JP7074558B2 - Burner - Google Patents

Description

The present invention relates to a burner that burns in two stages by a first-stage combustion unit and a second-stage combustion unit.

Some burners used for commercial use, industrial use, etc. burn fuel gas or fuel with combustion air to form a flame, and heat an object to be heated by radiant heat from the flame. For example, in the flame-generating combustion method of Patent Document 1, the fuel is primary-combusted with primary air of 15% or less of the total air volume, and the primary combustion gas is secondary air having a flow velocity three times or more that of the primary combustion gas. Is described to be mixed. Further, Patent Document 1 describes that soot and radiant flame are generated by combustion heat and radiant heat. A burner that generates such a bright flame is generally called a bright flame burner.

Japanese Unexamined Patent Publication No. 63-55602

However, in the conventional bright flame burner such as Patent Document 1, although it glows yellow in the visible light region, it has been found that further ingenuity is required in order to increase the amount of radiant heat transfer. In Patent Document 1, although the flow velocity of the secondary air is increased as compared with the flow velocity of the primary air, no device is made to change the flow velocity, the flow rate, etc. of the fuel. It was also found that the structure of the burner needs to be further devised in order to increase the amount of radiant heat transfer.

The present invention has been made in view of the above problems, and when a carbon-derived component and an unburned component are appropriately generated and the carbon-derived component and the unburned component are completely burned to heat an object to be heated. It was obtained in an attempt to provide a burner capable of increasing the amount of radiant heat transfer.

In one aspect of the present invention, the first fuel and the first combustion air are burned to form a first flame, and the first flame heats a second fuel separately supplied from the first fuel. , The first-stage combustion unit that produces carbon-derived components and unburned components in the second fuel,
The second fuel, which is ignited by the first flame and contains the carbon-derived component and the unburned component, and the second combustion air supplied separately from the first combustion air completely burn and the second flame. It is equipped with a second stage combustion part, which forms a
The first stage combustion part is
The first fuel cylinder through which the first fuel passes and is ejected,
A second fuel cylinder through which the second fuel passes and is ejected on the inner peripheral side of the first fuel cylinder, and
On the outer peripheral side of the first fuel cylinder, the ejection cylinder portion through which the first combustion air passes and is ejected, and the ejection cylinder portion is formed so as to extend from the ejection cylinder portion to the tip end side in the axial direction of the ejection cylinder portion. It has a first air cylinder having a heating cylinder portion for heating the second fuel by the first flame, and has.
The second stage combustion part is
The burner has a second air cylinder on which the second combustion air passes and is ejected on the outer peripheral side of the first air cylinder .
In another aspect of the present invention, the first fuel and the first combustion air are burned to form a first flame, and the first flame heats a second fuel separately supplied from the first fuel. The first-stage combustion unit that produces carbon-derived components and unburned components in the second fuel,
The second fuel, which is ignited by the first flame and contains the carbon-derived component and the unburned component, and the second combustion air supplied separately from the first combustion air completely burn and the second flame. It is equipped with a second stage combustion part, which forms a
The first stage combustion part is
A mixing cylinder in which an air-fuel mixture in which the first fuel and the first combustion air are mixed passes and is ejected, and the air-fuel mixture forms the first flame.
On the outer peripheral side of the mixing cylinder, the passing cylinder portion through which the second fuel passes and the passing cylinder portion extending from the passing cylinder portion to the tip end side in the axial direction are formed, and the second fuel is formed by the first flame. With a fuel cylinder, which has a heating cylinder for heating,
The second stage combustion part is
The burner has an air cylinder on the outer peripheral side of the fuel cylinder through which the second combustion air passes and is ejected.
In still another aspect of the present invention, the first fuel and the first combustion air are burned to form a first flame, and the first flame heats a second fuel separately supplied from the first fuel. Then, the first-stage combustion unit that generates carbon-derived components and unburned components in the second fuel,
The second fuel, which is ignited by the first flame and contains the carbon-derived component and the unburned component, and the second combustion air supplied separately from the first combustion air completely burn and the second flame. It is equipped with a second stage combustion part, which forms a
The first stage combustion part is
An air-fuel mixture in which the first fuel and the first combustion air are mixed passes through and is ejected to the inner peripheral side, and the air-fuel mixture forms a first flame by the air-fuel mixture.
On the inner peripheral side of the mixing cylinder, the passing cylinder portion through which the second fuel passes and the passing cylinder portion extending from the passing cylinder portion to the tip end side in the axial direction are formed, and the second flame is formed. With a fuel cylinder having a heating cylinder portion for heating the fuel,
The second stage combustion part is
The burner has an air cylinder on the outer peripheral side of the fuel cylinder through which the second combustion air passes and is ejected.

In the burner of each aspect, carbon-derived components and unburned components are generated in the second fuel by performing combustion in two stages of the first stage combustion part and the second stage combustion part, and then the second fuel. Is completely burned. Then, in the second stage combustion unit, a large radiant heat can be generated from the second flame by forming the second flame in which the carbon-derived component and the unburned component in the second fuel are completely burned. As a result, the amount of radiant heat transfer when heating the object to be heated can be further increased.

In particular, in the first-stage combustion unit, a first fuel that burns with the first combustion air to form a first flame and a second fuel that is heated by the first flame are used. Then, by using the second fuel separately from the first fuel, carbon-derived components and unburned components can be effectively produced. In addition, all of the first fuel may be used for combustion with the first combustion air, and even if all of the first fuel and a part of the second fuel are used for combustion with the first combustion air. good. Further, a part of the first fuel may be used for combustion with the first combustion air.

Further, by using the second fuel supplied separately from the first fuel and the second combustion air supplied separately from the first combustion air, carbon-derived components and unburned components are appropriately generated and carbon-derived. The components and unburned components can be properly and completely burned.

