EP2664847B1 - Kesselvorrichtung - Google Patents

Kesselvorrichtung Download PDF

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Publication number
EP2664847B1
EP2664847B1 EP12734688.0A EP12734688A EP2664847B1 EP 2664847 B1 EP2664847 B1 EP 2664847B1 EP 12734688 A EP12734688 A EP 12734688A EP 2664847 B1 EP2664847 B1 EP 2664847B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
air supply
air
furnace
supply 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.)
Not-in-force
Application number
EP12734688.0A
Other languages
English (en)
French (fr)
Other versions
EP2664847A1 (de
EP2664847A4 (de
Inventor
Akihito Orii
Hirofumi Okazaki
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.)
Mitsubishi Power Ltd
Original Assignee
Mitsubishi Hitachi Power Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Hitachi Power Systems Ltd filed Critical Mitsubishi Hitachi Power Systems Ltd
Publication of EP2664847A1 publication Critical patent/EP2664847A1/de
Publication of EP2664847A4 publication Critical patent/EP2664847A4/de
Application granted granted Critical
Publication of EP2664847B1 publication Critical patent/EP2664847B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/02—Disposition of air supply not passing through burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00—Staged combustion
    • F23C2201/10—Furnace staging
    • F23C2201/101—Furnace staging in vertical direction, e.g. alternating lean and rich zones
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/06041—Staged supply of oxidant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/07021—Details of lances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20—Fuel flow guiding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/01001—Pulverised solid fuel burner with means for swirling the fuel-air mixture

