JP2001099410A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed a comparatively large amount of combustion air in a thin fuel-air mixture passage without increasing the thickness of a combustion part, and besides to generate a uniformed flame along a long burner port, and to reduce the occurrence of combustion noise. SOLUTION: An air-fuel mixture flow passage 9 having one end with which a burner port 8 communicates and the other end opened to an introduction port 10, is formed at a juxtaposed flat combustion part 4 and as a bent flow passage by which a direction of a flow is inverted at a lateral one side. The air-fuel mixture flow passage 9 is formed in a flat shape, where the width direction of the combustion part 4 forms the short flank side, in cross section in the flow direction of air-fuel mixture throughout a overall length in a flow direction. Combustion air is forcibly fed in the air-fuel mixture flow passage 9. A gas feed pipe 20 is situated in a spot near the introduction port 10 of the air-fuel mixture flow passage 9 in a state extend along the longitudinal direction of the flat shape of the air-fuel mixture flow passage 9, and a plurality of gas injection holes 21 are formed in a row-form state along the longitudinal direction of the gas feed pipe 20. A combustion device formed in a manner described above is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus in which a plurality of flat combustion portions having a long flame opening are arranged side by side in the width direction.

[0002]

2. Description of the Related Art As such a combustion device, for example,
A plurality of rich burners as flat combustion units are arranged side by side to discharge and burn a rich air-fuel mixture with a relatively low air mixing rate from a long flame outlet, and burn from the middle of the rich burners in the arrangement direction. A so-called Bunsen burner configured to supply secondary air for use is known. In such a Bunsen burner, conventionally, each rich burner is configured as shown in FIG.

[0003] That is, as shown in FIG. 9, each thick burner 30 is formed as a bent flow path whose flow direction is reversed at one lateral side, and one of the elongate flame outlets is formed at one of the flow paths. An air-fuel mixture flow path 33 having an inlet 32 having a relatively small opening area is provided on the other side, and a gas nozzle 34 for ejecting fuel gas faces the inlet 32 having a small opening area. It is configured such that the combustion air is sucked at a predetermined rate mainly by the ejector action by blowing the fuel gas from the gas nozzle 32 and is supplied from the inlet 32 into the mixture flow path 33. It had been.

[0004]

However, in the above-described prior art, the combustion air is supplied into the air-fuel mixture flow path 33 by the ejector action by blowing the fuel gas from the gas nozzle 34. In relation to pressure,
There is a limit to the amount of combustion air that can be supplied into the mixture flow path 33, and there is a problem in that it is not possible to supply a large amount of combustion air.

In order to solve such a problem, for example, as shown in FIG. 10, the mixture path 36 of each enrichment burner 35 is formed in a vertical cross section in the flow direction of the mixture.
Over the entire length in the flow direction of the air-fuel mixture, a flat shape in which the width direction of the flat thick burner 35 is a short side,
The gas nozzle 3 is inserted into the inlet 37 which is also formed in a flat shape.
It is conceivable that the combustion air blown by the blowing means such as a fan is pushed into the air-fuel mixture flow path 36 by the blowing pressure of the blowing means through the inlet 37 of the air-fuel mixture. .

With the improved structure shown in FIG. 10, it is possible to increase the opening area of the mixture passage 36 in the vertical section without making the enrichment burner 35 particularly thick in the width direction. Mixture flow path 3 having the large opening area
6, a relatively large amount of combustion air can be supplied because the combustion air is pushed in and supplied by the blowing pressure of the blowing means. However, since the fuel gas is ejected from the gas nozzle 38 facing the introduction port 37 into the air-fuel mixture flow path 36 having a flat longitudinal cross-sectional shape and supplied, the fuel gas is uniformly distributed along the longitudinal direction of the flat shape. The fuel gas cannot be supplied, and the fuel gas is supplied in a state where the fuel gas is deviated in the longitudinal direction of the flat shape.

Accordingly, in the above-described improved structure, the fuel gas and the combustion air are mixed while passing through the mixture flow passage 36, but the mixing is insufficient, and the long flame port 39 is not provided. Therefore, a uniform air-fuel mixture cannot be discharged from the nozzle, and uneven flame is generated along the elongated flame port 39. In some cases, there is a problem that a large combustion noise is generated.

The present invention focuses on such a conventional problem. It is an object of the present invention to make a relatively large amount of combustion in a mixture flow path without increasing the thickness of each combustion section in the width direction. It is an object of the present invention to provide a combustion apparatus that can supply air and generate uniform flame along a long flame port, thereby reducing combustion noise.

