A Novel CO2-capturing Natural Gas Combined Cycle with LNG Cold Energy Utilization

Abstract A novel CO 2 -capturing natural gas combined cycle is proposed, in which cold energy during LNG gasification can be fully utilized to reduce the power consumption of oxygen production and the CO 2 recovery process penalty. In a simulated example, with the GE LMS100™ gas turbine and corresponding 159 t·h −1 gasified LNG, the electrical exergy efficiency of the proposed cycle reaches 54.9%. In the same time, 90.6% CO 2 could be recovered. Compared with a natural gas combined cycle without CO 2 capture, the proposed cycle has slight net efficiency loss, and the quantity of avoided CO 2 is about 322 g·kW −1 h −1 . For a power plant with the proposed CO 2 -capturing cycle, the treated LNG is required around 119.6 t·h −1 per 100MWe generating capacity and it is 54.5% lower than that with conventional CO 2 -capturing power cycle with LNG cold energy utilization.