EP0919771A2 - Procédé de combustion pour matières solides sur une grille coulissante refroidie par eau, ainsi que barreau de grille et grille pour la mise en oeuvre du procédé - Google Patents

Procédé de combustion pour matières solides sur une grille coulissante refroidie par eau, ainsi que barreau de grille et grille pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0919771A2
EP0919771A2 EP98810971A EP98810971A EP0919771A2 EP 0919771 A2 EP0919771 A2 EP 0919771A2 EP 98810971 A EP98810971 A EP 98810971A EP 98810971 A EP98810971 A EP 98810971A EP 0919771 A2 EP0919771 A2 EP 0919771A2
Authority
EP
European Patent Office
Prior art keywords
grate
primary air
combustion
grate plate
mouths
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
EP98810971A
Other languages
German (de)
English (en)
Other versions
EP0919771B1 (fr
EP0919771A3 (fr
Inventor
Jakob Stiefel
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.)
Doikos Investments Ltd
Original Assignee
Doikos Investments Ltd
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 Doikos Investments Ltd filed Critical Doikos Investments Ltd
Publication of EP0919771A2 publication Critical patent/EP0919771A2/fr
Publication of EP0919771A3 publication Critical patent/EP0919771A3/fr
Application granted granted Critical
Publication of EP0919771B1 publication Critical patent/EP0919771B1/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
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/002—Incineration of waste; Incinerator constructions; Details, accessories or control therefor characterised by their grates
    • 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
    • F23H1/00—Grates with solid bars
    • F23H1/02—Grates with solid bars having provision for air supply or air preheating, e.g. air-supply or blast fittings which form a part of the grate structure or serve as supports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H11/00—Travelling-grates
    • F23H11/12—Travelling-grates inclined travelling grates; Stepped travelling grates
    • 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
    • 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
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • F23L1/02—Passages or apertures for delivering primary air for combustion  by discharging the air below the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H2700/00—Grates characterised by special features or applications
    • F23H2700/009—Grates specially adapted for incinerators
    • 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 method for burning solids on a water-cooled Thrust combustion grate, such as that used in waste incineration plants Installation is coming. Furthermore, it is about a specific grate plate and one made of such Rust plates built up rust, as is necessary to carry out the process.
  • the too burning solids can be a wide variety of types of solids, be it lignite, sawdust, wood and rubber chips, all sorts of residual goods, Industrial waste, sewage sludge, hospital or household waste or rubbish, etc. etc.
  • the primary air is blown through from below the grate through the grate into the combustion bed.
  • the primary air reaches the top of the grate through recesses in the cast grate bars on the side and / or in the head region. The primary air is conveyed through the grate by building up corresponding overpressures of the order of magnitude of approx.
  • the grate plates then have primary air supply channels on, for example, primary air supply pipes passing through the grate plate, which can also taper towards the top, or are the primary air supply channels formed by recesses for the passage of primary air, so that the primary air that is, it can be conducted from below the grate through it onto its upper side.
  • the grate plates that run across the width can no longer slag between individual Grate elements fall through under the grate, as is the case with grate levels consisting of several loose parts adjacent grate bars is the case. This makes slag diarrhea practical prevented.
  • Another object of the present invention is a grate plate and to indicate a grate built up from such grate plates on which this method can be exercised.
  • This object is achieved by a method for burning solids on a Shear combustion grate, which is characterized in that by the shear combustion grate primary air fed into the combustion bed after it flows through by means of The sliding grate surface of the guide elements arranged is deflected. Furthermore, the Task solved by a grate plate and a grate from such grate plates as for the Implementation of the method is necessary, according to the features of claim 5 Grate plate and claim 10 for rust.
  • Thrust combustion grates have stationary and movable grate levels made of grate plates or from a series of grate bars, the grate steps being stepped on one another lie on. These sliding combustion grates can be installed so that the combustion bed in the is essentially horizontal, or inclined, with inclinations of up to 20 degrees or more are common.
