STEAM TURBINE AND DEVICE TO START STEAM TURBINE Russian patent published in 2015 - IPC F01D19/00 

FIELD: power engineering.

SUBSTANCE: steam turbine and device for its start are proposed. A steam turbine (100) comprises a group of stages, a steam path (108), an inlet hole (104), an outlet hole (106), an entrance hole (110), an exit hole (112). The steam path (108) passes via the specified group of stages (102). The inlet hole (104) supplies steam (117) to the first stage (101), from which it arrives into the steam path (108). The outlet hole (106) is located near the last stage (103) and is designed to provide for discharge of spent steam from the steam path (108) of the steam turbine (100). The entrance hole (110) is designed to provide for steam ingress (117) into the steam path (108) in the area located downstream from the inlet hole (104). The exit hole (112) is designed to provide for discharge of steam (117) from the steam path (108) and is located upstream from the entrance hole (110) to provide for development of back flow (116) of steam (117) to the exit hole (112) from the entrance hole (110).

EFFECT: availability of an exit hole arranged upstream from an entrance hole and providing for development of a back flow of colder steam from the entrance hole to the exit hole, provides for maintenance of temperature and pressure of steam in the group of stages for preservation of preferable temperature during start-up.

10 cl, 1 dwg