Heating – Processes of heating or heater operation – Controlling flame position or work atmosphere
Patent
1976-11-01
1978-05-30
Camby, John J.
Heating
Processes of heating or heater operation
Controlling flame position or work atmosphere
110246, 201 32, 202100, 432105, 432109, F27D 700
Patent
active
040920984
ABSTRACT:
Temperature control is often a problem in direct-fired rotary kilns for the pyrolysis of carbonaceous materials wherein at least part of the thermal energy for pyrolysis is obtained by in situ combustion of the pyrolysis gases. The present process and apparatus provides a means by which temperature control, and particularly reduction in intensity of the fireball at the burner end of the kiln and/or moving the fireball away from the burner hood. This is accomplished by (1) controlling the velocity of any burner gases and the velocity of the in situ air (or other oxygen-containing gas) and (2) the distribution of the in situ air at the burner end of the kiln, such that a Craya-Curtet number of at least 0.2, and preferably at least 0.4, is obtained. In a preferred embodiment, the in situ air is admitted into the burner hood from a plenum chamber disclosed circumferentially around at least a portion of the kiln, the air entering the burner hood through the annulus defined between the outer shell of the kiln and the burner hood.
REFERENCES:
patent: 997381 (1911-07-01), Fasting
patent: 1800247 (1931-04-01), Buckbee
patent: 1929880 (1933-10-01), Darrah
patent: 3542348 (1970-11-01), Jahn et al.
"Some Details of the Structure of an Axissymmetric Confined Jet with Back Flow" by Barchilon and Curtet, Journal of Basic Engineering/Transactions of the ASME, June 1971, pp. 192-198.
Proceedings of the Ninth Symposium (International) on Combustion held at Cornell University, Ithaca, N.Y. Aug. 27-Sept. 1, 1962, Pubished 1963 in Academic Press: (a) "Mixing and Flow in Duoted Turbulent Jets" by Becker, Hottel and Williams, pp. 7-20 and (b) "Modeling of Double Concentric Burning Jets" by Beer, Chigier, and Lee, pp. 892-900.
Honaker Donald E.
Jacobs, Jr. Louis J.
Camby John J.
Hoffman Arthur E.
Monsanto Company
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