JPS5950012B2 - porous media gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a porous media gas burner (hereinafter simply referred to as a gas burner).

) regarding. This type of gas burner has already been developed by a patent application
No. 6-51132 (Japanese Patent Application No. 47-2987).

However, in this gas burner, the mixing mechanism of gas and air is based on the so-called original mixing method (internal mixing method), so especially during low combustion (when the injection speed of the air-fuel mixture is low), porous The gas burner is likely to be damaged due to flashback to the hole in the core, or in severe cases, backfire to the gas distribution space, which is also undesirable from a safety point of view.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, an object of the present invention is to provide a gas burner that does not cause flashback or backfire even during low combustion, thereby preventing damage to the gas burner and improving the safety of the gas burner. It's about forcing.

Next, an embodiment of the first invention will be explained with reference to FIGS. 1 to 5. In the figures, 1 is a cylindrical core, which is a porous material made of carborundum, zirconia, etc. A cylindrical combustion space 2 with a nozzle 3 opened at the upper end is bored in its center.

Reference numeral 4 denotes an outer cylinder having a cylindrical shape with a bottom, which is made of an impermeable material such as stainless steel or cast iron, and is externally wrapped around the core body 1 so as to cover the side and bottom surfaces thereof.

A gas distribution space 5 is formed between the outer cylinder 4 and the core body 1, and the upper surface of the gas distribution space 5 is covered with an annular airtight cover 6 made of castable refractory material or the like.

Further, the central hole of the sealing cover 6 serves as a burner port 7 that fits the nozzle 3.

The core body 1 is supported by partition plates 8 to 8, which will be described later, installed in the gas distribution space 5.

8 to 8 are a plurality of sheets (
In this example, four L-shaped partition plates are provided integrally with the inside of the outer cylinder 4, and the gas distribution space 5 is divided into the first to fourth compartments 9 to 12. It is divided equally.

A gas supply port 13.15 or an air supply port 14.16 communicating with each of the compartments 9 to 12 is opened in the bottom surface of the outer cylinder 4.

That is, gas supply ports 13 and 15 are provided at the bottoms of the first compartment 9 and the third compartment 11, and air supply ports 14 are provided at the bottoms of the second compartment 10 and the fourth compartment 12.
．． 16 are provided.

Subsequently, the functions and effects of the gas burner with the above configuration will be described.

A semi-mixed gas in which a part of the combustion air and gas are mixed in advance is supplied to the first compartment 9 and the third compartment 11 from each gas supply port 13.15.
A required amount of secondary air is supplied to the fourth compartment 12 from each gas supply port 14,16.

The semi-mixed gas or secondary air then passes through the porous fine pores of the core body 1 and is ejected into the combustion space 2 in all irregular directions.

Due to the turbulent flow created by this jet, combustion occurs in the entire area near the inner peripheral surface of the core body 1 in the combustion space 2 as the semi-mixed gas and secondary air are mixed, and the combustion gas becomes a high-temperature heat flow. and is released from the burner port 7.

Therefore, according to the gas burner, the semi-mixed gas below the flammable range and the secondary air are fed separately, and are mixed by the turbulent flow caused by the jet from the core 1. In the core body 1, the semi-mixed gas and the secondary air are hardly mixed yet, and a mixed gas in the flammable range cannot be produced.

Therefore, unlike conventional gas burners, pack fire to the core body 1, to the fludge pack, and to the gas distribution space 5 is prevented even during low combustion.

Along with this, it is possible to widen the turndown ratio from maximum combustion to minimum combustion compared to conventional products, as well as use ultraviolet light monitoring equipment for monitoring combustion conditions, pilot burner, and ignition. Sparks and the like can be easily installed in any position without considering the adverse effects of the fludge pack.

Moreover, the best combustion can be easily obtained by separately adjusting the feed rates of the semi-mixed gas and the secondary air.

Next, an embodiment of the second invention will be described based on the embodiment of the first invention with reference to FIG.

In this gas burner, the nozzle 3 of the combustion space 2 in the gas burner of the first invention is formed into a tapered shape that tapers toward the tip, thereby forming an oblique guide surface 21.

