| 摘要 |
<p>In a method for energy storing and short-term power generation,an intermediate storage of a CCS system is used to store the working fluid of a CO2 based Rankine process. Liquid CO2 is stored in an underground reservoir (10) arranged to continually receive liquid CO2 at a first temperature from one or more CO2 capture sites and to discharge liquid CO2 to be transported to a final storage. The underground reservoir (10) is kept at a pressure of 8 -10 bar. When short-term power generation is needed, liquid CO2 is withdrawn from the underground reservoir (10), pressurized to about 40-50 bar, evaporated with the help of a low value heat source, and expanded in an expander turbine (13), which is connected to a generator (14). The expanded CO2 is then condensed and returned to the underground reservoir (10) at a second temperature which is higher than the first temperature. When short-term power generation is no more needed, liquid CO2 from the underground reservoir (10) is circulated through a heat pump (23) to cool the CO2 until its temperature reaches the first temperature.</p> |
