EP0713056A1 - Barreau de grille avec dispositif de refroidissement - Google Patents

Barreau de grille avec dispositif de refroidissement Download PDF

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Publication number
EP0713056A1
EP0713056A1 EP95116648A EP95116648A EP0713056A1 EP 0713056 A1 EP0713056 A1 EP 0713056A1 EP 95116648 A EP95116648 A EP 95116648A EP 95116648 A EP95116648 A EP 95116648A EP 0713056 A1 EP0713056 A1 EP 0713056A1
Authority
EP
European Patent Office
Prior art keywords
grate
block
grate block
cooled
water
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.)
Granted
Application number
EP95116648A
Other languages
German (de)
English (en)
Other versions
EP0713056B1 (fr
Inventor
Rolf Hauser
Daniel Morant
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.)
Hitachi Zosen Innova AG
Original Assignee
Von Roll Umwelttechnik AG
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Filing date
Publication date
Application filed by Von Roll Umwelttechnik AG filed Critical Von Roll Umwelttechnik AG
Publication of EP0713056A1 publication Critical patent/EP0713056A1/fr
Application granted granted Critical
Publication of EP0713056B1 publication Critical patent/EP0713056B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H7/00—Inclined or stepped grates
    • F23H7/06—Inclined or stepped grates with movable bars disposed parallel to direction of fuel feeding
    • F23H7/08—Inclined or stepped grates with movable bars disposed parallel to direction of fuel feeding reciprocating along their axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H3/00—Grates with hollow bars
    • F23H3/02—Grates with hollow bars internally cooled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H2900/00—Special features of combustion grates
    • F23H2900/03021—Liquid cooled grates

