JPH10122514A - Industrial gas burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to lower the emission rate of a fuel gas by increasing a contact area between an emission gas flow and an air flow which provides an allowance to a primary air absorbing power and thereby reduce a pressure loss and enhance an absorption effect and prevent powder from being deposited on a gas nozzle or its support area by eliminating the need to support the gas nozzle in the central part of a mixing compartment. SOLUTION: A ring-shaped pressure compartment 4 in a peripheral wall 6 near the rear end of a cylinder-shaped mixing compartment which uses an opening 2 on the front end as a burner port and an opening 3 on the rear end as a primary air supply opening. A fuel gas is pressure-fed into the pressure compartment 4 while the pressure compartment 4 is communicated with the mixing compartment 1 by means of a ring-shaped slit 5 formed all over the peripheral wall of the mixing compartment 1 where there is provided a means which directs the flow of gas emitted from the ring-shaped slit 5 toward the front of the mixing compartment 1, thereby absorbing a primary air by the flow of emitted gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial Bunsen gas burner suitable for co-firing of powders.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional Bunsen-type burner of this type. A gas nozzle 11 is disposed at the center of a mixing tube 1 and is used for combustion by the momentum of fuel gas ejected from the gas nozzle 11. It sucks air. In such a configuration, by mixing the powder with the fuel gas, the industrial waste may be incinerated, or the metal powder may be melted to perform granulation.

[0003]

However, as described above, when a Bunsen type burner that sucks combustion air by the flow rate of fuel gas is used for co-firing of powder, the powder is used as a gas nozzle 11 or its support 12. In addition, there is a problem that the deposit easily becomes air-permeable and the suction force is further reduced due to the deposit, thereby causing incomplete combustion or blocking the flow path. Also, in a normal use method without co-firing, the single gas nozzle 11 is located at the center of the mixing tube 1 and the contact area between the gas flow and the surrounding air is small. If the path becomes longer and the pressure loss in the flow path becomes larger, it becomes difficult to take in the required amount of primary air, and there is a problem that incomplete combustion is likely to occur. The present invention, in view of these problems,
An object of the present invention is to provide a Bunsen-type burner of this type which has a sufficient air suction force by a fuel gas and does not have a risk of powder being deposited in an air flow path during powder co-firing.

[0004]

As shown in FIG. 1 or 2, an industrial gas burner according to the present invention has a cylindrical shape having a front end opening 2 as a flame hole and a rear end opening 3 as a primary air supply port. An annular pressure chamber 4 is provided in a peripheral wall 6 near the rear end of the mixing chamber 1 to supply fuel gas to the pressure chamber 4 under pressure, and is formed on the peripheral wall 6 of the mixing chamber 1 over the entire circumference. Annular slit 5
Means A for communicating the pressure chamber 4 and the mixing chamber 1 with each other and directing the gas flow ejected from the annular slit 5 forward of the mixing chamber 1
Is provided, and the primary air is sucked by the jet gas flow, and characterized in that the combustion air is sucked by the jet gas flow formed along the peripheral wall 6 of the mixing chamber 1. is there. As means A for directing the jet gas flow forward, for example, as shown in FIG. 1, a lip piece for turning the gas flow jetted from the annular slit 5 forward from the peripheral wall 6 behind the annular slit 5 toward the mixing chamber 1. 7 protruding,
Alternatively, as shown in FIG. 2, it can be realized by connecting the cylindrical peripheral wall 6 of the mixing chamber 1 and one wall surface of the annular slit 5 with a smooth curved surface 8.

[0005]

