JP2756062B2 - Light-burn combustion burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the combustion of an air-fuel mixture having a low fuel gas concentration in close proximity to a rich combustion section for burning an air-fuel mixture having a high fuel gas concentration (an air-fuel mixture of fuel gas and combustion air). Regarding the lean burn burner which locates the light burn portion to be burned,
Specifically, a mixing chamber for mixing fuel gas blown and supplied from the rich combustion gas supply pipe into the suction port and combustion air sucked from the suction port along with the gas blowing is formed therein, and A plurality of flat burner bodies each having one end formed with a row of dense combustion flame outlets for blowing out the air-fuel mixture are disposed on the downstream side of the combustion air flow direction in the combustion air ventilation path. In a state in which the adjacent burn-out portions for rich combustion are used as the burn-out portion for light combustion, the air flow passage between the burners between the adjacent flat burner bodies is used for combustion. The present invention relates to a lean burn burner provided with a light burn gas supply pipe for supplying fuel gas from an upstream side in an air flow direction.

[0002]

2. Description of the Related Art Conventionally, in a lean-burn burner of the above type, as shown in FIG. 5 (see also FIG. 2), a suction port 3 in a flat burner body 1 and a fuel gas G1 corresponding thereto.
The gas supply pipes 2 for dense combustion are respectively arranged at positions corresponding to the center of the flat burner main body 1 in the longitudinal direction of the flame opening 4 for rich combustion in the flow direction of the combustion air A. In such a manner that the space between the dense combustion flame ports 4 adjacent in the juxtaposition direction of the flat burner main body 1 is a light combustion flame port 10,
Air flow path f between burners between adjacent flat burner bodies 1
The gas supply pipe 9 for light combustion, which supplies the fuel gas G2 from the upstream side in the flow direction of combustion air, is symmetrical in the longitudinal direction of the flame opening 4 for rich combustion with the central rich gas supply pipe 2 as the center. Were allocated to each of the various positions.

[0003]

However, when the type of fuel gas to be used is changed, the fuel gas G1 is supplied to the gas nozzle 2a attached to the gas supply pipe 2 for rich combustion, that is, to the suction port 3 of the flat burner main body 1. It is necessary to change the specification of the rich combustion gas nozzle that blows in. However, due to the configuration of this kind of burner, the direction of formation of combustion flame, the direction of supply of combustion air A,
In general, one side in the longitudinal direction of the rich combustion flame portion 4 is a maintenance side for the burner structure in relation to the direction in which the flat burner main bodies 1 are juxtaposed (that is, the maintenance direction is the right or left side in FIG. 5). Whereas
In the above-described conventional structure, the light combustion gas supply pipe 9 located adjacent to the rich combustion gas supply pipe 2 from one side in the longitudinal direction of the rich combustion flame opening 4 obstructs the operation. In the species change, although the light combustion gas supply pipe 9 itself does not require any maintenance such as replacement, it is necessary to disassemble and remove the light combustion gas supply pipe 9 and restore the assembly. However, there is a problem that it becomes complicated.

In order to solve this problem, a light combustion gas supply pipe 9 is located on each side of the rich combustion gas supply pipe 2.
Of these, one side closer to the maintenance side may be omitted, and the fuel gas for lean combustion supplied to the inter-burner air flow path f between the flat burner bodies 1 may be supplied only by the other lean combustion gas supply pipe 9. Thought, but in this case,
Since the supply position of the lean combustion fuel gas G2 to the inter-burner air flow path f is deviated to one side in the longitudinal direction of the rich combustion flame port 4, the lean combustion flame port between the rich combustion flame ports 4 is provided. The combustion state in the portion 10 becomes non-uniform in the longitudinal direction of the flame port portion, resulting in a decrease in overall flammability.

An object of the present invention is to make it possible to easily perform maintenance on a rich combustion gas supply pipe while maintaining high flammability by rational arrangement improvement.

