EP2498034A2 - Agencement de séchage par lit fluidisé - Google Patents

Agencement de séchage par lit fluidisé Download PDF

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Publication number
EP2498034A2
EP2498034A2 EP12152062A EP12152062A EP2498034A2 EP 2498034 A2 EP2498034 A2 EP 2498034A2 EP 12152062 A EP12152062 A EP 12152062A EP 12152062 A EP12152062 A EP 12152062A EP 2498034 A2 EP2498034 A2 EP 2498034A2
Authority
EP
European Patent Office
Prior art keywords
coal
fluidized
container
bed dryer
heating
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.)
Withdrawn
Application number
EP12152062A
Other languages
German (de)
English (en)
Other versions
EP2498034A3 (fr
Inventor
Jürgen Willmann
Jens Trenkel
Ralf Gerlach
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.)
Babcock Borsig Steinmueller GmbH
Original Assignee
Babcock Borsig Steinmueller GmbH
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 Babcock Borsig Steinmueller GmbH filed Critical Babcock Borsig Steinmueller GmbH
Publication of EP2498034A2 publication Critical patent/EP2498034A2/fr
Publication of EP2498034A3 publication Critical patent/EP2498034A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/20—Drying

Definitions

  • Coal in particular raw lignite, contains a high proportion of water.
  • a fluidized bed dryer can be used.
  • a fluidized bed dryer comprises a container into which the raw coal is introduced via a coal manhole in the upper area.
  • a nozzle bottom is arranged in the lower part of the container.
  • the nozzle bottom has a plurality of upwardly directed nozzles. From the nozzles, a fluid, such as vapor (vapors) exits with pressure.
  • the coal is blown up and forms a fluidized bed with quasi-fluid properties.
  • a heating arrangement is provided with a plurality of parallel heating tubes. The heating pipes are traversed by heating steam and transfer heat to the fluidized bed.
  • a fluidized-bed dryer arrangement is disclosed, for example, on the Internet at www.kohletrocknung.de.
  • the fluidized-bed dryer has an elongate, substantially cylindrical container with a nozzle bottom and a heating arrangement.
  • the longitudinal axis of the container is vertical.
  • the heating arrangement consists of a plurality of parallel heating pipes or heating plates.
  • the heating pipes or plates extend in the horizontal direction.
  • the longitudinal axis of the container is perpendicular to it in a vertical direction.
  • the heating pipes are held in vertical holders in the form of a steam distributor or condensate collector.
  • the heating pipes extend over the entire circular cross-section of the container. In the middle area, the heating pipes are correspondingly longer than in the edge area.
  • the heating pipes or plates are distributed as evenly as possible over the entire cross section of the heating arrangement.
  • a "good" division ratio for example, between 1.5 and 2 is desired.
  • the object is achieved in that no heating tubes or plates are provided in the area below the coal manhole. It can also be provided several, arranged in a row next to each other coal manholes and the area without heating pipes or - plates may be formed by a continuous, vertical lane.
  • the container is elongate and the heating arrangement has an outer geometry which is longer in the direction of the longitudinal axis of the container, as in the height.
  • the container may be in particular lying, i. with horizontal longitudinal axis.
  • the heating arrangement comprises a plurality of parallel heating tubes, the longitudinal axis of which runs parallel to the longitudinal axis of the container and parallel to the series of coal manholes.
  • the nozzle bottom preferably comprises a multiplicity of nozzles, which are also arranged in the region below the coal intake shaft.
  • the fluidized bed is generated accordingly in the vertical lane.
  • the width of the area without heating tubes or plates is 1/15 to 1/20, preferably 1/16 to 1/18 and more preferably 1 / 17.7 the width of the heater assembly.
  • the vertical lane is correspondingly comparatively narrow in comparison to the overall width of the heating arrangement. But it is considerably wider than the spaces between the heating pipes or plates.
  • At least 3 rows of nozzles of the nozzle plate can be arranged in the region below the coal intake shafts.
  • the cross section of the fluidized bed upper edge can easily decrease. This further improves the mixing of the raw coal.
  • the figures show a fluidized bed dryer arrangement.
  • the arrangement is used to dry raw lignite.
  • the fluidized bed dryer assembly comprises a container with a container shell 1 in a saddle bearing 18.
  • the container is formed substantially cylindrical. At the end faces of the container is curved outward.
  • the container is heated with a container heater 16, which has a Condensate collector 17 has.
  • the container is under a pressure of 4 bar.
  • the container heater 16 is fed from a distributor 15 with heating steam.
  • coal manholes 2 are provided in the upper part of the container.
  • suitable locks such as a rotary valve, are provided which allow the introduction of coal in the standing under a pressure of 4 bar container.
  • two vapor withdrawals 3 are arranged with a static separator 31. About the vapor exhausts 3 loaded with coal dust steam is discharged from the container interior.
