JP2000199611A - Surface combustion regenerative burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use even with a restriction in a combustion space and to perform a simplification by constituting of a first chamber having a porous substance having air permeability installed at an end side and a fuel ejector formed, and a second chamber adjacent to the first chamber and having a thermal storage material installed and a gas supply and exhaust unit provided. SOLUTION: A second chabmer 2 communicating with a first chamber 1 opened at its end side is provided adjacent to the chamber 1. A porous substance 3 having air permeability is installed at an end side of the chamber 1, and its outer surface is constituted at a burner port. A fuel ejector 4 is provided at an end of a fuel supply tube 5 to inject fuel into the substance 3. A thermal storage material 6 is installed in the chamber 2, and an air supply and exhaust unit 7 is provided. Thus, since it becomes a surface combustion near a surface of the substance 3, it can be used even with a restriction in a combustion space from a consideration of a material to be heated. Since the substance 3 is operated as the storage material, it can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface combustion regenerative burner.

[0002]

2. Description of the Related Art A regenerative burner has a structure having a combustion section and a heat storage section as shown in FIG. 8, for example.
The flame is formed forward from the combustion part. Such a regenerative burner performs alternating combustion in which combustion and exhaust are repeated in a cycle of several tens of seconds with two units as a pair, and performs highly efficient combustion by exhaust heat recovery. That is, when one burner is burning, the other burner exhausts (suctions) the combustion gas in the furnace and stores the heat in the heat storage unit. This combustion and exhaust are alternately repeated by the switching valve.

[0003]

However, such a conventional regenerative burner cannot be used when there is a restriction in the combustion space due to consideration of the object to be heated in the furnace due to the long flame. In addition, the regenerative burner has a structure including a combustion section and a heat storage section, so that it is difficult to make the regenerative burner compact. An object of the present invention is to solve such a problem.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a second chamber which communicates with a first chamber whose front end is open is formed, and the first chamber has: A surface-burning regenerative burner in which a porous material having air permeability is provided on the tip side to constitute a flame hole portion and a fuel ejection portion, and a second chamber is provided with a heat storage body and a supply / exhaust portion. Suggest.

Further, the present invention proposes, in the above configuration, a configuration in which the fuel ejection section ejects fuel into the porous material.

In the present invention, it is proposed that, in the above configuration, the fuel jetting portion jets fuel to the outside of the first chamber close to the porous material.

Further, the present invention proposes, in the above configuration, a configuration in which the fuel ejection section ejects fuel into the first chamber close to the porous material.

According to the present invention, it is proposed that the porous material in the above-mentioned configuration be a sintered metal fiber, a cloth-like body formed of a heat-resistant metal fiber, or a three-dimensional network structure made of ceramic.

According to the regenerative burner of the present invention described above, the combustion is a surface combustion in which the combustion is carried out near the surface of the porous material. it can. In addition, since the porous material serving as the combustion section also functions as a heat storage, the amount of the heat storage in the heat storage can be reduced, and thus the regenerative burner can be made compact.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of a regenerative burner to which the present invention is applied, and FIG. 2 shows a main part thereof. Reference numeral 1 denotes a first chamber whose front end is open, and a second chamber adjacent to the first chamber 1 and communicating therewith.
The chamber 2 is constituted. In this case, the sectional shape on the opening side of the first chamber 1 is not limited to a circle as shown in the figure, but may be an ellipse, a square, a polygon, or the like. A porous material 3 having air permeability is installed on the tip side of the first chamber 1, and the outer surface of the porous material 3 is configured as a flame hole portion, and a fuel ejection portion 4 is configured. The fuel ejection section 4 is formed on the front end side of a fuel supply pipe 5 installed at the front end side from the rear end side of the first chamber 1. The fuel ejection section 4 ejects fuel into the porous material 3. It has a configuration. In the second chamber 2, a heat storage unit 6 is installed, and a supply / exhaust unit 7 is configured.

In the above configuration, during combustion, the supply / exhaust section 7 of the second chamber 2 is operated as an air supply section, through which combustion air (or oxygen) is supplied from the second chamber 2 into the first chamber 1. At the same time, fuel supplied through the fuel supply pipe 5 is ejected from the ejection port 8 of the fuel ejection section 4 into the porous material 3. The combustion air supplied from the supply / exhaust section 7 is supplied to the second chamber 2
Flows into the first chamber 1 through the heat storage unit 6 installed in the storage unit, but is preheated by the heat stored in the heat storage unit 6 at the time of the previous exhaust. The combustion air flowing into the first chamber 1 is
It flows inside the porous material 3 and flows toward the surface side of the porous material 3 while mixing with the fuel ejected from the ejection port 8 of the fuel ejection portion 4. At this time, the heat was stored in the porous material 3 at the time of the previous exhaust. Preheated by heat. In this way, the combustion air and fuel mixed on the surface side of the porous substance 3 reach the outside, are leached out of the minute gaps of the porous substance 3, and burn stably on the surface as shown in FIG. Combustion can be performed inside the porous material 3 in addition to burning outside the surface side of the porous material 3 as described above, and these can be adjusted by the fuel ejection position, the density of the porous material, and the like.

Next, at the time of exhaust, the supply / exhaust portion 7 is operated as an exhaust portion, and when the inside of the first chamber 1 is sucked through the exhaust portion, the combustion gas of the pair of other regenerative burners flows through the furnace (not shown). From the surface side of the porous material 3, flows into the first chamber 1 through the inside, flows into the second chamber 2, passes through the heat storage body 6, and is discharged through the air supply / exhaust portion 7. You. At the time of the above exhaust, heat of the combustion gas is stored in the porous material 3 and the heat storage body 6 constituting the flame hole portion, and the heat stored in the porous material 3 is used for preheating air and fuel during combustion, The heat stored in the heat storage body 6 is used for preheating the air during combustion.

