JPH0674424A - Burner device - Google Patents

Abstract

PURPOSE:To provide a burner having a simple constitution which produces a reduced volume of nitrogen oxide. CONSTITUTION:Formed centrally on a burner holding stand 1 is a groove 2 having inclined surfaces 3a, 3b which extend in a longitudinal direction. Burners 4 adapted for jetting a mixture gas having a high ratio of fuel gas and burners 5 adapted for jetting a mixture gas having a low ratio of fuel gas are alternately arranged on the inclined surfaces 3a, 3b in a longitudinal direction. A first flame hole zone 6 on the side of the burners 4 and a second flame hole zone 7 on the side of the burners 5 face each other to form an angle theta of 0 to 160 degrees therebetween. A large volume of mixture gas having a lean concentration is jetted around a high temperature flame of a rich fuel gas concentration jetted from the first flame hole zone 6 so as to cover a large area of a combustion surface with a low temperature flame of a lean fuel gas concentration, thus reducing generation of nitrogen oxide due to such low temperature combustion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner device which is incorporated in a combustion device such as a water heater or a bath to burn fuel gas.

[0002]

2. Description of the Related Art As is well known, there are various types of burner devices used in combustion devices for hot water heaters and bath heaters. Recently, there has been a strong demand for the development of a clean combustion burner with a small amount of nitrogen oxides.

[0003]

Various proposals have been made in order to meet the above-mentioned demands, but all of them are not suitable for practical use because they have a problem that the device configuration is too complicated. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a burner device having a simple device configuration and less generation of nitrogen oxides.

[0005]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention is a burner device in which a plurality of flame ports are assembled, and the assembly part of the flame ports has a first flame port zone for ejecting a mixed gas having a high fuel gas ratio and a fuel gas ratio of A second flame outlet zone for ejecting a low gas mixture, the first flame outlet zone and the second flame outlet zone being arranged adjacent to each other, and , A first flame port group and a second flame port group in which the first flame port zone and the second flame port zone are alternately arranged, and the first flame port group and the second flame port respectively. The mouth groups are arranged to face each other in an upright shape, and the fuel gas ratio of the mixed gas ejected from the first flame nozzle zone to the mixed gas ejected from the second flame nozzle zone is 4: 6 to. It is adjusted and set within the range of 3: 7, and the facing angle between the first flame port group and the second flame port group is There is a characteristic structure of the present invention each also be set to within 160 degrees.

[0006]

In the present invention having the above-described structure, during burner combustion, a mixed gas having a high fuel gas ratio is jetted from the first flame port zone, and a fuel gas ratio of the fuel gas ratio is increased from the second flame port zone adjacent thereto. Combustion is performed by ejecting a low gas mixture. At the time of this combustion, the mixed gas ejected from the first flame nozzle zone has a high fuel gas concentration, so that the flame temperature becomes high. On the other hand, the mixed gas ejected from the second flame outlet zone has a low fuel gas concentration, so the flame temperature is low, and the air amount increases as the gas ratio is low, and the mixture gas ejected from the first flame outlet zone. The amount of the low-concentration mixed gas is much larger than that of the high-concentration mixed gas. The low-concentration mixed gas ejected from the second flame port zone receives the high-concentration high-temperature flame temperature ejected from the first flame port zone to stably maintain and burn the flame. Since the volumetric capacity of the mixed gas is much larger than that of the high-concentration gas as described above, the combustion chamber is occupied by the flame of the low-concentration mixed gas with a low flame temperature, and this low-temperature combustion produces nitrogen oxides. Is effectively suppressed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of a burner device according to the present invention. In these figures, the burner holder 1 is provided with a substantially V-shaped groove 2 continuously on the upper surface side in the longitudinal direction, and the burner 4, on both side slopes 3a and 3b of the V-shaped groove 2. 5 are arranged in an array along the longitudinal direction.

In this embodiment, the burner 4 is configured as a burner for ejecting a mixed gas having a high fuel gas ratio, and the burner 5 is configured as a burner for ejecting a mixed gas having a low fuel gas ratio.

