JPS599001B2 - Low NOx burner device - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a burner device.

In burner equipment, in addition to stabilizing the flame and completely burning the fuel, we also remove nitrogen oxides (N) contained in the exhaust gas to prevent pollution.
Is a small amount of Ox) required? .

An object of the present invention is to provide a low NOx burner device that can be applied to existing burner devices.

In order to reduce NOx generated in combustion gas, one of the important countermeasures is not to raise the flame temperature, and for this reason, methods such as lowering the combustion reaction rate and increasing the flame cooling area are recommended. It has been considered and implemented.

However, it does not require any major modification of the burner equipment, and NOx
There is a need for proposals for methods and devices that can reduce this.

This invention proposes a device structure that can be easily applied to existing burner devices, and embodiments thereof will be described below with reference to the drawings.

A burner device mounted on a furnace wall 1 has a fuel gas conduit 2 at its center, and a tube 3 at its axis for positioning an auxiliary heavy oil burner.

Further, an impeller 4 is attached to the tip of the conduit 2, which is formed by combining a plurality of trapezoidal cones formed of plates concentrically in an annular shape.

In addition, combustion air flows in from the air inlet (not shown) of the wind box 5, passes through the air register 6 that forms a swirling air flow inside the wind box, and flows into the burner throat 7 in a manner that envelops the flame. The fuel gas is discharged and mixed with the fuel gas which is rectified through the impeller 4 and jetted into the furnace, and the fuel gas is combusted.

In this case, the fuel gas is diffused into the furnace in a conical shape by passing through the impeller 4, but the concentration of fuel gas is on the outer periphery of the flame, which is created by the intersection of the flame and the virtual cross section perpendicular to the axis of the conduit 2. is almost uniform.

Flame formation results in a particularly high temperature at the flame center, which tends to generate nitric oxide (NO), which in turn increases the
O will change to NOx including harmful NO.

In order to improve this situation, at the tip of impeller 4,
A plurality of baffle plates 8 having a letter-shaped cross section, an impeller boss 9
A method has been proposed in which the flame is welded and attached to the flame and the flame is divided to prevent the generation of high temperature parts within the flame and to prevent the generation of NOx due to delayed combustion.

This invention further transforms such a ■-shaped baffle plate,
The present invention proposes a burner device that has a baffle plate that has a V-shape that looks like it has been pushed down, and that simultaneously divides the gas flow and gives the gas flow a swirl, resulting in less NOx generation and a short flame due to good combustion. be.

As shown in FIG. 4, the C-C cross section of the baffle plate 8 according to the present invention, which crosses the imaginary circle 10 centered on the burner axis in a plane that is in contact with and parallel to the burner axis, is a plane that includes the burner axis, as shown in FIG. On the other hand, the side plates 8a and sb have a V-shape pushed down to one side, that is, are inclined toward the same side (left side of 11-11 in FIG. 4) with respect to the cross section 11-11 including the burner axis.
It has the following.

The angle α formed by the side plate 8a with the 1 1-1 1 plane is smaller than the angle β formed by the side plate 8b with the 1 1-1 1 plane.

By having such a cross-sectional shape, the gas jet flow is caused to form a swirling flow by the baffle plates 8, 8'.

In addition, swirling allows other fuels with a large amount of unburnt content to be burned well, which is preferable from the viewpoint of short flame formation.

In a burner device in which a plurality of flame dividing baffles each having a substantially V-shaped cross section are attached to the furnace side end of the impeller with the opening of the V-shaped cross section facing the furnace side, the cross section of the baffle plate A surface 11 including the axis of the burner shaft of the V-shaped side plates 8a and 8b of
The low NOx burner device is characterized in that it is configured such that the slopes relative to the surface 11 are on the same side of the surface 11.

By implementing this invention, the burner flame becomes short even for fuels other than gas, which is favorable for boiler operation, NOx is reduced, and this baffle plate can be easily modified and installed on an existing burner impeller. Something,
It has various effects such as ease of handling.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a burner device according to an embodiment of the present invention, FIG. 2 is an enlarged view of section B in FIG. 1, and FIG. 3 is an enlarged view of section A in FIG.
-A view, and FIG. 4 is a C-C cross-sectional view of FIG. 3. 1... Furnace wall, 2... Conduit, 3...
...Pipe, 4 ... Impeller, 5 ... Wind box, 6 ... Air resist, 7 ... Burner throat, 8, 8'... ...Baffle board, 8a, 8b
...Side plate, 9...Boss, 10...
...Virtual circle.

Claims (1)

[Claims] 1. In a burner device in which a plurality of flame dividing baffles each having a substantially V-shaped cross section are attached to the furnace side end of the impeller with the opening of the V-shaped cross section facing the furnace side, the cross section of the baffle plate is provided. A low NOx burner device characterized in that the V-shaped side plates 8a and 8b are configured such that their inclinations with respect to a surface 11 including the axis of the burner shaft are on the same side of the surface 11.