JPH08200629A - Thick and thin fuel burner - Google Patents

Abstract

PURPOSE: To suppress the discharge of a thin mixed gas in an unburnt state and to improve stable combustibility by providing a sealing means for preventing the passage of the thin mixed gas between the peripheries of thick burning parts installed at both parallel ends and the inner surface of a casing opposed thereto. CONSTITUTION: This thick mixed gas burner port 6 for burning a thick mixed gas is formed at one end face, and a thin mixed gas burner port 12 for burning thin mixed gas is formed at the end face of the same side as the port 6. A flat thin burning part 9 formed with a thin mixed gas mixing chamber 13 communicating with the port 12 and a thin mixed gas inlet 15 for introducing combustion air is formed between adjacent thick mixed gas burning parts 3 with the parts 3 and a casing 2 as forming members. In this case, sealing means S for preventing the passage of the thin mixed gas between the peripheries of the parts 3 installed at both ends of aligning direction and the inner surface of the casing 2 opposed to the peripheries is provided. Thus, the leakage of the thin mixed gas can be effectively prevented, and hence safe combustion is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thickening mixing chamber which has a thickening flame port for burning a rich mixture formed on one end face and which communicates with the thickening flame port. A plurality of flat rich combustion sections formed with a rich introduction port for introducing the fuel gas and the combustion air are housed in a rectangular cylindrical casing in a state of being arranged side by side with a space therebetween, and the lean air-fuel mixture is stored. A light-burning flame is formed on an end surface on the same side as the rich flame-hole, and a light-mixing chamber communicating with the light-burning flame port, and a light-burning air introduced into the light-mixing chamber. The flat lean combustion unit having a fuel introduction port is formed between adjacent rich burning units with the rich burning unit and the casing as constituent members.

[0002]

2. Description of the Related Art Such a rich-lean combustion apparatus forms a rich flame by stably burning a rich air-fuel mixture which can be independently and stably burned in both rich-burning parts on both sides of the lean-burning part, and in the lean-burning part, a large amount of rich-burn The amount of NOx (nitrogen oxide) generated is reduced by continuously and stably burning the air-fuel mixture by the flame holding action of the rich flames on both sides and lowering the combustion temperature of the entire combustion apparatus. In such a rich-lean combustion apparatus, a plurality of flat rich-burning portions are simply accommodated inside the casing in a state of being aligned with each other, so that the rich-burning portion and the casing are provided between adjacent rich-burning portions. The flat lean burn portion is formed as a constituent member, and the lean burn portion does not need to be separately formed as a dedicated member and has a simple structure. Since the light-burning section has a simple structure in which the rich-burning section and the casing are formed as constituent members, a gap may occur between the peripheral section of the rich-burning section and the inner surface of the casing facing the peripheral section. When a gap is created, a slight air-fuel mixture passes through the gap. Conventionally, no particular consideration has been given to the fact that a gap is created between the peripheral portion of the rich-burning section and the inner surface of the casing facing the peripheral portion, and a slight amount of light air-fuel mixture passes through the gap. .

[0003]

Regarding the formation of a gap between the peripheral portion of the rich combustion portion and the inner surface of the casing opposed to the peripheral portion, in the rich combustion portion other than both ends in the arranging direction, Even if a gap is created, the light air-fuel mixture only moves back and forth between the light combustion portions on both sides of the rich combustion portion, so there is no particular problem. However, in the rich combustion portions at both ends in the parallel installation direction, when the gap is generated, the lean air-fuel mixture will leak from the lean combustion portion on one side of the rich combustion portion to a place other than the lean combustion portion on the opposite side. . In this case, the lean air-fuel mixture that has leaked to a place other than the light-burning section mixes with the surrounding air, and the concentration of fuel gas is further reduced, and the rich flame that serves as flame holding is only on one side. Will be less likely to burn and will be released in a slight, unburned state.
Therefore, there is room for improvement in terms of suppressing the release of the light air-fuel mixture in the unburned state and improving the stable combustibility.

The present invention has been made in view of the above circumstances, and an object thereof is to suppress the release of a light air-fuel mixture in an unburned state and improve the stable combustion property.

