[go: up one dir, main page]

WO1999063270A1 - Grille a tubes refroidis par l'eau destine a un four a combustion - Google Patents

Grille a tubes refroidis par l'eau destine a un four a combustion Download PDF

Info

Publication number
WO1999063270A1
WO1999063270A1 PCT/IB1999/000936 IB9900936W WO9963270A1 WO 1999063270 A1 WO1999063270 A1 WO 1999063270A1 IB 9900936 W IB9900936 W IB 9900936W WO 9963270 A1 WO9963270 A1 WO 9963270A1
Authority
WO
WIPO (PCT)
Prior art keywords
grate
ducts
shaft assembly
grate element
girder
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/IB1999/000936
Other languages
English (en)
Inventor
Hans Boegh Andersen
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.)
FLS Miljo AS
Original Assignee
FLS Miljo AS
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 FLS Miljo AS filed Critical FLS Miljo AS
Priority to DE69910783T priority Critical patent/DE69910783T8/de
Priority to EP99919478A priority patent/EP1092114B1/fr
Priority to AT99919478T priority patent/ATE248323T1/de
Priority to AU37253/99A priority patent/AU3725399A/en
Priority to DK99919478T priority patent/DK1092114T3/da
Publication of WO1999063270A1 publication Critical patent/WO1999063270A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F23H17/00—Details of grates
    • F23H17/08—Bearers; Frames; Spacers; Supports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H17/00—Details of grates
    • F23H17/12—Fire-bars
    • 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
    • F23H7/10—Inclined or stepped grates with movable bars disposed parallel to direction of fuel feeding rocking about their axes
    • 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 present invention relates to a grate device for a combustion furnace, said device comprising a grate element and a turnable shaft assembly connected thereto.
  • Such devices are already known, for instance, from US-A-4 , 981, 090.
  • use is made of slots between the individual grate elements, on which material intended for combustion is placed, for supplying primary air for the combustion.
  • a grate device in which the temperature of the grate elements is always kept at such a low level that the risk of excessive abrasive wear is eliminated.
  • One way of achieving this is to provide the grate elements with coolant ducts, through which water, for instance, is passed for cooling of the elements to an acceptable temperature level.
  • the problem of such cooling is the actual supply of coolant, which is rendered more difficult by the fact that the grate elements have to be pivotable for construction reasons.
  • An obvious solution could be to supply the coolant by means of flexible tubes, which are directly connected to the grate elements and follow their movement.
  • a grate device without such flexible tubes under the grate element is disclosed in US-A-4 , 596 , 233.
  • parts of the grate element that is a great number of grate bars, on which the actual combustion takes place, are not included in a coolant coil. This is a dis- advantage to the service life of the grate element, since a high grate temperature causes great erosion of the grate bars.
  • a high grate temperature naturally, also implies that the material selected for the grate element should satisfy strict requirements. For this reason, cast grate bars made of high-grade steel are predominant today.
  • an object of the present invention is to provide a new solution for the supply of coolant to grate elements which are cooled by a coolant and which are of the type mentioned by way of introduction, said solution being distinguished by being very reliable and contributing to an increased service life of the grate elements.
  • the solution according to the invention should be easy to implement and require less in terms of material selection than the above-mentioned grate bars.
  • a grate device for a combustion furnace comprising a grate element and a turnable shaft assembly connected thereto, the grate element having a first system of ducts for circulating coolant through the grate element, the shaft assembly having a second system of ducts, which communicates with the first system of ducts and forms a coolant inlet and outlet, and the grate element comprising a girder means which is non-rotatably connected with the shaft assembly, said device being characterised in that the girder means contains a part of the first system of ducts, which part communicates with the second system of ducts, and that the grate element comprises a plate means, which is mounted on the girder means and forms a grate area and through which the remaining part of the first system of ducts extends for cooling the grate area.
