JP2006162095A - Burner and fuel combustion equipment having this burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner and fuel combustion equipment having this burner, superior in an environmental aptitude, without the problem in cost, by performing luminous flame combustion without adding a luminance improving agent, by using oxygen-including fuel such as dimethyl ether (DME). <P>SOLUTION: This burner 10 forms fuel flow passages 341A and 341B and air flow passages 346A and 346B, and has a burner tip 340 on the tip for atomizing the fuel such as the DME by pressure of an atomizing medium from a delivery hole 349 communicating with both passages. In the burner 10 and the fuel combustion equipment having this burner 10, a cylindrical member 400 communicated in air with the delivery hole 349 and having a substantially truncated cone-shaped cavity part 415 extending in the direction for atomizing the fuel, is arranged on the delivery hole 349 side of the burner tip 340. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a burner and a fuel combustion apparatus including the burner.

  At present, most boilers and furnaces are operated using heavy oil as fuel, but due to stricter environmental regulations, etc., the exhaust gas has become cleaner, and conversion to gas-fired boilers with less adverse effects on the environment is being promoted. In addition, DME (Dimethyl Ether) fuel, which is synthesized from natural gas, is a clean fuel suitable for the environment. In recent years, a large amount of fuel is planned to be marketed. Regarding reactor fuel, conversion from heavy oil to DME is expected.

  In general, in order to burn fuel such as heavy oil, a liquid fuel such as heavy oil is mixed with a spray medium such as steam or air using a premixed or diffusion type fuel injection burner. Liquid fuel is sprayed in the form of a mist by pressure, and it is ignited and combusted. On the other hand, when oxygen-containing fuel such as DME is burned with a normal premixed type or diffusion type fuel injection burner, it is orange like heavy oil even if the operation is performed with the amount of combustion air being extremely reduced. A bright flame is not emitted but a blue non-flame is exhibited, and the amount of radiant heat transfer in the furnace of the boiler or the heating furnace is lowered, so that the ability of the boiler or the like is lowered. As a result, depending on the boiler / heating furnace, the load has to be reduced to about 60%, and there is a problem that conversion to DME becomes impossible when there is not enough capacity.

  On the other hand, as a means for brightly burning an oxygen-containing fuel such as DME, there is provided a technique of adding a brightness enhancer, in which an iron-based inorganic compound or a surfactant is added to a base of a petroleum-based solvent, to the fuel ( For example, Patent Document 1 and Patent Document 2). By adding such an additive to the fuel, an orange bright flame can be emitted even with a conventional premixed type or diffusion type boiler, etc., and the capacity of the boiler is similar to that of conventional heavy oil. We were able to maintain the state.

Japanese Patent Publication No.58-24478 Japanese Patent Publication No. 60-45687

  However, in the case where a brightness enhancer is added to DME in order to burn the luminous flame as described above, there is a concern about the influence of iron contained in the additive on the fuel facility and exhaust gas, which is preferable. It was not a means. In addition, the brightness improving agent is generally expensive and has a problem in terms of cost including an influence on facilities.

  Accordingly, an object of the present invention is to use an oxygen-containing fuel such as DME and perform bright flame combustion without adding a brightness enhancer, so that environmental suitability is also good and there is a problem in terms of cost. It is an object of the present invention to provide a burner having no burner and a fuel combustion apparatus including the burner.

  In order to achieve the above-described object, the burner of the present invention has a fuel flow channel and a spray medium flow channel, and a burner tip that sprays fuel by the pressure of the spray medium from a discharge hole communicating with both the channels. In the burner tip, on the discharge hole side of the burner tip, there is disposed a cylindrical member that is in air communication with the discharge hole and has a substantially truncated cone-shaped cavity that extends in the direction in which the fuel is sprayed. It is provided.

The burner according to the present invention has a cylindrical member that is in air communication with the discharge hole side of the burner tip and has a substantially frustoconical cavity that extends in the direction in which the fuel is sprayed. It is arranged. For this reason, the fuel discharged from the discharge hole is sprayed and burned by adjusting the diffusion state through a substantially frustoconical cavity and forming a pseudo incomplete combustion state. Even when an oxygen-containing fuel such as DME is used, bright flame combustion can be performed, and the amount of radiant heat transfer can be improved.

