||Evaluation of ceramic filters for high-temperature/high pressure fine particulate control /
Poe, G. G. ;
Evans, R. M. ;
Bonnett, W. S. ;
Waterland., L. R.
||Aerotherm Corp., Mountain View, Calif.;Industrial Environmental Research Lab., Research Triangle Park, N.C.
|| Environmental Protection Agency, Office of Research and Development, Industrial Environmental Research Laboratory ; For sale by the National Technical Information Service,
||EPA/600/2-77/056; EPA-68-02-1318; EPA-ROAP-21ADL-029
Air filters ;
Air pollution control equipment ;
High temperature tests ;
High pressure tests ;
Performance evaluation ;
Electric power plants ;
Numerical analysis ;
Honeycomb structures ;
Design criteria ;
Steam power plants
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||iv, 48 pages : illustrations ; 28 cm.
High temperature gas turbines used to generate electric power require gas streams virtually free of particulate matter. Gas streams from high temperature, high pressure coal processes, such as low Btu gasification and pressurized fluidized bed combustion, require considerable particulate removal. In order to maintain high thermal efficiency the particulate clean-up must be done at the high temperatures of the process. Many new concepts for fine particulate control at elevated temperatures are presently being proposed. One such concept utilizes ceramic membrane filters. The report gives results of a study to analyze and evaluate ceramic membrane filters as a new, fine particulate (<3 micrometers) control concept for high-temperature (approx. 900C), high-pressure processes. Several ceramic filters were identified as potential candidates for fine particulate removal. There does not seem to be any inherent material limitation to high-temperature operation; however, no evidence of high-temperature filter application was found. The filters typically are 2-6 mm thick, cylindrical, and available with various pore sizes, increasing upward from 0.5 micrometer. These elements may be suitable for fine particulate control in hot gas streams. The most promising, although undeveloped, idea for a ceramic filter is to use ceramic honeycomb monoliths similar to those available for catalyst supports and heat exchangers. The walls of the monoliths are about 0.2-0.4 mm thick and of varying pore size and porosity. Geometric configurations are available which would force the gas to flow through the membrane walls. Pressure losses would be very small relative to those of standard ceramic filter elements. The application of ceramic monoliths to high-temperature fine particulate control appears very promising. It is strongly recommended that this concept be investigated further.
Prepared by Aerotherm Division/Acurex Corporation under Contract No. 68-02-1319, Task 25, ROAP No. 21ADL-029, Program Element No. 1AB012. Issued Feb. 1977. Includes bibliographical references (page 39). Microfiche.