agencés les uns après les autres à une distance dans la direction du transport et au moins une sortie de matériau, les dispositifs d'alimentation (10a, b, c, d) étant agencés de sorte que des courants de matériaux de températures différentes puissent être placés en couches sur le dispositif de transport, caractérisé en ce qu'un transporteur continu agencé dans un boîtier (9) est prévu en tant que dispositif de transport et en ce qu'au moins un dispositif de mélange agencé de manière stationnaire par rapport au dispositif de transport est prévu.
  6. Dispositif selon la revendication 5, caractérisé en ce que des composants de mélange stationnaires (18) sont prévus dans le boîtier (9) en tant que dispositif de mélange.
  7. Dispositif selon l'une quelconque des revendications 5 ou 6, caractérisé en ce qu'un transporteur en masse est prévu en tant que transporteur.
  8. Dispositif selon l'une quelconque des revendications 6 ou 7, caractérisé en ce que des entraves à l'écoulement sont prévues en tant que composants de mélange (18), qui sont agencées de manière à être immergées dans le matériau transporté et à réaliser un mélange du matériau.
EP08875031.0A 2008-11-24 2008-11-24 Procédé et dispositif pour générer une vapeur de traitement par combustion de lignite déshydratée Not-in-force EP2352960B1 (fr)

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 (2)

Publication Number Publication Date
EP2352960A1 EP2352960A1 (fr) 2011-08-10
EP2352960B1 true EP2352960B1 (fr) 2016-03-16

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EP08875031.0A Not-in-force EP2352960B1 (fr) 2008-11-24 2008-11-24 Procédé et dispositif pour générer une vapeur de traitement par combustion de lignite déshydratée

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)

Families Citing this family (6)

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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
CN102798276B (zh) * 2012-08-28 2014-12-03 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
DE102012019928A1 (de) * 2012-10-11 2014-04-30 Rwe Power Aktiengesellschaft Verfahren zum Betrieb eines Dampferzeugers
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
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

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Also Published As

Publication number Publication date
CA2743982C (fr) 2016-11-01
CN102224389A (zh) 2011-10-19
RU2484397C2 (ru) 2013-06-10
PL2352960T3 (pl) 2016-09-30
CA2743982A1 (fr) 2010-05-27
EP2352960A1 (fr) 2011-08-10
UA103064C2 (uk) 2013-09-10
AU2008364235B2 (en) 2013-05-16
CN102224389B (zh) 2013-10-02
AU2008364235A1 (en) 2011-06-30
RU2011125918A (ru) 2012-12-27
US20110283926A1 (en) 2011-11-24
WO2010057510A1 (fr) 2010-05-27

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