F - Mech Eng,Light,Heat,Weapons – 01 – K
Patent
F - Mech Eng,Light,Heat,Weapons
01
K
60/47
F01K 3/18 (2006.01) F01K 17/02 (2006.01)
Patent
CA 1127403
21 48,267 ABSTRACT OF THE DISCLOSURE At least one heat exchanger section including a conventional heat exchanger is disposed in a dual purpose steam turbine power plant to utilize steam extracted from the steam turbine to one section of the heat exchanger for the purposes of heating process fluid of an industrial process which is conducted through another section of the heat exchanger. The heat exchanger section disclosed herein is comprised of apparatus for controlling the pres- sure of the extracted turbine steam conducted through the one section of the heat exchanger by regulating a heat transfer characteristic, preferably temperature, of the industrial fluid supplied to the other section of the heat exchanger. More specifically, the heat exchanger section includes an input end into which the process fluid is supplied; an output end to exit the process fluid at ele- vated temperatures; at least one conduit path for return- ing heated process fluid from the output end to the input end of the heat exchanger section to mix with the process fluid supplied at the input end; flow control valve dis- posed in the conduit path for regulating the flow of returned fluid to the input end; a circulation pump for 22 48,267 pumping the mixed process fluid through the heat exchanger; and a pressure controller comprising: a means for generat- ing a signal representative of the pressure of the ex- tracted turbine steam conducted through the heat exchanger; means for generating an error signal between a desired pressure set point signal and the pressure representative signal; and means for controlling the regulation of the return flow by the flow control valve as governed by a function of the error signal to converge the error signal to substantially zero, whereby the pressure of the ex- tracted steam conducted through the heat exchanger is maintained substantially at its desired pressure set point.
340457
Khemlani Moti T.
Viscovich Paul W.
Mcconnell And Fox
Westinghouse Electric Corporation
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