US3742916A - Arrangement for cleaning an air passage in the wall of a refuse burning furnace - Google Patents

Arrangement for cleaning an air passage in the wall of a refuse burning furnace Download PDF

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Publication number
US3742916A
US3742916A US00198382A US3742916DA US3742916A US 3742916 A US3742916 A US 3742916A US 00198382 A US00198382 A US 00198382A US 3742916D A US3742916D A US 3742916DA US 3742916 A US3742916 A US 3742916A
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United States
Prior art keywords
passage
sleeve
wall
air
arrangement
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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
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US00198382A
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English (en)
Inventor
J Wessberg
K Astrom
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Gotaverken Angteknik AB
Goetaverken Angteknik AB
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Gotaverken Angteknik AB
Goetaverken Angteknik AB
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Publication of US3742916A publication Critical patent/US3742916A/en
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Expired - Lifetime legal-status Critical Current

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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
    • 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 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls

Definitions

  • Waste liquor from the processing of cellulose pulp is usually burnt in a recovery furnace to which the liquid is continuously supplied by means of one or more nozzles, which spray the liquor into the furnace in such a manner that part thereof will burn in suspension whereas the remainder adheres the walls of the furnace, where it is dehydrated and finally falls down into the hearth, where it forms a mound of dried matter where the final combustion occurs.
  • combustion air is supplied at several levels in the furnace.
  • An aim is to maintain the combustion as uniformly as possible over the cross sectional area of the furnace. This will result in a more complete combustion and a better heat recovery, and also minimizes the formation of H 8, will cause a nauseating smell in the surroundings, and with high concentration will accelerate the corrosion on the pressure parts of the furnace, especially in the lower portion thereof.
  • the air is distributed by means of wind boxes located at different levels outside the walls of the furnace, and from which the air is conveyed by means of a number of passages in the tube walls of the furnace.
  • the air from a common supply conduit is distributed by way of rows of separate pipes, with each ends at a wall passage.
  • these passages are distributed over the wall surface in principally the same manner.
  • each wind box is usually provided with throttling means in its supply conduits.
  • Such throttling means may also be provided at the supply conduit to a group of pipes leading to individual passages.
  • Each passage may furthermore be provided with its own throttling means to make possible a selected distribution of the air within each wind box, or within each groups of pipes, respectively, and to maintain the desired air pressure ahead of the passages.
  • the complicated arrangement for the supply of combustion air above described is desirable because it is difficult to obtain an uniform distribution of the liquor over the cross sectional area of the furnace and because the operating conditions for the nozzles, and therefore also the requirement upon the distribution of the air, will vary depending upon the load on the furnace and also upon the moisture content of the liquor to be sprayed.
  • the type of fuel actual, viz. waste liquor, and the manner of supplying the same to the furnace results in the build up of heavy coatings on the walls of the furnace, which tend to clogg the openings of the air passages into the furnace.
  • the aim of the present invention is to eliminate, or largely to reduce the problems encountered by the clogging in and around the air passages, and it is characterized in a sleeve mounted in each passage, being shorter than the latter and shaped substantially to follow the internal cross section of the passage, as well as in means for imparting a forwards and backwards oscillating movement to the sleeve.
  • sleeves in a number of passages within a series of passages are interconnected by means of a common actuating member. This latter is operatively associated with a driving means.
  • the driving means is automatically actuated at pre-determined intervals by means of a governor, the activation at each occurrence being effected to perform a certain number of strokes.
  • FIG. 1 is a perspective view of part of the furnace wall surrounding an air passage having a sleeve mounting therein,
  • FIG. 2 shows a corresponding part of the wall as viewed in a vertical section
  • FIG. 3 shows the arrangement on a larger scale and including more details
  • FIG. 4 illustrates the preferred form of the invention in which certain sleeves are interconnected by means of a common actuating member, a driving means and a governor for automatically activating said driving means.
