Performance of an iron aluminide metal filter in a reducing environment

A laboratory-scale apparatus has been used for unattended, long duration, c ontinuous, flow-through testing of an iron aluminide sintered metal filter under reducing conditions. Two candle specimens were exposed for 1009 to 22 51 h to 600 degreesC gas containing 5% CO, 11% H-2, 12% CO2, 12% H2O, 60% N -2, 0.5% H2S, 2.4 ppmv NaCl, 4.7 ppmv KCl, 26.1 ppmv HCI, and 5530 ppmw ash from a transport reactor operated in gasification mode. A database was est ablished on pressure drop of the as-received and exposed filter as a functi on of face velocity and temperature. Tests were conducted to investigate th e effects of back pulse parameters on filter regenerability, Results are re ported on the critical reservoir pressure and pulse duration for maintainin g a stable saw-tooth profile of pressure drop across the filter element. Da ta are obtained to characterize the effect of chemical and thermal aging on tensile strength, fast fracture strength, and microstructure.