Mechanical behavior of ceramic composite hot-gas filters after exposure to severe environments

Conference · Tue Aug 01 04:00:00 EDT 1995

OSTI ID:416483

Pysher, D J; Weaver, B L; Smith, R G ^[1]

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1. Ceramic Technology Center, St. Paul, MN (United States); and others

A novel type of hot-gas filter based on a ceramic fiber reinforced ceramic matrix has been developed, as reported at previous Fossil Energy Materials Conferences, through research activities at Oak Ridge National Laboratory (ORNL) and at the 3M Company. Simulated testing has been done at the Westinghouse Science and Technology Center. This filter technology has been extended to full size, 60 mm OD by 1.5 meter long candle filters and a commercially viable process for producing the filters has been developed filters are undergoing testing and demonstration use throughout the world for applications in pressurized fluidized-bed combustion (PFBC) and integrated gasification combined cycle (IGCC) plants. Demonstration tests of this ceramic composite filter along with other filters are in progress at the Tidd PFBC plant Mechanical tests were performed on the 3 M brand Ceramic Composite Candle Filter after exposure to various corrosive environments in order to assess its ability to function as a hot gas filter in coal-fired applications. Due to the different construction of ceramic composite filters and the thin composite wall versus the typical thick-walled monolithic filter, standard mechanical property tests had to be refined or modified to accurately determine the filters properties. These tests and filter property results will be described Longitudinal tensile and diametral O-ring compression tests were performed on as-produced candle filters as well as on filters which had been exposed to various environments. The exposures were for 1000 hrs at 850{degrees}C in wet air, in wet air containing Na{sub 2}CO{sub 3}, and in wet air containing NaCl. In addition, a filter which bad been coated with ash (Old Grimethorpe) was exposed to wet air at 850{degrees}C for 1000 hours.

• Research Organization: Oak Ridge National Lab., TN (United States)
• OSTI ID: 416483
• Report Number(s): ORNL/FMP--95/1; CONF-9505204--; ON: DE96001412
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
CERAMICS
COAL
CORROSION
FILTERS
FILTRATION
HOT GAS CLEANUP
MECHANICAL PROPERTIES
PRESSURE DROP
SILICON CARBIDES
SODIUM CARBONATES
SODIUM CHLORIDES
TENSILE PROPERTIES
TIME DEPENDENCE