[0009]

In order to achieve this object, according to the first aspect of the present invention, a plurality of flat combustion portions having an elongated flame port are formed in a width direction. A combustion device which is arranged side by side as a line-up direction, wherein the combustion unit has a bent flow path whose flow direction is reversed at one lateral side of the combustion unit when viewed in the line-up direction of the combustion unit. A mixture flow path is formed, one of which is connected to the flame port, and the other is provided with an inlet port, and the mixture path has a vertical cross-sectional shape in the flow direction of the mixture. Combustion air that is formed in a flat shape with the width direction of the combustion section being a short side over the entire length in the gas flow direction, and is blown by the blowing means through the introduction port with respect to the air-fuel mixture flow path. Is configured to be pushed and supplied by blast pressure, A gas supply pipe for supplying a fuel gas into the aeration flow path is disposed at a position near the inlet of the mixture flow path in a state along a longitudinal direction of a flat shape in a longitudinal section of the mixture flow path, A plurality of gas ejection holes are provided in a row along the longitudinal direction of the supply pipe.

That is, the bent air-fuel mixture flow path has a flat shape in which the width direction of the combustion section is the shorter side over the entire length of the air-fuel mixture in the longitudinal cross-sectional shape in the flow direction of the air-fuel mixture. With this configuration, it is possible to increase the opening area in the longitudinal section of the air-fuel mixture flow path without increasing the thickness of each combustion section in the width direction, and to blow air through the inlet to the air-fuel mixture flow path. Since the combustion air blown by the means is pushed and supplied by the blowing pressure, a large amount of combustion air is supplied as compared with the conventional case where the combustion air is supplied mainly by the ejector action accompanying the ejection of the fuel gas. Can be supplied. A gas supply pipe for supplying a fuel gas into the air-fuel mixture flow path is disposed at a position near the inlet of the air-fuel mixture flow path in a state along the longitudinal direction of the flat shape in the longitudinal section of the air-fuel mixture flow path, and Since the gas supply pipe is provided with a plurality of gas ejection holes in a row along the longitudinal direction, the plurality of gas ejection holes are formed along the longitudinal direction of the mixture flow path having a flat shape in a longitudinal section. Will be located. Therefore, the fuel gas ejected from the plurality of gas ejection holes is supplied in a state of being dispersed along the longitudinal direction of the flat mixture passage, and thereafter, while flowing through the bent mixture passage. It is mixed with the combustion air in a uniform state. Therefore, in the elongated flame port, it is possible to discharge and burn the air-fuel mixture uniformized in the longitudinal direction, and to generate a uniform flame in the elongated flame port, Combustion noise can be reduced.

According to the second aspect of the present invention, the gas supply pipe is disposed at an intermediate portion in a width direction along a short side of the air-fuel mixture flow path, and the plurality of gas ejection holes are provided in the gas supply pipe. Each of the pipes is arranged in a row along the longitudinal direction at each of the positions distributed in the width direction along the short side of the air-fuel mixture flow path.

That is, the gas supply pipe is disposed at an intermediate portion in the width direction along the short side of the air-fuel mixture flow path, and fuel gas is supplied from a gas ejection hole of the gas supply pipe disposed at the intermediate portion. Since the fuel gas is supplied in a state of being distributed in the width direction along the short side of the mixture flow path, as described above, the combustion gas is dispersed in the longitudinal direction with respect to the combustion air flowing through the flat mixture flow path. In addition to being supplied in a state of being mixed, it is also supplied in a state of being dispersed in the width direction along the short side of the air-fuel mixture flow path, and subsequent mixing is further promoted, and the A more uniform flame can be produced.

[0013] According to the third aspect of the present invention, the plurality of gas ejection holes are arranged so that the fuel gas is directed in a direction perpendicular to the flow direction of the combustion air or in a direction downstream from the flow direction. It is opened to spout out.

Therefore, the supply of the fuel gas to the combustion air is ensured, and the fuel gas is introduced even if the gas supply pipe is arranged in front of the inlet in order to make full use of the length of the mixture path. The fuel gas can be reliably supplied to and mixed with the combustion air without fear of leaking out of the mouth.

According to the fourth aspect of the present invention, the gas supply pipe is disposed in the gas mixture flow path, and the gas supply pipe is provided at a portion of the gas mixture flow path closer to the inlet than the gas supply pipe is disposed. When viewed in the flow direction of the combustion air, a shielding portion that shields a flow path portion between the inner surface along the longitudinal direction of the flat shape in the longitudinal section of the mixture flow path and the gas supply pipe is provided.

