PF-firing of wood

Per Lysedal

Experience feed back From ship to storage

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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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