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Coal Flow Strategies for Electric Utilities

Coal Flow Strategies for Electric Utilities. Water is the enemy Water adheres to the surface of small particles due to cohesive forces. The water wants to stay or stick together with other similar particles Crushed Coal is a small particle and is hydrophobic

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Coal Flow Strategies for Electric Utilities

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  1. Coal Flow Strategies for Electric Utilities • Water is the enemy • Water adheres to the surface of small particles due to cohesive forces. The water wants to stay or stick together with other similar particles • Crushed Coal is a small particle and is hydrophobic • Cohesive forces allow the water to stay on the surface • Hydrophobic forces prevent water from being absorbed into the coal. • The amount of surface moisture determines • Dustiness and Flowability characteristics

  2. Coal Flow Strategies for Electric Utilities • Dustiness and Flowability • Impacted by the surface moisture In General: Surface Moisture Properties 0-4% More Dusty 4-6% Dusty & Sticky >6% More Sticky But, please remember coal characteristics vary considerably

  3. Coal Flow Strategies for Electric Utilities • Wet coal can cause major problems such as: • Loss of revenue • Derates (opportunity costs) • Competitively priced electricity (penalties) • Maintenance costs • Equipment downtime • Operational costs • Overtime work • Safety

  4. Coal Flow Strategies for Electric Utilities • Strategies to improve coal flow • Proper coal handling techniques • Proper stack out / storage techniques • Cover storage areas where possible • Particle size • Use of encapsulation agents • Material Selection • Liners and steel choices • Mechanical • Air blasting & vibratory methods • Chemically • Coal flow aids

  5. Coal Flow Strategies for Electric Utilities • Proper Coal Handling Techniques: • Stack out & storage

  6. Coal Flow Strategies for Electric Utilities • Proper Coal Handling Techniques: • Stack out & storage (problem?)

  7. Coal Flow Strategies for Electric Utilities • Proper Coal Handling Techniques: • Cover storage areas if possible

  8. Coal Flow Strategies for Electric Utilities • Proper Coal Handling Techniques: • Particle size

  9. Coal Flow Strategies for Electric Utilities • Proper Coal Handling Techniques: • Encapsulation agents

  10. Coal Flow Strategies for Electric Utilities • Proper Coal Handling Techniques: • Material Selection • Generally smoother wall surfaces result in lower wall friction. • Materials that prevent corrosion (SST, Plastics)

  11. Coal Flow Strategies for Electric Utilities • Proper Coal Handling Techniques: • Mechanical

  12. Coal Flow Strategies for Electric Utilities • Proper Coal Handling Techniques: • Chemical Aids

  13. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement • Even with all the traditional methods it may not be enough

  14. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement • Revenue Loses

  15. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement • Samples Taken / Evaluation Performed • Real Time Dosages Estimated from data

  16. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement • Typical dosages between 0.1 and 1.0lb/ton • Treatment optimized based on real-time moisture and rain data

  17. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement • Rain and coal moisture analyzed

  18. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement

  19. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement

  20. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement

  21. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement

  22. Coal Flow Strategies for Electric Utilities • Water Treatment Services Involvement

  23. Thanks

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