wood pellet conversion - fuel storage and handling
TRANSCRIPT
PF-firing of wood
Per Lysedal
Experience feed back From ship to storage
09/06/2015
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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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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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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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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Unloading –conventional ships
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Unloading – Grab unloader
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Unloading - Feed hopper details
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Unloading - Feed hopper 2 details
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Unloading – Feed hopper 2 details
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Unloading – Selfunloader hopper 1
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Unloading – Selfunloader hopper 2
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Unloading – Container unloader
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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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Conveying - General
Protect your system from overload!
Enclose and Aspirate internally
Design for a dust explosion
Keep the Pellets dry
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Conveying - Belts
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Conveying – Flexowell Fire Incident
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Conveying – Flexowell fire incident
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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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Storage - Dustproblems
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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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Storage - Mecanised
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