JPH0619930Y2 - Low NOx burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is to connect an electric fan for supplying combustion air to a burner body, and to supply combustion gas in a combustion chamber of the burner body to an air intake passage of the electric fan. The present invention relates to a low NOx burner provided with a NOx reduction means provided with a combustion gas intake passage for supplying the NOx.

[Conventional technology]

Conventionally, in the NOx reduction means, an air intake passage of an electric fan in which a combustion gas intake passage is connected to a downstream side of a combustion gas heating region and an external pipe forming the combustion gas intake passage is arranged near the burner body. The flame temperature of the burner body is lowered by circulating the supply of combustion gas to suppress the generation of NOx.

[Problems to be solved by the device]

However, if an electric fan near the burner body is connected to the downstream side of the heating area, the external pipe for forming the combustion gas intake passage will generally have a long and greatly bent shape, which will increase equipment costs and construction costs for the external pipe. The burden was heavy and there was room for improvement.

By the way, as shown in FIG. 1, a water cooling jacket (7) surrounding the side of the combustion chamber (6) is provided, and in the vicinity of the outer peripheral portion of the burner body (1), there is an inlet side portion (13a) over the entire circumference thereof. , A combustion gas suction passage (13) consisting of an outlet side portion (13b) with a damper (14) connected to the air suction passage (8) of the electric fan (F) is formed, and the combustion gas suction passage (13) has an annular shape. By arranging the inlet (13c) in the vicinity of the burner main body, it is possible to avoid providing a long and complicated external pipe and to further cool the combustion gas by the action of the water cooling jacket (7). Has been.

However, in the above, since the inlet (13c) of the combustion gas intake passage (13) is located near the rear end of the water cooling jacket (7), the combustion gas intake passage (13) is provided by the water cooling jacket (7).
Since only the combustion gas sucked into the inlet (13c) of the fan cannot be selectively and efficiently cooled, the combustion gas supplied from the combustion gas intake passage (13) to the fan cannot be sufficiently cooled, and the NOx generation amount is suppressed. There was room for improvement.

An object of the present invention is to sufficiently cool the combustion gas supplied to the fan from the combustion gas intake passage while further reducing the NOx generation amount while making the combustion gas intake passage extremely simple.

[Means for Solving the Problems]

The feature of the present invention is that the burner body is connected to an electric fan for supplying combustion air, and the combustion gas suction passage for supplying the combustion gas in the combustion chamber of the burner body to the air suction passage of the electric fan is provided. In a low NOx burner provided with NOx conversion means, a water cooling jacket that surrounds the side of the combustion chamber is provided, and the combustion gas suction passage is positioned so that the inlet of the combustion gas suction passage is located near the tip of the water cooling jacket. The tubular flow path forming member for forming the above is provided on the inner side of the water cooling jacket, and the function and effect thereof are as follows.

[Action]

Due to the heat shielding effect of the flow path forming member, the water cooling jacket can be sufficiently suppressed from being heated by the combustion gas in the combustion chamber. Moreover, since the water cooling jacket can efficiently cool only the combustion gas sucked from the inlet of the combustion gas suction passage located near the tip of the water cooling jacket and flowing through the combustion gas suction passage, the fan can be cooled from the combustion gas suction passage. The combustion gas supplied to the can be sufficiently cooled, and the NOx generation amount can be further suppressed.

Further, since the combustion gas intake passage is formed only by providing the tubular flow passage forming member on the inner side of the water cooling jacket, the combustion gas intake passage can be made extremely simple in structure and is long and complicated as in the above-mentioned conventional technique. Compared with the installation of such external piping, the facility cost for circulating and supplying the combustion gas can be greatly reduced and the construction can be simplified.

[Effect of device]

As a result, it is possible to further reduce the amount of NOx generated, and it is also excellent in terms of cost and construction.
Burners can now be provided.

〔Example〕

 Next, FIG. 2 shows an embodiment.

Inside the burner body (1), the fuel supply path (2) with flow rate control valve (V)
Is provided with a nozzle (3) connected to, and a combustion air supply passage (4) is formed so that the air-fuel mixture is ejected from the flame port (5).

An electric fan (F) connected to the combustion air supply path (4), and
A water cooling jacket (7) surrounding the combustion chamber (6) is integrally attached to the burner body (1) to form a burner unit. A damper (10) is provided in the air intake passage (8) of the electric fan (F), and a water supply pipe (11) and a drain pipe (12) are connected to the water cooling jacket (7).

On the inner side of the water cooling jacket (7), a tubular flow path forming member (1
5) is provided to cover the entire circumference of the burner body (1) and the inlet side portion (13a) extending near the tip of the water cooling jacket (7), and the air intake passage of the electric fan (F) ( 8) A combustion gas intake passage (13) consisting of an outlet side portion (13b) with a damper (14) is formed, and an annular inlet (13c) of the combustion gas intake passage (13) is connected to a water cooling jacket (7). Place it near the tip of
The combustion gas is configured to be sucked in through the inlet (13c). Further, the combustion gas intake passage (1
3) The combustion gas flowing through is efficiently cooled by the water cooling jacket (7), and the sufficiently cooled combustion gas is driven by the electric fan (F).
The flame formed at the flame port (5) to a sufficiently low N
It is configured so that it can be stably maintained at a low temperature at which Ox can be achieved.

[Another embodiment]

 Next, another embodiment will be described.

The specific structure of the burner body (1) can be changed in various ways, and either a gas burner or an oil burner may be used, and an appropriate air-fuel mixing structure can be selected according to the fuel and combustion type.

The electric fan (F) may be placed separately from the burner body (1) and may be placed near the burner body (1), and may be connected by external piping.

The heating target of the low NOx burner does not matter, and can be applied to, for example, a boiler, a heating cooker, a heater, and various other devices.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a comparative example of the present invention. FIG. 2 is a conceptual diagram showing an embodiment of the present invention. (1) …… Burner body, (6) …… Combustion chamber, (7) …… Water cooling jacket, (8) …… Air intake passage, (13) …… Combustion gas intake passage, (13c) …… Inlet, (15) …… Flow path forming member, (F) …… Electric fan.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location F23D 14/68 14/78 A (72) Inventor Noriyasu Nishi 5: Hirano-cho, Higashi-ku, Osaka-shi, Osaka No. 1 Osaka Gas Co., Ltd. (56) References Japanese Patent Laid-Open No. 53-110128 (JP, A) No. 55-19934 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A burner body (1) is connected to an electric fan (F) for supplying combustion air, and combustion gas in a combustion chamber (6) of the burner body (1) is supplied to the air of the electric fan (F). A low NOx burner provided with a NOx reduction means having a combustion gas intake passage (13) for supplying to an intake passage (8), wherein a water cooling jacket (7) surrounding a side of the combustion chamber (6) is provided. ,
A tubular flow path forming member (15) forming the combustion gas intake passage (13) so that the inlet (13c) of the combustion gas intake passage (13) is located near the tip of the water cooling jacket (7). ) Is a low NOx burner provided on the inner side of the water cooling jacket (7).