JPS62261806A - Burner - Google Patents

Abstract

PURPOSE:To lower the temperatures of primary combustion flame and secondary combustion flame thereby to reduce the production of nitrogen monoxide, and nitrogen oxide by providing a burner head having a plurality of primary burner ports, also providing a primary combustion chamber covering said burner head and having at its upper part secondary burner ports, and forming a heat insulating member of a heat insulating cylinder at the side walls of said primary combustion chamber. CONSTITUTION:Primary air and a fuel ejected through a blast pipe 9 and a fuel nozzle 12 is supplied as a premixed gas to primary burner ports 16 via a premixed gas passage 13 so as to form a primary combustion flame 21. The primary combustion formed within a primary combustion chamber is conducted at limits of inflammability or higher based on primary air and less than theoretical air amount. Further, unburned components not completely burned and remain within the primary chamber 18 receive the supply of secondary air at secondary burner ports 19 thereby to form a secondary combustion flame 22. Upon this occasion, since the combustion is divided into two stages, that is, primary combustion and secondary combustion, the combustion load is lowered and a slow combustion is carried out. Hence, the amount of nitrogen monoxide generated is remarkably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improving the combustion performance of a combustion device used for room heating, etc.

BACKGROUND OF THE INVENTION A conventional combustion apparatus of this type is shown in FIG. That is, a primary flame port part 2 having a plurality of primary flame ports 1 and a secondary flame port part 4 are provided in the upper part of the primary combustion chamber 3 that covers this primary flame port part 2,
The primary combustion within the primary combustion chamber 3 is caused by fuel supplied from the fuel nozzle 5 and primary air supplied from the primary air supply port 6 . Also, the secondary combustion is in the primary combustion chamber 3.
Unburned components remaining without being completely combusted within are supplied with secondary air at the secondary flame port 4 to form combustion.

(For example, JP-A-50-138448, JP-A-5
2-120423) Problems to be Solved by the Invention In the conventional configuration as described above, the temperature of the combustion flame is reduced by dividing combustion into two stages, primary and secondary. At the same time, it was generated by the primary combustion wharf,
Because the ring element action by the active group 1c occurs, nitrogen oxides (
There was a tendency for the amount of glue generated to decrease. Shi, Kashi 1,
In the primary combustion, soot is easily generated due to the combustion reaction due to the low air ratio, and the stable combustion width in the primary combustion is narrow.

Particularly in oil combustion, the carbon content in the fuel is high and the molecular weight is large, so carbon tends to precipitate easily and soot is generated, which poses problems in practical use.

SUMMARY OF THE INVENTION It is an object of the present invention to solve these conventional problems and provide a clean and safe combustion device that generates less nitrogen oxides (Now) and hardly generates soot.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention includes a burner head having a plurality of primary flame ports 16, and a primary combustion chamber that covers the burner head and has a secondary flame port on the upper part. A heat insulating cylinder is formed by providing a heat insulating material on the side wall of the primary combustion chamber.

Effects According to the present invention, with the above-described configuration, combustion is divided into two stages, primary and secondary, so that the combustion load is reduced, the combustion flame temperature is lowered, and the amount of -nitrogen oxide (NO) generated is significantly reduced.

At this time, by adding insulation material to the side wall of the primary combustion chamber and installing a heat insulating tube, the atmospheric temperature inside the primary combustion chamber will significantly increase and the combustion rate will increase, the combustion reaction will be accelerated, and the carbon The amount of precipitation is significantly reduced (1), and the generation of soot in the primary combustion chamber can be suppressed. As a result, the stable combustion width can be expanded.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIG. 1, reference numeral 7 denotes a cylindrical bottomed vaporization chamber having a heater 8 for heating, and a blower pipe 9 is attached to the side wall of the vaporization chamber 7.
are joined, one end opens into the vaporization chamber 7, and the other end communicates with the blower 10 to supply combustion air into the vaporization chamber 7. Further, the fuel is injected into the vaporization chamber 7 by the pump 11 through the fuel nozzle 12 . The burner head 14 has a constricted premixing passage section 13 on the upper open surface of the vaporization chamber 7.
is placed. A burner cap 15 is provided on the upper open surface of the burner head 14 to close the upper opening. Further, a plurality of primary flame ports 16 are provided on the side surface of the burner head 14, and a wire mesh 17 is closely attached to the inner and outer surfaces thereof. Furthermore, the primary combustion chamber 18 is located around the burner head 14.
The upper part of the primary combustion chamber 18 is covered with a secondary flame port 19, and the inner wall side of the primary combustion chamber 18 is covered with silica.
A heat insulating material 2o made of alumina ceramic fiber is provided.