  • dry lignite is fed via the feed 4 into the dryer. Dry lignite, which has been filtered from the vapors by means of a vapor filter, is returned via a return 5 in the container interior.
  • part of the pulverized coal is separated by a static separator 31, which then remains in the fluidized-bed dryer.
  • a static separator 31 which then remains in the fluidized-bed dryer.
  • a boarding door 6 is provided in the central region of the container shell. Laterally next to the access door 6, a sootblower 7 is provided for Schutulatgraphy during the Abfahrreaes and the destruction of coal floes.
  • the sootblower is a cleaning device, which avoidssvelkohleinblagerungen on the Schutulen during draining of the dryer, ie during the Abfahrvorgangs.
  • the sootblower 7 is operated with steam as a cleaning medium.
  • floe formation coal lumps
  • the rinsing device 30 is a rinsing nozzle, with which carbon deposits are eliminated on the dryer floor during emptying of the dryer.
  • a nozzle bottom 28 is arranged. From the nozzles of the nozzle plate 28 exits pressurized steam. With this steam, a fluidized bed of coal is produced. Part of the fluidization steam can be introduced via side nozzles 32 in the upper region of the fluidized bed in order to support the turbulence and thus the interference of the moist raw carbon.
  • the nozzles of the nozzle bottom are charged with different amounts of steam.
  • a larger amount of steam exits the nozzles than in the middle region.
  • too high steam quantities are uneconomical. It is therefore desirable to produce the fluidized bed with as little steam as possible.
  • the raw coal has a high water content in the range of, for example, 50-60%. The surface moisture therefore leads to bonding. If the raw coal from the coal manholes 2 comes down, there is a risk of floe formation. A higher amount of steam from the nozzles of the nozzle bottom 28 below the coal manholes 2 increases the particle velocity and avoids the risk of floe formation. In the dryer zone in the middle area of the nozzle bottom, this high amount of steam is not required. There you can work with usual amounts of steam. In this way, it continues to work with a minimum of steam.
  • a condensation heating surface 22 is arranged in the lower, central region of the container above the nozzle bottom.
  • the Kondensationsterrorism composition 22 consists of a plurality of parallel heating tubes of equal length. It extends over the entire length of the substantially cylindrical part of the container.
  • the heating pipes are held by a support 26.
  • the longitudinal axis of the heating pipes runs from right to left in FIG. 4 parallel to the longitudinal axis of the container.
  • cross section in FIG. 6 It can be seen that the heating pipes almost extend to the container wall zoom. As a result, the dead volume is kept low.
  • the heating tubes of the condensation heating surface 22 are welded to a perforated plate 27.
  • the perforated plate 27 is part of a partition wall between the fluidized bed and a laterally arranged antechamber.
  • the corresponding perforated plate with a hemispherical shell forms an outlet chamber 23.
  • the inlet chamber 21 is connected via connecting tubes 20 to a heating steam inlet 9.
  • the inlet chamber 21 has a condensate drain 25.
  • the outlet chamber 23 has a condensate drain 24.
  • Heating steam enters via the Schudampfeintritt 9 and the connecting tubes 20 in the inlet chamber 21 a. This forms a distributor.
  • the heating steam passes through the holes in the perforated plate 27 in the welded thereto heating tubes the Kondensationsterrorism Structure 22.
  • the Schudampfkondensat passes through the holes of the perforated plate 27 in the outlet chamber 23. This forms a collector. Due to the condensate drain 24 occurs water, which is condensed in the fluidized bed in the heating tubes, again from.
  • the coal entering through the coal manhole 2 enters the fluidized bed.
  • the fluidized bed is heated and dried.
  • the dry lignite is transported via a connection shaft 29 in the bottom of the container to a screw conveyor. There it is available for further use.
  • the inlet and outlet chambers 21 and 23 can be hemispherical in shape.
  • the monitoring of the arrangement is done with measuring instruments. These include thermocouples, which are arranged at temperature measuring points 11 and pressure gauge for measuring the pressure at pressure measuring points 12. A visual monitoring of the drying process via a sight glass 13 with flushing.
  • the condensation heating surface 22 has a continuous, vertical lane 14 in the longitudinal direction of the container 1. There are no heating pipes in it.
  • the vertical lane is directly below the coal manholes 2 in the center of the vessel.
  • With the lane 14 is an improved mixing of the raw coal in the Dry coal reached.
  • the raw coal is better distributed and can not remain above the coal bed of the fluidized bed.
  • the coal top edge is not too close above the condensation heating surface to avoid floe formation. A gap in the dry area leads to a good introduction of the raw coal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
EP12152062.1A 2011-03-02 2012-01-23 Agencement de séchage par lit fluidisé Withdrawn EP2498034A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011001033A DE102011001033A1 (de) 2011-03-02 2011-03-02 Wirbelschicht-Trockneranordnung

