A105 CO_2 回収型石炭ガス化複合発電プラント

抄録

Recently, oxygen-blown integrated coal gasification combined-cycle (IGCC) has been almost commercialized as a high efficiency power generation plant. In IGCC plant, CO_2 can be easily captured from synthesis gas stream by means of CO shift conversion and conventional acid gas removal process. The overall thermal efficiency of such IGCC plant with CO_2 capture is mutually related with the ratio of CO_2 capture. The overall thermal efficiency of IGCC plant with 90% CO_2 capture is 6% to 7% points lower than that of IGCC plant without CO_2 capture. However, when the ratio of CO_2 capture is about 55%, the drop of thermal efficiency is reduced to less than half of the above fall. Those CO_2 capture and plant efficiency can be achieved without the development of new technologies. The adoption of advanced gas turbine technology and CO2 recycling technology is also being studied as system improvement methods.