JPH01114606A - Burner - Google Patents

Abstract

PURPOSE:To enable an independent control having a wide TDR for a primary combustion and a secondary combustion by a method wherein a wall of a secondary combustion chamber is provided with a plurality of air holes opposed to each other on the same plane and then an area of passage of combustion gas between a primary combustion chamber and the secondary combustion chamber is reduced. CONSTITUTION:Two walls 1 of a primary combustion chamber of a burner are arranged to be opposite to each other and provided with a plurality of flame holes 5. The flame holes 5 are opposed to each other in the same manner as that of the primary combustion walls 1. A mixture gas branch pipe 6 is arranged at an upstream side of the mixture gas of a primary combustion chamber 4, and the flame holes 5 are positioned at an outlet of a mixture gas supplying passage 7 communicating with the primary combustion chamber 4 and the mixture gas branch pipe 6. In addition, a secondary combustion wall 8 is oppositely arranged at a downstream side of the combustion gas so as to form a secondary combustion chamber 9, and the secondary combustion chamber wall 8 is provided with a plurality of air holes 30 opposed to each other on the same plane. A partition plate 11 is installed between the primary combustion chamber 4 and the secondary combustion chamber 9 so as to reduce a passage area between them. An opposing flame 22 at the primary combustion chamber to be formed is stabilized at a flame abutting part of the primary combustion chamber 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a burner used in fan heaters, stoves, and the like.

2. Description of the Related Art Conventionally, burners such as fan heaters and stoves have been provided with a wire mesh in the burner head or the flame hole of the burner head, and a flame is formed near the wire mesh. ° like this
The burner first burns fuel and air in a partially premixed manner.
Air was obtained on the downstream side of the flame to ensure complete combustion.

Problems to be Solved by the Invention However, in such burners, when the combustion amount is increased, the flame tends to blow out, and the combustion amount variable range (hereinafter referred to as TDR)
There was a problem that the area (which is assumed to be Additionally, because of the partially premixed combustion, combustion on the primary side is easily disturbed by secondary air.

The present invention provides a burner with a wide TDR and easy control of combustion on the primary side and secondary side.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms a primary combustion chamber by arranging a pair of primary combustion chamber walls having a plurality of flame holes at a fixed distance from each other to form a pair of flames. The holes are also coaxially opposed, and - a mixture branch pipe is provided on the upstream side of the mixture combustion chamber, so that the flame hole is located at the outlet of the mixture supply path that communicates the primary combustion chamber and the mixture branch pipe. On the downstream side of the combustion gas, a secondary combustion chamber is formed by opposing the walls of the secondary combustion chamber, and the walls of the secondary combustion chamber are provided with a plurality of air holes facing each other on the same plane. The structure is such that the combustion gas passage area between the secondary combustion chambers is made small.

Effect With the above configuration, opposing flames are formed in the combustion chamber, and the flow velocity is reduced at the flame collision part, improving flame stability. Therefore, even if the combustion amount becomes large or the air ratio becomes large, the flame will not be blown away. It becomes difficult. Furthermore, since the secondary air does not easily flow into the primary combustion chamber, it does not disturb the combustion on the primary side.

EXAMPLE A specific explanation will be given below using the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the burner. As for the burner: - fire combustion chamber wall 1
, the side plate 2, and the bottom plate 3 form a combustion chamber 4, and the two combustion chamber walls 1 are provided so as to face each other. Further, the -flame combustion chamber wall 1 is provided with a plurality of flame holes 5, and like the -flame combustion chamber wall 1, the flame holes 6 are also opposed to each other. - A mixture branch pipe 6 is provided on the air-fuel mixture upstream side of the fire combustion chamber 4, so that the flame hole 5 is located at the exit of the mixture supply path 7 that communicates the fire combustion chamber 4 and the mixture branch pipe 6. I have to. Further, on the downstream side of the combustion gas, a secondary combustion chamber 9 is formed by opposing the secondary combustion chamber walls 8, and the secondary combustion chamber wall 8 has a plurality of air holes 1o opposed to each other on the same plane. It is set up.

A partition plate 11 is installed between the negative combustion chamber 4 and the secondary combustion chamber 9. In this embodiment, the partition plate 11 is shown, but the same effect can be achieved as long as it reduces the passage area between the negative combustion chamber 4 and the secondary combustion chamber 9. Further, on the upstream side of the mixture branch pipe 6, there are a throat 12, a vaporization chamber 13, and a vaporization tube 14, and the vaporization tube 14 is provided with a sheathed heater 16. The vaporization cylinder 14 communicates with an air passage 16, and has a fuel injection nozzle 17 inside. The secondary combustion chamber 9 is connected to the secondary air passage 18. The above configuration is for when liquid fuel is used, but when gaseous fuel is used, the vaporization cylinder 14 is not required and the throat 12
Therefore, on the downstream side, it can be used in the same configuration as when using liquid fuel.

