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GAS TURBINE SYSTEM STARTUP USING INSTRUMENT AIR

IP.com Disclosure Number: IPCOM000229410D
Publication Date: 2013-Jul-26
Document File: 3 page(s) / 48K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention relates to gas turbines (GT) that operate on liquid fuel (LF). Such turbines use high pressure air to atomize the LF in combustion can for smooth combustion of LF. During startup an additional compressor (startup atomizing air compressor) is used. This invention proposes to eliminate this start up compressor and use instrument air that is always available from the plant during startup. The invention simplifies the existing atomizing air system by eliminating the atomizing air startup compressor with associated filter and drive and is applicable for all GT frames that utilize liquid fuel.

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GAS TURBINE SYSTEM STARTUP USING INSTRUMENT AIR

BACKGROUND

This invention relates to gas turbines (GT) that operate on liquid fuel (LF). Such turbines use high pressure air to atomize the LF in combustion can for smooth combustion of LF. This atomizing air during normal operation is bled from the GT axial compressor. During startup, due to low pressure available at bleed, an additional compressor called startup booster compressor is used (Fig. 1). This compressor is driven by the starting motor of the GT and sucks air from the ambient through a filter. This invention proposes to eliminate this start up compressor and use instrument air that is always available from the plant during startup.

Fig. 1: Compressed air circuit for gas turbine startup using booster compressor

BRIEF DESCRIPTION OF DRAWINGS

Gas turbine system startup using instrument air is disclosed further with reference to the following drawings:

Figure 1 shows compressed air circuit for gas turbine startup using booster compressor.

Figure 2 shows gas turbine startup using instrument air.

DETAILED DESCRIPTION

The proposed modification to the compressed air circuit in a gas turbine plant is shown in Fig. 2. Instrument air (IA) is always available in the plant with a pressure range of 5 to 6 barg. As this IA pressure is more than the pressure obtained from the start up atomizing air compressor, we


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propose to provide a pressure control valve set to deliver air at required pressure to the ato...