A novel CO2-capturing natural gas combined cycle with LNG cold energy utilization

A novel CO2-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 CO2 recovery process penalty. In a simulated example, with the GE LMS100 (TM) 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% CO2 could be recovered. Compared with a natural gas combined cycle without CO2 capture, the proposed cycle has slight net efficiency loss, and the quantity of avoided CO2 is about 322 g.kW(-1)h(-1). For a power plant with the proposed CO2-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 CO2-capturing power cycle with LNG cold energy utilization. (C) 2014 The Authors. Published by Elsevier Ltd.