[0005]

A first characteristic structure of a rich / lean combustion device according to the present invention is characterized in that a peripheral portion of the rich combustion portion located at both ends in a parallel arrangement direction and an inner surface of the casing opposed to the peripheral portion. The point is that a sealing means is provided to prevent passage of a light mixture between them.

A second characteristic constitution is that the sealing means is constructed by attaching a seal member to the peripheral portion of the rich combustion portion.

According to a third characteristic construction, the sealing means is constructed by attaching a seal member to a portion of the inner surface of the casing facing the peripheral portion of the rich combustion portion.

A fourth characteristic configuration is that a straightening plate for rectifying a light air-fuel mixture, which is arranged between adjacent rich combustion portions, has both side edges thereof overlapped with both end portions of the rich combustion portion. A plate-shaped support body is provided that is joined to the casing and has an inwardly extending opening and an inwardly extending concave portion for fitting the side end portion of the rich combustion portion. In point.

A fifth characteristic configuration is that, in a state in which the side end of the rich combustion section is fitted in the recess, the side edge of the rich combustion section and the side of the casing and the rich flame port are formed. The point is that a projecting piece that projects forward and abuts the support is provided.

In a sixth characteristic configuration, a downward recessed portion into which the projecting piece enters from above is provided at an opening edge of the casing in a state where a side end portion of the rich combustion portion is fitted in the recessed portion. In point.

[0011]

According to the first characteristic configuration, regarding the rich combustion portions located at both ends in the juxtaposed direction, the amount of the light air-fuel mixture between the peripheral portion of the rich combustion portion and the inner surface of the casing opposed to the peripheral portion is provided. Since the sealing means for preventing passage is provided, it is possible to reliably prevent the lean air-fuel mixture from leaking from the lean burn portion on one side of the rich burn portion to a place other than the lean burn portion on the opposite side. it can.

According to the second characteristic construction, after the seal member is attached to the peripheral portion of the rich combustion portion, the rich combustion portion is housed inside the casing, whereby the peripheral portion of the rich combustion portion and its peripheral portion are accommodated. The gap between the inner surface of the casing and the inner surface of the casing facing each other can be sealed. Therefore, the work for providing the sealing means is simple.

According to the third characteristic configuration, before the rich combustion portion is housed in the casing, a seal member is attached to a portion of the inner surface of the casing corresponding to a position facing the peripheral portion of the rich combustion portion. Then, by housing the rich combustion portion inside the casing, it is possible to seal the gap between the peripheral portion of the rich combustion portion and the inner surface of the casing facing the peripheral portion. In particular, when the shape of the seal member is complicated, the work for providing the sealing means becomes complicated. However, in the case of the third characteristic configuration, the seal member is attached according to the inner surface shape of the casing. Therefore, even if the casing has a complicated shape, the sealing means can be easily provided.

According to the fourth characteristic configuration, by fitting the side end portions of the rich combustion portions into the recesses of the plate-like support, the rich combustion portions can be accurately positioned accurately so that they are aligned at a predetermined interval. However, it can be stored inside the casing. Moreover, since the straightening plates for rectifying the light air-fuel mixture, which are arranged between the adjacent rich combustion portions, are provided by joining the both side edges thereof to the both end portions of the rich combustion portion so as to overlap each other, The baffle plate for rectifying the lean air-fuel mixture can be arranged only by the work of housing the combustion part in the casing by fitting the side end part thereof into the recess of the plate-shaped support. Also, by fitting the side ends of the rich combustion section into the recesses of the plate-shaped support, the plate-shaped support partitions the both ends of the fresh-use flame port, and the side ends of the fresh-use flame port are concentrated. It is located on the inner side of the casing from the side end of the flame outlet. Therefore, it is possible to prevent the light air-fuel mixture from being discharged from the lightening port to the side of the casing where the flame holding effect of the rich flame is reduced.

The operation of the fifth characteristic configuration is as follows. In the state where the side end of the rich combustion section is fitted in the recess of the plate-shaped support, a minute opening is formed between the side end of the rich combustion section and the deepest part of the recess of the plate-shaped support. There are cases. Since the minute opening can be covered with a protruding piece,
It is possible to prevent the light air-fuel mixture from being discharged to the side of the casing from the minute opening.