FIG. 1 shows an embodiment of a gas burner according to the present invention, in which a mixing chamber 1 is formed inside a substantially cylindrical burner body 9 and a front end of the mixing chamber 1 is formed. Is open at the bottom of a short-diameter flame holding cup 10 having a large diameter, and a rear end of the mixing chamber 1 is a primary air supply port 3. An annular pressure chamber 4 is provided in a peripheral wall 6 near the rear end of the mixing chamber 1, and a medium-pressure gas (supply pressure: 1) is provided in the pressure chamber 4.
(kg / cm ² or more). Further, the pressure chamber 4 and the mixing chamber 1 communicate with each other through an annular slit 5 formed on the entire circumference of the wall surface of the mixing chamber 1, and gas is ejected from the annular slit 5 into the mixing chamber 1. An annular lip 7 protrudes from immediately behind the annular slit 5 in the peripheral wall 6 of the mixing chamber 1, and the gas flow from the pressure chamber 4 toward the center of the mixing chamber 1 is directed forward by the lip 7. Is changed, and the combustion air is sucked forward by the momentum while flowing along the peripheral wall of the mixing chamber 1.
At this time, since the contact area between the gas and the air is much larger than the conventional example of FIG. 3, when the pressure loss resistance of the flow path is large,
Alternatively, even when the air flow path is narrowed by the accumulation of powder or the like, a sufficient amount of primary air can be secured without shortage of suction force.

In the embodiment shown in FIG. 2, the cylindrical peripheral wall 6 of the mixing chamber 1 and one wall surface of the annular slit 5 are connected by a smooth curved surface 8 as means for ejecting the fuel gas forward. This utilizes a property known as the so-called Coanda effect, in which the jet tends to flow along the curved surface of the wall even if the jet direction of the jet is away from the curved surface of the wall. According to this, since the direction of the jet can be changed without forming irregularities on the peripheral wall surface of the mixing chamber 1, the pressure loss in the air flow path can be reduced, and the efficiency of air suction by the gas flow can be further increased. When co-firing the body, it is possible to reduce irregularities on which powder is deposited.

The fuel gas mixed with the primary air in the mixing chamber 1 burns in the flame hole 2 at the front end opening of the mixing chamber 1. The flame formed here is slightly lifted compared to the conventional example. Easily occur. The reason is that, in the present invention, the flow rate of the gas ejected from the annular slit 5 can sufficiently suck the primary air even at a low speed, compared with the conventional system having the gas nozzle 11 in the center of the mixing chamber 1. This is because the smaller the value, the worse the mixing of fuel and air. Therefore, in the present invention, it is desirable to open the front end opening 2 of the mixing chamber 1 on the bottom surface of the short cylindrical flame-holding cup 10 having a larger diameter than the mixing chamber 1. The turbulence is generated in the part to hold the flame and prevent lifting.

[0008]

According to the present invention, as described above, the pressurized fuel gas is jetted along the peripheral wall 6 of the cylindrical mixing chamber 1, so that the jet gas flow is smaller than that of the prior art shown in FIG. This has the advantage that the contact area between the air and the air flow is greatly increased, and that the primary air suction force can be spared accordingly, and that the fuel gas ejection speed can be reduced, so that pressure loss is reduced and suction efficiency is reduced. There is an advantage that can be increased. In addition, since it is not necessary to support the gas nozzle 11 in the center of the mixing chamber 1 as in the related art, when the powder is mixed and burned, the powder is deposited on the gas nozzle 11 and the support portion 12 thereof, and the flow path may be blocked. There is no advantage.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 mixing chamber 2 tip opening or flame hole 3 primary air supply port 4 pressure chamber 5 annular slit 6 peripheral wall 7 lip piece 8 curved surface 9 burner body 10 flame holding cup 11 gas nozzle 12 support

Claims (4)

[Claims] An annular pressure chamber is provided in a peripheral wall near a rear end of a cylindrical mixing chamber having a front end opening as a flame hole and a rear end opening as a primary air supply port. A means for supplying gas under pressure, connecting the pressure chamber and the mixing chamber with an annular slit formed on the peripheral wall of the mixing chamber over the entire circumference, and directing a gas flow ejected from the annular slit toward the front of the mixing chamber. An industrial gas burner, wherein primary air is sucked by the jet gas flow. 2. As means for directing the jet gas flow forward,
2. The industrial gas burner according to claim 1, wherein a lip piece is protruded from a peripheral wall behind the annular slit to a front surface of the annular slit. 3. The industrial gas burner according to claim 1, wherein the means for directing the jet gas flow forward comprises connecting the cylindrical peripheral wall of the mixing chamber and one wall surface of the annular slit with a smooth curved surface. 4. The industrial gas burner according to claim 1, wherein a front end opening of the mixing chamber is opened at a bottom surface of a short-diameter flame holding cup having a large diameter.