JP6564035B2 - Burner for mixed fuel - Google Patents

Description

  The present invention relates to a mixed fuel burner, and more particularly, when a mixed fuel obtained by mixing water with fuel is burned, the mixed fuel is reignited when misfire occurs without using a reignition burner. The present invention relates to a mixed fuel burner capable of

  A burner using ordinary fuel can obtain a continuous flame as long as the fuel is continuously sprayed by the fuel nozzle, but when burning so-called mixed fuel in which water and heavy oil are mixed, Even if fuel is sprayed continuously, the flame may not be continuous (fire may be lost). For this reason, the burner for mixed fuel is used as a means for continuous combustion with the mixed fuel. In addition to the nozzle for injecting the mixed fuel, normal fuel is injected and the mixed fuel is immediately re-ignited in case of misfire In many cases, a re-ignition nozzle is attached. An example of a configuration in which a re-ignition nozzle is provided in such a mixed fuel burner is a configuration as disclosed in Japanese Patent Application Laid-Open No. 2007-113887.

JP 2007-113887 A

  In the configuration of the burner for mixed fuel disclosed in Patent Document 1, although it is possible to save the fuel used for the main combustion by using the mixed fuel, as a countermeasure against misfire of the combustion by the mixed fuel used for the main combustion, A re-ignition nozzle (normal fuel nozzle) for injecting normal fuel is used. For this reason, since the normal fuel for supplying to the re-ignition nozzle other than the mixed fuel is required, there is a problem that the fuel saving effect of the entire mixed fuel burner is diminished.

  Accordingly, the present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a re-ignition nozzle even if misfiring occurs when the mixed fuel is burned. Another object of the present invention is to provide a burner for mixed fuel that can re-ignite the mixed fuel.

  As a result of intensive studies by the inventor in order to solve the above-mentioned problems, the following configuration has been conceived. That is, the present invention is formed of a nozzle that injects a mixed fuel composed of water and fuel, a combustion cylinder disposed in front of the nozzle, and a material that can be red-heated by the combustion of the mixed fuel, and the combustion A ring-shaped abutting plate that is disposed in the cylinder and has a first through hole formed in the central portion thereof, and is formed of a material that can be red-heated by the combustion of the mixed fuel and disposed on the abutting plate. And an inner cylinder extending in a forward direction of the first through hole.

  By adopting such a configuration, even when the combustion by the mixed fuel is misfired, the unburned mixed fuel comes into contact with the red-heated abutting plate and the inner cylinder to immediately resume the combustion by the mixed fuel. Can be made. Thereby, the arrangement of the re-ignition means can be omitted, so that the configuration of the mixed fuel burner can be simplified. Further, since fuel consumption by the re-ignition nozzle is eliminated, a mixed fuel burner having a high fuel saving effect can be provided.

  Moreover, it is preferable that the said abutting board is provided with the standing part which stands in a back direction along an outer periphery.

  Thereby, a part of flame which burned the mixed fuel can be directed to the rear side of the combustion cylinder (so-called flashback can be formed), and the misfired mixed fuel can be used as a fire type.

  Moreover, it is preferable that the required range of the front-end | tip part of the said standing part is formed in the bending part bent by the center side of the said combustion cylinder.

  As a result, after a part of the flame that burns the mixed fuel is directed to the rear side of the combustion cylinder, the flame can be directed to the first through hole, and a vortex of the flame is formed in the rear side portion of the abutting plate Can be a misfired mixed fuel. Further, since the flame vortex is finally directed to the front side of the combustion cylinder, the reduction of the thermal power due to the mixed combustion can be minimized.

  By adopting the configuration of the mixed fuel burner according to the present invention, even if the combustion of the mixed fuel by the mixed fuel burner using the mixed fuel obtained by mixing heavy oil and water suddenly stops (misfire), The mixed fuel can be immediately re-ignited when the mixed fuel comes into contact with the abutting plate or the inner cylinder that has been heated red during the combustion of the mixed fuel. For this reason, it is not necessary to provide a re-ignition nozzle, and the overall configuration of the mixed fuel burner can be simplified. In addition, since there is no re-ignition nozzle, fuel consumption of the re-ignition nozzle is eliminated, thereby providing a mixed fuel burner with a high fuel saving effect.

It is a schematic block diagram which shows the whole structure of the burner for mixed fuel concerning 1st Embodiment. It is explanatory drawing which shows the state which faced the inside of the combustion cylinder from the nozzle side (upstream side) in FIG. It is a perspective view of the abutting board and inner cylinder in FIG. FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. It is a schematic block diagram of the combustion cylinder of 2nd Embodiment. It is a schematic block diagram of the combustion cylinder of 3rd Embodiment.

  Hereinafter, embodiments of a burner for mixed fuel according to the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, a mixed fuel burner 100 according to this embodiment includes a nozzle 10, an ignition burner 20 as an ignition means, and a combustion cylinder 30 disposed in front of the nozzle 10 and the ignition burner 20. And an abutting plate 40 and an inner cylinder 50 accommodated in the internal space of the combustion cylinder 30.

