JP3136201B2 - Premixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a premixing device for mixing fuel gas and air and supplying the mixture to a burner.

[0002]

2. Description of the Related Art FIG. 7 shows a general burner device used for a combustion device such as a water heater or a bath kettle. This type of burner device has a plurality of burners 1 arranged side by side. Each burner 1 includes a gas introduction unit 2 and a premixing unit 3.
A gas nozzle 6 is disposed in the gas inlet 2 so as to face the gas inlet 5 of the burner 1.
The air supplied from a fan or the like (not shown) is taken in by the ejector action of the fuel gas ejected from the gas nozzle 6 into the gas inlet 5, and the taken-in fuel gas and air are diffused in the premixing unit 3. The premixed gas is produced by mixing, and the mixed gas is ejected from a plurality of flame ports 7 of the flame port forming section 4 into a combustion chamber to perform combustion.

[0003]

However, in the conventional burner apparatus, the fuel gas is taken in from the gas nozzle 6 for each burner 1, and the fuel gas is independently mixed for each burner 1 in the premixing section 3 for premixing. Because it is a method of producing gas,
Due to variations in the flow of air supplied from the fan, etc., the concentration of the premixed gas, the ejection speed, and the like vary for each burner 1, causing uneven combustion. There was a difficulty that the concentration and the like had to be adjusted.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a premixing device which has almost no variation in gas concentration and the like and can easily adjust the gas concentration. It is in.

[0005]

The present invention is configured as follows to achieve the above object. That is, in the premixing device of the present invention, two or more premixing chambers for forming premixed gases having different gas concentrations are formed by partitioning the inside of the case by partition walls, and a fuel side is provided at an inlet side of each premixing chamber. An inlet for taking in gas and air together is provided, and a plurality of gas outlets for feeding the premixed gas to a plurality of burners corresponding to the gas concentration of the created premixed gas are provided on the outlet side of each chamber. In addition, the inlet of each of the premixing chambers is provided with a swirl mixer that mixes the fuel gas and the air by swirling the air. Have been.

[0006]

In the present invention having the above-described structure, when fuel gas and air are introduced from the inlet of each premixing chamber, the fuel gas and air are diffused and mixed while passing through the premixing chamber to form a uniform premixed gas. Is produced, and the premixed gas is supplied from a plurality of gas outlets to a corresponding burner.

By injecting a different amount of fuel gas into each inlet of each of the premixing chambers, the gas concentration of the premixed gas produced in each of the premixing chambers is different, and burner combustion with a mixed gas having a high fuel gas concentration is performed. Burner combustion with a mixed gas having a low fuel gas concentration is performed in various modes according to the arrangement of the burners.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a premixing device according to the present invention. In the figure, the inside of a box-shaped case 8 is partitioned by a partition 10 into a first premixing chamber 11 and a second premixing chamber 12.
And each of the premixing chambers 11 and 12 has an introduction passage 1
3 and 14 are protruded below the case 8 and each of the introduction passages 1
Gas inlet means 16 for the fuel gas is provided at the inlets 15 of 3 and 14.

As shown in FIG. 1A, for example, the gas introduction means 16 has a gas nozzle 6 disposed opposite to the introduction port 15, and a stirring mixer between the gas nozzle 6 and the introduction port 15. 17 can be configured.
As shown in FIG. 2, the stirring mixer 17 is provided with introduction passages 13 and 14.
A plurality of agitating blades 40 are arranged obliquely around the inlet side of the container. In the case of this gas introduction means 16, the fuel gas ejected from the gas nozzle 6 is mixed with the stirring mixer 17.
Thus, the fuel gas and the air are diffused and mixed into the introduction passages 13 and 12 while passing through the respective premixing chambers 11 and 12, thereby producing a premixed gas having a uniform concentration.

Further, as another configuration of the gas introduction means 16,
As shown in FIG. 1B, a configuration in which a swirl mixer 18 is provided at the inlet 15 may be employed. As shown in FIG. 3, the swirl mixer 18 is provided with a baffle plate 21 at the tip end of the fuel supply pipe 20, and a plurality of gas ejection holes 22 provided on the outer periphery of the fuel supply pipe 20 immediately below the baffle plate 21. A swirler (swing guide blade) 23 is arranged around the gas ejection hole 22, and the air sent from the fan 9 is swirled along the swirler 23, and the swirling air is radiated from the gas ejection hole 22. The fuel gas to be injected is collided with the fuel gas from a right angle direction to be stirred and mixed.
The fuel gas is fed into the premixing chambers 3 and 14, and the fuel gas and the air are mixed uniformly while passing through the premixing chambers 11 and 12, respectively.

A plurality of gas outlets 24a and 24b are arranged on the outlet side of the premixing chambers 11 and 12, and a gas outlet 24a of the first premixing chamber 11 is provided with a gas having a high fuel gas concentration. A plurality of first burners 25 for burning the mixed gas are connected,
A plurality of second burners 26 for burning a premixed gas having a low fuel gas concentration are connected to a gas outlet 24b of the premixing chamber 12, and a row of burners 25, 26 is attached to the case 8.