For example, as shown in FIG. 11, a gas supply pipe
0a is an intermediate portion in the width direction along the short side of the air-fuel mixture channel 9a formed in a flat shape with the width direction of the combustion portion 4a as the short side in the longitudinal sectional shape in the flow direction of the air-fuel mixture;
The plurality of gas ejection holes 21a are arranged in the gas mixture flow path 9a, and are provided in the gas mixture pipe 9a.
It is conceivable that the fuel gas is opened so that the fuel gas is ejected toward the downstream side in the flow direction of the combustion air at the position distributed in the width direction along the short side of the fuel gas.

FIG. 11 shows an inlet 1
The flow of combustion air pushed in from 0a is supplied by the gas supply pipe 20a to the inner surface along the longitudinal direction of the flat shape in the longitudinal section of the mixture flow path, that is, both ends in the width direction along the short side of the mixture flow path 9a. Therefore, a difference occurs in the flow velocity of the combustion air in the width direction along the short side of the air-fuel mixture flow path 9a, and a vortex of the combustion air is generated. And the more the amount of combustion air is increased,
The flow velocity of the combustion air flowing along the inner surface along the longitudinal direction of the flat shape in the longitudinal section of the mixture flow path, that is,
Since the flow velocity of the combustion air at both ends in the width direction along the short side of the mixture flow passage 9a increases, the position where the vortex of the combustion air is generated by the high flow velocity is located downstream of the flow direction of the combustion air. Side, and in some cases, a swirl of the combustion air is generated near the gas ejection holes 21a.

Therefore, in the comparative structure shown in FIG. 11, a swirling flow of the combustion air is generated near the gas ejection hole depending on the amount of the combustion air, and the gas ejection hole is formed by the swirling flow of the combustion air. There is a risk that the fuel gas will be blocked, the amount of fuel gas jetted will decrease, and the amount of fuel gas supplied to the amount of combustion air will decrease.

However, when viewed from the flow direction of the combustion air, the flat portion of the mixture flow passage in the longitudinal direction of the flat cross section in the longitudinal direction of the mixture flow passage is located closer to the inlet side than the gas supply pipe in the mixture flow passage. Since the shielding portion for shielding the flow path portion between the inner surface along the gas supply pipe and the gas supply pipe is provided, the combustion air flowing along the inner surface along the longitudinal direction of the flat shape in the longitudinal section of the mixture flow path. Flow velocity,
That is, in FIG. 11, the flow velocity of the combustion air at both ends in the width direction along the short side of the air-fuel mixture flow path 9a can be reduced, and even if the amount of the combustion air increases, the combustion air The vortex generation position is prevented from moving downstream in the flow direction of the combustion air, and the generation position can be maintained upstream in the longitudinal direction of the combustion air.

That is, irrespective of the increase in the amount of combustion air, it is possible to maintain the generation position of the vortex of the combustion air on the upstream side in the flow direction of the combustion air. Even if it is increased, the swirling flow of the combustion air is not generated near the gas ejection holes, and the supply amount of the fuel gas with respect to the amount of the combustion air can be appropriately maintained.

According to the fifth aspect of the present invention, the shielding portion moves a portion of the mixture flow passage closer to the introduction port than an arrangement position of the gas supply pipe toward the introduction port, the shorter side of the mixture flow passage. Is formed so as to be narrower in the width direction along.

That is, the portion of the mixture flow passage closer to the inlet than the gas supply pipe is arranged so that the downstream side in the flow direction of the combustion air becomes wider in the width direction along the shorter side of the mixture flow passage. The combustion air flows so as to gradually spread in the width direction along the short side of the air-fuel mixture flow path, and the flow of the combustion air becomes smooth. Therefore, for example, the shielding portion is formed by forming a portion on the inlet side of the gas mixture flow path from the disposition position of the gas supply pipe to have the same width in the width direction along the short side of the gas mixture flow path. The flow of combustion air is smoother than in the case where the air is used, the combustion air can be supplied stably, and stable combustion can be performed.

According to the invention as set forth in claim 6, the inlet is provided closer to the one lateral side than the center position in the lateral width direction of the combustion part when viewed in the direction in which the combustion parts are arranged. A blower is arranged near the inlet and so as to overlap with the combustion part when viewed in a direction of air-fuel mixture discharge from the flame outlet.

