EP0874196B1 - Method and device for removing deposits from supply nozzles or conduits of combustion installations - Google Patents

Method and device for removing deposits from supply nozzles or conduits of combustion installations Download PDF

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Publication number
EP0874196B1
EP0874196B1 EP98105977A EP98105977A EP0874196B1 EP 0874196 B1 EP0874196 B1 EP 0874196B1 EP 98105977 A EP98105977 A EP 98105977A EP 98105977 A EP98105977 A EP 98105977A EP 0874196 B1 EP0874196 B1 EP 0874196B1
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EP
European Patent Office
Prior art keywords
medium
deposits
supply
feed
nozzle
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EP98105977A
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German (de)
French (fr)
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EP0874196A2 (en
EP0874196A3 (en
Inventor
Johannes Josef Edmund Dipl.-Ing. Martin
Peter Spichal
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Martin GmbH fuer Umwelt und Energietechnik
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Martin GmbH fuer Umwelt und Energietechnik
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • 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
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • 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
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F23L9/02—Passages or apertures for delivering secondary air for completing combustion of fuel  by discharging the air above the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2203/00—Furnace arrangements
    • F23G2203/101—Furnace arrangements with stepped or inclined grate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/00001—Exhaust gas recirculation

Definitions

  • the invention relates to a method for removal of deposits in and on feed nozzles or feed pipes of firing systems in which recirculated Exhaust gas that is fed back into a combustion chamber will fix these deposits, taking care of the deposits applied a liquid or vapor medium becomes.
  • the invention also relates to a device for carrying it out of the procedure.
  • exhaust gas after a certain cooling (e.g. in a steam generator) or from suitable areas the exhaust gas of the Withdrawn from the combustion chamber and via feed nozzles or feed pipes fed back into the combustion chamber.
  • the reasons for the recirculation of exhaust gas can in the pursuit a high thermal efficiency of the plant, in the generation particularly high turbulence in the area of the secondary combustion zone, in exploiting the still in the exhaust existing oxygen and for regulating the oxygen content be seen in the secondary combustion zone.
  • the exhaust gas is preferably after one of the heat use downstream exhaust gas cleaning system, e.g. the dedusting device, deducted. But it can also be from the can be taken from the rear of the combustion chamber, in which there is already largely burnt out fuel and therefore the exhaust gases are still relatively high Have oxygen content.
  • This Deposits occur in the area of the mouth of the feed nozzles or feed pipes both inside these feed nozzles and feed pipes as well as on the immediate outer surfaces adjacent to the mouth. you will be caused by the strong heat radiation from the firebox, taking this heat radiation to a glazing of the deposits in the part of the furnace facing the furnace Baking and thus a particularly good adhesion and resistant structure that leads in a mechanical way is difficult to destroy.
  • the object of the invention is a method and an apparatus provide with the help of which it is possible to remove these deposits in a simple way during normal operation to remove the combustion system practically residue-free.
  • liquid medium sprayed onto the deposits in droplet form is that the medium in the flow direction of the exhaust gases inside the feed nozzles or feed pipes starting with that in the flow direction of the exhaust gases within the feed nozzles or the feed pipes leading edge the deposits are applied to them.
  • a liquid medium in particular Water
  • This medium By introducing a liquid medium, in particular Water, into the supply nozzles or supply pipes by applying this medium to the deposits in the direction of flow of the exhaust gases within the feed nozzles or feed pipes, being with the application be started at the front edge of the deposits the deposits removed in a short time, after the Experiments carried out so far and the results obtained Knowledge of the cleaning effect arises in that in The liquid inside the feed nozzles or feed pipes Medium quickly penetrates the inside of the deposits. By exposure to heat from the combustion chamber or from the circulated Gas flow evaporates this into the pores of the hygroscopic Deposits of water explosive. The deposits are blown up from the inside. This will not only remove the deposits on the inner wall the feed nozzles or the feed pipes removed, but also around the mouth area to the outside.
  • a liquid medium in particular Water
  • the task at the beginning can also be solved in that the vaporous medium in Direction of flow of the exhaust gases within the feed nozzles or the feed pipes starting with that in the flow direction the exhaust gases inside the feed nozzles or the feed pipes front edge of the deposits is applied to this. It is crucial indicates that the vaporous medium after its penetration a rapid increase in volume in the pores of the deposits learns what is the case when the vapor Medium is water vapor. When using water vapor Expect a longer treatment time (a few minutes up to about 1 hour) because of the increase in the specific volume when the temperature rises is significantly lower than, for example when using water.
  • the application of the medium in the direction of flow of the exhaust gases inside the feed nozzles and especially at the front Edge of the deposits has the advantage that the medium, preferably Water, deposits reached inside the Feed nozzle or the feed pipe and the still have a rough and porous surface because they are against the heat radiation from the combustion chamber through the feed nozzle or the feed pipe is better protected as deposits on the outside of the feed nozzle or of the feed pipe, where due to the strong heat glazing of these deposits occurs.
  • the medium can therefore begin at a point where it is still easy to get into the deposits can penetrate with the explained Explosives begin, which then move towards the Mouth of the feed nozzle or the feed pipe to to the outside of the feed nozzle or the feed pipe continues.
  • the droplets By supplying the liquid medium by means of a supply nozzle in droplet form, the droplets being so have a small size so that the medium is sprayed on, becomes a uniform wetting of the surface of the deposits achieved with relatively low media consumption. Excess medium will escape from the Feed nozzles or the feed pipes largely avoided, so that an impairment of the combustion in the There is no combustion chamber due to excessively large quantities of medium escaping. It is particularly advantageous if the liquid medium in fine distribution as a droplet mist on the deposits is applied.
  • the medium is concentric with the feed nozzle or is fed to the feed pipe.
  • the cone angle of the medium veil can range from 10 ° to Be adjustable by 180 °.
  • the medium pressure in particular the water pressure is the pressure of a public water supply network corresponds and is preferably 6 bar. It is beneficial if both the pressure and the amount as well the feed time and the duration between two Medium supply phases are adjustable.
  • JP-A-01 300 117 a device is known with which Water on deposits at the burner outlet Coal dust burner can be applied, according to Switching off the coal dust burner and after switching off an oil burner arranged concentrically to this water through the atomizing nozzle of the oil burner to the Deposits is sprayed on.
  • water is included low temperature used to remove the deposits cool.
  • the wall of the furnace, the water-bearing one Has pipes for steam generation, when spraying of water on the deposits through an air jacket protected, which envelops the spray cone and its angle allowed to adjust so the water only on the outside deposits formed on the furnace wall.
  • a device for carrying out the method is identified through a medium connection Lance that is inside a feed nozzle or a Feed pipe for recirculated exhaust gas one Firing system is arranged so that part of the medium against the feed nozzle or the feed pipe a nozzle head arranged at the front end of the lance is sprayed.
  • the application of the invention requires in most cases no special additional effort, since existing ones Systems in the rear area of the feed nozzles or feed pipes lying in the axial direction of the same Have sockets for inserting rods in order to Use these rods to remove the deposits. About these The lances can cut into the interior of the feed nozzles or feed lines are introduced. Training a nozzle head at the free end of the lance enables apply the medium to the deposits in finely divided form. It is again advantageous if the spray angle of the Nozzle head is adjustable to adjust the trained medium veil to the present To be able to make circumstances.
  • the lance inside the feed nozzle or the feed pipe in is kept displaceable in the longitudinal direction, so is an adjustment of the medium outlet to the respective places where there are deposits.
  • the medium emerging from the nozzle head of the advancing Track cleaning effect within the feed nozzle is possible.
  • FIG. 1 shows a furnace with a feed hopper 1 with subsequent chute 2 for the task of Fired goods on a feed table 3, on the loading piston 4 are provided to the coming from the feed chute Place the firing material on a grate 5.
  • a total designated 6 device provided for the supply of primary combustion air.
  • exhaust gas is re-introduced sucked into the firebox.
  • a suction opening 12 is provided, from which a suction line 13 extends into which a fan 14 is inserted.
  • a line 15 With the pressure side of the fan is a line 15 connected to the amount of exhaust gas extracted feeds a ring line 16, from the so-called secondary air nozzles 17 are fed, via which the exhaust gas extracted is returned to the combustion chamber 7.
  • FIGS. 2 and 3 there is 18 in the wall of the combustion chamber 7 within a niche 19 of the same Feed nozzle or a feed tube 20 is used, wherein the feed nozzle 20 via a flange connection 21 connected to a total of 22 designated manifolds is.
  • the manifold has an aligned one hand the feed nozzle 20 aligned tube 23 and another Tube 24 on that with the ring line 16 for the returned Exhaust gas is connected.
  • a closure cover 25 is provided, in the center of a holding device 26 for a Lance 27 is provided.
  • the holding device 26 is in the Able to receive the lance 27 displaceably in its longitudinal direction.
  • a nozzle head 28 intended at the front end of the lance 27 .
  • a valve device 29 is arranged at the rear end of the lance 27, to which a water supply line in the form of a Hose 30 is flanged.
  • the valve device 29 stands via a line 31 to a control device 32 in connection, which is able to supply water to the lance 27 regulate in terms of pressure and quantity and also to shut off and open the valve device 29, whereby also the time intervals between the opening phases and the Length of the opening phases set by the control device 32 can be.
  • the nozzle head 28 provided at the front end of the lance 27 allows water to be sprayed out in the form of a conical Water curtain, the cone angle is adjustable.
  • This water curtain is in figure with dash-dotted lines 3 indicated and provided with the reference number 33.
  • dashed lines Lines 34 depict deposits that are both inside the feed nozzle as well as on the outside thereof occur when exhaust gas from the supply nozzle 20 is blown into the combustion chamber 7. The length of time in which such deposits form depends on the composition of the exhaust gas and also depending on whether only exhaust gas or exhaust gas mixed with ambient air via the supply nozzles 20 is introduced into the combustion chamber 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Incineration Of Waste (AREA)
  • Cleaning In General (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Processing Of Solid Wastes (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Air Supply (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

