JP2569979Y2 - Low NOx burner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner for swirling and burning air and fuel in a combustion cylinder.

[0002]

2. Description of the Related Art In a conventional burner, primary air and secondary air are injected from a parallel or oblique direction with respect to a fuel flow, and are mixed and burned. There is a problem that the amount of NOx needs to be increased and the amount of generated NOx increases. Therefore, it has a small hole for fuel spray on the nozzle side surface, the opposite surface is open, and the four side surfaces are arranged in a row parallel to the central axis of the combustion cylinder at a position close to one side of one corner. Provide a rectangular parallelepiped combustion cylinder inner cylinder provided with small holes at the same position on each surface, at the tip of the combustion cylinder,
A ring drawn in a square shape is provided, and fuel and air are swirled and mixed in the inner cylinder to burn, and the flame emitted from the inner cylinder is mixed with secondary air to perform efficient combustion (Japanese Patent Laid-Open No. Hei 2- 2
67407).

When the combustion air reaches the inner cylinder of the combustion cylinder having a rectangular parallelepiped shape, it flows along the periphery of the inner cylinder and reaches the ring at the tip of the outer cylinder of the combustion cylinder while sending air into the inner cylinder through an air hole in the side wall. The air that did not enter the inner cylinder from the air hole was allowed to flow as secondary air toward the flame along the combustion cylinder tip ring. A row of air holes is opened in the vicinity, and air is sent from the air hole into the inner cylinder, creating a pressure difference in the air flowing on the side wall, losing straightness, and causing The reached secondary air did not go straight toward the center of the flame, but flowed toward the periphery of the flame. Since the secondary air did not reach the high-temperature portion in the flame, it was difficult to lower the flame temperature, and the mixture of the flame and the secondary air was poor.

[0004]

The secondary air for combustion flows toward the center of the flame, crosses the flame at right angles, and disperses a local high-temperature region in the flame to reduce NOx.

[0005]

A straightening plate is provided so as to vertically contact three surfaces of the inner surface of the outer cylinder of the combustion cylinder, the side surface of the inner cylinder of the combustion cylinder, and the front end ring of the outer cylinder of the combustion cylinder.

[0006]

The combustion air flowing on the side surface of the inner cylinder of the combustion cylinder reaches the front end ring of the combustion cylinder by the flow straightening plate, and turns at a right angle as it flows toward the center of the flame. The secondary air reaches the vicinity of the center of the flame and generates turbulence in the flame, thereby preventing local high temperature in the flame and suppressing NOx generation. Furthermore, since the air is divided into the side with the air hole and the side without the air hole by the rectifying plate, all the air entering the side without the air hole becomes the secondary air, whereas the air entering the side with the air hole is Part of the air enters the inner cylinder through the air hole, so that the amount of secondary air is reduced, and the concentration of oxygen is generated depending on the location, and the effect of the concentration combustion is also obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.
One end of a cylindrical combustion cylinder outer cylinder (1) is connected to a combustion cylinder tip ring (9) which is drawn in a square shape, and the other end is connected to a blower (not shown). A rectangular parallelepiped combustion cylinder inner cylinder (2) is provided ahead of the spray nozzle (7) and the ignition device (3) on the tip side of the combustion cylinder. The spray nozzle (7) is connected to an oil pump (not shown) by an oil feed pipe (8), and fuel pressurized by the oil pump is sprayed by the spray nozzle.
The gas enters the combustion cylinder inner cylinder (6) through the spray hole (4) of the combustion cylinder inner cylinder. A flow straightening plate (10) is provided so as to be vertically in contact with three surfaces of the combustion cylinder outer cylinder, the combustion cylinder inner cylinder, and the combustion cylinder outer cylinder tip ring, and the combustion air sent from the blower flows along the flow straightener. Flows. The primary air for combustion flowing from the air hole (5) forms a swirling flow in the inner cylinder while intersecting with the combustion air from the air hole on the other surface, and intersects at a right angle with the flow suitable for the spray oil, and And rapid mixed combustion is performed. The secondary air that has not entered the air holes reaches the combustion cylinder tip ring perpendicularly by the flow straightening plate, turns at right angles, and flows toward the center of the flame emerging from the inner cylinder.

[0008]

[Effect of the Invention] By providing a rectifying plate and generating turbulence in the flame by the flow of the secondary air, it is possible to prevent the generation of a local high temperature region and reduce the generation of NOx generated at a high temperature. . In addition, there is also the effect of light-and-dark combustion, and low cost NO
An excellent burner with low x generation.

[0009]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 combustion cylinder outer cylinder 2 combustion cylinder inner cylinder 4 spray hole 5 air hole 6 combustion cylinder inner cylinder 8 oil feed pipe 9 combustion cylinder tip ring 10 rectifier plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A rectangular parallelepiped combustion cylinder inner cylinder is provided at a tip of a nozzle in a combustion cylinder outer cylinder, a fuel spray hole is provided on a nozzle side surface, and an opposite surface is opened to open the combustion cylinder. On each of the remaining four sides parallel to the central axis, a plurality of small holes are arranged in a row parallel to the central axis of the combustion cylinder close to one corner of the side face, and at the tip of the outer cylinder of the combustion cylinder In a burner with a combustion cylinder outer cylinder tip ring that is opened so that the inside is parallel to each side of the tip of the combustion cylinder inner cylinder, the combustion cylinder outer cylinder, the combustion cylinder inner cylinder, and the combustion cylinder outer cylinder tip ring A low NOx burner characterized in that a straightening plate is provided so as to be in contact with three surfaces perpendicularly.