Anthony Ross Infrared Imaging of Black Liquor Droplets Team Members: Aaron Brandt Will Carter Brent...
-
date post
22-Dec-2015 -
Category
Documents
-
view
219 -
download
1
Transcript of Anthony Ross Infrared Imaging of Black Liquor Droplets Team Members: Aaron Brandt Will Carter Brent...
Anthony RossInfrared Imaging of Black Liquor Droplets
Team Members:Aaron Brandt
Will Carter
Brent Illingworth
Matt Travis
Academic Advisor:Dr. David Sailor
Industry Advisor:Dan Higgins, P.E.
Background
• Kraft paper pulping process schematic
White Liquor
Steam
Smelt
Weak Liquor
concentratedBlack Liquor
E-1
E-2
E-3
E-4 E-5E-6
P-1 P-2 P-3 P-4
P-5P-6
Pulp Digester
Evaporator Evaporator Evaporator
Recovery Boiler
Causticizer
P-7
Air
Combustion consumessolids
Sodium returned to NaOH and NaS
Schematic of Pulping Process
E-7
P-8
P-9
Turbine
Mission
• Design an optical assembly • Images are used to generate data• Data is used to improve boiler model
Project timeline
ID Task Name Start Finish DurationJan 2005 Feb 2005 Mar 2005 Apr 2005 May 2005
1/2 1/9 1/16 1/23 1/30 2/6 2/13 2/20 2/27 3/6 3/13 3/20 3/27 4/3 4/10 4/17 4/24 5/1 5/8 5/15 5/22 5/29 6/5
1 4w1/28/20051/3/2005PROJECT DESIGN SPECS.
2 3.2w2/18/20051/28/2005INTERNAL / EXTERNALSEARCH
3 5w3/11/20052/7/2005CONCEPT GENERATION
4 7.2w3/28/20052/7/2005OPTICS DESIGN
5 2.8w2/24/20052/7/2005ACTUATION DESIGN
6 5w3/28/20052/22/2005HOUSING DESIGN
7 6.8w4/8/20052/22/2005SELECTION & EVALUATIONOF FINAL DESIGN
8 1.2w3/1/20052/22/2005WINTER QUARTER REVIEW
9 4.4w5/9/20054/8/2005PROTOTYPING
10 2.2w5/23/20055/9/2005TESTING & VERIFICATION
11 2.2w6/6/20055/23/2005FINAL REVIEW &OPTIMIZATION
12 2w6/10/20055/30/2005FINAL PROJECTPRESENTATION
Existing sizing techniques
Laser – Detector Systems
• Laser passes through spray
• Photodetectors gather scattered light
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
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
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
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
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
Focal length adjustment
• Dual lens system allows for focus adjustment
• Fine adjustment of rear lens necessary
Viewing angle must be adjustable
• Optics system will be inserted above spray
Viewing angle must be adjustable
• Mirror based system
• Fiber optics based system
Fiber optic imaging
Fiber bundles• Flexible• Coherent• Light entering and exiting must be parallel• Many components available
Viewing Angle Adjustment
• Bracket assembly
• Planetary gear assembly
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
Decision Matrix
Future considerations
• Optics system– Dimensions– Calibration– Depth of focus– Utilize manufacturer expertise
• Cooling system– Detailed analysis
• Thermal expansion– Material selection
Conclusion
• Existing sizing methods analyzed
• Infrared imaging confirmed as most feasible
• Major requirements established
• Possible solutions compared
• Overall concept decided
Complete Concept
Questions?