The burners 4 and 5 are adjacent to each other in the longitudinal direction, that is, as shown in FIG.
The burner row on the side of the slope 3a and the burner row on the side of the slope 3b are arranged such that burners 4 and 5 having different fuel gas concentrations face each other. In this embodiment, as shown in FIG. 2, the opposing angle θ of the burners 4 and 5 obtained by adding θ ₁ and θ ₂ is such that the mixed gas ejected upward from the burners 4 and 5 is inclined by the Coanda effect. Along with a negative pressure zone is formed in the central region of the burners 4, 5 and an exhaust gas recirculation flow that is attracted to the negative pressure zone side and flows downward in the central region of the combustion chamber is effectively generated, and The adjustment is set so that it is within the range of 0 to 160 degrees as a suitable angle at which combustion noise does not increase.

The plurality of flame ports formed on the slope of the burner 4 form a first flame port zone 6 for ejecting a mixed gas having a high fuel gas ratio, and the plurality of flame ports formed on the slope of the burner 5. Forms a second flame port zone 7 for ejecting a mixed gas having a low fuel gas ratio, and the first flame port zone 6 and the second flame port zone 7 are arranged adjacent to each other, so that the slope 3
The burner device 11 has a first flame port group 8 formed on the a side and a second flame port group 10 formed on the slope 3b side.

The burner device 11 is installed above the premixing device 12 as shown in FIG. Premixing device
12 has a box shape, and a premixing chamber 13 communicating with the burner 4 and a premixing chamber 14 communicating with the burner 5 are partitioned by a partition wall 15 in the internal space thereof, and the upper end side of the premixing device 12 is provided. An opening 18 communicating with the inlet 16 on the bottom side of the burner 4 and an opening 19 communicating with the inlet 17 provided on the bottom side of the burner 5 are provided therein.

The inlet side of the premixing chamber 13 in the premixing device 12
30 and the inlet side 31 of the premixing chamber 14, for example, in FIG.
As shown in FIG. 5, the gas nozzles 21 are arranged to face each other via the agitating mixer 9, or a swirling mixer 20 as shown in FIG.
The fuel gas that has entered the inside 12 becomes a premixed gas mixed with air, and the mixed gas is ejected from the first flame nozzle zone 6 of the burner 4 and the second flame nozzle zone 7 of the burner 5 into the combustion chamber 22. It is like this. The premix chamber such that the fuel gas ratio of the mixed gas ejected from the first flame nozzle zone 6 and the mixed gas ejected from the second flame nozzle zone 7 is 4: 6 to 3: 7.
The size of the passage cross-sectional area from the inlet side 30 of 13 to the inflow port 16 of the burner 4 and the passage cross-sectional area from the inlet side 31 of the premixing chamber 14 to the inflow port 17 of the burner 5 and the premixing chambers 13 and 14 Entrance side 30,
The injection amount of fuel gas entering from 31 is adjusted and set.

For example, when the fuel gas ratio of the mixed gas ejected from the first flame nozzle zone 6 of the burner 4 and the mixed gas ejected from the second flame nozzle zone 7 of the burner 5 is 4: 6, the gas amount is The 4 side is set so as to create a premixed gas with a high gas concentration in which about 0.4 times the theoretical air amount is mixed. On the 6 side, the air amount is about 1.6 times the theoretical air amount. It is adjusted and set so as to produce a premixed gas having a low gas concentration by being mixed, and therefore, in the combustion chamber including the flame port groups 8 and 10, a concentration of a relatively small volume from the first flame port zone 6 is set. Is high (fuel gas ratio is high)
Gas is ejected, and a very large volume of low-concentration gas (having a low fuel gas ratio) is ejected from the second flame port zone 7 side around the high-concentration gas to be combusted.