Therefore, according to the burner of each of the above-described embodiments, the carbon-derived component and the unburned component are appropriately generated, and the carbon-derived component and the unburned component are completely burned, thereby transmitting radiation when heating the object to be heated. The amount of heat can be increased.

The supply of the second fuel to the burner can be larger than the supply of the first fuel to the burner. Further, the first fuel and the second fuel may be fuels having the same composition or fuels having different compositions. Further, the supply amount of the second combustion air to the burner can be larger than the supply amount of the first combustion air to the burner. Further, the first combustion air and the second combustion air may be air having the same oxygen concentration or air having different oxygen concentrations.

FIG. 6 is a cross-sectional view showing a burner according to the first embodiment. FIG. 5 is an enlarged sectional view showing a burner according to the first embodiment. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2, showing a burner according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line IV-IV of FIG. 2, showing a burner according to the first embodiment. FIG. 5 is an enlarged cross-sectional view showing another burner according to the first embodiment. FIG. 5 is a sectional view taken along line VI-VI of FIG. 5, showing another burner according to the first embodiment. FIG. 2 is a cross-sectional view showing a burner according to the second embodiment. FIG. 2 is an enlarged cross-sectional view showing the burner according to the second embodiment. FIG. 6 is a cross-sectional view taken along the line IX-IX of FIG. 8 showing a burner according to the second embodiment. It is a figure which shows the burner which concerns on Embodiment 2, and is the XX sectional view of FIG. It is a figure which shows the other burner which concerns on Embodiment 2, and is the IX-IX cross-sectional correspondence figure of FIG. FIG. 2 is an enlarged cross-sectional view showing another burner according to the second embodiment. FIG. 3 is a cross-sectional view showing a burner according to the third embodiment. FIG. 3 is an enlarged cross-sectional view showing the burner according to the third embodiment. FIG. 6 is a cross-sectional view taken along the line XV-XV of FIG. 14 showing a burner according to the third embodiment. FIG. 6 is a cross-sectional view taken along the line XVI-XVI of FIG. 14 showing a burner according to the third embodiment.

A preferred embodiment of the burner described above will be described with reference to the drawings.
<Embodiment 1>
As shown in FIGS. 1 and 2, the burner 1 of the present embodiment includes a first-stage combustion unit 11 and a second-stage combustion unit 12. In the first-stage combustion unit 11, the first fuel F1 and the first combustion air A1 burn to form the first flame H1, and the second fuel supplied separately from the first fuel F1 by the first flame H1. This is a portion where F2 is heated to generate carbon-derived components and unburned components in the second fuel F2. The second-stage combustion unit 12 is ignited by the first flame H1 and has a second fuel F2 containing a carbon-derived component and an unburned component, and a second combustion air A2 supplied separately from the first combustion air A1. It is a part that completely burns to form the second flame H2.

The burner 1 of this embodiment will be described in detail below.
In the present embodiment, the "axial direction L" means the direction along the central axis O of the burner 1. Further, the "axial direction L" is indicated as the axial direction L or the like of the first air cylinder 3 described later. Further, the "circumferential direction C" means the direction around the central axis O of the burner 1. The "tip side L1 in the axial direction L" means the side where the flames H1 and H2 are formed in the axial direction L of the burner 1. In this embodiment, the "tip side L1 in the axial direction L" is the upper side in the vertical direction.

As shown in FIG. 1, the burner 1 of the present embodiment is attached to an industrial furnace for commercial use, industrial use, etc., and heats an object to be heated arranged in the industrial furnace by radiant heat generated from flames H1 and H2. It is something to do. The industrial furnace can be various furnaces such as a heating furnace, a heat treatment furnace, and a carburizing furnace. The burner 1 is a gas burner that burns using a fuel gas such as city gas. The burner 1 is arranged in parallel in the vertical direction and is used in a state of forming flames H1 and H2 above. The burner 1 may be used in a state of being slightly inclined with respect to the vertical direction.

As shown in FIGS. 1 and 2, the first-stage combustion unit 11 of the present embodiment has a first fuel cylinder 21 through which the first fuel F1 is passed and ejected, and a first fuel cylinder 21 on the inner peripheral side of the first fuel cylinder 21. 2 It has a second fuel cylinder 22 through which the fuel F2 passes and is ejected, and a first air cylinder 3 through which the first combustion air A1 is passed and ejected on the outer peripheral side of the first fuel cylinder 21. The first air cylinder 3 is composed of an ejection cylinder portion 31 and a heating cylinder portion 32. The ejection cylinder portion 31 is a portion arranged on the outer peripheral side of the first fuel cylinder 21 and through which the first combustion air A1 passes and is ejected. The heating cylinder portion 32 is formed so as to extend from the ejection cylinder portion 31 to the tip end side L1 in the axial direction L of the ejection cylinder portion 31, and is a portion for heating the second fuel F2 by the first flame H1.

The second-stage combustion unit 12 of the present embodiment has a second air cylinder 4 through which the second combustion air A2 passes and is ejected on the outer peripheral side of the heating cylinder unit 32. The second air cylinder 4 is configured to eject the second combustion air A2 from each portion or the entire circumference of the heating cylinder portion 32 in the circumferential direction C.

Fuel gas is used for both the first fuel F1 and the second fuel F2. A fuel gas having the same composition is used for the first fuel F1 and the second fuel F2 of the present embodiment. Fuel gases having different compositions may be used for the first fuel F1 and the second fuel F2. Further, liquid fuel (oil fuel) can also be used as the first fuel F1 and the second fuel F2. In this case, a configuration for injecting liquid fuel can be adopted.

