EP0874196B1 - Verfahren und Vorrichtung zum Entfernen von Ablagerungen in und an Zuführungsdüsen oder Zuführungsrohren von Feuerungsanlagen - Google Patents

Verfahren und Vorrichtung zum Entfernen von Ablagerungen in und an Zuführungsdüsen oder Zuführungsrohren von Feuerungsanlagen 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
Authority
EP
European Patent Office
Prior art keywords
medium
deposits
supply
feed
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98105977A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0874196A2 (de
EP0874196A3 (de
Inventor
Johannes Josef Edmund Dipl.-Ing. Martin
Peter Spichal
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.)
Martin GmbH fuer Umwelt und Energietechnik
Original Assignee
Martin GmbH fuer Umwelt und Energietechnik
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 Martin GmbH fuer Umwelt und Energietechnik filed Critical Martin GmbH fuer Umwelt und Energietechnik
Publication of EP0874196A2 publication Critical patent/EP0874196A2/de
Publication of EP0874196A3 publication Critical patent/EP0874196A3/de
Application granted granted Critical
Publication of EP0874196B1 publication Critical patent/EP0874196B1/de
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
    • 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.

Landscapes

  • 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)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Physical Vapour Deposition (AREA)
  • Air Supply (AREA)
  • Processing Of Solid Wastes (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP98105977A 1997-04-24 1998-04-01 Verfahren und Vorrichtung zum Entfernen von Ablagerungen in und an Zuführungsdüsen oder Zuführungsrohren von Feuerungsanlagen Expired - Lifetime EP0874196B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19717378 1997-04-24
DE19717378A DE19717378A1 (de) 1997-04-24 1997-04-24 Verfahren und Vorrichtung zum Entfernen von Ablagerungen in und an Zuführungsdüsen oder Zuführungsrohren von Feuerungsanlagen

Publications (3)

Publication Number Publication Date
EP0874196A2 EP0874196A2 (de) 1998-10-28
EP0874196A3 EP0874196A3 (de) 1999-11-03
EP0874196B1 true EP0874196B1 (de) 2002-10-23

Family

ID=7827652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98105977A Expired - Lifetime EP0874196B1 (de) 1997-04-24 1998-04-01 Verfahren und Vorrichtung zum Entfernen von Ablagerungen in und an Zuführungsdüsen oder Zuführungsrohren von Feuerungsanlagen

Country Status (17)

Country Link
US (1) US6105590A (pt)
EP (1) EP0874196B1 (pt)
JP (1) JP2868761B2 (pt)
AT (1) ATE226706T1 (pt)
BR (1) BR9801429A (pt)
CA (1) CA2234804C (pt)
CZ (1) CZ288190B6 (pt)
DE (2) DE19717378A1 (pt)
DK (1) DK0874196T3 (pt)
ES (1) ES2184159T3 (pt)
NO (1) NO312982B1 (pt)
PL (1) PL191420B1 (pt)
PT (1) PT874196E (pt)
RU (1) RU2143087C1 (pt)
SG (1) SG75832A1 (pt)
TW (1) TW346533B (pt)
UA (1) UA41463C2 (pt)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022351A1 (de) * 2000-05-08 2001-11-29 Erik Riedel Verfahren zur Ablagerungsbeseitigung in Brennräumen thermischer Anlagen während des laufenden Betriebs
DE102004060884A1 (de) * 2004-12-17 2006-06-29 Clyde Bergemann Gmbh Verfahren und Vorrichtung zum Entfernen von Verbrennungsrückständen mit unterschiedlichen Reinigungsmedien
US8381690B2 (en) * 2007-12-17 2013-02-26 International Paper Company Controlling cooling flow in a sootblower based on lance tube temperature
JP5352096B2 (ja) * 2008-02-29 2013-11-27 三菱重工環境・化学エンジニアリング株式会社 燃焼炉及び堆積物除去機構
JP5535506B2 (ja) * 2009-03-23 2014-07-02 三菱重工環境・化学エンジニアリング株式会社 ストーカ式焼却炉のノズル清掃装置
CN101876447B (zh) * 2010-07-01 2012-10-10 中国石油化工股份有限公司 一种吹灰器
EP2447607A1 (en) * 2010-10-28 2012-05-02 Wgm-Waste Gasification & Melting Sa Device for removing solid combustion deposits inside combustion or gasification ovens
GB201312870D0 (en) * 2013-07-18 2013-09-04 Charlton & Jenrick Ltd Fire constructions
US9541282B2 (en) 2014-03-10 2017-01-10 International Paper Company Boiler system controlling fuel to a furnace based on temperature of a structure in a superheater section
US9927231B2 (en) * 2014-07-25 2018-03-27 Integrated Test & Measurement (ITM), LLC System and methods for detecting, monitoring, and removing deposits on boiler heat exchanger surfaces using vibrational analysis
PL3172520T3 (pl) 2014-07-25 2019-07-31 International Paper Company System i sposób określania lokalizacji zanieczyszczenia na powierzchni przenoszenia ciepła kotła
CN104595882B (zh) * 2015-01-19 2016-06-08 浙江徐氏厨房设备有限公司 燃气蒸汽发生器除垢装置
CN105750256A (zh) * 2016-05-14 2016-07-13 淮安美妙电子科技有限公司 一种可预排气的高压清洗机

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US2394760A (en) * 1944-03-01 1946-02-12 Ora E Felton Slag cleaning tool
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DE3148225A1 (de) * 1981-12-05 1983-06-09 Elmar Michael Dipl.-Ing. 4150 Krefeld Veltrup Vorrichtung zum reinigen von rohren
JPS59109713A (ja) * 1982-12-14 1984-06-25 Mitsubishi Heavy Ind Ltd 燃焼炉の空気口自動掃除装置
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Also Published As

Publication number Publication date
JP2868761B2 (ja) 1999-03-10
TW346533B (en) 1998-12-01
UA41463C2 (uk) 2001-09-17
ATE226706T1 (de) 2002-11-15
DK0874196T3 (da) 2003-02-17
SG75832A1 (en) 2000-10-24
DE59806011D1 (de) 2002-11-28
BR9801429A (pt) 1999-03-30
CZ288190B6 (en) 2001-05-16
JPH10306913A (ja) 1998-11-17
PL191420B1 (pl) 2006-05-31
PT874196E (pt) 2003-03-31
PL325947A1 (en) 1998-10-26
NO981805D0 (no) 1998-04-22
CA2234804C (en) 2004-06-08
NO312982B1 (no) 2002-07-22
EP0874196A2 (de) 1998-10-28
ES2184159T3 (es) 2003-04-01
CA2234804A1 (en) 1998-10-24
US6105590A (en) 2000-08-22
DE19717378A1 (de) 1998-10-29
RU2143087C1 (ru) 1999-12-20
CZ124898A3 (cs) 1999-02-17
EP0874196A3 (de) 1999-11-03
NO981805L (no) 1998-10-26

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