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Start-up control for steam turbine using particle measurement

IP.com Disclosure Number: IPCOM000039898D
Publication Date: 2005-Feb-01

Publishing Venue

The IP.com Prior Art Database

Abstract

During a controlled start-up of a steam turbine a signal is taken from a particle measurement probe located in the steam flow in order to determine the presence and number of solid oxide particles spalled off boiler tubes. A bypass steam valve, allowing steam to flow directly from the boiler to the condenser, is open until the particle number in the steam flow reaches a pre-determined level acceptable in terms of surface roughening of the turbine blades due to solid particle erosion. When the pre-determined particle incidence level is reached, the bypass valve is closed and steam is passed direction to the high pressure turbine. The start-up method allows optimized electrical power production at a minimized level of solid particle erosion.