In this embodiment, in order to appropriately generate carbon-derived components and unburned components in the second fuel F2, the supply amount (flow rate) of the second fuel F2 to the burner 1 is the first fuel F1 to the burner 1. It can be larger than the supply amount (flow rate) of. The flow rate of the first fuel F1 can be determined in consideration of the ease of combustion with the first combustion air A1 and the temperature of the flame H1 for heating the second fuel F2 by this combustion.

Further, the ratio of increasing the flow rate of the second fuel F2 to the flow rate of the first fuel F1 is such that the combustion of the first fuel F1 and the second fuel F2 is stable and the first fuel F1 and the second fuel F2 are used. It can be set within a range in which carbon-derived components and unburned components can be appropriately generated. Further, for example, the flow rate of the first fuel F1 can be made larger than the flow rate of the second fuel F2.

The supply amount (flow rate) of the second combustion air A2 to the burner 1 can be larger than the supply amount (flow rate) of the first combustion air A1 to the burner 1. The ratio of the flow rate of the first combustion air A1 to the flow rate of the second combustion air A2 can be appropriately set according to the ratio of the flow rate of the first fuel F1 and the flow rate of the second fuel F2. Further, for example, the flow rate of the first combustion air A1 can be made larger than the flow rate of the second combustion air A2.

As the first combustion air A1, in addition to fresh air as the atmosphere, oxygen-enriched air, oxygen (pure oxygen) and the like can be used. As the second combustion air A2, oxygen-enriched air, oxygen (pure oxygen), or the like can be used in addition to fresh air as the atmosphere. Oxygen-enriched air refers to air with a higher oxygen concentration than the atmosphere.

Further, preheated air heated to a predetermined temperature can be used for at least one of the first combustion air A1 and the second combustion air A2. At least one of the first combustion air A1 and the second combustion air A2 may be, for example, mixed with the exhaust gas generated after the combustion of the burner 1 to be preheated air.

As shown in FIG. 2, the first fuel cylinder 21 and the second fuel cylinder 22 of the present embodiment form a double pipe overlapping on the inner peripheral side and the outer peripheral side. The first fuel cylinder 21 constitutes a pipe on the outer peripheral side, and the second fuel cylinder 22 constitutes a pipe on the inner peripheral side. The first fuel F1 is ejected upward from the tip opening 211 of the first fuel cylinder 21. The second fuel F2 is ejected upward from the tip opening 221 of the second fuel cylinder 22.

The first air cylinder 3 is formed as a cylindrical body having a closed bottom and an open ceiling. Further, in the first air cylinder 3, a partition member 33 for partitioning the ejection cylinder portion 31 and the heating cylinder portion 32 is arranged. The partition member 33 is formed by a disk-shaped member arranged on the outer peripheral side from the tip end portion of the first fuel cylinder 21. At least one of the first fuel cylinder 21 and the second fuel cylinder 22 may be projected from the partition member 33 toward the tip end side L1 in the axial direction L.

As shown in FIGS. 2 and 3, the ejection cylinder portion 31 is swirled by the first combustion air A1 flowing into the ejection cylinder portion 31 along the circumferential direction C of the ejection cylinder portion 31. It is configured to form a stream. The swirling flow of the first combustion air A1 is formed as a swirling flow around the central axis of the first air cylinder 3 (and the ejection cylinder portion 31). In other words, the swirling flow of the first combustion air A1 swirls the annular space 311 formed between the first air cylinder 3 and the first fuel cylinder 21 in the circumferential direction C of the first air cylinder 3. Form a flow.

An inlet portion 34 of the first combustion air A1 for flowing the first combustion air A1 into the first air cylinder 3 is connected to the outer peripheral portion of the ejection cylinder portion 31 of the first air cylinder 3. The inlet portion 34 of the first combustion air A1 can be connected to one or a plurality of locations in the circumferential direction C on the outer peripheral portion of the ejection cylinder portion 31. The pipe 341 constituting the inlet portion 34 of the first combustion air A1 is arranged along the circumferential direction C of the ejection cylinder portion 31. Further, the inlet portion 34 of the first combustion air A1 is a lower end portion (base end portion) of the first air cylinder 3 (spout cylinder portion 31) in order to move the first combustion air A1 upward while swirling. It is located in the vicinity of.

As shown in FIG. 2, the ejection cylinder portion 31 is formed with an outer peripheral ejection portion 312 and an inner peripheral ejection portion 313 for ejecting the first combustion air A1. More specifically, the outer peripheral ejection portion 312 is formed on the outer peripheral portion in the ejection cylinder portion 31 and ejects a part of the swirling flow of the first combustion air A1. In other words, the outer peripheral ejection portion 312 is formed as an annular gap between the outer peripheral end portion of the partition member 33 and the inner peripheral surface of the ejection cylinder portion 31.

Further, the inner peripheral ejection portion 313 is formed at a plurality of locations in the circumferential direction C at a position on the inner peripheral side of the outer peripheral ejecting portion 312 and on the outer peripheral side of the first fuel cylinder 21. The balance of the swirling flow of the combustion air A1 is ejected. In other words, the inner peripheral ejection portion 313 is formed as a plurality of ejection holes on the plate surface of the partition member 33 to eject the first combustion air A1.

Further, as shown in FIGS. 2 and 3, the inner peripheral ejection portion 313 is formed so as to project from the position where the outer peripheral ejection portion 312 is formed to the tip end side L1 in the axial direction L of the first air cylinder 3. .. In other words, the inner peripheral ejection portion 313 is formed by a projecting member 314 provided on the partition member 33 so as to project from the partition member 33 to the tip end side L1 in the axial direction L.

By forming the inner peripheral ejection portion 313 at the tip end portion of the projecting member 314, a small flame for holding a flame can be formed at the tip end portion of the projecting member 314. A plurality of inner peripheral ejection portions 313 and protruding members 314 are arranged side by side in the circumferential direction C around the central axis of the first air cylinder 3. In other words, the inner peripheral ejection portion 313 and the projecting member 314 are arranged so as to spread radially around the central axis of the first air cylinder 3.

