Anthony Ross Infrared Imaging of Black Liquor Droplets

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Anthony RossInfrared Imaging of Black Liquor
Droplets
Academic Advisor Dr. David Sailor Industry
Advisor Dan Higgins, P.E.

• Team Members
• Aaron Brandt
• Will Carter
• Brent Illingworth
• Matt Travis

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Background

• Kraft paper pulping process schematic

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Mission

• Design an optical assembly
• Images are used to generate data
• Data is used to improve boiler model

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Project timeline
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Existing sizing techniques

• Laser Detector Systems
• Laser passes through spray
• Photodetectors gather scattered light

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Existing sizing techniques cont

• Imaging systems
• Light focused onto CCD to produce digital image
• Software analyzes images and outputs size
• Distance to droplets must be known

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Sizing technique to be used

• Infrared imaging system
• Other systems infeasible
• Camera currently used for maintenance
• High contrast due to temperature difference
• Additional marketability of IR camera

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Major requirements

• Depth of focus must be short enough
• Focal length must be adjustable and known
• Viewing angle must be adjustable
• Adequate cooling and cleaning

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Depth of focus must be short enough

• Software will only measure droplets that are in
  focus
• Focal length can accurately be used as the
  distance to droplets
• Optics aperture affects depth of focus

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Focal length must be adjustable and known

• Exact measurement region is unknown
• Needs to adapt to different boiler configurations
• Must be known to scale droplet image size to
  actual size
• Affects depth of focus magnification

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Focal length adjustment

• Dual lens system allows for focus adjustment
• Fine adjustment of rear lens necessary

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Viewing angle must be adjustable

• Optics system will be inserted above spray

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Viewing angle must be adjustable

• Mirror based system
• Fiber optics based system

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Fiber optic imaging

• Fiber bundles
• Flexible
• Coherent
• Light entering and exiting must be parallel
• Many components available

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Viewing Angle Adjustment

• Bracket assembly
• Planetary gear assembly

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Cooling/Cleaning

• Compressed air on sight
• Safe to use in boiler
• Air purge system for lens cleaning
• Air flow limited by compressed air pressure
• One or two air ports could be used

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Decision Matrix
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Future considerations

• Optics system
• Dimensions
• Calibration
• Depth of focus
• Utilize manufacturer expertise
• Cooling system
• Detailed analysis
• Thermal expansion
• Material selection

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Conclusion

• Existing sizing methods analyzed
• Infrared imaging confirmed as most feasible
• Major requirements established
• Possible solutions compared
• Overall concept decided

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Complete Concept
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• Questions?