System for control of sinter formation in iron oxide reducing kilns
A method and means for improving control of the process for directly reducing ores containing iron oxide in a rotary kiln using a solid carbonaceous reducing agent, such as coal, introduced from the ore feed and discharge ends of the kiln, as both fuel and reductant, is disclosed wherein the temperature profile of the moving bed of solids is maintained such that the temperature is moderated to remain below the sintering temperature of the materials in the bed from the feed end zone for about the first two-thirds of the kiln length and the temperature is then maximized within sintering limitations in the working zone which is limited to about the last third of the kiln length. The temperature profile is controlled by regulating the volumes of air supplied to the kiln atmosphere from air injectors at spaced intervals along the length of the kiln, after establishing the appropriate proportion of coal steadily blown into the discharge end of the kiln for the particular process constituents being used.
- Assignee:
- Direct Reduction Corp The
- Patent Number(s):
- US 4304597
- OSTI ID:
- 5619736
- Resource Relation:
- Patent File Date: Filed date 20 Mar 1980; Other Information: PAT-APPL-132309
- Country of Publication:
- United States
- Language:
- English
Similar Records
System for recycling char in iron oxide reducing kilns
System for coal injection in iron oxide reducing kilns