  In addition, according to the configuration of the present invention, by a simple means of installing a cylindrical member at the tip of the burner tip, it is possible to perform bright flame combustion with an oxygen-containing fuel such as DME without using an expensive brightness enhancer. This can be realized at low cost. Furthermore, there is no influence on the combustion equipment and exhaust gas.

  And according to the burner of this invention, even if it is a case where clean oxygen-containing fuels, such as DME, are used, bright flame combustion can be implemented, Therefore The load is reduced using the existing boiler and a heating furnace. Therefore, it is possible to achieve clean combustion with facilities such as a boiler and a heating furnace that generate less air pollutants such as nitrogen oxides, sulfur oxides, and soot that have been generated in large quantities due to heavy oil combustion.

In the burner according to the present invention, an angle formed by an axis of the hollow portion having the substantially truncated cone shape formed in the cylindrical member and an inclined portion of the hollow portion is 15 ° to 30 °, and the hollow portion The ratio of the diameter d ₁ of the opening on the tip side of the burner tip to the distance L between the opening on the tip side and the opening on the opposite side is d ₁ / L = 1/2 to 1/6. Is preferred.
According to the present invention, the angle formed by the axis of the hollow portion formed in the cylindrical member and the inclined portion is in a specific range of 15 ° to 30 °, and the opening of the burner tip tip side in the hollow portion is formed. Since the ratio between the diameter d ₁ and the distance L between the opening on the tip side and the opening on the opposite side is a specific range of d ₁ / L = 1/2 to 1/6, the above-described effect can be further improved. Even when an oxygen-containing fuel such as DME is used as the fuel, the bright flame combustion can be carried out reliably, and the amount of radiant heat transfer can be further improved.

  The fuel combustion apparatus of the present invention includes a fuel storage means for storing a liquid fuel, a spray medium storage means for storing a spray medium, a fuel flow path and a spray medium flow path, and is supplied from the fuel storage means. A fuel combustion apparatus having a burner equipped with a burner tip at the tip thereof for spraying the liquid fuel and the spray medium supplied from the spray medium storage means from the discharge holes communicating with both passages by the pressure of the spray medium The burner is the burner of the present invention described above.

Since the fuel combustion apparatus of the present invention is a fuel combustion apparatus provided with the above-described burner of the present invention, the fuel combustion apparatus can exhibit the above-described effects.
That is, the diffusion state of the liquid fuel supplied from the fuel storage means is adjusted together with the spray medium supplied from the spray medium storage means from the discharge hole of the burner tip through the substantially frustoconical cavity, and is simulated. The incomplete combustion state is formed and sprayed and burned. Therefore, even when an oxygen-containing fuel such as DME is used as the fuel, bright flame combustion can be performed, and the amount of radiant heat transfer is reduced. A fuel combustion apparatus that can be improved can be suitably provided.
In addition, the fuel combustion apparatus of this invention of such a structure can be applied to a boiler or a heating furnace.

  And the fuel combustion apparatus of this invention can exhibit the effect to the maximum by making the said liquid fuel into dimethyl ether (DME).

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
(I) Configuration of the fuel combustion device:
FIG. 1 is a schematic view showing a fuel combustion apparatus 1 of the present embodiment.
This fuel combustion apparatus 1 is connected to a DME storage tank 2 that is a fuel storage means that pressurizes liquid fuel DME (dimethyl ether) and stores it in a liquid state, and is connected to the DME storage tank 2 and passes through the liquid DME. And a pressurizing pump 4 that is connected to the other end of the DME supply pipe 3 and pressurizes the DME. On the other hand, the air as the spray medium is stored in an air storage tank 7 as a spray medium storage means. The pressure pump 4 connected to the DME storage tank 2 and the burner 10 connected to each of the air storage tank 7 and sprayed with DME for combustion are provided as a basic configuration.

The pressurizing pump 4 and the burner 10 are connected by a connecting pipe 6 including a first connecting pipe 61 and a second connecting pipe 62, and a flow rate adjustment is provided between the first connecting pipe 61 and the second connecting pipe 62. A valve 5 is provided so that the flow rate of DME can be easily adjusted. The air storage tank 7 and the burner are connected via an air supply pipe 8.
Then, DME is introduced from the DME introduction section 102 disposed in the burner 10, and air as a spray medium is introduced from the air introduction section 103 disposed in the burner 10.