  The nozzle 10 is for injecting a mixed fuel obtained by mixing water and heavy oil (A heavy oil). As such a nozzle 10, it is preferable to employ the configuration of a mixing nozzle disclosed in WO2015 / 059759. The ignition burner 20 is for igniting the fine particles of the mixed fuel injected from the nozzle 10 and operates only at the time of ignition, and the operation after once igniting the mixed fuel is stopped. Since the ignition burner 20 can employ a known configuration represented by a gas burner or the like, detailed description thereof is omitted here. Moreover, although the mixed fuel burner 10 in this embodiment is configured to include the ignition burner 20, a configuration in which the configuration of the ignition burner 20 is omitted may be employed. When the configuration of the ignition burner 20 is omitted, the fine particles of the mixed fuel injected from the nozzle 10 may be ignited manually.

  As shown in FIGS. 1 to 4, the combustion cylinder 30 is disposed in front of the nozzle 10 and the ignition burner 20. The combustion cylinder 30 is for guiding in a predetermined direction a flame obtained by burning and burning the fine particles of the mixed fuel ejected from the nozzle 10 by the ignition burner 20. An abutting plate 40 and an inner cylinder 50 formed in a ring shape are accommodated in the internal space of the combustion cylinder 30. Both the abutting plate 40 and the inner cylinder 50 are formed of a material that can be heated red by contact with the flame of the mixed fuel. As such a material capable of red heat, stainless steel (SUS) or the like is preferably used.

  As shown in FIGS. 2 to 4, the abutting plate 40 is disposed in a state orthogonal to the flow path direction in the internal space of the combustion cylinder 30, and a first through hole 42 is formed in the center portion. Yes. An inner cylinder 50 is attached to the front side surface of the abutting plate 40. The inner cylinder 50 is attached so as to extend in the forward direction of the abutting plate 40 with the opening surface aligned with the position of the first through hole 42. Here, the abutting plate 40 and the inner cylinder 50 are integrated by welding. The inner diameter of the inner cylinder 50 is formed to be equal to or larger than the inner diameter of the first through hole 42 of the abutting plate 40. Here, the inner diameter of the inner cylinder 50 and the inner diameter of the first through hole 42 are the same. The abutting plate 40 is provided with second through holes 44 in the circumferential direction along the outer peripheral position of the first through hole 42 at a required interval (here, an interval of 90 degrees). The drilling position of the second through hole 44 is preferably a radially outer position of the combustion cylinder 30 than the outer peripheral surface of the inner cylinder 50.

  As described above, the abutting plate 40 is disposed in the internal space of the combustion cylinder 30 in a state of being orthogonal to the flow path direction of the combustion cylinder 30, so that the flame from the nozzle 10 can be reliably prevented. Can be sprayed on. Further, since the first through hole 42 and the second through hole 44 are formed in the abutting plate 40, the flame blown to the abutting plate 40 is connected to the first through hole 42 and the second through hole 44. A flame can be supplied through the inner cylinder 50 toward the front of the combustion cylinder 30. By adopting such a second through hole 44, it is advantageous in that the inner cylinder 50 can be sprayed with flames on both the inner and outer peripheral surfaces of the inner cylinder 50.

  Since the abutting plate 40 and the inner cylinder 50 to which the flame from the nozzle 10 is sprayed in this way are red-hot by the flame due to the combustion of the mixed fuel, when the flame from the nozzle 10 is misfired, it becomes red-hot. A certain abutting plate 40 and the inner cylinder 50 can be used as fire types. That is, the fine particles of the mixed fuel which are injected from the nozzle 10 and are in an unburned state are immediately ignited by contacting the abutting plate 40 or the inner cylinder 50, and the mixed fuel can be burned.

  Further, on the upstream side surface of the abutting plate 40, an upright portion 45 that stands on the nozzle 10 side (upstream side) is provided along the outer peripheral edge of the abutting plate 40. The upright portion 45 stands perpendicularly to the rear side surface of the abutting plate 40 and extends in the rearward direction, and thereafter, the required range of the tip portion of the upright portion 45 is set to the center side of the combustion cylinder 30 (inside the radial direction of the combustion cylinder 30). ) To the bent portion 45A. By arranging the upright portion 45 and the bent portion 45A as described above, a flame vortex as shown by a broken line arrow A in FIG. 4 can be formed behind the abutting plate 40.

  By forming such a flame vortex, a so-called backfire is formed in the internal space of the combustion cylinder 30. This backfire is caused by the combustion cylinder 30 as shown by a broken line arrow A in FIG. After flowing back in the direction of the flow path by the standing height dimension of the standing portion 45, it is directed to the first through hole 42 (to the center side of the combustion cylinder 30). As a result, the combustion efficiency of the combustion cylinder 30 (mixed fuel burner 100) is hardly reduced, the flame staying time in the abutting plate 40, the upright portion 45, and the bent portion 45A is increased. Red heat can be made more certain. This flashback can also be used as a fire type for reigniting the unburned mixed fuel particles.

