WO2009130857A1 - Brûleur de charbon pulvérisé - Google Patents

Brûleur de charbon pulvérisé Download PDF

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Publication number
WO2009130857A1
WO2009130857A1 PCT/JP2009/001648 JP2009001648W WO2009130857A1 WO 2009130857 A1 WO2009130857 A1 WO 2009130857A1 JP 2009001648 W JP2009001648 W JP 2009001648W WO 2009130857 A1 WO2009130857 A1 WO 2009130857A1
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WO
WIPO (PCT)
Prior art keywords
pulverized coal
nozzle
primary air
fixed plate
flow
Prior art date
Application number
PCT/JP2009/001648
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English (en)
Japanese (ja)
Inventor
越智佑介
倉増公治
岡▲崎▼洋文
Original Assignee
バブコック日立株式会社
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.)
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Publication date
Application filed by バブコック日立株式会社 filed Critical バブコック日立株式会社
Publication of WO2009130857A1 publication Critical patent/WO2009130857A1/fr
Priority to FI20106233A priority Critical patent/FI20106233A/fi

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    • 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
    • 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
    • F23C7/008—Flow control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F23D17/007—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel liquid or pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/10—Nozzle tips
    • 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
    • F23D2900/11402—Airflow diaphragms at burner nozzle

Definitions

  • the present invention relates to a pulverized coal burner used for a pulverized coal fired boiler or the like.
  • a pulverized coal burner 20 used in a furnace 21 such as a pulverized coal fired boiler as shown in FIG. 10 is intended to reduce the amount of nitrogen oxide (NOx) generated in combustion gas.
  • NOx nitrogen oxide
  • the coal supplied from the bunker 22 to the mill 23 is pulverized and supplied from the blower 24 to the pulverized coal burner 20.
  • Combustion air is supplied from the blower 26 to the wind box 8 around the pulverized coal burner 20 at the same time as the powder ends, and is used for burning the pulverized coal in the burner 20.
  • a pulverized coal burner 20 disclosed in US Pat. No. 5,697,306, which is an example of this type of pulverized coal burner 20 conventionally known is a core air nozzle that ejects combustion air to the central axis of the burner.
  • a pulverized coal nozzle through which a solid-gas two-phase flow of pulverized coal and conveying air flows is provided on the outer periphery thereof, and a secondary air nozzle and a tertiary air nozzle for ejecting combustion air on the outer periphery of the pulverized coal nozzle Is provided.
  • the pulverized coal burner 20 controls the ratio of air and fuel at the burner outlet by adjusting the amount of combustion air ejected from the core air nozzle to reduce the NOx concentration in the combustion gas.
  • FIG. 11 shows an example of this type of pulverized coal burner 20 that is conventionally known.
  • a primary air nozzle that blows combustion air around an oil spray nozzle provided in a central shaft portion, and transports pulverized coal to the outer periphery of the primary air nozzle.
  • a pulverized coal burner 20 provided with a pulverized coal nozzle through which a solid-gas two-phase flow with the working air flows, and a secondary air nozzle for ejecting combustion air on the outer periphery of the pulverized coal nozzle.
  • the combustion air ejected from the primary air nozzle is swirled by a swirler.
  • the primary air from the primary air nozzle is spouted from the burner into the furnace as a swirling flow, so that the primary air spreads to the outer periphery by centrifugal force and is easily mixed with pulverized coal.
  • a low pressure portion is formed in the furnace at the central portion of the burner outlet, and a circulating flow is formed in this portion from downstream to upstream. High-temperature burned gas stays in the circulating flow, so the pulverized coal is ignited earlier.
  • the circulation flow has an effect that a stable flame can be maintained, particularly when the oil burner is ignited by an ignition device.
  • the above-mentioned prior art is intended to reduce the NOx concentration in the combustion gas by adjusting the mixing ratio of pulverized coal and air by providing combustion air nozzles on the outer periphery and inside of the pulverized coal nozzle. Furthermore, in the case of a configuration in which the oil burner is ignited by an ignition device without having a starting torch in the prior art, a stable flame can be maintained by forming a circulation flow on the central axis of the burner outlet. Has characteristics.
  • the solid-gas two-phase flow ejected from the pulverized coal nozzle is centrifugal force when the primary air is ejected into the furnace as a swirling flow from the primary air nozzle by a swirler during pulverized coal combustion. It spreads to the outer peripheral side and becomes easy to mix with the combustion air from the secondary air nozzle and the tertiary air nozzle. Therefore, there is a technical problem that the NOx reduction region is reduced and the NOx concentration in the combustion gas increases.
  • An object of the present invention is to provide a pulverized coal burner that improves the above-described problems of the prior art with a simple structure and reduces the NOx concentration in combustion gas while maintaining the ignitability of pulverized coal and oil. That is.
  • the present invention relates to a pulverized coal burner having a pulverized coal nozzle having an oil spray nozzle on the central axis and a primary air nozzle around the nozzle, and a solid-gas two-phase flow of pulverized coal and conveying air on the outer periphery thereof.
