JPH05141629A - Burner - Google Patents

Abstract

PURPOSE:To obtain a combustion device capable of carrying out perfect combustion and NOx reduction. CONSTITUTION:A burner main body 2 is provided with a burner port 3 on the top and a first mixed air chamber 4 inside. A large number of burner ports 5 are formed on a slanted portion 22 of a spray board 21. A second mixed chamber 6 is enveloped between each burner main body 2 and the spray board 21 and it is installed to a space on the downstream side of a mixed air flow passage 19. A first direction change section 23 is installed on the downstream side of an air intake section 9 and, moreover between each burner main body 2. A partitioning section 25 is installed between the second burner port 5 and the first direction change section 23. The second partitioning section 25 cuts off the second mixed air chamber 6 so that lean mixed air is erupted from the second burner port 5 and supplied to the upper part of the first burner port 3. The amount of combustion of thick fuel flames is minimized while the amount of combustion of lean fuel flames is increased. This construction makes it possible to embody perfect combustion based on thick and thin fuel combustion and reduce the generation of NOx as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device used for a gas water heater, a gas heater or the like.

[0002]

2. Description of the Related Art Conventionally, a combustion apparatus of this type has a structure as shown in FIG. The configuration will be described below with reference to the drawings. As shown in the figure, a plurality of burner main bodies 2 are housed inside a burner case 1, and the burner main body 2 has a first flame mouth portion 3 and a first air-fuel mixture chamber 4, A second flame mouth portion 5 and a second air-fuel mixture chamber 6 are provided on both sides of the air chamber 4. The first air-fuel mixture chamber 4 and the second air-fuel mixture chamber 6 are communicated with each other by the air-fuel mixture passage 7, and stabilize the flame base between the first flame mouth portion 3 and the second flame mouth portion 5. A flame holding plate 8 is provided. Also the burner body 2
An air intake portion 9 for setting the primary air ratio of the second air-fuel mixture chamber 6 is provided in the lower part of the space. Further, a nozzle 11 and an opening / closing valve 12 for switching the combustion amount are attached to the fuel pipe 10. A fan 13 is provided below the burner case 1.

In the above structure, a stable rich flame having a low oxygen concentration is formed on the first flame opening 3. On the other hand, a large amount of air from the air intake port 9 and the air-fuel mixture supplied from the air-fuel mixture passage 7 become a lean air-fuel mixture outside the flammability limit inside the second air-fuel mixture chamber 6, and are discharged from the second flame mouth portion 5. It flowed out and burned while being thermally affected by the rich flame in the first flame mouth portion 3 to form a lean flame having a high oxygen concentration. Then, the lean flame with low NOx concentration and unstable characteristics is stabilized by the rich flame,
As a whole, dark and light combustion was realized to reduce the generation of NOx. When reducing the combustion amount, the on-off valve 12
Is closed to stop the burner at the end.

[0004]

However, in the above-mentioned conventional configuration, when the combustion amount is reduced, combustion is performed at the second flame opening 5 between the burner that is burning and the burner that is not burning. The air-fuel mixture from the air-fuel mixture passage 7 of the burning burner mixes with the air in the air intake portion 9, and the lean air-fuel mixture is also emitted from the second flame port portion 5 of the unburned burner, and the presence of rich flame is present. There is a problem in that the gas is ejected onto the first flame mouth portion 3 of the burner at the end that does not come into contact with the rich flame, so that incomplete combustion occurs and CO and HC are generated.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a combustion device capable of preventing incomplete combustion and reducing NOx.

[0006]

In order to achieve the above object, the present invention provides a burner body having a first air-fuel mixture chamber communicating with a first flame opening, and the first mixture of the burner body. A second air-fuel mixture chamber having a second flame mouth portion provided on the side of the air chamber, and an air intake portion provided in the second air-fuel mixture chamber,
A first air-fuel mixture chamber which is provided in the burner body and which communicates with the first air-fuel mixture chamber and the second air-fuel mixture chamber, and which guides air from the air intake portion to an outlet of the air-fuel mixture passage And a partitioning part for partitioning the second air-fuel mixture chamber of the adjacent burner juxtaposed with the second air-fuel mixture chamber, and the partitioning part is provided from the first direction-changing part to the first It has a structure in which up to the second flame mouth portion is attached.

