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BOOSTING FUEL GAS COMPRESSOR DISCHARGE PRESSURE

IP.com Disclosure Number: IPCOM000228885D
Publication Date: 2013-Jul-10
Document File: 3 page(s) / 92K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention concerns gas turbines and fuel delivery system thereof. The invention provides a system design for boosting fuel gas compressor discharge pressure for gas turbine application by direct LNG injection to fuel gas (FG) compressor inlet with the help of an ejector and/or a pump. Use of an ejector to vaporize natural gas reduces the inlet temperature to the FG compressor to boost discharge pressure over and above that obtained by just using a venture. LNG evaporation in FG stream upstream of the compressor takes up heat from the fuel gas by absorbing latent heat of vaporization and reduces FG inlet temperature. This increases mass density and hence the discharge pressure of the inlet gas. Lower temperature also increases overall efficiency. Advantages of the invention include boosting FG Compressor discharge pressure with very minimal investment.

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BOOSTING FUEL GAS COMPRESSOR DISCHARGE PRESSURE

BACKGROUND

The invention concerns gas turbines and fuel delivery system thereof. Fuel Gas delivery system for gas turbine (GT) uses a compressor to boost the fuel gas pressure before feeding to the GT combustor. On occasion, it may be required to upgrade the delivery pressure to meet higher flow and pressure requirements than the system was initially designed for. Use of liquefied gas to eliminate a compressor or other means to increase inlet gas pressure has been disclosed in US3689237. The invention provides an improved method of increasing the nominal discharge pressure of an existing fuel gas compressor without its replacement.

DRAWING

Boosting fuel gas compressor discharge pressure is described further with reference to the following drawing in which:

Figure 1 illustrates LNG injection via ejector in fuel gas stream to boost compressor discharge pressure.

DETAILED DESCRIPTION

The invention as shown in Fig. 1 provides a system design for boosting fuel gas compressor discharge pressure for gas turbine application by direct LNG injection to fuel gas (FG) compressor inlet with the help of an ejector and/or a pump. Use of an ejector to vaporize natural gas reduces the inlet temperature to the FG compressor to boost discharge pressure over and above that obtained by just using a venture. LNG evaporation in FG stream upstream of the compressor takes up heat from the fuel gas by absorbing latent heat of vaporization and reduces FG inlet temperature. This increases mass density and hence the discharge pressure of the inlet gas. Lower temperature also increase...