EP1198685B1 - Foyer comprenant un convoyeur d'evacuation vibrant et refroidi a l'air - Google Patents

Foyer comprenant un convoyeur d'evacuation vibrant et refroidi a l'air Download PDF

Info

Publication number
EP1198685B1
EP1198685B1 EP00951463A EP00951463A EP1198685B1 EP 1198685 B1 EP1198685 B1 EP 1198685B1 EP 00951463 A EP00951463 A EP 00951463A EP 00951463 A EP00951463 A EP 00951463A EP 1198685 B1 EP1198685 B1 EP 1198685B1
Authority
EP
European Patent Office
Prior art keywords
air
combustion chamber
cooling
furnace according
ash
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.)
Expired - Lifetime
Application number
EP00951463A
Other languages
German (de)
English (en)
Other versions
EP1198685A1 (fr
Inventor
Wolfgang Benesch
Reinhold Terhaar
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.)
Steag Energy Services GmbH
Original Assignee
Steag Encotec 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 Steag Encotec GmbH filed Critical Steag Encotec GmbH
Publication of EP1198685A1 publication Critical patent/EP1198685A1/fr
Application granted granted Critical
Publication of EP1198685B1 publication Critical patent/EP1198685B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/01002—Cooling of ashes from the combustion chamber by indirect heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
    • F23L2900/15041—Preheating combustion air by recuperating heat from ashes

Definitions

  • the invention relates to a furnace according to the preamble of claim 1.
  • the combustion chamber ash that is extracted from the bottom of the combustion chamber falls at a temperature of 800 to 1200 ° C.
  • the combustion chamber ash was dropped into a water bath, from which it was removed using the conveyor.
  • the ash quality has changed so that the subsequent transport process was problematic due to the lack of drainage of the ash.
  • the well-known dry ash removal process is operated with a hard coal combustion, which is described in a prospectus of the United States company United Conveyor Corporation from 1997.
  • the ashes are collected on grates and released in batches into a vacuum transport system.
  • the invention has for its object to improve the cooling of the combustion chamber ashes and their handling and removal.
  • the furnace according to the invention has the features of claim 1.
  • Vibratory conveyors are extremely robust, which is of great importance with regard to the abrasive properties of the combustion chamber ash. In addition, they provide high conveying capacities and easily allow both discontinuous and continuous operation, i.e. a very variable and effective dry ash removal process.
  • vibratory bowl feeders can be combined with very effective air cooling.
  • the temperature of the combustion chamber ash can therefore be effective during removal, i.e. can be quickly reduced to low values.
  • the invention is applicable above all to hard coal furnaces, but also to other types of furnaces, for example brown coal furnaces, refuse furnaces etc.
  • the cooling air penetrates the ash deposited in the vibrating channel and can then reach the combustion chamber, where it is used as preheated combustion air.
  • the vibrating trough with lateral nozzle openings for the cooling air. This leads to a very intensive cooling of the top of the ash deposit in the vibrating channel and the newly falling ash particles.
  • preheated combustion air is created for the combustion chamber.
  • the discharge device with nozzle openings for the cooling air. The combustion chamber ash is therefore cooled in countercurrent before being thrown onto the vibratory conveyor, which leads to very intensive cooling and preheating of the combustion air.
  • cooling air as preheated combustion air in the lower area of the combustion chamber brings an additional one advantageous effect, namely afterburning of the combustion chamber ash. This improves the burnout of the fuel (hard coal) and reduces the amount of combustion chamber ash.
  • the negative pressure prevailing in the combustion chamber can be sufficient to draw the cooling air through the individual nozzles.
  • the negative pressure in the combustion chamber can be sufficient to suck the cooling air through the air box.
  • a blower is used, it is preferably the fresh air blower that supplies the combustion chamber with combustion air. Part of this combustion air is thus branched off as cooling air and introduced into the combustion chamber as preheated air, either directly or after being returned to the combustion air flow.
  • the discharge device is provided with an angled outlet and that the vibratory conveyor is arranged below the angled outlet.
  • This training makes a significant contribution to the cooling process, since the vibratory conveyor is not in the direct radiation area of the combustion chamber. This improves cooling or reduces the cooling capacity required. It also enables the use of less high quality materials.
  • the discharge device is provided with closure flaps, which offer the possibility of delivering the combustion chamber ash to the vibratory conveyor in batches. In many cases, however, you will prefer a continuous ash discharge.
  • the flaps then offer the possibility of temporarily storing the ashes if there are brief faults in the area of the vibratory conveyor or minor repair or maintenance work needs to be carried out. This eliminates the need to shut down the furnace.
  • the main field of application of the invention is hard coal firing in power plants for steam generation.
  • the furnace according to FIG. 1 has a combustion chamber 1, at the lower end of which a discharge device 2 for combustion chamber ash is arranged. Below the discharge device 2 there is an oscillating conveyor 3, the conveying direction of which is perpendicular to the plane of the drawing.
  • the discharge device 2 has an angled outlet 4, so that the vibratory conveyor 3 is arranged offset and is not in the direct radiation area of the combustion chamber 1.
  • the vibratory conveyor 3 is therefore thermally shielded. An arrangement that is not offset is equally possible.
  • the vibrating conveyor 3 has a vibrating trough 5 which is arranged in an air box 6. As indicated in FIG. 2, the air box 6 is pressurized with compressed air, specifically via a line 7 which branches off from a combustion air line 8. The air flows under the vibrating trough 5 and causes indirect cooling of the ashes transported in the vibrating trough. To improve the heat transfer, the underside of the vibrating channel 5 is covered with cooling fins 9.
  • the air conveyed through the air box 6 is input as preheated combustion air into the furnace 1, in the present case via a separate line 10.
  • the preheated combustion air can also be conveyed back into the combustion air line 8 and from there directly or via the burners into the Reach the combustion chamber.
  • the vibratory conveyor 3 works with direct cooling.
  • 5 nozzle openings 12 are provided in the bottom of the vibrating trough, which blow the cooling air through the removed ashes.
  • Further nozzle openings 13 are provided in the side walls of the vibrating trough 5 in order to inflate cooling air onto the top of the ash and at the same time to cool falling ash particles.
  • FIG. 1 also shows that the discharge device also has two nozzle openings 14. These cool the falling ash particles in countercurrent, so in a very effective manner, and also cause the ashes to be burned again, which leads to a minimization of the amount of ash. Additional cooling air openings can be assigned to the furnace or the steam generator.
  • FIG. 1 shows that the discharge device 2 is provided with closure flaps 15, of which the left one is shown for clarification and the right one is shown semi-closed.
  • the closure flaps 15 permit discontinuous operation and, in the case of continuous operation, enable the short-term elimination of faults in the area of the vibrating conveyor without it being necessary to shut down the boiler system.
  • indirect cooling can be combined with direct cooling.
  • separate cooling air blowers can be used. It may be possible to dispense with any fan support if the vacuum in the furnace is sufficient to draw in the cooling air.
  • a blower support has the advantage, however, that the correspondingly high flow velocity in the nozzle openings can help prevent the nozzle openings from clogging.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Air Supply (AREA)

