EP4361500A1 - Élément de limitation de la bande de grille pour une grille de combustion - Google Patents

Élément de limitation de la bande de grille pour une grille de combustion Download PDF

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Publication number
EP4361500A1
EP4361500A1 EP22203864.8A EP22203864A EP4361500A1 EP 4361500 A1 EP4361500 A1 EP 4361500A1 EP 22203864 A EP22203864 A EP 22203864A EP 4361500 A1 EP4361500 A1 EP 4361500A1
Authority
EP
European Patent Office
Prior art keywords
grate
channel
cover
designed
combustion
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.)
Pending
Application number
EP22203864.8A
Other languages
German (de)
English (en)
Inventor
Werner Brennwald
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
Hitachi Zosen Innova AG
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 Hitachi Zosen Innova AG filed Critical Hitachi Zosen Innova AG
Priority to EP22203864.8A priority Critical patent/EP4361500A1/fr
Priority to PCT/EP2023/079457 priority patent/WO2024088955A1/fr
Publication of EP4361500A1 publication Critical patent/EP4361500A1/fr
Pending 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
    • 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
    • F23H17/08—Bearers; Frames; Spacers; Supports
    • F23H17/10—Dead plates; Imperforate fuel supports

Definitions

  • the present invention relates to a grate path delimitation element for a combustion grate for incinerating waste and to a combustion grate comprising at least one such grate path delimitation element.
  • combustion grates for the large-scale incineration of waste have been known to experts for a long time.
  • Such combustion grates can be in the form of pusher combustion grates, for example, which include moving parts to carry out stoking strokes.
  • the fuel is conveyed in the transport direction from an inlet end of the combustion grate to an outlet end and is burned in the process.
  • appropriate air inlets are provided through the combustion grate, through which the air - also known as primary air - is introduced.
  • a frequently used combustion grate is the so-called stepped grate.
  • This comprises grate blocks arranged next to one another, each of which forms a row of grate blocks.
  • the rows of grate blocks are arranged one above the other in a stepped manner, whereby in the case of so-called pusher grates, the front end of a grate block, viewed in the push direction, rests on a support surface of the adjacent (underlying) grate block in the transport direction and is moved on this support surface with the corresponding push movement.
  • the grate blocks Due to the high temperatures during combustion and in the combustion chamber, the grate blocks are also exposed to very high thermal stress.
  • the thermal stress promotes erosion through abrasion and chemical reactions taking place on the contact surface, which further damage the contact surface. All of this ultimately leads to a shortening of the service life of the grate block.
  • the grate bars are normally cooled with a coolant or cooling fluid from below, i.e. on the side of the combustion grate opposite the combustion.
  • a coolant or cooling fluid from below, i.e. on the side of the combustion grate opposite the combustion.
  • Water or air is usually used as a coolant, which is why grate blocks are often referred to as air- or water-cooled.
  • the individual grate tracks are arranged in such a way that they can expand at least on one long side. This expansion can lead to problems if parts are deformed and/or gaps are created through which uncontrolled primary air enters the combustion chamber. This primary air promotes uncontrolled combustion, which further increases the thermal load.
  • Grate track separation also known as center beam.
  • the WO 2018/149516 A1 discloses a grate track separation element which is designed as a one-piece cast part. Due to the design as a one-piece element, the grate track separation element can only partially accommodate the lateral expansion of the grate tracks, which can cause the gaps mentioned above and, as a result, primary air can enter the combustion chamber unintentionally.
  • the invention relates to a grate path limiting element for a combustion grate for incinerating waste.
  • the grate path limiting element comprises a channel element and a channel cover for covering the channel element.
  • the channel cover comprises at least one cover element and a closing element with a locking device.
  • the closing element comprises a support surface facing away from the channel element and a first engagement element directed towards the cover element.
  • the cover element comprises a A support surface facing away from the channel element, a retaining element directed towards the channel element, a second engagement element directed towards the closing element and designed to receive the first engagement element, and a recess directed towards the closing element for receiving the locking device of the closing element.
  • the locking device is designed in such a way that it releasably locks the closing element in the channel element.
  • engaging element is understood to mean an element which engages in another element or which is engaged by another element. Accordingly, both a nose and a recess for this nose are referred to as engaging elements.
  • the grate track limiting element according to the invention has the advantage over the solutions from the prior art that the expansion of the grate tracks is compensated by compressing the channel element. This leads to a better seal of the entire construction and accordingly to less uncontrolled inflow of primary air into the combustion chamber.
  • a construction in the sense of WO 2018/149516 A1 with a fixed cover does not lead to the same improved tightness, since the expansion of the grate tracks can be compensated less effectively due to the lower elasticity of the «one-piece» channel element.
  • the channel cover comprises a second cover element, which is preferably designed the same as the first cover element.
  • a middle ground between the number of individual parts to be assembled and the weight of the individual parts to be assembled.
