METHOD FOR PRODUCING PIG IRON IN A SHAFT FURNACE
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United States of America Patent
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Issued Date -
Jan 18, 2024
app pub date -
Sep 21, 2021
filing date -
Oct 9, 2020
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Abstract
A method of producing pig iron in a shaft furnace is provided. The shaft furnace is charged in an upper region with raw materials which fall within the shaft furnace under the influence of gravity. A portion of the raw materials is melted and/or partly reduced under the action of the atmosphere that exists within the shaft furnace. A hot gas stream which is introduced in a lower region of the shaft furnace flows through and influences the atmosphere that exists within the shaft furnace in terms of chemical composition and temperature. A cold gas stream is fed to a heat exchanger in which the cold gas stream is heated to a temperature higher than 700° C. to give a hot gas stream. The cold gas stream comprises a CO2 component of at least 5% by volume. The cold gas stream may contain, air and/or pure oxygen as residual component.
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