  • inventive cooling by the coolant in the entire grate element it is possible to increase the service life of the element and avoid the conventional structure of grate elements comprising a plurality of re- placeable grate bars.
  • inventive plate means which covers a larger surface than an ordinary grate bar, results in only a few connections being needed for the first system of ducts between the girder means and the plate means. It will be understood that all this taken together makes it possible to produce an inventive grate device which is both cheaper and better than the prior-art solutions.
  • the second system of ducts is preferably a feeding and a return con- duit, of which at least one is formed of an inner pipe which is concentric with the axis of the shaft assembly.
  • the other of the feeding and the return conduit is suitably formed of an outer pipe on the outside of the inner pipe.
  • the outer pipe comprises an end portion which is non-rotatably connected with the grate element and through which lateral ducts extend, which communicate with the feeding and the return conduit and which form the connection of the second system of ducts with the first system of ducts. It will be understood that an end portion formed in this manner considerably facilitates the interconnection of the different systems of ducts as well as the non-rotary connection of the shaft assembly with the grate element.
  • the part of the girder means in the first system of ducts can be formed of two separate chambers in the gir- der means, or pipes which are laid in or cast into the girder means. Whatever solution may be selected, this part of the system of ducts is well protected and allows a simple connection to the shaft assembly.
  • the inlet and/or outlet of the shaft assembly can be connected to an outer cooling coil by means of a rotary connection.
  • the inlet and/or outlet of the shaft assembly is/are preferably connected to the outer cooling coil by means of a flexible tube.
  • Fig. 1 is a longitudinal cross-sectional view showing a part of an inventive grate device from the side;
  • Fig. 2 is a longitudinal cross-sectional view showing an alternative connection means from the side;
  • Fig. 3 is an end view along the line A-A in Fig. 1 indicating some details by dashed lines;
  • Fig. 4 is a cross-sectional view, along the line E-E in Fig. 1, of the girder means in section;
  • Fig. 5 is a cross-sectional view of the girder means along the line B-B, schematically showing a grate plate element arranged on the same;
  • Fig. 6 is a view corresponding to Fig. 1 and showing an alternative embodiment
  • Fig. 7 is an end view along the line A-A in Fig. 6, indicating some details by dashed lines;
  • Fig. 8 is a view corresponding to Fig. 5 along the line B-B in Fig. 6;
  • Fig. 9 is a view corresponding to Fig. 1 and showing a third embodiment of the invention;
  • Fig. 10 is an end view along the line A-A in Fig. 9 indicating some concealed details by dashed lines;
  • Fig. 11 is a view corresponding to Fig. 5 along the line B-B in Fig. 9 ;
  • Fig. 12 is a cross-sectional view of several co- acting grate elements according to Fig. 11;
  • Fig. 13 is an end view illustrating how an outer cooling coil can be connected to the inventive grate device .
  • the grate device 1 in Fig. 1 comprises a grate element 2 and a turnable shaft assembly 3 connected thereto and constitutes a part of a combustion furnace having a combustion chamber 4.
  • refuse for instance, can be burnt by supplying combustion air both from the underside (primary air) and from above (secondary air) .
  • the grate element 2 comprises according to the invention at least one plate element 5, which is pivotably supported by a girder means 6.
  • a plurality of plate means 5 can be arranged on the girder means 6.
  • the plate element 5 there is a tubular coil 7, which is connected to a chamber 10 in the girder means 6 by means of connecting pipes, of which only the pipe 8 is shown in Fig. 1, and an aperture 9 communicating with the pipe 8.
  • the girder means 6 has an aperture 11, which communicates with the chamber 10.
  • the shaft assembly 3 is arranged outside the combustion chamber 4 and thus not exposed to the high temperatures which may occur therein.
  • the shaft assembly comprises a central inner pipe 12, which is enclosed by an outer pipe 13.
  • the inner pipe 12 forms an inlet 14 for cooling water
  • a space 15 between the inner pipe 12 and the outer pipe 13 forms an outlet 16 for cooling water.
  • the inlet 14 and the outlet 16 are connected with the girder means 6 through separate lateral ducts 18, 19, which are indicated in Fig. 1 by dashed lines and which are formed in an end portion 20 of the shaft assembly 3.