According to the sixth characteristic configuration, when the side end of the rich combustion section is fitted in the recess of the plate-like support, the projecting piece is inserted into the downward recess of the opening edge of the casing, thereby projecting. The piece can more reliably cover the minute opening formed between the side end of the rich combustion portion and the deepest part of the recess of the plate-like support, so that the light air-fuel mixture can flow from the minute opening to the side of the casing. It is possible to further suppress the discharge.

[0017]

According to the first characteristic structure, it is possible to surely prevent the lean air-fuel mixture from leaking to a portion which is not the lean burn portion on the side of each of the rich burn portions located at both ends in the juxtaposed direction. Therefore, it is possible to suppress the release of the light air-fuel mixture in the unburned state, and it is possible to improve the stable combustion property.

According to the second characteristic constitution, the sealing means can be provided by a simple operation, so that the cost for implementing the present invention can be reduced.

According to the third characteristic constitution, it is possible to provide the constitution of the sealing means suitable for the case where the shape of the casing is complicated.

According to the fourth characteristic constitution, since the work of assembling the rich combustion section and the current plate can be simplified, the cost can be reduced.
Further, it is possible to prevent the light air-fuel mixture from being discharged from the lightening flame port to the side of the casing where the flame holding action of the rich flame is reduced, so that the light air-fuel mixture is further released in an unburned state. It was possible to suppress it, and the stable combustion property could be further improved.

According to the fifth characteristic configuration, the light air-fuel mixture is discharged to the side of the casing from the minute opening formed between the side end of the rich combustion portion and the innermost portion of the recess of the plate-like support. Therefore, it is possible to further suppress the release of the light air-fuel mixture in an unburned state and further improve the stable combustion property.

According to the sixth characteristic configuration, the light air-fuel mixture is discharged to the side of the casing from the minute opening formed between the side end of the rich combustion portion and the innermost portion of the recess of the plate-like support. Therefore, it is possible to further suppress the discharge of the light air-fuel mixture in an unburned state, and it is possible to further improve the stable combustion property.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, the burner case 1
In the interior of the bottomed rectangular tubular casing 2, a large number of dense burner burners 3 as flat burner portions are arranged side by side at predetermined intervals, and between the adjacent burner burners 3 for rich combustion. ,
A lean burner 9 as a flat lean burner is formed with the rich burner 3 and the casing 2 as constituent members. A fan 4 for supplying combustion air is arranged below the burner case 1, and a discharge port 4a of the fan 4 is opened at the bottom of the burner case 1, and the bottom of the burner case 1 and the bottom of the casing 2 are arranged. An air chamber 5 is formed between them.

The rich combustion burner 3 is located on one end face and has a flat rich flame port 6 for discharging a rich air mixture having a small primary air mixture ratio upward, and a rich burn port communicating with the rich flame port 6. The mixing chamber 7 and the concentration inlet 8 for introducing the fuel gas and the combustion air into the concentration mixing chamber 7 are configured as main components. The lean combustion burner 9 is located on the end surface on the same side as the rich flame outlet 6, and discharges a lean air fuel mixture having a large primary air mixing ratio upward, and the light lean burn outlet 12. And a light introduction port 15 for introducing combustion air into the light mixture chamber 13 as main components. Further, the light combustion burner 9 includes a light mixing chamber 13
Four straightening vanes 17, 17 for straightening the light air-fuel mixture flowing through
18 and 18 are arranged.

The rich burner 3 will be further described. As shown in FIG. 5, the burner 3 for rich combustion is formed from a single metal plate 16. That is, by bending one of the molded plate materials 16 at a portion corresponding to the thickening flame port 6 and stacking the stacked plate materials 16 between the two stacked plate-shaped bodies 16A and 16B, the rich mixing chamber 7 and the rich mixing chamber 7 Fuel inlet 8 and a lean gas passage 10 of a lean burner 9 described below, which is located below the rich mixing chamber 7, and a fuel gas and fuel air are fed to the lean gas passage 10. While forming the light introduction port 11 to be introduced, the plate-like members 16A, 16B
The edges other than the edges corresponding to the dark inlet 8 and the light inlet 11 are joined by spot welding. In the bent portion, a plurality of thickening flame openings 6 composed of three slit holes are formed. Further, the plate-like body 16A is formed with a pair of protrusions 16a and 16a, and the plate-like body 16B is formed with a pair of protrusions 16b and 16b. The protrusions 16a and 16b have the same shape. , Those protruding portions 16a
When the plate-shaped body 16A and the plate-shaped body 16B are overlapped with each other, the protruding portion 16b and the protruding portion 16b are in a state of overlapping at a position protruding forward and sideward of the rich flame port 6. And the protrusion 16
The a and the protruding portion 16b are joined by spot welding in a state of being overlapped with each other.

