Patent ID: 9562471
Date: 2017-02-07
CPC Classifications: F01D,F01K,F02C,G05B

Claim:
1. A method, comprising: a first step of providing a thermodynamic and mass flow model of a closed split flow recompression Brayton cycle power generation system; a second step of inputting an estimate of the temperature at the exit of a low temperature recuperator; a third step of inputting an estimate of total mass flow of the closed split flow recompression Brayton cycle power generation system; a fourth step of inputting an estimate of a mass flow split between a primary and a secondary compressor; a fifth step of calculating the primary compressor and the secondary compressor operating conditions from the thermodynamic and mass flow model based on input conditions; a sixth step of comparing fluid pressure at the secondary compressor outlet calculated in the fifth step to the fluid pressure on the high pressure side at the low temperature recuperator outlet, and if those pressures not equal then inputting a new mass flow split into the fourth step, and if those pressures are equal then proceeding to a seventh step, and if not iteratively repeating the step until they are equal; the seventh step that includes calculating primary turbine and secondary turbine operating conditions from the thermodynamic and mass flow model based on the input conditions; an eighth step that includes comparing mass flow calculated by the thermodynamic and mass flow model to the mass flow estimate input in the third step, and if those values are equal, then proceeding to the ninth step, and if not equal then inputting a new mass flow into the third step until those values are equal; a ninth step calculating high temperature and low temperature recuperator conditions; a tenth step that includes comparing the outlet temperature of the exit of the low temperature recuperator calculated by the thermodynamic and mass flow model to the outlet temperature of the low pressure side of the low temperature recuperator estimated in step two, if those values are not equal, then returning to the second step and inputting a new estimate of the temperature at the exit of the low temperature recuperator until those values are equal, and then proceeding to the eleventh step; and wherein the eleventh step identifies and produces start-up and steady state operating conditions set points that are used to start-up and operate the closed split flow recompression Brayton Cycle power generation system.