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Title: Blast furnace injection symposium: Proceedings

Abstract

These proceedings contain 14 papers related to blast furnace injection issues. Topics include coal quality, coal grinding, natural gas injection, stable operation of the blast furnace, oxygen enrichment, coal conveying, and performance at several steel companies. All papers have been processed separately for inclusion on the data base.

Publication Date:
OSTI Identifier:
485015
Report Number(s):
CONF-960983-
TRN: IM9727%%183
Resource Type:
Conference
Resource Relation:
Conference: Blast furnace injection symposium, Cleveland, OH (United States), 10-12 Nov 1996; Other Information: PBD: 1996
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; BLAST FURNACES; FUEL SUBSTITUTION; LEADING ABSTRACT; MEETINGS; COAL; NATURAL GAS; COKE; FUEL CONSUMPTION; METAL INDUSTRY; COAL PREPARATION; FUEL FEEDING SYSTEMS

Citation Formats

NONE. Blast furnace injection symposium: Proceedings. United States: N. p., 1996. Web.
NONE. Blast furnace injection symposium: Proceedings. United States.
NONE. 1996. "Blast furnace injection symposium: Proceedings". United States. doi:.
@article{osti_485015,
title = {Blast furnace injection symposium: Proceedings},
author = {NONE},
abstractNote = {These proceedings contain 14 papers related to blast furnace injection issues. Topics include coal quality, coal grinding, natural gas injection, stable operation of the blast furnace, oxygen enrichment, coal conveying, and performance at several steel companies. All papers have been processed separately for inclusion on the data base.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month =
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

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  • This report contains the talks presented at the symposium on the present state of regulations, origin and suppression of EAF dust formation, a scientific look at EAF dust treatment, commercial and developing technologies, and the dezincing of scrap. Questions and answers following the presentations as well as those originated during the panel discussion are covered in the report. A brief description of some treatment processes is also included.
  • An extensive study of the phenomena associated with the blast furnace injection of massive quantities of coal is described. Trials with conventional lances or oxy-coal injectors and hot blast at different oxygen contents - up to 40% - or with cold pure oxygen were realized at coal to oxygen ratios corresponding to a range of 150 to 440 kg. Pilot scale rigs, empty or filled with coke, as well as industrial blast furnaces were utilized.
  • 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 ofmore » 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.« less
  • 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.more » 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.« less
  • ILVA decided to introduce PCI (Pulverized Coal Injection) to reduce the cost of hot metal by using non-coking coal, reducing purchased coke and closing down of aged coke batteries. Also by producing less coke, more time would be available for repair and rebuilding of existing batteries. Coal injection started at Taranto blast furnaces Nos. 4, 2, 5 and 1 in September, October, November, 1991 and January, 1992 respectively. A central grinding and injection station supplies coal to the blast furnaces. The hot metal capacity of these furnaces amounts to 28,000 t per day altogether. With a specific injection rate ofmore » 200 kg/thm for each blast furnace, in total 234 t of fine coal per hour is ground and injected. Plant concept is based on the latest development in pneumatic conveying and injection technique developed by Kst Stahltechnik. PCI project was an important contribution to ILVA philosophy of green production of iron making aiming at replacing 35% of coke production by PCI. Energy saving also leads to less dependence on foreign energy market and better energy balance in the plant. Economic evaluation study revealed that injection level of 150 kg per thm will result in reduction of total cost of fuel by 16% and that of hot metal by 5%.« less