The heating cylinder portion 32 is formed as a portion located on the tip end side L1 in the axial direction L of the first air cylinder 3. The tip of the heating cylinder 32 is opened as the tip opening 35 of the first air cylinder 3. The first fuel F1 ejected upward from the first fuel cylinder 21 and the first combustion air A1 ejected upward from the outer peripheral ejection portion 312 and the inner peripheral ejection portion 313 burn in the heating cylinder portion 32. .. The mixture G in which the first fuel F1 and the first combustion air A1 are mixed can be ignited by various methods such as sparking and a pilot flame for flame holding.

When the first fuel F1 and the first combustion air A1 burn, the first flame H1 due to the combustion of the first fuel F1 and the first combustion air A1 ejects upward from the second fuel cylinder 22. 2 Fuel F2 is heated. The second fuel F2 is ejected upward so as to pass through the central portion of the first flame H1.

As shown in FIGS. 2 and 4, the second air cylinder 4 is formed as an annular cylinder arranged on the outer peripheral side of the heating cylinder portion 32 of the first air cylinder 3. On the inner peripheral side of the second air cylinder 4 and on the outer peripheral portion of the heating cylinder portion 32, a second combustion air A2 supplied into the second air cylinder 4 is ejected into the heating cylinder portion 32. A plurality of holes (slits) 41A are formed. At the end of the tip side L1 of the second air cylinder 4 in the axial direction L, a ejection hole for ejecting the second combustion air A2 supplied into the second air cylinder 4 to the tip side L1 in the axial direction L. A plurality of (slits) 41B are formed.

By ejecting the second combustion air A2 into the heating cylinder portion 32, it is possible to suppress the adhesion of carbon-derived components such as soot to the heating cylinder portion 32. The ejection holes 41A and 41B are formed at a plurality of locations in the circumferential direction C of the heating cylinder portion 32. The ejection hole 41A can be formed into a long shape in the axial direction L along the axial direction L of the second air cylinder 4. The second combustion air A2 is ejected from the second air cylinder 4 to the inner peripheral side and the tip side L1 of the heating cylinder portion 32 by the ejection holes 41A and 41B, respectively.

As shown in FIG. 4, in the second air cylinder 4, the second combustion air A2 is swirled by the second combustion air A2 flowing into the second air cylinder 4 along the circumferential direction C of the second air cylinder 4. It is configured to form a stream. An annular space 411 through which the swirling flow of the second combustion air A2 passes is formed between the outer circumference of the heating cylinder portion 32 of the first air cylinder 3 and the inner circumference of the second air cylinder 4.

An inlet portion 42 of the second combustion air A2 for allowing the second combustion air A2 to flow into the second air cylinder 4 is provided on the outer peripheral portion of the second air cylinder 4. The inlet portion 42 of the second combustion air A2 can be provided at one or a plurality of locations in the circumferential direction C on the outer peripheral portion of the second air cylinder 4. The pipe 421 constituting the inlet portion 42 of the second combustion air A2 is arranged along the circumferential direction C of the second air cylinder 4. Further, the inlet portion 42 of the second combustion air A2 is arranged in the vicinity of the base end portion (lower end portion) of the second air cylinder 4 in order to move the second combustion air A2 upward while swirling. There is.

Further, as shown in FIGS. 5 and 6, in the second air cylinder 4, a swirl for forming a swirling flow of the second combustion air A2 at a plurality of locations in the circumferential direction C of the second air cylinder 4 is formed. Wings 43 can be placed. The swivel blade 43 is composed of a plate-shaped member with which the fluid collides, and is for regulating the flow of the colliding fluid. The swivel blades 43 are arranged so as to line up around the heating cylinder portion 32. In other words, the swivel blades 43 are arranged in a state of being arranged in a plurality of circumferential directions C in the second air cylinder 4. When the swivel blade 43 is arranged in the second air cylinder 4, the second combustion air A2 in the second air cylinder 4 can be swirled more easily.

In the second air cylinder 4, only a plurality of ejection holes 41B for ejecting the second combustion air A2 to the tip side L1 in the axial direction L can be formed. Further, the second air cylinder 4 may be formed with only a plurality of ejection holes 41A for ejecting the second combustion air A2 toward the inner peripheral side of the heating cylinder portion 32.

As shown in FIG. 2, when the first combustion air A1 flows into the ejection cylinder portion 31 of the first air cylinder 3 from the inlet portion 34 of the first combustion air A1, it swirls around the first fuel cylinder 21. A swirling flow of the first combustion air A1 that rises while being formed is formed. Then, the first combustion air A1 is ejected from the outer peripheral ejection portion 312 of the ejection cylinder portion 31 into the heating cylinder portion 32, and is also ejected from the inner peripheral ejection portion 313 of the ejection cylinder portion 31 into the heating cylinder portion 32. To.

Further, the first fuel F1 rising in the first fuel cylinder 21 is ejected from the tip opening 211 of the first fuel cylinder 21 into the heating cylinder portion 32. Further, the second fuel F2 rising in the second fuel cylinder 22 is ejected from the tip opening 221 of the second fuel cylinder 22 into the heating cylinder portion 32. Then, the first fuel F1 ejected into the heating cylinder portion 32 is mixed with the first combustion air A1 ejected into the heating cylinder portion 32 and burned to form the first flame H1. Further, the second fuel F2 rising in the second fuel cylinder 22 is heated by the first flame H1 in the heating cylinder portion 32.

