1. PF-firing of wood
Per Lysedal
Experience feed back
From ship to storage
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2. Introduction
Operational experiences and observations from:
 Hässelby Power Station
Direct firing wood/oil (70/30) 3*115 MW thermal
 Uppsala Power Station
Indirect firing peat or coal 400 MW thermal
 Drefviken District heating plant
Indirect firing briquettized wood 82 MW thermal
 Jönköping District heating plant
Indirect firing pulverized wood 64 MW thermal
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3. Quality aspects – Pelletized & Briquttized
wood
Handling
 Moisture content and fines
 Comminution & Combustion
 Content of Bark, Hardwood
 Moisture content
 Feed size distribution
 Alkali & Chlorine content
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4. Supply and Logistics
 Identify and evaluate possible suppliers
 Identify and evaluate the transport solution
Conventional and selfunloaders
 Logistic study
Minimize storage = Minimize problems
 Requirement specification
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5. Shipping
 General aspects
Prevent contamination of the pelletized wood
Prevent water intrution
(Long time charter)
 Selfunloaders
Verify that safe operation with Pellets (Dust explosion & Fire protection) is
possible
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6. Unloading –conventional ships
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7. Unloading – Grab unloader
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8. Unloading - Feed hopper details
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9. Unloading - Feed hopper 2 details
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10. Unloading – Feed hopper 2 details
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11. Unloading – Selfunloader hopper 1
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12. Unloading – Selfunloader hopper 2
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13. Unloading – Container unloader
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14. Conveyors - General
 Risc evaluation (Fire – Dustexplosion)
Ignition mecanisms and sources
Avaliability of safety and fire protection equipment
 Ensure access for maintenance
 Passive vs active safety precautions
Don´t let the installation of safety monitoring systems dictate the design of the
material handling.
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15. Conveying - General
 Protect your system from overload!
 Enclose and Aspirate internally
 Design for a dust explosion
 Keep the Pellets dry
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16. Conveying - Belts
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17. Conveying – Flexowell Fire Incident
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18. Conveying – Flexowell fire incident
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19. Storage – Design Guide
 Minimize overall storage capacity!
Recieving, Active, Passive and Operational storage capacities
 Requirement specification
Material characteristics
 Carefully evaluate all operational modes
Fire, Dust, Environment, Helth, Operational costs…
 Homogenisation
Consider all options to reduce rapid changes in fuel feed quality
 Ensure future development possibilities
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20. Storage - Dustproblems
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21. Storage – Safety
 Aspirate internally when ever possible!
No ducts - No dust feed back components
Hässelby day silo aspiration system fire incident
Static electricty
 Design for dust explosion
Secure buildning – Light weight Pressure relife components
 Fire detection
CO-monitoring in aspiration system
Infra red monitoring
 Fire destinguishing systems
water & foam
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22. Storage - Mecanised
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