Abstract
Southern Company has commissioned a 2 × 1 Integrated Gasification Combined Cycle (IGCC) facility in Kemper County, Mississippi. The plant demonstrated the Transport Integrated Gasification (TRIGTM) technology developed by Southern Company, KBR, and the U.S. Department of Energy (DOE). With a capability of generating up to 524 MW net, the plant also captures CO2 from syngas produced from locally mined Mississippi lignite. Particulate Control Devices (PCDs), designed by Pall Corporation, are a critical component of the TRIGTM gasification process. The PCDs use dry filtration technology to remove essentially all the fine particulates from the syngas before it is sent to downstream processes for further gas clean-up, CO2 capture, and, finally for use in combustion turbines to generate power.The Kemper PCDs are designed to accommodate different types of filter elements for future optimization. The initial installation features the 2.5-meter long iron aluminide (FEAL) filter elements based on the extensive testing experience gained at the Power Systems Development Facility (PSDF). The PCD back-pulse system is equipped with the Coupled Pressure Pulse (CPPTM) blowback technology developed jointly by Pall’s Schumacher Division and Karlsruhe Institute of Technology for online filter element cleaning. It is the first CPPTM application of this scale used for high-pressure, high-temperature filtration in a gasification process. The Kemper facility has achieved integrated operation with production of electricity, CO2, and other by-products from syngas per design specifications. This paper describes the operations, performance, and technical issues of both the PCD and the fines cooling and handling system that were encountered during the installation, unit commissioning, and extended operation with lignite.
Highlights
Combustion turbines fired with coal-derived syngas require reliable dust filtration to protect the turbines from degradation by erosion, corrosion, or deposition
The Kemper County Project demonstrated a lignite-fueled 2on-1 Integrated Gasification Combined-Cycle (IGCC) process located in Kemper County, Mississippi
A local pressure control valve was installed on each particulate control devices (PCD) backpulse system, which cascades down the back-pulse pressure from the common header to the required value without affecting other systems
Summary
Combustion turbines fired with coal-derived syngas require reliable dust filtration to protect the turbines from degradation by erosion, corrosion, or deposition. The durability and reliability of the filter material is critical to this filtration technology These properties have been the subject of study for several years at the Power Systems Development Facility (PSDF) in Wilsonville, Alabama (Various combustion and gasification, 0000). The Pinon Pine IGCC project was equipped with a KRW gasifier This project used ceramic candles to remove entrained particles in the syngas (National Energy Technology Laboratory, 2002). Successful testing at the PSDF with syngas from a pilot Transport gasifier indicated good performance with iron aluminide candle filters in a gasification environment. These filter candles with effective peroxidation provide a thin, protective surface alumina that resists high-temperature corrosion in sulfur-bearing gasification environments. Iron aluminide filter candles were adopted for the high temperature, high pressure filtration needs at the large Kemper facility
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