Evaluation of ceramic filter material, selection for application
- Pennsylvania State Univ., University Park, PA (United States)
- Westinghouse Electric Corp., Pittsburgh, PA (United States). Science and Technology Center
Field testing in several of the Westinghouse Advanced Particulate Filtration (APF) systems has indicated that the oxide-based materials are more susceptible to thermal shock which results from system transients (i.e., combustion of char or reducing gases; system startup/turbine transients). The current clay bonded silicon carbide filter materials have a higher thermal shock resistance, but appear to be more susceptible to high temperature creep, as well as to changes that occur within the binder phase(s). Strength has frequently been used to assess what effects advanced coal fired process systems have on the stability and projected life of the various porous ceramic filter materials (Tables 1 and 2). Based on the numerous phase changes that occur, and the influence of pulse cleaning on the thermal fatigue characteristics of both the alumina/mullite and clay bonded silicon carbide filter materials, alternate material properties as thermal conductivity, thermal coefficient of expansion, elastic modulus, fracture toughness, and emissivity as a function of thermal/chemical aging are now being considered as critical factors for projecting filter durability and operating life. Table 3 provides a summary of the as-manufactured material properties for the alumina/mullite and clay bonded silicon carbide filter materials which have been used in the Westinghouse`s APF systems. Effort is currently being directed to determine how these properties change during thermal aging of the filters in various subpilot and pilot plant systems.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (United States). Science and Technology Center
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-88MC25034
- OSTI ID:
- 10184958
- Report Number(s):
- DOE/MC/25034-93/C0231; CONF-9306148-21; ON: DE93019874
- Resource Relation:
- Conference: Coal-fired power systems `93: advances in IGCC and PFBC review meeting,Morgantown, WV (United States),28-30 Jun 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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