Claims (10)

  1. Installation de chauffe avec
    - un foyer (1),
    - au moins un dispositif d'évacuation (2) disposé à l'extrémité inférieure du foyer (1) pour des cendres de chambre de combustion sèches
    - un convoyeur continu disposé en dessous du dispositif d'évacuation (2) pour recueillir et évacuer les cendres évacuées à l'état sec, et
    - une installation de refroidissement des cendres au moyen d'air, où l'air de refroidissement est utilisé comme air de combustion préchauffé pour le foyer (1),
       caractérisé
    - en ce que le convoyeur est réalisé comme convoyeur oscillant (3) et présente une goulotte oscillante (5) ouverte vers le dispositif d'évacuation (2),
    - en ce que la goulotte oscillante (5) forme la paroi supérieure d'un caisson d'air (6) qui est relié au foyer (1) et
    - en ce que le fond de la goulotte oscillante (5) est pourvu d'ouvertures de buses (12) pour le passage de l'air de refroidissement.
  2. Installation de chauffe selon la revendication 1, caractérisé en ce que la goulotte oscillante (5) est pourvue d'ouvertures de buses latérales (13) pour l'air de refroidissement.
  3. Installation de chauffe selon la revendication 1 ou 2, caractérisé en ce que le dispositif d'évacuation (2) présente des ouvertures de buses (14) pour l'air de refroidissement.
  4. Installation de chauffe selon l'une des revendications 1 à 3, caractérisé en ce qu'au moins quelques-unes des ouvertures de buses (12 à 14) sont reliées à une soufflerie.
  5. Installation de chauffe selon l'une des revendications 1 à 4, caractérisé en ce que le côté inférieur de la goulotte oscillante (5) est pourvu de nervures de refroidissement (9) ou analogue.
  6. Installation de chauffe selon l'une des revendications 1 à 5, caractérisé en ce que le caisson d'air (6) est relié à une soufflerie.
  7. Installation de chauffe selon la revendication 6, caractérisé en ce que la soufflerie est la soufflerie de l'air de combustion.
  8. Installation de chauffe selon l'une des revendications 1 à 7, caractérisé en ce que l'air de refroidissement est introduit comme air de combustion préchauffé dans le flux d'air de combustion.
  9. Installation de chauffe selon l'une des revendications 1 à 8, caractérisé en ce que le dispositif d'évacuation (2) est pourvu d'une sortie coudée (4), et en ce que le convoyeur continu est disposé en dessous de la sortie coudée (4).
  10. Installation de chauffe selon l'une des revendications 1 à 9, caractérisé en ce que le dispositif d'évacuation (2) est pourvu de volets de fermeture (15).
EP00951463A 1999-08-03 2000-07-28 Foyer comprenant un convoyeur d'evacuation vibrant et refroidi a l'air Expired - Lifetime EP1198685B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19935597 1999-08-03
DE19935597A DE19935597C2 (de) 1999-08-03 1999-08-03 Feuerung
PCT/EP2000/007262 WO2001009549A1 (fr) 1999-08-03 2000-07-28 Foyer comprenant un convoyeur d'evacuation vibrant et refroidi a l'air

