STEAM TURBINE POWER PLANT (VERSIONS) Russian patent published in 2015 - IPC F01D3/04 

FIELD: machine building.

SUBSTANCE: steam turbine power plant comprises a high-pressure turbine (104), a medium-pressure turbine (106) and three low-pressure turbines. The three low-pressure turbines comrpise two LP turbines (108) forming a double-flow LP turbine (108) and one single-flow LP turbine (110). The HP turbine (104) and the MP turbine (106) are made so that each of them essentially balances the axial force of the other. The double-flow LP turbine (108) is also balanced as per axial force. A steam extraction unit supplies HP steam from the HP turbine (104) to the cavity under the single-flow LP turbine (110). The said cavity in the direction to the single-flow LP turbine is essentially limited by a fixed structure surrounding a shaft (102). The plant comprises a thrust piston (128) connected to the shaft (102) and in the direction from the single-flow LP turbine the said cavity is essentially limited by the said piston (128). The thrust piston (128) can counteract the axial force produced by the single-flow LP turbine (110) in the course of operation.

EFFECT: invention allows for the reduction of costs on production and maintenance, and for increased efficiency due to the usage of thrust piston with smaller surface area and supply of HP steam to it.

14 cl, 3 dwg