[0006]

According to the present invention, there is provided a rich-burn combustion burner characterized in that fuel gas blown and supplied from a gas supply pipe for rich combustion to a suction port, and the fuel gas is sucked from the suction port with the blowing of the gas. A plurality of flat burner bodies, each having a mixing chamber for mixing the combustion air therein, and a row of dense combustion flame ports formed at one end edge for blowing the air-fuel mixture, are provided with a ventilation path for the combustion air. In the rich combustion flame port is juxtaposed in a state facing the downstream side of the combustion air flow direction,
In the state in which the space between the adjacent rich combustion flame ports is used as the light combustion flame port, from the upstream side in the combustion air flow direction with respect to the burner air flow path between the adjacent flat burner bodies. In a configuration in which a gas supply pipe for light combustion for supplying fuel gas is provided, in a flow direction of combustion air, at a position corresponding to the center of the flat burner main body in the longitudinal direction of the flame port for rich combustion, or The light-burning gas supply pipes are arranged at respective positions symmetrical in the longitudinal direction of the rich-burning flame port with respect to the center-equivalent position, and the suction is performed on the light-burning gas supply pipes. The mouth and the gas supply pipe for rich combustion are arranged at positions deviated to one side in the longitudinal direction of the flame port for rich combustion, and the operation and effect are as follows.

[0007]

In other words, in the above-described characteristic configuration (see FIGS. 1 and 2), the rich combustion gas supply pipe 2 is connected to the light combustion gas supply pipe 9 by the rich combustion flame port 4. By arranging it at a position deviated to one side in the longitudinal direction, in a mode in which one side in the longitudinal direction of the rich combustion flame opening 4 is used as a maintenance side for the burner structure, supply of rich combustion gas from the maintenance side is performed. When performing maintenance on the pipe 2, it is possible to prevent the light supply gas supply pipe 9 from hindering.

The light combustion gas supply pipe 9 for supplying the light combustion fuel gas G2 to the inter-burner air flow path f between the flat burner main bodies 1 is located in the longitudinal direction of the rich combustion flame opening 4. Since the burner is disposed at a position corresponding to the center of the flat burner main body 1 or at a position symmetrical with respect to the center corresponding to the center in the longitudinal direction of the rich combustion flame opening portion 4, the burners between the flat burner main bodies 1 are disposed. The mixture of the fuel gas G2 and the combustion air A in the air flow path f (that is, the generation of a lean combustion air-fuel mixture to be burned in the light combustion flame 10 between the rich combustion flames 4) is generated by flame. The inlet 3 of the flat burner main body 1 and the rich-burning gas supply pipe 2 are arranged at one side in the longitudinal direction of the rich-burning flame outlet 4 in the longitudinal direction of the burner. For rich combustion blown out from the flame outlet 4 Regarding the generation of aiki (ie, mixing of the fuel gas G1 blown into the suction port 3 and the combustion air A sucked from the suction port 3 accordingly), the mixing chamber 5 exclusively formed inside the flat burner main body 1 Can be kept uniform in the longitudinal direction of the flame opening.

[0009]

As described above, according to the characteristic structure of the present invention, the combustion state of each of the rich combustion flame port and the light combustion flame port is made uniform in the longitudinal direction of the flame port. While maintaining high flammability as a whole, it is possible to easily perform maintenance on the gas supply pipe for rich combustion necessary for changing the gas type and the like.

Further, in a mode in which the lean combustion gas supply pipe is arranged at a position corresponding to the center of the flat burner main body in the longitudinal direction of the rich combustion flame port, conventionally, the lean combustion gas supply pipe is distributed to both sides of the rich combustion gas supply pipe. While a plurality of light-burning gas supply pipes were required, the light-burning gas supply pipes were connected while maintaining the combustion state at the light-burning flame port uniformly in the longitudinal direction of the flame port as described above. This makes it possible to simplify the structure, facilitate manufacture, reduce the weight of the burner unit, and reduce the cost of the apparatus.