A lance (27) is inserted inside a feeder nozzle (20) or pipe for recirculated flue gas belonging to a furnace. The front free end of the lance has a nozzle head (28) with adjustable spray angle. The feeder pipe (30) to the lance is used as a regulatable valve arrangement (29). It is used for opening and shutting the medium inflow, pressure and quantity and for adjusting opening periods and intervals between two opening phases with regulator (32).

Description

Die Erfindung bezieht sich auf ein Verfahren zum Entfernen von Ablagerungen in und an Zuführungsdüsen oder Zuführungsrohren von Feuerungsanlagen, bei welchen sich aus rezirkuliertem Abgas, das einem Feuerraum wieder zugeführt wird, diese Ablagerungen festsetzen, wobei auf die Ablagerungen ein flüssiges oder dampfförmiges Medium aufgebracht wird. Die Erfindung betrifft auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for removal of deposits in and on feed nozzles or feed pipes of firing systems in which recirculated Exhaust gas that is fed back into a combustion chamber will fix these deposits, taking care of the deposits applied a liquid or vapor medium becomes. The invention also relates to a device for carrying it out of the procedure.

Bei Feuerungsanlagen, insbesondere bei solchen, in denen Abfallstoffe verbrannt werden, wird aus verschiedenen Gründen Abgas nach einer gewissen Abkühlung (z.B. in einem Dampferzeuger) oder aus dafür geeigneten Bereichen das Abgas des Feuerraumes abgezogen und über Zuführungsdüsen oder Zuführungsrohre dem Feuerraum wieder zugeführt. Die Gründe für das Rückführen von Abgas können in dem Streben nach einem hohen thermischen Wirkungsgrad der Anlage, in der Erzeugung einer besonders hohen Turbulenz im Bereich der Sekundärverbrennungszone, im Ausnutzen des noch im Abgas vorhandenen Sauerstoffes und zur Regelung des Sauerstoffgehaltes in der Sekundärverbrennungszone gesehen werden. Dabei wird das Abgas vorzugsweise nach einer der Wärmenutzung nachgeschalteten Abgasreinigungsanlage, z.B. der Entstaubungsvorrichtung, abgezogen. Es kann aber auch aus dem hinteren Bereich des Feuerraumes entnommen werden, in welchem sich bereits weitgehend ausgebrannter Brennstoff befindet und die Abgase somit noch einen verhältnismäßig hohen Sauerstoffanteil besitzen.In combustion plants, especially those in which waste materials will be burned for various reasons Exhaust gas after a certain cooling (e.g. in a steam generator) or from suitable areas the exhaust gas of the Withdrawn from the combustion chamber and via feed nozzles or feed pipes fed back into the combustion chamber. The reasons for the recirculation of exhaust gas can in the pursuit a high thermal efficiency of the plant, in the generation particularly high turbulence in the area of the secondary combustion zone, in exploiting the still in the exhaust existing oxygen and for regulating the oxygen content be seen in the secondary combustion zone. there the exhaust gas is preferably after one of the heat use downstream exhaust gas cleaning system, e.g. the dedusting device, deducted. But it can also be from the can be taken from the rear of the combustion chamber, in which there is already largely burnt out fuel and therefore the exhaust gases are still relatively high Have oxygen content.