  • the walls of the furnace consist of water cooled tubes 10, which form part of a steam boiler and the faces of which turned towards the furnace are covered with blocks of heat and corrosion resistant material and/or by a refractory compound.
  • the desired air passages are obtained by bending apart two adjacent tubes. The passages will thus obtain an elongated form.
  • the passage proper is formed as a housing 11, the outer shape of which corresponds to the opening obtained between the two tubes, and which will sealingly engage in the opening.
  • the housing is open towards a wind box 12 mounted at the outside of the wall, and it is evident that a number of similar passages are connected to this box, which is supplied with heated air from a suitable source.
  • an inspection opening 14 provided with a window of heat resistant material, as well as a further opening 15, provided with a lid 16, pivotably supported about its upper edge.
  • a lance may be introduced into the air passage 11, ifit, as a result of a damage to the operating mechanism, will become necessary manually to break up deposits formed within air passage.
  • a throttling member 17 At the inlet end of the air passage there is a throttling member 17 by means of which the volume of air can be adjusted individually for each passage.
  • FIGS. 1 and 2 show the sleeve in its rest position, in which it is retracted as far back as to the throttling member 17.
  • a link mechanism 19 By means of a link mechanism 19, 20 a forwards and backwards oscillating movement is imparted to the sleeve from a motor 21, which might be a compressed air unit, the piston rod 22 of which is connected to link 20.
  • the movement of the mechanism is selected in such a manner, that the sleeve will be brought forwards until the edge of, orjust outside the edge of the air passage. During this forward movement it will remove any matter deposited within the passage.
  • the sleeves at a number of passages located adjacent to each other preferably are connected to a common driving means 21, which may be governed by means well known in the art to be automatically activated at predetermined intervals, and which on each occasion will perform a certain number of strokes,
  • FIG. 3 The design of the air passage and of the sleeve therein is shown more in detail in FIG. 3.
  • the internal wall of the passage housing is provided with a number of axially directed ledges 23, which support the sleeve during its movements and reduce the contact face between the latter and the wall of the passage.
  • This is furthermore provided with a number of openings 24, which by conduits not shown in the drawing are connected to the air wind box 12, so a limited amount of air will constantly flow to the clearance between the housing of the air passage and the sleeve in order to cool the latter.
  • the sleeve is provided with two sidewardly directed pegs 25, which pass through elongated slots in the housing of the passage, and which are connected to the links 19 in such a manner that a transfer of the movements to the sleeve may be arranged without changing the position of the throttling member 17. It is apparent that the sleeve actually will be the determining factor for the volume of air, but through the arrangement shown the volume of air to each passage will not be influenced by the occasional position of the sleeve within the passage. If the actuating mechanism should be put out of action as a result of some damage the arrangement due to the lancing openings will be fully equivalent to that of conventional air passages lacking the cleaning means according to the invention.
  • a scraper ring 26 is fitted within sleeve 18 is mounted on a number of pegs 27, which pass elongated slots 28 in the sleeve and are fixedly mounted in the housing.
  • the scraper ring thus, will maintain a fixed position during the displacement of the sleeve, and it is mounted just inside the position held by the edge of the sleeve turned towards the furnace, when the sleeve is withdrawn to its rest position. Deposited matter, which during the outward movement of the sleeve is pushed into the latter will be removed by the scraper ring during each retracting movement, so it will again fall down into the air passage, and during the following outward movement of the sleeve be pushed out of the passage.
  • FIG. 4 there is shown a repetition of the organization illustrated in FIG.
  • An arrangement for cleaning an air passage in the wall of a refuse burning furnace comprising a sleeve mounted within the passage, being shorter than the latter and shaped substantially to follow the internal cross section of the passage, and
  • the internal wall of the passage being provided with elongated ledges serving to govern the movements of the sleeve with a clearance with respect to the wall of the passage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Paper (AREA)
US00198382A 1971-01-07 1971-11-12 Arrangement for cleaning an air passage in the wall of a refuse burning furnace Expired - Lifetime US3742916A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE00092/71A SE349132B (xx) 1971-01-07 1971-01-07

Publications (1)

Publication Number Publication Date
US3742916A true US3742916A (en) 1973-07-03

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US00198382A Expired - Lifetime US3742916A (en) 1971-01-07 1971-11-12 Arrangement for cleaning an air passage in the wall of a refuse burning furnace