  • either the cover elements are relatively heavy or the effort required to fix the end elements is complex.
  • the heavy cover elements which therefore cover a larger area of the duct element, two fitters are required to place the cover element together on the duct element.
  • the effort required to fix the end elements should not be underestimated. Therefore, a sequence of two preferably identically designed cover elements is preferably fixed with one end element, which makes the individual parts lighter and therefore easier to assemble and the number of end elements is reduced, which reduces the effort required to fix them.
  • the first engagement element is designed as a projection and the second engagement element as a recess.
  • the engagement elements can be designed both as a projection and as a recess for receiving the projection.
  • the cover element comprises an engagement element designed as a recess and the cover element comprises an engagement element designed as a projection (also known as a nose), which is designed to match the recess of the cover element.
  • the closure element comprises two mutually opposite Engagement elements formed as projections, which each engage in the recesses of the cover elements.
  • This design achieves an improved fixation of the channel cover in the channel element, which increases the tightness of the grate track limitation element.
  • the channel element comprises an opening directed towards the channel cover for receiving the retaining element of the cover element.
  • the opening is designed as a groove with incisions and is narrower than the width of the retaining element. The incisions are wider than the width of the retaining element of the cover element.
  • a groove with incisions is understood to mean an elongated opening parallel to the longitudinal axis of the channel element, which has local widenings (incisions) that are wider than the groove.
  • the cover elements and the end elements can be inserted into the channel element at the location of the cuts and then pushed to the final installation location.
  • This design enables simplified installation and removal of the cover elements and end elements without reducing their sealing ability.
  • the channel element comprises a cooling fluid channel with a cooling fluid inlet opening and a cooling fluid outlet opening.
  • a fluid channel or using the channel element as a fluid channel it can be cooled, which reduces the wear of the grate track limiting element and thus increases its service life.
  • the opening of the channel element directed towards the channel cover extends into the fluid channel.
  • the grate path limiting element comprises a sealing element attached to the side of the wall of the channel element. This sealing element further increases the tightness of the grate and reduces the uncontrolled inflow of primary air to the combustion chamber.
  • the moving grates usually comprise movable and non-movable grate blocks, which are arranged in rows of movable and non-movable grate blocks. While the non-movable grate block rows compress the grate path limiting element through thermal expansion, this is not the case to the same extent with the movable grate block rows, since these still have to remain movable. It is therefore preferred that a sealing element is attached to the grate path limiting element above the contact point of the grate blocks, and particularly preferably this is attached only above the movable grate blocks.
  • the support surface of the cover element facing away from the channel element and the support surface of the end element facing away from the channel element are gable roof or mansard gable roof shape, preferably with rounded edges.
  • gable roof-shaped is understood to mean a shape that resembles a gable roof. That is, a shape in which a roof surface slopes down on both sides of a gable oriented in the longitudinal direction.
  • a mansard gable roof-shaped is understood to mean a special form of gable roof in which the roof surface sloping down from the gable does not extend as a flat plane, but is divided into several levels that have different inclinations.
  • support surface of the cover element and the end element facing away from the channel element are a semicircular shape, an elliptical shape or a flat plane.
  • the above-mentioned preferred embodiments of the support surface have proven to be particularly efficient in the transport and distribution of fuel on the combustion grate, so that no fuel remains on the grate path delimitation element.
  • the locking device is designed as a clamp, wherein the clamp is particularly preferably arranged between the support surface of the end element and the channel element.
  • This preferred embodiment of the locking device allows for easy installation and removal, while maintaining high stability of the fixation, so that the End element can be securely fixed, but is also easy to assemble and disassemble.
  • the arrangement of the clamp below the support surface protects the clamp from direct contact with the firing material, which means that it is not blocked or stuck by the firing material and is therefore easy to assemble and disassemble.
  • the support surface of the cover element facing away from the channel element and the support surface of the end element facing away from the channel element are designed in the shape of a pent roof.
  • the term "pent roof-shaped” is understood to mean a shape that resembles a pent roof.
  • one side of the roof slopes down from the gable at an angle of between 10 - 80°, while the other opposite side of the roof slopes down vertically or almost vertically.
  • This embodiment is preferred if the grate path delimitation element extends along the wall of the combustion chamber.
  • a pent roof-shaped support surface has the advantage that fuel does not remain on the sides, preferably not on the side walls of the combustion chamber, which could lead to uncontrolled combustion.
  • the locking device comprises a plate and a bolt that fixes the plate in the end element.
  • a plate and a bolt that fixes the plate in the end element.
  • the invention further relates to a combustion grate comprising at least two grate tracks and a grate track limiting element arranged between the grate tracks as described above.