Therefore, the entire apparatus including the air blowing means for blowing the combustion air can be made compact, and the length of the air-fuel mixture flow path can be shortened. Since the supply of fuel gas to the combustion air is performed evenly, the mixing of the fuel gas with the combustion air is good, and the flame can be made uniform with respect to the flame outlet despite the fact that the entire apparatus can be made compact. Can be generated.

According to the seventh aspect of the present invention, in the arrangement direction of the combustion portions, a space between adjacent ones of the plurality of combustion portions and an outside of the combustion portions located at both ends in the arrangement direction. In addition, there is disposed a rich combustion section that discharges and burns a rich air-fuel mixture having a lower air mixing ratio than the air-fuel mixture discharged from the flame outlet and burned.

In other words, a rich-burning apparatus is provided in which the rich burning section is disposed between adjacent ones of the above-mentioned plurality of burning sections and outside the burning sections located at both ends in the arrangement direction. On the basis of the flame holding action of the rich flame generated in the rich combustion section, the lean mixture discharged from the flame port of each combustion section can be stably burned. As described above, in order to suppress the generation of NOx, which is a nitrogen oxide, by burning the fuel gas with a large air mixing ratio as a whole apparatus, as described above, the light-mixed gas flow path having a flat longitudinal section and a large opening area is used. Even if a large amount of combustion air is pushed in by the blowing pressure of the blowing means and supplied, a uniform flame is generated in the elongated flame port, so that the combustion gas burns with a large air mixing ratio. This is particularly effective in a device.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a combustion apparatus according to the present invention is applied to a concentration combustion apparatus will be described with reference to the drawings. As shown in FIGS. 1 to 3, the light-and-dark combustion apparatus has a rectangular burner case 1 and a box-shaped frame 2 in a plan view, and the box-shaped frame 2 is inserted into the burner case 1. The burner 3 is provided in a state of being housed, and is composed of a total of five flat burners made of sheet metal as a dense burner, and a total of four burners 4 made of flat metal as burners. In the state where the longitudinal direction is along the long side of the rectangular box-shaped frame 2, the width direction is set as the arranging direction, and the thick burners 3 are alternately arranged so as to be located at both ends in the arranging direction. It is stored and held in the box-shaped frame 2.

The rich burner 3 discharges and burns a rich air-fuel mixture having a low air mixing ratio, and is formed by bending a series of metal plates as shown in FIG. On the side, there is formed an elongated flame 5 for rich mixture composed of a plurality of slit-shaped holes 5a, and a rich mixture flow path 6 having a flat cross section communicating with the flame 5 for rich mixture 5 is formed. , The enrichment burner 3 is provided so as to protrude to both sides in the width direction, and an enrichment introduction port 7 for introducing fuel gas and combustion air is opened downward at one lower side. It is provided in the state where it does. The rich mixture flow path 6 extends upward from the rich inlet 7 opening downward when viewed from the side, that is, when viewed in the direction in which the burners 3 and the light burners 4 are arranged side by side. And is bent so as to extend to the other side and communicate with the rich mixture flame 5 at one lateral side thereof.

The light burner 4 discharges and burns a light air-fuel mixture having a high air mixing ratio, and is formed by bending a series of metal plates as shown in FIG. A light mixture flow passage 8 is formed as a light mixture gas passage 8 formed as a long and elongated opening, and has a flat cross-sectional shape communicating with the light mixture gas discharge opening 8. 9 is provided in a state where the light burner 4 is bulged to both sides in the width direction. That is, the light mixture flow passage 9 has a flat cross-section in the flow direction of the light mixture, and has a flat shape with the width direction of the light burner 4 as a short side. A light inlet 10 having a flat vertical cross-sectional shape with the short side in the width direction of the light burner 4 is also provided on the front side of the burner case 1 at a portion slightly closer to the other side. It is provided in a state where it opens toward.

The lean gas flow passage 9 is provided closer to the lateral side than the central position in the width direction of the lean burner 4 when viewed in the direction in which the burners 3 and the lean burners 4 are arranged. The air inlet 10 is formed as a bent flow path extending from the lean inlet 10 to one lateral side, and the flow direction is reversed at the one lateral side. The light introduction port 10 is configured to open on the other side. And, the lean gas flow path 9
As described above, the longitudinal cross-sectional shape in the flow direction of the lean mixture is configured to be a flat shape with the width direction of the lean burner 4 as a short side, and over the entire length in the flow direction of the lean mixture, The light burner 4 is formed in a flat shape with the width direction as the short side.