Further, the second fuel F2 passing through the heating cylinder portion 32 is heated by the first flame H1 and burns with the second combustion air A2 ejected from the second air cylinder 4 into the heating cylinder portion 32. .. Then, the second flame H2 is formed so as to overlap the first flame H1 by the combustion of the second fuel F2 and the second combustion air A2.

(Action effect)
In the burner 1 of the present embodiment, carbon-derived components and unburned components are generated in the second fuel F2 by performing combustion in two stages of the first-stage combustion unit 11 and the second-stage combustion unit 12, and then, The second fuel F2 is completely burned. Carbon-derived components include soot and the like, and unburned components include hydrocarbons such as methane, hydrogen, carbon monoxide and the like. Then, in the second stage combustion unit 12, a large radiant heat can be generated from the second flame H2 by forming the second flame H2 in which the carbon-derived component and the unburned component in the second fuel F2 are completely burned. can. As a result, the amount of radiant heat transfer when the object to be heated is heated by the burner 1 can be further increased.

In particular, in the first-stage combustion unit 11, a first fuel F1 that burns with the first combustion air A1 to form a first flame H1 and a second fuel F2 heated by the first flame H1 are used. .. Then, by using the second fuel F2 separately from the first fuel F1, carbon-derived components and unburned components can be effectively produced. In addition, all of the first fuel F1 may be used for combustion with the first combustion air A1, and all of the first fuel F1 and a part of the second fuel F2 are used for combustion with the first combustion air A1. May be used. Further, a part of the first fuel F1 may be used for combustion with the first combustion air A1.

Further, by increasing the amount of the second fuel F2 as compared with the first fuel F1 and increasing the amount of the second combustion air A2 as compared with the first combustion air A1, carbon-derived components and unburned components are appropriately generated. However, carbon-derived components and unburned components can be properly and completely burned.

Further, in the present embodiment, the first fuel F1 is mixed with the first combustion air A1 ejected from the inner peripheral ejection portion 313 and burned. Further, the first combustion air A1 ejected from the outer peripheral ejection portion 312 rises along the inner peripheral surface of the first air cylinder 3. Then, the first fuel F1 is also mixed with the first combustion air A1 ejected from the outer peripheral ejection portion 312 and burned. The first combustion air A1 ejected from the outer peripheral ejection portion 312 can prevent soot or the like as a carbon-derived component contained in the first fuel F1 from adhering to the inner peripheral surface of the first air cylinder 3. ..

Therefore, according to the burner 1 of the present embodiment, the carbon-derived component and the unburned component are appropriately generated, and the carbon-derived component and the unburned component are completely combusted, thereby transmitting radiation when heating the object to be heated. The amount of heat can be increased.

<Embodiment 2>
This embodiment particularly shows a case where the configuration of the first-stage combustion unit 11 is different from the configuration shown in the first embodiment.
As shown in FIGS. 7 and 8, the first-stage combustion unit 11 of the present embodiment has a mixing cylinder 5 and a fuel cylinder 6. The mixing cylinder 5 is configured such that the air-fuel mixture G in which the first fuel F1 and the first combustion air A1 are mixed passes through and is ejected to form the first flame H1 by the air-fuel mixture G. The fuel cylinder 6 is formed on the outer peripheral side of the mixing cylinder 5 so as to extend from the passing cylinder portion 61 to the passing cylinder portion 61 through which the second fuel F2 passes and the tip side L1 of the passing cylinder portion 61 in the axial direction L. It has a heating cylinder portion 62 for heating the second fuel F2 by one flame H1.

As shown in FIGS. 8 and 9, the mixing cylinder 5 is configured to form a swirling flow of the air-fuel mixture G by the air-fuel mixture G flowing into the mixing cylinder 5 along the circumferential direction C of the mixing cylinder 5. .. A stabilizer (shaft portion) 53 is arranged along the central axis at the center of the mixing cylinder 5 (position of the center axis). The stabilizer 53 is for reducing the fluctuation of the flow in the central portion of the swirling flow of the air-fuel mixture G in the mixing cylinder 5, and stably holding the first flame H1 and the second flame H2. An inlet portion 54 of the air-fuel mixture G is connected to the vicinity of the base end portion of the mixing cylinder 5. The inlet portion 54 of the air-fuel mixture G may be provided at one or a plurality of locations in the circumferential direction C on the outer peripheral portion of the mixing cylinder 5. The pipe 541 constituting the inlet portion 54 of the air-fuel mixture G is arranged along the circumferential direction C of the mixing cylinder 5. At the tip of the mixing cylinder 5, a tip ejection portion 51 as an opening is formed to eject a swirling flow of the air-fuel mixture G.

A tapered portion 52 having a diameter reduced toward the tip side L1 in the axial direction L of the mixing cylinder 5 is formed in the tip end side portion of the mixing cylinder 5. The tip ejection portion 51 is formed in an opening at the tip position of the tapered portion 52.

As shown in FIGS. 8 and 9, the passing cylinder portion 61 of the fuel cylinder 6 forms an annular space 611 on the outer peripheral side of the mixing cylinder 5. An inlet portion 63 of the second fuel F2 is connected in the vicinity of the base end portion of the passing cylinder portion 61. The inlet portion 63 of the second fuel F2 can be provided at one or a plurality of locations in the circumferential direction C on the outer peripheral portion of the passing cylinder portion 61. The pipe 631 constituting the inlet portion 63 of the second fuel F2 is arranged along the circumferential direction C of the passing cylinder portion 61.

The fuel cylinder 6 is configured to form a swirling flow of the second fuel F2 by the second fuel F2 flowing into the passing cylinder portion 61 along the circumferential direction C of the passing cylinder portion 61. The heating cylinder portion 62 of the fuel cylinder 6 is formed as a portion located on the tip side L1 in the axial direction L with respect to the tip ejection portion 51 of the mixing cylinder 5. In the heating cylinder portion 62, the second fuel F2 that has passed through the passing cylinder portion 61 is heated by the first flame H1 formed from the tip ejection portion 51 of the mixing cylinder 5.