(Second Embodiment)
FIG. 5 is an explanatory diagram showing a schematic configuration of the combustion cylinder 30 in the mixed fuel burner 100 according to the second embodiment. 5 is shown in a sectional view, the sectional position in FIG. 5 is the same position as the sectional position in FIG. 4 (line 4-4 in FIG. 2). In the second embodiment, the same components as those in the first embodiment are not described in detail by using the member numbers used in the first embodiment.

  As shown in FIG. 5, in this embodiment, the shape of the upright part 45 standing in the back direction of the abutting board 40 differs. The standing portion 45 according to the present embodiment stands at a right angle with respect to the rear side surface of the abutting plate 40 and extends in the backward direction, and the bent portion 45 </ b> A is not formed at the tip portion of the standing portion 45. The form differs from the combustion cylinder 30 of the first embodiment. By adopting such a configuration of the upright portion 45, the formation range of the flame vortex (broken arrow A) in the rear portion of the abutting plate 40 can be increased as compared with the first embodiment.

  As a result, although the combustion efficiency of the mixed fuel burner 100 is lower than the combustion efficiency of the mixed fuel burner 100 having the configuration described in the first embodiment, the formation range of backfire in the combustion cylinder 30 can be widened. it can. Therefore, the combustion cylinder 30 according to the present embodiment is more convenient as a fire type for reigniting the fine particles of the mixed fuel that is in an unburned state. In addition to the first through hole 42 being formed in the central portion of the abutting plate 40, flame or mixed fuel particles are continuously supplied from the upstream side of the combustion cylinder 30. The fire is directed to the front of the combustion cylinder 30 via the inner cylinder 50 toward the first through hole 42 formed in the abutting plate 40 as indicated by a broken line arrow A.

(Third embodiment)
FIG. 6 is an explanatory view showing a schematic configuration of the combustion cylinder 30 in the mixed fuel burner 100 according to the third embodiment. 6 also has the same cross-sectional position as the cross-sectional position in FIG. 4 (line 4-4 in FIG. 2). In the third embodiment, the same components as those described in the previous embodiment are not described in detail by using the member numbers used in the previous embodiment. As shown in FIG. 6, the combustion cylinder 30 according to the present embodiment is different from the combustion cylinder 30 in the first embodiment and the second embodiment in that the upright portion 45 is not erected on the upstream side surface of the abutting plate 40. The form is different.

  Thus, since the upstream side surface of the abutting plate 40 is formed as a flat surface, so-called backfire is hardly formed on the upstream side surface of the abutting plate 40. However, if the abutting plate 40 and the inner cylinder 50 are in a sufficiently red-hot state due to the flame caused by the combustion of the mixed fuel, the red-hot abutting plate 40 or the inner cylinder 50 is not affected even if a backfire is not formed. It is possible to reignite the fine particles of the mixed fuel that is in an unburned state. The fuel burner 100 according to this embodiment can reduce the manufacturing cost of the abutting plate 40 and thus the mixed fuel burner 100 in that it is not necessary to make the standing portion 45 and the like on the abutting plate 40.

  Although the mixed fuel burner 100 according to the present invention has been described above based on the embodiments, the technical scope of the present invention is not limited to the above embodiments. For example, the abutting plate 40 of the burner 100 for mixed fuel described in the above embodiment has been described in the form in which the first through hole 42 and the second through hole 44 are each drilled in a circular cross-sectional shape. The first through hole 42 and the second through hole 44 can be formed in a shape other than the circular cross-sectional shape. Moreover, the 1st through-hole 42 should just be drilled in the abutting board 40, and the drilling of the 2nd through-hole 44 can also be abbreviate | omitted.

  In the above embodiment, the inner peripheral surface of the combustion cylinder 30 and the outer peripheral surfaces of the abutting plate 40 and the upright portion 45 are in close contact with each other. A spacer (not shown) is disposed on the outer peripheral edge of the plate 40, and a configuration having a gap between the inner peripheral surface of the combustion cylinder 30 and the outer peripheral surface of the abutting plate 40 (and the upright portion 45) is adopted. You can also. By adopting such a configuration, it is advantageous in that the heat of the red-heated abutting plate 40 and the upright portion 45 is not directly propagated to the combustion cylinder 30. For this reason, the spacer (not shown) is preferably made of a material that is nonflammable and has low thermal conductivity. Furthermore, the form of the burner 100 for mixed fuels which combined suitably the structure shown in the said embodiment and modification can also be employ | adopted.

Claims (3)

A nozzle for injecting a mixed fuel composed of water and fuel;
A combustion cylinder disposed in front of the nozzle;
A ring-shaped abutting plate that is formed of a material that can be red-heated by combustion of the mixed fuel and that is disposed in the combustion cylinder and has a first through hole formed in a central portion;
An inner cylinder that is formed of a material that can be red-heated by combustion of the mixed fuel and that is disposed on the abutting plate and extends in the forward direction of the first through hole;
A burner for mixed fuel, comprising:   2. The burner for mixed fuel according to claim 1, wherein an aerating portion that erects in the rearward direction along the outer peripheral edge is provided on the abutting plate.   The burner for a mixed fuel according to claim 2, wherein the required range of the tip portion of the upright portion is formed in a bent portion bent toward the center of the combustion cylinder.

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