Definitions

  • the invention relates to a cooled grate block according to the preamble of claim 1.
  • a grate track has a plurality of rows of grate blocks arranged one behind the other in a step-like manner, each of which alternately fixed and movable rows of grate blocks follow one another.
  • the waste material on the grate for example waste, is pushed forward by a pushing movement of the movable rows of grate blocks and mixed at the same time.
  • a row of grate blocks is formed by several, usually 16 to 24 grate blocks, which are hung next to one another on a holding tube and braced together by means of a pull rod.
  • the individual grate blocks are cooled by air flowing through them, which at the same time serves as an oxidizing agent for combustion grates.
  • the grate blocks are exposed to high thermal stress, which results in high thermal stresses in the material of the grate blocks. Cracks can form in the material, which increases the risk of corrosion.
  • the grate blocks must be made of high-quality material, such as high-alloy steel. Because of the large thermal expansions, the size of the individual grate blocks is limited; it is a relatively large number of grate blocks are required in a row of grate blocks.
  • the object of the present invention is to reduce the thermal stress on the grate block and to enable a grate to be constructed which is simpler in terms of assembly and maintenance, but which also withstands all requirements better in terms of operation.
  • the advantages achieved by the invention can be seen in particular in the effective cooling, as a result of which thermal stresses and thermal expansions in the grate block are largely eliminated.
  • only a few, wider grate blocks - connected to one another in a simple manner - can form a grate block row. This not only simplifies assembly and replacement, but also significantly reduces the amount of rust falling through.
  • the grate block can also be made from less high quality material.
  • An inclined grating track is composed of several grating elements 3 in length; usually three to five grate elements 3 in a row arranged.
  • several grate tracks can be attached side by side; Usually one to four grate tracks form the width of the grate.
  • the number of grate elements 3 and the grate tracks depends on the predetermined throughput of the waste and on its calorific value.
  • Each grate element 3 has several, possibly eight grate block rows 4, 5 arranged one behind the other, with a fixed grate block row 4 being followed by a movable grate block row 5.
  • a plurality of grate blocks 6 are arranged next to one another in each grate block row 4, 5.
  • 16 to 24 air-cooled grate blocks 6 ′ in a row of grate blocks 4, 5 next to one another. As shown in FIG. 1, they were hung on a block holder tube 7 and braced by means of tie rods 14 and turnbuckle nuts (not shown).
  • the block holder tubes 7 of the fixed grate block rows 4 are carried by stationary brackets 8 according to FIG.
  • the block holder tubes 7 of the movable grate block rows 5 are fastened in brackets 9, which are assigned to a movable grate carriage 10.
  • Each grate element 3 is equipped with such a grate carriage 10.
  • the grate carriage 10 is driven by means of two hydraulic cylinders 11 arranged in parallel and thereby moved back and forth on rollers 12 on running surfaces 13. This also moves the movable grate block rows 5, which exert a pushing and shearing effect on the waste material located on the grate track 2, so that new ones are produced again and again Waste surfaces are exposed to thermal treatment in the combustion chamber while the waste material is conveyed forward.
  • the grate block 6 has a block body 20 of a U-shaped cross section, the upper wall of which is designated by 23 in FIGS. 3 and 4.
  • the outer surface of the upper wall 23 forms a usable surface 33 on which the waste to be treated comes to rest and along which it is transported.
  • a rear wall 21 of the block body 20 is provided with a hook 22 for hanging on the block holder tube 7 (FIG. 1).
  • the foot 26 of a grate block 6 is assigned to the upper wall 23 of a subsequent grate block 6; they are relatively mutually displaceable.
  • An inner cooling space 27 is enclosed by the block body 20, the base 28 and the foot 26, and two side walls 29.
  • a water supply line 30 opens into the cooling space 27.
  • the water supply is designated by an arrow W1 in FIG. 3.
  • a water supply cross line 31 connected to the water supply line 30 extends parallel to the rear wall 21 and is provided with outlet openings 32 at individual locations (three shown in FIG. 2). This water outlet is designated by an arrow W2 in FIG. 3.
  • Several, possibly three, longitudinally arranged water supply branch lines branch from the water supply cross line 31 34, which extend up to the front wall 24 and are angled there in such a way that their outlet opening 35 is located directly in front of the foot 26.
  • the water flowing out of the outlet opening 35 fills the closed cooling space 27 in the direction of an arrow W3 together with the water emerging from the outlet openings 32 (arrow W2), these counteracting both water flows in a certain sense and for good water mixing or for an enhanced cooling effect to care. It is important that the point of the grate block 6, which is particularly highly mechanically stressed, namely the foot 26, is acted upon directly by the cooling water.
  • the front corner 25 is exposed to the greatest temperatures and therefore the greatest thermal stress (cf. in particular Fig. 1, according to which it is easy to imagine which area of the grate blocks is constantly exposed to direct thermal stress or direct contact with the waste layer) no matter in which relative position there are currently movable and fixed grate block rows 4,5).
  • the lighter, already heated water rises to this point of the cooling space 27 and is additionally heated there.
  • inlet openings 41 FIG. 4
  • the entry of the heated water into the water discharge branch lines 40 is indicated by an arrow W4 in FIG. 4.
  • the water discharge branch lines 40 extend obliquely along the bottom 28 and open into a water discharge cross line 42 which is arranged parallel to the water supply cross line 31 and is offset further from this. From there, the heated water is discharged by means of a discharge line 43 in the direction of an arrow W5 (Fig. 4) led away from the cold room 27.
  • the appropriate arrangement of the cold water supply (outlet openings 35) and the hot water discharge (inlet openings 41) ensures the optimal cooling flow (it is also avoided, for example, that so-called "water pockets” with non-circulating water form at certain points, or that steam bubbles form in the area of corner 25 arise), protects the mechanically stressed foot 26 and avoids excessive thermal stress in the area of the front corner 25.
  • the water supply line 30 and the water discharge line 43 are connected in a manner not shown to a cold water low pressure system.
  • a connection to a closed cooling water system with a built-in heat exchanger is preferred.
  • the grate block 6 shown in FIGS. 2 to 4 which is intended for a combustion grate
  • air is distributed from below in the direction of an arrow L1 (FIG. 3) as an oxidizing agent necessary for the combustion by a number of uniformly distributed along the grate block width, between the Bottom 28 and the front wall 24 through the cooling space 27 extending tubes 46.
  • the front wall 24 has a plurality of air outlet openings 47 assigned to the tubes 46, from which the combustion air flows in the direction of an arrow L2. Since the air is only used as a combustion medium, but not as a cooling medium, hitherto fewer air outlet openings 47, which have to be cleaned laboriously because of clogging, are required than was previously the case.
  • the water-cooled grate blocks 6 according to the invention are used for a pyrolysis grate in which no air is driven through the grate as an oxidizing agent, the pipes 46 and the air outlet openings 47 which are exposed to the risk of clogging are completely eliminated. Since no air has to be passed through the grate 1, a thicker layer of waste can be applied to the grate 1.
  • the first grate element 3 which is intended for rapid ignition by start-up burners, can also consist of grate blocks 6 without pipes 46 and air outlet openings 47, since the water now provides cooling instead of the air.
  • the average temperature values on the grate can be significantly reduced thanks to the more favorable heat transfer numbers from the water compared to the air. If these values were between 350 ° and 700 ° C for air cooling, they could be reduced to approx. 50 ° to 100 ° C by water cooling.
  • the high thermal stresses and strains in the material, which were common in air-cooled grate blocks 6 ', are eliminated in the water cooling according to the invention.
  • fewer (three to four) wider grate blocks 6 can be arranged next to one another in a grate block row 4, 5 and form the width of the grate track 2.
  • the previous bracing by tie rods 14 (Fig.
  • Both the fixed and the movable grate block rows 4 and 5 are preferably composed of water-cooled grate blocks 6. It would also be possible to combine water and air cooling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Road Paving Structures (AREA)
  • Processing Of Solid Wastes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Air Conditioning Control Device (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Storage Of Fruits Or Vegetables (AREA)
EP95116648A 1994-11-17 1995-10-23 Barreau de grille avec dispositif de refroidissement Expired - Lifetime EP0713056B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH03452/94A CH688840A5 (de) 1994-11-17 1994-11-17 Kühlbarer Rostblock.
CH3452/94 1994-11-17