  • the primary air nozzle includes a plate having a notch at the tip thereof and a structure that blocks a one-way flow path having an obstacle, and is capable of switching between a straight flow and a swirl flow depending on the combustion state.
  • the combustion air spreads to the outer periphery by centrifugal force and becomes easy to mix with the atomized oil.
  • a low pressure portion is formed in the central portion, and a circulating flow from downstream to upstream is formed in this portion. High-temperature burned gas stays in the circulating flow, accelerating the ignition of atomized oil.
  • a secondary air nozzle and a tertiary air nozzle for ejecting combustion air are provided on the outer periphery of the pulverized coal nozzle.
  • the obstacle By providing the obstacle, the pressure is reduced downstream of the obstacle, and a circulating flow is formed. High-temperature burned gas stays in the circulating flow and accelerates the ignition of pulverized coal.
  • a venturi inside the outer peripheral wall of the pulverized coal nozzle and a pulverized coal concentrator on the outer periphery of the primary combustion air nozzle.
  • a flame holder is provided on the outer peripheral portion of the fuel nozzle outlet, a recirculation region is formed in the downstream portion, and particles and gas having a light mass are entrained.
  • coarse coal with a 200-mesh pass rate of around 60-70% as the fuel the amount of pulverized coal caught in the recirculation zone downstream of the flame holder decreases because there is little pulverized coal of 30 ⁇ m or less.
  • Combustible volatile gas components released by heating the pulverized coal with the combustion air from the primary air nozzle instead of charcoal are entrained in the recirculation region, so a high-temperature gas body is also formed in the recirculation region
  • ignition flame holding of unignited coarse pulverized coal passing in the vicinity of the flame holder is promoted.
  • a high-temperature recirculation region can be formed in the wake of the flame holder as described above, and its ignitability is improved. be able to.
  • the one-way flow path of the primary air nozzle is closed, and the swirling flow is given to the jetting combustion air, so that the combustion air is centrifugal force It spreads around the burner outlet and becomes easy to mix with the atomized oil.
  • a low pressure portion is formed in the central portion of the burner outlet, and a circulating flow from downstream to upstream is formed in this portion. High-temperature burned gas stays in the circulating flow, accelerating the ignition of atomized oil.
  • a secondary air nozzle is provided by giving a straight flow to the combustion air jetted from the primary air nozzle into the furnace and further increasing the amount of combustion air.
  • the NOx concentration in the combustion gas can be reduced by delaying the subsequent mixing with the combustion air and expanding the NOx reduction region.
  • thermal expansion due to heat radiation of a structure that closes the flow path in one direction of the movable portion can be reduced.
  • FIG. 1 is a cross-sectional view of a pulverized coal burner according to Example 1.
  • FIG. It is the schematic of the movable member which block
  • Fig.2 (a) is the front view which looked at the fixed plate from the furnace side
  • FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A
  • FIG. 2C is a front view of the movable member viewed from the furnace side
  • FIG. FIG. 2E is a sectional view taken along the line B-C in FIG. 2C.
  • FIG.3 (a) is the front view which looked at the fixed plate from the furnace side
  • FIG.3 (b) is A of FIG.3 (a).
  • FIG. 3C is a front view of the movable member as viewed from the furnace side
  • FIG. 3D is a sectional view taken along the line BB in FIG. 3C.
  • FIG. 4E is a cross-sectional view taken along the line CC in FIG. 4 is a cross-sectional view of a pulverized coal burner according to Example 3.
  • FIG. 3 (a) is the front view which looked at the fixed plate from the furnace side
  • FIG.3 (b) is A of FIG.3 (a).
  • FIG. 3C is a front view of the movable member as viewed from the furnace side
  • FIG. 3D is a sectional view taken along the line BB in FIG. 3C.
  • FIG. 4E is a cross-sectional view taken along the line CC in FIG. 4 is a cross-sectional view of a pul
  • FIG.5 (a) is the front view which looked at the fixed plate from the furnace side
  • FIG.5 (b) is A of FIG.5 (a).
  • FIG. 5C is a front view of the movable member as viewed from the furnace side
  • FIG. 5D is a sectional view taken along the line BB in FIG. 5C
  • FIG. 5E is a sectional view taken along the line CC of FIG.
  • FIG. 6 (a) is the front view seen from the furnace side of the fixed plate
  • FIG.6 (b) is A of FIG.6 (a).
  • FIG. 6 (a) is the front view seen from the furnace side of the fixed plate
  • FIG.6 (b) is A of FIG.6 (a).
  • FIG. 6 (a) is the front view seen from the furnace side of the fixed plate
  • FIG.6 (b) is A of FIG.6 (a).
