US20130340659A1 - Combustion device - Google Patents

Combustion device Download PDF

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Publication number
US20130340659A1
US20130340659A1 US13/981,485 US201113981485A US2013340659A1 US 20130340659 A1 US20130340659 A1 US 20130340659A1 US 201113981485 A US201113981485 A US 201113981485A US 2013340659 A1 US2013340659 A1 US 2013340659A1
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US
United States
Prior art keywords
burner
furnace
combustion
air
wind box
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.)
Abandoned
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US13/981,485
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English (en)
Inventor
Yusuke Ochi
Kouji Kuramashi
Kenji Kiyama
Hirofumi Okazaki
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Mitsubishi Power Ltd
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Babcock Hitachi KK
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Filing date
Publication date
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Assigned to BABCOCK-HITACHI KABUSHIKI KAISHA reassignment BABCOCK-HITACHI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OKAZAKI, HIROFUMI, KIYAMA, KENJI, KURAMASHI, KOUJI, OCHI, YUSUKE
Publication of US20130340659A1 publication Critical patent/US20130340659A1/en
Assigned to MITSUBISHI HITACHI POWER SYSTEMS, LTD. reassignment MITSUBISHI HITACHI POWER SYSTEMS, LTD. MERGER AND CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BABCOCK-HITACHI KABUSHIKI KAISHA
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/005—Burners for combustion of pulverulent fuel burning a mixture of pulverulent fuel delivered as a slurry, i.e. comprising a carrying liquid
    • 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
    • F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
    • 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
    • F23L1/00—Passages or apertures for delivering primary air for 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
    • F23L3/00—Arrangements of valves or dampers before the fire
    • 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 
    • 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
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/02—Baffles or deflectors for air or combustion products; Flame shields in air inlets
    • 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

Definitions

  • the present invention relates to a combustion device such as a pulverized coal burning boiler having a pulverized coal burner.
  • a combustion method using a pulverized coal burner of a pulverized coal burning boiler there is adopted a two-stage combustion method that combusts a fuel in an air insufficient state and then complete burning air is supplied from an after air port in order to reduce an emission rate of a nitride oxide (which will be referred to as NOx hereinafter) in a combustion exhaust gas.
  • NOx nitride oxide
  • the furnace installing position of the after-air port may be the same as that in the conventional example, this position is provided on a lower (upstream) side in the furnace as compared with the conventional examples even if a combustion temperature of the burner flames becomes high, and hence an exhaust gas temperature at the outlet of the furnace can be the same as that in the conventional examples.
  • Japanese Unexamined Patent Application Publication No. 2008-121924 discloses a burner having a movable nozzle.
  • the nozzle is movable in a portion that faces a furnace and has high radiant heat, consideration must be given to damage due to falling of clinkers adhering to the inside of the furnace or securement of movability.
  • Japanese Unexamined Patent Application Publication No. 2002-147713 discloses a burner that changes a direction of flames (a combustion region) by deviating an air flow rate in a circumferential direction of a burner.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2008-121924
  • Patent Literature 2 Japanese Unexamined Patent Application Publication No. 2002-147713
  • a first aspect of the present invention provides a combustion device comprising a plurality of burners 19 arranged on a furnace wall 10 of a furnace 18 , each burner 19 comprising: a cylindrical fuel nozzle 1 that injects a mixture of a fuel and a carrier gas therefor into the furnace 18 ; one or more cylindrical combustion gas nozzles 8 , 11 that are provided on the outer circumference of the fuel nozzle 1 and inject a combustion gas into the furnace 18 ; and a wind box 12 that supplies the combustion gas to the combustion gas nozzles 8 , 11 , wherein the wind box 12 has a combustion gas inflow opening portion 12 a, 12 b into which the combustion gas flows from one direction vertical to the axial direction of the burner 19 and is partitioned to form a plurality of parallel flow paths through which the combustion gas flows in from the combustion gas inflow opening portion 12 a, 12 b, some of the plurality of flow paths are connected to an upper side of the combustion gas nozzles 8 , 11 , the other flow paths are connected to a lower side of
  • a second aspect of the present invention provides the combustion device according to the first aspect, wherein one duct 16 through which the combustion gas is supplied to the plurality of wind boxes 12 from the outside of the furnace 18 is installed on the outer side of the furnace wall 10 on which the wind boxes 12 are installed.
  • a third aspect of the present invention provides the combustion device according to the first aspect, wherein the plurality of wind boxes 12 are aligned and installed inside or outside of the one duct 16 .
  • a fourth aspect of the present invention provides the combustion device according to the first aspect, wherein second flow rate adjusting means 17 for adjusting a flow rate of the combustion gas that flows into each burner 19 on the upstream side of the first flow rate adjusting means 15 is provided in each wind box 12 .
  • the first flow rate adjusting means 15 for adjusting a combustion gas flow rate is provided to each of the plurality of combustion gas nozzles 8 and 11 , when an opening degree of the first flow rate adjusting means 15 is adjusted, a momentum of the combustion gas injected into the furnace from the burner 19 can be independently adjusted on each of upper and lower sides.
  • a momentum an air injection flow rate of the air flow rate from the lower side can be higher than that from the upper side of the burner 19 , flames can be deflected to a downward direction.
  • the flames can be deflected, and the thermal absorption of the furnace can be controlled.
  • a temperature controller on the rear heat transfer surface of the furnace 18 can be eliminated.
  • the NOx reduction technology based on the change in the after-air port installing position and the air excess ratio can be applied without changing a steam temperature and a metal temperature of the rear heat transfer surface in the conventional example.
  • the combustion region of the burner 19 can be shifted to the lower side, the detention time of the NOx reduction region between the burner 19 and the after-air port 24 can be increased to be longer than that in a case where the injecting direction of the flames is horizontal, and the NOx concentration in the exhaust gas can be reduced as compared with the conventional example.
  • the combustion gas supplied to the wind box 12 provided on the outer side of one furnace wall surface 10 can be collectively supplied from one duct 16 , and the combustion gas supply system for the plurality of burners 19 can have a simple configuration.
  • the plurality of wind boxes 12 are aligned and installed on the outer side of the furnace wall 10 inside or outside one duct 16 , construction of the plurality of wind boxes 12 and the duct 16 can be facilitated.
  • the first flow rate adjusting means 15 provided to one wind box 12 can deviate the momentum of the combustion gas on each of the upper and lower sides of the burner 19 , and providing the second flow rate adjusting means 17 on the upstream side of the first flow rate adjusting means 15 enables facilitating adjustment of an amount of the combustion gas supplied to each burner 19 .
  • FIG. 1 is a schematic view showing a pulverized coal boiler system according to the present invention
  • FIG. 2 is a cross-sectional view of a pulverized coal burner according to an embodiment of the present invention
  • FIG. 3 is a perspective view ( FIG. 3( a )) of a wind box and a view ( FIG. 3( b )) showing a wind tunnel test result concerning the wind box according to an embodiment of the present invention
  • FIG. 4 shows an example of the wind box in the form of a cross-sectional view ( FIG. 4( a )) taken along a line A-A in FIG. 2 and a cross-sectional view ( FIG. 4( b )) taken along a line B-B in FIG. 2 ;
  • FIG. 5 shows an example of the wind box in the form of a cross-sectional view ( FIG. 5( a )) taken along a line A-A in FIG. 2 and a cross-sectional view ( FIG. 5( b )) taken along a line B-B in FIG. 2 ;
  • FIG. 6 is a view showing a method for connecting each wind box with a combustion gas carrying duct and supplying combustion air according to an embodiment of the present invention
  • FIG. 7 is a view showing a method for installing each wind box in the combustion gas carrying duct and supplying the combustion air according to an embodiment of the present invention
  • FIG. 8 shows an example of the wind box in the form of a cross-sectional view taken along the line A-A in FIG. 2 ;
  • FIG. 9 shows an example of the wind box in the form of a cross-sectional view taken along the line A-A in FIG. 2 ;
  • FIG. 10 is a view showing a method for connecting each wind box with the combustion gas carrying duct and supplying the combustion air according to an embodiment of the present invention
  • FIG. 11 is a view showing a method for installing each wind box in the combustion gas carrying duct and supplying the combustion air according to an embodiment of the present invention
  • FIG. 12 shows an example of the wind box in the form of a cross-sectional view taken along the line A-A in FIG. 2 ;
  • FIG. 13 shows an example of the wind box in the form of a cross-sectional view taken along the line A-A in FIG. 2 ;
  • FIG. 14 is a view showing a method for connecting each wind box with the combustion gas carrying duct and supplying the combustion air according to an embodiment of the present invention
  • FIG. 15 is a view showing a method for installing each wind box in the combustion gas carrying duct and supplying the combustion air according to an embodiment of the present invention
  • FIG. 16 shows an example of the wind box in the form of a cross-sectional view ( FIG. 16( a )) taken along the line A-A in FIG. 2 and a cross-sectional view ( FIG. 16( b )) taken along a line B-B in FIG. 2 ;
  • FIG. 17 shows an example of the wind box in the form of a cross-sectional view ( FIG. 17( a )) taken along the line A-A in FIG. 2 and a cross-sectional view ( FIG. 17( b )) taken along a line B-B in FIG. 2 ;
  • FIG. 18 is a view showing a method for installing each wind box in the combustion gas carrying duct and supplying the combustion air according to an embodiment of the present invention.
