| 摘要 |
A method or system for recovering carbon dioxide is provided with which in a plant for synthesizing methanol from a hydrocarbon gas or synthesizing gasoline therefrom via methanol, the waste heat of a low-temperature reformed gas, which has conventionally been discarded and is difficult to reutilize, can be effectively utilized. In the system for synthesizing methanol or gasoline from a hydrocarbon gas and for recovering carbon dioxide, a reformed gas is produced by steam reforming of the hydrocarbon gas. Since a combustion discharge gas generates when a fuel gas is burned in order to obtain a heat source for the steam reforming, carbon dioxide is recovered from the combustion discharge gas in an absorption tower (40) using an absorption liquid. In a regeneration tower (10), the reformed gas is used first as a heat source for a first reboiler (20A) located at the tower bottom, and the reformed gas having a lowered temperature is then used as a heat source for a second reboiler (20B) located in a middle position to heat the absorption liquid in stages, thereby regenerating the absorption liquid. |