(II) Configuration of burner 10:
2 is a schematic view of the burner 10 disposed in the fuel combustion apparatus 1 shown in FIG. 1, and FIG. 3 is a cross-sectional view showing the internal structure of the burner 10. As shown in FIG. In FIG. 3, a part of the internal structure of the spray combustion unit 300 is omitted.
In addition, the arrow direction described in FIG.2 and FIG.3 and FIGS. 4-8 shows the direction (and upward direction of a figure) in which a fuel is injected.

  The burner 10 of this embodiment shown in FIGS. 2 and 3 includes a burner body 100 and a handle portion 200 attached to the rear end side of the burner body 100 (the direction opposite to the arrow direction in FIGS. 2 and 3). The spray combustion unit 300 attached to the tip end side of the burner body 100 (in the direction of the arrow in FIGS. 2 and 3) is provided as a basic configuration.

The burner body 100 includes a gun body 101, a DME introduction portion 102 drilled in a front side surface (right side in FIGS. 2 and 3) of the gun body 101, and a rear end side surface of the gun body 101. And an air introduction portion 103 in contact therewith.
As described above, the DME introduction unit 102 is supplied with DME from the DME storage tank 2, and the air introduction unit 103 is supplied with air as the spray medium from the air storage tank 7.

Further, a substantially cylindrical sleeve 108 is provided inside the gun body 101 constituting the burner body 100 so as to be positioned between the DME introduction portion 102 and the air introduction portion 103. The sleeve 108 has a configuration in which a side surface on the front end side is in contact with the inner wall of the gun body 101 and a tapered portion 108A in which the outer diameter of the substantially cylindrical shape is reduced toward the rear end side.
The sleeve 108 has a constant inner diameter, and a DME passage hole 108B is formed along the central axis of the sleeve 108.

  A packing 109 is disposed between the outer wall of the tapered portion 108 </ b> A and the inner wall of the gun body 101. The packing 109 is biased forward through a packing retainer 110 screwed into the outer wall of the sleeve 108, and seals the gap between the outer wall of the sleeve 108 and the inner wall of the gun body 101.

On the other hand, the handle portion 200 includes a plug 202 screwed to the gun body 101 via the packing 201, a substantially cylindrical handle pin 203 fitted to the plug 202, and a rear end portion 203A of the handle pin 203 at one end. The other end is made of a linear metal attached to the plug 202 and includes a handle 204 formed in a spiral shape around the handle pin 203.
The burner 10 of the present embodiment can adjust the position and direction of the burner 10 by gripping and operating the handle 204 by hand.

  The spray combustion unit 300 includes a long cylindrical outer nozzle 310 connected and fixed to the inner wall of the gun body 101 via a holding unit 311, and a DME passage unit 320 </ b> A formed therein, and a sleeve An inner nozzle 320 having a long cylindrical shape coaxial with the outer nozzle 310 and connected to the DME passage hole 108B of the 108, and a substantially cylindrical nozzle body whose outer surface end is connected and fixed to the inner surface of the outer nozzle 310 tip. 330 and the cover portion 350 are connected and fixed to the nozzle body 330 to form fuel flow paths 341A and 341B (see FIG. 4) and air medium flow paths 346A and 346B (see FIG. 4) which are spray medium flow paths. . Also, a burner tip 340 for spraying DME by the pressure of air as a spraying medium from a discharge hole 349 (see FIG. 4) communicating with these, and a burner tip 340 are disposed at the tip of the burner tip 340 and discharged from the burner tip 340. A cylindrical member 400 having a substantially frustoconical hollow portion 415 that is in air communication with the hole 349 and spreads in a direction in which DME as fuel is sprayed is provided as a basic configuration.

  As shown in FIG. 3, the inner nozzle 320 is formed by connecting a first inner nozzle 3201 connected to the sleeve 108 and a second inner nozzle 3202 connected to the burner tip. The DME passage portion 320A is formed by the first cylindrical hole 3201A formed in the inner nozzle 3201 and the second cylindrical hole 3202A formed in the second inner nozzle 3202 and having a pore smaller than the first cylindrical hole 3201A. Has been.