  • the shaft assembly 3 is connected with a rotary connection 21, which allows the coupling of the inlet 14 and the outlet 16 to an outer cooling coil which is generally designated 22.
  • a rotary connection 21 which allows the coupling of the inlet 14 and the outlet 16 to an outer cooling coil which is generally designated 22.
  • a tube coupling 23 of the type shown in Fig. 2, instead of the rotary connection.
  • Fig. 3 shows the end portion 20 of the shaft assembly 3 seen from the combustion chamber 4, some concealed details being indicated by dashed lines. In Fig. 3, it is possible to clearly distinguish the inner pipe 12, the outer pipe 13, the space 15 between the pipes and said lateral ducts 18, 19.
  • Fig. 4 shows the girder means 6 with the duct 10 formed therein and the aperture 11 communicating with the lateral duct 18 of the shaft assembly 3. Moreover, this figure shows the second chamber 24 of the girder means 6 and its aperture 25 communicating with the lateral duct 19 of the shaft assembly 3.
  • Fig. 5 illustrates the grate element 2, the girder means 6 being shown in cross-section and the plate element 5 supported by the same in a schematic view. It clearly appears from the figure that the chambers 10, 24 of the girder means 6 are connected to the tubular coil 7 in the plate element 5 by means of pipe bends 26, 27 and connecting pipes 8, 28.
  • the girder means 6, instead of the chambers 10, 24, comprises pipes 29, 30 which are laid in borings 31, 32 in the upper portion 33 of the girder means 6 but which could also be cast into the same.
  • the pipes 29, 30 are used directly for the transition to the lateral ducts 18, 19 of the shaft assembly 6, which according to Fig. 7 also end at a somewhat greater distance from each other than in Fig. 3, due to the fact that the pipes 29, 30 are placed at a greater distance from each other than the apertures 11, 25 of the chambers 10, 24.
  • Figs 9, 10 and 11 show a further grate device 1, which to a great extent corresponds to the one shown in Figs 1, 3, 4 and 5. Therefore, also in this case, use is made of corresponding reference numerals and only the differences in relation to the embodiment which was first described are stated.
  • the girder means 6, instead of the chambers 10, 24, comprises pipes 34, 35 which are laid in grooves 36, 37 in the upper portion 38 of the girder means 6.
  • the pipes 34, 35 are used directly for the transition to the lateral ducts 18, 19 of the shaft assembly 3, which also, according to Fig. 10, end at a somewhat greater distance from each other than in Fig.
  • Fig. 12 illustrates, by means of a plurality of grate elements 2 according to Figs 9-11, how the grate elements 2 are intended to co-operate. It is apparent from the figure that the grate elements 2 are pivotable in a limited manner in opposite directions, thereby displacing the material (not shown) which is placed on the grate elements 2 and intended for combustion. It will be understood that such a limited pivoting does not require the use of a relatively expensive and sensitive rotary connection, a tube coupling 23 of the type shown in Fig. 2 therefore being perfectly usable.
  • Fig. 13 shows a possible arrangement with a tube coupling 23 according to Fig. 2, seen from the inlet and outlet end of the shaft assembly 3. It clearly appears from this figure how tubes 39, which are connected to a plurality of inventive grate devices, take different positions according to the pivoting position of the associ- ated grate device (cf . Fig. 12) . It also clearly appears from the figure how the connection to the above-mentioned outer cooling coil 22 can be designed.
  • the invention can be modified in various ways within the scope of the claims.
  • grate elements of another type than the one illustrated herein i.e. for example to different types of plate-shaped grate elements, such as cast or welded grate elements divided into several units and connected in series or in parallel.
  • the inlet and the outlet of the shaft assembly can be arranged on each side of a grate element seen in the axial direction, the inlet suitably being formed of an inner pipe in the shaft assembly on one side of the grate element and the outlet suitably be- ing formed of an inner pipe in the shaft assembly on the other side of the grate element.
  • inventive grate devices which can co-operate, for instance, as the grate devices according to said US A-4,981,090, are mounted together in a combustion furnace.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Gasification And Melting Of Waste (AREA)

