Patent ID: 6460490
Filing Date: 2002-10-08
Classification: F22B

Abstract:
A heat-recovery, steam-generator flow system in a recuperative dual-fluid engine comprising:a supply of feedwater; a first mixing means for combining said feedwater with a predetermined portion of heated economizer effluent to raise the temperature of said feedwater to a predetermined value for supply as heated feedwater to an economizer heat exchange means and a steam drum; a feedwater pump for circulating said heated feedwater; control means for diverting a first portion of said heated feedwater to said economizer heat exchange means and a second portion of said heated feedwater to a second mixing means; said first portion of said heated feedwater flows through said economizer heat exchange means for supply as heated economizer effluent to said first mixing means and said second mixing means; said second portion of said heated feedwater flows through said second mixing means and is mixed with a portion of heated economizer effluent to subcool the water supplied to a steam-drum by a predetermined amount; a recirculation pump for delivering said subcooled water mixture to an evaporator heat-exchange means whereby a portion of said subcooled water is vaporized to achieve a predetermined recirculation mass ratio in the water/steam mixture returned to said steam-drum; a superheater heat exchange means for receiving a predetermined quantity of steam from said steam drum and heating said steam to a predetermined superheat temperature for supply to said recuperative dual-fluid engine; regulating means for regulating said first mixing means, said second mixing means and said control means.