  With such a configuration, the DME introduced from the DME introduction unit 102 passes through the DME passage hole 108B formed inside the sleeve 108, and the first cylindrical hole 3201A inside the first inner nozzle 3201 and the second cylinder hole 3201A. After passing through the DME passage part 320 </ b> A composed of the second cylindrical hole 3202 </ b> A inside the inner nozzle 3202, it is supplied to the burner tip 340.

In addition, a gap 360 </ b> A having a donut-shaped cross section for allowing the air that is the spray medium introduced from the air introduction portion 103 of the burner body 110 to pass therethrough is formed between the inner wall of the outer nozzle 310 and the outer wall of the inner nozzle 320. A continuous gap 360A is formed between the inner wall of the nozzle body 330 and the outer wall of the inner nozzle 320, and a gap 360B having a smaller diameter than the gap 360A is formed. The two gaps 360A 360B constitutes the air passage portion 360.
With such a configuration, the air introduced from the air introduction unit 103 passes through the air passage unit 360 including the gaps 360 </ b> A and 360 </ b> B and is supplied to the burner tip 340.

(III) Configuration of burner tip 340:
FIG. 4 is a cross-sectional view showing the configuration of the burner tip 340 disposed at the tip of the burner 10. In FIG. 4, the tubular member 400 is shown in a removed state.
Inside the burner tip 340, there are formed two fuel flow paths 341A and 341B (the fuel flow path 341B is indicated by a broken line) respectively connected to the DME passage part 320A formed inside the spray combustion part 300 of the burner 10. Has been. Two fuel flow paths 341A and 341B formed inside the burner tip 340 allow fuel supplied from the fuel passage section 320A of the spray combustion section 300 to pass through fuel supply holes 342 having a smaller diameter than the fuel flow paths 341A and 341B. Through the H.343, the mixing chamber 345 merges with the air as the spray medium.

Specifically, the fuel supply holes 342 and 343 include first fuel supply units 3421 and 3431 and second fuel supply units 3422 and 3432 having pores smaller than those of the first fuel supply units 3421 and 3431, and the fuel flow path 341A. , 341B and the first fuel supply parts 3421, 3431 are connected via connecting parts 344A, 344B. The DME that has passed through the fuel flow paths 341A and 341B passes through the fuel supply holes 342 and 343 that become narrower in stages, such as the first fuel supply parts 3421 and 3431 and the second fuel supply parts 3422 and 3432, It is discharged into the mixing chamber 345.
Note that the fuel supply holes 342 and 343 are arranged in an oblique direction with respect to the mixing chamber 345 and adopt a configuration in which DME as fuel is supplied to the mixing chamber 345.

On the other hand, in the burner tip 340, there are two air flow paths 346A and 346B (the air flow path 346A is indicated by a broken line) which is formed inside the burner body 110 and is connected to an air passage 360 having a substantially donut-shaped cross section. Is formed). The air introduced from the air passage part 360 passes through the two air flow paths 346A and 346B, and once joins at the air joining part 347, and then passes through the air supply holes 348 of the pores from the air joining part 347. Then, the liquid is discharged toward the mixing chamber 345.
The DME, which is liquid fuel mixed in the mixing chamber 345, and the air, which is the spray medium, spray fuel from the discharge holes 349 communicating with the mixing chamber 345 by the pressure of the spray medium.

  Note that the burner tip 340 and the nozzle body 330 constituting the burner body 110 are integrated by a cover portion 350. That is, in the present embodiment, the burner chip 340 having the above-described configuration is bonded and fixed inside the front end side (in the direction of the arrow in FIG. 4) of the cover portion 350, and on the opposite side to the front end side of the cover portion 350. The screw thread 3501 formed on the inner surface and the screw thread 3301 formed on the outer surface of the tip of the nozzle body 330 constituting the burner main body 110 are engaged with each other, whereby the burner tip 340 and the burner main body 110 (nozzle body 330) are integrated. Will be converted.

(IV) Configuration of the cylindrical member 400:
A cylindrical member 400 is disposed in the burner 10 provided with the burner tip 340 at the tip shown in FIGS. Here, FIG. 5 is a cross-sectional view showing the internal configuration of the cylindrical member 400, and FIG. 6 is a cross-sectional view showing a state in which the cylindrical member 400 is disposed on the burner tip 340.
In the present embodiment, the cylindrical member 400 disposed on the front end side of the burner tip 340 includes a first cylindrical portion 410 and a second cylindrical shape located outside the first cylindrical portion 410. The aspect comprised from the part 420 is shown.