Publications (2)

Publication Number Publication Date
EP1198685A1 EP1198685A1 (fr) 2002-04-24
EP1198685B1 true EP1198685B1 (fr) 2004-03-31

Family

ID=7916449

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00951463A Expired - Lifetime EP1198685B1 (fr) 1999-08-03 2000-07-28 Foyer comprenant un convoyeur d'evacuation vibrant et refroidi a l'air

Country Status (9)

Country Link
US (1) US6745705B1 (fr)
EP (1) EP1198685B1 (fr)
CN (1) CN1153924C (fr)
AT (1) ATE263338T1 (fr)
DE (2) DE19935597C2 (fr)
ES (1) ES2218195T3 (fr)
PT (1) PT1198685E (fr)
TR (1) TR200200230T2 (fr)
WO (1) WO2001009549A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7559725B2 (en) * 2005-11-14 2009-07-14 General Kinematics Corporation Conveyor for and method of conveying heated material
KR100749754B1 (ko) * 2006-08-01 2007-08-17 삼성전자주식회사 직류 성분을 제어 가능한 인코딩과 디코딩 방법 및 이를이용한 데이터 처리 장치
US20090126219A1 (en) * 2007-11-19 2009-05-21 General Kinematics Corporation Method and System for Drying High-Moisture Content Plant Material
DE102010024020B4 (de) * 2010-06-16 2019-08-01 Clyde Bergemann Drycon Gmbh Fördermittel und Verfahren zum Fördern von heißem Material
US8826835B1 (en) 2011-01-18 2014-09-09 General Kinematics Corporation Controlling carbon content in conveyed heated material
US10088233B2 (en) 2013-01-31 2018-10-02 General Kinematics Corporation Vibratory dryer with mixing apparatus
CN104390347B (zh) * 2014-10-17 2017-05-03 安徽明太生物科技有限公司 一种节能锅炉系统
CN116576476A (zh) * 2023-07-11 2023-08-11 江苏大恒环境技术有限公司 炉锅一体化含盐废液焚烧炉炉底干法出灰装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE311639C (fr) * 1900-01-01
DE447081C (de) * 1926-02-10 1927-07-15 Spuelkraft A G Entaschungsvorrichtung fuer mehrere zusammenhaengende Kessel oder Kesselgruppen
EP0041860A3 (fr) * 1980-06-10 1982-02-10 Thorn Emi Energy Developments Limited Grille de foyer
EP0055748A1 (fr) * 1980-07-08 1982-07-14 JOHANSSON, Sjunne Moyens dans des installations de fours
US4503783A (en) * 1983-07-11 1985-03-12 General Kinematics Corporation Furnace ash air seal
GB8615634D0 (en) * 1986-06-26 1986-07-30 Incinerator Co Ltd Combustion apparatus
US4715763A (en) * 1986-07-25 1987-12-29 Smith & Mahoney, P.C. Dry ash removal system
US4901652A (en) * 1989-04-10 1990-02-20 John Zink Company Accumulating and conveying incinerator ash
IT1276747B1 (it) * 1995-06-19 1997-11-03 Magaldi Ricerche & Brevetti Estrattore/raffreddatore di materiali sfusi
DE19528765C2 (de) * 1995-08-04 1999-03-25 Siemens Ag Austragseinrichtung für eine Schweltrommel für Abfall
US5775237A (en) * 1996-12-30 1998-07-07 Florida Power Corporation Dry bottom ash handling system
IT1298162B1 (it) * 1998-01-15 1999-12-20 Magaldi Ricerche & Brevetti Apparecchiatura e metodo per la postcombustione di ceneri pesanti ad alto contenuto di incombusti

Also Published As

Publication number Publication date
ATE263338T1 (de) 2004-04-15
CN1369047A (zh) 2002-09-11
DE19935597A1 (de) 2001-02-15
WO2001009549A1 (fr) 2001-02-08
CN1153924C (zh) 2004-06-16
US6745705B1 (en) 2004-06-08
DE19935597C2 (de) 2002-03-14
TR200200230T2 (tr) 2002-08-21
EP1198685A1 (fr) 2002-04-24
ES2218195T3 (es) 2004-11-16
DE50005920D1 (de) 2004-05-06
PT1198685E (pt) 2004-08-31

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