The two side edges of each of the two straightening vanes 17 and 18 are superposed on both side edges of the rich burner 3 and joined by spot welding, so that two burner burners 3 are joined to each side. The baffle plates 17 and 18 of one sheet are assembled and fixed. Further, the two rectifying plates 17 and 18 are provided with protrusions 1
Protrusions 17a, 1 having the same shape as 6a, 16b
8a is formed, and the portions of the protrusions 17a and 18a having the same shape as the protrusions 16a and 16b are formed into the protrusions 16a and
6b is superposed and joined by spot welding.

A plurality of inner bulging portions 17a, which bulge in a direction approaching the rich combustion burner 3 when assembled to the rich combustion burner 3, are formed on the inner straightening plate 17 located inside. There is. The outer rectifying plate 18 located on the outer side has an inner bulging portion 18a that bulges in a direction approaching the inner rectifying plate 17 when the burner 3 for rich combustion is assembled. When installed in the
Two inward bulging projections 18b are formed which bulge in the direction close to the. Further, one of the both outer rectifying plates 18 assembled on both sides of the rich burner 3 is formed with seven outward bulging projections 18c which bulge outward when assembled. .

Next, the casing 2 will be described. Each of the pair of opposing open end edges of the casing 2 is bent at an inward angle at a right angle to bend the bent portion 1.
9 is formed, and the bent portion 19 is made to function as a plate-like support extending inward. Further, in the bent portion 19, recesses 20 having substantially the same shape as the cross-sectional shape of the side end portion of the rich combustion burner 3 are arranged at the same pitch as the dense combustion burners 3 are arranged.

The flat combustion burner 3 formed as described above is provided with the protruding portions 16a, 16b, 17a,
With the lower end of the overlapping portion of 18a in contact with the bent portion 19, both end portions of the rich combustion burner 3 are fitted into the recesses 20 of the bent portion 19 to be housed inside the casing 2. In this way, a large number of burners for rich combustion 3
Are sequentially stored in the casing 2,
A large number of rich-burning burners 3 can be housed inside the casing 2 while being accurately positioned so as to be arranged at predetermined intervals. That is, the protrusion 16
The overlapping portion of a, 16b, 17a, 18a is projected to the side of the casing 2 and the tip of the rich flame port 6 in a state where the side end of the rich burner 3 is fitted in the recess 20, and It is configured to function as a protruding piece 22 that comes into contact with the bent portion 19.

Burners 3 for rich combustion located at both ends in the arranging direction
The sealing means S is provided to prevent the passage of the light air-fuel mixture between the peripheral portion and the inner surface of the casing 2 facing the peripheral portion.
The sealing means S is configured by attaching a seal member 21 to the peripheral portion (both side end portions and bottom portion) of the rich combustion burner 3. That is, after the seal member 21 is attached to the peripheral portion of the rich combustion burner 3, the dense combustion burner 3 is housed inside the casing 2 so as to face the peripheral portion of the rich combustion burner 3 and the peripheral portion thereof. It is configured to seal a gap between the casing 2 and the inner surface thereof. The seal member 21 is made of a heat resistant material such as ceramic or glass.

As described above, a large number of rich-burning burners 3 are housed inside the casing 2 so as to be lined up at a predetermined interval, so that the adjacent rich-burning burners 3 are closely spaced from each other.
A flat space defined by the adjacent rich-burning burner 3 and the casing 2 is formed, and the light-burning burner 9 is formed using this space. Further, four straightening vanes 17, 17, 18, 18 are arranged in the space. The inner bulging portions 17a of the inner rectifying plate 17 are located on both sides of the plurality of thickening flame openings 3 formed of three slit holes, and the flow velocity of the light air-fuel mixture is suppressed in this portion to increase the concentration. It is designed to prevent the blowout of flames. The inner bulging protrusions 18b of the outer rectifying plate 18 are spaced apart from the inner rectifying plate 17, and the outer bulging protrusions 18c are adjacent to the outer rectifying plate 18.
It acts so as to maintain the intervals between and.

