Ceramic barrier filters for advanced coal-based power generation systems

摘要

The objectives of this program are to identify the potential long-term thermal, chemical, and mechanical effects that advanced coal-based power generating systems have on the stability of porous ceramic filter materials. These objectives are achieved through a test program that consists of laboratory testing and analysis of field exposed filter elements. Laboratory analyses involved measurement of basic filter material properties in order to predict behavior seen in service performance. In addition, full filter elements are exposed to simulated operating conditions in order to separate the effects of the thermal, chemical, and mechanical loads experienced by the filter elements in service. The focus of this paper will be to highlight results of the analyses of filter elements that have seen service in the circulating fluidized-bed combustion (CFBC) tests facility in Karhula, Finland, and in the pressurized fluidized-bed combustion (PFBC) test facility at the American Electric Power (AEP) demonstration plant in Brilliant, Ohio. Results of laboratory testing performed in support of pilot scale filter testing will also be presented. These results indicate current generation filter materials are subject to damage from thermal stresses caused by pulse cleaning. Results of laboratory testing are also presented that explain creep behavior of clay bonded silicon carbide filter materials.