As shown in FIGS. 8 and 10, in the second-stage combustion unit 12 of the present embodiment, the air cylinder 7 through which the second combustion air A2 passes and is ejected on the outer peripheral side of the fuel cylinder 6 (heating cylinder unit 62). Has. The empty cylinder 7 is formed as an annular cylinder arranged on the outer peripheral side of the fuel cylinder 6. A plurality of ejection holes 71 for ejecting the second combustion air A2 supplied into the air cylinder 7 into the fuel cylinder 6 are formed on the inner peripheral side of the empty cylinder 7 and the outer peripheral portion of the fuel cylinder 6. ing. The ejection holes 71 are formed to eject the second combustion air A2 at a plurality of locations in the circumferential direction C of the fuel cylinder 6.

In the air cylinder 7 of this embodiment, a plurality of fins 73 that guide the ejection direction of the second combustion air A2 are arranged. The fin 73 is configured such that the second combustion air A2 flows from the outer peripheral side to the inner peripheral side and is inclined toward the tip side L1 in the axial direction L. A plurality of fins 73 are arranged in the air cylinder 7 in a state of being lined up in the axial direction L and the circumferential direction C. Then, the second combustion air A2 is inclined and ejected from the air cylinder 7 toward the tip end side in the fuel cylinder 6.

As shown in FIG. 9, the pipe 541 connected to the mixing cylinder 5 and constituting the inlet portion 54 of the air-fuel mixture G is connected to the mixer 55 for mixing the first fuel F1 and the first combustion air A1. It is connected. A pipe 56 to which the first fuel F1 is supplied and a pipe 57 to which the first combustion air A1 is supplied are connected to the mixer 55. Then, the first fuel F1 and the first combustion air A1 are mixed in the mixer 55, and the air-fuel mixture G is supplied from the mixer 55 into the mixing cylinder 5 via the pipe 541.

In this embodiment, the formation state of the first flame H1 and the second flame H2 is adjusted by appropriately adjusting the mixing ratio (air-fuel ratio) of the first fuel F1 and the first combustion air A1 in the mixing cylinder 5. The amount of carbon-derived components such as soot produced in the second fuel F2 can be adjusted.

As shown in FIG. 8, when the air-fuel mixture G flows into the mixing cylinder 5 from the inlet portion 54 of the air-fuel mixture G, a swirling flow of the air-fuel mixture G that rises while swirling around the stabilizer 53 in the mixing cylinder 5 flows. It is formed. Then, when the air-fuel mixture G is ejected from the tip ejection portion 51 of the mixing cylinder 5, it burns to form the first flame H1. Further, at a position below (base end side) of the first flame H1, a crescent-shaped third flame H3 is formed around the range where the air-fuel mixture G burns.

Then, when the second fuel F2 flows into the fuel cylinder 6 from the inlet portion 63 of the second fuel F2, a swirling flow of the second fuel F2 that rises while swirling around the mixing cylinder 5 in the fuel cylinder 6 is formed. Will be done. The second fuel F2 passing through the heating cylinder portion 62 burns with the second combustion air A2 ejected from the air cylinder 7 into the heating cylinder portion 62. Then, the second flame H2 is formed so as to overlap the first flame H1 by the combustion of the second fuel F2 and the second combustion air A2. The second fuel F2 passing through the fuel cylinder 6 is heated by the first flame H1 and the second flame H2 in the heating cylinder portion 62.

In this embodiment, the first flame H1 is formed by performing the first stage combustion using the air-fuel mixture G, and the first flame H1 and the second flame H2 are used to surround the first flame H1 and the second flame H2. The second fuel F2 passing through is heated. By using the air-fuel mixture G, the formation states of the first flame H1 and the second flame H2 can be easily adjusted.

Further, as shown in FIG. 11, instead of allowing the air-fuel mixture G of the first fuel F1 and the first combustion air A1 to flow into the mixing cylinder 5 from the inlet portion 54, the first fuel is supplied from the separate inlet portions 54. F1 and the first combustion air A1 can also flow in. In this case, in the mixing cylinder 5, when the first fuel F1 and the first combustion air A1 turn, they are mixed to form an air-fuel mixture G, and this air-fuel mixture G is discharged from the tip ejection portion 51 of the mixing cylinder 5. It is ejected to form the first flame H1 and the second flame H2.

Further, as shown in FIG. 12, instead of the stabilizer 53, a stabilizer (cooling air cylinder) 58 with a cooling function for passing combustion air for cooling may be arranged at the center of the mixing cylinder 5. The stabilizer 58 with a cooling function reduces fluctuations in the flow of the air-fuel mixture G in the mixing cylinder 5 at the center of the swirling flow, stably holds the first flame H1 and the second flame H2, and cools itself. Is made possible. In this case, when the first fuel F1, the second fuel F2, the first combustion air A1 and the second combustion air A2 are ejected from the burner 1, the third combustion is performed from the tip of the stabilizer 58 with a cooling function. Blow out air A3. The third combustion air A3 can be fresh air as the atmosphere. When the stabilizer 58 with a cooling function is used, the mixing cylinder 5 and the stabilizer 58 with a cooling function are appropriately cooled by the third combustion air A3 passing through the stabilizer 58 with a cooling function, and the mixing cylinder 5 and the stabilizer 58 with a cooling function are provided. Deterioration of the stabilizer 58, high temperature corrosion and the like can be alleviated.

Further, the configuration of the ejection hole 71 and the inlet portion 72 of the second combustion air A2 in the air cylinder 7 is such that the ejection hole 41 of the second air cylinder 4 and the inlet portion of the second combustion air A2 shown in the first embodiment are configured. It is also possible to make the same configuration as 42. Further, instead of the fin 73, the swivel blade 43 shown in the first embodiment may be used.

