JPS62258907A - Burner - Google Patents

Abstract

PURPOSE:To attemp to reduce the amount of developed nitrogen oxides by placing the primary flame openings of a burner head opposite to each other. CONSTITUTION:The surrounding area round a burner head which has a plurality of primary flame openings 12 is covered by a primary combustion chamber 13, and the lower section of the primary flame opening 12 is a pre-mixing chamber 15. The primary air which is supplied from a primary air supply opening 16 and the fuel supplied from a fuel nozzle 17 are mixed in this pre-mixing chamber and the mixture is supplied to the primary flame opening to form a primary combustion flame 18. Because the primary flame openings 12 are mutually opposite to each other, the flames interfere with each other and because the radical in the flame 18 which exists in a large amount near the flame 20 intrudes into the outer flame 21, tie NO which exists there is partially reduced to become N2 gas and the amount of NOx that is produced decreases a great deal.

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 The fourth factor is a conventional combustion device of this type. 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 secondary combustion chamber 3 is formed from fuel supplied from the fuel nozzle 5 and primary air supplied from the secondary air supply port 6. Also, the secondary combustion is the primary combustion
The unburned portion remaining without being completely combusted inside is supplied with secondary air at the secondary flame port 4 to form combustion. Furthermore, 7 is a premixing chamber, 8 is a secondary combustion surface, 9 is a burner caulking part, and 10 is a secondary flame opening throttle part. (For example, JP-A No. 5
Problems to be Solved by the Invention However, in the conventional construction as described above, combustion is separated into two stages: primary and secondary. As a result, the temperature of the combustion flame decreases, and a reduction effect occurs due to the active groups generated by the secondary combustion, so nitrogen oxides (NO
Although there was a tendency for some of the amount of x) to be generated, the amount was still large for combustion bags for home heaters, and there was a problem in practical use from the standpoint of toxicity.

The present invention is intended to solve these conventional problems, and aims to provide a safe combustion device that generates less nitrogen oxides (NOx).

Means for Solving the Problems In order to solve the above-mentioned problems, the combustion apparatus of the present invention includes a burner head having a plurality of primary flame ports, and a primary combustion chamber that covers the burner head and has a secondary flame port on the upper part. A chamber is provided, and at least some of the primary flame ports are opposed to each other.

Effects The present invention has the above-described configuration, and because the combustion is divided into two stages, primary and secondary, the combustion load is reduced and the combustion flame temperature is lowered. Also, since the primary flame ports are facing each other at this time, the flames interfere with each other! As a result, nitric oxide (NO), which is rapidly generated in the wake of the flame, undergoes a reducing action by radicals in the flame and partially changes into nitrogen (N2). Therefore, in a state where the temperature rise of the combustion flame is suppressed, -
The amount of N08 produced in the subsequent combustion is significantly reduced, and the amount of total nitrogen oxides (No.) is also significantly suppressed.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIG. 1, reference numeral 11 denotes a burner head having a plurality of primary combustion ports 12, the periphery of which is covered with a primary combustion chamber 13, and the upper part of the secondary combustion chamber 13 has a secondary combustion port 14. is the provision. Further, the lower part of the primary flame port 12 is a premixing chamber 15, and the primary air supplied from the secondary air supply port 16 and the fuel supplied from the fuel nozzle 17 are mixed in this premixing chamber 15. It is supplied to the primary flame port 12. Further, at this time, the primary flame ports 12 are facing each other.

In the above configuration, the secondary air supply port 16, the brick nozzle 1
The primary air and fuel ejected from 7 are mixed in the premixing chamber 15 and supplied to the primary flame port 12 to create the next combustion flame 1.
form 8. The primary combustion formed in this secondary combustion chamber 13 is mainly due to the primary air, which exceeds the flammability limit, BI!
Burn below the stoichiometric amount. Further, the unburned components remaining without being completely combusted in the secondary combustion chamber 13 are supplied with secondary air at the secondary flame port 14 to form a secondary combustion flame 19.

At this time, the primary flame ports 12 are facing each other, so the flame 1
8 interfere with each other. Here, No. A is the No. suppression mechanism depending on the formation state of the combustion flame 18.
A large amount is generated in the process from the inner flame 20 to the outer flame 21 in 8. However, since flame 18 is facing, flame 1#
Radical B in 3 (internal inflammation; present in large quantities near 0)
enters the outer flame 21, the NO present here is partially reduced by radicals and becomes nitrogen m (N″2), and NO (also, when the secondary combustion flame 1 faces As a result, the flame stability of the flame is improved □, and the premixed gas mixture property is improved □, which stabilizes fP and sintering □, and reduces soot □
Occurrence is also suppressed.

Effects of the Invention As described above, according to the combustion apparatus of the present invention, the following (1)-
Since the fire flame was facing the river, radicals in the flame interfered, and due to its reducing action, some of the nitrogen monoxide (N'O) changed to nitrogen (N>)G, resulting in nitrogen oxidation. (NOx) generation is significantly reduced.

- Since the combustion flames are facing each other, flame stability is improved, incomplete combustion is less likely to occur, and - carbon oxide (
The generation of CO) etc. can be suppressed.

(3) - Generation of soot is significantly suppressed by stabilizing the combustion flame.

- Since the combustion is Msk, there is no sudden combustion reaction, so the combustion noise is significantly reduced.

[Brief explanation of drawings]

11@ is a cross-sectional view of a main part of a combustion device according to an embodiment of the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is an enlarged view of the main part, and FIG.
The figure is a perspective view showing a conventional combustion metal. 11...burner spatula)', L2...primary flame port, 13...-secondary combustion chamber, 14...
・Secondary flame opening, 18... - Fire combustion flame. Name of agent: Patent attorney Toshio Nakao and one other person U-
---Hana head/Z----ng
figure

Claims (1)

[Claims] It consists of a burner head having a plurality of primary burner ports, and a primary combustion chamber that covers the burner head and has a plurality of secondary burner ports in the upper part, and at least some of the primary burner ports are opposed to each other, and Primary combustion is a combustion device that primarily uses primary air to burn the air above the flammability limit and below the theoretical air amount.