[0011]

Next, an embodiment will be described.

In FIG. 1 to FIG. 3, reference numeral 1 denotes a flat burner main body formed by press working, and an intake port through which fuel air is blown from an attached gas nozzle 2a in a rich combustion gas supply pipe 2 to suck combustion air A. The fuel gas G1 blown into the suction port 3 is formed in the lower end, and the row of rich combustion ports 4 having a large number of small flame ports 4a is formed at the upper edge. And the intake air A from the intake port 3 to form a mixing chamber 5 for ejecting the mixture (rich combustion mixture) from the rich combustion flame port 4 at the upper end.

As an internal structure of the instantaneous water heater, reference numeral 6 denotes an air supply chamber for receiving air supply from a fan 7, and the flat burner main body 1 has a ventilation path for combustion air A flowing upward from the air supply chamber 6. , Each of the rich combustion flame ports 4 is directed upward (that is, downstream of the combustion air flow direction).
A plurality of them are juxtaposed at equal intervals in a parallel posture.

Reference numeral 8 denotes a heat exchanger for heating water, which is disposed in a combustion gas path from a group of burners juxtaposed.

The lower part 9 of the inter-burner air flow path f formed between the adjacent flat burner main bodies 1 is blown from the attached gas nozzle 9a to the lower side of the inter-burner air flow path f (that is, the combustion air). A light-burning gas supply pipe for supplying the fuel gas G2 from the upstream side in the flow direction). A light-burning flame port 10 is provided between adjacent dense-burning flame ports 4 to form a light-burning flame port 10. An air-fuel mixture (light-air mixture) of the fuel gas G2 supplied from the light-combustion gas supply pipe 9 and the passing combustion air A in the inter-burner air flow path f is supplied to the flame port 10.

That is, in the above configuration, in each inter-burner air passage f, the rich combustion mixture generated in the internal mixing chamber 5 of each flat burner main body 1 is used as the lean combustion mixture supplied to the lean combustion flame port 10. An air-fuel mixture having a lower fuel gas concentration than the air-fuel mixture is generated as a lean-burn air-fuel mixture, so that the air-fuel mixture having a high fuel gas concentration is burned in each of the rich-burning flame outlets 4. The lean burn is performed in which the mixture having a low fuel gas concentration is burned in the lean burn flame 10 in close proximity to each of the rich burns in the rich burn flame 4 to reduce NOx and increase the load combustion. And balance.

As each of the gas supply pipe 2 for rich combustion and the gas supply pipe 9 for light combustion extend in a parallel state in the juxtaposition direction of the flat burner main body 1, the air for combustion passing through each air passage f between the burners is provided. A light combustion gas supply pipe 9 for mixing the fuel gas G2 with A is disposed at a position corresponding to the center of the flat burner main body 1 in the longitudinal direction of the flame opening when viewed in the flow direction of the combustion air A,
Thereby, while the number of the light combustion gas supply pipes 9 is one, the structure is simplified and the air flow path f between the burners is reduced.
During the mixing in the passing process, a light-burning air-fuel mixture as uniform as possible in the longitudinal direction of the light-burning flame port 10 is obtained.

On the other hand, in this type of rich / lean combustion, the attached gas nozzle 2a of the rich combustion gas supply pipe 2 requires a finer specification exchange in changing the gas type and the like as compared with the attached gas nozzle 9a of the light combustion gas supply pipe 9. However, in such maintenance such as nozzle replacement, one side in the longitudinal direction of the flame port portion is the maintenance side, and the direction indicated by the arrow M in the drawing is the maintenance direction, whereas The gas supply pipe 2 is disposed at a position deviated to one side closer to the maintenance side from a position corresponding to the center of the flat burner main body 1, which is an arrangement portion of the light combustion gas supply pipe 9 in the longitudinal direction of the flame outlet. And the gas supply pipe 2 for rich combustion
In accordance with the uneven arrangement of the flat burner main body 1, the inlet 3 of each flat burner main body 1 is also formed at a position deviated from the position corresponding to the center of the flat burner main body 1 to one side closer to the maintenance side due to the structure of the flat burner main body 1. It is.

