JP3824426B2 - Concentration burner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a flat rich mixing portion in which a rich gas mixture nozzle is formed on one end side and a flat light mixing portion in which a light mixture flame nozzle is formed on one end side are aligned in the width direction. A direction in which a flow straightening plate for rectifying the light mixture discharged from the light mixture flame port is arranged in parallel alternately as the installation direction and orthogonal to the side direction It is related with the concentration combustion apparatus provided with the attitude | position in alignment with.
[0002]
[Prior art]
The above-described lean combustion apparatus has the lean mixture portion and the light mixture portion alternately arranged in parallel, and the lean mixture flame opening is provided so as to be close to the rich flame generated in the dense mixture flame mouth. Burned while holding the flame by the rich flame generated in the flame outlet for the rich mixture, and burning the fuel gas with a large air mixing ratio as a whole, It is configured to perform stable combustion while suppressing the generation of NOx, which is nitrogen oxide as much as possible. Conventionally, only a rectifying plate for rectifying the light mixture is provided in the flame mixture for the light mixture. (See, for example, JP-A-7-269816).
[0003]
[Problems to be solved by the invention]
However, in the conventional lean burner, in order to further suppress the generation of NOx, for example, when the ratio of the lean mixture to the rich mixture is increased while increasing the air mixing ratio as the whole fuel gas, the lean mixture is increased. The flow rate of was increased, causing the following problems.
In other words, if the flow rate of the light mixture increases, the light flame generated at the flame outlet for the light mixture becomes unstable and causes a lift phenomenon. Since the flame outlet and the light mixture flame outlet are close to each other, the deep flame also causes a lift phenomenon under the influence of the light flame, and there is a possibility that the lift phenomenon occurs as a whole burner.
[0004]
Accordingly, the present invention has been made paying attention to such a point, and an object thereof is to provide a concentration combustion apparatus capable of stable combustion while further suppressing the generation of NOx.
[0005]
[Means for Solving the Problems]
In order to achieve this object, according to the first aspect of the present invention, in order to generate a vortex flow in the light mixture flame opening due to the flow of the light mixture, Also, a wide eddy current forming member is provided.
In other words, the vortex forming member provides a location where the light mixture is not discharged, and the vortex is actively generated at that location, so the lift phenomenon of the pale flame can be suppressed by the suction force caused by the vortex, and the rich flame caused by the pale flame Can prevent adverse effects.
Therefore, even if the air mixing ratio is increased and the flow rate of the light mixture is increased, it can be burned sufficiently by the flame holding action of the rich flame, and the lift phenomenon as a whole burner is suppressed and NOx is generated. Stable combustion is possible while further suppressing the above.
[0006]
Further, according to the invention described in claim 1, vortex forming member, than the rectifying plate in and juxtaposed direction along the direction perpendicular to the arrangement direction includes a first swirl member wide, first vortex flow thereof Forming members are provided at both ends and an intermediate portion in the juxtaposed direction in the light mixture flame opening.
In other words, a portion where the light mixture does not discharge between the rich flame and the light flame is provided, and a portion where the light mixture is not discharged between the light flames is provided so that the rich flame and the light flame, or between the light flames Since eddy currents are generated during this period, the eddy currents can suppress not only the lift phenomenon of the light flame but also the lift phenomenon of the dense flame, and stable combustion is possible while further suppressing the generation of NOx. .
[0007]
According to the second aspect of the present invention, the vortex forming member includes the second vortex forming member extending in the juxtaposed direction, and the second vortex forming member is orthogonal to the juxtaposed direction in the light mixture flame opening. A plurality are provided along the direction.
Therefore, it is possible to positively generate eddy currents at a plurality of locations in a direction orthogonal to the juxtaposed direction to suppress the lift phenomenon of the light flame.
That is, by for claim 1 cooperation of, arrangement direction, and, in the direction of both orthogonal to the arrangement direction, while suppressing the lift phenomenon, pale flame to be able to flame holding, the NOx overall burner Stable combustion is possible while further suppressing generation.
[0008]
According to the third aspect of the present invention, the first vortex forming member is provided at both ends and the central portion in the juxtaposed direction in the fresh mixture flame opening, and the second vortex forming member is provided at both ends. The first eddy current forming member provided and the first eddy current forming member provided in the central portion are provided, and each second eddy current forming member is substantially wider at both end portions and narrower at the central portion side. It is configured in a triangular shape.
In other words, by providing the first eddy current forming members only at both ends and the central part, each second eddy current forming member is made wider at both end parts and narrow at the central part side while preventing an increase in flow resistance. By forming the triangular shape, a relatively large amount of the light flame is burned on the center side, and the second eddy current forming member is widened on both end sides where the rich flame and the light flame are close to each other. By doing so, it is possible to make the portion where the light air-fuel mixture does not discharge comparatively wide and to increase the suction force by the vortex, thereby suppressing the flame lift phenomenon.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The concentration combustion apparatus of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the light / dark combustion apparatus includes a burner case 1, an inner rectangular box-like frame frame 2, and the like in the burner case 1, and a plurality of flat sheet metals. A thick burner 3 as a thick mixing portion made of metal and a plurality of light burners 4 as thin mixing portions made of flat sheet metal are alternately arranged side by side in the width direction as a box shape. Housed in the frame 2. A thickening burner 3 is arranged at both ends in the juxtaposed direction.
