Combustion – Mixer and flame holder
Patent
1986-12-11
1988-07-05
Scott, Samuel
Combustion
Mixer and flame holder
239414, 2394164, 239432, 239562, F23D 1462
Patent
active
047551364
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention concerns a burner for gaseous fuels, particularly for boilers, as well as a process for the burning of gaseous fuels with excess air under changing load in a combustion chamber.
The known burners of this type permit only a regulating in the range of 80 to 100% of the rated output. They therefore make difficult an operation which is as uniform as possible of such burners in the sense of prolonged operating times of a boiler.
The purpose of the present invention is the creation of a burner for gaseous fuels which makes possible regulation within a wide range with optimal operation of the burner, i.e. with an efficiency which is substantially constant over the range of regulation. Such a measure is also in the interest of the protection of the environment.
The burner of the invention, which broadly satisfies these requirements, is distinguished by the fact that sliding and/or turning means are provided in order to assure at least an approximately constant quantitative ratio of gas to combustion air, at least over an output range of 10 to 100% of the rated output.
BRIEF DESCRIPTION OF THE DRAWING
One embodiment of the invention is explained below with reference to a figure which shows a longitudinal section through a burner for gaseous fuels that is installed on a boiler.
DESCRIPTION OF A PREFERRED EMBODIMENT
A gas burner 1 is installed in a boiler 2 having an output of, for instance, up to 300 KW. A boiler wall 3 together with a portion of the water chamber 4 of the boiler 2 can be seen. The gas burner 1 is bolted to the boiler wall 3 by means of a fastening flange 6.
A lateral blower-air feeds connection 7 feed combustion air from the blower (not shown) into an air prechamber 9, which is preferably cylindrical. The latter is limited by a tubular jacket 10 and an outer bottom 11 welded thereon. Inside said jacket is a cylindrically arranged air control plate 12 with lateral openings 13. An immersion tube 14, within which a slide 15 which is also tubular is longitudinally displaceable, also forms part of the burner housing. The immersion tube 14 and slide 15 are mounted for displacement within each other by two guide rings 16, while a suitable sealing ring 17 prevents the rising of air-gas mixture coming from the slide 15. A burner tube 19 is welded on the tubular slide 15, in its extension, the end of which tube is closed by a bottom 20, while lateral flame holes 21 permit the emergence of the combustible gas-air mixture.
Above the slide 15, which is open at its rear, and limited, on the one side, by the outer bottom 11 and, on the other side, by the air control plate 12, there is an entrance chamber 23 within which the combustion air entering through the openings 13 meets the gas which enters through the corresponding exposed openings 31, in order then to flow together into a mixing chamber 24. Perforated plates such as the air control plate 12 are known in fluid dynamics. Here they serve to improve the mixing process, to premix the gas and the air in front of the mixing chamber 24. A static mixer 26 is arranged within the mixing chamber 24. Turbulators, such as are used in flue gas pipes, or similar baffle plates which produce an optimum mixing to a homogeneous gas-air mixture, can be employed. In this connection, care should be taken that the dimensions of the mixer 26 are such that no noticeable backwash effect occurs on the entrance chamber 23 or, in other words, that the entrance cross sections of the openings 13 and 31 in the said control region are alone substantially determining for the ratio of gas to combustion air which is at least approximately constant over the range.
The gaseous fuel passes through a gas feed pipe 28 and a connection nipple 29 into a gas dosing tube 30 which is provided with corresponding lateral openings 31. A regulating rod 33, which can be moved back and forth from the outside, extends through the gas dosing tube 30 and is guided by a stuffing box 34 and is firmly connected by means of an end holder 35 and
REFERENCES:
patent: 1480146 (1924-01-01), Bradshaw
patent: 2377497 (1943-01-01), Hopkins
patent: 2863500 (1958-12-01), Schumann
patent: 3331424 (1967-07-01), Heinrich
Kamen Noah P.
Scott Samuel
Ygnis S.A.
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