F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
39/32
F27B 7/36 (2006.01) C21B 13/08 (2006.01) F27B 7/34 (2006.01)
Patent
CA 1049780
NOZZLE FOR ROTARY KILN ABSTRACT OF THE DISCLOSURE A nozzle for use with a rotary kiln of the type used for reducing ore, such as iron ore, to a lower state of oxidation. The nozzle, which may be one of many similar axially and circumferentially spaced nozzles mounted on the kiln, projects in a generally radial direction through the kiln shell to inject fluid into the interior of the rotary kiln. The nozzle comprises a gas passage for admitting a reductant gaseous fluid such as natural gas (methane) or an oxidizing fluid such as air into the kiln at appropriate times in the cycle of rotation of the kiln. The nozzle also includes a central oil tube slidably adjustably mounted in a sleeve which extends to the nozzle tip. The gas passage through the nozzle forms a hollow chamber around the sleeve in which the oil tube is enclosed, whereby the gas passing through the hollow chamber provides a cooling action on the oil tube and on the nozzle tip. The discharge outlet of the oil tube may be located within its enclosing sleeve in spaced relation to the nozzle tip, and in a cooler zone than the nozzle tip, whereby to minimize clogging of the oil tube discharge outlet by carbon deposits or the like. By loosening a compression fitting which secures the central oil tube to its enclosing sleeve, the central oil tube may be slidably moved within its enclosing sleeve to permit cleaning of carbon deposits from the nozzle tip. A quick disconnect coupling at the inlet end of the central oil tube permits disconnection of the oil supply to the oil tube while the kiln is rotating, permitting insertion of a cleaning rod in the oil passage of the central oil tube to "rod out" the central oil tube, the cleaning rod being extendible into cleaning engagement with the nozzle tip. By loosening the aforesaid compression fitting, with the elements of the quick disconnect coupling also detached, the central oil tube may also be completely removed and replaced with another oil tube while the kiln is rotating. An important feature of the construction is the fact that the oil passage which forms part of the nozzle structure is fluidly isolated from the passage through the nozzle for the gaseous fluids handled by the nozzle such as natural gas or air. The inlets of the nozzle to the gaseous fluids and to the liquid hydrocarbon (if used) are connected by valving to the appropriate fluid supply manifolds at appropriate times in the rotation of the kiln.
233521
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