  The first cylindrical portion 410 constituting the cylindrical member 400 is formed to be connected to the concave portion 411 that covers the tip of the burner tip and the concave portion 411 toward the tip of the burner tip, and sprays fuel. It has a substantially frustoconical cavity 415 extending in the direction (arrow direction in FIG. 6). In the burner 10 of the present invention, the cylindrical member 400 having the substantially frustoconical hollow portion 415 is disposed with respect to the tip of the burner tip 340, so that the discharge is performed in a sprayed state from the discharge hole 349 of the burner tip 340. The fuel to be dispersed is moderately diffused through the substantially frustoconical cavity 415, and is efficiently sprayed and burned. Therefore, even if an oxygen-containing fuel such as DME is used as the fuel, Combustion can be performed.

As shown in FIG. 5, in the substantially truncated cone-shaped cavity 415, the axis l of the cavity 415 is provided.
The angle θ (half the frusto-conical apex angle) formed by (the dashed line in FIG. 5) and the inclined portion 4151 of the hollow portion 415 is preferably 15 ° to 30 °, and preferably 20 ° to 25 °. It is particularly preferred.
Further, the hollow portion 415, the distal end side of the burner tip 340 and the diameter _{d 1} of the first opening 4152 of (in the direction of the arrow in FIG. 5), the diameter of the second opening 4153 opposite to the said front end side _d 2 ( With respect to d ₁ <d2) and the distance L between the first opening 4152 and the second opening 4153, the relationship between the diameter d ₁ of the first opening 4152 and the distance L is d ₁ / L = 1 / 2˜ 1/6 is preferable, and 1/3 to 1/4 is particularly preferable.
Thus, the angle θ formed by the axis l of the hollow portion 415 and the inclined portion 4151 is in the range of 15 ° to 30 °, and the relationship between the diameter d ₁ of the first opening 4152 and the distance L is d ₁ / If L = 1/2 to 1/6, the fuel discharged from the discharge hole 349 is diffused more efficiently through the cavity 415.
The relationship between the diameter d ₂ of the second opening 4153 and the distance L is not particularly limited, but d ₂ / L =
It may be about 0.6 to 1.7.

On the other hand, the second tubular portion 420 constituting the tubular member 400 is to hold the first tubular portion 410 fixed from the outside, and the outer surface of the first tubular portion 410 and the second tubular portion 420. The inner surface is fitted and fixed.
Further, a screw thread 4201 is formed on the inner surface of the second tubular part 420 on the burner tip 340 side, and this screw thread 4201 and the outer periphery of the cover part 350 are formed as shown in FIG. The cylindrical member 400 is fixed to the tip of the burner 10 by meshing with the thread 3502 that has been made.

  The first cylindrical portion 410 and the second cylindrical portion 420 can be made of, for example, a stainless material such as SUS304, and can be manufactured by using a known processing method. .

(V) DME combustion method using the fuel combustion apparatus 1:
Next, an example of a DME combustion method for burning DME, which is a liquid fuel, using the fuel combustion apparatus 1 of the present embodiment will be described with reference to FIGS.

First, as shown in FIG. 1, in the fuel combustion apparatus 1, DME that is liquid fuel is sent from the DME storage tank 2 to the pressurization pump 4 via the DME supply pipe 3, and the pressurization pump 4. The more pressurized DME passes through the first connecting pipe 61 and enters the DME introduction section 102 disposed in the burner 10 via the second connecting pipe 62 in a state where the required flow rate is adjusted by the flow rate control valve 5. be introduced.
On the other hand, the air that is the spray medium is introduced from the air storage tank 7 that stores the air into the air introduction unit 103 disposed in the burner 10 via the air supply pipe 8.

  As shown in FIGS. 2 and 3, in the burner 10, the DME introduced from the DME introduction unit 102 flows into the gun body 101. Thereafter, the DME sequentially passes through the passage hole 108B of the sleeve 108 and the fuel passage portion 320A of the inner nozzle 320 and flows into the fuel flow paths 341A and 341B formed in the burner tip 340.

