It is easy to collect fly ash samples from the economizer ash hopper. However, hopper samples may or may not be a representative sample. Many factors are involved including:
• Frequency of fly ash collection
• Particle size
• Duct configuration
• Flue gas velocities
A High Volume Fly Ash Sample collection method ensures the sample is representative of actual ash in the flue gas stream. This also provides accurate fly ash LOI information that correlates with your actual combustion efficiency.
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This analysis is performed based on ASTM D3174 with one exception. In place of the typical muffle oven used for the burnout process, we use a Hot Foil instrument. By using this equipment in place of a muffle oven, we reduce LOI analysis time to minutes instead of hours. This method is extremely helpful during combustion tuning to provide immediate LOI results.