Bei einer solchen Betriebsweise hat man nun festgestellt, daß die Zuführungsdüsen oder Zuführungsrohre, die auch für die Zuführung von Sekundärluft dienen können, im Bereich ihrer Austrittsöffnung durch Ablagerungen, die vom Abgas stammen, allmählich zugesetzt werden, so daß in bestimmten Zeitabständen diese Ablagerungen entfernt werden müssen, um den freien Austrittsquerschnitt der Zuführungsdüsen oder Zuführungsrohre wieder herzustellen. Bisher erfolgte das Entfernen der Ablagerungen mechanisch durch Abschlagen oder Abstoßen mittels entsprechender Stangen, was nicht nur mühsam und zeitaufwendig ist, sondern auch deshalb unbefriedigend ist, weil die äußerst stark anhaftenden Ablagerungen nur vom Feuerraum her vollständig entfernt werden können, was das Abstellen und Abkühlen der betroffenen Anlage erfordert. Diese Ablagerungen treten im Bereich der Mündung der Zuführungsdüsen oder Zuführungsrohre sowohl im Inneren dieser Zuführungsdüsen und Zuführungsrohre als auch an den unmittelbar an die Mündung angrenzenden Außenflächen auf. Sie werden durch die starke Hitzeeinstrahlung aus dem Feuerraum hervorgerufen, wobei diese Hitzeeinstrahlung zu einer Verglasung der Ablagerungen in dem der Feuerung zugewandten Teil der Anbackung und damit zu einer besonders gut haftenden und widerstandsfähigen Struktur führt, die auf mechanische Weise nur schwer zu zerstören ist.In such an operation, it has now been found that the feed nozzles or feed pipes, which are also for the Supply of secondary air can serve in the area of their Outlet opening through deposits originating from the exhaust gas, be gradually added so that at certain time intervals these deposits need to be removed to keep the free Outlet cross section of the feed nozzles or feed pipes restore. So far, the removal of Deposits mechanically by knocking off or repelling them by means of appropriate poles, which is not only tedious and is time-consuming, but is therefore also unsatisfactory, because the extremely strongly adhering deposits only from the firebox forth can be completely removed what the parking and cooling the affected system. This Deposits occur in the area of the mouth of the feed nozzles or feed pipes both inside these feed nozzles and feed pipes as well as on the immediate outer surfaces adjacent to the mouth. you will be caused by the strong heat radiation from the firebox, taking this heat radiation to a glazing of the deposits in the part of the furnace facing the furnace Baking and thus a particularly good adhesion and resistant structure that leads in a mechanical way is difficult to destroy.

Aus der DE-Zeitschrift "Energie", 1951, Heft 1, ist es zur Reinigung von Kesselrohren bekannt, mittels einer Lanze Wasser auf Rohrflächen aufzuspritzen, bis diese abkühlen, wonach ein benachbarter Bereich bespritzt wird, um dann wieder zum ersten Bereich zurückzukehren, wenn sich dieser nach dem Abkühlen wieder erwärmt hat. Hier sollen Rissebildungen eintreten, die zu einem Abplatzen der Verschmutzungen führen. Weiterhin ist es aus dieser Zeitschrift bekannt, Heizflächen mittels eines Wasserdampf-Ammoniakdampf-Gemisches zu behandeln. Hierbei ist das Einführen der Zuführungsrohre in den Kessel erst nach einer gewissen Abkühlung desselben möglich, was eine entsprechende Betriebsunterbrechung erfordert. Außerdem sind chemische Zusätze zum Dampf wegen möglicher Korrosionsschäden bedenklich.From DE magazine "Energie", 1951, Issue 1, it is for cleaning known from boiler pipes, by means of a lance of water spray on pipe surfaces until they cool, after which a adjacent area is sprayed, then back to the first Area to return when this cools down warmed up again. Cracks should form here, which lead to chipping of the dirt. Furthermore, it is known from this magazine, heating surfaces to be treated with a steam-ammonia vapor mixture. Here is the insertion of the feed pipes in the Boiler only possible after it has cooled down a bit, which requires a corresponding business interruption. In addition, chemical additives to steam are possible because of Corrosion damage worrying.

Aus der DE-PS 741 701 ist es bekannt, Ablagerungen, die sich oberhalb von Sekundärluft-Ausblasedüsen ansammeln, durch eine Wasserspritzeinrichtung dadurch zu entfernen, daß kalte Wasserstrahlen auf die heiße Schlacke aufgespritzt wird, um die heiße Schlacke infolge der Abschreckung von den Wänden zu entfernen. Diese Art der Entfernung der Schlackenbildung ist nicht sehr wirkungsvoll, weil durch den Abschreckungseffekt nur einige Oberflächenrisse entstehen, weshalb dieser Vorgang häufig wiederholt werden muß bis ein Abplatzen der Schlacke erzielt werden kann. Der Grund für diese aufwendige Maßnahme besteht darin, daß es sich bei den gebildeten Ablagerungen um an der Oberfläche verglaste Schlacken handelt, die ohne Rissebildung kein Wasser in das Innere hineinlassen. Erst die häufige Wechselwirkung zwischen Erhitzen und Abschrecken führt zu Rissebildung und einer Entfernung dieser Ablagerungen. Diese Verfahrensweise hat auch noch den Nachteil, daß ein hohes Spannungsrisiko für Kesselrohrwände oder die keramischen Auskleidungen aufgrund der erwähnten Wechselwirkungen besteht.From DE-PS 741 701 it is known to build up deposits Collect above the secondary air outlet nozzles to remove a water spray device in that cold Jets of water are sprayed onto the hot slag the hot slag as a result of the deterrence from the walls to remove. This type of slag removal is not very effective because of the deterrent effect only a few surface cracks arise, which is why this Process must be repeated frequently until the Slag can be obtained. The reason for this elaborate Measure is that it is in the deposits formed is slag glazed on the surface, that do not let water inside without cracking. Only the frequent interaction between heating and quenching leads to crack formation and removal Deposits. This procedure also has the Disadvantage that a high voltage risk for boiler tube walls or the ceramic linings due to the mentioned Interactions exist.

Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung bereitzustellen, mit deren Hilfe es möglich ist, diese Ablagerungen auf einfache Weise während des normalen Betriebes der Feuerungsanlage praktisch rückstandsfrei zu entfernen.The object of the invention is a method and an apparatus provide with the help of which it is possible to remove these deposits in a simple way during normal operation to remove the combustion system practically residue-free.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das flüssige Medium in Tröpfchenform auf die Ablagerungen aufgesprüht wird, daß das Medium in Strömungsrichtung der Abgase innerhalb der Zuführungsdüsen oder Zuführungsrohre beginnend mit dem in Strömungsrichtung der Abgase innerhalb der Zuführungsdüsen oder der Zuführungsrohre vorderen Rand der Ablagerungen auf diese aufgebracht wird.This object is achieved in that the liquid medium sprayed onto the deposits in droplet form is that the medium in the flow direction of the exhaust gases inside the feed nozzles or feed pipes starting with that in the flow direction of the exhaust gases within the feed nozzles or the feed pipes leading edge the deposits are applied to them.

Durch das Einführen von einem flüssigen Medium, insbesondere Wasser, in die Zuführungsdüsen oder Zuführungsrohre und zwar durch das Aufbringen dieses Mediums auf die Ablagerungen in Strömungsrichtung der Abgase innerhalb der Zuführungsdüsen oder Zuführungsrohre, wobei mit dem Aufbringen am vorderen Rand der Ablagerungen begonnen wird, werden die Ablagerungen in kurzer Zeit entfernt, wobei nach den bisher durchgeführten Versuchen und den dabei gewonnenen Erkenntnissen die Reinigungswirkung darin entsteht, daß im Inneren der Zuführungsdüsen oder Zuführungsrohre das flüssige Medium rasch in das Innere der Ablagerungen eindringt. Durch Hitzeeinwirkung aus dem Feuerraum oder aus dem zirkulierten Gasstrom verdampft dieses in die Poren der hygroskopischen Ablagerungen eingedrungene Wasser explosionsartig. Die Ablagerungen werden von innen her aufgesprengt. Hierdurch werden nicht nur die Ablagerungen an der Innenwand der Zuführungsdüsen oder der Zuführungsrohre entfernt, sondern darüber hinaus auch um den Mündungsbereich herum zur Außenseite. Dies liegt darin, daß das Wasser aufgrund der vom Innenbereich der Zuführungsdüse oder des Zuführungsrohres beginnenden Aufsprengung der Ablagerungen auf rauhe und somit poröse Flächenteile der Ablagerungen trifft, die im Inneren der bereits gebildeten Ablagerungen liegen und somit nicht verglast sind, wie dies an der Außenfläche der am Außenumfang der Zuführungsdüsen oder Zuführungsrohre befindlichen Ablagerungen, die direkt der Wärmeeinstrahlung aus dem Feuerraum unterliegen, der Fall ist. Somit setzt sich die Absprengwirkung ausgehend vom Innenbereich der Zuführungsdüse oder des Zuführungsrohres bis zur Mündung und auch um die Mündung herum zur Außenseite der Zuführungsdüsen oder der Zuführungsrohre fort. Bei jedem Absprengen werden neue rauhe und poröse Flächen geschaffen, so daß die Entfernung der Ablagerungen auch dort möglich ist, wo die Oberfläche bereits verglast ist. Bereits nach kurzer Behandlung (einige Sekunden bis wenige Minuten) können nahezu metallisch glänzende, von den Ablagerungen befreite Flächen im Mündungsbereich der Zuführungsdüsen oder Zuführungsrohre wieder hergestellt werden. Die eingangs gestellte Aufgabe kann auch dadurch gelöst werden, daß das dampfförmige Medium in Strömungs-richtung der Abgase innerhalb der Zuführungsdüsen oder der Zuführungsrohre beginnend mit dem in Strömungsrichtung der Abgase innerhalb der Zuführungsdüsen oder der Zuführungs-rohre vorderen Rand der Ablagerungen auf diese aufgebracht wird. Dabei kommt es entscheidend darauf an, daß das dampfförmige Medium nach seinem Eindringen in die Poren der Ablagerungen eine rasche Volumenvergrößerung erfährt, was dann der Fall ist, wenn das dampfförmige Medium Wasser-dampf ist. Beim Einsatz von Wasserdampf ist mit einer längeren Behandlungszeit zu rechnen (einige Minuten bis ca. 1 Stunde), da die Vergrößerung des spezifischen Volumens bei der Temperaturerhöhung deutlich geringer ist als beispielsweise beim Einsatz von Wasser.By introducing a liquid medium, in particular Water, into the supply nozzles or supply pipes by applying this medium to the deposits in the direction of flow of the exhaust gases within the feed nozzles or feed pipes, being with the application be started at the front edge of the deposits the deposits removed in a short time, after the Experiments carried out so far and the results obtained Knowledge of the cleaning effect arises in that in The liquid inside the feed nozzles or feed pipes Medium quickly penetrates the inside of the deposits. By exposure to heat from the combustion chamber or from the circulated Gas flow evaporates this into the pores of the hygroscopic Deposits of water explosive. The deposits are blown up from the inside. This will not only remove the deposits on the inner wall the feed nozzles or the feed pipes removed, but also around the mouth area to the outside. This is because the water due to the from the inside of the feed nozzle or the feed pipe beginning to burst the deposits on rough and thus meets porous surface parts of the deposits that in the Are inside the deposits already formed and thus are not glazed, as this is on the outer surface of the Outer periphery of the feed nozzles or feed pipes located Deposits that are directly exposed to heat radiation subject to the combustion chamber, which is the case. Thus, the Blasting effect starting from the inside of the feed nozzle or the feed pipe to the mouth and also around the mouth to the outside of the feed nozzles or the feed pipes. With each blast new rough and porous surfaces are created, so that the Removal of the deposits is also possible where the Surface is already glazed. After just a short treatment (a few seconds to a few minutes) can be almost metallic shiny surfaces in the Mouth area of the feed nozzles or feed pipes be restored. The task at the beginning can can also be solved in that the vaporous medium in Direction of flow of the exhaust gases within the feed nozzles or the feed pipes starting with that in the flow direction the exhaust gases inside the feed nozzles or the feed pipes front edge of the deposits is applied to this. It is crucial indicates that the vaporous medium after its penetration a rapid increase in volume in the pores of the deposits learns what is the case when the vapor Medium is water vapor. When using water vapor Expect a longer treatment time (a few minutes up to about 1 hour) because of the increase in the specific volume when the temperature rises is significantly lower than, for example when using water.