In the light mixture flow passage 9, a narrow portion 11 formed by bending the plate material of the light burner 4 inward from both sides is provided in a passage portion from the bent portion to the light mixture gas outlet 8. Is provided over the entire width of the lean mixture passage 9 in the combustion portion side view, and acts as a throttle on the lean mixture flowing through the lean mixture passage 9 to produce a lean mixture flame. It is configured so that the amount of the lean mixture discharged from the port 8 is made uniform in the longitudinal direction of the lean mixture flame 8,
A plurality of corrugated plates 12 and flat plates 13 acting as rectifying plates are provided in the light mixture gas outlet 8 along the longitudinal direction of the elongated light mixture gas outlet 8. The flame outlets 8 are arranged alternately over substantially the entire length.

The burner case 1 is formed such that, when viewed in the direction in which the combustion sections are arranged, the other side of the burner case 1 is notched, ie, the front side of the burner case 1 is notched. In the state of being inserted into the cutout portion, that is, in the discharge direction of the air-fuel mixture from the rich-air mixture flame 5 and the light-air mixture flame 8, the dark burner 3 and the light mixture A fan 1 as a blowing means for supplying combustion air to the rich burner 3 and the light burner 4 in a state overlapping with the burner 4
4 are arranged. The fan 14 is arranged with its discharge port facing rearward, and the discharge port communicates with an air box 16 provided with a punching metal 15. The light inlets 10 are connected to each other, and the combustion air blown by the fan 14 is configured to be supplied from each light inlet 10 into the light mixture flow channel 9 by the blowing pressure. ing.

A plurality of ventilation holes 17 are provided in the rear side wall of the air box 16, and a part of the air flowing out of the ventilation holes 17 is supplied from the concentration inlet 7 of each concentration burner 3. It is configured to be supplied into the rich mixture flow path 6 as combustion air by an ejector action described later.
The remainder of the air flowing out of the ventilation holes 17 flows upward through the gap between the burner case 1 and the box-shaped frame 2 to cool the periphery of the box-shaped frame 2. Have been.

The thickening inlet 7 of the thickening burner 3 is opened downward, and the lightening inlet 10 of the lightening burner 4 is opened forward. A gas header 18 for distributing and supplying the rich fuel gas and the lean fuel gas is provided below the rich inlet 7 and the lean inlet 10.
The gas header 18 is provided with a total of five rich gas nozzles 19 and a total of four light gas supply pipes 20. Each of the enrichment gas nozzles 19 faces the enrichment inlet 7 having a relatively small opening area, and is configured to eject fuel gas upward to blow the fuel gas into each enrichment inlet 7. A part of the air that has flowed into the box-shaped frame 2 from the ventilation hole 17 of the air box 16 is sucked at a predetermined ratio by an ejector action by blowing gas, and the concentrated mixture flow path 6 is drawn from each concentration introduction port 7. It is configured to be supplied into.

Each of the lean gas supply pipes 20 penetrates through each of the lean burners 4 from below, and extends along the longitudinal direction of the flat shape of the lean air-fuel mixture flow path 9 having a flat longitudinal section. Mouth 1
It is arranged so as to be located inside the light mixture flow path 9 near zero. Further, as shown in FIG. 4, each of the lean gas supply pipes 20 is arranged so as to be located substantially at the center in the width direction along the short side of the flat lean air-fuel mixture flow path 9. A plurality of gas ejection holes 21 are provided in the pipe 20 in a state of being arranged in a row along the longitudinal direction thereof.
Are arranged in the width direction along the short side of the flat lean air-fuel mixture flow path 9 around the axis L along the longitudinal direction.

That is, a plurality of gas ejection holes 21 are arranged along the longitudinal direction of the gas supply pipe 20 at each of the positions of the gas supply pipe 20 which are distributed in the width direction along the short side of the lean gas flow path 9. And a plurality of gas ejection holes 21 are provided in the flow direction F of the combustion air in the air-fuel mixture flow path 9 at a flow angle of about 45 degrees outward in the flow direction F. The fuel gas is opened toward the side.

