Furnaces – Including noncombustible fluid supply means
Patent
1985-07-16
1987-01-13
Favors, Edward G.
Furnaces
Including noncombustible fluid supply means
110309, 110347, 431 1, F23L 1300
Patent
active
046355715
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to method and apparatus for infrasonically intensifying a glow bed, supported by a grate.
Already in 1961, F. H. Reynst mentioned that it had at that time been recognized recently that acoustic vibrations have a beneficial effect on combustion. In this connection reference ts made to Pulsating Combustion, pp. 13-15, The Collected Works of F. H. Reynst, Pergamon Press, New York 1961. Although the vibrations may be only very weak, the relative motion of the gas with respect to the fuel particle which results, is sufficient to remove the envelope of combustion products around this particle, resulting in an increase of the combustion rate. Reynst describes the application of this principle to a pulverized coal burner. A mixture of fuel and air is de-ivered by a fan to a precombustion chamber located between two conical passages flaring in the direction of flow. Volatile components of the fuel are combusted in the precombustion chamber, and the flame is directed into a flame tube. The pulsations of tne flame in the precombustion chamber are propagated into the flame tube wherein the column of gas is set in resonance so as to move relatively with respect to the fuel particles, which speeds up the combustion as mentioned above.
Swedish patent specification No. 7701764-8 (publication No. 412,635) describes a method of combusting atomized solid, liquid or gaseous fuels, which is based on the principle mentioned by Reynst. However, according to this patent specification, the vibrations are not generated by the burner flame. Sound energy is supplied to the combustion flame by external means such as a sound emitter, the frequency of the sound ranging from infrasound frequencies to ultrasound frequencies. However, the method of the Swedish patent specification No. 7701764-8 apparently has not yet been utilized practically to any significant extent, which may indicate that it has not been possible so far to develop the method for industrial application.
Similar methods are described in Swiss patent specification No. 281,373 and German patent specification 472,812. According to the Swiss patent specification, vibration is imparted to at least part of the combustion chamber and the flue gases, and according to the German patent specification, a dispersion of particulate fuel and combustion air as well as secondary combustion air is brought to oscillate.
The USSR Author's Certificate 228,216 (V. S. Severyanin) describes a pulsating combustion in a bed whereby the hot grid of the Rijke tube is replaced by a layer of solid fuel in which free oscillation will develop. The effect obtained is, however, relative-y low, because only self-generated oscillation is utilized.
U.S. patent specification No. 1,173,708 describes a method for burning fuel wherein the particles of a fuel bed laying on a grate are agitated by pu1sating combustion air supplied from below through the grate. The particles of fuel are suspended and floated by the air and are permitted to settle in the time intervals between the pulsations.
The primary object of the invention is to provide a combustion method which further improves the beneficial effect of sound on combustion.
In accordance with the object of the invention this provides a metnod of the kind referred to above which has obtained the characteristics of claim 1.
The invention also provides an apparatus for working the method as defined in claim 1.
For the explanation of the invention in more detail reference is made to the accompanying drawings which disclose several embodiments of the invention and wherein
FIG. 1 shows a diagrammatic vertical cross-sectional view of a barbecue grill according to the invention, with a Helmnoltz resonator,
FIG. 2 is an end view of a constructive embodiment of the grill of FIG. 1,
FIG. 3 is a side view of the grill shown in FIG. 2,
FIG. 4 shows a diagrammatic vertical cross-sectional view of an open fire stove according to the invention, with a Helmholtz resonator, and
FIG. 5 shows a diagrammatic vertical cross-sectional view of a barbecu
REFERENCES:
patent: 2945459 (1960-07-01), Junkermann
patent: 4359962 (1982-11-01), Olsson et al.
patent: 4592292 (1986-06-01), Olsson et al.
Olsson Mats A.
Sandstrom Roland
Favors Edward G.
Insako, KB
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