  • FIG. 19 is a view showing a method for connecting each wind box with the combustion gas carrying duct and supplying the combustion air according to an embodiment of the present invention.
  • FIG. 1 shows a pulverized coal boiler system according to the present invention
  • FIG. 2 is a cross-sectional view of a pulverized coal burner 19 concerning the pulverized coal boiler system in FIG. 1
  • FIG. 3 is a perspective view ( FIG. 3( a )) of a wind box 12 of the pulverized coal burner 19 and a view ( FIG. 3( b )) showing a wind tunnel test result concerning the wind box 12 .
  • a fuel in the present invention is not restricted to pulverized coal, and a solid fuel pulverized so that it can be carried using an air current can be used without regard to its type or composition.
  • air is mainly used as a fuel carrying gas and a combustion gas
  • the present invention is not necessarily restricted to air alone, and it is possible to adopt any gas that can be used as the fuel carrying gas and the combustion gas for a combustion device such as a boiler, e.g., a combustion exhaust gas or a mixed gas of air or oxygen and the combustion exhaust gas without regard to its type or composition.
  • pulverized coal and combustion air are supplied to burners 19 provided on a plurality of stages on a furnace wall 10 of a boiler furnace 18 , the pulverized coal is combusted, and a non-illustrated water wall constituting the furnace wall 10 and a heat exchanger such as a non-illustrated superheater provided in the furnace are heated, thereby generating water vapor.
  • the pulverized coal supplied to each burner 19 is obtained by pulverizing coal in a bunker 20 with use of a mill 21 , and the pulverized coal is carried on an air current and supplied to each burner 19 by using a blower 23 . Further, the combustion air supplied to each burner 19 and each after-air port 24 is supplied through a duct 16 by a blower 25 , and the combustion air is supplied to each pulverized coal burner 19 from each wind box 12 arranged on the outer side of the boiler furnace wall 10 .
  • An oil spraying nozzle 7 is arranged at a central axis of the pulverized coal burner 19 , a fuel nozzle 3 through which a gas-particle flow 1 of the pulverized coal and the carrying air is arranged at an outer periphery of the oil spraying nozzle 7 , and a secondary air nozzle 8 and a tertiary air nozzle 11 that inject the combustion air 2 are provided at an outer periphery of the fuel nozzle 3 .
  • an outer peripheral wall of the tertiary air nozzle 11 is formed of the wind box 12 .
  • the oil spraying nozzle 7 is used for auxiliary combustion at the time of starting up or low-load combustion of each burner 19 .
  • a venturi tube 6 configured to narrow a nozzle inner diameter of the fuel nozzle 3 is arranged on an inner peripheral wall of the fuel nozzle 3 , and a pulverized coal concentrator 5 is provided on the outer periphery of the oil spraying nozzle 7 near an outlet portion of the fuel nozzle 3 .
  • a flame stabilizer 4 is provided at an end of a partition wall (an outlet portion of each of the nozzles 3 and 8 ) that partitions the fuel nozzle 3 and the secondary air nozzle 8 , and a guide sleeve 13 that directs a fluid toward a diffusing direction from the central axis of the burner 19 is provided at an end of a partition wall (an outlet portion of each of the nozzles 8 and 11 ) that partitions the secondary air nozzle 8 and the tertiary air nozzle 11 .
  • each burner 19 is formed of the oil spraying nozzle 7 , the fuel nozzle 3 , the secondary air nozzle 8 , the tertiary air nozzle 11 , and the wind box 12 constituting the outer peripheral wall of the tertiary air nozzle 11 , and this burner 19 is installed on the furnace wall 10 of the furnace 18 .
