Intensive pulverized coal injection operation with low strength coke at Kokura No. 2 blast furnace
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-; CODEN: PIRCB9
- Journal Information:
- Proceedings, Ironmaking Conference; (United States), Vol. 52; Conference: 52. ironmaking conference, Dallas, TX (United States), 28-31 Mar 1993; ISSN 0099-6874
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BLAST FURNACES
OPERATION
COAL
COCOMBUSTION
COKE
DESIGN
FUEL FEEDING SYSTEMS
IRON ORES
MATERIAL SUBSTITUTION
PERMEABILITY
THICKNESS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTION
DIMENSIONS
ENERGY SOURCES
FOSSIL FUELS
FUEL SYSTEMS
FUELS
FURNACES
MATERIALS
ORES
OXIDATION
THERMOCHEMICAL PROCESSES
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