A laboratory-scale apparatus has been used for unattended, long duration, continuous flow through testing of a vacuum formed chopped ceramic fiber filter under reducing conditions at atmospheric pressure. Four candle specimens were exposed from 150 to 3550 h to 600°C gas containing 4 percent CO, 11 percent 12 percent 14 percent 59 percent 1 ppmv NaCl, 50 ppmv and 1000–2000 ppmw ash from a transport reactor operated in gasification mode. A database was established on pressure drop of the as-received and exposed filter as a function of face velocity and temperature. Tests were conducted to investigate the effects of back-pulse parameters on filter regenerability. Results are reported on the critical reservoir pressure and pulse duration for maintaining a stable saw-tooth profile of pressure drop across the filter element. Data are obtained to characterize the effect of chemical and thermal aging on the apparent bulk density of the filter, pore size distribution, fast fracture strength, and microstructure. It is suggested that the compliant filter undergoes a slow process of rigidization upon exposure to the test environment.
Performance of a Vacuum Formed Chopped Ceramic Fiber Filter in a Reducing Environment
Contributed by the Coals, Biomass, and Alternative Fuels Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the CBAF Division, July 1998; final revision received by the ASME Headquarters Oct. 2000. Editor: H. D. Nelson.
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Ahluwalia, R. K., Novick, V. J., Zhang, L., Sutaria, M. P., and Singh, J. P. (July 1, 1998). "Performance of a Vacuum Formed Chopped Ceramic Fiber Filter in a Reducing Environment ." ASME. J. Eng. Gas Turbines Power. April 2001; 123(2): 293–302. https://doi.org/10.1115/1.1362669
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