  On the other hand, the air as the spray medium flows into the gun body 101 through the air introduction unit 103, and then passes through the air passage unit 360 formed by the gap 360 </ b> A and the gap 360 </ b> B to form an air flow formed in the burner tip 340. It flows into path 346A, 346B.

  As shown in FIGS. 4 to 6, in the burner chip 340, the DME that flows in from the fuel passage part 320 </ b> A passes through the two fuel flow paths 341 </ b> A and 341 </ b> B, and then the first fuel supply parts 3421 and 3431. The first fuel supply units 3421 and 3431 pass through the fuel supply holes 342 and 343 including the second fuel supply units 3422 and 3432 having small pores, and are discharged into the mixing chamber 345. In addition, the air flowing in from the air passage part 360 passes through the two air flow paths 346A and 346B, and once joins in the air joining part 347, then the air supply hole 348 having a pore from the air joining part 347. Then, the liquid is discharged toward the mixing chamber 345 in the same manner as DME.

  The DME and air mixed in the mixing chamber 345 are discharged in a state where the DME is sprayed by the pressure of the spray medium from the discharge hole 349 communicating with the mixing chamber 345, but on the discharge hole 349 side of the burner tip 340. Since the cylindrical member 400 having the substantially truncated cone-shaped cavity 415 that is in air communication with the discharge hole 349 and spreads in the fuel spray direction is disposed, the spray is discharged from the discharge hole 349 of the burner tip 340. The DME discharged in a state is adjusted in its diffusion state through the substantially truncated cone-shaped cavity 415, and is sprayed and burned in a pseudo incomplete combustion state. Thus, the orange bright flame combustion is suitably performed, and the amount of radiant heat transfer is also improved.

According to the above-described embodiment, the following operational effects can be achieved.
(1) The burner 10 of the present invention communicates with the discharge hole 349 in the air with respect to the discharge hole 349 side of the burner tip 340, and has a substantially frustoconical cavity 415 that spreads in the direction in which DME as fuel is sprayed. Therefore, the DME discharged from the discharge hole 349 is adjusted in the diffusion state through the hollow portion 415 to form a pseudo incomplete combustion state and spray. It will be burned. Therefore, even when an oxygen-containing fuel such as DME is used, bright flame combustion can be suitably performed, and the amount of radiant heat transfer can be improved.

  Further, according to the configuration of the present invention, the bright flame combustion can be performed by a simple means of installing the cylindrical member 400 at the tip of the burner tip 340, so that an expensive brightness enhancer is not used. Further, bright flame combustion with oxygen-containing fuels such as DME can be realized at low cost, and there is also an advantage that there is no influence on combustion equipment and exhaust gas.

  Furthermore, since the burner 10 of the present invention can perform bright flame combustion even when a clean oxygen-containing fuel such as DME is used, the load is reduced using an existing boiler or heating furnace. Therefore, it is possible to achieve clean combustion of boilers and heating furnaces with less generation of air pollutants such as nitrogen oxides, sulfur oxides, and soot that have been generated in large quantities by heavy oil combustion.

  And since the fuel combustion apparatus 1 of this invention is the fuel combustion apparatus 1 provided with the burner 10 of this invention, the above-mentioned effect can be exhibited suitably and it can apply to a boiler or a heating furnace.

The aspect described above shows one aspect of the present invention, and the present invention is not limited to the above-described embodiment, and is within the scope of achieving the object and effect of the present invention. Needless to say, modifications and improvements are included in the content of the present invention. Further, the specific structure, shape, and the like in carrying out the present invention are not problematic as other structures, shapes, and the like as long as the objects and effects of the present invention can be achieved.
For example, in the above-described embodiment, dimethyl ether (DME) fuel is used as the liquid fuel. However, the present invention is not limited to this, and there is no problem even if methanol or the like is used as the liquid fuel.

  In the above-described embodiment, the tubular member 400 is formed from the first tubular portion 410 and the second tubular portion 420. However, the present invention is not limited to this. There is no problem even if they are formed integrally.

Furthermore, in the above-described embodiment, the burner chip 340 constituting the burner 10 has been described by taking two fuel flow paths (fuel flow paths 341A, 341B, etc.) as an example, but the present invention is not limited to this. The number of the ten fuel flow paths may be one, or may be three or more. Similarly, with regard to the air flow path formed in the burner chip, in the above-described embodiment, the description has been given by taking two air flow paths (air flow paths 346A and 346B) as an example, but the present invention is not limited to this. The burner chip 10 may have one air flow path or three or more air flow paths.
In addition, the specific structure, shape, and the like in the implementation of the present invention may be other structures as long as the object of the present invention can be achieved.