Das Aufbringen des Mediums in Strömungsrichtung der Abgase innerhalb der Zuführungsdüsen und insbesondere am vorderen Rand der Ablagerungen hat den Vorteil, daß das Medium, vorzugsweise Wasser, Ablagerungen erreicht, die im Inneren der Zuführungsdüse oder des Zuführungsrohres liegen und die noch eine rauhe und poröse Oberfläche aufweisen, weil sie gegen die Wärmeeinstrahlung aus dem Feuerraum durch die Zuführungsdüse oder das Zuführungsrohr besser geschützt sind als Ablagerungen an der Außenseite der Zuführungsdüse oder des Zuführungsrohres, wo aufgrund der starken Hitzeeinwirkung eine Verglasung dieser Ablagerungen eintritt. Das Medium kann also beginnend an einer Stelle, wo es noch leicht in die Ablagerungen eindringen kann, mit der erläuterten Sprengwirkung beginnen, die sich dann in Richtung auf die Mündung der Zuführungsdüse oder des Zuführungsrohres bis zur Außenseite der Zuführungsdüse oder des Zuführungsrohres fortsetzt.The application of the medium in the direction of flow of the exhaust gases inside the feed nozzles and especially at the front Edge of the deposits has the advantage that the medium, preferably Water, deposits reached inside the Feed nozzle or the feed pipe and the still have a rough and porous surface because they are against the heat radiation from the combustion chamber through the feed nozzle or the feed pipe is better protected as deposits on the outside of the feed nozzle or of the feed pipe, where due to the strong heat glazing of these deposits occurs. The medium can therefore begin at a point where it is still easy to get into the deposits can penetrate with the explained Explosives begin, which then move towards the Mouth of the feed nozzle or the feed pipe to to the outside of the feed nozzle or the feed pipe continues.

Durch die Zuführung des flüssigen Mediums mittels einer Zuführungsdüse in Tröpfchenform, wobei die Tröpfchen eine so geringe Größe aufweisen, daß das Medium aufgesprüht wird, wird eine gleichmäßige Benetzung der Oberfläche der Ablagerungen bei verhältnismäßig geringem Medienverbrauch erzielt. Dabei wird das Austreten von überschüssigem Medium aus den Zuführungsdüsen oder den Zuführungsrohren weitgehend vermieden, so daß eine Beeinträchtigung der Verbrennung im Feuerraum durch zu große austretende Mediummengen ausbleibt. Es ist besonders vorteilhaft, wenn das flüssige Medium in feiner Verteilung als Tröpfchennebel auf die Ablagerungen aufgebracht wird.By supplying the liquid medium by means of a supply nozzle in droplet form, the droplets being so have a small size so that the medium is sprayed on, becomes a uniform wetting of the surface of the deposits achieved with relatively low media consumption. Excess medium will escape from the Feed nozzles or the feed pipes largely avoided, so that an impairment of the combustion in the There is no combustion chamber due to excessively large quantities of medium escaping. It is particularly advantageous if the liquid medium in fine distribution as a droplet mist on the deposits is applied.

Um eine gleichmäßige Benetzung der Ablagerungen zu erzielen, ist es zweckmäßig, daß das Medium konzentrisch zur Zuführungsdüse oder zum Zuführungsrohr zugeführt wird.In order to achieve an even wetting of the deposits, it is appropriate that the medium is concentric with the feed nozzle or is fed to the feed pipe.

Versuche haben ergeben, daß es vorteilhaft ist, wenn das Wasser in Form eines kegelförmigen Schleiers zugeführt wird. Hierbei kann der Kegelwinkel des Mediumschleiers von 10° bis 180° einstellbar sein. Experiments have shown that it is advantageous if the water is supplied in the form of a conical veil. The cone angle of the medium veil can range from 10 ° to Be adjustable by 180 °.

Aufgrund der erläuterten Sprengwirkung, die das flüssige oder dampfförmige Medium bzw. das Wasser oder der Wasserdampf aufgrund einer sehr rasch einsetzenden Volumenvergrößerung innerhalb der Poren der Ablagerungen ausübt, ist ein hoher Wasser- oder Dampfdruck, wie er beispielsweise mit Hochdruckreinigern oder durch Verwendung des im Dampfkessel erzeugten Hochdruck-Dampfes zu erzielen ist, nicht erforderlich. Es ist deshalb ausreichend, wenn der Mediumdruck, insbesondere der Wasserdruck dem Druck eines öffentlichen Wasserversorgungsnetzes entspricht und vorzugsweise bei 6 bar liegt. Es ist vorteilhaft, wenn sowohl der Druck und die Menge als auch die Zuführungszeit und die Dauer zwischen zwei Mediumzuführungsphasen regelbar sind.Due to the explosive effect that the liquid or vaporous medium or water or water vapor due to a very rapid increase in volume within the pores of the deposits is high Water or steam pressure, such as with pressure washers or by using that generated in the steam boiler Achieving high pressure steam is not necessary. It is therefore sufficient if the medium pressure, in particular the water pressure is the pressure of a public water supply network corresponds and is preferably 6 bar. It is beneficial if both the pressure and the amount as well the feed time and the duration between two Medium supply phases are adjustable.

