STARTING SYSTEM OF STEAM TURBINE PLANT WITH STEAM REHEATING Russian patent published in 2000 - IPC

FIELD: unit-type steam turbine plants; two bypass starting system. SUBSTANCE: proposed starting system has dump steam line with pressure reducing and cooling unit between live steam line and reheat cold line for passing steam bypassing high pressure cylinders, its control valves with servomotors controlled by electric system, direct-acting nonreturn valve at high pressure cylinder outlet to prevent getting of steam from reheat cold line into high pressure cylinder and hydraulic control system. For this purpose nonreturn valve is coupled with single-action servomotor in pressure line of which shutoff valves with electric drive are installed. This electric drive is coupled with electric control system of high pressure cylinder control valves providing opening of shutoff valves in synchronism with opening of high pressure cylinder control valves. EFFECT: provision of high reliability of nonreturn valve, prevention of its influence on hydrodynamics of steam flow passing through nonreturn valve. 1 dwg