In other words, due to the biased arrangement of the rich combustion gas supply pipe 2, maintenance on the rich combustion gas supply pipe 2 such as replacing the attached nozzle 2a of the rich combustion gas supply pipe 2 in response to a change in the type of gas used. In the above, the required maintenance can be easily performed on the rich combustion gas supply pipe 2 without hindering the light combustion gas supply pipe 9.

Reference numeral V denotes a switching valve for opening and closing the fuel gas supply passage to the lean combustion gas supply pipe 9. When the load is small and a high excess air ratio is required, the switching valve V must be closed. As a result, the combustion in the rich combustion flame port 4 can be performed in a form in which the combustion in the light combustion flame port 10 is stopped and the light combustion flame port 10 is used as an outlet for the secondary air for combustion. It is like that.

[Another Embodiment] Next, another embodiment will be described.

The gas supply pipe 2 for rich combustion and the suction port 3 of the flat burner main body 1 are placed on one side closer to the maintenance side in the longitudinal direction of the flame port with respect to the arrangement of the gas supply pipe 9 for light combustion. At the time of disposition, as shown in FIG.
The fuel gas blowing direction from the attached gas nozzle 2a to the suction port 3 in the rich combustion gas supply pipe 2 is set to the direction along the longitudinal direction of the flame opening, and the rich combustion gas supply pipe 2, and
A configuration in which the suction port 3 is arranged on the side of the flat burner main body 1 may be adopted.

Further, instead of arranging the lean burn gas supply pipe 9 at a position corresponding to the center of the flat burner main body 1 in the longitudinal direction of the flame port as described above, or in combination with the center arrangement, a chain line in FIG. As shown by, the positions corresponding to the center may be arranged symmetrically in the longitudinal direction of the flame opening with respect to the center.

The burn-in-concentration burner according to the present invention can be used for various purposes, including installation in water heaters and heaters.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment.

FIG. 2 is a side view showing the embodiment.

FIG. 3 is a plan view showing an embodiment.

FIG. 4 is a front view showing another embodiment.

FIG. 5 is a front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat burner main body 2 Rich combustion gas supply pipe 3 Suction port 4 Rich combustion flame port 5 Mixing chamber 9 Light combustion gas supply pipe 10 Light combustion flame port A Combustion air G1, G2 Fuel gas

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 56-85128 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F23D 14/00-14/18 F23D 14 / 26-14/84 F23C 11/00 329

Claims (1)

(57) [Claims] 1. A fuel gas (G1) blown and supplied from a gas supply pipe (2) for rich combustion to a suction port (3), and combustion air sucked from the suction port (3) as the gas is blown. A flat burner main body (1) having a mixing chamber (5) for mixing with (A) formed therein, and a row of rich combustion flame openings (4) for blowing out the mixture at one end. A plurality of fuel burner ports (4) are juxtaposed in the ventilation path of the combustion air (A) such that the rich burn flame outlets (4) face the downstream side in the flow direction of combustion air. In the state in which the flame openings (10) for light combustion are provided between the flat burner bodies (1), the burner air flow path (f) between the adjacent flat burner bodies (1) is upstream in the combustion air flow direction. And a lean burn burner provided with a lean burn gas supply pipe (9) for supplying fuel gas (G2) from When viewed in the flow direction of the combustion air (A), at a position corresponding to the center of the flat burner main body (1) in the longitudinal direction of the burner port for rich combustion (4), or at the position corresponding to the center. The light-burning gas supply pipes (9) are arranged at symmetrical positions in the longitudinal direction of the rich-burning flame port (4), respectively. A rich-burn combustion burner in which the intake port (3) and the rich-burn gas supply pipe (2) are arranged at positions deviated to one side in the longitudinal direction of the rich-burn flame port (4).