Aus der JP-A-01 300 117 ist eine Vorrichtung bekannt, mit der Wasser auf Ablagerungen am Brennerausgang eines Kohlestaubbrenners aufgebracht werden kann, wobei nach Abschaltung des Kohlestaubbrenners und nach Abschaltung eines konzentrisch hierzu angeordneten Ölbrenners Wasser durch die Zerstäubungsdüse des Ölbrenners auf die Ablagerungen aufgesprüht wird. Hierbei wird Wasser mit niedriger Temperatur verwendet, um die Ablagerungen zu kühlen. Die Wand der Feuerungsanlage, die wasserführende Rohre zur Dampferzeugung aufweist, wird bei dem Aufsprühen des Wassers auf die Ablagerungen durch einen Luftmantel geschützt, der den Sprühkegel umhüllt und dessen Winkel einzustellen gestattet, damit das Wasser nur auf die außen an der Feuerungswand gebildeten Ablagerungen auftrifft.From JP-A-01 300 117 a device is known with which Water on deposits at the burner outlet Coal dust burner can be applied, according to Switching off the coal dust burner and after switching off an oil burner arranged concentrically to this water through the atomizing nozzle of the oil burner to the Deposits is sprayed on. Here, water is included low temperature used to remove the deposits cool. The wall of the furnace, the water-bearing one Has pipes for steam generation, when spraying of water on the deposits through an air jacket protected, which envelops the spray cone and its angle allowed to adjust so the water only on the outside deposits formed on the furnace wall.

Eine Vorrichtung zur Durchführung des Verfahrens ist gekennzeichnet durch eine einen Mediumanschluß aufweisende Lanze, die in das Innere einer Zuführungsdüse oder eines Zuführungsrohres für rezirkuliertes Abgas einer Feuerungsanlage so angeordnet ist, dass ein Teil des Mediums gegen die Zuführungsdüse oder das Zuführungsrohr durch einen am vorderen Ende der Lanze angeordneten Düsenkopf gesprüht wird.A device for carrying out the method is identified through a medium connection Lance that is inside a feed nozzle or a Feed pipe for recirculated exhaust gas one Firing system is arranged so that part of the medium against the feed nozzle or the feed pipe a nozzle head arranged at the front end of the lance is sprayed.

Die Anwendung der Erfindung erfordert in den meisten Fällen keinen besonderen zusätzlichen Aufwand, da bisher bestehende Anlagen im rückwärtigen Bereich der Zuführungsdüsen oder Zuführungsrohre in Achsrichtung derselben liegende Stutzen für das Einführen von Stangen aufweisen, um mit Hilfe dieser Stangen die Ablagerungen zu entfernen. Über diese Stutzen können die Lanzen in das Innere der Zuführungsdüsen oder Zuführungsleitungen eingeführt werden. Die Ausbildung eines Düsenkopfes am freien Ende der Lanze ermöglicht es, das Medium fein verteilt auf die Ablagerungen aufzubringen. Hierbei ist es wiederum vorteilhaft, wenn der Sprühwinkel des Düsenkopfes einstellbar ist, um eine Anpassung des ausgebildeten Mediumschleiers an die vorliegenden Gegebenheiten vornehmen zu können. The application of the invention requires in most cases no special additional effort, since existing ones Systems in the rear area of the feed nozzles or feed pipes lying in the axial direction of the same Have sockets for inserting rods in order to Use these rods to remove the deposits. About these The lances can cut into the interior of the feed nozzles or feed lines are introduced. Training a nozzle head at the free end of the lance enables apply the medium to the deposits in finely divided form. It is again advantageous if the spray angle of the Nozzle head is adjustable to adjust the trained medium veil to the present To be able to make circumstances.

Wenn in weiterer Ausgestaltung der Erfindung die Lanze im Inneren der Zuführungsdüse oder des Zuführungsrohres in Längsrichtung verschiebbar gehalten ist, so ist eine Anpassung des Mediumaustritts an die jeweiligen Stellen möglich, an denen sich Ablagerungen befinden. Insbesondere ist es möglich, das aus dem Düsenkopf austretende Medium der fortschreitenden Reinigungswirkung innerhalb der Zuführungsdüse nachzuführen.If in a further embodiment of the invention the lance inside the feed nozzle or the feed pipe in Is kept displaceable in the longitudinal direction, so is an adjustment of the medium outlet to the respective places where there are deposits. In particular, it is possible the medium emerging from the nozzle head of the advancing Track cleaning effect within the feed nozzle.

Damit dieser Reinigungsvorgang automatisiert werden kann und somit entsprechend dem beobachteten notwendigen Zeitintervallen eingesetzt werden kann, ist es vorteilhaft, wenn in Weiterbildung der Erfindung in der Zuführungsleitung zur Lanze eine regelbare Ventilvorrichtung vorgesehen ist, die zum Öffnen und Absperren der Mediumzufuhr, zur Regelung des Mediumdruckes und der Mediummenge sowie zur Regelung der Öffnungszeiten und der Abstände zwischen zwei Öffnungsphasen mit einer Regeleinrichtung in Verbindung steht. Mit dieser Ventileinrichtung und einer mit dieser verbundenen Regeleinrichtung ist es dann möglich, die Zeitdauer der Reinigung und die Zeitintervalle zwischen zwei Reinigungsvorgängen sowie den Druck und die Menge entsprechend den jeweiligen Erfordernissen einzustellen.So that this cleaning process can be automated and thus according to the observed necessary time intervals can be used, it is advantageous if in Development of the invention in the feed line for Lance a controllable valve device is provided, which for Opening and shutting off the medium supply to regulate the Medium pressure and the amount of medium and to regulate the Opening times and the intervals between two opening phases is connected to a control device. With this Valve device and a control device connected to this it is then possible to change the duration of the cleaning and the time intervals between two cleaning processes and the Pressure and the amount according to the respective requirements adjust.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. In der Zeichnung zeigen:

Figur 1:
einen Schnitt durch eine schematisch dargestellte Feuerungsanlage mit Zuführdüsen für rezirkuliertes Abgas;
Figur 2:
einen vergrößerten Ausschnitt einer Wand eines Feuerraumes mit eingesetzten Zuführungsdüsen; und
Figur 3:
einen Schnitt durch eine Zuführungsdüse mit einer erfindungsgemäßen Reinigungsvorrichtung in vergrößertem Maßstab.
The invention is explained below with reference to an embodiment shown in the drawing. The drawing shows:
Figure 1:
a section through a schematically illustrated firing system with feed nozzles for recirculated exhaust gas;
Figure 2:
an enlarged section of a wall of a combustion chamber with inserted feed nozzles; and
Figure 3:
a section through a feed nozzle with a cleaning device according to the invention on an enlarged scale.