In this embodiment, the ratio of the amount of gas supplied to the inlet 15 on the introduction passage 13 to the amount of gas supplied to the inlet 15 on the introduction passage 14 is 4: 6 to 3: 7. And a large amount of fuel gas is supplied to the introduction passage 14 side. On the side of the introduction passage 13 to which a small amount of gas is supplied, the amount of air mixed with the gas is set to 0.3 to 0.4 times the theoretical amount of air, so that the first premixing chamber 11 produces a high concentration premixed gas. I have to. In addition, the inlet 15 on the inlet passage 14 side has a pressure of 1.6 to
A large amount of premixed gas having a low concentration is produced in the second premixing chamber 12 by introducing 1.7 times the amount of air, and the first burner 25 connected to the first premixing chamber 11 is formed. The combustion of the mixed gas having a high gas concentration is performed by the second premixing chamber 12.
The second burner 26 is connected to the second burner 26 so that the mixed gas having a low gas concentration is burned.

According to this embodiment, a high-concentration uniform premix gas is produced in the first premix chamber 11, and the premix gas is distributed and supplied to each first burner 25. There is no variation in the gas concentration and the like burned in each first burner 25, and uniform and stable combustion can be achieved for each burner 25. Similarly, a uniform low concentration premixed gas is created in the second premixing chamber 12 and the uniform premixed gas is applied to each second premixed gas.
Are distributed and supplied to the burners 26 of the second burner 26, so that there is no variation in combustion for each of the second burners 26, and stable combustion can be obtained.

When the combustion state of each of the first burners 25 is controlled to be changed, the fuel gas or air amount may be adjusted at one point of the inlet 15 on the side of the inlet passage 13. The introduction passage 14 is also used when the combustion state of the burner 26 is variably adjusted.
It is only necessary to adjust and control the gas supply amount and the air amount at one position of the inlet 15 on the side, so that the combustion control becomes very easy,
Fine control of combustion becomes possible.

Further, the first burner 25 burns a high-concentration premixed gas, and the second burner 26 burns a low-concentration premixed gas. Since the volume of the mixed gas is much larger, it is possible to create a combustion state that covers a high-temperature flame with a high fuel gas concentration over a wide range with a low-temperature flame with a low fuel gas concentration. As can be seen, a low-temperature combustion state is established, whereby clean combustion with extremely low generation of nitrogen oxides can be performed.

FIG. 4 shows a second embodiment of the present invention. In the premixing device of this embodiment, similarly to the first embodiment, the inside of the case 8 is divided by a partition 10 into a first premixing chamber 11 and a second premixing chamber 12, and each premixing chamber is separated. Mixing room 1
Gas introduction means 16 is provided on the inlet side of 1 and 12.

The gas introducing means 16 is provided with a fan 9 facing the inlets of the premixing chambers 11 and 12, and stirring chambers 36 and 37 are provided between the fan 9 and the premixing chambers 11 and 12. The gas supply pipes 20a, 20b are connected to the stirring chambers 36, 37, and a plurality of stirring blades 29 are arranged in the chambers of the stirring chambers 36, 37 in different circumferential directions. The fuel gas radially ejected from the gas supply pipe 20a is stirred and mixed with the air supplied from the fan 9 in the stirring chamber 36 to form a high-concentration mixed gas and sent to the first premixed gas chamber 11. . Similarly, the fuel gas supplied from the gas supply pipe 20b is mixed with the air of the fan 9 in the stirring chamber 37, and is sent to the second premixing chamber 12 as a low-concentration mixed gas.

A gas delivery section 2 is provided above the premixing chambers 11 and 12.
Gas outlets 24a and 24b are provided outwardly at the gas delivery portions 27 and 28, respectively. In this way, the gas delivery portions 27 and 28 are formed upright from the respective premixing chambers 11 and 12, and the gas delivery ports 24 are directed outward from the respective gas delivery portions 27 and 28.
By forming a and 24b, it becomes suitable for connection of the connection burner 30 having a specific form.

The connecting burner 30 integrally connects a first burner 25 for burning a premixed gas having a high gas concentration and a second burner 26 for burning a premixed gas having a low gas concentration via a connecting portion 31. Then, a pair of combustion surfaces, each of which includes the first burner 25 and the second burner 26 as a pair, have a flat structure, and are formed on the side facing the inlet side of the first burner 25 and the inlet side of the second burner 26. By connecting the inlet side of the first burner 25 to the gas outlet 24a of the gas delivery unit 27 and connecting the inlet side of the second burner 26 to the gas outlet 24b of the gas delivery unit 28. ,
The connection burner 30 is attached to the case 8 via the gas delivery units 27 and 28, and the burner row of the plurality of connection burners 30 is
Is formed on the upper side.

In this embodiment, similarly to the first embodiment, the premixed gas in which the fuel gas and the air are uniformly mixed in each of the premixing chambers 11 and 12 is distributed and supplied to the corresponding burners 25 and 26. By doing so, it is possible to prevent the variation in the combustion of each burner 25, 26, and to achieve the same effect as in the first embodiment that the control of the combustion state of each burner 25, 26 becomes easy. it can.