Also in this embodiment, in order to appropriately generate carbon-derived components and unburned components in the second fuel F2, the supply amount (flow rate) of the second fuel F2 to the burner 1 is the first fuel F1 to the burner 1. It can be larger than the supply amount (flow rate) of. The supply amount (flow rate) of the second combustion air A2 to the burner 1 can be larger than the supply amount (flow rate) of the first combustion air A1 to the burner 1.

Other configurations, actions and effects, etc. of the burner 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

<Embodiment 3>
This embodiment also shows a case where the configuration of the first-stage combustion unit 11 is different from the configuration shown in the first embodiment.
As shown in FIGS. 13 and 14, the first-stage combustion unit 11 of the present embodiment has a mixing cylinder 5X and a fuel cylinder 6X. The arrangement relationship between the mixing cylinder 5X and the fuel cylinder 6X of the present embodiment is opposite to the arrangement relationship between the mixing cylinder 5 and the fuel cylinder 6 shown in the second embodiment. In the mixing cylinder 5X of the present embodiment, the air-fuel mixture G in which the first fuel F1 and the first combustion air A1 are mixed passes in the axial direction L and is ejected to the inner peripheral side, and the air-fuel mixture G causes the first flame H1. Is configured to form. The fuel cylinder 6X of the present embodiment extends from the passing cylinder portion 61X through which the second fuel F2 passes on the inner peripheral side of the mixing cylinder 5X to the tip side L1 in the axial direction L of the passing cylinder portion 61X. It is formed and has a heating cylinder portion 62X for heating the second fuel F2 by the first flame H1.

A plurality of ejection holes (slits) 51X extending in the axial direction L of the fuel cylinder 6X for ejecting the air-fuel mixture G are formed at a plurality of locations on the inner peripheral side of the mixing cylinder 5X in the circumferential direction C of the fuel cylinder 6X. Has been done. The air-fuel mixture G in the mixing cylinder 5X is ejected from the plurality of ejection holes 51X into the fuel cylinder 6X located on the inner peripheral side of the mixing cylinder 5X. Then, the air-fuel mixture G ejected from the plurality of ejection holes 51X into the fuel cylinder 6X is burned to form the first flame H1.

As shown in FIG. 15, an annular space 511 through which the swirling flow of the air-fuel mixture G passes is formed between the inner peripheral surface of the mixing cylinder 5X and the outer peripheral surface of the fuel cylinder 6X. The mixing cylinder 5X is provided with an inlet portion 54 of the air-fuel mixture G. Further, the pipe 541 constituting the inlet portion 54 of the air-fuel mixture G is connected to the mixer 55 in which the first fuel F1 and the first combustion air A1 are mixed. The configuration of the inlet portion 54 of the air-fuel mixture G and the mixer 55 can be the same as that of the first embodiment. Then, a swirling flow of the air-fuel mixture G is formed in the mixing cylinder 5X.

In the mixing cylinder 5X, swivel blades for forming a swirling flow of the air-fuel mixture G ejected into the fuel cylinder 6X can be arranged at a plurality of locations C in the circumferential direction of the mixing cylinder 5X. In this case, the first flame H1 can be formed by the swirling flow of the air-fuel mixture G.

As shown in FIG. 14, a pipe 63X to which the second fuel F2 is supplied is connected to the base end portion of the fuel cylinder 6X. The second fuel F2 is ejected from the pipe 63X and rises in the fuel cylinder 6X. The second fuel F2 passes through the inner peripheral side of the air-fuel mixture G ejected from the mixed cylinder 5X on the inner peripheral side of the mixed cylinder 5X.

As shown in FIG. 16, the second-stage combustion unit 12 of the present embodiment has an air cylinder 7 through which the second combustion air A2 passes and is ejected on the outer peripheral side of the fuel cylinder 6X (heating cylinder portion 62X). The empty cylinder 7 is formed with an ejection hole 71 for the second combustion air A2 and an inlet portion 72 for the second combustion air A2. The configuration of the empty cylinder 7 can be the same as the configuration of the air cylinder 7 shown in the second embodiment. Further, the configuration of the air cylinder 7 may be the same as the configuration of the second air cylinder 4 shown in the first embodiment.

As shown in FIG. 14, when the air-fuel mixture G flows into the mixed air-fuel mixture G from the inlet portion 54 of the air-fuel mixture G, the air-fuel mixture G rises while swirling around the fuel cylinder 6X in the mixed cylinder 5X. A swirling flow is formed. Then, when the air-fuel mixture G is ejected from the ejection hole 51X of the mixing cylinder 5X to the inner peripheral side, it burns to form the first flame H1. Further, the second fuel F2 flowing into the fuel cylinder 6X from the pipe 63X of the second fuel F2 rises in the fuel cylinder 6X. Then, the second fuel F2 passing through the fuel cylinder 6X (heating cylinder portion 62X) is heated by the first flame H1.

The second fuel F2 passing through the fuel cylinder 6X is heated by the first flame H1 and burns with the second combustion air A2 ejected from the air cylinder 7 into the fuel cylinder 6X. Then, the second flame H2 is formed so as to overlap the first flame H1 by the combustion of the second fuel F2 and the second combustion air A2.

Also in this embodiment, the ratio of the supply amount (flow rate) of the first fuel F1 to the burner 1 and the supply amount (flow rate) of the second fuel F2 can be the same as in the second embodiment. Further, the ratio of the supply amount (flow rate) of the first combustion air A1 to the burner 1 and the supply amount (flow rate) of the second combustion air A2 can be the same as in the second embodiment.