Figur 1 zeigt eine Feuerungsanlage mit einem Aufgabetrichter 1 mit anschließender Aufgabeschurre 2 für die Aufgabe des Brenngutes auf einen Aufgabetisch 3, auf dem Beschickkolben 4 vorgesehen sind, um das aus der Aufgabeschurre kommende Brenngut auf einen Feuerungsrost 5 aufzugeben. Unterhalb des Feuerungsrostes 5 ist eine insgesamt mit 6 bezeichnete Einrichtung zur Zuführung von Primärverbrennungsluft vorgesehen. Über dem Feuerungsrost 5 befindet sich ein Feuerraum 7, der im vorderen Teil in einen Abgaszug 8 übergeht, an den sich ein Abhitzkessel 9 und eine Abgasreinigungsanlage, bestehend aus einem Reaktor 10, d.h. einer chemischen Gasreinigungseinrichtung, und einem Filter 11 1 anschließen.FIG. 1 shows a furnace with a feed hopper 1 with subsequent chute 2 for the task of Fired goods on a feed table 3, on the loading piston 4 are provided to the coming from the feed chute Place the firing material on a grate 5. Below the Firing grate 5 is a total designated 6 device provided for the supply of primary combustion air. There is a combustion chamber 7 above the grate 5 which merges in the front part into an exhaust gas duct 8 to which a waste heat boiler 9 and an exhaust gas purification system from a reactor 10, i.e. a chemical gas cleaning device, and connect a filter 11 1.

Nach dieser Abgasreinigungsanlage wird Abgas für die Wiedereinführung in den Feuerraum abgesaugt. Hierfür ist in der Austrittsleitung des Filters 11 eine Absaugöffnung 12 vorgesehen, von der eine Absaugleitung 13 ausgeht, in die ein Ventilator 14 eingesetzt ist. Mit der Druckseite des Ventilators ist eine Leitung 15 verbunden, die die abgesaugte Abgasmenge einer Ringleitung 16 zuführt, aus der sogenannte Sekundärluftdüsen 17 gespeist werden, über die das abgesaugte Abgas dem Feuerraum 7 wieder zugeführt wird.After this exhaust gas purification system, exhaust gas is re-introduced sucked into the firebox. For this is in the Outlet line of the filter 11, a suction opening 12 is provided, from which a suction line 13 extends into which a fan 14 is inserted. With the pressure side of the fan is a line 15 connected to the amount of exhaust gas extracted feeds a ring line 16, from the so-called secondary air nozzles 17 are fed, via which the exhaust gas extracted is returned to the combustion chamber 7.

Wie aus den Figuren 2 und 3 ersichtlich, ist in der Wand 18 des Feuerraumes 7 innerhalb einer Nische 19 derselben eine Zuführungsdüse bzw. ein Zuführungsrohr 20 eingesetzt, wobei die Zuführungsdüse 20 über eine Flanschverbindung 21 mit einem insgesamt mit 22 bezeichneten Rohrverzweiger verbunden ist. Der Rohrverzweiger weist einerseits ein fluchtend mit der Zuführungsdüse 20 ausgerichtetes Rohr 23 und ein weiteres Rohr 24 auf, das mit der Ringleitung 16 für das zurückgeführte Abgas verbunden ist. Am Ende des mit der Zuführungsdüse 20 fluchtenden Rohres 23 ist ein Verschlußdeckel 25 vorgesehen, in dessen Zentrum eine Haltevorrichtung 26 für eine Lanze 27 vorgesehen ist. Die Haltevorrichtung 26 ist in der Lage, die Lanze 27 in ihrer Längsrichtung verschiebbar aufzunehmen. Am vorderen Ende der Lanze 27 ist ein Düsenkopf 28 vorgesehen. An dem dem Düsenkopf 28 gegenüberliegenden hinteren Ende der Lanze 27 ist eine Ventileinrichtung 29 angeordnet, an die eine Wasserzuführungsleitung in Form eines Schlauches 30 angeflanscht ist. Die Ventileinrichtung 29 steht über eine Leitung 31 mit einer Regeleinrichtung 32 in Verbindung, die in der Lage ist, die Zuführung von Wasser zur Lanze 27 hinsichtlich des Druckes und der Menge zu regeln und auch die Ventileinrichtung 29 abzusperren und zu öffnen, wobei auch die Zeitintervalle zwischen den Öffnungsphasen und die Länge der Öffnungsphasen durch die Regeleinrichtung 32 eingestellt werden können.As can be seen from FIGS. 2 and 3, there is 18 in the wall of the combustion chamber 7 within a niche 19 of the same Feed nozzle or a feed tube 20 is used, wherein the feed nozzle 20 via a flange connection 21 connected to a total of 22 designated manifolds is. The manifold has an aligned one hand the feed nozzle 20 aligned tube 23 and another Tube 24 on that with the ring line 16 for the returned Exhaust gas is connected. At the end of the feed nozzle 20 aligned tube 23, a closure cover 25 is provided, in the center of a holding device 26 for a Lance 27 is provided. The holding device 26 is in the Able to receive the lance 27 displaceably in its longitudinal direction. At the front end of the lance 27 is a nozzle head 28 intended. On the one opposite the nozzle head 28 a valve device 29 is arranged at the rear end of the lance 27, to which a water supply line in the form of a Hose 30 is flanged. The valve device 29 stands via a line 31 to a control device 32 in connection, which is able to supply water to the lance 27 regulate in terms of pressure and quantity and also to shut off and open the valve device 29, whereby also the time intervals between the opening phases and the Length of the opening phases set by the control device 32 can be.

Der am vorderen Ende der Lanze 27 vorgesehene Düsenkopf 28 ermöglicht ein Aussprühen von Wasser in Form eines kegelförmigen Wasserschleiers, wobei der Kegelwinkel einstellbar ist. Dieser Wasserschleier ist mit strichpunktierten Linien in Figur 3 angedeutet und mit dem Bezugszeichen 33 versehen. Mit gestrichelten Linien 34 sind Ablagerungen angedeutet, die sowohl im Inneren der Zuführungsdüse als auch an deren Außenseite in Erscheinung treten, wenn Abgas aus der Zuführungsdüse 20 in den Feuerraum 7 eingeblasen wird. Die Zeitdauer, in welcher sich solche Ablagerungen bilden, hängt von der Zusammensetzung des Abgases und auch davon ab, ob nur Abgas oder Abgas gemischt mit Umgebungsluft über die Zuführungsdüsen 20 in den Feuerraum 7 eingeführt wird.The nozzle head 28 provided at the front end of the lance 27 allows water to be sprayed out in the form of a conical Water curtain, the cone angle is adjustable. This water curtain is in figure with dash-dotted lines 3 indicated and provided with the reference number 33. With dashed lines Lines 34 depict deposits that are both inside the feed nozzle as well as on the outside thereof occur when exhaust gas from the supply nozzle 20 is blown into the combustion chamber 7. The length of time in which such deposits form depends on the composition of the exhaust gas and also depending on whether only exhaust gas or exhaust gas mixed with ambient air via the supply nozzles 20 is introduced into the combustion chamber 7.