FIG. 5 shows a third embodiment of the present invention. This embodiment uses a first burner 25 as shown in FIG.
And a premixing device having a structure suitable for mounting a connecting burner 34 in which the flame forming surfaces 32, 33 of the second burner 26 are opposed to each other in a V-shape. The premixing device of this embodiment also
The inside of the case 8 is partitioned by a partition wall 10 to form a first premixing chamber 11 and a second premixing chamber 12. As in the first embodiment, a gas introducing means 16 of a stirring mixer 17 type or a swirling mixer 18 type is provided. On the upper end side of the case 8, a pair of a gas outlet 24a leading to the first premixing chamber 11 and a gas outlet 24b leading to the second premixing chamber 12 is provided on the left and right sides. In the direction, the gas outlets 24a on the first premixing chamber 11 side and the gas outlets 24b on the second premixing chamber 12 side are alternately formed, and the gas outlets 24a of each pair of the case 8 are formed. , 24b, the connecting burner 30 is attached to
Of the burners 25 and the second burners 26 constitute a burner row alternately arranged in the longitudinal direction.

This embodiment also employs a method of distributing and supplying the uniform premixed gas produced in each of the premixing chambers 11 and 12 to the corresponding burners 25 and 26, thereby preventing combustion variations and controlling combustion. An easy premixing device can be provided.

Further, the premixing device of this embodiment is provided with a connecting burner 30 in which the flame forming surfaces 32 and 33 face each other in a V-shape, so that the V-shaped flame forming surfaces 32 and 33 are provided. A negative pressure zone is formed in the central region of the burners 25 and 26 by the flow of the premixed gas along the flow path, and a flow of exhaust gas recirculation is drawn downward toward the negative pressure zone side to generate downward flow. Thus, clean combustion with less generation of nitrogen oxides can be achieved.

It should be noted that the present invention is not limited to the above embodiments, but can take various forms. For example, in each of the above embodiments, one pre-mixing chamber 11
Although fuel gas and air are introduced into each of the premixing chambers 11 and 12 from one inlet 15, a plurality of introduction passages 13 and 14 are provided in each of the premixing chambers 11 and 12. The gas introduction means 16 is provided on the side of the introduction port 15 of each of the introduction passages 13 and 14, and the fuel gas and the air are introduced from the plurality of introduction ports 15 into the corresponding premixing chambers 11 and 12, respectively. Good. Also in this case, the fuel gas and air introduced from the plurality of inlets are uniformly mixed in each of the premixing chambers 11 and 12, and the first premixing chamber 11
In the second premixing chamber 12, premixed gases having different gas concentrations and uniform concentrations are produced and distributed to the corresponding burners.

In each of the above embodiments, the inside of the case 8 is the first.
Was divided into two chambers, ie, a premixing chamber 11 and a second premixing chamber 12, but this was divided into three or more chambers, and premixed gases having different concentrations were produced and supplied to the corresponding burners. Is also good.

[0026]

According to the present invention, the interior of the premixing device case is divided into two or more chambers, and a uniform premixed gas having a predetermined concentration is produced in each of the divided premixing chambers. Since uniform premixed gas can be distributed and supplied to a plurality of burners connected to the mixing chamber, there is no variation in combustion balance among the burners connected to each premixing chamber, and a good combustion state can be obtained. it can.

When the combustion state is variably controlled,
There is no need to variably control the mixing ratio of gas and air for each burner as in the prior art, and it is sufficient to control the gas concentration and the like at the inlet on the inlet side of each premixing chamber. Variable control is also very easy, handling is easy,
A premixing apparatus having good combustion stability and a simple configuration can be provided at low cost.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram illustrating an example of a stirring mixer as a gas introduction unit.

FIG. 3 is an explanatory diagram showing an example of a swirl mixer as a gas introduction means.

FIG. 4 is an explanatory diagram of a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of a connection burner that can be attached to the premixing device of the embodiment.

FIG. 7 is an explanatory view of a conventional general burner device.

[Explanation of symbols]

 8 Case 10 Partition wall 11 First premixing chamber 12 Second premixing chamber 15 Inlet 16 Gas introduction means 18 Swirling mixer 24a, 24b Gas outlet 25 First burner 26 Second burner

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-61-161323 (JP, A) JP-A 49-83361 (JP, U) JP-A 63-142527 (JP, U) JP-A 58-83 42524 (JP, U) Fully open 1983-77444 (JP, U) Fully open 1983-37016 (JP, U) Fully open 1986-154422 (JP, U) Fully open, 62-160133 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) F23D 14/02-14/08 F23D 14/62 F23C 11/00 329-330

Claims (2)

(57) [Claims] An interior of a case is divided by a partition to form two or more premixing chambers for producing premixed gases having different gas concentrations, and a fuel gas and air are put together at an inlet side of each premixing chamber. A premixing device provided with an inlet for taking in the premixed gas, and a plurality of gas outlets for feeding the premixed gas to a plurality of burners corresponding to the gas concentration of the produced premixed gas on the outlet side of each chamber. 2. The premixing device according to claim 1, wherein a swirl mixer for mixing the fuel gas and the air by swirling the air is provided at an inlet of each premixing chamber.