  • EP-0'621'449 describes a water-cooled thrust combustion grate known. Its grate plates are made of sheet steel and form board-shaped hollow bodies that extend across the width of the entire grate track and through which water is passed as a cooling medium. Every second grate plate is movable and can therefore perform a stoking or transport stroke.
  • the movable grate plates can be fired with their end face Push it onto the next lower grate plate.
  • a push-back grate forms a somewhat wrong built-in, inclined staircase.
  • the end faces of the movable grate plates transport the one behind them with a push-back grate Firing material back, after which it rolls down again in the direction of the tendency to rust.
  • the movable grate plates i.e. between two stationary grate plates arranged grate plates are usually collectively back and forth in the direction of their inclination emotional. This ensures that the burning rubbish lying on the grate at a long dwell time of 45 to 120 minutes constantly rearranged and even on the grate is distributed.
  • FIG. 1 An advantageous construction of this thrust combustion grate with its essential elements can be seen in Figure 1, in which a portion of a thrust combustion grate is shown using a cross section.
  • the grate consists of stairs Grate levels, which are each formed by a hollow, water-cooled grate plate 1,2,3,4. Every second grate level, in the figure the grate plates 2 and 4, is designed to be movable while the intermediate grate plates are suspended on cross tubes 5.
  • the moveable Grate plates 2.4 are each laterally mounted on a roller 6 and lie with it Rear part on vertical rollers 7, which are arranged on the laterally delimiting planks are.
  • Each movable grate plate 2.4 is from its own hydraulic piston-cylinder unit 8 driven.
  • each grate plate open through the grate plate extending pipes 9 for the supply of primary air from the area below the Rust.
  • These primary air supply pipes 9 open somewhat above the surface of the grate plate and have an elongated hole-shaped cross section, as will be shown later becomes. In this way it has already been avoided that excessive amounts of these tubes Slag falls through.
  • the mouths of these primary air pipes 9 or corresponding primary air supply channels are as shown here with guide elements 10 in the form of muzzle caps made of bow-shaped baffles that are simply welded onto the top of the grate plate are.
  • the upper section of the baffles is V-shaped in cross section.
  • the of The primary air jet impinging on these guide plates is therefore from the guide plates divided and distracted laterally.
  • the bow-shaped baffles cover the mouth in the thrust direction of the grate, so that the fired material is guided around the baffles and does not directly cover the primary air outlets.
  • FIG 2 is a part of the front edge of a grate plate with a design of the guide elements in the form of welded bow-shaped guide plates 10 in a perspective view shown.
  • the mouth or nozzle caps 10 are welded in the form of the bow-shaped guide plates 10.
  • These baffles 10 consist of sheet steel and form seen from the side, if they are welded on, a trapezoidal shape, the piece of sheet metal which the forms the upper side of the trapezoid, is V-shaped in cross section, which is indicated by a simple folding can be achieved.
  • the one that hits from below becomes Primary air flow divided into two as indicated by the arrows and deflected laterally and thereby also swirled.
  • the effect is that the air at a significantly reduced speed and penetrates diffusely into the kiln.
  • the air passing through in a row arranged primary air orifices flows in, the combustion bed in its entirety Diffuse penetration wide, so that the atmospheric oxygen much more homogeneous than before Combustion is supplied.
  • the bow-shaped Baffles can also form a semicircular arc, or one Angle welded onto the grate plate like a gable above the mouth.
  • the Mounting direction can be chosen arbitrarily, so that the angle plane also in right angle to the direction of thrust. If the sheets as in the figure shown, this also ensures that the primary air supply openings are not clog.
  • FIG. 3 shows a grate plate with a design of the guide elements in the form of welded flat baffles 12.
  • This variant also fulfills the intended purpose, namely the deflection of the primary air and its diffusion, which in turn is indicated by arrows is.
  • These flat bars 12 can serve a further purpose. They seem namely as barbs and take each time the movable plates are pushed forward the firing material lying in front of the area of the flat iron 12 while pulling it back release this again and then the primary air flows back to the flat iron 12 and it cools. That lying on the grate in the vertical direction above the flat iron 12 Firing material is separated from the underlying material by this take-away, so that there is a horizontal shift of the combustion bed layers.
  • FIG. 4 shows a further variant for a guide element, in this case a sawtooth-shaped one Sheet 13, similar to the shape of a cutter bar knife, across the width of the grate on the The front edge of the grate plate is welded on.