In the above configuration, the primary air and fuel ejected from the blast pipe 9 and the fuel nozzle 12 are supplied as a premixed gas to the primary flame port 16 via the premixed gas passage section 13 to form a primary combustion flame 21. . The primary combustion formed in the primary combustion chamber 18 is mainly caused by primary air above the flammability limit and below the theoretical air amount. Furthermore, the unburned components remaining without being completely combusted in the primary combustion chamber 18 are supplied with secondary air at the secondary flame port 19 to form a secondary combustion flame 22. At this time, since the combustion is divided into two stages: primary combustion and secondary combustion, the combustion load is reduced and combustion becomes slow, resulting in a low combustion flame temperature. This significantly reduces the amount of nitric oxide generated. Further, since the heat insulating material 20 is provided on the side wall of the primary combustion chamber 18, the atmospheric temperature within the primary combustion chamber 18 increases significantly, the combustion speed increases, and the combustion reaction is promoted. Therefore, the amount of carbon deposited at low air ratios is significantly reduced, and the generation of soot during primary combustion, which is low air ratio combustion, is significantly suppressed. Especially when burning kerosene,
The high proportion of carbon in the fuel, and the fact that there are two problems with the current situation. There was a tendency for the occurrence of soot to be widespread when J-f>Jin 11, but this example significantly reduces the generation of soot. In addition, due to the high atmospheric temperature in the primary combustion chamber 1B, the temperature in the vaporization chamber 7 rises 1, and the high temperature is maintained at all times, so there is no need to keep the heater 8 energized all the time, resulting in energy savings. . Further, FIG. 2 shows another embodiment in which a heat insulating cylinder 24 forming a heat insulating space 23 is provided instead of the heat insulating material 20. This embodiment also has similar functions and effects.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

(1) As the temperatures of the primary combustion flame and the secondary combustion flame decrease, the amount of -nitrogen oxide (No) generated becomes significant.

The production of nitrogen oxides (No) is significantly reduced.

(2) Combustion is slow and does not involve a sudden combustion reaction, so combustion noise is reduced.

(3) By increasing the atmospheric temperature within the primary combustion chamber, the combustion reaction is promoted, the amount of soot generated is significantly suppressed, and the stable combustion range is expanded.

4) Since the atmospheric temperature inside the primary combustion chamber increases, the vaporization chamber is easily maintained at a high temperature, and there is no need to constantly energize the heater, resulting in energy savings.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a combustion device according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part of a combustion device according to another embodiment of the invention, and FIG. 3 is a perspective view showing a conventional combustion device. It is a diagram. 14... Burner head, 16... Flame port, 18... Primary combustion chamber, 19...
Secondary flame opening, 20...-Insulation material. Name of agent: Patent attorney Toshio Nakao and 1 other person/4
-m-Bar 1-Head#----Primary opening/6----; 笈g, t-tt Fig. 2 Fig. 3

Claims (1)

[Claims] A burner head having a plurality of primary flame ports, a primary combustion chamber that covers the burner head and has a secondary flame port on the upper part, and a heat insulating material or a heat insulating cylinder provided on the side wall of the primary combustion chamber. Combustion is a combustion device that primarily uses primary air to burn above the flammability limit and below the theoretical air amount.