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AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l’Exploitation des Procedes Georges Claude
InventorsPascal MARTY, Guillaume RODRIGUES, Laurette MADELAINE
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In a process for separating waste gas from a ferrous metal production unit, the waste gas is compressed in a first compressor (C) and then separated by pressure swing adsorption in an adsorption unit to produce a carbon monoxide-depleted and CO2-enriched gas relative to the waste gas and a first carbon monoxide-enriched and CO2-depleted gas relative to the waste gas, the CO2-enriched gas is sent to a unit (CC) for separation by partial condensation and/or distillation which produces a CO2-rich fluid (PL) containing at least 80 mol % of CO2 and at least one portion of the first CO-enriched gas is separated by permeation (M) to form a second CO2-enriched gas relative to the first CO-enriched gas at a first pressure and a gas richer in CO than the at least one portion of the first CO-enriched gas.
A process for separating waste gas from a ferrous metal production unit in the form of a blast furnace, comprising:
A waste gas separation apparatus connected to a ferrous metal production unit comprising a blast furnace, a first compressor connected to compress a blast furnace waste gas containing at least CO, CO2, hydrogen and nitrogen, a pressure swing adsorption unit connected to the outlet of the first compressor, without passing through means for separation by permeation, the adsorption unit being configured to separate the compressed waste gas to produce a carbon monoxide-depleted and CO2-enriched gas relative to the waste gas and a first carbon monoxide-enriched and CO2-depleted gas relative to the waste gas, a unit for separation by partial condensation and distillation, a line connected to the adsorption unit and to the unit for separation by partial condensation and distillation to send the first CO2-enriched gas from the adsorption unit to a unit for separation by partial condensation and distillation, a permeation unit, a line connected to discharge a CO2-rich fluid containing at least 80 mol % of CO2 from the separation unit and a line for sending at least one portion of the CO-enriched gas from the adsorption unit to the permeation unit, the permeation unit being configured to form a second CO2-enriched gas relative to the first CO-enriched gas at a first pressure and a gas richer in CO than the at least one portion of the CO-enriched gas.
Dependencies are inferred from the claim text.