  • FIG. 6C is a front view of the movable member viewed from the furnace side
  • FIG. 6D is a cross-sectional view taken along the line BB in FIG. 6C
  • FIG. 6E is a sectional view taken along the line CC of FIG. 6 is a modified example of the fixed plate of FIG. 6, a front view of the fixed plate of FIG. 7A viewed from the furnace side
  • FIG. 7B is a cross-sectional view taken along the line AA of FIG. 7 (c) is a front view of the movable member 16 as viewed from the furnace side
  • FIG. 7 (d) is a sectional view taken along the line BB in FIG. 7 (c)
  • FIG. 7 (e) is FIG.
  • FIG. 2 is a cross-sectional view taken along the line CC of FIG.
  • Fig. 8 (a) is a front view of the fixed plate as viewed from the furnace side
  • Fig. 8 (b) is an AA line in Fig. 8 (a).
  • FIG. 8C is a front view of the movable member viewed from the furnace side
  • FIG. 8D is a sectional view taken along the line BB in FIG. 8C
  • FIG. 9 is a cross-sectional view taken along the line CC of FIG. It is a figure which shows the reduction effect of the NOx density
  • FIG. 1 is a cross-sectional view of the pulverized coal burner 20 of this embodiment.
  • the pulverized coal burner 20 has an oil spray nozzle 6 on the central axis and a primary air nozzle 1 around the oil spray nozzle 6, and a solid-gas two-phase flow 13 of pulverized coal and conveying air is formed on the outer periphery of the primary air nozzle 1. It has a flowing pulverized coal nozzle 4.
  • a secondary air nozzle 2 that ejects combustion air 12 to the outer periphery of the pulverized coal nozzle 4 and a tertiary air nozzle 3 to the outer periphery of the secondary air nozzle 2 are provided.
  • An oil spray nozzle 6 that penetrates the primary air nozzle 1 and is ignited by liquid fuel is provided, and the oil spray nozzle 6 is used for assisting pulverized coal when the burner is started or during low-load combustion.
  • a fixed plate 15 that swirls or goes straight to the air ejected from the primary air nozzle 1 is provided around the oil spray nozzle 6 at the tip of the primary air nozzle 1, and the primary air nozzle 1 upstream of the fixed plate 15.
  • a movable member 16 provided with a grid radially is provided around the oil spray nozzle 6 inside.
  • a venturi 5 for narrowing the nozzle inner diameter of the pulverized coal nozzle 4 is provided on the inner wall surface of the pulverized coal nozzle 4, and the outer wall surface of the primary air nozzle 1 in the pulverized coal nozzle 4 on the downstream side of the mounting portion of the venturi 5 is provided on the inner wall surface of the pulverized coal nozzle 4.
  • an expanding pulverized coal concentrator 11 is provided, and at the tip of the partition wall separating the pulverized coal nozzle 4 and the secondary air nozzle 2 (exit of the pulverized coal nozzle 4).
  • a flame holder 9 is provided, and an obstacle (guide sleeve) 10 is provided at the tip of the partition wall that separates the secondary air nozzle 2 and the tertiary air nozzle 3, and the furnace wall 7 to which the tip of the tertiary air nozzle 3 is attached.
  • the opening (burner throat) is an inclined wall surface.
  • the guide sleeve 10 and the inclined wall surface of the opening of the furnace wall 7 are configured to expand the secondary air flow path and the tertiary air flow path at substantially the same inclination angle.
  • FIG. 1 has a structure in which air is jetted from two directions at the tip of the primary air nozzle 1, and a fixed plate 15 that blocks a unidirectional flow path during oil combustion, and a movable that blocks a unidirectional flow path of the fixed plate.
  • a schematic diagram of the member 16 is shown in FIG. 2A is a front view of the fixed plate 15 viewed from the furnace side, FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A, and FIG. FIG. 2D is a sectional view taken along the line BB in FIG. 2C, and FIG. 2E is a sectional view taken along the line CC in FIG. 2C.
  • FIG. 2A is a front view of the fixed plate 15 viewed from the furnace side
  • FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A
  • FIG. 2D is a sectional view taken along the line BB in FIG. 2C
  • FIG. 2E is a sectional
  • the fixed plate 15 is disposed at the tip of the primary air nozzle 1 and has a plurality of slit holes 15a radially from the central portion, and the primary air jets into the furnace through the slit holes 15a. It is a disk-like structure that gives a right turn or a left turn.
  • a movable member 16 is slidably disposed in the furnace direction or in the direction away from the furnace (front-rear direction) on the upstream side of the fixed plate 15 installation portion in the primary air nozzle 1 by an operation member 17 provided outside the furnace. .
  • the slit hole 15a of the fixed plate 15 is sequentially reduced from a rectangular relatively wide opening from the upstream portion of the primary air nozzle 1 toward the furnace side, and is rectangular on the furnace side. It is the structure provided with the inclined wall surface which consists of a shape provided with relatively narrow opening. That is, each slit hole 15a is formed in at least one radial opening end (opening ridge line) 15a 1 on the upstream side of the primary air nozzle 1 and the upstream opening end (opening ridge line) 15a 1 .
  • An inclined wall surface having ⁇ is formed.
