Abstract
A laboratory-scale apparatus has been used for unattended, long duration, continuous, flow-through testing of an iron aluminide sintered metal filter under reducing conditions. Two candle specimens were exposed for 1009 to 2251 h to 600 °C gas containing 5% CO, 11% H2, 12% CO2, 12% H2O, 60% N2, 0.5% H2S, 2.4 ppmv NaCl, 4.7 ppmv KCl, 26.1 ppmv HCl, and 5530 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 tensile strength, fast fracture strength, and microstructure.
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