Method for controlling a smelting reduction process
AssigneeCorus Staal BV
InventorMark Bernard Denys
Life of this patent
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Abstract
Method for controlling a smelting reduction process, in particular a cyclone converter furnace process for producing pig iron, characterized in that one: measures the carbon fraction C in the off-gas in the form of CO and Co2O; measures the hydrogen fraction H2 in the off-gas in the form of H2 and H2O; determines the C/H2 ratio in the off-gas; compares the C/H2 ratio thus determined in the off-gas against the C/H2 ratio prevailing for the coal being supplied, and adjusts the coal supply based on the difference found in the C/H2 ratios in the off-gas and the coal being supplied.
Claims17
A method for controlling a smelting reduction process for producing pig iron wherein oxide iron material, coal and oxygen are supplied and an off gas is produced, comprising the steps of:
- measuring the carbon fraction C in the off-gas in the form of CO and CO2
- measuring the hydrogen fraction H2 in the off-gas in the form of H2 and H2O;
- determining the C/H2, ratio in the off-gas;
- comparing the C/H2 ratio determined in the off-gas against the C/H2 ratio prevailing for the coal being supplied, and
- adjusting the coal supply based on the difference found in the C/H2 ratios in the off-gas and the coal being supplied such that the fraction of char formed from the coal in a slag layer is kept stable, the fraction being not much less than 20%.
Dependencies are inferred from the claim text.