  • the inclination angle ⁇ of the inclined wall surface with respect to the surface of the fixed plate 15 is 90 ° or less ( ⁇ 90 °).
  • the wall surface facing the inclined wall surface also forms the same inclination angle ⁇ in the opposite direction.
  • the number of the slit holes 15a is changed depending on the required turning strength and turning angle.
  • each lattice 16a of the movable member 16 has a shape that can be inserted into the slit hole 15a of the fixed plate 15, and the cross-sectional shape shown in FIG. It is provided radially with fixed parts.
  • the inclination angle ⁇ of the corner portion on the bottom side of the cross section shown in FIG. 2D of the lattice 16a of the movable member 16 is the same as the inclination angle ⁇ of the inclined wall surface of the slit hole 15a of the fixed plate 15, and the fixed plate
  • the number of 16 lattices 16a matches the number of slit holes 15a.
  • each lattice 16a of the movable member 16 has the same number of substantially the same cross-sectional area as the slit holes 15a of the fixed plate 15, the movable member 16 is moved from the upstream side of the pulverized coal nozzle to the furnace side, and the movable member 16 is moved.
  • the opening area of the fixed plate slit holes 15a becomes narrow as shown in FIG.
  • the inclined surface of the lattice 16a shown in FIG. 2B is opposed to both sides of the slit hole 15a.
  • the gap h is provided so that the primary air jetted into the furnace through the slit hole 15a is turned rightward as indicated by an arrow toward the furnace. If it is provided on the side of the inclined wall surface opposite to the hole 15a, the primary air jetted into the furnace is given a left turn toward the furnace.
  • the movable member 16 is mounted on a tubular operation member 17 that is mounted on the outer periphery of the oil spray nozzle 6 that sprays heavy oil so as to be movable forward and backward. As long as the operation member 17 can drive the movable member 16 from the outer side of a furnace wall as shown in FIG. 1, a shape and a structure will not be ask
  • the movable member 16 can be operated by the operation member 17 so as to be able to advance and retreat in the longitudinal direction of the burner 20 (the direction along the central axis C).
  • the combustion air 12 is derived from the gap h between the other inclined wall surface of the slit hole 15a and the lattice 16a. Is ejected as a swirling flow.
  • the jetted combustion air 12 spreads to the outer peripheral side of the primary air nozzle 1 by centrifugal force and is easily mixed with the atomized oil. Further, a low pressure portion is formed at the central portion of the burner outlet in the furnace, and a circulating flow from downstream to upstream is formed in this portion. High-temperature burned gas stays in the circulating flow, accelerating the ignition of atomized oil.
  • the swirling flow of the combustion air 12 is preferably about 0.5 to 1.0 in terms of swirl number.
  • the movable member 16 is pulled away from the furnace, the grids 16a of the movable member 16 are separated from the slit holes 15a of the fixed plate 15, and are ejected from the primary air nozzle 1.
  • the swirl number of the combustion air 12 in the straight flow is preferably 0.1 or less.
  • the fixed plate 15 is disposed closer to the furnace side than the drive part of the movable member 16, the heat radiation from the inside of the furnace is blocked by the fixed plate 15 and hits the drive part of the movable member 16 can be reduced. , Thermal expansion can be reduced.
  • both opposing wall surfaces of the axial longitudinal flow path of the slit hole 15a of the fixed plate 15 are formed in a direction along the central axis C, and the cross-sectional shape of the lattice 16a of the movable member 16 narrows the flow path shape in the axial longitudinal direction.
  • the same effect can be obtained by inserting and removing the thus formed one.
  • FIG. 3 shows a fixed plate 15 and a movable member 16 that have a structure in which air is ejected from two directions at the tip of the primary air nozzle 1 in FIG. 1 and closes the flow path in one direction during oil combustion.
  • 3A is a front view of the fixed plate 15 viewed from the furnace side
  • FIG. 3B is a cross-sectional view taken along the line AA in FIG. 3A
  • FIG. 3 (d) is a cross-sectional view taken along the line BB of FIG. 3 (c)
  • FIG. 3 (e) is a cross-sectional view taken along the line CC of FIG. 3 (c).
  • FIG. 3 shows a fixed plate 15 and a movable member 16 that have a structure in which air is ejected from two directions at the tip of the primary air nozzle 1 in FIG. 1 and closes the flow path in one direction during oil combustion.
  • 3A is a front view of the fixed plate 15 viewed from the furnace side
  • FIG. 3B is
  • the fixed plate 15 shown in FIG. 3 has a shape in which a plurality of triangular slit holes 15a are provided in the circumferential direction so as to widen from the center, and the movable member 16 is inserted into each of the slit holes 15a.
  • 15a is provided with a plurality of triangular grids 16a having a triangular cross section in the circumferential direction so as to extend from the center of the burner so that the opening of the burner 15a can be closed. It is mounted on a tubular operating member 17 that is mounted on the outer periphery of the spray nozzle 6 so as to be able to advance and retract. Since the functions of the fixed plate 15 and the movable member 16 shown in FIG. 3 are the same as those of the fixed plate 15 and the movable member 16 described in the first embodiment, detailed description thereof will be omitted.
