JPH05118512A - Low nitrogen oxide generation burner - Google Patents

Abstract

PURPOSE:To reduce the generation of NOx by a method wherein subdivision combustion and thick-and-thin fuel combustion are executed in a burner. CONSTITUTION:A combustion chamber 1 is composed of a diverging inclination flame stabilizing plate 2. Blank parts 3 and slit-form openings 5 communicating to a gas chamber 4 are alternately formed in the inclination flame stabilizing plate 2. A gas guide plate 7 is installed on the air chamber 6 side of the blank part 3 and a lateral gas outflow hole 8 communicating to the gas chamber 4 is formed in the lower end part of the gas guide plate 7 and a vertical gas outflow hole 9 communicating to the gas chamber 4 is formed in the lower end part on the combustion chamber 1 side of the blank part 3. This constitution delicately executes subdivision combustion and thick-and-thin fuel combustion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nitrogen oxide low generation burner used for, for example, a boiler.

[0002]

2. Description of the Related Art As this type of burner, there is a burner shown in FIG. This is because a slit hole b is formed in the flame holding plate a, and air is jetted from the slit hole b, while the air-fuel mixture is jetted between the slit holes b and mixed and burned along the flame holding plate a to hold the flame. The flame c attached to the plate a is formed.

[0003]

The conventional burner described above is not uniform when the air and the air-fuel mixture are mixed and burned, and a high temperature portion is partially formed everywhere, and nitrogen oxides are generated. Can not be suppressed. An object of the present invention is to solve such a point.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a combustion chamber composed of a diverging inclined flame holding plate, and the inclined flame holding plate has a blind portion and a gas chamber. Slit-like openings that communicate with each other are alternately configured, a gas guide plate is installed on the air chamber side of the blind portion, and a lower end portion of the gas guide plate is
A horizontal gas outflow hole communicating with the gas chamber is formed, and a vertical gas outflow hole communicating with the gas chamber is formed at a lower end portion of the blind portion on the combustion chamber side. Is
In the above-mentioned configuration, the lateral gas outflow holes and the vertical gas outflow holes are alternately formed on the air chamber side and the combustion chamber side, and in the present invention, the combustion chamber shape is inclined. It is a box-shaped structure with flame holding plates facing each other.
According to the present invention, the combustion chamber is formed into a cylindrical shape with an inclined flame holding plate. Further, the present invention is configured such that the longitudinal gas outflow holes are inclined toward the inclined flame stabilizing plate, and
According to the present invention, a guide member for guiding the gas flowing out from the vertical gas outflow hole along the inclined flame stabilizing plate is provided in the combustion chamber. In the present invention, the gas chamber also includes the concept of the air-fuel mixture chamber for convenience.

[0005]

When the gas flows out from the lateral gas outflow hole, the gas rises and mixes with the ambient air, but flows out from the slit-shaped opening into the combustion chamber. At this time, at the same time, the gas flows out from the vertical gas outflow hole and rises along the blind portion, and this gas mixes well with the air-fuel mixture flowing out from the slit-shaped opening. Since the combustion is executed in such a state, a good flame attached to the inclined flame holding portion is formed. Combustion burns while being subdivided in this way, and in combination with the fact that no special high temperature portion is formed, lean combustion progresses in the vicinity of the slit-shaped opening, and on the blind portion, Gas rich combustion proceeds. NOx generation can be effectively suppressed by the simultaneous progress of the rich-lean combustion and the subdivided combustion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes a combustion chamber, which is composed of an inclined flame holding plate 2, and the inclined flame holding plate 2 has a slit-shaped opening 5 communicating with a blind portion 3 and a gas chamber 4. Alternately,
A gas guide plate 7 is installed on the air chamber 6 side of the blind portion 3, and a lateral gas outflow hole 8 communicating with the gas chamber 1 is formed at a lower end portion of the gas guide plate 7 to form the gas guide plate 7. A vertical gas outflow hole 9 is formed at the lower end portion on the combustion chamber 1 side. The shape of the combustion chamber 1 may be a box shape or a cylindrical shape, as shown in each drawing,
The lateral gas outflow holes 8 and the vertical gas outflow holes 9 may be alternately arranged. The longitudinal gas outflow holes 9 may be configured to flow along the inclined flame stabilizing plate. Reference numeral 9a is a vertical gas outflow hole which is inclined in correspondence with the inclination angle of the inclined flame stabilizing plate 2, which makes the mixed combustion and the flame adhering combustion more effective. Reference numeral 9b is a guide member configured so that the gas flowing out from the vertical gas outflow hole 9 flows along the inclined flame stabilizing plate 2. This guide member 9b also makes the mixed combustion and the adhering combustion effective, as described above.