  EXAMPLES Hereinafter, although an Example and a reference example are given and this invention is demonstrated more concretely, this invention is not limited to the content of an Example etc. at all.

[Example 1: DME combustion test]
As Example 1, the fuel combustion apparatus 1 having the configuration shown in FIG. 1 using the gas burner 10 provided with the burner tip 340 having the cylindrical member 400 having the configuration shown in FIG. for cavity 415 of the generally frustoconical shape formed in the tubular member 400 which is disposed the burner tip 340, the opening of the burner tip 340 distal side diameter _{d 1} (first opening 4152) as 5 mm, Table 1 shows the angle θ formed between the axis l of the hollow portion 415 and the inclined portion 4151 and the distance L between the first opening 4152 and the opening opposite to the first opening 4152 (second opening 4153). The combustion state of DME when evaluated as shown in FIG. The results are also shown in Table 1 (Note that blank areas are not evaluated in Table 1).

(Combustion conditions)
Fuel type: Dimethyl ether (DME)
Fuel supply temperature: 15 ° C
Fuel supply pressure: 3.0 MPaG
Oxygen concentration in exhaust gas: 6% by volume
Fuel combustion volume: 50 liters / hour

  On the other hand, as a reference example 1, the shape of the hollow portion 415 formed in the cylindrical member is not a substantially frustoconical shape that spreads in the direction in which fuel is sprayed, but a cylindrical member 400X having a substantially cylindrical shape as shown in FIG. As a reference example, the inner diameter of the cavity is d ′, and the distance between the opening (first opening 4152) on the tip end side of the burner tip 340X and the opening (second opening 4153) on the opposite side of the first opening 4152 The combustion state of DME when L ′ is set as shown in Table 2 below was compared and evaluated. The results are also shown in Table 2 (similar to Table 1, the blank portion is not evaluated in Table 2).

  Here, FIG. 7 is a cross-sectional view showing the internal configuration of the burner tip 340X (applied to the burner 10X) used in Reference Example 1, and FIG. 8 shows the cylindrical member 400X in FIG. FIG. The cylindrical member 400X of Reference Example 1 and the burner chip 340X provided with the cylindrical member shown in FIGS. 7 and 8 have the same structure and the same members as those of the first embodiment. The detailed description is omitted.

  The judgment is based on the evaluation of the combustion state, excellent in luminous flame combustion, ◎ when a bright orange flame is stably obtained, ◯ when good luminous flame is performed, and bright flame combustion The case where it was not performed was performed as x.

(Result: Example 1)

(Result: Reference Example 1)

  As can be seen from the results in Table 1, in the case where a substantially frustoconical hollow portion extending in the direction in which DME sprays is formed on the cylindrical member disposed at the tip of the burner tip as in the first embodiment, In this case, good bright flame combustion was performed, and in particular, when the angle θ was 15 ° to 30 °, the bright flame combustion was excellent, and an orange bright flame could be stably obtained.

  On the other hand, as shown in Table 2, the shape of the hollow portion formed in the cylindrical member is not a substantially truncated cone shape that spreads in the direction in which the fuel is sprayed, but a substantially cylindrical shape as shown in FIG. With respect to the burner and the combustion apparatus of Reference Example 1 using the cylindrical member, it was not possible to perform good bright flame combustion.

[Test example: Confirmation of effect of radiant heat transfer]
For the cylindrical member 400 having the configuration shown in FIG. 5 used in the first embodiment, the diameter d ₁ of the first opening 4152 in the substantially truncated cone-shaped cavity 415 is 5 mm, and the axis l of the cavity 415 is The cylindrical member 400 is used in which the angle θ formed by the inclined portion 4151 is 30 °, and the distance L between the first opening 4152 and the opening opposite to the first opening 4152 (second opening 4153) is 20 mm. Thus, when DME is burned under the following combustion conditions, the flame heat flux (W / cm) at a position where the distance (mm) from the tip of the burner 10 (tip of the cylindrical member 400) is 300 mm and 700 mm. ² ) was measured. The results are shown in Table 3.