Next, the operation will be explained. First, the sheathed heater 16 is energized to heat the vaporization cylinder 14, and then the fuel 19 is ejected from the fuel injection nozzle 17. And fuel 19
The air collides with the vaporization cylinder 14, vaporizes, and mixes with the primary air 2o sent at the same time, passes through the throat 12, and becomes a homogeneous air-fuel mixture 21. After that, move to the mixture branch pipe 6,
The mixture passes through a plurality of pipe-shaped air-fuel mixture supply passages 7 and is supplied to the negative combustion chamber 4 from the flame holes 5 that face each other on the same axis, and after ignition, forms a primary facing flame 22 . Subsequently, secondary air 23 is supplied from the air hole 1o provided in the secondary combustion chamber wall 8.
According to the secondary flame 24. After forming and completely burning,
It is discharged.

In this way, the primary facing flame 22 formed is -
At the flame collision part of the fire combustion chamber 4, the flow velocity is reduced and a stagnation area is formed to stabilize the flame. Therefore, even if the combustion amount or air ratio increases, the flame is less likely to blow off compared to conventional burners. On the other hand, when the combustion amount and air ratio become smaller, the flame enters the flame hole 6 and tries to backfire. However, since the combustion chamber wall 1 and the air-fuel mixture supply path 7 are cooled by the cooling air 26, the flame can stably burn near the flame hole 5 without flashback. Therefore, as a burner, TD
It becomes possible to widen R.

Furthermore, when the primary side opposing flame 22 moves away from the flame hole 6, some -carbon oxide (CO) is generated from the vicinity of the flame hole 5.
Since a large number of flame holes 6 are arranged, the generated Co is oxidized by the adjacent primary side opposing flame 22. Therefore, even if the primary side opposing flame 22 moves away from the flame hole 6, the exhaust gas characteristics as a burner will not deteriorate.

Furthermore, after forming the primary side opposing flame 22, a secondary flame 24 is formed by the secondary air 23 supplied from the air hole 1o provided in the secondary combustion chamber wall 8. Since a partition plate 11 is provided between the secondary combustion chamber 9 and the secondary combustion chamber 9 to reduce the passage area of the combustion gas, the secondary air 2
3 does not enter the primary combustion chamber 4, and stable secondary combustion can be performed without disturbing combustion on the primary side. In addition, by providing the partition plate 11, the vicinity of the outlet of the primary combustion chamber 9 can be heated to a high temperature, so the oxidation treatment function of Go is also excellent, and in experiments, compared to the case where the partition plate 11 is not provided, It was confirmed that the CO value could be reduced to below A.

By providing the partition plate 11 in this way, it is possible to improve the combustion on the primary side and separate the combustion on the primary side and the secondary side, so it is easy to control the length and shape of the secondary flame 24, and the heat exchanger This makes it easier to perform stable combustion as a burner even when the burner is installed on the downstream side.

Incidentally, the combustion on the primary side is not limited to an air ratio of 1 or less, and the same effect can be achieved even if the air ratio is 1 or more.

Effects of the Invention As explained above, according to the burner of the present invention, the following effects can be obtained. By forming opposing flames and cooling the upstream side of the flame hole, it is possible to suppress flame blow-off and backfire, and to widen the TDR.

In addition, by providing a partition plate between the primary combustion chamber and the secondary combustion chamber to reduce the passage area of combustion gas, CO
This improves the oxidation treatment function of the heat exchanger, improves combustion on the primary side, and separates combustion on the primary and secondary sides, making it easier to control the length and shape of the secondary flame, making it easier to control the heat exchanger. Even when installed, it is easy to achieve stable combustion as a burner.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a burner showing one embodiment of the present invention;
The figure is a longitudinal sectional view of the burner. 1... Primary combustion chamber wall, 5... Flame hole, 6...
...Mixture branch pipe, 7...Mixture supply device, 8.
...Secondary combustion chamber wall, 1o...Air hole, 11
・・・・・・Partition plate, 14...Carbonizer cylinder. Name of agent: Patent attorney Toshio Nakao and one other person
-Mixture branch pipe 7--Mixture supply path 10-Dan KL 14-Carbonizer cylinder 1st figure 4...Primary pit 5-Flame JL No. 21!1

Claims (1)

[Claims] A pair of primary combustion chamber walls having a plurality of flame holes are made to face each other at a certain distance to form a primary combustion chamber, and the flame holes in the pair are also coaxially opposed to each other so that the air-fuel mixture is mixed on the upstream side of the primary combustion chamber. A gas branch pipe is provided, the flame hole is located at the outlet of a mixture supply path that communicates the primary combustion chamber and the mixture branch pipe, and the secondary combustion chamber wall is opposed to the downstream side of the combustion gas. A secondary combustion chamber is formed, and the wall of the secondary combustion chamber is provided with a plurality of air holes facing each other on the same plane to reduce a combustion gas passage area between the primary combustion chamber and the secondary combustion chamber. A burner characterized by: