GB1398040A - Supercritical steam turbine power cycle - Google Patents

Abstract

1398040 Steam turbine plant critical pressure POLSKA AKADEMIA NAUK INSTYTUT MASZYN PRZEPLYWOWYCH GDANSK WRZESZCZ 7 June 1973 [10 June 1972] 27134/73 Addition to 1312607 Heading F1T [Also in Division F4] In a supercritical steam turbine power cycle the steam is expanded in a steam turbine stage T 1 to a pressure above the critical pressure, the steam then being divided at point 11 into two streams one of which undergoes further expansion in a steam turbine stage there being reheating between turbine stages and multi-stage regenerative feed water heating by means of steam extracted from the turbine - none of this is shown in the Figure. The other stream is used as a heating medium being thereby cooled, in a high temperature regenerative heat exchanger RWC, this stream being then reunited with the stream which has been heated by regenerative feed water heating, the united streams then being heated in the regenerative heat exchanger RWC and in the boiler K. The regenerative heat exchanger RWC comprises a plurality of sections the mass flow rate of the heating medium in one section differing in a stepwise fashion from the mass flow rate in an adjacent section. In Fig. 1 the mass flow in section B is greater than that in section A, while that in section C is less than that in section B, that in section D is greater than that in section C, and that in section E is greater than that in section D. In Fig. 2 the heat exchanger RWC comprises three sections F, G, H the flow of heating fluid in section G being less than that in sections F and H since part of the heating fluid discharging from section F is passed to a separate heat exchange system Qg and is then returned to pass through section H together with heating fluid from section G.