  • the shape of the flow path in the axial longitudinal direction of the opening of the slit hole 15a of the fixed plate 15 is shown, but the present invention is not limited to this.
  • FIG. 4 is a cross-sectional view of the pulverized coal burner 20 of the embodiment having a structure in which air is ejected from two directions at the tip of the primary air nozzle 1 and having a fixed plate that closes the flow path in one direction during oil combustion. Show. Since the pulverized coal burner 20 shown in FIG. 4 has the same structure as that of the pulverized coal burner 20 shown in FIG. 1 except for the configuration of the operation member 17, detailed description thereof will be omitted.
  • FIG. 5 shows the fixed plate 15 and the movable member 16 of the burner 20 of the present embodiment.
  • 5A is a front view of the fixed plate 15 as viewed from the furnace side
  • FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A
  • FIG. 5D is a cross-sectional view taken along the line BB in FIG. 5C
  • FIG. 5E is a cross-sectional view taken along the line CC in FIG. 5C.
  • FIG. 5A is a front view of the fixed plate 15 as viewed from the furnace side
  • FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A
  • FIG. 5D is a cross-sectional view taken along the line BB in FIG. 5C
  • FIG. 5E is a cross-sectional view taken along the line CC in FIG. 5C.
  • FIG. 5A is a front view of the fixed plate 15 as viewed from the furnace side
  • FIG. 5B is a cross-
  • the fixed plate 15 shown in FIG. 5 has a shape in which a plurality of triangular slits are provided in the circumferential direction so as to widen from the center, and the movable member 16 is inserted into the slit 15a to open the slit hole 15a.
  • a plurality of triangular lattices 16a are provided independently in the circumferential direction so as to be divergent from the center so that each portion can be closed, and each lattice 16a is individually connected to each lattice 16a. 17 is operated so as to freely advance and retract along the burner central axis C.
  • the fixed plate 15 shown in FIG. 5 has a structure that turns rightward toward the furnace. As shown in FIG. 4, it is fixed to the tip of the primary air nozzle 1 and a movable member 16 is installed upstream thereof.
  • the fixed plate 15 has a slit structure and has an inclined wall surface provided with a flow path that decreases toward the furnace.
  • the inclination angle ⁇ ( ⁇ 90 °) and the number of slits with respect to the plane on the furnace side of the fixed plate 15 of the inclined wall surface are changed depending on the required turning strength and turning angle.
  • the gap h between the inclined wall surface in one direction of the slit hole 15 a of the fixed plate 15 and the lattice 16 a of the movable member 16 can be closed.
  • the lattice 16a of the movable member 16 has an isosceles triangular section having the same inclination angle ⁇ as the inclination angle ⁇ of the inclined wall surface of the slit hole 15a of the fixed plate 15, and is provided in the same number as the slit holes 15a. Therefore, when the lattice 16a is inserted into the slit hole 15a of the fixed plate 15 to block the flow path on the one inclined wall surface side of the slit hole 15a, the turning strength increases as the gap h shown in FIG. .
  • the cross-section of the structure that blocks the flow path on one inclined wall surface side of the slit hole 15a is triangular, but the inflow of combustion air from the flow path on one inclined wall surface side of the slit hole 15a is prevented.
  • the shape of the slit hole 15a is not limited as long as it is a structure in which air is ejected into the furnace from the flow path on the other inclined wall surface side of the slit hole 15a.
  • each of the lattices 16a of the movable member 16 is inserted into each of the plurality of triangular slits 15a, and the combustion air jetted from the fixed plate 15 to the furnace side is swirled.
  • the combustion air spreads to the outer periphery by centrifugal force and becomes easy to mix with the atomized oil.
  • the swirl flow forms a low pressure portion at the center portion of the burner outlet, and a circulating flow is formed in this portion from downstream to upstream. High-temperature burned gas stays in the circulating flow, accelerating the ignition of atomized oil.
  • the turning strength can be changed by changing the degree of pushing the lattice 16a of the movable member 16 into the slit 15a of the fixed plate 15.
  • the swirling flow of the combustion air 12 is preferably about 0.5 to 1.0 in terms of swirl number.
  • lattice 16a can reduce the thermal radiation from the inside of a furnace with the fixed plate 15, and can reduce thermal expansion.
  • the fixed plate 15 of the present embodiment is a pulverized coal burner 20 that is fixed to the tip of the primary air nozzle 1 shown in FIG. 1 and has a configuration in which a movable member 16 is installed on the upstream side thereof.
  • the fixed plate 15 has, for example, a configuration shown in a front view of the fixed plate in FIG. 6A viewed from the furnace side, and a cross-sectional view taken along the line AA in FIG. 6A in FIG. 6B.
  • 6 (c) is a front view of the movable member 16 viewed from the furnace side
  • FIG. 6 (d) is a sectional view taken along the line BB of FIG. 6 (c)
  • FIG. 6 (e) is FIG. It is a CC line cut surface arrow directional view of (c).