In such a structure, the lateral gas outflow hole 8
When the gas flows out from the gas, the gas rises, mixes with the ambient air, and flows out from the slit-shaped opening 5 into the combustion chamber 1. At this time, at the same time, gas flows out from the vertical gas outflow hole 9 and rises along the blind portion 3, and this gas mixes well with the air-fuel mixture flowing out from the slit-shaped opening 5. Since the combustion is executed in this state, a good flame attached to the inclined flame stabilizing plate 2 is formed. Since the combustion is performed while being subdivided in this way, no special high temperature portion is formed, and the generation of nitrogen oxides can be suppressed. Further, in this combustion, at the same time, a lean burn progresses in the vicinity of the slit-shaped opening 5, and a gas-rich burn progresses on the blind portion 3. Due to the progress of the rich-lean combustion, NOx generation can be further suppressed.

[0008]

EFFECTS OF THE INVENTION As described above, the present invention is characterized in that rich and lean combustion and gentle combustion without a local high temperature portion can be achieved, and the generation of nitrogen oxides can be effectively suppressed. .

[Brief description of drawings]

FIG. 1 is a longitudinal explanatory view of a conventional burner.

FIG. 2 is a perspective explanatory view of a conventional burner.

FIG. 3 is a perspective explanatory view of the burner of the present invention with a part thereof cut away.

FIG. 4 is a perspective explanatory view in which the burner of the present invention is partially cut away.

FIG. 5 is an enlarged explanatory view of a main part of the burner of the present invention.

FIG. 6 is an enlarged explanatory view of a main part of the burner of the present invention.

FIG. 7 is a perspective explanatory view of the burner of the present invention.

FIG. 8 is a perspective explanatory view of the burner of the present invention.

FIG. 9 is a perspective explanatory view of the burner of the present invention.

FIG. 10 is a perspective explanatory view of the burner of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion chamber 2 Inclined flame holding plate 3 Blind part 4 Gas chamber 5 Slit-shaped opening 6 Air chamber 7 Gas guide plate 8 Lateral gas outflow hole 9 Vertical gas outflow hole 9a Inclined vertical gas outflow hole 9b Guide member

Claims (6)

[Claims] 1. A combustion chamber is composed of a flared flame stabilizing plate, and a blind portion and a slit-shaped opening communicating with the gas chamber are alternately formed on the flame stabilizing plate. A gas guide plate is installed on the air chamber side, and at the lower end of the gas guide plate,
A low nitrogen oxide generation burner having a lateral gas outflow hole communicating with the gas chamber and a vertical gas outflow hole communicating with the gas chamber at the lower end of the blind portion on the combustion chamber side. 2. A low nitrogen oxide generation burner according to claim 1, wherein the lateral gas outflow holes and the vertical gas outflow holes are alternately arranged on the air chamber side and the combustion chamber side. 3. A low-nitrogen oxide generation burner according to claim 1, wherein the combustion chamber is formed in a box shape with inclined flame holding plates facing each other. 4. A low-nitrogen-oxide generating burner according to claim 1, wherein the combustion chamber is formed of an inclined flame holding plate into a cylindrical shape. 5. The low nitrogen oxide generation burner according to claim 1, wherein the longitudinal gas outflow holes are inclined along the inclined flame stabilizing plate. 6. The low-nitrogen-oxide generating burner according to claim 1, wherein a guide member for guiding the gas flowing out from the vertical gas outflow hole along the inclined flame stabilizing plate is provided in the combustion chamber.