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US (1) US3742916A (xx)
FI (1) FI56068C (xx)
SE (1) SE349132B (xx)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2220754A1 (xx) * 1973-03-05 1974-10-04 Goetaverken Angteknik Ab
US3900011A (en) * 1973-05-25 1975-08-19 Goetaverken Angteknik Ab Air supply means for a furnace
US3920377A (en) * 1973-07-12 1975-11-18 Ishikawajima Harima Heavy Ind Combustion apparatus
US3943861A (en) * 1974-01-30 1976-03-16 Gotaverken Angteknik Ab Device for operating air governing means at a refuse burning furnace
US4027604A (en) * 1974-10-07 1977-06-07 Gotaverken Angteknik Ab Means for governing the air supply to a furnace
FR2332497A1 (fr) * 1975-11-24 1977-06-17 Combustion Eng Equipement de nettoyage des buses d'air d'une chambre de combustion
FR2528542A1 (fr) * 1982-06-09 1983-12-16 Goodspeed Byron Dispositif de nettoyage d'une ouverture de foyer
US4554320A (en) * 1982-05-29 1985-11-19 Basf Aktiengesellschaft Nylon molding materials having high impact strength
EP0192382A2 (en) * 1985-02-13 1986-08-27 Lt-Produkter Skutskar AB Apparatus for regulating and cleaning an air passage in the wall of a furnace
US4837264A (en) * 1987-01-08 1989-06-06 Basf Aktiengesellschaft Polyamide compositions containing alkyl orthotitanate or dialkyltin dilaurate
US4940004A (en) * 1989-07-07 1990-07-10 J. H. Jansen Company, Inc. High energy combustion air nozzle and method for improving combustion in chemical recovery boilers
US5034450A (en) * 1988-02-27 1991-07-23 Basf Aktiengesellschaft Thermoplastic molding materials based on polyamides and polyester elastomers
EP0461747A2 (en) * 1990-06-13 1991-12-18 The Babcock & Wilcox Company Auxiliary port cleaner for boiler wall sensing port
US5528999A (en) * 1993-01-21 1996-06-25 Tampella Power Oy Air nozzle for a recovery boiler
WO1999045323A1 (en) * 1998-03-05 1999-09-10 LT-Produkter Skutskär AB A device for regulating and cleaning an air intake
US6055943A (en) * 1997-09-25 2000-05-02 Anthony-Ross Company Air port casting
WO2001061248A1 (en) * 2000-02-18 2001-08-23 Kvaerner Pulping Ab Arrangement for cleaning, airflow control and pushing away melt in air ports of incineration boilers
EP1646827A2 (en) * 2003-06-12 2006-04-19 Clyde Bergemman, Inc. Automatic combustion air port cleaner with air/oil indexing mechanism
US20090272339A1 (en) * 2004-10-27 2009-11-05 Andritz Oy Cooling system for ports in a boiler
WO2021186100A1 (en) * 2020-03-19 2021-09-23 Im Serco Oy Hybrid nozzle
US11226095B2 (en) 2019-01-28 2022-01-18 Andritz Inc. Velocity damper for a recovery boiler
US11982446B2 (en) 2020-08-18 2024-05-14 Tyler K C Kimberlin Optimized overfire air nozzles, system and strategy

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2161110A (en) * 1935-05-16 1939-06-06 Babcock & Wilcox Co Method of and apparatus for burning waste liquor
US2244079A (en) * 1940-11-04 1941-06-03 Phillip C Hall Punching device
US2480394A (en) * 1947-02-07 1949-08-30 Falconbridge Nickel Mines Ltd Punching pipe for converter tuyeres
US2696979A (en) * 1951-04-16 1954-12-14 Kennecott Copper Corp Automatic tuyere punching apparatus
US3361419A (en) * 1966-05-10 1968-01-02 Selas Corp Of America Air preheating burner with furnace preheating passage cleaner means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2161110A (en) * 1935-05-16 1939-06-06 Babcock & Wilcox Co Method of and apparatus for burning waste liquor
US2244079A (en) * 1940-11-04 1941-06-03 Phillip C Hall Punching device
US2480394A (en) * 1947-02-07 1949-08-30 Falconbridge Nickel Mines Ltd Punching pipe for converter tuyeres
US2696979A (en) * 1951-04-16 1954-12-14 Kennecott Copper Corp Automatic tuyere punching apparatus
US3361419A (en) * 1966-05-10 1968-01-02 Selas Corp Of America Air preheating burner with furnace preheating passage cleaner means

