Hot Gas Particulate Filtration
AUTHORS: Stuart Mitchell
DATE: July 1997
Hot gas particulate filtration is a key component of current combined cycle power generation systems based on the combustion and gasification of coal. Effective particulate removal protects downstream heat exchanger and gas turbine components from fouling and erosion while cleaning the gas stream to satisfy environmental emission requirements. Additional benefits include the potential for improved cycle efficiency and the elimination of large and expensive atmospheric pressure flue gas treatment processes.
Ceramic barrier filters are the most advanced hot gas filtration technology system with several systems to commercialisation. However, problems encountered during recent pilot and demonstration-scale tests, particularly at high temperatures (up to 900 C), has led to concerns over the future exploitation of the technology. For this reason, alternative technologies such as granular beds and metallic filters continue to be developed. This report discusses the current technological and commercial status of hot gas particulate filtration technologies for application in coal-based combined cycle power systems.