Patent ID: 8226748

Claim:
A CO 2 or H 2 S reducing system comprising: at least two CO 2 or H 2 S reducing apparatuses each of which includes an absorber that reduces at least one of CO 2 and H 2 S by bringing a provided flue gas including at least one of CO 2 and H 2 S into contact with an absorbing solution, a regenerator that regenerates a rich solution that has absorbed at least one of CO 2 and H 2 S, a rich-solution supply line that feeds the rich solution from the absorber to the regenerator, and a lean-solution supply line that feeds a lean solution from which at least one of CO 2 and H 2 S are reduced in the regenerator, from the regenerator to the absorber, wherein the absorbing solution absorbs at least one of CO 2 and H 2 S and is regenerated depending on a temperature of the absorbing solution, different kinds of absorbing solutions are provided independently to the respective CO 2 or H 2 S reducing apparatuses, and the flue gas is fed continuously in an order of a low-temperature absorbing solution on a low temperature side to a high-temperature absorbing solution on a high temperature side out of the different kinds of absorbing solutions; and a saturated-steam supply-line facility that supplies saturated steam to warm the respective lean solutions, wherein out of lean solutions that are supplied from the regenerator to the absorber, a lean solution having a high temperature is arranged at an upstream side and a lean solution having a low temperature is arranged at a downstream side.