The stirring mixer 9 is, as shown in FIG.
The premixing chambers 13 and 14 are provided with a plurality of stirring blades 40 obliquely provided around the inlet side of the premixing chambers 13 and 14. The swirl mixer 20 is configured as shown in FIG. 6, for example. That is,
A baffle plate 24 is provided on the tip side of the gas supply pipe 32, a gas ejection hole 25 is formed on the outer peripheral surface of the gas supply pipe 32 immediately below the baffle plate 24, and the fuel gas radially ejected from the gas ejection hole 25. Against the swirler (swirl blade) 26 around it, the air supplied from the fan 33 is applied from a right angle direction to swirlly mix the fuel gas and the air, and the mixed gas is injected into the corresponding premixing chambers. The premixed gas can be fed to the burners 4, 5.

This embodiment is constructed as described above, and its operation will be described below. First, the premixing device 12 produces a mixed gas having a high fuel gas concentration and a mixed gas having a low fuel gas concentration, and the mixed gas having a high concentration is guided to the burner 4 side from the first flame nozzle zone 6 to the combustion chamber. Eject within 22. On the other hand, the low-concentration mixed gas is guided to the burner 5, jetted from the second flame port zone 7 toward the burner slope, and is burned in the combustion chamber 22. At the time of this combustion, since the facing angle between the first flame port group 8 and the second flame port group 10 is set within 0 to 160 degrees, the mixed gas ejected from each flame port zone 6, 7 is burner. Flows upward along the slope.

Due to the flow of the mixed gas along the wall surface, the central region between the first flame port group 8 and the second flame port group 10 inevitably becomes a negative pressure zone, and the wall surface side. The combustion gas rising from above is drawn into the negative pressure zone on the center side and a downward flow is generated, whereby exhaust gas recirculation of the combustion gas is performed. Further, since the mixed gas ejected from the first flame nozzle zone 6 has a high fuel gas concentration, the flame temperature rises,
A wide area range is covered by the flame of a large amount of mixed gas having a low fuel gas concentration, which is ejected from the second flame port zone 7 so as to surround the region where the flame temperature is high. The mixed gas having a low concentration has a low fuel gas concentration by itself and is difficult to burn, but is satisfactorily burned by the heat of the flame in the first flame nozzle zone 6 having a high flame temperature around it, and is burned at about 1400. As a result of the low temperature combustion flame of ℃ or less covering a large area of the combustion chamber, combustion with extremely low production of nitrogen oxides is performed.

As described above, low temperature combustion is performed by the low concentration mixed gas ejected from the second flame port zone 7 in a wide area within the combustion chamber 22, and the exhaust gas recirculation is effective as described above. As a result, combustion with extremely low production of nitrogen oxides was possible, and when the nitrogen oxides of the apparatus of this example were measured, an extremely clean combustion state of about 30 ppm could be obtained.

FIG. 7 shows a second embodiment of the present invention. In this embodiment, a burner 4 for ejecting a mixed gas having a high fuel gas concentration and a burner 5 for ejecting a mixed gas having a low fuel gas concentration are connected via a connecting portion 27 and integrated. By arranging the integrated connecting burners on the upper side of the premixing device 12 shown in FIG. 4 alternately in opposite directions (changing the direction by 180 degrees) along the longitudinal direction, the first embodiment is realized. As in the example, a burner device in which the first flame opening zone 6 and the second flame opening zone 7 are adjacent to each other is formed.

In the second embodiment, the burners 4 and 5 are integrated via the connecting portion 27 to form the connecting burner 28.
Assembling work into the premixing device 12 becomes very easy.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in each of the above-described embodiments, as shown in FIG. 3A, the burner zones 6 and 7 of the burners 4 and 5 are opposed to each other, but unlike this, (b) and FIG. As shown in FIG. 1, the first flames are arranged such that the same flame mouth zones, that is, the first flame mouth zones 6 face each other, and the second flame mouth zones 7 face each other next to each other. The mouth group 8 and the second flame mouth group 10 may be formed. However, in this case,
Since the burner 5 is larger than the burner 4, a width for allowing the large burners 5 to face each other is required. Therefore, the width W of the burner device is wider than that in the first embodiment.
In this respect, if the different flame port zones 6 and 7 are opposed to each other as in the present embodiment, the width W can be made narrower and the size can be reduced.

