METHOD FOR THE EXPLOITATION OF A STEAM TURBINE INSTALLATION

WIPO Patent Application WO/2000/031469

A1

The present invention pertains to the field of thermal power generation and may be used in the exploitation of steam turbine installations (STI) in thermal power plants. This invention essentially relates to a steam turbine installation that comprises the following members: a boiler (1); a turbine with high-pressure (HPC), medium-pressure (MPC) and low-pressure (LPC) cylinders; a high-pressure superheater (HPS) arranged between the boiler (1) and the HPC; a medium-pressure superheater (MPS) arranged between the HPC and the MPC; a bypass duct (2) for the HPS; a bypass duct (3) for MPS; a power generator (4); a steam condenser (5); and a regenerative preheating system (6) for the feedwater connected to the boiler (1). During the nominal exploitation mode of the STI, or during other stationary exploitation modes, a portion of the cold steam flow is fed to the HPS and the MPS in order to be superheated, while the remaining portions of the cold steam are respectively fed to the bypass ducts (2) and (3). The superheated and cold steam flows are further mixed into a single flow which is fed into the HPC and the MPC of the turbine. The method involves supplying into the HPS and the MPS cold steam flows having a value defined by formula (I) where (III) is the flow-rate of the steam in the superheater/the flow-rate of the steam in the turbine; i¿0? is the heat content of the steam at the inlet of the turbine; i¿1? is the heat content of the steam at the inlet of the superheater; and i¿2? is the heat content of the steam at the outlet of the superheater. The method further involves reducing in the HPS and the MPS the losses in the steam working pressure down to a value defined by formula (II) where $g(D)P is the steam pressure upstream from the superheater minus the steam pressure downstream from the superheater; (III) is such as defined in claim 1; and $g(D)P¿0? is the losses in the steam working pressure in the superheater when (III) = 1. This invention improves the economical characteristics of the STI and increases the power thereof due to reduced losses in the steam working pressure in the high- and medium-pressure superheaters of said turbine plant.

JPS57113913	REHEAT EXTRACTION TURBINE
JP7185507	Steam turbine equipment, method for starting steam turbine equipment, and combined cycle plant

MASNOI SERGEI ALEXANDROVICH (RU)

PCT/RU1998/000395

June 02, 2000

November 25, 1998

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MASNOI SERGEI SERGEEVICH (RU)
MASNOI SERGEI ALEXANDROVICH (RU)

F01K7/24; (IPC1-7): F22G1/04; F01K7/22; F22G5/18

RU2070293C1	1996-12-10
RU2099542C1	1997-12-20
FR2133672A1	1972-12-01
US3580718A	1971-05-25

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