The light burner 9 will be described.
Between the rich flame openings 6 of the rich combustion burner 3, a light flame opening 12 for discharging a light air-fuel mixture having a large primary air mixing ratio upward.
The lower space communicating with the lightening flame port 12 is formed as a lightening mixing chamber 13, and the lower end of the lightening mixing chamber 13 is supplied from the air chamber 5 to the lightening mixing chamber 13 with combustion air. The light introducing port 15 is configured. A plurality of jet outlets 14 that open to the right side lean burner 9 when viewed from the left side are formed in the lean gas passage 10. However, in the left side view, the light gas passage 10 of the rich burner 3 at the right end
The jet port 14 is not formed in the.

The rich inlet 8 of the rich burner 3 and the lean inlet 11 of the lean burner 9 are arranged so as to be close to each other in the same direction, and near the opening. ,
A rich gas header 23 for distributing and supplying the rich fuel gas and a light gas header 24 for distributing and supplying the lean fuel gas are arranged. Both of these headers 23 and 24 are arranged vertically with the rich gas header 23 facing upward, and a large number of rich gas nozzles 25 are provided in the upper rich gas header 23 and a large number of thin gas headers 24 are provided in the lower lean gas header 24. The gas nozzles 26 are connected to each other.

Each enrichment gas nozzle 25 faces each enrichment inlet 8. When the fuel gas is ejected from this enrichment gas nozzle 25, the combustion air in the air chamber 5 is enriched at a predetermined rate by an ejector action. It is sucked into the intake port 8 and mixed in the course of flowing through the rich mixing chamber 7 to generate a rich mixture, and this rich mixture is discharged from the rich flame port 6. Similarly, each light gas nozzle 26 faces each light introducing port 11, and the jetting of the fuel gas from the light gas nozzle 26 causes the combustion air in the air chamber 5 to be discharged at a predetermined ratio by an ejector action. The mixture gas is sucked into the light introduction port 11, premixed in the process of flowing through the light gas passage 10, and the mixture is ejected from the ejection port 14 of the light gas passage 10 into the light mixing chamber 13. Further, the combustion air in the air chamber 5 is supplied to the light mixing chamber 13 from the light introducing port 15. Then, in the light mixing chamber 13, the ejection port 1
4 mixes the air-fuel mixture with the combustion air from the light-air inlet 15 to generate a light air-fuel mixture.
It is discharged from.

The rich gas header 23 has a rich gas supply path 2
7, a light gas supply path 28 is connected to the light gas header 24, and the fuel supplied to the main gas supply path 29 upstream of the branch points of the gas supply paths 27 and 28 is supplied. A main gas regulating valve V for regulating the total amount of gas is provided. This main gas regulating valve V is for adjusting the combustion amount by changing the amount of fuel gas supplied to the combustion device, and when a low combustion amount that cannot be adjusted even with this main gas regulating valve V is required. Among the plurality of rich burn burners 3 and light burn burners 9 which are provided, only some of the lean burn burners 9 and some of the rich burn burners 3 located on both sides thereof are burned.

Another Embodiment Next, another embodiment will be described. As shown in FIG. 6, in a state where the side end of the rich burner 3 is fitted into the recess 20 at the opening edge of the casing 2, the downward recess 30 into which the protruding piece 22 enters from above.
May be provided.

In the above-described embodiment, the burner 3 for rich combustion is formed by one metal plate material 16, and both side edges of the two straightening vanes 17 and 18 are provided on both side ends of the burner 3 for rich combustion. At the same time when the two pieces are overlapped and joined, the protruding piece 2
2 has been exemplified so that the protruding piece is formed separately from the rich-burning burner 3, and the protruding piece formed in this way is formed on the rich-burning burner 3. It may be configured to be attached.