According to this gas burner, in addition to the effects of the first invention described above, the slanted guide surface 21 generates a more complicated turbulent flow of semi-mixed gas or secondary air. A sufficient mixing effect with the secondary air can be obtained, the mixed gas can be completely combusted, and a high-temperature heat flow can be ejected from the burner port 7 at high speed.

In this example, it is formed in a tapered shape, but it may be formed in a tapered step shape.

Note that instead of the semi-mixed gas that was sent to the first compartment 9 and the third compartment 11, only gas may be supplied.

Further, the number of branch rooms 9 to 12 may be increased or decreased as appropriate.

Furthermore, if appropriate protrusions are provided on the inner circumferential surface of the core body 1 in the shape of a baffle plate, the mixing of gas and air can be further promoted.

That is, the first invention described in claim 1 is:
A combustion space 2 with a nozzle 3 opened at the upper end is formed in the center of the core body 1 made of a porous material, and a cylindrical body made of an impermeable material is formed in the concentric body 1 so as to cover the side and bottom surfaces. A gas distribution space 5 is formed between the core body 1 and the outer tube 4, and partition plates 8 to 8 are arranged between the concentric body 1 and the outer tube 4. The gas distribution space 5 is divided into a plurality of compartments 9 to 12, and each of the compartments 9 to 12 is provided in the outer cylinder 4.
Gas supply ports 13, 15 or air supply ports 1 communicating with
4.16, and gas and air are individually supplied to each of the compartments 9 to 12. Unlike the conventional original mixing system, this system has a particularly low combustion rate. Flash packs and backfires at times are prevented.

This has the unique effect of solving the problem of damage to the gas burner and improving safety.

In addition, a second invention as set forth in claim 2 is characterized in that, in addition to the configuration of the first invention, the nozzle 3 of the combustion space 2 is formed in a tapered shape toward the tip. Therefore, in addition to the effects of the first invention, it is possible to promote complete combustion of the mixed gas, and there is also an effect that high-temperature heat flow can be ejected at high speed.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the first invention, in which Figure 1 is a front view, Figure 2 is a top view, Figure 3 is a bottom view, and Figure 4 is a bottom view.
The figure is a front sectional view, FIG. 5 is a cross-sectional view, and FIG. 6 is a front sectional view showing a second invention based on the first invention. 1... Core body, 2... Combustion space, 3... Nozzle, 4
... Outer cylinder, 5 ... Gas distribution space, 8 - 8 ... Partition plate, 9 - 12 ... Separate chamber, 13.15 ... Gas supply port, 14, 16 ... Air supply port , 21... oblique guide surface.

Claims (1)

[Claims] 1. A combustion space 2 with a nozzle 3 opened at the upper end is formed in the center of a core body 1 made of a porous material, and a combustion space 2 is formed in the core body 1 to cover the side and bottom surfaces. A cylindrical outer tube 4 made of a permeable material is sheathed, and a gas distribution space 5 is formed between the core body 1 and the outer tube 4, and the concentric body 1 and the outer tube 4 are
The gas distribution space 5 is divided into a plurality of compartments 9 to 12 by disposing partition plates 8 to 8 between the outer cylinder 4 and each compartment 9 to 12.
A porous medium gas burner characterized in that gas supply ports 13, 15 or air supply ports 14, 16 are provided which communicate with the chambers 12, and gas and air are individually supplied to each of the compartments 9 to 12. . 2 A combustion space 2 with a nozzle 3 opened at the upper end is formed in the center of the core body 1 made of a porous material, and a cylinder made of an impermeable material is formed in the concentric body 1 to cover the side and bottom surfaces. A shaped outer cylinder 4 is sheathed, a gas distribution space 5 is formed between the core body 1 and the outer cylinder 4, and partition plates 8 to 8 are arranged between the concentric body 1 and the outer cylinder 4. The gas distribution space 5 is divided into a plurality of compartments 9 to 12, and each of the compartments 9 to 1 is provided in the outer cylinder 4.
A gas supply port 13.15 or an air supply port 14.16 communicating with the nozzle 3 is provided so that gas and air are individually supplied to each of the compartments 9 to 12.
A porous media gas burner characterized in that a porous medium gas burner is formed in a tapered shape toward a tip.