Definitions

  • the present invention relates to boilers and in particular to a boiler having an air supply nozzle which supplies air into a furnace.
  • a pulverized coal burning boiler in which coal is pulverized and suspended and burned in a furnace is configured as disclosed in, for example, Japanese Unexamined Patent Application Publication No. Hei 9(1997)-310807 .
  • the boiler furnace is provided at the lower part thereof with a pulverized coal burner and an after-air nozzle is provided downstream of the burner (upper part of the boiler). Pulverized coal fuel and combustion air are supplied from the burner and only air is supplied from the after-air nozzle.
  • Combustion at the burner portion is carried out as described below. Air in such a quantity or less that an excess air ratio required for the complete combustion of pulverized coal fuel is obtained is supplied from the burner. Thus the pulverized coal is burned in the shortage of air to create a reducing atmosphere and the production of NOx is thereby suppressed. In the reducing atmosphere, unburned components are left because of the shortage of oxygen and CO (carbon monoxide) is produced. To completely burn the unburned components and CO produced in the reducing atmosphere, the following measure is taken: combustion air in a quantity slightly larger than the air quantity equivalent to the insufficient excess air ratio is supplied into the furnace from the after-air nozzle positioned downstream of the burner. As a result, combustion exhaust gas with reduced unburned components and CO is discharged from the furnace.
  • a recessed furnace lance purge gas system comprises a nozzle that injects a high velocity main gas into a furnace.
  • the nozzle is located in a passage recessed from the exit port opening of the passage which communicates with the combustion zone.
  • an overfiring air port for a boiler is described.
  • the overfiring air port is supplied to an incomplete combustion region with air making up for combustion shortage in a furnace in which the incomplete combustion region is formed.
  • DE743173C an equipment for blowing air into the combustion chamber using a plurality of nozzles is described.
  • the secondary air is blown into the combustion chamber by using cascaded nozzles wherein the entrance and exit cross-sectional areas of the air channels of the nozzles is arranged such that the exit velocity of the secondary air has a maximum in the middle nozzle channel and is decreasing at the outer nozzle channels.
  • pulverized coal burning boilers It is important for combustion equipment such as pulverized coal burning boilers and oil burning boilers to completely burn fuel. For this reason, to implement complete combustion by supplying air from an after-air nozzle positioned downstream of a burner as in, for example, the above-mentioned pulverized coal burning boiler, it is desirable to take the following measure: air is evenly distributed in the furnace to facilitate mixing with unburned components. In this case, in addition to supplying air to the center of the furnace, it is necessary to supply air to the proximity of a furnace wall to reduce the unburned components in fuel in the proximity of the furnace wall.
  • One of means for supplying air to the proximity of a furnace wall is a method of swirling air in a nozzle and supplying it into the furnace as a swirl flow.
  • Japanese Unexamined Patent Application Publication No. Hei 4(1992)-52414 discloses a swirl structure in which air is given a straight flow and a swirl flow to facilitate mixing by adjusting the flow mode of an after-air jet.
  • the ratio of swirl flow is increased and air is diffused by centrifugal force after the air is blown out of the nozzle.
  • the furnace wall which is a partition wall comprising the furnace of the boiler is thermally expanded with rise in in-furnace temperature.
  • a furnace has its upper part supported and is suspended. For this reason, its furnace wall is moved downward by thermal expansion.
  • a furnace is supported at its lower part, its furnace wall is moved upward by thermal expansion.
  • an air supply nozzle such as an after-air nozzle is not brought into tight contact with a through hole communicating with the interior of the furnace and is provided with a gap.
  • a through hole in the furnace wall moved by thermal expansion is not brought into contact or does not interfere with the air supply nozzle fixed in the foundation of the equipment.
  • the interior of the furnace is controlled under negative pressure to prevent combustion gas from flowing out of the furnace. Air flows as a leak flow from this gap into the furnace. Since the leak flow goes straight into the furnace, it works in the direction in which a swirl flow is hindered and this makes it difficult to form a strong wall surface flow along the wall. Even when a structure (seal member) is provided between the air supply nozzle and the furnace wall for the prevention of the inflow of air, the following problem arises: in a stepped portion produced between the air supply nozzle and the furnace wall, a flow path is abruptly expanded; therefore, a flow is separated from the wall surface and a circulating flow is produced to prevent air jetting out of the nozzle from flowing along the wall surface. This makes it difficult to form a flow along the furnace wall surface and air is not sufficiently supplied to the proximity of the furnace wall and unburned components can be left.
  • Japanese Unexamined Patent Application Publication No. 2009-174751 discloses a nozzle which jets out air along a waterwall.
  • a component member is protruded into the furnace and the nozzle member can be burned by radiant heat from a burner flame and this can prevent a required air jet from being formed.
  • An object of the invention is to provide an air supply nozzle with improved soundness and a boiler with improved reliability and cost efficiency.
  • the air supply nozzle the following can be implemented even when there is a gap between the nozzle provided in a through hole in a furnace wall communicating with the interior of a furnace and the through hole: it is possible to form a strong swirl flow and a wall surface flow on a furnace inner wall surface and burnout of the nozzle due to radiant heat is suppressed.