Publications (2)

Publication Number Publication Date
EP2498034A2 true EP2498034A2 (fr) 2012-09-12
EP2498034A3 EP2498034A3 (fr) 2015-09-23

Family

ID=45655188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12152062.1A Withdrawn EP2498034A3 (fr) 2011-03-02 2012-01-23 Agencement de séchage par lit fluidisé

Country Status (2)

Country Link
EP (1) EP2498034A3 (fr)
DE (1) DE102011001033A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116772519A (zh) * 2022-03-10 2023-09-19 沈阳环境科学研究院 基于喷动式内循环床的低阶煤干燥提质设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0343407A1 (fr) * 1988-05-11 1989-11-29 Waagner-Biro Aktiengesellschaft Dispositif pour introduire la matière à fluidiser dans un lit fluidisé, en particulier une installation de séchage
EP0819900A1 (fr) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Installation pour le séchage à lit fluidisé par vapeur de lignite brut
DE19620047C2 (de) 1996-05-18 2002-06-27 Rwe Rheinbraun Ag Verfahren und Vorrichtung zum Trocknen von Braunkohle
DE102010003613A1 (de) * 2010-04-01 2011-10-06 Brandenburgische Technische Universität Cottbus Verfahren und Vorrichtung zum Trocknen von Kohle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3644806C1 (en) * 1986-12-31 1993-05-13 Rheinische Braunkohlenw Ag Process and plant for drying crude lignite in a fluidized-bed dryer
EP0819903A1 (fr) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Installation de séchage de lignite
CN102177406B (zh) * 2008-08-12 2013-11-06 施维英生物泥公司 闭环干燥系统和方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0343407A1 (fr) * 1988-05-11 1989-11-29 Waagner-Biro Aktiengesellschaft Dispositif pour introduire la matière à fluidiser dans un lit fluidisé, en particulier une installation de séchage
DE19620047C2 (de) 1996-05-18 2002-06-27 Rwe Rheinbraun Ag Verfahren und Vorrichtung zum Trocknen von Braunkohle
EP0819900A1 (fr) * 1996-07-17 1998-01-21 GEA Wärme- und Umwelttechnik GmbH Installation pour le séchage à lit fluidisé par vapeur de lignite brut
DE102010003613A1 (de) * 2010-04-01 2011-10-06 Brandenburgische Technische Universität Cottbus Verfahren und Vorrichtung zum Trocknen von Kohle

Also Published As

Publication number Publication date
DE102011001033A1 (de) 2012-09-06
EP2498034A3 (fr) 2015-09-23

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