  • the saw teeth each protrude above a nozzle the primary air supply, so that the emerging primary air flow onto one sawtooth each strikes and is deflected by this towards the front and the two sides.
  • FIG. 5 shows an embodiment with screwed-on orifice caps 14.
  • the primary air supply ducts or pipes are circular in this case and the pipe openings, which protrude slightly from the grate plate surface have an external thread.
  • the nozzle cap 14 is screwed onto this.
  • These nozzle caps 14 are standard fittings with hexagonal outer shape, which are used for this purpose be provided with radial bores 15.
  • the fittings are only a small one Part of their thread screwed on, so that the primary air is unhindered by the radial Holes 15 can emerge. It is therefore after the pipe mouth of the fittings deflected and radially flows out through the six holes shown in the example, whereby it diffuses on all sides into the surrounding firing material, as indicated by the arrows. Clogging of the mouths arranged all around is due to the relative movement of the Mouth and nozzle caps 14 to the transported firing material impossible.
  • Such nozzle caps can of course also have other shapes and are welded on instead of being screwed on.
  • FIG. 6 shows a further embodiment variant for the guide elements. These exist here from tubes 16 with an elongated cross section 17. These tubes 16 are at one end closed and there form a rounded cap 18. With its open side down these tubes 16 are directed into corresponding elongated holes in the upper and lower grate plate used and sealed in these elongated holes. They are there longer than the grate plate thickness and with its lower end flush with the underside welded into the grate plate so that it can then be Exceed the grate plate surface at the end. On both sides of the grate overhanging the grate Section of the tubes 16 are below the caps 18 in the flat areas Slots 19 are provided, which are directed in the tube 16 from the inside outwards towards the bottom.
  • the air is thereby deflected in the cap 18 and then flows depending on Execution of the slots 19 in the caps 18 upwards, horizontally or obliquely downwards through them onto the garbage bed, and secondly, the slots 19 are through this arrangement largely protected against constipation from fired goods, because they only move lengthways of the kiln and, as I said, are directed downwards.
  • the rounded Caps 18 can the pipe sections that protrude beyond the grate plate surface with the move the moving grate plates through the firing material, or the firing material can touch it Pipe sections are pushed past without getting stuck on sharp edges and a pipe 16 may be deformed or even torn thereby.
  • such guide elements described for the figures can be on the top the grate can only be realized on water-cooled grates, because these remain in operation at a low temperature so that most of the heat comes from the guide elements the rust is drained off. On the other hand, such elements would be innate on air-cooled grates burn in no time.
  • a thrust combustion grate built up from water-cooled grate plates can also such guiding elements and then basically allows that through the shear combustion grate on the combustion bed supplied primary air after the outlet the sliding grate surface is first deflected.
  • the resulting diffusion of the primary air and consequently its more homogeneous penetration of the combustion bed turns out to be enormously beneficial for the quality of the combustion.
  • FIG. 7 shows a diagram for assessing the quality of the combustion, the flue gases G and the system efficiency E being plotted as a function of the O 2 content in the flue gas G.
  • the CO value is regarded as a superordinate measure of the quality of combustion.
  • CO max the CO limit value
  • the aim of the combustion control must therefore be to keep the O 2 value so low that the NO x content becomes minimal and at the same time the CO limit value is just maintained.
  • Such an ideal working point is shown in the diagram.
  • it also guarantees high system efficiency. Because of the optimized oxygen input with the present method, less air has to be blown through the firing material. This brings you closer to the basic goal of stoichiometric combustion. You also have less dust ejection. The dust particles are also less fast. This reduces the erosion of the boiler walls. Fast and many dust particles treat the boiler walls like sandblasting.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Incineration Of Waste (AREA)
  • Processing Of Solid Wastes (AREA)
  • Furnace Details (AREA)
  • Solid-Fuel Combustion (AREA)
  • Gasification And Melting Of Waste (AREA)
EP98810971A 1997-10-29 1998-09-28 Procédé de combustion pour matières solides sur une grille coulissante refroidie par eau, ainsi que barreau de grille et grille pour la mise en oeuvre du procédé Expired - Lifetime EP0919771B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CH2498/97 1997-10-29
CH249897 1997-10-29
CH249897 1997-10-29
CH99098 1998-05-03
CH990/98 1998-05-03
CH99098 1998-05-03

