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GEK Report #2: Soot on Air Preheating Tubes
Here are pictures of the air preheating tubes after 15hours of operation. The air preheating tubes are made from 4' lenghts of 5/8" corregated stainless steel natural gas lines. (Details are in GEK Report #1). The fuel was halved walnut shells at approximately 15% moisture content.
I was very pleased the relative lack of deposition on the tubes. This is a gasifier afterall. Internals are always messy. Here the soot is surprisingly light, and easy to brush off with your hand. The soot is not the oft encountered tarry black glue. I expected much greater soot and tar deposits given the temp differential between the hot gas exterior and the cold air interior.
Lower parts of the tubes have more particulate deposits. The upper parts are without such, as the long gas rising pathways tends to settle out the particles.
Next task is to run thermocouples down the tubes to get the temperature profile along the whole path.
More pictures in the gallery under GEK v0.9 .
