Performance simulation on NG/O2 combustion gas and steam mixture cycle with energy storage and CO2 capture.

A novel combustion gas and steam mixture cycle (GSMC) power generation system was simulated and studied in this paper. The system integrates the technologies of NG/O 2 combustion, energy storage, peak-shaving and CO 2 capture with LNG/LO 2 cold energy utilization, which has remarkable features such as high efficiency, low first/operation/maintenance costs, zero CO 2 and NO x emission and massive off-peak power shifting. A calculation case is presented and the impacts of turbine inlet parameters, condensing pressure/condenser outlet temperature and feedwater temperature on the net electric efficiency excluding ASU and equivalent net electric efficiency as well as CO 2 capture features are analyzed. The steam content in vapor phase of the condenser outlet is considered which requires more cooling capacity for CO 2 capture. Under the conditions that the condenser outlet temperature/condensing pressure is 30 °C/30 kPa and feedwater temperature is 300 °C, with fully CO 2 capture, the net electric efficiency excluding ASU and equivalent net electric efficiency are 0.4386 and 0.4105 respectively with turbine inlet parameters of 600 °C/30 MPa, and they can reach 0.5327 and 0.5046 respectively with turbine inlet parameters of 1000 °C/40 MPa. [ABSTRACT FROM AUTHOR]