Apparatus and method for controlling the recycle char circuit in a direct reduction process

Patent · Tue Oct 26 04:00:00 EDT 1982

OSTI ID:7055124

Baker, A C; Bracanin, B F; Clements, R J; Hockin, H W; Keran, V P

A method and means for maintaining optimum operation of the process for directly reducing iron oxides in a rotary kiln, using a solid carbonaceous reducing agent, such as coal fed at both the charge feed end and discharge end as the source of fuel and reductant, and oxygen-containing gases is disclosed wherein the dri product, charred coal or char, and fine waste found in the kiln discharge materials from the discharge end are separated and measured for fixed carbon content and the process parameters may be adjusted to optimum by establishing an appropriate percentage by weight, in the range from 5% to 15%, of fixed carbon in the total of these discharge materials. This optimum condition may be monitored by establishing a particular level of char in the char recycle bin once the appropriate percentage by weight of fixed carbon is established in these discharge materials and optimum operation is maintained by maintaining the particular level of the char in the recycle bin and appropriately adjusting the coal feed and related parameters of the process if the char level rises or drops within the bin.

• Assignee: Direct Reduction Corp The
• Patent Number(s): US 4356031
• OSTI ID: 7055124
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010500* -- Coal
Lignite
& Peat-- Products & By-Products
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COAL
CONTROL EQUIPMENT
ENERGY SOURCES
EQUIPMENT
FOSSIL FUELS
FUELS
IRON COMPOUNDS
IRON OXIDES
KILNS
MATERIALS
MONITORING
MOTION
ORES
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
RECYCLING
REDUCING AGENTS
REDUCTION
ROTATION
TRANSITION ELEMENT COMPOUNDS