Intensive pulverized coal injection operation with low strength coke at Kokura No. 2 blast furnace

Conference · Fri Jan 01 04:00:00 EST 1993 · Proceedings, Ironmaking Conference; (United States)

OSTI ID:6133385

Komatsu, S; Ohnishi, M; Shimoda, Y; Murai, T; Nagami, S

Pulverized coal injection (PCI) was introduced to Kokura No. 2 blast furnace in 1986. PC injection rate started with 25 kg/THM was increased by stages to 75 kg/THM in February, 1989. Furthermore, PC injection operation of 150 kg/THM was tried under the condition of using low strength coke and of low oxygen enrichment after doubling the capacity of the PCI plant in November, 1990. The stable furnace condition was attained through improvement of coke strength, repair of upper shaft profile and optimization of ore layer thickness, although problems of tapping difficulties and breakage of tuyeres occurred due to formation of solidified layer in the hearth in the beginning of rating-up of PC rate. This paper describes the transitions of the furnace operation and the internal furnace state.

• OSTI ID: 6133385
• Report Number(s): CONF-9303222--
• Conference Information: Journal Name: Proceedings, Ironmaking Conference; (United States) Journal Volume: 52
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010500* -- Coal
Lignite
& Peat-- Products & By-Products
BLAST FURNACES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COCOMBUSTION
COKE
COMBUSTION
DESIGN
DIMENSIONS
ENERGY SOURCES
FOSSIL FUELS
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
FUELS
FURNACES
IRON ORES
MATERIAL SUBSTITUTION
MATERIALS
OPERATION
ORES
OXIDATION
PERMEABILITY
THERMOCHEMICAL PROCESSES
THICKNESS