Loading patent…
AssigneeThe Direct Reduction Corporation
InventorsJames A. Kennelley, Geoffrey N. Boulter, Alan C. Baker, Thomas W. Goodell, Daniel H. Wilbert
Estimating the term…
A method and means for improved control of the process for directly reducing materials containing iron oxides in a rotary kiln using a solid carbonaceous reducing agent, such as coal, introduced from the charge feed and discharge ends of the kiln, as the source of both fuel and reductant, and oxygen-containing gas introduced along the kiln length, is disclosed wherein the portion of the reducing agent fed at the discharge end is injected in the form of two or more streams through the discharge end of the kiln onto the charge bed in such manner as to permit close and efficient control of the process, particularly when carried out in larger kilns. The important features in creating and distributing the streams over the bed are described including their longitudinal distribution and axial spread, as well as their contact regions with the kiln interior side walls and the quadrants of the kiln barrel into which they are directed, to meet the incremental heat demands along the successive segments of the charge bed, whereby the bed and gas phase temperatures may be controlled and heat transfer to the bed enhanced.
Method for feeding a supply of solid carbonaceous reducing agent through the discharge end of a large rotary kiln directly reducing materials containing metal oxides wherein a major portion of the supply of the solid carbonaceous reducing agent is fed through the charge feed end and the remaining portion is fed through the discharge end, comprising the steps of:
A method of supplying reductant to the charge bed in a rotary kiln directly reducing materials containing metal oxides using a supply of solid carbonaceous reducing agent, a portion of which is fed through the charge feed end and the remaining portion of which is fed through the discharge end of the kiln and which bed has a preheat zone over about one-third of the kiln length from the charge feed end and a working zone over at least one-third of the kiln length from the discharge end, comprising the steps of:
A system for controlling heat transfer to the charge bed in a rotary kiln directly reducing materials containing metal oxides using a supply of solid carbonaceous reducing agent, a major portion of which is fed through the charge feed end and the remaining portion of which is fed through the discharge end of the kiln and which bed has a preheat zone extending over about the first one-third of the kiln length from the charge feed end and a working zone extending over at least the last one-third of the kiln length from the discharge end, comprising:
Dependencies are inferred from the claim text.