Monotube boiler feedwater and steam temperature control

Claim 1

IN A FLUID HEATING CIRCUIT PRODUCING THROUGHOUT THE NORMAL OPERATING LOAD RANGE THEREOF A VAPOR IN THE SUPERCRITICAL PRESSURE RANGE, THE METHOD OF CONTROLLING THE UNHEATED FLUID FED TO SAID CIRCUIT, COMPRISING THE STEPS OF HEATING SAID FLUID TO AN EXIT TEMPERATURE IN EXCESS OF THE CRITICAL TEMPERATURE AND AT A PRESSURE IN EXCESS OF THE CRITICAL PRESSURE, EXTRACTING THROUGHOUT SAID NORMAL OPERATING LOAD RANGE A PORTION OF SAID FLUID, SAID PORTION BEING INDEPENDENT OF THE LOAD DEMAND AND REDUCING THE PRESSURE THEREOF FROM A PRESSURE IN EXCESS OF THE CRITICAL PRESSURE TO A PREDETERMINED PRESSURE BELOW THE CRITICAL PRESSURE OF CAUSE SAID FLUID PORTION TO FORM A TWO-PHASE MIXTURE OF LIQUID AND VAPOR, SEPARATING THE VAPOR FROM THE LIQUID, EFFECTICELY DETERMINING THE FLUID FLOW RATE IN AT LEAST ONE OF SAID PHASES WHILE MAINTAINING SAID PREDETERMINED PRESSURE, AND ADJUSTING SAI UNHEATED FLOW RATE IN RESPONSE TO VARIATIONS IN THE FLUID FLOW RATE IN ONE OF SAID PHASES.