Zur Entfernung dieser Ablagerungen 34 wird nun über die Lanze 27 Wasser eingeführt, wobei an dem in Strömungsrichtung der Abgase vorderen Rand 35 der Ablagerungen begonnen wird. Die Strömungsrichtung der Abgase ist mit dem Pfeil 36 gekennzeichnet. Das aufgesprühte Wasser dringt nun in die poröse Masse der Ablagerungen 34 ein und wird aufgrund der starken Wärmeeinstrahlung, die vom Feuerraum 7 in die Zuführungsdüse eindringt, schlagartig verdampft, so daß die Ablagerungen 34 von innen heraus von der Wandung der Zuführungsdüse 20 abgesprengt werden. Dabei werden durch die Absprengungen neu rauhe, das heißt poröse Bruchflächen geschaffen, in die das Wasser besonders gut eindringen kann.To remove these deposits 34 is now on Lance 27 introduced water, being in the direction of flow the exhaust gas front edge 35 of the deposits started becomes. The direction of flow of the exhaust gases is with arrow 36 characterized. The sprayed water now penetrates the porous mass of the deposits 34 and is due to the strong heat radiation from the combustion chamber 7 into the feed nozzle penetrates, evaporated suddenly, so that the deposits 34 from the inside out of the wall of the feed nozzle 20 are blown off. In doing so, the blasting newly rough, i.e. porous fracture surfaces created, into which the water can penetrate particularly well.

Claims (14)

  1. Method for the removal of deposits in and on supply nozzles or supply pipes of combustion installations, in which these deposits settle from recirculated exhaust gas which is supplied to a combustion space again, a liquid medium being applied to the deposits, characterized in that the liquid medium is sprayed in droplet form onto the deposits, and in that the medium is applied to the deposits in the direction of flow of the exhaust gases within the supply nozzles or supply pipes, commencing with the edge of the deposits which is at the front in the direction of flow of the exhaust gases within the supply nozzles or supply pipes.
  2. Method according to Claim 1, characterized in that the liquid medium is applied to the deposits in a fine distribution as a droplet mist.
  3. Method for the removal of deposits in and on supply nozzles or supply pipes of combustion installations, in which these deposits settle from recirculated exhaust gas which is supplied to a combustion space again, a vaporous medium being applied to the deposits, characterized in that the vaporous medium is applied to the deposits in the direction of flow of the exhaust gases within the supply nozzles or supply pipes, commencing with the edge of the deposits which is at the front in the direction of flow of the exhaust gases within the supply nozzles or supply pipes.
  4. Method according to Claim 1 or 2, characterized in that the liquid medium is water.
  5. Method according to Claim 3, characterized in that the vaporous medium is water vapour.
  6. Method according to one of Claims 1 to 5, characterized in that the medium is supplied concentrically to the supply nozzle or to the supply pipe.
  7. Method according to one of Claims 1 to 6, characterized in that the medium is supplied in the form of a conical cloud.
  8. Method according to Claim 7, characterized in that the cone angle of the medium cloud is adjustable from 10° to 180°.
  9. Method according to one of the preceding claims, characterized in that the pressure of the liquid medium corresponds to the pressure of a public water supply system and is preferably around 6 bar.
  10. Method according to one of Claims 1 to 9, characterized in that both the medium pressure and medium quantity and the supply time and the duration between two medium supply phases can be regulated.
  11. Device for carrying out the method according to one of Claims 1 to 10, characterized by a lance (27) which has a medium connection and which is arranged into the interior of a supply nozzle (20) or of a supply pipe for recirculated exhaust gas from a combustion installation, in such a way that part of the medium is sprayed against the supply nozzle (20) or the supply pipe through a nozzle head (28) arranged at the front end of the lance (27).
  12. Device according to Claim 11, characterized in that the spray angle of the nozzle head (28) is adjustable.
  13. Device according to Claim 11 or 12, characterized in that the lance (27) is held (26) inside the supply nozzle (20) or supply pipe so as to be displaceable in the longitudinal direction.
  14. Device according to one of Claims 11 to 13, characterized in that the supply line (30) to the lance (27) has provided in it a regulatable valve device (29) which is connected to a regulating device (32) for opening and shutting off the medium supply, for regulating the medium pressure and the medium quantity and for regulating the opening times and the intervals between two opening phases.
EP98105977A 1997-04-24 1998-04-01 Method and device for removing deposits from supply nozzles or conduits of combustion installations Expired - Lifetime EP0874196B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19717378 1997-04-24
DE19717378A DE19717378A1 (en) 1997-04-24 1997-04-24 Method and device for removing deposits in and on feed nozzles or feed pipes of combustion plants

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EP0874196A3 EP0874196A3 (en) 1999-11-03
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JP (1) JP2868761B2 (en)
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CA2234804C (en) 2004-06-08
PL325947A1 (en) 1998-10-26
DK0874196T3 (en) 2003-02-17
EP0874196A2 (en) 1998-10-28
NO981805D0 (en) 1998-04-22
JP2868761B2 (en) 1999-03-10
PT874196E (en) 2003-03-31
SG75832A1 (en) 2000-10-24
NO981805L (en) 1998-10-26
DE19717378A1 (en) 1998-10-29
EP0874196A3 (en) 1999-11-03
ATE226706T1 (en) 2002-11-15
PL191420B1 (en) 2006-05-31
ES2184159T3 (en) 2003-04-01
TW346533B (en) 1998-12-01
CZ288190B6 (en) 2001-05-16
DE59806011D1 (en) 2002-11-28
CA2234804A1 (en) 1998-10-24
CZ124898A3 (en) 1999-02-17
BR9801429A (en) 1999-03-30
JPH10306913A (en) 1998-11-17
UA41463C2 (en) 2001-09-17
RU2143087C1 (en) 1999-12-20
US6105590A (en) 2000-08-22
NO312982B1 (en) 2002-07-22

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