Publications (2)

Publication Number Publication Date
EP0713056A1 true EP0713056A1 (fr) 1996-05-22
EP0713056B1 EP0713056B1 (fr) 1999-05-19

Family

ID=4256258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116648A Expired - Lifetime EP0713056B1 (fr) 1994-11-17 1995-10-23 Barreau de grille avec dispositif de refroidissement

Country Status (14)

Country Link
US (1) US5617801A (fr)
EP (1) EP0713056B1 (fr)
JP (1) JP2831958B2 (fr)
AT (1) ATE180323T1 (fr)
CA (1) CA2161835A1 (fr)
CH (1) CH688840A5 (fr)
CZ (1) CZ290036B6 (fr)
DE (1) DE59505967D1 (fr)
DK (1) DK0713056T3 (fr)
ES (1) ES2087842T3 (fr)
FI (1) FI955535A (fr)
HU (1) HUT72543A (fr)
NO (1) NO305577B1 (fr)
PL (1) PL311406A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19648128A1 (de) * 1996-11-21 1998-05-28 Asea Brown Boveri Rost für eine Feuerungsanlage
EP0874195A1 (fr) * 1997-04-23 1998-10-28 Doikos Investments Ltd Grille de combustion coulissante refroidie à l'eau
EP0987494A1 (fr) * 1998-09-15 2000-03-22 Asea Brown Boveri AG Procédé pour le refroidissement d'une grille d'un foyer et grille d'un foyer
EP0989364A1 (fr) 1998-09-24 2000-03-29 Von Roll Umwelttechnik AG Elément de grille et procédé de refroidissement de ce dernier
WO2002035149A1 (fr) * 2000-10-25 2002-05-02 Von Roll Umweltechnik Ag Cuve de grille en tant qu"element d"une grille pour installation de traitement thermique de dechets
EP1281913A2 (fr) * 2001-08-01 2003-02-05 MARTIN GmbH für Umwelt- und Energietechnik Four à grille

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH689519A5 (de) * 1995-05-17 1999-05-31 Von Roll Umwelttechnik Ag Gekuehlter Rostblock.
JPH08319142A (ja) * 1995-05-25 1996-12-03 Chichibu Onoda Cement Corp 焼塊冷却装置
DE19929614C2 (de) * 1999-06-28 2001-04-26 Martin Umwelt & Energietech Feuerungsanlage mit flüssigkeitsgekühlten Rostelementen
TW457354B (en) * 1999-08-20 2001-10-01 Von Roll Umwelttechnik Ag Plant and grate block for the thermal treatment of waste materials
ATE237784T1 (de) * 2000-09-22 2003-05-15 Von Roll Umwelttechnik Ag Gekühlter rostblock
JP3734153B2 (ja) * 2001-06-08 2006-01-11 株式会社タクマ 水冷式火格子
ITMI20041745A1 (it) * 2004-09-14 2004-12-14 Tm E S P A Termomeccanica Impianto di smaltimento rifiuti
US20090151609A1 (en) * 2007-12-15 2009-06-18 Hoskinson Gordon H Incinerator with pivoting grating system
JP5422291B2 (ja) * 2009-07-30 2014-02-19 株式会社タクマ 水冷式ストーカ炉
BR112021025791A2 (pt) * 2019-07-05 2022-05-10 Hitachi Zosen Inova Ag Bloco de grelha para uma grelha de incineração

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE230498C (fr) * 1900-01-01
CH151094A (de) 1929-10-15 1931-11-30 Telefunken Gmbh Einrichtung zur automatischen Lautstärkeregulierung bei Radioempfängern.
US5235921A (en) * 1991-11-08 1993-08-17 Dunham Environmental Services, Inc. Combustion system having a movable hearth
EP0621449A1 (fr) * 1993-04-20 1994-10-26 Doikos Investments Ltd Procédé pour la combustion de déchets sur une grille de combustion ainsi qu'une grille de combustion pour la mise en oeuvre du procédé et barreau pour la fabrication d'une telle grille

