Process for removing carbon dioxide from combustion exhaust gas.

摘要

A process for removing carbon dioxide (CO2) from a combustion exhaust gas of a boiler which generates steam for driving high, intermediate, and low pressure turbines. The process comprises the steps of removing CO2 in the combustion exhaust gas by absorption with a CO2-absorbing liquid, liquefying the removed CO2 by compression and cooling, storing the CO2, and regenerating the CO2-absorbing liquid by a CO2-absorbing liquid regeneration column equipped with a reboiler. In the process, a part of steam discharged from the high pressure turbine is used to drive turbines for compressors that compress and cool the CO2, and steam discharged from the compressor turbines is supplied as a heating source to the reboiler for the regeneration of the CO2-absorbing liquid. A decrease in the overall power plant efficiency due to the removal of carbon dioxide from the exhaust gas can be reduced.