The other configurations, actions, effects, and the like of the burner 1 of the present embodiment are the same as those of the first and second embodiments. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first and second embodiments are the same as those in the first and second embodiments.

The present invention is not limited to each embodiment, and further different embodiments can be configured without departing from the gist thereof. In addition, the present invention includes various modifications, modifications within a uniform range, and the like.

1 Burner 11 1st stage combustion part 12 2nd stage combustion part 21 1st fuel cylinder 22 2nd fuel cylinder 3 1st air cylinder 31 Injection cylinder part 312 Outer circumference ejection part 313 Inner circumference ejection part 32 Heating cylinder part 4 2nd air Cylinder 5,5X Mixing cylinder 51 Tip ejection part 6,6X Fuel cylinder 61,61X Passing cylinder part 62,62X Heating cylinder part 7 Empty cylinder F1 First fuel F2 Second fuel A1 First combustion air A2 Second combustion air H1 1st flame H2 2nd flame L Axial direction C Circumferential direction

Claims (9)

The first fuel and the first combustion air burn to form a first flame, and the first flame heats a second fuel separately supplied from the first fuel into the second fuel. The first-stage combustion part that produces carbon-derived components and unburned components,
The second fuel, which is ignited by the first flame and contains the carbon-derived component and the unburned component, and the second combustion air supplied separately from the first combustion air completely burn and the second flame. It is equipped with a second stage combustion part, which forms a
The first stage combustion part is
The first fuel cylinder through which the first fuel passes and is ejected,
A second fuel cylinder through which the second fuel passes and is ejected on the inner peripheral side of the first fuel cylinder, and
On the outer peripheral side of the first fuel cylinder, the ejection cylinder portion through which the first combustion air passes and is ejected, and the ejection cylinder portion is formed so as to extend from the ejection cylinder portion to the tip end side in the axial direction of the ejection cylinder portion. It has a first air cylinder having a heating cylinder portion for heating the second fuel by the first flame, and has.
The second stage combustion part is
A burner having a second air cylinder on which the second combustion air passes and is ejected on the outer peripheral side of the first air cylinder . The ejection tube portion is
The first combustion air flowing into the ejection cylinder portion along the circumferential direction of the ejection cylinder portion is configured to form a swirling flow of the first combustion air.
Further, an outer peripheral ejection portion formed on the outer peripheral portion in the ejection cylinder portion and ejecting a part of the swirling flow of the first combustion air, and an outer peripheral ejection portion.
It is formed at a plurality of locations in the circumferential direction at a position on the inner peripheral side of the outer peripheral ejection portion and on the outer peripheral side of the first fuel cylinder, and ejects the remaining portion of the swirling flow of the first combustion air. The burner according to claim 1 , further comprising an inner peripheral ejection portion. The burner according to claim 2 , wherein the inner peripheral ejection portion is formed so as to project from a position where the outer peripheral ejection portion is formed toward the tip end side in the axial direction of the first air cylinder. The first fuel and the first combustion air burn to form a first flame, and the first flame heats a second fuel separately supplied from the first fuel into the second fuel. The first-stage combustion part that produces carbon-derived components and unburned components,
The second fuel, which is ignited by the first flame and contains the carbon-derived component and the unburned component, and the second combustion air supplied separately from the first combustion air completely burn and the second flame. It is equipped with a second stage combustion part, which forms a
The first stage combustion part is
A mixing cylinder in which an air-fuel mixture in which the first fuel and the first combustion air are mixed passes and is ejected, and the air-fuel mixture forms the first flame.
On the outer peripheral side of the mixing cylinder, the passing cylinder portion through which the second fuel passes and the passing cylinder portion extending from the passing cylinder portion to the tip end side in the axial direction are formed, and the second fuel is formed by the first flame. With a fuel cylinder, which has a heating cylinder for heating,
The second stage combustion part is
It has an air cylinder on the outer peripheral side of the fuel cylinder through which the second combustion air passes and is ejected.
A burner in which a stabilizer with a cooling function for passing combustion air for cooling is arranged in the center of the mixing cylinder . The mixed cylinder is
The mixture is configured to form a swirling flow of the mixture by the mixture flowing into the mixture cylinder along the circumferential direction of the mixture cylinder.
The burner according to claim 4 , further comprising a tip ejection portion for ejecting a swirling flow of the air-fuel mixture. The fuel cylinder
The fourth or fifth aspect of the present invention, wherein the second fuel flowing into the passing cylinder portion along the circumferential direction of the passing cylinder portion of the fuel cylinder is configured to form a swirling flow of the second fuel. Burna. The first fuel and the first combustion air burn to form a first flame, and the first flame heats a second fuel separately supplied from the first fuel into the second fuel. The first-stage combustion part that produces carbon-derived components and unburned components,
The second fuel, which is ignited by the first flame and contains the carbon-derived component and the unburned component, and the second combustion air supplied separately from the first combustion air completely burn and the second flame. It is equipped with a second stage combustion part, which forms a
The first stage combustion part is
An air-fuel mixture in which the first fuel and the first combustion air are mixed passes through and is ejected to the inner peripheral side, and the air-fuel mixture forms a first flame by the air-fuel mixture.
On the inner peripheral side of the mixing cylinder, the passing cylinder portion through which the second fuel passes and the passing cylinder portion extending from the passing cylinder portion to the tip end side in the axial direction are formed, and the second flame is formed. With a fuel cylinder having a heating cylinder portion for heating the fuel,
The second stage combustion part is
A burner having an air cylinder on the outer peripheral side of the fuel cylinder through which the second combustion air passes and is ejected . The burner according to claim 7 , wherein a plurality of ejection holes extending in the axial direction of the fuel cylinder are formed at a plurality of locations in the circumferential direction of the fuel cylinder to eject the air-fuel mixture. 7 . The burner described in.

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