Technical and economic aspects of coal injection at blast furnace tuyeres
The basic factors in selection of an auxiliary fuel have been mentioned. These include availability and cost of the auxiliary fuel, cost of injection facilities, and coke availability. Operating factors such as coal particle size, hot blast temperature, lance location, and flame temperature were discussed as they relate to the efficiency of coal combustion, therefore the economics of a system. Safety is a must when preparing and storing pulverized coal. An unsafe system will never be economical. Based on years of experience at Bellefonte a safe system has been installed at Amanda with no problems in seven years of operation. Coal quality must be considered primarily as regards ash content. A significant penalty is paid for injected ash. Both coking and non-coking coals with the same ash content have been injected with equally successful results. A simplified economic analysis gives an indication of the possible justification of a coal injection system. Replacing 130 lbs oil per net ton of hot metal with an equivalent amount of coal will result in an annual savings of 12.3 million dollars for a 5000 TPD furnace, and a cost payback of three (3) years after start-up. 3 figures, 1 table.
- Research Organization:
- Armco, Eastern Steel Div., Ashland, KY
- OSTI ID:
- 6154983
- Report Number(s):
- CONF-8103154-
- Journal Information:
- Proc., Ironmaking Conf.; (United States), Vol. 40; Conference: 40. annual ironmaking conference, Toronto, Canada, 29 Mar 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
BLAST FURNACES
ECONOMIC ANALYSIS
OPERATION
BOILER FUELS
INJECTION
AUXILIARY SYSTEMS
COAL
COKE
COMMINUTION
COST
SAFETY
CARBONACEOUS MATERIALS
ECONOMICS
ENERGY SOURCES
FOSSIL FUELS
FUELS
FURNACES
INTAKE
MATERIALS
421000* - Engineering- Combustion Systems
010600 - Coal
Lignite
& Peat- Properties & Composition