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EP1092114B1 - Grille a tubes refroidis par l'eau destinee a un four a combustion - Google Patents

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

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Publication number
EP1092114B1
EP1092114B1 EP99919478A EP99919478A EP1092114B1 EP 1092114 B1 EP1092114 B1 EP 1092114B1 EP 99919478 A EP99919478 A EP 99919478A EP 99919478 A EP99919478 A EP 99919478A EP 1092114 B1 EP1092114 B1 EP 1092114B1
Authority
EP
European Patent Office
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.)
Expired - Lifetime
Application number
EP99919478A
Other languages
German (de)
English (en)
Other versions
EP1092114A1 (fr
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.)
Babcock and Wilcox Volund 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
Publication of EP1092114A1 publication Critical patent/EP1092114A1/fr
Application granted granted Critical
Publication of EP1092114B1 publication Critical patent/EP1092114B1/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
    • 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 and from WO 9629544.
  • 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. Because of the above-mentioned slots between the individual grate elements, it is not, however, possible to eliminate the risk of heated combustion material and especially melted metal or glass passing such a slot when refuse is being burnt and damaging a coolant tube connected under a grate element. Thus it will be understood that a solution involving flexible tubes, which are arranged in a combustion chamber, is not satisfactory.
  • 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 replaceable 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 conduit, 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 girder 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. Since the rotary connection or the tube does not, thanks to the invention, need to be arranged directly under the combustion chamber, thus avoiding the high temperatures present in the same, it will be understood that also such simple construction elements as flexible tubes very well can be used when the shaft assembly only needs to perform a limited turning movement to pivot the associated grate element.
  • 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 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.
  • Figs 6, 7, and 8 show a grate device 1 which to a great extent corresponds to the one shown in Figs 1, 3, 4 and 5. Therefore corresponding reference numerals are used and only the differences in relation to the above embodiment are described.
  • 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. 3, due to the fact that the pipes 34, 35 are placed at a greater distance from each other than the apertures 11, 25 of the chambers 10, 24.
  • 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 associated 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.
  • 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 being 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)
  • Gasification And Melting Of Waste (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Claims (8)

  1. Dispositif à grille pour un four à combustion, ledit dispositif comprenant un élément formant grille (2) ainsi qu'un ensemble de transmission tournant (3) relié à celui-ci, l'élément formant grille (2) ayant un premier système de conduites (17.1) pour la circulation d'un liquide de refroidissement à travers l'élément formant grille (2), l'ensemble de transmission (3) ayant un second système de conduites (17.2), qui communique avec le premier système de conduites et forme une entrée et une sortie pour le liquide de refroidissement (14, 16), et l'élément formant grille (2) comprenant des moyens formant poutrelle (6) reliés de façon non rotative à l'ensemble de transmission (3), moyennant quoi les moyens formant poutrelle (6) comportent une partie du premier système de conduites (17.1) laquelle communique avec le second système de conduites (17.2), et l'élément formant grille (2) comporte des moyens formant plateau (5), fixés sur les moyens formant poutrelle (6) et formant une zone de grille et à travers laquelle la partie restante (7) du premier système de conduites s'étend pour refroidir la zone de grille.
  2. Dispositif selon la revendication 1, caractérisé en ce que le second système de conduites (17.2) comprend un conduit d'alimentation et de retour, dont au moins un est formé d'un tuyau interne (12) qui est concentrique avec l'axe de l'ensemble de transmission.
  3. Dispositif selon la revendication 2, caractérisé en ce que le second conduit de retour est formé d'un tuyau externe (13) sur l'extérieur du tuyau interne (12).
  4. Dispositif selon la revendication 3, caractérisé en ce que le tuyau externe (13) comprend une partie d'extrémité (20) reliée de façon non rotative à l'élément formant grille (2) et à travers laquelle s'étendent les conduites latérales (18, 19), qui sont reliées au conduit d'alimentation et de retour et qui forment la liaison du second système de conduites (17.2) avec le premier système de conduites (17.1).
  5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une partie du premier système de conduites (17.1) est formée de deux chambres séparées (10, 24) dans les moyens formant poutrelle (6).
  6. Dispositif selon la revendication 5 caractérisé en ce que ladite partie est formée de tuyaux (29, 30, 34, 35) placés ou coulés dans les moyens formant poutrelle (6).
  7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'entrée et/ou la sortie (14, 16) est/sont reliée (a) à un serpentin de refroidissement externe (22) par l'intermédiaire d'une liaison rotative (21).
  8. Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que l'entrée et/ou la sortie (14, 16) est/sont reliée (s) à un serpentin de refroidissement externe (22) par l'intermédiaire d'un tube souple (39).
EP99919478A 1998-05-29 1999-05-25 Grille a tubes refroidis par l'eau destinee a un four a combustion Expired - Lifetime EP1092114B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9801905 1998-05-29
SE9801905A SE512432C2 (sv) 1998-05-29 1998-05-29 Vattenkyld rost för förbränningsugn
PCT/IB1999/000936 WO1999063270A1 (fr) 1998-05-29 1999-05-25 Grille a tubes refroidis par l'eau destine a un four a combustion

Publications (2)

Publication Number Publication Date
EP1092114A1 EP1092114A1 (fr) 2001-04-18
EP1092114B1 true EP1092114B1 (fr) 2003-08-27

Family

ID=20411508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99919478A Expired - Lifetime EP1092114B1 (fr) 1998-05-29 1999-05-25 Grille a tubes refroidis par l'eau destinee 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4275008A1 (fr) * 2021-01-08 2023-11-15 Babcock & Wilcox Vølund A/S Élément de grille en forme de plaque pour grille mobile d'un four

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH701280B1 (de) * 2007-08-22 2010-12-31 Doikos Investments Ltd Flüssigkeitsgekühlte Rostplatte mit Verschleissplatten und aus solchen Rostplatten bestehender Stufenrost.
US10746401B2 (en) 2016-07-07 2020-08-18 Babcock & Wilcox Vølund A/S Movable grate for a furnace

Family Cites Families (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
DE3263556D1 (en) * 1981-10-16 1985-06-20 Coal Industry Patents Ltd Grate assembly in solid fuel combustion equipments
ATE184694T1 (de) * 1995-03-23 1999-10-15 Theodor Koch Verbrennungsrost und verfahren zum optimieren des betriebes eines verbrennungsrostes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4275008A1 (fr) * 2021-01-08 2023-11-15 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
DE69910783D1 (de) 2003-10-02
WO1999063270A1 (fr) 1999-12-09
SE9801905D0 (sv) 1998-05-29
DE69910783T2 (de) 2004-06-17
ATE248323T1 (de) 2003-09-15
SE512432C2 (sv) 2000-03-13
DK1092114T3 (da) 2003-10-20
EP1092114A1 (fr) 2001-04-18
SE9801905L (sv) 1999-11-30
DE69910783T8 (de) 2004-11-11
AU3725399A (en) 1999-12-20

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