  • the combustion grate according to the invention has, as described above, the advantage that the inflow of controlled combustion air into the combustion chamber is prevented.
  • the invention further relates to a combustion grate comprising at least one grate track and a grate track delimiting element as described above arranged between the grate track and a side wall of a combustion chamber of an incineration plant.
  • the combustion grate according to the invention has the advantage that the inflow of controlled combustion air into the combustion chamber is prevented and no combustible material remains along the side walls.
  • the invention further relates to an incineration plant for the thermal treatment of waste comprising one or more combustion grates as described above.
  • the incineration plant according to the invention has the advantage that the inflow of controlled combustion air into the combustion chamber is prevented, whereby the incineration of waste can take place more efficiently and the plant requires less maintenance.
  • the illustrated combustion chamber 1 of an incineration plant comprises a side wall 3, a combustion grate 5 comprising an air-cooled grate track 7 and a water-cooled grate track 9.
  • the combustion grate 5 further comprises two grate track delimitation elements 11, 13.
  • the Figure 2 shows the combustion grate 5 comprising the air-cooled grate track 7, the water-cooled grate track 9 and the grate track limiting element 11 arranged between the two grate tracks.
  • the Figure 3 shows the grate track limitation element 11 comprising a channel element 15, a channel cover 17 and a sealing element 19.
  • the Figure 4 shows the grate track limiting element 11 with raised channel cover 17.
  • the channel cover 17 consists of two cover elements 21, 23 and a closing element 25.
  • the channel element 15 comprises a Groove 27 extending in the longitudinal direction of the channel element 15, which has incisions 29.
  • the Figure 5 shows a detailed view of the channel cover 17 comprising the cover elements 21, 23 and the end element 25.
  • the cover elements 21, 23 comprise retaining elements 31, 32, which are located on the side of the cover elements 21, 23 facing the channel element 15.
  • the cover elements 21, 23 On the side facing away from the channel element 15, the cover elements 21, 23 have support surfaces 33, 35 on which the firing material rests.
  • the support surfaces 33, 35 are designed in the shape of a mansard gable roof with rounded edges.
  • the cover elements 21, 23 also have engagement elements 37, 39, which are designed as recesses here.
  • the engagement elements 37, 39 are oriented in the direction of the end element 25.
  • the cover elements 21, 23 each have a recess 41, 43 (the recess 43 is not visible in this figure for the cover element 23).
  • the recess 41 serves to accommodate a locking device (as will be described later).
  • the Figure 5 further shows a closing element 25 with a support surface 45 and two engagement elements 47, 49, which are designed as projections.
  • the closing element 25 also comprises a locking device 51, which is designed as a clamp.
  • the Figure 6 shows a bottom view of the cover elements 21, 23 comprising the retaining elements 31, 32, the recesses 41, 43 and the engagement element 39 (the engagement element 37 is not visible).
  • the Figure 7 shows a bottom view of the end element 25 with the engagement element 47 and the locking device 49.
  • the Figure 8 shows a detailed view of the combustion plant comprising the side wall 3, the combustion grate 5 with the air-cooled grate track 7 and the grate track limiting element 13 arranged between the side wall 3 and the grate track 7.
  • the Figure 9 shows a longitudinal section through the incineration plant of the Figure 8 with the side wall 3, the combustion grate 5, the air-cooled grate track 7 and the grate track limitation element 13 arranged between the side wall 3 and the grate track 7.
  • the Figure 10 shows a detailed view of the grate track limitation element 13 comprising the channel element 15 with the sealing element 19 attached to the side and the channel cover 17 comprising the cover elements 21, 23 and the closing element 25.
  • the Figure 11 shows a detailed view of the channel cover 17 with the cover elements 21, 23 and the end element 25.
  • the support surfaces 33, 35 of the cover elements 21, 23 are designed in the shape of a pent roof with rounded edges.
  • the cover elements 21, 23 have the retaining elements 31, 32 on the side facing the channel element 15.
  • the cover elements 21, 23 comprise the engagement elements 37, 39 on the side facing the end element 25, which are designed here as recesses.
  • the cover elements 21, 23 also comprise the recesses 41, 43 (the recess 41 is not visible) for receiving the locking device 49.
  • the Figure 11 shows further the end element 25 with the locking device 49, which is designed here as a plate with bolts.
  • the Figure 12 shows a detailed view of the transition from the grate path limiting element 13 to the combustion grate 5.
  • the channel element 15 comprises sealing elements 19 attached to the side of the channel element 15.
  • the sealing elements 19 are attached above a row of movable grate blocks 51, which move back and forth on sliding surfaces 53 of immovable grate blocks 55.
  • the sealing element 19 closes a gap (not shown) that is created when the combustion grate 5 contracts, through which primary air could enter the combustion chamber in an uncontrolled manner.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
EP22203864.8A 2022-10-26 2022-10-26 Élément de limitation de la bande de grille pour une grille de combustion Pending EP4361500A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22203864.8A EP4361500A1 (fr) 2022-10-26 2022-10-26 Élément de limitation de la bande de grille pour une grille de combustion
PCT/EP2023/079457 WO2024088955A1 (fr) 2022-10-26 2023-10-23 Élément de bordure de ligne de grille pour une grille de combustion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22203864.8A EP4361500A1 (fr) 2022-10-26 2022-10-26 Élément de limitation de la bande de grille pour une grille de combustion