Further, in each of the above embodiments, the burners 4 and 5 are erected, that is, V-shaped, and are arranged to face each other.
The burner zones 6 and 7 of the burners 4 and 5 may be made flat so that the first flame zone 6 and the second flame zone 7 are alternately arranged. Also in this case, since a mixed gas having a large capacity and a small concentration is ejected around a dense gas mixture having a small capacity to cover a wide combustion area of the combustion chamber 22 with a flame having a low flame temperature, it is possible to generate nitrogen oxides. Low combustion is likewise possible.

Further, in each of the above embodiments, one burner 4 and one burner 5 are alternately arranged along the longitudinal direction of the burner holder 1 so that the burner holder 1 is located next to the first burner zone 6 for one burner. A second burner zone 7 for one burner was provided,
It is not always necessary to alternately arrange the burners 4 and 5 one by one. For example, two (or one) burners 5 are arranged next to one (or two) burner 4 next to each other. The flame opening zones 6 and the second flame opening zones 7 may be alternately formed.

[0023]

As described above, according to the present invention, the first flame port zone having a high fuel gas ratio and the second flame port zone having a low fuel gas ratio are arranged next to each other. A large amount of low-concentration mixed gas ejected from the can be stably burned by receiving the high-temperature flame calorific value of the high-concentration mixed gas ejected from the first flame port zone adjacent to it, and the concentration is low. Since the volume of the mixed gas is much larger than the volume of the concentrated mixed gas, most of the area of the combustion surface of the combustion chamber can be covered with the flame of the mixed gas of low concentration and low flame temperature. Low temperature combustion is performed effectively, and clean combustion with extremely low nitrogen products is possible.

Also, the apparatus structure is extremely simple, and the clean burner apparatus of the present invention can be provided at a low cost.

Further, in the structure in which the first flame port group and the second flame port group are arranged to face each other in a standing shape, the exhaust gas recirculation is further effectively performed, and more nitrogen is discharged. It enables clean combustion with less generation of oxides. In particular, the standing facing angle of the first flame port group and the second flame port group is set to 0
Combustion noise can be reduced by setting it within the range of 160 degrees.

[Brief description of drawings]

FIG. 1 is a perspective configuration diagram of a first embodiment of a burner device according to the present invention.

FIG. 2 is an explanatory diagram of an opposing angle between a first flame port group and a second flame port group.

FIG. 3 is an explanatory diagram of an arrangement mode of a first flame opening zone and a second flame opening zone.

FIG. 4 is an illustration of a premixing device coupled to a burner device.

FIG. 5 is an explanatory diagram of a stirring mixer.

FIG. 6 is an explanatory diagram showing an example of a swirling mixer that mixes fuel gas and air.

FIG. 7 is a perspective explanatory view of a connecting burner according to a second embodiment of the burner device according to the present invention.

FIG. 8 is an explanatory view of another embodiment of the burner device in which the same flame nozzle zones are opposed to each other.

[Explanation of symbols]

 1 Burner Holding Stand 4,5 Burner 6 First Flame Port Zone 7 Second Flame Port Zone 8 First Flame Port Group 10 Second Flame Port Group

Claims (4)

[Claims] 1. A burner device comprising a plurality of flame nozzles, wherein a collecting portion of the flame nozzles has a first flame nozzle zone for ejecting a mixed gas having a high fuel gas ratio and a low fuel gas ratio. A burner device having a second flame nozzle zone for ejecting a mixed gas, wherein the first flame nozzle zone and the second flame nozzle zone are arranged adjacent to each other. 2. A first flame port group and a second flame port group, in which first flame port zones and second flame port zones are alternately arranged, respectively, and the first flame port group and the second flame port group are respectively provided. 2. The burner device according to claim 1, wherein the two flame nozzle groups are arranged to face each other in an upright shape. 3. The fuel gas ratio of the mixed gas ejected from the first flame nozzle zone and the mixed gas ejected from the second flame nozzle zone is adjusted and set in the range of 4: 6 to 3: 7. The burner device according to claim 1 or claim 2. 4. The burner device according to claim 2, wherein the facing angle between the first flame port group and the second flame port group is set within 0 to 160 degrees.