  • the flow path which gives the flow velocity of the air jet flow swirling in the circumferential direction from one slit hole 15a of the fixed plate 15 shown in FIG. 6, and gives the flow velocity of the air jet flow in the straight direction from the other slit hole 15b. are arranged in pairs in the circumferential direction around the center of the fixed plate 15.
  • Each of the flow paths of the pair of slits 15a and 15b of the fixed plate shown in FIG. 6 is moved by the movable member 16 having the pair of closing lattices 16a and 16b shown in FIGS. 6 (c) to 6 (e). Close.
  • the grids 16a and 16b of the plurality of movable members 16 are operated members 17 that slide on the outer periphery of the oil ejection nozzle 6 provided on the upstream side of the fixed plate 15 (similar to the operation members 17 attached to the grids 16a shown in FIG. 5). 6 may be the operation members 17 attached to the respective grids 16a and 16b of FIG.
  • the movable member 16 can close the slit hole 15a or the slit hole 15b to switch between the straight combustion flow and the swirl flow of the primary combustion air into the furnace.
  • the slit 15b of the fixed plate 15 is closed by operating the movable member 16 which is a slit closing member, and the swirling combustion air flow from the slit 15a (FIG. 6 ( Combustion air spreads to the outer periphery by centrifugal force and becomes easy to mix with the atomized oil. Further, the swirl flow forms a low pressure portion at the center portion of the burner outlet, and a circulating flow is formed in this portion from downstream to upstream. High-temperature burned gas stays in the circulating flow, accelerating the ignition of atomized oil.
  • the swirling flow of the combustion air 12 is preferably about 0.5 to 1.0 in terms of swirl number.
  • the slit 15a of the fixed plate 15 is closed by the operation of the movable member 16 in FIG. 6, and a straight flow is applied to the combustion air ejected from the slit 15b so that the combustion is performed after the secondary air nozzle 2.
  • the NOx concentration in the combustion gas can be reduced by delaying the mixing of air and pulverized coal and expanding the NOx reduction region.
  • the swirl number of the combustion air 12 during the straight flow is preferably 0.1 or less.
  • FIG. 7 shows a modification of the fixed plate 15 and the movable member 16 shown in FIG. 7 (a) is a front view of the fixed plate as viewed from the furnace side
  • FIG. 7 (b) is a cross-sectional view taken along the line AA in FIG. 7 (a)
  • FIG. 7 D is a cross-sectional view taken along the line BB in FIG. 7C
  • FIG. 7E is a cross-sectional view taken along the line CC in FIG. 7C. It is.
  • a plurality of pairs of slits 15a and 15b each having an inclined wall surface are provided on the fixed plate 15 at opposing positions, and the pair of slits 15a pivots in the circumferential direction.
  • a pair of flow paths that give the flow velocity of the air jet flow and give the flow velocity of the air jet flow in the direction of turning in the circumferential direction also from the other slit hole 15 b A configuration may be adopted in which a plurality are arranged uniformly.
  • the flow path of one of the pair of slits 15a and 15b of the fixed plate 15 is closed by the pair of lattices 16a and 16b of the movable member 16 for closing the slit disposed upstream and backward of the fixed plate 15.
  • the grids 16a and 16b are respectively connected to the grids 16a and 16b like the operation members 17 that slide on the outer periphery of the oil jet nozzle 6 provided on the upstream side of the fixed plate 15 (the operation members 17 attached to the grids 16a shown in FIG. 5).
  • the operation member 17 may be attached to the operation member 17, and the operation members 17 are arranged so as to freely advance and retract.
  • the slit closing member 15 is operated to close the slit 15a or the slit 15b of the fixing plate 15 and open to open the swirling combustion air from the slit 15a or the slit 15b.
  • the combustion air spreads to the outer periphery by centrifugal force and becomes easy to mix with the atomized oil.
  • the swirl flow forms a low pressure portion at the center portion of the burner outlet, and a circulating flow is formed in this portion from downstream to upstream. High-temperature burned gas stays in the circulating flow, accelerating the ignition of atomized oil.
  • the swirling flow of the combustion air 12 is preferably about 0.5 to 1.0 in terms of swirl number.
  • the slit closing member in FIG. 7 is retracted to open both the slit 15a and the slit 15b of the fixed plate 15 to give a straight flow to the combustion air ejected from the slits 15a and 15b.
  • the NOx concentration in the combustion gas can be reduced by delaying the mixing of the combustion air and the pulverized coal after the secondary air nozzle and expanding the NOx reduction region.
  • the swirl number of the combustion air 12 during the straight flow is preferably 0.1 or less.
  • the lattices 16a and 16b shown in FIGS. 6 and 7 may be integrated to form a single triangular lattice.
  • the pulverized coal burner 20 of the present embodiment is the same as the cross-sectional structure of the pulverized coal burner 20 shown in FIG. 1, and the fixed plate 15 disposed at the tip of the primary air nozzle 1 is viewed from the furnace side of FIG.