  • FIG. 3( a ) shows a perspective view of the wind box 12 of the pulverized coal burner 19 according to this embodiment
  • FIG. 4 shows a cross-sectional view ( FIG. 4( a )) taken along a line A-A in FIG. 2 and a cross-sectional view ( FIG. 4( b )) taken along a line B-B in FIG. 2 .
  • each dark arrow shown in FIG. 4 and subsequent drawings represents an inflow direction of the combustion air.
  • a heavy oil nozzle 7 and the pulverized coal nozzle 3 are not shown in FIG. 4 , and the heavy oil nozzle 7 and the pulverized coal nozzle 3 are arranged in a cylindrical through hole of the wind box 12 .
  • a furnace wall of the through hole constitutes an outer wall of the secondary air nozzle 8 .
  • the wind box 12 having combustion air inlet openings 12 a and 12 b provided in a direction vertical to a central axis direction of the pulverized coal burner 19 , and the secondary air nozzle 8 is arranged as if it is inserted in the through hole provided in the wind box 12 .
  • the two combustion air inlet openings 12 a and 12 b are provided in the wind box 12 , a partition plate 14 that partitions the two combustion air inlet openings (combustion gas opening portions) 12 a and 12 b is provided, and the partition plate 14 is connected to the outer side of a portion that divides the outer wall of the secondary air nozzle 8 constituting the through hole of the wind box 12 into two parts.
  • Upper and lower dampers 15 a and 15 b each of which has a rotary shaft in a direction cutting across a flow of the combustion air introduced into the wind box and changes an area through which the combustion air flows, are provided near the combustion air inlet openings 12 a and 12 b in the wind box 12 divided into upper and lower parts by the partition plate 14 , and separately adjusting respective rotation angles of the two dampers 15 a and 15 b enables deviating a momentum of the combustion air injected from the pulverized coal burner 19 depending on each of upper and lower sides in the wind box 12 .
  • each of the dampers 15 a and 15 b is arranged in the wind box 12 to be retracted by a length L 1 from the inlet opening portion of the wind box 12 .
  • FIG. 3( b ) shows a result of a tertiary air flow path outlet velocity distribution at the time of flame downward deflection realized by conducting a test for deviating a momentum of tertiary air injected from the tertiary air nozzle 11 into the furnace depending on each of the upper and lower sides of the burner 19 based on the wind tunnel test. It was confirmed from this wind tunnel test that the momentum of the combustion air on the lower side of the burner 19 can be increased by adjusting a revolving angle of each of the upper and lower revolving dampers 15 a and 15 b. In case of deflecting flames into the furnace 18 on the upper side of the burner 19 , the upper revolving damper 15 a is opened, and the lower revolving damper 15 b is closed.
  • the combustion air can be gradually injected.
  • Two upper and lower opening portions 8 a are provided at the outer peripheral portion of the secondary air nozzle 8 , and it is desirable to provide an air capacity adjusting mechanism such as slide type dampers 9 a and 9 b that adjust an amount of air supplied into the secondary air nozzle 8 from the opening portions 8 a as shown in FIG. 2 .
  • the air can be prevented from flowing into the upper secondary air nozzle 8 and the tertiary air nozzle 11 by fully closing the upper opening portion 8 a of the secondary air nozzle 8 with use of the slide type damper 9 a, and the momentum of the air injected into the furnace 18 from the secondary air nozzle 8 can be substantially homogeneously maintained in the circumferential direction, thereby keeping flame stabilizing properties.
  • the momentum of the air injected from the secondary air nozzle 8 into the furnace 18 can be substantially evenly maintained along the circumferential direction of the secondary air nozzle 8 only if the combustion air flows into the secondary nozzle 8 from any position irrespective of whether the upper opening portion 8 a of the secondary air nozzle 8 is fully closed by using the slide type damper 9 a, but the upper opening portion 8 a of the secondary air nozzle 8 must be fully closed by using the slide type damper 9 a if softening the deflection of the flames in the furnace 18 toward the lower side is undesirable.
  • a direction of the flames in the furnace 18 can be deflected by just deviating the momentum of the combustion air in each of the upper half portion and the lower half portion in the burner 19 while maintaining flame stabilizing properties by adjusting an inflow amount of the combustion air.
  • the combustion air inlet openings 12 a and 12 b obtained by dividing the inside of the wind box shown in FIG. 5 into two parts by the partition plate 14 is further divided into two parts and dampers 15 aa and 15 ab and dampers 15 ba and 15 bb are provided to the respective combustion air inlet openings 12 a and 12 b, the momentum of the combustion air is deviated in each of the upper half and the lower half of the burner 19 , whereby a direction of flames in the furnace 18 can be deflected.