A fan 5 for supplying combustion air is provided below the burner case 1, and its discharge port is located between the bottom of the burner case 1 and the bottom of the box-shaped frame 2. In communication with the forming air chamber 6.
[0010]
As shown in FIG. 6, the concentration burner 3 is formed by bending a series of plate materials, and is used for injecting and burning a concentrated mixture having a small air mixing ratio. A rich mixture flame outlet 7 formed of a plurality of slit-shaped flame holes 7a is formed. A rich mixture flow path 8 communicating with the rich mixture flame port 7 is provided in a state of bulging on both sides in the width direction of the rich burner 3, and is an end opposite to the rich mixture flame port 7. The part is provided with a thickening inlet 9 for introducing fuel gas and combustion air.
[0011]
As shown in FIG. 7, the light burner 4 is for injecting and burning a light air-fuel mixture having a large air mixing ratio, and on the upper surface side thereof, a light air-fuel flame comprising an elongated rectangular opening. A mouth 10 is formed. The light mixture flow passage 11 communicating with the light mixture flame port 10 is provided in a state of bulging on both sides in the width direction of the light burner 4, and is on the opposite side of the light mixture flame port 10. A light inlet 12 for introducing fuel gas and combustion air is provided at the end.
As shown in FIG. 4, the light burner 4 includes a plurality of rectifiers for rectifying the light mixture discharged from the light mixture flame port 10 at a location adjacent to the light mixture flame port 10. A corrugated flow straightening plate 13 is provided in a posture along the longitudinal direction of the elongated thin air-fuel mixture flame mouth 10 and over almost the entire length of the elongated thin air-fuel mixture flame mouth 10 in the longitudinal direction. It is configured so as to be substantially flush with the light mixture flame outlet 10 and to have a mesh shape in plan view.
[0012]
Further, in the light burner 4, a eddy current having a width wider than that of the rectifying plate 13 is formed in the light mixture flame port 10 in order to generate a vortex in the light mixture flame port 10 due to the flow of the light mixture gas. A member U is provided. The eddy current forming member U has a first eddy current forming member 17 provided in a posture along a direction orthogonal to the juxtaposed direction of the burners 3 and 4, a posture along the juxtaposed direction of the burners 3 and 4, etc. It comprises a plurality of second eddy current forming members 18 provided at intervals.
The first eddy current forming member 17 is provided over almost the entire longitudinal direction of the light mixture flame port 10 at the both ends and the middle portion in the juxtaposed direction in the light mixture flame port 10. It has been. The second eddy current forming member 18 includes a first eddy current forming member 17 a provided at both ends of the light mixture flame port 10 and a first eddy current forming member provided at the center portion of the light mixture flame port 10. 17b, and is configured to have a substantially triangular shape that is wider toward both ends of the light mixture flame outlet 10 and narrower toward the center of the light mixture flame opening 10.
[0013]
The thickening inlet 9 provided in the thickening burner 3 and the thinning inlet 12 provided in the thin burner 4 are all arranged in parallel in the same direction. The introduction port 9 is located above and the light introduction port 12 is located below, and concentrated fuel gas and light fuel gas are distributed and supplied to the front surfaces of both the introduction ports 9 and 12. A gas header 14 is provided.
The gas header 14 is provided with a concentration gas nozzle 15 and a light gas nozzle 16. The gas gas nozzle 15 faces each concentration introduction port 9, and the light gas nozzle 16 faces each light introduction port 12. Yes. That is, the same number of thickening gas nozzles 15 as the thickening burners 3 are provided, and the lightening gas nozzles 16 are provided twice as many as the lightening burners 4.
[0014]
The enrichment inlet 9 has a relatively small opening area, and a predetermined part of combustion air flowing from the air chamber 6 to the gas header 14 side is mainly generated by ejecting fuel gas from each enrichment gas nozzle 15. Are sucked at a ratio of 1 and introduced into each of the thickening inlets 9.
In this way, the fuel gas and the combustion air introduced from each of the rich inlets 9 are sufficiently mixed with each other while flowing through the bent rich mixture flow path 8, and the rich mixture after mixing is mixed. Is discharged from the rich gas mixture nozzle 7 and burned.
[0015]
Further, the light introduction port 12 has an opening area larger than that of the concentration introduction port 9, and the effect of the ejector action described above cannot be obtained, and a part of the combustion air flowing from the air chamber 6 to the gas header 14 side is obtained. The pump 5 is configured to be pushed in at a predetermined rate mainly by the blowing pressure of the fan 5 and to be introduced into each light inlet 12.