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875904A (en) * 1973-03-05 1975-04-08 Goetaverken Angteknik Ab Device for cleaning air passage openings in the walls of a refuse burning furnace
FR2220754A1 (xx) * 1973-03-05 1974-10-04 Goetaverken Angteknik Ab
US3900011A (en) * 1973-05-25 1975-08-19 Goetaverken Angteknik Ab Air supply means for a furnace
US3920377A (en) * 1973-07-12 1975-11-18 Ishikawajima Harima Heavy Ind Combustion apparatus
US3943861A (en) * 1974-01-30 1976-03-16 Gotaverken Angteknik Ab Device for operating air governing means at a refuse burning furnace
US4027604A (en) * 1974-10-07 1977-06-07 Gotaverken Angteknik Ab Means for governing the air supply to a furnace
FR2332497A1 (fr) * 1975-11-24 1977-06-17 Combustion Eng Equipement de nettoyage des buses d'air d'une chambre de combustion
US4099471A (en) * 1975-11-24 1978-07-11 Combustion Engineering, Inc. Apparatus for cleaning the air nozzles and regulating air flow thereto in chemical recovery boilers
US4554320A (en) * 1982-05-29 1985-11-19 Basf Aktiengesellschaft Nylon molding materials having high impact strength
FR2528542A1 (fr) * 1982-06-09 1983-12-16 Goodspeed Byron Dispositif de nettoyage d'une ouverture de foyer
EP0192382A2 (en) * 1985-02-13 1986-08-27 Lt-Produkter Skutskar AB Apparatus for regulating and cleaning an air passage in the wall of a furnace
US4653409A (en) * 1985-02-13 1987-03-31 Lt-Produkter Skutskar Ab Apparatus for regulating and cleaning an air passage in the wall of a furnace
EP0192382A3 (en) * 1985-02-13 1988-03-16 Lt-Produkter Skutskar AB Apparatus for regulating and cleaning an air passage in the wall of a furnace
US4837264A (en) * 1987-01-08 1989-06-06 Basf Aktiengesellschaft Polyamide compositions containing alkyl orthotitanate or dialkyltin dilaurate
US5034450A (en) * 1988-02-27 1991-07-23 Basf Aktiengesellschaft Thermoplastic molding materials based on polyamides and polyester elastomers
US4940004A (en) * 1989-07-07 1990-07-10 J. H. Jansen Company, Inc. High energy combustion air nozzle and method for improving combustion in chemical recovery boilers
EP0461747A2 (en) * 1990-06-13 1991-12-18 The Babcock & Wilcox Company Auxiliary port cleaner for boiler wall sensing port
EP0461747A3 (en) * 1990-06-13 1992-04-22 The Babcock & Wilcox Company Auxiliary port cleaner for boiler wall sensing port
US5528999A (en) * 1993-01-21 1996-06-25 Tampella Power Oy Air nozzle for a recovery boiler
US6055943A (en) * 1997-09-25 2000-05-02 Anthony-Ross Company Air port casting
US6431125B1 (en) 1998-03-05 2002-08-13 LT-Produkter Skutskär AB Device for regulating and cleaning an air intake
WO1999045323A1 (en) * 1998-03-05 1999-09-10 LT-Produkter Skutskär AB A device for regulating and cleaning an air intake
US6672227B2 (en) * 2000-02-18 2004-01-06 Kvaerner Pulping Ab Arrangement for cleaning, airflow control and pushing away melt in air ports of incineration boilers
WO2001061248A1 (en) * 2000-02-18 2001-08-23 Kvaerner Pulping Ab Arrangement for cleaning, airflow control and pushing away melt in air ports of incineration boilers
EP1646827A2 (en) * 2003-06-12 2006-04-19 Clyde Bergemman, Inc. Automatic combustion air port cleaner with air/oil indexing mechanism
EP1646827A4 (en) * 2003-06-12 2011-07-06 Clyde Bergemman Inc AUTOMATIC COMBUSTION AIR NOZZLE CLEANING APPARATUS HAVING AN AIR / OIL INDEXING MECHANISM
US20090272339A1 (en) * 2004-10-27 2009-11-05 Andritz Oy Cooling system for ports in a boiler
US8707911B2 (en) * 2004-10-27 2014-04-29 Andritz Oy Cooling system for ports in a boiler
US11226095B2 (en) 2019-01-28 2022-01-18 Andritz Inc. Velocity damper for a recovery boiler
US11719433B2 (en) 2019-01-28 2023-08-08 Andritz Inc. Velocity damper for a recovery boiler
WO2021186100A1 (en) * 2020-03-19 2021-09-23 Im Serco Oy Hybrid nozzle
US11982446B2 (en) 2020-08-18 2024-05-14 Tyler K C Kimberlin Optimized overfire air nozzles, system and strategy

Also Published As

Publication number Publication date
FI56068C (fi) 1979-11-12
SE349132B (xx) 1972-09-18
FI56068B (fi) 1979-07-31
SU401035A3 (xx) 1973-10-01

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