SREisme
Mechanical
- Aug 14, 2009
- 23
Has anyone experienced silica, alumina, or sodium leaching or volitizing out of newly installed hot face refractory in a fired furnace? We fouled a downstream waste heat boiler with a very fine, low density, thin ~1/32" coating that analyzes as Fe, Si, Al, Mn, Na, and other trace minerals. We just replaced all the refractory, (hot face and insulating brick)in the reaction furnace prior to restarting this unit. Within 4-6 weeks of startup, we lost approximately 10% duty across the waste heat boiler. The fouling stabilized after about 6 weeks. The reaction furnace is your typical Claus process, burning H2S, NH3, and trace impurities with atmospheric air and 23% O2 enrichment. Normal operating temperatures of the refractory inside the furnace is 2200-2400 deg F. Has anyone else experienced this effect? What can be done to prevent it? Thanks.
