Equilibrium Considerations During Ash Deposition in Biomass Boilers

Research output: Contribution to conferencePaper


Combustion of many biomass fuels, in particular herbaceous materials such as straws and grasses, often leads to unmanageable ash depositon problems. The inorganic material from such fuels deposits on heat transfer and structural surfaces and undergoes several chemical and physical changes. For many herbaceous fuels, the resulting deposits have proven to be unmanageable for long-term operation.The formation of fly ash and its deposition on surfaces are now reasonably well understood. The complex thermochemical reactions that can occur after depositoin and, to a lesser extent, during flight of fly ash particles, are less well understood. This paper presents rational means of using non-ideal thermochemical equilibrium as an indicator of the potential difficulty of managing ash depositsin furnaces. The application of this theory to practical systems and the role of changing the chemical composition of deposits to influence their manageability are discussed. The equally important roles of chemical kinetics and the transport processes are also acknowledged.
Original languageAmerican English
PagesVol. 2: 1108-1113
Number of pages6
StatePublished - 1997
EventBiomass for Energy and the Environment: 9th Eurpoean Bioenergy Conference - Copenhagen, Denmark
Duration: 24 Jun 199627 Jun 1996


ConferenceBiomass for Energy and the Environment: 9th Eurpoean Bioenergy Conference
CityCopenhagen, Denmark

NREL Publication Number

  • NREL/CP-570-25486


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