  In addition, as a reference example 2, the results obtained by using the burner similar to the above-described configuration except that the cylindrical member is not provided are also shown in Table 3. Moreover, the measurement of a flame heat flux was performed using the commercially available heat flux meter.

(Combustion conditions)
Fuel type: Dimethyl ether (DME)
Fuel supply temperature: 15 ° C
Fuel supply pressure: 3.0 MPaG
Oxygen concentration in exhaust gas: 6% by volume
Combustion amount: 840 MJ / hour

(result)

  From the results shown in Table 3, the heat flux usually decreases as the distance from the burner tip increases, as in Reference Example 2. However, the burner of the present invention in which the cylindrical member having the configuration shown in FIG. When used, the heat flux greatly increased as the distance from the burner increased, and the effect of improving the amount of radiant heat transfer could be confirmed (when the combustion state was observed, the distance from the tip of the burner exceeded about 400 mm, Luminous flame combustion has begun, confirming a significant improvement in the amount of radiant heat transfer).

  INDUSTRIAL APPLICABILITY The burner of the present invention and the fuel combustion apparatus equipped with the burner can be advantageously used in a burner using an oxygen-containing fuel of dimethyl ether (DME) as a liquid fuel and a fuel combustion apparatus equipped with the burner. To be implemented.

It is the schematic diagram which showed the fuel combustion apparatus which concerns on one Embodiment of this invention. It is the top view which showed the burner in the said embodiment. It is sectional drawing which showed the internal structure of the burner in the said embodiment. It is sectional drawing which showed the internal structure of the burner chip | tip in the said embodiment. It is sectional drawing which showed the internal structure of the cylindrical member in the said embodiment. It is sectional drawing which shows the state which attached the cylindrical member to the burner chip | tip. It is sectional drawing which showed the internal structure of the burner chip | tip which comprises the burner used in the reference example 1. FIG. It is sectional drawing which showed the cylindrical member arrange | positioned at the burner chip | tip of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel combustion apparatus 2 Storage tank 3 DME supply pipe 4 Pressurization pump 5 Flow control valve 6 Connection pipe 7 Air storage tank 8 Air supply pipe 10 Burner 61 1st connection pipe 62 2nd connection pipe 100 Burner main body 200 Handle part 300 Spray combustion Part 320A fuel passage part 340 burner tip 341A, 341B fuel flow path 342, 343 fuel supply hole 345 mixing chamber 346A, 346B air flow path 347 air confluence part 348 air supply hole 349 discharge hole 360 air passage part 400 cylindrical member 410 first 1 cylindrical portion 415 hollow portion 420 second cylindrical portion 4151 inclined portion 4152 first opening portion 4153 second opening portion d ₁ diameter d ₂ diameter L distance l axis θ angle

Claims (4)

A burner having a fuel flow channel and a spray medium flow channel formed at the tip of the burner tip for spraying fuel by the pressure of the spray medium from a discharge hole communicating with both the passages;
On the discharge hole side of the burner tip, there is disposed a cylindrical member that is in air communication with the discharge hole and has a substantially truncated cone-shaped cavity that extends in the direction in which the fuel is sprayed. Characteristic burner. The burner according to claim 1, wherein
The angle formed by the axis of the substantially frustoconical hollow portion formed in the cylindrical member and the inclined portion of the hollow portion is 15 ° to 30 °,
The diameter d ₁ of the opening of the burner tip distal side of the hollow portion, the ratio of the distance L between the opening of the distal end side and the opposite side of the _{opening, d 1 / L = 1 /} 2~1 / 6 Burner characterized by being. Fuel storage means for storing liquid fuel;
Spray medium storage means for storing the spray medium;
The fuel flow path and the spray medium flow path are formed, and the liquid fuel supplied from the fuel storage means and the spray medium supplied from the spray medium storage means are supplied to the pressure of the spray medium from the discharge holes communicating with both the passages. A fuel combustion apparatus having a burner with a burner tip at the tip thereof for spraying fuel by
A fuel combustion apparatus, wherein the burner is the burner according to claim 1 or 2. The fuel combustion apparatus according to claim 3, wherein
A fuel combustion apparatus characterized in that the liquid fuel is dimethyl ether (DME).

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