  • the front view is shown in FIG. 8 (b) in FIG. 8 (c) is a front view of the movable member 16 viewed from the furnace side, FIG. 8 (d) is a sectional view taken along the line BB of FIG. 8 (c), and FIG. 8 (e) is a diagram.
  • FIG. 8C is a sectional view taken along the line CC of FIG.
  • the fixed plate 15 shown in FIG. 8 has the same configuration as the fixed plate 15 shown in FIG.
  • the movable member 16 of the present embodiment has the same structure as that of the movable member 16 shown in FIG. 3, but the air-permeable plate 18 having a large number of air holes 18 a is adhered to the opposite side (back surface) of the movable member 16 to the furnace. Arranged.
  • the end of the movable member 16 on the burner center side is fixed to a cylindrical operation member 17 having a diameter larger than the outer diameter of the oil spray nozzle 6.
  • the air-permeable plate 18 is provided with a plurality of ejection holes 18a so as to be positioned between the lattices 16a of the movable member 16, and a plurality of the ejection holes 18a are radially provided from the center of the burner. Yes.
  • the fixed plate 15 is cooled by impingement cooling by the air flow ejected from the plurality of ejection holes 18a to prevent burning.
  • the movable member 16 can be driven in the front-rear direction toward the furnace, and moves toward the furnace during oil-only firing at the time of start-up, pushing the lattice 16a into the slit holes 15a of the fixed plate 15, so that the slit holes 15a
  • a swirling flow is given to the jetting combustion air 12, and the combustion air 12 spreads to the outer peripheral side of the primary air nozzle 1 by centrifugal force and is atomized oil Easy to mix with.
  • a low pressure portion is formed in the central portion of the primary air nozzle 1, and a circulating flow from downstream to upstream is formed in this portion. High-temperature burned gas stays in the circulating flow, accelerating the ignition of atomized oil.
  • the swirling flow of the combustion air 12 is preferably about 0.5 to 1.0 in terms of swirl number.
  • the movable member 16 is pulled in a direction away from the furnace, and a straight flow is applied to the combustion air 12 ejected from the primary air nozzle 1 so that the combustion air after the secondary air nozzle
  • the NOx concentration in the fuel gas can be reduced by delaying mixing and expanding the NOx reduction region.
  • the swirl number of the combustion air 12 during the straight flow is preferably 0.1 or less.
  • the drive part of the said movable member 16 exists in the upstream of the burner 20 rather than the fixed plate 15, the thermal radiation from the inside of a furnace can be reduced and thermal expansion can be reduced.
  • FIG. 9 shows the effect of reducing the NOx concentration in the combustion gas with respect to the primary air flow rate according to each of the above embodiments.
  • the present invention can improve the ignitability of oil and pulverized coal when starting the pulverized coal burner 20 with a simple configuration, and can reduce the NOx concentration of the combustion gas.

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

Abstract

La présente invention concerne un brûleur de charbon pulvérisé (20) comprenant un gicleur d’huile (6), une buse d'air primaire (1), une buse de charbon pulvérisé (4), et des buses d'air (2, 3). Une plaque fixe (15) et un élément mobile (16) sont disposés sur une paroi périphérique intérieure de l'extrémité avant de la buse d'air primaire (1). La plaque fixe (15) est munie de trous en forme de fente (15a) qui possèdent chacun une paire de surfaces de paroi opposées dont une section d'ouverture se réduit progressivement du côté amont vers le côté aval. L'élément mobile (16) est monté en amont de la plaque fixe (15) dans la buse d'air primaire (1), ce qui lui permet ainsi d'avancer et de se rétracter. L'élément mobile (16) comporte des grilles (16a) qui sont adaptées pour fermer les trous en forme de fente (15a) et qui sont disposées selon une configuration radiale à des positions qui correspondent aux trous en forme de fente (15a). Le degré d'insertion de chaque grille (16a) dans un trou en forme de fente correspondant est ajusté de façon à fermer l’un des espaces d’une paire d'espaces (h) formés entre la grille (16a) et la paire de surfaces de paroi opposées du trou en forme de fente (15a), et pour amener de l'air primaire éjecté à partir de l'autre espace (h) à tourbillonner. Le flux tourbillonnant de l'air primaire est éjecté dans un four, afin de faciliter le mélange de l'air primaire et d'huile atomisée éjectée par le gicleur d’huile (6). Grâce à cette structure, la concentration en NOx dans un gaz de combustion est réduite tandis que l'inflammabilité de l'huile se maintient à un niveau élevé.