In the above-mentioned embodiment, the sealing means S is exemplified by the case where the sealing member 21 is attached to the peripheral portion of the rich combustion burner 3, but instead of this, the sealing means S is used.
The seal member 21 may be attached to a portion of the inner surface of the casing 2 facing the peripheral portion of the burner 3 for rich combustion. That is, before housing the rich combustion burner 3 inside the casing 2, the seal member 21 is attached to a portion of the inner surface of the casing 2 corresponding to the position facing the peripheral portion of the rich combustion burner 3, and then, By housing the rich combustion burner 3 inside the casing 2, the gap between the peripheral portion of the rich combustion burner 3 and the inner surface of the casing 2 facing the peripheral portion is sealed.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view of a density combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing a burner for rich combustion at the left end in a left side view of the rich and lean combustion device according to the embodiment of the present invention.

FIG. 3 is a left side view of a longitudinal section of a main part of a rich / lean combustion device according to an embodiment of the present invention.

FIG. 4 is a partially cutaway plan view of a density combustion device according to an embodiment of the present invention.

FIG. 5 is a perspective view of a burner for rich combustion of the rich / lean combustion device according to the embodiment of the present invention.

FIG. 6 is a cutaway perspective view of a rich / lean combustion device according to another embodiment.

[Explanation of symbols]

 2 Casing 3 Thick combustion part 6 Thick flame port 7 Thick mixing chamber 8 Thick inlet 9 Light burn part 12 Light flame port 13 Light mixing chamber 15 Light inlet 17,18 Straightening plate 19 Plate support 20 recessed part 21 sealing member 22 protruding piece 30 downward recessed part S sealing means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Aoki 1-52, Oka 1-chome, Minami-shi, Minato-ku, Osaka, Osaka Prefecture Herman Co., Ltd.

Claims (6)

[Claims] 1. A thickening mixture chamber (7) having a thickening flame port (6) for burning a rich mixture formed at one end face and communicating with the thickening flame port (6), and the thickening mixture chamber (7). A plurality of flat rich combustion sections (3) having a rich introduction port (8) for introducing fuel gas and combustion air into the mixing chamber (7) are provided inside the rectangular tubular casing (2). , A lightening flame port (12) for combusting a light air-fuel mixture is formed in an end face on the same side as the thickening flame port (6), and the lightening flame port ( 12) and a light mixing inlet (1) for introducing combustion air into the light mixing chamber (13).
5) is formed between the adjacent rich combustion sections (3) with the rich combustion section (3) and the casing (2) as constituent members. A rich / lean combustion device, which prevents passage of a lean air-fuel mixture between a peripheral portion of the rich combustion portion (3) located at both ends in the juxtaposed direction and an inner surface of the casing (2) facing the peripheral portion. A density combustion apparatus provided with a sealing means (S). 2. The rich / lean combustion device according to claim 1, wherein the sealing means (S) is configured by additionally providing a seal member (21) on a peripheral portion of the rich combustion portion (3). 3. The sealing means (S) is configured by additionally attaching a sealing member (21) to a portion of the inner surface of the casing (2) facing the peripheral portion of the rich combustion portion (3). The rich / lean combustion device according to claim 1. 4. The flow-straightening plates (17), (18) for lean-air mixture rectification, which are arranged between the adjacent rich-burning sections (3), have their both side edges at the rich-burning section (3). A concave portion which is provided by being overlapped and joined to both side end portions of the casing, extends inwardly at the opening edge of the casing (2), and fits the side end portion of the rich combustion portion (3). The rich / lean combustion device according to claim 1, 2 or 3, further comprising a plate-shaped support (19) in which (20) are arranged in parallel. 5. The casing (2) laterally in the state where the side end of the rich combustion section (3) is fitted into the recess (20) at the side end of the rich combustion section (3). And projecting toward the tip of the thickening flame mouth (6) and supporting the support (1
9. The rich / lean combustion device according to claim 4, further comprising a protruding piece (22) that abuts against 9). 6. The projecting piece (22) is inserted from above in a state where the side end of the rich combustion section (3) is fitted in the recess (20) at the opening edge of the casing (2). The rich / lean combustion device according to claim 5, wherein a downward recess (30) is provided.