That is, as shown in FIG. 2, air from the air chamber 6 is provided between the inner periphery of the burner case 1 and the outer periphery of the box-shaped frame 2 to cool the box-shaped frame 2 and the burner case 1. However, since the cross-sectional area of the gap is small, the air pressure in the air chamber 6 and the burner case 1 is increased, and most of the air in the air chamber 6 is light. It is configured to be introduced into the service inlet 12.
In this way, the fuel gas and the combustion air introduced from each of the light introduction ports 12 are sufficiently mixed with each other while flowing through the bent light mixture flow path 11, and the light mixture after mixing is mixed. Is discharged from the light mixture flame opening 10 and burned.
[0016]
Further, the gas header 14 is provided with an open / close valve and an adjustment valve for adjusting the amount of supplied gas in a gas supply path (not shown) for supplying fuel gas to the gas nozzle 15 for concentration and the gas nozzle 16 for light, respectively. As described above, it can be adjusted in accordance with a desired heating amount.
[0017]
Then, as shown in FIG. 5, the first eddy current forming members 17a and 17b provide a portion where the light mixture is not discharged in the light mixture flame port 10 to actively generate a vortex, The lift phenomenon of the light flame can be suppressed by the suction force, and further, even if the light flame causes the lift phenomenon, the adverse effect of the light flame on the rich flame can be prevented.
Therefore, in order to further suppress the generation of NOx, even if the ratio of the light mixture to the rich mixture is increased while increasing the air mixing ratio as the entire fuel gas, the flow rate of the light mixture increases, By generating the eddy current, the lift phenomenon of the light flame can be prevented, and the adverse effect of the light flame on the rich flame can be prevented.
[0018]
Further, in the second vortex forming member 18, similarly to the first vortex forming members 17 a and 17 b, a portion where the light mixture is not discharged in the light mixture flame outlet 10 is arranged in the direction in which the burners 3 and 4 are arranged in parallel. By providing a plurality at intervals, each second eddy current forming member 18 can positively generate a vortex, and the lift phenomenon of the light flame can be suppressed by the suction force of the vortex.
Therefore, in both the parallel direction of the burners 3 and 4 and the direction orthogonal to the parallel direction, it is possible to hold the light flame while suppressing the lift phenomenon, and the generation of NOx is further increased as a whole burner. Stable combustion is possible while suppressing.
[0019]
[Another embodiment]
(1) Although the first eddy current forming member 17 and the second eddy current forming member 18 are provided as the eddy current forming member U in the above embodiment, only the first eddy current forming member 17 may be provided. Alternatively, only the second eddy current forming member 18 may be provided.
[0020]
(2) In the above embodiment, each of the second eddy current forming members 18 is configured in a substantially triangular shape that is wider toward both ends in the juxtaposed direction and narrower toward the center in the juxtaposed direction. It is not restricted to such a structure, You may comprise so that it may become the same width | variety in the juxtaposition direction.
[0021]
(3) In the above embodiment, the rectifying plate 13 is formed in a wave shape, but the shape and the number of the rectifying plates 13 are not limited to this, and various other changes are possible.
[Brief description of the drawings]
1 is a partially cutaway perspective view of a light and dark combustion apparatus. FIG. 2 is a vertical side view of the light and dark combustion apparatus. FIG. 3 is a vertical rear view of the light and dark combustion apparatus. 5] Diagram showing the relationship between deep flame and light flame [Fig. 6] Perspective view of thick burner [Fig. 7] Perspective view of light burner [Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 Concentrated mixing part 4 Light mixing part 7 Concentrated mixture flame port 10 Light mixed gas flame port 13 Current plate 17 First eddy current forming member 18 as eddy current forming member Second eddy current forming member as eddy current forming member

Claims (3)

A flat rich mixing part with a rich mixture flame port formed at one end and a flat light mixing part with a light mixture flame mouth formed at one end alternately with the width direction as a parallel direction And a rectifying plate for rectifying the light mixture discharged from the light mixture flame opening in the light mixture flame opening in a posture along a direction orthogonal to the parallel arrangement direction. A light and dark combustion apparatus provided,
In order to generate a vortex in the light mixture flame opening by the flow of the light mixture, a vortex forming member wider than the rectifying plate is provided in the light mixture flame mouth ,
The eddy current forming member includes a first eddy current forming member that is along the direction orthogonal to the parallel direction and wider than the rectifying plate in the parallel direction,
The concentration combustion apparatus in which the first eddy current forming member is provided at both end portions and an intermediate portion in the juxtaposed direction in the light mixture flame opening . The eddy current forming member includes a second eddy current forming member along the juxtaposed direction , and a plurality of the second eddy current forming members are provided along a direction orthogonal to the juxtaposed direction in the fresh gas mixture flame opening. The light and dark combustion apparatus according to claim 1. The first eddy current forming member is provided at both ends and the center of the juxtaposed direction in the fresh mixture flame mouth, and the second eddy current forming member is provided at the both ends. The second eddy current forming member provided across the forming member and the first eddy current forming member provided at the central portion is substantially triangular with the width wider toward the both end portions and narrower toward the central portion side. The light and dark combustion apparatus according to claim 2, which is configured as follows .

Images