Sequential supplementary firing in combined cycle power plant with carbon capture: part-load operation scenarios in the context of EOR

This paper extends previous work on sequential supplementary firing combined cycles (SSFCC) and evaluates their part-load operation in order to define operating strategies to maximise revenue from electricity and Enhanced Oil Recovery (EOR) over a range of fuel input. Sequential supplementary firing consists of burning additional fuel at different stages in the heat recovery steam generator (HRSG) to increase CO2 concentration reduces the volumetric flow of the flue gases. It uses almost all of the oxygen in the flue gas and keeps the maximum gas temperature at around 820 °C to avoid large additional capital costs in the HRSG. SSFCC This analysis is important in order to establish ways to maintain a minimum CO2 flow for EOR when the power plant with CO2 capture is at minimum stable generation.

Two alternatives to reduce power at part-load are evaluated: a subcritical steam cycle with a combination of variable inlet guide vanes and reduction in supplementary firing; and a strategy where the gas turbine is maintained at full output and the power output is solely reduced by adjusting the amount of supplementary firing in the HRSG.