  • a boiler including an air supply nozzle is characterized in that it has an expanded structure in which the cross-sectional area of the tip portion of the nozzle is increased toward the downstream side.
  • a boiler including an air supply nozzle is characterized in that the nozzle is provided therein with a cylindrical expanded member whose cross-sectional area is increased toward the downstream side.
  • a boiler including an air supply nozzle is characterized in that the tip of the nozzle is provided with a projected and depressed member.
  • a boiler including an air supply nozzle is characterized in that a through hole has an expanded structure on the furnace inner surface side.
  • a boiler including an air supply nozzle is characterized in that an adjusting member is provided for adjusting the tangential velocity component of air.
  • a boiler including an air supply nozzle is characterized in that the air supply nozzle is provided on the downstream side of the burner.
  • a boiler including an air supply nozzle is characterized in that: a nozzle for supplying a shortage of combustion air in a burner into a furnace is provided in at least two or more stages on the downstream side of the burner; and the air supply nozzle is provided as part of the nozzles.
  • a boiler including an air supply nozzle is characterized in that the air supply nozzle is provided at the height at which a burner is placed.
  • the tip of a nozzle is installed at a distance of 0.8D or more from a furnace wall inner surface. Therefore, a flow jetted out of the nozzle is gradually expanded in the radial direction and goes along the inner wall of a through hole on the upstream side of the outlet of a through hole. It is further expanded at the outlet of the through hole and goes along the furnace wall inner surface over the surface of a water pipe.
  • an air supply nozzle of the invention When an air supply nozzle of the invention is installed downstream of a burner, a sufficient quantity of oxygen can be supplied to the proximity of a wall and unburned components and CO existing in the proximity of the wall are reduced in quantity. When it is installed at the height at which a burner is placed, oxygen can be supplied along the surface of a furnace wall to suppress corrosion. Further, since the nozzle is not protruded into the furnace, burnout of the nozzle due to radiant heat can be suppressed and a reliable and cost-effective boiler can be provided.
  • FIG. 1 is a front view of an air supply nozzle 4 in an embodiment of the invention and FIG. 2 is a schematic diagram showing a section taken along line A-A of FIG. 1 .
  • a water pipe 11 is provided on the surface of a furnace wall 1 and the water pipe 11 is also deformed in accordance with the shape of a through hole 30 and placed so as not to interfere with the circular through hole 30.
  • the furnace wall 1 is elongated downward by thermal expansion due to heat in the furnace; therefore, a gap 24 is provided between the outside diameter of a nozzle 20 installed in the through hole 30 and the inside diameter of the through hole 30.
  • a circular swirl vane 25 is installed as an air swirling member.
  • a duct 16 is so configured that it can supply air 15 from the through hole 30 into the furnace through the nozzle 20.
  • the air 15 goes through the duct 16 and flows in from an inflow port 22 provided in the nozzle 20. It is turned into a swirl flow having the velocity of flow of a tangential velocity component by the swirl vane 25 and flows out from the tip of the nozzle 20 and flows from the through hole 30 into the furnace.
  • the air flow rate is adjusted by the opening of a damper 21.
  • the furnace wall 1 and the duct 16 are brought into tight contact with each other so that the full quantity of air 15 flows into the furnace; however, there is a gap 26 between the duct 16 and the furnace wall 1.
  • the interior of the furnace is constantly controlled under negative pressure during operation so as to prevent combustion gas from getting out of the furnace. Consequently, there is a leak flow 23 formed by air flowing in from the gap 26 and jetting out from the gap 24 into the furnace. Since this leak flow 23 is a straight flow going into the furnace, it hinders a wall surface flow along the wall formed by a strong swirl flow jetting out of the nozzle 20. Even when seal is implemented by a seal member 27 which prevents the inflow of air to suppress the leak flow 23, the following problem is caused because of the presence of the gap 24: a circulating flow 31 is produced at the tip of the nozzle 20 and prevents a swirl flow jetting out of the nozzle 20 from going along the wall surface.
  • FIG. 3 indicates the influence of the presence or absence of the gap 24 on a jet.
  • the horizontal axis indicates the value obtained by dividing the distance L from the tip of the nozzle 20 illustrated in FIG. 2 to the inner surface of the furnace wall 1 by the inside diameter D of the nozzle 20 (L/D).
  • the vertical axis indicates the presence or absence of the gap 24.
  • O in the drawing indicates that a wall surface flow formed by a jet jetting out of the through hole 30 along the wall is formed and X indicates that a wall surface flow is not formed.
  • the hatched area H in the drawing indicates a region where a wall surface flow is formed and F indicates a non-wall surface flow region. Even in region F in the drawing, a wall surface flow may be temporarily formed in some cases; however, when disturbance due to pressure fluctuation in the furnace or the like is given, the wall surface flow cannot be stably maintained. Under the conditions of region H, a wall surface flow can be formed without the influence of these disturbances. From FIG.
  • FIG. 4 is a schematic diagram of a jet obtained when a wall surface flow equivalent to region H in FIG. 3 is formed.
  • the position of the tip of the nozzle 20 is located sufficiently, or 0.8D or more, away from the inner surface of the furnace wall 1. For this reason, a swirl flow jetting out of the nozzle is gradually expanded in the radial direction. It suppresses the leak flow 23 and the circulating flow 31 and is further expanded at the outlet of the through hole 30, turned into a wall surface flow going along the inner surface of the furnace wall 1 over the surface of a water pipe 11.