The structure and the number of the fuel ejection sections 4 for ejecting fuel are appropriate, and FIGS. 3 to 6 show another embodiment of the fuel ejection sections 4. That is, FIG. 3 shows a configuration in which a disc-shaped ejection body 9 having a number of ejection ports 8 formed at the tip of the fuel supply pipe 5 is installed, and fuel is ejected forward from the plurality of ejection ports 8. FIG. 4 shows a configuration in which branch pipes 10 are formed radially at the tip of a fuel supply pipe 5 and a large number of injection ports 8 are formed in front of each of the branch pipes 10. In this embodiment, fuel is also transferred forward. It is a configuration to squirt. FIG. 5 shows a configuration in which a disc-shaped ejection body 11 is provided at the tip of the fuel supply pipe 5, and this ejection body 11 has a large number of ejection ports 8 formed on the outer periphery of the side surface.
Therefore, the fuel is ejected in the radial direction. Further FIG.
The fuel supply pipe 12 is provided outside the first chamber 1 instead of the fuel supply pipe 5 passing from the other end to the tip end of the first chamber 1 in the above embodiment, and This is a configuration provided on the inner wall of the chamber 1. In this configuration, fuel is ejected from the outer peripheral side of the porous substance 3 to the inside.

Further, in the embodiment shown in FIG. 1, the fuel ejection section 4 is configured to eject fuel into the porous substance 3, but may be configured as shown in FIGS. . That is, in FIG. 7, the fuel ejection unit 4 is configured to eject the fuel to the outside of the first chamber 1 close to the porous material. That is, in this embodiment, the configurations of the fuel supply pipe 5 and the ejection port 8 are the same as those in FIG.
Is located near the surface outside the porous material 3. In this manner, in the supply mode in which fuel is ejected to the outside of the surface side of the porous material 3, there is no danger of flashback even when air or oxygen as an oxidant exceeds the ignition temperature of the fuel due to preheating. In FIG. 8, the fuel ejection unit 4 is configured to eject the fuel into the first chamber 1 close to the porous material 3. That is, in this embodiment, the configurations of the fuel supply pipe 5 and the ejection port 8 are the same as those in FIG. 1, but the ejection port 8 is located in the vicinity of the porous material 3 inside the first chamber 1. I have.
As described above, in the supply mode in which the fuel is ejected into the first chamber 1 close to the porous material 3, the fuel and the air and the like are mixed in the space before flowing into the porous material 3, so that the fuel is more uniform. Combustion becomes possible.

When the regenerative burner of the present invention is used at a low temperature, ignition by a heat source such as a pilot burner or a spark is required. In this case, since the porous material 3 also exceeds the ignition temperature, the ignition is easily performed without such a heat source.

Further, in the present invention, as the porous material 3, a material formed of a sintered metal fiber, a cloth material formed of a heat-resistant metal fiber, a ceramic three-dimensional network structure, or the like is used. Can be.

Further, in the present invention, as the heat storage member 6, a suitable heat storage material such as a ceramic ball or a honeycomb can be used in addition to a porous material similar to the porous material constituting the flame hole.

[0018]

As described above, the present invention has the following effects. a. Since the combustion is a surface combustion in which the combustion is performed in the vicinity of the surface of the porous material, it can be used even when there is a restriction in the combustion space due to the consideration of the object to be heated. b. Since the porous material as the combustion part also acts as a heat storage body, the regenerative burner can be made compact.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of a regenerative burner to which the present invention is applied.

FIG. 2 is a sectional view of a main part showing a state of a flame in a regenerative burner to which the present invention is applied.

FIG. 3 is a perspective view of a main part showing an embodiment of a fuel ejection section applied to the present invention.

FIG. 4 is a perspective view of a main part showing another embodiment of a fuel ejection section applied to the present invention.

FIG. 5 is a main part perspective view showing still another embodiment of a fuel ejection section applied to the present invention.

FIG. 6 is a main part perspective view showing another embodiment of the regenerative burner to which the present invention is applied.

FIG. 7 is a main part perspective view showing still another embodiment of the regenerative burner to which the present invention is applied.

FIG. 8 is a perspective view of a main part showing still another embodiment of the regenerative burner to which the present invention is applied.

FIG. 9 is a schematic diagram showing a conventional regenerative burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st chamber 2 2nd chamber 3 Porous material 4 Fuel ejection part 5 Fuel supply pipe 6 Heat storage material 7 Supply / exhaust part 8 Injection port 9 Ejector 10 Branch pipe 11 Ejector 12 Fuel supply pipe

Claims (7)

[Claims] 1. A second chamber which communicates with a first chamber having an open front end side, wherein a porous material having air permeability is provided on the front end side of the first chamber to form a flame hole. A refueling burner comprising: a fuel injection section; a heat storage body in the second chamber; and a supply / exhaust section. 2. The regenerative burner according to claim 1, wherein the fuel ejection section is configured to eject fuel into the porous material. 3. The fuel ejection section includes a first fuel injection portion which is in close proximity to the porous material.
2. The regenerative burner according to claim 1, wherein the fuel is ejected to the outside of the chamber. 4. The fuel ejection section includes a first fuel injection portion adjacent to the first porous material.
2. A regenerative burner according to claim 1, wherein the fuel is injected into the chamber. 5. The porous material is a sintered metal fiber.
The surface-burning regenerative burner according to any one of claims 1 to 4, 6. The porous material according to claim 1, wherein the porous material comprises a cloth-like body formed of a heat-resistant metal fiber.
Surface-burning regenerative burner 7. The surface-burning regenerative burner according to claim 1, wherein the porous material is a three-dimensional network structure made of ceramic.