In the lean mixture flow passage 9, a portion of the lean mixture supply passage 20 closer to the lean inlet 10 than the disposition position of the lean gas supply pipe 20 is flattened in a vertical cross section of the lean mixture passage 9 in the flow direction of the combustion air. A shielding portion 22 that shields a flow path portion between the inner surface along the longitudinal direction of the shape and the light gas supply pipe 20 is provided. The shielding portion 22 is located closer to the light inlet 10 than the light gas supply pipe 20 is located in the light mixture flow path 9.
The side portion is formed so as to be narrower in the width direction along the short side of the light mixture gas flow path 9 toward the light inlet 10. More specifically, the shielding unit 22
Is formed by bending the plate material of the light burner 4 at the portion on the light inlet side of the light mixture gas flow path 9 from the disposition position of the light gas supply pipe 20 to the inside from both sides.

In the light and shade combustion apparatus having such a configuration, the thick burner 3 and the light burner 4 are arranged side by side with the longitudinal direction along the long side of the rectangular box-shaped frame 2. Because it is installed, compared to the short side,
Although the length of the light burner 4 becomes longer, the thick burner 3
Thus, the number of light burners 4 can be reduced. And
The fuel gas and the combustion air introduced from each of the rich introduction ports 7 are sufficiently mixed with each other while flowing through the bent rich mixture flow path 6, and the rich mixture after mixing is used for the rich mixture. It is discharged from the flame port 5 and burned. In addition, each gas supply pipe 20
From the plurality of gas ejection holes 21 provided in two rows along the longitudinal direction of the flat shape of the lean mixture channel 9 and the flow direction F of the combustion air.
Is ejected obliquely at an angle of approximately 45 degrees with respect to
Is supplied to the combustion air in a uniform state also in the lateral width direction, and then is sufficiently mixed while flowing through the bent light mixture channel 9, and the light mixture after mixing is mixed. Air is discharged from the light mixture gas outlet 8 and burned.

In this manner, the fuel gas from the lean gas supply pipe 20 is supplied from the plurality of gas ejection holes 21 extending in two rows in the longitudinal direction and the width direction of the lean mixture flow path 9 having a flat longitudinal sectional shape. Since the mixture is supplied in a uniform state, the mixing with the combustion air flowing in the lean mixture passage 9 is performed evenly, and therefore, even if the lean mixture passage 9 is relatively short, the mixture is well mixed. The lean mixture can be discharged from the lean mixture flame 8 and burned, and stable combustion can be performed based on the flame holding action of the rich flame generated in the rich mixture flame 5, and the entire apparatus As a result, the fuel gas is burned at a high air mixing ratio, and the generation of NOx, which is a nitrogen oxide, can be suppressed.

Further, as shown in FIG. 4, the provision of the shielding portion 22 makes it possible to reduce the flow velocity of the combustion air at both ends in the width direction along the short side of the lean mixture flow passage 9,
Even if the amount of combustion air increases, the generation position of the vortex of combustion air is prevented from moving downstream in the flow direction of combustion air, and is maintained upstream in the flow direction of combustion air. In this way, the supply amount of the fuel gas with respect to the amount of the combustion air is appropriately maintained.

In addition, since the flow of the combustion air is changed by the lean gas supply pipe 20 to both ends in the width direction along the short side of the lean mixture passage 9, the short flow of the mixture passage 9a is reduced. Difference occurs in the flow velocity of combustion air in the width direction along the side,
A vortex of the combustion air is generated, and the generation position of the vortex of the combustion air moves downstream in the flow direction of the combustion air as the flow velocity of the combustion air increases. . However, the flow rate of the combustion air at both ends in the width direction along the short side of the light mixture flow path 9 is reduced by the shielding portion 22, and the amount of the combustion air is increased,
Even if the flow rate of the combustion air is slightly increased, the position where the vortex of the combustion air is generated does not move downstream in the flow direction of the combustion air, but is maintained upstream in the flow direction of the combustion air. That is, an appropriate amount of fuel gas is injected from the plurality of gas injection holes 21 to the combustion air.

[Another Embodiment] (1) In the above embodiment, the lean gas supply pipe 20 is passed through the lean burner 4, and the lean gas supply pipe 20 is arranged in the lean gas mixture passage 9. As shown in FIG. 7, the lean gas supply pipe 20 is disposed in front of the lean inlet 10 in a state along the longitudinal direction of the flat shape of the lean mixture channel 9, as shown in FIG. It may be arranged so as to be located substantially at the center in the width direction along the short side of the light mixture channel 9. Also in this other embodiment, two rows of gas ejection holes 21 are formed in the width direction along the short side of the light mixture flow path 9 around the axis L along the longitudinal direction of the light gas supply pipe 20. The openings are open in a distributed manner and directed outward at about 45 degrees with respect to the flow direction F of the combustion air in the lean-mixture flow path 9. Note that, in this other embodiment, the shielding portion 22 shown in the previous embodiment is not provided.