PCT/JP2009/001648 2008-04-24 2009-04-09 Brûleur de charbon pulvérisé WO2009130857A1 (fr)

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FI20106233A FI20106233A (fi) 2008-04-24 2010-11-23 Hiilipölypoltin

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JP2008113963A JP2009264654A (ja) 2008-04-24 2008-04-24 微粉炭バーナ
JP2008-113963 2008-04-24

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CN103134050A (zh) * 2013-03-07 2013-06-05 上海锅炉厂有限公司 一种带有间隙风的多煤种低氮煤粉燃烧装置
CN103307595A (zh) * 2013-06-25 2013-09-18 山西蓝天环保设备有限公司 一种扩展中小型工业煤粉锅炉适用煤种的装置及方法
GB2513389A (en) * 2013-04-25 2014-10-29 Rjm Corp Ec Ltd Nozzle for power station burner and method for the use thereof
CN105910107A (zh) * 2016-04-19 2016-08-31 上海发电设备成套设计研究院 一种同心轴流式低氮氧化物套管燃烧器
WO2016199613A1 (fr) * 2015-06-12 2016-12-15 三菱日立パワーシステムズ株式会社 Brûleur, dispositif de combustion, chaudière, et procédé de commande de brûleur
CN107442767A (zh) * 2017-08-16 2017-12-08 中国重汽集团杭州发动机有限公司 铁水浇注包燃油烘烤装置
CN110566941A (zh) * 2019-09-19 2019-12-13 哈尔滨锅炉厂有限责任公司 一种新型贫煤次烟煤用燃气旋流燃烧器
TWI785307B (zh) * 2019-02-13 2022-12-01 日商三菱動力股份有限公司 後通氣孔及具備其之燃燒裝置

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AT507901B1 (de) * 2009-05-19 2010-09-15 Unitherm Cemcon Feuerungsanlag Dralleinstellvorrichtung für einen brenner
JP2012122653A (ja) * 2010-12-07 2012-06-28 Mitsubishi Heavy Ind Ltd 燃焼バーナ
JP5730131B2 (ja) * 2011-05-31 2015-06-03 三菱日立パワーシステムズ株式会社 固体燃料バーナ
JP6011073B2 (ja) 2012-07-02 2016-10-19 株式会社Ihi バーナ
CN103017162A (zh) * 2012-12-28 2013-04-03 北京哈宜节能环保科技开发有限公司 一种燃烧器喷管及燃烧器
KR101368360B1 (ko) 2013-01-30 2014-03-03 현대제철 주식회사 버너
JP6799687B1 (ja) * 2019-03-19 2020-12-16 太平洋セメント株式会社 セメントキルン用バーナ装置及びその運転方法
CN110953580B (zh) * 2019-11-18 2021-07-23 上海发电设备成套设计研究院有限责任公司 一种用于柴油机的补燃燃烧器

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CN103134050A (zh) * 2013-03-07 2013-06-05 上海锅炉厂有限公司 一种带有间隙风的多煤种低氮煤粉燃烧装置
CN103134050B (zh) * 2013-03-07 2015-04-08 上海锅炉厂有限公司 一种带有间隙风的多煤种低氮煤粉燃烧装置
GB2513389A (en) * 2013-04-25 2014-10-29 Rjm Corp Ec Ltd Nozzle for power station burner and method for the use thereof
US9599334B2 (en) 2013-04-25 2017-03-21 Rjm Corporation (Ec) Limited Nozzle for power station burner and method for the use thereof
CN103307595A (zh) * 2013-06-25 2013-09-18 山西蓝天环保设备有限公司 一种扩展中小型工业煤粉锅炉适用煤种的装置及方法
JP2017003216A (ja) * 2015-06-12 2017-01-05 三菱日立パワーシステムズ株式会社 バーナ、燃焼装置、ボイラ及びバーナの制御方法
WO2016199613A1 (fr) * 2015-06-12 2016-12-15 三菱日立パワーシステムズ株式会社 Brûleur, dispositif de combustion, chaudière, et procédé de commande de brûleur
CN107532795A (zh) * 2015-06-12 2018-01-02 三菱日立电力系统株式会社 燃烧器、燃烧装置、锅炉及燃烧器的控制方法
EP3276260A4 (fr) * 2015-06-12 2018-06-20 Mitsubishi Hitachi Power Systems, Ltd. Brûleur, dispositif de combustion, chaudière, et procédé de commande de brûleur
AU2016274736B2 (en) * 2015-06-12 2019-06-13 Mitsubishi Power, Ltd. Burner, combustion device, boiler, and burner control method
US10591156B2 (en) 2015-06-12 2020-03-17 Mitsubishi Hitachi Power Systems, Ltd. Burner, combustion device, boiler, and burner control method
CN105910107A (zh) * 2016-04-19 2016-08-31 上海发电设备成套设计研究院 一种同心轴流式低氮氧化物套管燃烧器
CN107442767A (zh) * 2017-08-16 2017-12-08 中国重汽集团杭州发动机有限公司 铁水浇注包燃油烘烤装置
TWI785307B (zh) * 2019-02-13 2022-12-01 日商三菱動力股份有限公司 後通氣孔及具備其之燃燒裝置
CN110566941A (zh) * 2019-09-19 2019-12-13 哈尔滨锅炉厂有限责任公司 一种新型贫煤次烟煤用燃气旋流燃烧器

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