[0007]

In the above structure, the air from the air intake section is guided to the outlet of the air-fuel mixture passage by the first direction changing section and the jetted air-fuel mixture is forcibly mixed with the air, so that the air-fuel mixture is diluted sufficiently. The mixture becomes an air-fuel mixture, and the second air-fuel mixture chamber of the adjacent burner is blocked by the partition, so the lean air-fuel mixture is ejected from the second flame port and is formed above the first flame port. It is supplied to the rich flame and becomes a rich-burn combustion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, the same components as those shown in the above-mentioned conventional example will be described with the same reference numerals. As shown in the figure, a plurality of burner main bodies 2 are provided side by side in the burner case 1 to form a burner block. The burner body 2 is provided with a first flame mouth 3 having a large number of slits on the upper surface thereof, and a protrusion 14 is formed in the first air-fuel mixture chamber 4 in parallel with the flow direction of the air-fuel mixture. The portion 14 regulates the amount of air-fuel mixture to the first flame nozzle portion 3, has a first passage 15 therein, and has a sharp tip 16 and parallel to the flow direction of the air-fuel mixture. Introducing ports 18 are provided in the parallel part 17 along the longitudinal direction of the burner body 2 at optimum intervals. Further, both side surfaces of the burner body 2 are opened from the middle to form a horizontal portion, and the mixture passage 19 is provided in the horizontal portion. An end portion of the injection plate 21 is inserted into a groove formed by the support tool 20 and the burner main body 2, and adjacent burner main bodies 2 are joined and integrated. The injection plate 21 is formed by bending a flat plate into a mountain shape, and the inclined portion 22 is provided with a second flame port 5 having a large number of small holes. The second air-fuel mixture chamber 6 is surrounded by the space between the burner bodies 2 and the injection plate 21, and is provided in a space downstream of the air-fuel mixture passage 19. A V-shaped first direction changing portion 23 is provided downstream of the air intake portion 9 of the second air-fuel mixture chamber 6 and between each burner body 2. On the side surface of the burner body 2, a second direction changing portion 24 integrated with the support tool 20 is provided. A partition part 25 is provided between the second flame opening part 5 and the first direction changing part 23, and the partition part 25 is attached from the first direction changing part 23 to the second flame opening part 5. A throat portion 26 is formed on the upstream side of the burner body 2.

The operation of the above structure will be described. Combustion air is supplied from the fan 13 and part of the air is supplied to the throat section 2.
6 flows into the inside of the burner body 2 and most of the remaining air flows through the air intake portion 9 between the burner bodies 2, and the first direction changing portion 23 changes the approach direction above the outlet of the mixture passage 19. After being changed to, the traveling direction is further reversed by the second direction changing section 24, and the second mixture is supplied to each of the second air-fuel mixture chambers 6 blocked by the partition section 25. On the other hand, the fuel is supplied from the fuel pipe 10, ejected from each nozzle 11 toward each throat portion 26, flows into the inside of the burner body 2 to be mixed with air, and is supplied to the first air-fuel mixture chamber 4. . Here, the air-fuel mixture in the first air-fuel mixture chamber 4 has an upward flow, and most of the air-fuel mixture rises in the space between the burner body 2 and the projecting portion 14, and the air-fuel mixture passes through the air-fuel mixture passage 19 to the second position. The mixture is discharged to the air-fuel mixture chamber 6, and the rest is discharged from the first flame port portion 3 through the introduction port 18 perpendicular to the upward flow and the first passage 15. Therefore, the air-fuel mixture ejected from the air-fuel mixture passage 19 vertically intersects the air whose inlet direction has been changed above the outlet of the air-fuel mixture passage 19 by the first direction changing portion 23 and then collides violently with the air-fuel mixture, and then the traveling direction The second direction changing section 2
4 further promotes mixing by flowing in the opposite direction, and becomes a uniform lean air-fuel mixture and is supplied to the second air-fuel mixture chamber 6. The lean air-fuel mixture is shut off from the second air-fuel mixture chamber 6 of the adjacent burner by the partition part 25, and is supplied to the second flame port 5 of each burner. Also the inlet 18
Is provided parallel to the flow direction and vertically upstream of the mixture passage 19, it is possible to discharge a large amount of the mixture from the mixture passage 19 by utilizing the directionality of the upward flow of the mixture.