  • the burners 19 each having the wind box 12 are installed on the furnace wall 10 of the boiler furnace 18 , and the combustion air is supplied into the burners 19 from the duct 16 provided on the outer side of the furnace wall 10 .
  • arrangement of the duct 16 is dependent on a boiler configuration and an installation angle of the burner 19 relative to the furnace wall 10 .
  • the burners 19 each having the wind box 12 are arranged in the duct 16 as shown in FIG. 7 , the momentum of the combustion air in each of the upper half and the lower half of each burner 19 can be deviated, and a direction of flames in the furnace 18 can be deflected.
  • a wind box 12 into which combustion air flows only from the upper side that is vertical to a central axis direction of a burner 19 is provided, and a plurality of partition plate 14 and revolving dampers 15 are provided in the wind box 12 so that the momentum of the combustion air injected into a furnace can be deviated depending on each of upper and lower sides by adjusting the dampers 15 .
  • the partition plates 14 are provided so as to divide into three parts the wind box 12 into which the combustion air flows from one direction, i.e., either upper combustion air inlet opening 12 a or 12 b vertical to the central axis direction of the burner 19 .
  • the dampers 15 a, 15 b, and 15 b as air capacity adjusters are provided on the upstream side of trifurcated air inflow paths in the wind box 12 , respectively. Therefore, air flows into the upper side of the burner 19 from a central portion of the wind box 12 , and air flows into the lower side of the burner 19 from left and right portions of the wind box 12 .
  • two partition plates 14 are provided so as to divide into four parts a wind box 12 into which the combustion air flows from one direction, i.e., either upper combustion air inlet opening 12 a or 12 b vertical to the central axis direction of the burner 19 .
  • the combustion air inlet opening 12 a at a central portion of the wind box 12 is divided into two parts, and dampers 15 aa, 15 ab, and 15 b as air capacity adjusters are provided on the upstream side of respective air inflow paths. Therefore, also when shown in FIG. 9 , airflows into the upper side of the burner 19 from an upper central portion of the wind box 12 , and air flows into the lower side of the burner 19 from left and right portions of the wind box 12 .
  • the momentum on the lower side of the burner 19 in the furnace 18 can be increased by adjusting an amount of the combustion air flowing into the wind box 12 by using three or four dampers 15 .
  • Performing an operation opposite to the above-described operation can cope with deflection of flames toward the upper side of the burner 19 in the furnace.
  • a secondary air nozzle 8 having a guide sleeve 13 at an end thereof is provided in the wind box 12 so that the combustion air can be gradually injected.
  • An opening portion 8 a is provided in an outer wall of the secondary air nozzle 8 , and it is desirable to use an air capacity adjusting mechanism such as slide type dampers 9 a and 9 b shown in FIG. 2 that can adjust an amount of air supplied into the secondary air nozzle 8 in order to adjust an opening degree of the opening portion 8 a.
  • an air capacity adjusting mechanism such as slide type dampers 9 a and 9 b shown in FIG. 2 that can adjust an amount of air supplied into the secondary air nozzle 8 in order to adjust an opening degree of the opening portion 8 a.
  • the flames can be deflected by just deviating the momentum of the tertiary air depending on each of the upper and lower sides of the burner 19 while maintaining the flame stabilizing properties by the above-described operation. According to these structures and the operating method, even when the combustion air inlet opening 12 a in the central portion of the wind box 12 is divided into two portions as shown in FIG. 9 and the dampers 15 aa and 15 ab are provided near these divided portions, the same effect can be obtained by a damper adjustment method.
  • This embodiment provides a configuration that burners 19 each having the wind box 12 are installed on the outer side of the furnace wall 10 of the boiler furnace 18 and the combustion air is put into a duct 16 connected to each wind box 12 from an illustrated inflow direction.
  • arrangement of the duct 16 is dependent on a boiler configuration and an installation angle of the burner 19 relative to the furnace wall 10 . Further, even if the burners 19 each having the wind box 12 are arranged in the duct 16 as shown in FIG. 11 , the same operation method can be executed.