Abstract

L'invention concerne une grille (1) destinée à un four à combustion et comprenant un élément de grille (2) auquel est relié un ensemble arbre (3) rotatif. L'élément de grille (2) comprend un premier (17.1) système de conduits destinés à faire circuler un liquide de refroidissement dans l'élément de grille (2). L'ensemble arbre (3) comprend un deuxième (17.2) système de conduits communiquant avec le premier système de conduits et formant un orifice d'admission et de sortie (14, 16) de liquide de refroidissement. L'élément de grille (2) comprend un support (6) relié non rotatif à l'ensemble arbre (3) et contenant une partie du premier (17.1) système de conduits qui communique avec le deuxième (17.2) système de conduits. L'élément de grille (2) comprend une plaque (5) montée sur le support (6) et formant une zone de grille par laquelle passe la partie restante (7) du premier système de conduits pour refroidir la zone de grille.
PCT/IB1999/000936 1998-05-29 1999-05-25 Grille a tubes refroidis par l'eau destine a un four a combustion Ceased WO1999063270A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69910783T DE69910783T8 (de) 1998-05-29 1999-05-25 Wassergekühlter rost für brennanlage
EP99919478A EP1092114B1 (fr) 1998-05-29 1999-05-25 Grille a tubes refroidis par l'eau destinee a un four a combustion
AT99919478T ATE248323T1 (de) 1998-05-29 1999-05-25 Wassergekühlter rost für brennanlage
AU37253/99A AU3725399A (en) 1998-05-29 1999-05-25 Water-cooled grate for a combustion furnace
DK99919478T DK1092114T3 (da) 1998-05-29 1999-05-25 Vandkølet rist til en forbrændingsovn

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9801905-2 1998-05-29
SE9801905A SE512432C2 (sv) 1998-05-29 1998-05-29 Vattenkyld rost för förbränningsugn

Publications (1)

Publication Number Publication Date
WO1999063270A1 true WO1999063270A1 (fr) 1999-12-09

Family

ID=20411508

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/000936 Ceased WO1999063270A1 (fr) 1998-05-29 1999-05-25 Grille a tubes refroidis par l'eau destine a un four a combustion

Country Status (7)

Country Link
EP (1) EP1092114B1 (fr)
AT (1) ATE248323T1 (fr)
AU (1) AU3725399A (fr)
DE (1) DE69910783T8 (fr)
DK (1) DK1092114T3 (fr)
SE (1) SE512432C2 (fr)
WO (1) WO1999063270A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009023977A3 (fr) * 2007-08-22 2009-06-18 Doikos Investments Ltd Plaque de grill à refroidissement par un liquide, présentant des plaques d'usure, et grill à gradins formé de telles plaques de grill
WO2018007854A1 (fr) 2016-07-07 2018-01-11 Babcock & Wilcox Vølund A/S Grille mobile pour four
EP4027091A1 (fr) 2021-01-08 2022-07-13 Babcock & Wilcox Vølund A/S Élément de grille à plaques pour une grille mobile d'un four

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US916609A (en) * 1908-03-06 1909-03-30 Peter G Schmidt Water-cooled grate-bar.
FR430212A (fr) * 1910-05-07 1911-10-11 Alfred Eduard Hofmann Foyer industriel
US4596233A (en) * 1981-10-16 1986-06-24 Coal Industry (Patents) Limited Solid fuel combustion equipment
WO1996029544A1 (fr) * 1995-03-23 1996-09-26 Theodor Koch Grille de combustion et procede d'optimisation du fonctionnement d'une grille de combustion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US916609A (en) * 1908-03-06 1909-03-30 Peter G Schmidt Water-cooled grate-bar.
FR430212A (fr) * 1910-05-07 1911-10-11 Alfred Eduard Hofmann Foyer industriel
US4596233A (en) * 1981-10-16 1986-06-24 Coal Industry (Patents) Limited Solid fuel combustion equipment
WO1996029544A1 (fr) * 1995-03-23 1996-09-26 Theodor Koch Grille de combustion et procede d'optimisation du fonctionnement d'une grille de combustion