(2) In the embodiments described above, the lean gas supply pipe 20 is arranged substantially at the center in the width direction along the short side of the lean gas flow path 9, and a plurality of lean gas supply pipes 20 are provided in the lean gas supply pipe 20. Although the example in which two gas ejection holes 21 are provided is shown, various changes can be made to the arrangement of the light gas supply pipes 20 and the number of rows of the gas ejection holes 21. For example, as shown in FIG. 8, in front of the light mixture gas flow path 9, the light gas supply pipe 20 is arranged so as to be shifted to one side in the width direction along the short side of the light mixture gas flow path 9, and The gas ejection holes 21 are provided in only one row, and the fuel gas is ejected from the one row of gas ejection holes 21 toward the other side in the width direction along the short side of the lean gas flow path 9. Can also. Incidentally, in another embodiment shown in FIG.
On the other side of the arrangement position of the light gas supply pipe 20 in the width direction along the short side of, the light introduction port side portion of the light mixture gas flow path 9 is arranged to be lighter than the light gas supply pipe 20. The shielding portion 22 is formed so as to be narrower in the width direction along the shorter side of the light-air mixture flow path 9 toward the inlet.
Is composed of

(3) In the embodiments described above, the plurality of gas ejection holes 21 are set at 45 degrees with respect to the flow direction F of the combustion air.
Although an example in which the opening is directed to the downstream side by about degrees is shown, various changes can be made to the opening direction of the gas ejection hole 21, for example, the opening in a direction orthogonal to the flow direction F of the combustion air. Or it can be opened in a direction along the flow direction F. Further, the lean gas supply pipe 20 may be arranged inside the lean gas flow path 9 so as to be slightly away from the lean inlet 10 instead of near the lean inlet 10.
In this case, the gas outlet 21 may be opened slightly upstream with respect to the flow direction F of the combustion air.

(4) In the above embodiments, the shielding unit 2
2, the light inlet side of the lean gas supply pipe 20 in the lean gas flow passage 9 is narrower in the width direction along the shorter side of the lean gas flow passage 9 toward the light inlet. Although the example which is constituted by forming as shown,
For example, in the light mixture flow passage 9, a flat longitudinal section of the light mixture flow passage 9 in a vertical cross section in the flow direction of the combustion air is provided at a position closer to the light introduction port than the disposition position of the light gas supply pipe 20. The shielding part 22 can also be configured by providing a shielding member that shields a flow path portion between the inner surface along the direction and the light gas supply pipe 20. In addition, the shielding unit 22
The width in the width direction along the short side of the light mixture flow path and the length in the flow direction of the combustion air can be appropriately changed. For example, the light gas supply pipe 2 in the light mixture flow path 9 can be changed.
It is also possible to make the light-inlet-port side portion of the light-inlet-air-portion side at the same width in the width direction along the short side of the light-air-mixture flow path than the arrangement position of zero.

(5) In the embodiments described above, when viewed in the direction in which the dark burner 3 and the light burner 4 are arranged, the light inlet is located closer to one side than the center of the light burner 4 in the width direction. 10 and a fan 14 is disposed on the other side of the side, so that the rich burner 3 and the light burner can be viewed in the discharge direction of the air-fuel mixture from the rich-mixture flame 5 and the light-mixture flame 8. Although the example in which the fan 14 is arranged so as to overlap with the example 4 is shown, various changes can be made to the arrangement of the fan 14. For example, when viewed in the direction in which the dark burner 3 and the light burner 4 are arranged, a light inlet 10 is provided on the other side of the light burner 4 in the width direction, and the light mixture passage 9 is formed in the light burner 4. It is configured to extend from the air inlet 10 to one lateral side, bend in an inverted state at one lateral side thereof, and communicate with the light-mixture flame 8, and close to the light inlet 10. Fan 1
The fan 14 is arranged so that the fan 14 does not overlap with the rich burner 3 or the light burner 4 in the discharge direction of the air-fuel mixture from the rich-air mixture flame 5 or the light-air mixture flame 8. You can also.

(6) In the above embodiments, as an example of the combustion device, a rich burner 3 for burning a rich air-fuel mixture with a small air mixing ratio and a lean burner for burning a light air-fuel mixture with a large air mixing ratio are provided. 4 is shown alternately, but the present invention can also be applied to a combustion device in which a plurality of burners for burning air-fuel mixtures having the same air mixing ratio are provided in parallel. The number of burners to be used can be appropriately changed according to the capacity of the combustion device.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a concentration combustion device.

