Thermodynamic analysis of a supercritical power plant with oxy type pulverized fuel boiler, carbon dioxide capture system (cc) and four-end high temperature membrane air separator

In this paper the analysis of a supercritical power plant was made. Power of the power plant is 460 MW. The parameters of life steam are at 29 MPa/600 oC and of the reheated steam 4.8 MPa/600 oC. Power plant is equipped with the following units: oxy type pulverized fuel boiler, "four-end" high temperature membrane (HTM) air separator and carbon dioxide capture system (CC). With the assumption of a constant gross power of the analyzed power plant the thermal efficiency of the boiler and power consumption of all mentioned above units were calculated. These parameters were designated as a function of the recovery rate of oxygen in the HTM. This allowed to make the characteristic of efficiency as a function of recovery rate. The net efficiency increased from 34.8% to 36.7% with a change of oxygen recovery rate from 0.45 to 0.9. The effect of membrane working temperature on the efficiency characteristics was also analyzed. Integration of CC, HTM air separator and steam cycle was proposed for the increase of the efficiency of a power plant. The theoretical analysis was carried out and appropriate calculations were made for this integration.