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009023977A3 (fr) * 2007-08-22 2009-06-18 Doikos Investments Ltd Plaque de grill à refroidissement par un liquide, présentant des plaques d'usure, et grill à gradins formé de telles plaques de grill
EA016515B1 (ru) * 2007-08-22 2012-05-30 Доикос Инвестмент Лимитед Элемент ступенчатой колосниковой решетки с жидкостным охлаждением и состоящая из таких элементов ступенчатая колосниковая решетка
US8590465B2 (en) 2007-08-22 2013-11-26 Doikos Investments Ltd. Liquid-cooled grill plate comprising wear plates and stepped grill made of such grill plates
WO2018007854A1 (fr) 2016-07-07 2018-01-11 Babcock & Wilcox Vølund A/S Grille mobile pour four
CN109563992A (zh) * 2016-07-07 2019-04-02 巴布科克·威尔科克斯沃伦德有限公司 用于炉子的可移动炉篦
US10746401B2 (en) 2016-07-07 2020-08-18 Babcock & Wilcox Vølund A/S Movable grate for a furnace
CN109563992B (zh) * 2016-07-07 2020-09-01 巴布科克·威尔科克斯沃伦德有限公司 用于炉子的可移动炉篦
EP4027091A1 (fr) 2021-01-08 2022-07-13 Babcock & Wilcox Vølund A/S Élément de grille à plaques pour une grille mobile d'un four
WO2022148630A1 (fr) 2021-01-08 2022-07-14 Babcock & Wilcox Vølund A/S Élément de grille en forme de plaque pour grille mobile d'un four

Also Published As

Publication number Publication date
SE9801905D0 (sv) 1998-05-29
DE69910783T2 (de) 2004-06-17
DE69910783D1 (de) 2003-10-02
EP1092114A1 (fr) 2001-04-18
DE69910783T8 (de) 2004-11-11
AU3725399A (en) 1999-12-20
ATE248323T1 (de) 2003-09-15
DK1092114T3 (da) 2003-10-20
EP1092114B1 (fr) 2003-08-27
SE9801905L (sv) 1999-11-30
SE512432C2 (sv) 2000-03-13

Similar Documents

Publication Publication Date Title
US4637034A (en) Cooling panel for electric arc furnace
US5913274A (en) Incineration grate with internal cooling
US5362230A (en) Rolls for high temperature roller hearth furnaces
BRPI0509990B1 (pt) Sistema trocador de calor usado na confeção do aço
CA1121422A (fr) Dome de four a arc
HU220436B (hu) Folyadékkal hűtött rostélylap
US6059028A (en) Continuously operating liquid-cooled panel
AU2003250046B2 (en) Cooling plate for metallurgic furnaces
CA2022276C (fr) Element refroidisseur pour haut-fourneau
EP1092114B1 (fr) Grille a tubes refroidis par l'eau destinee a un four a combustion
US4647436A (en) Reaction tube system for a steam reformer
US3963223A (en) Metallurgical vessel, in particular a converter
AU2001289934B2 (en) Cooling element for shaft furnaces
JPH10500203A (ja) プレート型熱交換器
US4435814A (en) Electric furnace having liquid-cooled vessel walls
US20060150874A1 (en) Furnace wall structure
KR20000017377A (ko) 소각 설비용 화격자
US4237854A (en) Damper construction and a method of cooling a damper
CA1223727A (fr) Systeme caloporteur per eau circulant a tres haute vitesse
EP0390814B1 (fr) Chambre de combustion avec une grille mobile
CN213362514U (zh) 一种双冷却通道的螺旋出渣机
JPS625082A (ja) ア−ク炉用冷却パネル
US20070006786A1 (en) Roller grate
SU1086017A1 (ru) Охлаждаема футеровка металлургической печи
JPH0422966B2 (fr)

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AT AU AZ BA BB BG BR BY CA CH CN CU CZ CZ DE DE DK DK EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
NENP Non-entry into the national phase

Ref country code: KR

WWE Wipo information: entry into national phase

Ref document number: 1999919478

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: 1999919478

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1999919478

Country of ref document: EP