Carbon dioxide concentration analysis system for amine absorption liquid, carbon dioxide recovery system, and operation method thereof

摘要

Provided are: a system for analyzing the CO 2 concentration of an amine absorbing solution whereby the CO 2 concentration of an amine absorbing solution can be automatically measured on-line, regardless of whether the absorbing solution has a high or low amine concentration; a CO 2 recovery system; and a method for operating the same. To analyze the CO 2 concentration of an amine absorbing solution which is utilized while being circulated between an absorption column 10, in which the amine absorbing solution is brought into a gas-liquid contact with a CO 2 -containing gas to be treated so as to absorb CO 2 , and a regeneration column 20 for regenerating the absorbing solution having absorbed CO 2 , at least one factor selected from among viscosity, electric conductivity and ultrasonic wave propagation speed of the amine absorbing solution is measured by a measurement device 40 and then the CO 2 concentration of the amine absorbing solution is computed by a controller 50 on the basis of the measurement result(s).