  • FIG. 5 is a schematic diagram of a jet obtained in the case of a non-wall surface flow equivalent to region F in FIG. 3 . Since the tip of the nozzle 20 is positioned close to the inner surface of the furnace wall 1, a swirl flow jetting out of the nozzle 20 goes out into the furnace before it is expanded in the radial direction. The leak flow 23 straightly goes into the furnace and the circulating flow 31 also prevents a wall surface flow frombeing formed; therefore, a stable wall surface flow is difficult to be formed.
  • a stable wall surface flow can be formed without the influence of disturbance due to fluctuation in in-furnace pressure or the like. This is done by locating the position of the tip of the nozzle 20 at a distance of 0.8 times the inside diameter D of the nozzle 20 or more from the inner surface of the furnace wall 1.
  • FIG. 6 is a schematic diagram of a nozzle in a second embodiment of the invention.
  • this nozzle has an expanded structure in which the tip of the nozzle 20 is increased in cross-sectional area toward the downstream side.
  • an expanded portion 32 provided in the nozzle 20 faces in the radial direction.
  • FIG. 7 is a schematic diagram of a nozzle in a third embodiment of the invention.
  • This nozzle is provided at the tip thereof inside the nozzle 20 with a cylindrical expanded member 33 whose cross-sectional area is increased toward the downstream side.
  • the expanded member 33 faces in the radial direction and the following advantages are brought: a swirl flow is readily expanded in the radial direction and the production of a circulating flow 31 is suppressed; and thus a more stable wall surface flow can be formed. Since the expanded member 33 is positioned in the nozzle, an advantage of the reduced influence of radiant heat is brought.
  • FIG. 8 is a schematic diagram of a nozzle in a fourth embodiment of the invention.
  • This nozzle is provided at the tip thereof inside the nozzle 20 with a projected and depressed member 34 in which tooth-like or strip-like members are arranged in the circumferential direction.
  • a flow jetting out of the nozzle is disturbed by the member 34 and is readily diffused in the circumferential direction. For this reason, a flow jetting out of the nozzle is readily expanded and the production of a circulating flow 31 is suppressed; consequently, the flow jetting out of the nozzle 20 becomes a stable wall surface flow.
  • FIG. 9 is a schematic diagram of a nozzle in a fifth embodiment of the invention.
  • This nozzle has an expanded structure in which an expanded portion 28 expanded toward the outlet is formed at the outlet portion of the through hole 30 in the furnace wall 1.
  • a swirl flow jetting out of the nozzle 20 is readily expanded in the radial direction at the outlet of the through hole 30 and the production of a circulating flow 31 is suppressed. This brings an advantage that a more stable wall surface flow can be formed.
  • FIG. 10 is a schematic diagram of a nozzle in a sixth embodiment of the invention.
  • a guide vane 29 in which the radial angle of blades arranged in the circumferential direction can be inclined and adjusted is provided in place of the swirl vane 25 illustrated in FIG. 9 .
  • the air flow rate is adjusted by a damper 36.
  • a strong swirl flow making a wall surface flow can be formed similarly to the embodiment in FIG. 9 .
  • the tangential velocity component can be adjusted by adjusting the angle of the guide vane 29 by an adjust handle 35 as an adjusting member. This brings an advantage that the shape of a jet can be widely controlled.
  • FIG. 11 is a schematic diagram of a boiler to which a nozzle structure in a seventh embodiment of the invention is applied.
  • a burner 2 is provided at the lower part of the boiler. Gas 5 containing unburned components ascends from the burner portion.
  • After-air (air) 7 is supplied from an after-air nozzle 3 provided at the upper part of the boiler and the unburned components are completely burned and the gas is discharged as exhaust gas 9 from the furnace.
  • An air supply nozzle 4 of the invention is provided below the after-air nozzle 3.
  • Air (oxygen) is supplied as a wall surface flow 8 to the proximity of the wall where air cannot be supplied by the after-air nozzle 3. Air can be thereby evenly mixed in the furnace and unburned components and CO in the proximity of the wall can be reduced in quantity. Consequently, the rate of combustion of fuel in the furnace is improved and a cost-effective boiler can be provided.
  • FIG. 12 is a schematic diagram of a boiler to which an air supply nozzle structure in an eighth embodiment of the invention is applied.
  • the air supply nozzle 4 is provided in the proximity of a burner 2 at the lower part of the boiler. In the proximity of the burner, the oxygen concentration is low and a furnace wall is prone to corrode.
  • FIG. 13 is a fragmentary view taken in the direction of arrow B-B of FIG. 12 .
  • the following can be implemented by installing the air supply nozzle 4 of the invention at the height at which the burner is installed: air (oxygen) is caused to flow over the surface of a water pipe by a wall surface flow along the furnace wall like the jets 8 illustrated in FIG.
  • burners 2 are provided only on one side. Even when burners 2 are provided on both sides as in FIG. 11 , the same effect is obtained.
  • the air supply nozzles 4 are provided in three faces other than the burner 2 installation face; however, they can also be provided in the burner 2 installation face.
  • the air supply nozzles 4 are provided at the height at which the lowermost burner 2 is installed. However, they may be provided at any height at which a burner 2 positioned below the after-air nozzles 3 (upstream side) is installed.
  • a flow along a wall can be formed even when there is a gap between a nozzle provided in a through hole communicating with the interior of a furnace and the through hole.
  • oxygen can be supplied to the proximity of a wall and unburned components and CO existing in the proximity of the wall are reduced in quantity.
  • oxygen can be supplied along the surface of a water pipe and corrosion of the furnace wall can be suppressed.
  • structural materials comprising the nozzle are not protruded into the furnace, burnout of the nozzle members due to radiant heat can be suppressed and a reliable and cost-effective boiler can be provided.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)
  • Combustion Of Fluid Fuel (AREA)

