| 摘要 |
<p>1501671 Burners ALLIS-CHALMERS CORP 21 Aug 1975 [4 Sept 1974] 34794/75 Heading F4T A fluid-delivery nozzle 20 for a rotary orereducing kiln 10 comprises a hollow elongated body 22 to be mounted on the outside of the kiln to rotate therewith, closed at one end to form a chamber 75 connectible to a fluid source, a hollow sleeve 36 extending through body 22, a nozzle tip 40 having a fluid passage 42 therethrough, a liquid fuel tube 38 slidably received within sleeve 36 and connectible to a liquid fuel supply 68, an inlet port 62 in the nozzle body, and an outlet port 64 which communicates with nozzle chamber 75 for the passage of gaseous fluid. There may be more than a hundred nozzles 20 circumferentially and axially spaced on the surface of the kiln. In operation, methane may be used as the reductant so that as a given nozzle 20 rotates with the kiln, beneath the bed of ore, the gas enters port 62, passes into chamber 75 and out through port 64. As the nozzle moves from beneath the bed, port 62 is disconnected, and when the nozzle reaches an elevated position above the bed of ore, port 62 is connected to a source of oxidizing gas. Instead of using gas as the reductant however, oil may be supplied through oil tube 38 and passes into the kiln through passages 39, 41, 42 and orifice 60, the oxidizing gas being supplied through ports 62, 64, as before, the fuel and gas supply being controlled by a valving system. Oil tube 38 is adjustable in sleeve 36 and can be reciprocated therein in order to clean the nozzle, or removed so that a cleaning rod or a different oil tube can be inserted. Ore is prevented from entering chamber 75 by a baffle 70. In a modification, the nozzle tip is mounted substantially flush with the inner bore of the kiln and the gases discharge through ports (112) in a direction parallel to the axis of the nozzle Figs. 2, 3 (not shown). The oil tube 38 and sleeve 36, are cooled by the oxidizing gas (air) which passes through chamber 75.</p> |