  • This embodiment shown in FIG. 12 and FIG. 13 has a configuration that a wind box 12 into which combustion air flows only from lower combustion air inlet openings 12 a and 12 b vertical to a central axis of the burner 19 is provided, the inside of the wind box 12 is partitioned by a plurality of partition plates 14 , dampers 15 b, 15 a, and 15 b or 15 b, 15 aa, 15 ab, and 15 b are provided in respective combustion air nozzles in the wind box 12 partitioned by the partition plates 14 , and the momentum of the combustion air injected into a furnace 18 from the burner 19 is deviated depending on each of upper and lower sides of the burner 19 by adjusting opening/closing degrees of the dampers 15 b, 15 a, and 15 b or 15 b, 15 aa, 15 ab, and 15 b.
  • the partition plates 14 and 14 are provided so as to divide the wind box 12 , into which the combustion air flows from only one lower direction which is a direction vertical to the central axis direction of the burner 19 , into three portions.
  • dampers 15 b, 15 a, and 15 b as air capacity adjusters are provided on upstream portions of trifurcated air inflow paths 12 b, 12 a, and 12 b of the wind box 12 . Therefore, air from a combustion air inlet opening 12 a at a central portion of the wind box 12 flows into the lower side of the burner 19 , and air flows into the upper side of the burner 19 from the left and right combustion air inlet openings 12 b and 12 b of the wind box 12 .
  • the momentum on the lower side of the burner 19 can be increased by adjusting opening/closing degrees of the three dampers 15 b, 15 a, and 15 b, and performing an operation opposite to the above-described operation can cope with deflection of flames toward the upper side of the burner 19 in the furnace 18 .
  • a secondary air nozzle 8 having a guide sleeve 13 is provided in the wind box 12 so that the combustion air can be injected along a spreading direction from an outlet of the burner 19 . Further, an opening portion 8 a ( FIG. 2 ) is provided in the secondary air nozzle 8 , and it is desirable to adjust an air inflow amount from the opening portion 8 a by providing a slide type damper 9 shown in FIG. 2 .
  • the flames can be deflected by just adjusting a tertiary air injection amount to deviate the momentum of the air depending on each of the upper and lower sides of the burner 19 while maintaining the flame stabilizing properties by the above-described operation.
  • the combustion air inlet openings 12 b and 12 b are provided on both sides of the lower side of the wind box 12 , the combustion air inlet opening 12 a in the central portion is divided into two portions, and the dampers 15 b, 15 aa, 15 ab, and 15 b are provided on the upstream side of the respective air inflow paths as shown in FIG. 13 , the same effect can be obtained by adjustment methods of the dampers 15 b, 15 aa, 15 ab, and 15 b.
  • This embodiment is characterized in that the burners 19 each having the wind box 12 are installed on the boiler furnace wall 10 as shown in FIG. 14 and the combustion air is supplied into the burners 19 from a duct 16 provided on the outer side of the furnace wall 10 .
  • arrangement of the duct 16 is dependent on a boiler configuration and an installation angle of the burner 19 . Further, even if the burners 19 each having the wind box 12 are arranged in the duct 16 as shown in FIG. 15 , the same operation method can be carried out.
  • This embodiment provides a configuration where a second damper 17 as a supply air capacity adjuster for each burner 19 , which is configured to adjust a flow rate of combustion air flowing into each burner 19 , is provided on the upstream side of a damper 15 in addition to the configurations of Embodiments 1 to 3.
  • combustion air flow rate can be adjusted by a first damper 15 alone if its opening degree is adjusted in accordance with each burner 19 , when the first damper 15 provided for the purpose of deviating a momentum of the combustion air on each of upper and lower sides of each burner 19 has a function of adjusting the combustion air flow rate consistent with the fuel supply amount, controlling this damper becomes difficult.
  • the first damper 15 and the second damper 17 that share the two different functions are independently provided.
  • FIG. 16 and FIG. 17 shows a configuration where, in addition to first dampers 15 a and 15 b configured to deviate an air momentum on each of upper and lower sides of the burner 19 described in Embodiment 1 ( FIGS. 4 and 5 ), second dampers 17 a and 17 b for adjusting a flow rate of the combustion air flowing into each burner 19 are provided on the upstream side of the first dampers 15 a and 15 b.
  • the flow rate of the combustion air flowing into each burner 19 can be individually adjusted without suppressing a deviation of the momentum of the combustion air on each of the upper and lower sides of the burner 19 .