Claims (9)

  1. Kessel, der mit einem Brenner (2) ausgestattet ist, der Brennstoff verbrennt, der einem Brennofen zugeführt wird, wobei der Kessel Folgendes umfasst:
    eine Brennofenwand (1), in der eine Wasserleitung (11) montiert ist und ein Durchgangsloch (30) gebildet ist, wobei der Kessel ferner eine Luftzuführdüse (4) umfasst, die eine Düse (20), die durch das Durchgangsloch (30) eingeführt wird und dem Brennofen Luft zuführt, und eine Führung (16) enthält, die der Düse (20) Luft zuführt, und einen ebenen Spalt (26) zwischen der Führung (16) und der Brennofenwand (1) aufweist, und einen ringförmigen Spalt (24) zwischen der Düse (20) und dem Durchgangsloch (30) aufweist, wobei der ebene Spalt (26) und der ringförmige Spalt (24) verbunden sind, so dass bei Verwendung eine Leckströmung (15) auftritt, die aus Luft gebildet wird, die aus dem Spalt (26) einströmt und aus dem Spalt (24) in den Brennofen ausströmt, dadurch gekennzeichnet, dass
    die Luftzuführdüse (4) ein Verwirbelungselement (25) enthält, das der Luft, die der Düse (20) zugeführt wird, eine tangentiale Geschwindigkeitskomponente gibt, und die Position der Spitze der Luftzuführdüse (4) sich in dem Durchgangsloch (30) in einem Abstand, der dem 0,8-fachen des Düseninnendurchmessers (D) oder mehr entspricht, von der Innenfläche der Brennofenwand (1) befindet.
  2. Kessel, der mit der Luftzuführdüse nach Anspruch 1 ausgestattet ist, dadurch gekennzeichnet, dass die Luftzuführdüse eine erweiterte Struktur aufweist, in der die Spitze der Düse in der Querschnittsfläche in Richtung der Abströmseite zunimmt.
  3. Mit der Luftzuführdüse ausgestatteter Kessel nach Anspruch 1, dadurch gekennzeichnet, dass die Düse mit einem zylindrischen erweiterten Element versehen ist, dessen Querschnittsfläche in Richtung der Abströmseite zunimmt.
  4. Mit der Luftzuführdüse ausgestatteter Kessel nach Anspruch 1, dadurch gekennzeichnet, dass die Düse an ihrer Spitze mit einem hervorstehenden und vertieften Element versehen ist.
  5. Mit der Luftzuführdüse ausgestatteter Kessel nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Durchgangsloch auf der Innenflächenseite des Brennofens eine erweiterte Struktur aufweist.
  6. Mit der Luftzuführdüse ausgestatteter Kessel nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass ein Einstellelement, das die tangentiale Geschwindigkeitskomponente von Luft einstellt, vorgesehen ist.
  7. Mit der Luftzuführdüse ausgestatteter Kessel nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Luftzuführdüse auf der Abströmseite des Brenners vorgesehen ist.
  8. Mit der Luftzuführdüse ausgestatteter Kessel nach Anspruch 7, dadurch gekennzeichnet, dass auf der Abströmseite des Brenners in mindestens zwei oder mehr Stufen eine Düse vorgesehen ist, die dem Brenner im Brennofen einen Mangel an Verbrennungsluft zuführt, und die Luftzuführdüse als Teil der Düsen vorgesehen ist.
  9. Mit der Luftzuführdüse ausgestatteter Kessel nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Luftzuführdüse auf der Höhe vorgesehen ist, auf der der Brenner positioniert ist.
EP12734688.0A 2011-01-12 2012-01-12 Kesselvorrichtung Not-in-force EP2664847B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011003617A JP5530373B2 (ja) 2011-01-12 2011-01-12 ボイラ装置
PCT/JP2012/050412 WO2012096319A1 (ja) 2011-01-12 2012-01-12 ボイラ装置

Publications (3)

Publication Number Publication Date
EP2664847A1 EP2664847A1 (de) 2013-11-20
EP2664847A4 EP2664847A4 (de) 2015-05-20
EP2664847B1 true EP2664847B1 (de) 2017-04-26

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EP12734688.0A Not-in-force EP2664847B1 (de) 2011-01-12 2012-01-12 Kesselvorrichtung

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EP (1) EP2664847B1 (de)
JP (1) JP5530373B2 (de)
PL (1) PL2664847T3 (de)
TW (1) TW201248089A (de)
WO (1) WO2012096319A1 (de)

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DE102021002508A1 (de) 2021-05-12 2022-11-17 Martin GmbH für Umwelt- und Energietechnik Düse zum Einblasen von Gas in eine Verbrennungsanlage mit einem Rohr und einem Drallerzeuger, Rauchgaszug mit einer derartigen Düse und Verfahren zur Verwendung einer derartigen Düse

Citations (1)

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JP2012145267A (ja) 2012-08-02
WO2012096319A1 (ja) 2012-07-19
PL2664847T3 (pl) 2017-09-29
TW201248089A (en) 2012-12-01
EP2664847A4 (de) 2015-05-20
JP5530373B2 (ja) 2014-06-25

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