FIG. 2 is a longitudinal rear view of the concentration combustion device.

FIG. 3 is a vertical sectional side view of the concentration combustion device.

FIG. 4 is a cross-sectional plan view of a main part of the concentration combustion device.

FIG. 5 is a perspective view of a thick burner.

FIG. 6 is a perspective view of a light burner.

FIG. 7 is a longitudinal sectional side view of a concentration combustion device showing another embodiment.

FIG. 8 is a cross-sectional plan view of a main part of a concentration combustion apparatus showing another embodiment.

FIG. 9 is a partially cutaway side view of a dark burner showing a conventional structure.

FIG. 10 is a perspective view of a dark burner showing an improved structure.

FIG. 11 is a cross-sectional plan view of a main part of the concentration combustion device showing a comparative structure.

[Explanation of symbols]

 3 Rich Burning Section 4 Burning Section (Light Burning Section) 8 Flame Port (Light Burning Flame Port) 9 Mixture Flow Path 10 Inlet Port (Light Inlet Port) 14 Blowing Means 20 Gas Supply Pipe (Light Gas Supply Pipe) 21 Gas Vent hole 22 Shielding part F Flow direction of combustion air

Claims (7)

[Claims] 1. A combustion apparatus in which a plurality of flat combustion parts having a long flame opening are arranged side by side in the width direction thereof. When viewed in the direction in which the parts are arranged, the combustion part is formed as a bent flow path that reverses the flow direction at one lateral side of the combustion part, and the flame port is communicated with one of the flow paths,
On the other side, an air-fuel mixture flow path having an opening is provided, and the air-fuel mixture flow path has a width in the longitudinal section in the flow direction of the air-fuel mixture, over the entire length in the flow direction of the air-fuel mixture, the width of the combustion section. It is configured to have a flat shape in which the direction is the short side, and is configured such that the combustion air blown by blowing means is pushed into and supplied by the blowing pressure to the air-fuel mixture flow path through the inlet. A gas supply pipe for supplying fuel gas into the mixture flow path,
A plurality of gas ejection holes are arranged along the longitudinal direction of the gas mixture pipe along the longitudinal direction of the gas mixture pipe along the longitudinal direction of the flat shape in the longitudinal section of the gas mixture path, and along the longitudinal direction of the gas supply pipe. Combustion devices provided in rows. 2. The gas supply pipe is disposed at an intermediate portion in a width direction along a short side of the air-fuel mixture flow path, and the plurality of gas ejection holes are formed in a short side of the gas-air mixture flow path in the gas supply pipe. The combustion device according to claim 1, wherein each of the combustion devices is arranged in a row along the longitudinal direction at each of the positions distributed in the width direction along the width direction. 3. The plurality of gas ejection holes are opened so as to eject fuel gas in a direction orthogonal to a flow direction of the combustion air or in a direction downstream from the flow direction. The combustion device according to claim 1. 4. The gas supply pipe is disposed in the air-fuel mixture flow path, and at a portion of the air-fuel mixture flow path closer to an inlet than an arrangement position of the gas supply pipe, as viewed in the flow direction of the combustion air. The combustion device according to claim 3, wherein a shielding portion that shields a flow path portion between the gas supply pipe and an inner surface along a longitudinal direction of a flat shape in a vertical cross section of the air-fuel mixture flow path is provided. 5. The shielding portion is configured such that a portion closer to an inlet than an arrangement position of the gas supply pipe in the mixture flow channel becomes narrower in a width direction along a shorter side of the mixture flow channel toward the inlet. 5. The combustion device according to claim 4, wherein the combustion device is formed by the following manner. 6. The intake port is provided closer to the one side portion than the center position in the width direction of the combustion portion when viewed in the direction in which the combustion portions are arranged, and the blower is provided near the introduction port. The combustion device according to any one of claims 1 to 5, wherein the combustion device is disposed so as to overlap with the combustion portion when viewed from a direction in which the air-fuel mixture is discharged from the flame outlet. 7. In the direction in which the combustion sections are arranged, the flame is discharged from the flame port between adjacent ones of the plurality of combustion sections and outside the combustion sections located at both ends in the arrangement direction. The combustion device according to any one of claims 1 to 6, further comprising a rich combustion section that discharges and burns a rich air-fuel mixture having a lower air mixing ratio than the air-fuel mixture to be burned.