Low cost filter development and control of permeability in high temperature, high pressure ceramic filter elements. Final report.

摘要

For over a decade GTE Chemical and Metallurgical Division has been manufacturing cordierite ceramic crossflow heat exchangers. The heat exchanger application calls for a ceramic body that can withstand thermal shock, has good compressive strength and is capable of being formed into a impermeable membrane. With this experience base, it was a logical technology extension to pursue the engineering of this type of structure into a ceramic crossflow filter. The majority of this effort involved improving the permeability of the ceramic membrane to an adequate level for use in the hot gas particle removal from coal derived gas streams. When the permeability is achieved then the area of interest could shift to improvements of strength. As in most engineering situations, creating porosity was known to decrease strength and some trade off was probably going to be required. In addition to incorporating permeability into the existing extrusion and lay up technology, a secondary task was developed to investigate the possibility of creating the crossflow shape by means of some type of casting technique. The casting technique was of interest because it held promise of lower manufacturing costs and elimination of the interlayer bonds used in the other process. 13 figs.