Publications (1)

Publication Number Publication Date
EP4361500A1 true EP4361500A1 (fr) 2024-05-01

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ID=84358580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22203864.8A Pending EP4361500A1 (fr) 2022-10-26 2022-10-26 Élément de limitation de la bande de grille pour une grille de combustion

Country Status (2)

Country Link
EP (1) EP4361500A1 (fr)
WO (1) WO2024088955A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004072A2 (fr) * 1978-03-07 1979-09-19 Josef Martin Feuerungsbau GmbH Grille, notamment pour foyers de grandes dimensions
DE69105120T2 (de) * 1990-04-23 1995-05-11 Tiru Traite Ind Residus Urbain Balken, der eine Dehnungsfuge zwischen nebeneinanderliegenden Zonen eines Rostes bildet, dessen Stäbe abwechselnd fest und beweglich sind.
WO2018149516A1 (fr) 2017-02-17 2018-08-23 Mitsubishi Hitachi Power Systems Europe Gmbh Grille d'avance dotée d'éléments de séparation de voies de grille
KR20200013957A (ko) * 2018-07-31 2020-02-10 (주)이에스 고형연료 소각로

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004072A2 (fr) * 1978-03-07 1979-09-19 Josef Martin Feuerungsbau GmbH Grille, notamment pour foyers de grandes dimensions
DE69105120T2 (de) * 1990-04-23 1995-05-11 Tiru Traite Ind Residus Urbain Balken, der eine Dehnungsfuge zwischen nebeneinanderliegenden Zonen eines Rostes bildet, dessen Stäbe abwechselnd fest und beweglich sind.
WO2018149516A1 (fr) 2017-02-17 2018-08-23 Mitsubishi Hitachi Power Systems Europe Gmbh Grille d'avance dotée d'éléments de séparation de voies de grille
KR20200013957A (ko) * 2018-07-31 2020-02-10 (주)이에스 고형연료 소각로

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WO2024088955A1 (fr) 2024-05-02

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