Next, the combustion action will be described. The air-fuel mixture in the first air-fuel mixture chamber 4 has a primary air ratio of 30 to 6
The air-fuel mixture is set to 0%, and a part of this air-fuel mixture blows out from the first flame mouth portion 3 to form a rich flame, and most of the remaining air-fuel mixture is introduced from the air-fuel mixture passage 19 into the second air-fuel mixture chamber 6. And is mixed with a large amount of air coming in between the burner main body 2. At this time, the primary air ratio is about 170 to 250%, and after becoming a lean air-fuel mixture outside the combustible range and being homogenized, the lean air-fuel mixture is discharged from the second flame port 5 provided in the inclined portion 22. It is jetted at an angle and is ignited by the thermal influence of the rich flame formed on the first flame mouth portion 3 to perform lean combustion. In general, the lower the temperature of the combustion reaction zone, the smaller the amount of thermal NOx generated, so the leaner the air-fuel mixture, the higher the heat capacity and the lower the flame temperature, and the more uniform the lean flame can be formed. Low NOx can be achieved.

As described above, in the combustion apparatus of the embodiment, when the combustion amount is reduced, when the number of burning burners is switched, the lean air-fuel mixture is divided by the partition section 25 into the second air-fuel mixture of the adjacent burners. By shutting off from the chamber 6, the rich flame is ejected from the second flame port 5 and supplied to the rich flame formed on the upper part of the first flame port 3, so the combustion amount of the rich flame is reduced and the lean flame is diluted. By increasing the combustion amount of the flame, the complete combustion can be realized by the rich and lean combustion, and the generation amount of NOx can be reduced.

[0012]

As is apparent from the above-described embodiments, the combustion apparatus of the present invention has a burner body having a first air-fuel mixture chamber communicating with the first flame mouth portion, and the first mixing of the burner body. A second air-fuel mixture chamber having a second flame mouth portion provided on the side of the air chamber, and an air intake portion provided in the second air-fuel mixture chamber,
A first air-fuel mixture chamber which is provided in the burner body and which communicates with the first air-fuel mixture chamber and the second air-fuel mixture chamber, and which guides air from the air intake portion to an outlet of the air-fuel mixture passage And a partitioning part for partitioning the second air-fuel mixture chamber of the adjacent burner juxtaposed with the second air-fuel mixture chamber, and the partitioning part is provided from the first direction-changing part to the first Even if the number of burners burning according to the load is switched, the combustion is completed in each burner unit by adopting this structure, even if the number of burners is changed.
Low NOx combustion can be achieved with complete combustion.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a combustion device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the main part of the device.

FIG. 3 is a sectional view of a main part of a conventional combustion device.

[Explanation of symbols]

 2 Burner body 3 1st flame mouth part 4 1st air-fuel mixture chamber 5 2nd flame mouth part 6 2nd air-fuel mixture chamber 9 Air intake part 19 Air-fuel mixture passage 23 1st direction change part 25 Partition part

Claims (1)

[Claims] 1. A burner body having a first air-fuel mixture chamber communicating with a first flame mouth portion, and a second flame mouth portion provided on a side portion of the first air-fuel mixture chamber of the burner body. A second air-fuel mixture chamber having, and an air intake portion provided in the second air-fuel mixture chamber,
A first air-fuel mixture chamber which is provided in the burner body and which communicates with the first air-fuel mixture chamber and the second air-fuel mixture chamber, and which guides air from the air intake portion to an outlet of the air-fuel mixture passage And a partitioning part for partitioning the second air-fuel mixture chamber of the adjacent burner juxtaposed with the second air-fuel mixture chamber, and the partitioning part is provided from the first direction-changing part to the first Combustion device attached up to the second flame port.