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE498538C (de) * 1930-05-23 L & C Steinmueller Wassergekuehlter Treppenrost
DE624892C (de) * 1933-10-25 1936-01-30 Werner Koch Dr Wassergekuehlter Vorschubrost
US2171848A (en) * 1937-03-05 1939-09-05 Maurice A Hofft Water cooled grate bar
DE808263C (de) * 1948-10-02 1951-07-12 Steinmueller Gmbh L & C Selbstfoerdernder, wassergekuehlter Planrost
GB2143932A (en) * 1983-07-22 1985-02-20 Gordon Michael Priest Furnace
CH688871A5 (de) * 1994-05-16 1998-04-30 Von Roll Umwelttechnik Ag Verfahren zur thermischen Energiegewinnung aus Abfallmaterial, insbesondere Muell.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE230498C (fr) * 1900-01-01
CH151094A (de) 1929-10-15 1931-11-30 Telefunken Gmbh Einrichtung zur automatischen Lautstärkeregulierung bei Radioempfängern.
US5235921A (en) * 1991-11-08 1993-08-17 Dunham Environmental Services, Inc. Combustion system having a movable hearth
EP0621449A1 (fr) * 1993-04-20 1994-10-26 Doikos Investments Ltd Procédé pour la combustion de déchets sur une grille de combustion ainsi qu'une grille de combustion pour la mise en oeuvre du procédé et barreau pour la fabrication d'une telle grille

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19648128A1 (de) * 1996-11-21 1998-05-28 Asea Brown Boveri Rost für eine Feuerungsanlage
EP0844438A3 (fr) * 1996-11-21 1999-06-09 Asea Brown Boveri AG Grille pour un foyer
US5913274A (en) * 1996-11-21 1999-06-22 Asea Brown Boveri Ag Incineration grate with internal cooling
DE19648128C2 (de) * 1996-11-21 2002-11-07 Alstom Rost für eine Feuerungsanlage
EP0874195A1 (fr) * 1997-04-23 1998-10-28 Doikos Investments Ltd Grille de combustion coulissante refroidie à l'eau
US6213031B1 (en) 1998-09-15 2001-04-10 Asea Brown Boveri Ag Method of cooling a grate for a furnace and grate for a furnace
EP0987494A1 (fr) * 1998-09-15 2000-03-22 Asea Brown Boveri AG Procédé pour le refroidissement d'une grille d'un foyer et grille d'un foyer
EP0989364A1 (fr) 1998-09-24 2000-03-29 Von Roll Umwelttechnik AG Elément de grille et procédé de refroidissement de ce dernier
WO2002035149A1 (fr) * 2000-10-25 2002-05-02 Von Roll Umweltechnik Ag Cuve de grille en tant qu"element d"une grille pour installation de traitement thermique de dechets
CH695705A5 (de) 2000-10-25 2006-07-31 Von Roll Umwelttechnik Ag Rostwanne als Teil eines Rostes für eine Anlage zur thermischen Behandlung von Abfall.
CZ299895B6 (cs) * 2000-10-25 2008-12-29 Von Roll Umwelttechnik Ag Roštový element a roštová vana
EP1281913A2 (fr) * 2001-08-01 2003-02-05 MARTIN GmbH für Umwelt- und Energietechnik Four à grille
EP1281913A3 (fr) * 2001-08-01 2003-04-09 MARTIN GmbH für Umwelt- und Energietechnik Four à grille
CZ302839B6 (cs) * 2001-08-01 2011-12-07 Martin GmbH für Umwelt-und Energietechnik Roštové topenište

Also Published As

Publication number Publication date
CZ290036B6 (cs) 2002-05-15
NO954614L (no) 1996-05-20
FI955535A0 (fi) 1995-11-16
CA2161835A1 (fr) 1996-05-18
ES2087842T3 (es) 1999-08-16
JPH08219432A (ja) 1996-08-30
CH688840A5 (de) 1998-04-15
JP2831958B2 (ja) 1998-12-02
ES2087842T1 (es) 1996-08-01
HU9503110D0 (en) 1995-12-28
PL311406A1 (en) 1996-05-27
DK0713056T3 (da) 1999-11-08
NO305577B1 (no) 1999-06-21
DE59505967D1 (de) 1999-06-24
US5617801A (en) 1997-04-08
HUT72543A (en) 1996-05-28
NO954614D0 (no) 1995-11-15
EP0713056B1 (fr) 1999-05-19
ATE180323T1 (de) 1999-06-15
FI955535A (fi) 1996-05-18
CZ302595A3 (en) 1996-06-12

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