  • first dampers 15 a and 15 b which are adjusters that deviate the momentum of the combustion air on each of the upper and lower sides of each burner 19 in each wind box 12 , on the downstream side of the second dampers 17 a and 17 b can suffice, and the second dampers 17 a and 17 b can be arranged at any positions.
  • each of the first dampers 15 a and 15 b and the second dampers 17 a and 17 b a member that adjusts an opening area by sliding a plurality of laminated porous plates may be used in place of the illustrated butterfly type damper, and it can have any structure as long as it has a gas flow rate adjusting function.
  • such a secondary air nozzle 8 having the guide sleeve 13 as shown in FIG. 2 is provided in the wind box 12 , and the combustion air is injected into the furnace 18 from the outlet of the burner 19 in a spreading manner.
  • the opening portion 8 a is provided in the secondary air nozzle 8 , and it is desirable to provide the slide type damper 9 that can adjust an air capacity flowing into the secondary air nozzle 8 .
  • the combustion air can be prevented from flowing into the tertiary air nozzle 11 on the upper side in the wind box 12 by fully closing the opening portion 8 a of the secondary air nozzle 8 provided on the upper side in the wind box 12 with use of the slide type damper 9 a, and the momentum of the combustion air injected into the furnace 18 from the secondary air nozzle 8 can be substantially homogeneously maintained along the circumferential direction of the burner 19 , thereby holding the flame stabilizing properties.
  • the damper adjustment method for dividing each of the combustion air inlet openings 12 a and 12 b in the wind box 12 into two parts and providing the first dampers 15 aa, 15 ab, 15 ba, and 15 bb and the second dampers 17 aa, 17 ab, 17 ba, and 17 bb to the respective combustion air inlet openings 12 a and 12 b as shown in FIG. 17 enables individually adjusting the flow rate of the combustion air flowing into each burner 19 without suppressing a deviation of the momentum of the combustion air on each of the upper and lower sides of the burner 19 .
  • the burners 19 each having the wind box 12 are arranged in the duct 16 .
  • An air capacity of each of the plurality of burners 19 arranged on the furnace wall 10 along the horizontal direction in line can be adjusted by providing the second dampers 17 ( 17 a, 17 b and 17 aa, 17 ab; and 17 ba, 17 bb ) shown in FIG. 16 and FIG. 17 in each wind box 12 .
  • the burners 19 each having the wind box 12 shown in FIG. 16 and FIG. 17 may be installed on the outer side of the furnace wall 10 of the boiler so that the combustion air from the outside of the furnace 18 can be supplied into the burners 19 each having the wind box 12 through the duct 16 .
  • the industrial applicability can be further enhanced.

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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)
US13/981,485 2011-02-22 2011-02-22 Combustion device Abandoned US20130340659A1 (en)

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PCT/JP2011/000976 WO2012114370A1 (ja) 2011-02-22 2011-02-22 燃焼装置

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US (1) US20130340659A1 (de)
EP (1) EP2679899B1 (de)
JP (1) JP5743115B2 (de)
KR (1) KR101582729B1 (de)
AU (1) AU2011360560B2 (de)
CA (1) CA2827903C (de)
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CN108087867A (zh) * 2018-01-11 2018-05-29 西安热工研究院有限公司 一种用于平衡低负荷氮氧化物与汽水参数的低氮燃烧系统及方法
US10375901B2 (en) 2014-12-09 2019-08-13 Mtd Products Inc Blower/vacuum

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CN105202568B (zh) * 2015-10-14 2017-05-10 北京高能时代环境技术股份有限公司 生活垃圾炉排炉的二次风装置
CN109185872B (zh) * 2018-10-17 2023-09-19 烟台龙源电力技术股份有限公司 一种锅炉二次风系统
CN109185871B (zh) * 2018-10-17 2023-09-15 烟台龙源电力技术股份有限公司 一种锅炉二次风系统
JP7141574B1 (ja) * 2021-08-10 2022-09-26 コロナ株式会社 送風バーナ装置

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CA2827903C (en) 2016-07-12
EP2679899A4 (de) 2018-01-24
JP5743115B2 (ja) 2015-07-01
CA2827903A1 (en) 2012-08-30
AU2011360560B2 (en) 2015-11-05
EP2679899A1 (de) 2014-01-01
JPWO2012114370A1 (ja) 2014-07-07
KR20140008407A (ko) 2014-01-21
EP2679899B1 (de) 2021-04-07
WO2012114370A1 (ja) 2012-08-30
PL2679899T3 (pl) 2021-07-05

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