Browse Prior Art Database

METHOD TO INCREASE POWER OUTPUT FOR IGCC WITH CO2 CAPTURE

IP.com Disclosure Number: IPCOM000224513D
Publication Date: 2012-Dec-31
Document File: 4 page(s) / 80K

Publishing Venue

The IP.com Prior Art Database

Abstract

This publication relates an Integrated Gasification Combined Cycle (IGCC) combustor of a gas turbine plant. When converting an existing IGCC facility from a normal syngas to a shifted syngas, the gas turbine output will drop significantly because the mass flow of the high hydrogen fuel is significantly reduced. This publication discloses using part of the exhaust gas in recirculation for increasing the mass flow of the fuel inlet to the IGCC plant. The inclusion of exhaust gas in the inlet causes the mass flow of the air + recycled exhaust to increase resulting in higher mass flow into the turbine section and increasing the gas turbine output. The new method enables the prospect of retrofitting an existing IGCC with any carbon capture to an IGCC with significant carbon capture without major modifications to the gas turbine and without great loss of plant output.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 52% of the total text.

METHOD TO INCREASE POWER OUTPUT FOR IGCC WITH CO2 CAPTURE

BACKGROUND

This publication relates an Integrated Gasification Combined Cycle (IGCC) combustor of a gas turbine plant. When converting an existing IGCC facility from a normal syngas to a shifted syngas, the gas turbine output will drop significantly because the mass flow of the high hydrogen fuel is significantly reduced. To compensate for this mass flow reduction, it is desirable to introduce an inert gas to the gas turbine having a higher mass number than hydrogen. There are several ways to augment power in a gas turbine such as adding nitrogen to the fuel, moisturizing or saturating the fuel, or injecting nitrogen or steam into the combustor.

Exhaust gas recirculation or recycle (EGR) has been previously disclosed, mainly in the context of improving energy efficiency in CO2 capture or overall process efficiency (Botero et al. 2009, ElKady et al. 2009). This paper introduces the concept of EGR for addressing the problem of burning high hydrogen fuels with CO2 capture.

BRIEF DESCRIPTION OF DRAWINGS

A new method to increase power output for IGCC with CO2 capture is disclosed in which:

Figure 1 is a schematic of the concept for EGR to increase power output.

Figure 2 shows implementation of EGR in IGCC plant to increase power output.

DETAILED DESCRIPTION

The new method is illustrated in Fig. 1 and 2. As shown in Fig. 1, part of the exhaust is cooled (by condensing the water) and sent to the front end of the gas turbine compressor. This causes the mass flow of the air + recycled exhaust to increase resulting in higher mass flow into the turbine section and increasing the gas turbine output. Figure 2 shows the implementation of EGR in IGCC plant, with at least a portion of the Heat Recovery Steam Generator (HRSG) exhaust being recycled to the gas turbine combustor.

The new method can be implemented either in new plant design or retrofitted to existing plant. For CO2 capture retrofit in IGCC, the mass flow of shifted syngas after CO2 removal decreases considerably, compared to the case in which syngas is not shifted and no CO2 is removed. The method disclosed herein will contribute to making up the lost mass flow due to shifted and CO2 removed syngas, and will consequently result in greater ga...