Publications (3)

Publication Number Publication Date
EP0919771A2 true EP0919771A2 (fr) 1999-06-02
EP0919771A3 EP0919771A3 (fr) 1999-07-07
EP0919771B1 EP0919771B1 (fr) 2000-11-29

Family

ID=25686326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98810971A Expired - Lifetime EP0919771B1 (fr) 1997-10-29 1998-09-28 Procédé de combustion pour matières solides sur une grille coulissante refroidie par eau, ainsi que barreau de grille et grille pour la mise en oeuvre du procédé

Country Status (8)

Country Link
US (1) US6155184A (fr)
EP (1) EP0919771B1 (fr)
JP (1) JP3037666B2 (fr)
KR (1) KR19990037436A (fr)
AT (1) ATE197845T1 (fr)
CA (1) CA2249842A1 (fr)
DE (1) DE59800363D1 (fr)
NO (1) NO984541L (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016198119A1 (fr) * 2015-06-12 2016-12-15 Hitachi Zosen Inova Ag Bloc de grille pour une grille de combustion

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6981455B2 (en) * 2002-03-08 2006-01-03 Lefcort Malcolm D Two-stage wet waste gasifier and burner
DE102004040048A1 (de) * 2004-08-18 2006-02-23 Ikn Gmbh Rostplattenanordnung für Stufenroste
CN101046293B (zh) * 2006-03-28 2011-11-09 高桥贤三 加煤机型热分解炉
DE102009009285B4 (de) * 2009-02-17 2013-11-28 Ikn Gmbh Rostplattenanordnung
US10180254B2 (en) * 2014-09-16 2019-01-15 Hitachi Zosen Inova Ag Method and device for processing slag occurring in a combustion chamber of a refuse incineration plant
CN104197318B (zh) * 2014-09-19 2017-03-22 四川能节环保科技有限公司 洁净煤绿色低氮燃烧高效节能减碳炉
NO343011B1 (en) * 2017-04-26 2018-09-24 Aitos Gasification Tech As Furnace for gasification and oxidation of solid fuel
HUE069502T2 (hu) * 2019-07-05 2025-03-28 Kanadevia Inova Ag Rostélyblokk tüzelõrostélyhoz

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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CH636942A5 (de) * 1979-05-30 1983-06-30 Sulzer Ag Wirbelschichtfeuerung mit einem ebenen rost.
JPS56149518A (en) * 1980-04-21 1981-11-19 Satake Eng Co Ltd Granular material combustor
JPS5824720A (ja) * 1982-07-12 1983-02-14 Takuma Co Ltd 階段式中空スト−カ
JPS6033419A (ja) * 1983-08-03 1985-02-20 Ishikawajima Harima Heavy Ind Co Ltd 焼却残渣処理装置
JPS60101533U (ja) * 1983-12-15 1985-07-11 有限会社　極厚鋼管 炉床
FR2574160A1 (fr) * 1984-11-30 1986-06-06 Electricite De France Grille de foyer realisee a partir d'elements permettant un controle ameliore de l'apport en air primaire
DE3521266A1 (de) * 1985-06-13 1986-12-18 Walter Josef Dipl.-Ing. 8000 München Martin Roststab fuer einen feuerungsrost einer grossfeuerung und feuerungsrost fuer diese grossfeuerung
JPH0769048B2 (ja) * 1991-05-21 1995-07-26 日本鋼管株式会社 ごみ焼却炉用火格子
DE4400992C1 (de) * 1994-01-14 1995-05-11 Noell Abfall & Energietech Roststab und Rost mit Kühleinrichtung
DE19528310A1 (de) * 1995-08-02 1997-02-06 Abb Management Ag Rost für eine Feuerungsanlage
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Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016198119A1 (fr) * 2015-06-12 2016-12-15 Hitachi Zosen Inova Ag Bloc de grille pour une grille de combustion
CN107850302A (zh) * 2015-06-12 2018-03-27 日立造船爱诺瓦公司 用于燃烧炉排的炉排块
RU2673020C1 (ru) * 2015-06-12 2018-11-21 Хитачи Зосен Инова Аг Решетчатый элемент для колосниковой решетки
US10760787B2 (en) 2015-06-12 2020-09-01 Hitachi Zosen Inova Ag Grate block for a combustion grate
CN107850302B (zh) * 2015-06-12 2020-09-04 日立造船爱诺瓦公司 用于燃烧炉排的炉排块、燃烧炉排及其用途和废物燃烧设施
AU2015398478B2 (en) * 2015-06-12 2021-07-01 Kanadevia Inova Ag Grate block for a combustion grate

Also Published As

Publication number Publication date
JP3037666B2 (ja) 2000-04-24
EP0919771B1 (fr) 2000-11-29
NO984541L (no) 1999-04-30
EP0919771A3 (fr) 1999-07-07
JPH11211045A (ja) 1999-08-06
ATE197845T1 (de) 2000-12-15
CA2249842A1 (fr) 1999-04-29
KR19990037436A (ko) 1999-05-25
NO984541D0 (no) 1998-09-29
DE59800363D1 (de) 2001-01-04
US6155184A (en) 2000-12-05

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