A high-sodium lignite from the Freedom mine in North Dakota was tested in the transport gasifier at the
Power Systems Development Facility (PSDF). During the first use of the high-sodium lignite in October 2003,
agglomerated deposits formed at various locations in the transport gasifier system. An extensive laboratory
testing program was carried out to characterize the deposits, understand the mechanism of the deposit formation,
and test various methods of preventing or minimizing the agglomeration. The results of the deposit analysis
and initial lab studies suggested that sodium released from the lignite was deposited on the surface of the sand
bed material, resulting in the formation of sticky sodium silicates. Additional laboratory tests indicated that
the agglomeration could be avoided or minimized by replacing the sand with a nonreactive bed material (e.g.,
coarse coal ash), operating at slightly reduced temperatures and using certain types of additives. By using
these procedures, we completely eliminated the deposition problems in a subsequent gasification run in August
2004.
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