Abstract
Blowing-in is a starting period of blast furnace operation after construction or major repair. The current approximation methods of blowing-in burden analysis are based on blowing-in practice of previously commissioned blast furnaces. This area is theoretically underexplored; there are no common scientifically based methods for selection of the burden composition and blast parameters. The purpose of this paper is development and scientific substantiation of the methods for selection of the burden composition and blast parameters in the blast furnace during the blowing-in period. Research methods are based on physical regularities of main processes running in the blast furnace, system analysis, and application of modern principles for development and construction of mathematical models, algorithms and software designed for automated control of complex production processes in metallurgy. As consequence of the research made by the authors the following results have been achieved: 1. A set of mathematical models for analysis of burden arrangement throughout the height of the blast furnace and for selection of optimal blast and gas dynamic parameters has been developed. 2. General principles for selection of the blowing-in burden composition and blast and gas dynamic parameters have been set up. 3. The software for the engineering and process staff of the blast furnace has been developed and introduced in the industry.
Highlights
Blast furnace blowing-in and subsequent blowing period are critical operations and correct execution of these operations has an impact on normal performance of the blast furnace, its service life, quantity and duration of mid-life repairs
The analysis of literature data related to blast-furnace production has shown that there are approximation methods of blowing-in burden analysis based on blowing-in practice of previously commissioned blast furnaces [1,2,3,4,5,6,7]
In case of forced blowing-in the first portions of slag-forming and iron-ore materials are located in the furnace stack
Summary
Blast furnace blowing-in and subsequent blowing period are critical operations and correct execution of these operations has an impact on normal performance of the blast furnace, its service life, quantity and duration of mid-life repairs. Modelling of the one-dimensional nonsteady state of temperature fields for blast furnace blowing-in was performed by foreign researchers [8,9,10]. This area is theoretically underexplored; there are no common scientifically based methods for selection of the burden composition and blast parameters. In case of forced blowing-in (with controlled slag formation and reduction) the first portions of slag-forming and iron-ore materials are located in the furnace stack. In this case, there is no necessity to gradually increase the ore load [4,5, 7].
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