Method for off-gas composition control in a metal smelting apparatus
AssigneeTata Steel Nederland Technology B.V.
InventorsJohannes Hage, Hendrikus Koenraad Albertus Meijer, Christiaan Zeilstra
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Abstract
A method for off-gas composition control, wherein the off-gas results from a smelting apparatus for smelting a metalliferous feed material, wherein the smelting apparatus includes a smelting vessel, a smelt cyclone mounted on the smelting vessel and in connection with the inside of the smelting vessel and an off-gas duct connected to the smelt cyclone, wherein the method provides that an oxygen containing gas containing 95% oxygen or more is injected into the smelt cyclone and that the feed material is injected into the smelt cyclone with a carrier gas other than nitrogen gas.
Claims21
A method for off-gas composition control, wherein the off-gas results from a smelting apparatus for smelting a metalliferous feed material, wherein the smelting apparatus comprises a smelting vessel, a smelt cyclone mounted on the smelting vessel and in connection with the inside of the smelting vessel and an off-gas duct connected to the smelt cyclone, and wherein the method comprises the steps of:
- injecting the metalliferous feed material with a first carrier gas into the smelt cyclone, wherein the first carrier gas comprises at least one hydrocarbon gas selected from methane, ethane and propane, or comprises at least 70 volume % carbon dioxide,
- injecting an oxygen containing gas into the smelt cyclone,
- injecting coal with a second carrier gas into the smelting vessel, wherein the second carrier gas comprises at least one hydrocarbon gas selected from methane, ethane and propane, or comprises at least 70 volume % carbon dioxide,
- injecting an oxygen containing gas into the smelting vessel,
- optionally injecting fluxes with a third carrier gas into the smelting vessel, wherein the third carrier gas comprises at least one hydrocarbon gas selected from methane, ethane and propane, or comprises at least 70 volume % carbon dioxide,
- wherein the oxygen containing gas contains 95 volume % oxygen or more and wherein the first carrier gas, the second carrier gas, and the third carrier gas are not a nitrogen gas,
- discharging the off gas from the smelting apparatus, wherein the off gas has a CO2 content of 80-89 volume %.
Dependencies are inferred from the claim text.