JPS5926843B2 - Low NOx burner device - Google Patents

Description

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

In addition to flame stability and complete combustion of fuel, burner devices are required to have a low amount of nitrogen oxides (NOx) contained in exhaust gas to prevent pollution.

The 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. are being considered and implemented.

However, it does not require any major modifications to the burner device.
There is a need for proposals for methods and devices that can reduce Ox.

The present invention proposes a structure of a burner device that can be easily applied to an existing burner device, and an embodiment thereof will be described below with reference to the drawings in the case where a fuel canister gas is used.

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 and passes through an air register 6 that forms a swirling air flow.
The fuel gas is discharged from the burner throat 7 into the furnace in a manner surrounding the flame, is rectified through the impeller 4, and is similarly jetted into the furnace.The fuel gas is mixed and 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 the fuel gas is almost constant 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. As the flame becomes uniform and the center of the flame becomes particularly hot, nitrogen monoxide (NO) is likely to be generated.

will change to NOx.

In order to improve this situation, a flame splitting baffle member 8 consisting of a gutter-like body having a roughly V-shaped cross section is installed at the end of the impeller of the gas burner device on the furnace side, with an opening in the V-shaped cross section. The fuel conduit is installed so that its side faces into the furnace and its end face is located within the opening of the fuel conduit on the furnace side.

This flame splitting baffle member 8 has a 7-shaped opening facing the furnace side as shown in the 0-0 cross section of FIG. 2, and has an impeller 4.
On the other hand, in one embodiment, the two are fixed at opposite positions as shown in the figure.

This state is shown in FIG. 3, which is a front view of the impeller 4.

The area covered by this flame splitting baffle member 8, in other words, the angle α shown in FIG. 3 is approximately 45 degrees in one embodiment.

The number of flame splitting baffles and the area that blindly covers the impeller are determined experimentally depending on the composition of the fuel gas.

Since the flame splitting baffle member 8 has a square cross section, the gas flow is clearly split into divergent flames as shown in FIG. 4, thereby forming split flames.

On the other hand, since the flame splitting baffle member is a gutter-like body with a V-shaped cross section, the air flowing outside the conduit 2 can flow into the gutter, flow into the center of the flame, and cool the flame. It is effective.

In another embodiment, instead of the flame dividing baffle member 8 having the angle α shown in FIG.
The upper edge 10a of the figure 7 shape.

A flame splitting baffle member 8a having parallel flame dividing members 10b may be provided.

As explained above, the flame splitting baffle member 8 or 8a
As a result, the gas flow and, in turn, the flame is clearly divided, and more air can flow to the flame center from the flame dividing part and from the passage of the trough-like flame splitting baffle member, and the peak at the flame center can be The temperature is lowered, the gas flow in the circumferential direction of the flame becomes more concentrated in a virtual cross section perpendicular to the flame axis, the flame cooling area is increased, and the combustion itself is slowed down. This effect can significantly reduce the NOx content in the combustion exhaust gas.

In short, this invention provides a flame splitting baffle member consisting of a gutter-like body with a roughly V-shaped cross section at the tip of the fuel conduit of the burner device on the furnace side, so that the opening side of the V-shaped cross section faces into the furnace. A low N gas pipe disposed within the furnace side opening surface of the fuel conduit.
It is characterized by being an Ox burner device.

By carrying out this invention, the flame can be split, the center of the flame can be cooled,
It has various effects on reducing NOx, such as slowing down combustion and being able to be easily installed in existing burners.

BRIEF DESCRIPTION OF THE DRAWINGS: Fig. 1 is a vertical sectional view of a burner device according to 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. 2.
A main view, FIG. 4 is a 0-0 sectional view of FIG. 2, FIG. 5 is a front view of a baffle plate according to another embodiment corresponding to FIG. 3, and FIG. 6 is D of FIG. -D sectional view.

1...- Furnace wall, 2... Conduit, 3...
...Pipe, 4 ... Impeller, 5 ... Wind box, 6 ... Air register, 7 ... Burner throat, 8, 8a ... -Baffle member for flame division, 9...boss, 10a, 10b...upper edge of baffle plate.

Claims (1)

[Claims] 1. In a burner device consisting of a fuel conduit that guides fuel into the furnace, and a combustion air passageway that supplies combustion air into the furnace from the outside with this fuel conduit in the center, a cross section is provided at the furnace side tip of the fuel conduit. A flame splitting baffle member comprising a V-shaped gutter-like body, and a flame splitting baffle member disposed within the furnace-side opening surface of the fuel conduit so that the opening side of the V-shaped cross section faces into the furnace. NOx burner device.