METHOD FOR SEPARATING AND COLLECTING CARBON DIOXIDE FROM BLAST FURNACE GAS IN BLAST FURNACE GAS UTILIZATION PROCESS

摘要

Disclosed is a method for separating and collecting carbon dioxide from a blast furnace gas in a blast furnace gas utilization process. The method comprises: introducing a blast furnace gas removed from a blast furnace into an absorption column; allowing carbon dioxide contained in the blast furnace gas to be absorbed in an absorption liquid in the absorption column; introducing a portion of the blast furnace gas from which carbon dioxide has been removed into an expansion turbine; reducing the pressure in the expansion turbine; storing the portion of the blast furnace gas in a gas holder and utilizing the stored gas as a heating fuel for an iron-making process; introducing another portion of the blast furnace gas from which carbon dioxide has been removed into a blast gas compressor that can be driven by the expansion turbine; increasing the pressure in the blast gas compressor; introducing the another portion of the blast furnace gas into a gas turbine generator, burning the another portion of the blast furnace gas under a high pressure and utilizing the burned gas as a fuel for the generation of an electrical power; introducing the absorption liquid which has absorbed carbon dioxide in the absorption column into a regeneration column; heating the absorption liquid introduced into the regeneration column by means of heat of a discharged gas from the gas turbine generator to remove carbon dioxide from the absorption liquid; and circulating the absorption liquid from which carbon dioxide has been removed from the regeneration column to the absorption column.