| 摘要 |
PROBLEM TO BE SOLVED: To provide a power plant and a process for lowering CO<SB>2</SB>emission. SOLUTION: The power plant and the process generally include extracting a portion of a recirculated CO<SB>2</SB>-rich flue gas mid-way through a compression pathway of a gas turbine and removing the CO<SB>2</SB>in a separation unit. The remaining portion of the CO<SB>2</SB>-rich flue gas (i.e., the portion of the recirculated flue gas that was not fed to the separation unit) is mixed with fresh air coming from an additional compressor-expander and then fed back to the compression pathway. As a result, flue gas recirculation increases the CO<SB>2</SB>concentration within the working fluid, leading to an additional increase in CO<SB>2</SB>partial pressure. As the concentration and partial pressure of CO<SB>2</SB>is increased, a lower energy penalty is observed to remove the CO<SB>2</SB>. Moreover, a reduced volume is fed to the CO<SB>2</SB>separation unit during operation. Consequently, the size of the separation equipment can be reduced as well as the energy required for the separation process. COPYRIGHT: (C)2008,JPO&INPIT |
