Österreichisches Forschungsinstitut
für Chemie und Technik
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Tricky judgments – examples for
quality related problems
(Part 1: production) Philipp Koskarti
28.02.2013
BIOENERGIE
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content
 Tricky issues in the office (before the audit)
 Tricky issues within the production
 Raw material
 Removement of fines
 Internal factory production control
Basics in the office
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 ENplus handbook in current version !!!
 enplus-pellets.eu → version 3.5.2011 and version 2.0 to be
published 1 March 2013 (both English)
 enplus-pellets.at → version 1.4.2011 (German)
 enplus-pellets.de → version Januar 2012 (German)
 enplus-pellets.ch → version 28.6.2011 (German) 3.5.2011
(English) and 28.06.2011 (French)
 Question: what are the deviations between these documents?
Only language?
 Only valid master document:
enplus-pellets.eu → version 3.5.2011
 ENplus handbook version 2.0 available in April 2013
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Basics in the office
 Fake certificates and reports
 Check of certification number
 Check of certificate holder
 Check of product description
 Check of production site
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 http://www.enpluspellets.eu/production/certifiedproducers/
 http://www.ofi.at/zertifizierung/l
iste-derkonformitaetsbescheinigungen
.html
Basics in the office
Raw material
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Check of raw material

Raw material used, raw material storage and additives (if used)
ENplus-A1
ENplus-A2
• Stem wood
• Whole trees without roots
• Chemically untreated wood
residues
• Stem wood
• Logging residues
• Chemically untreated wood
residues
EN-B
• Forest, plantation and other
virgin wood
• Chemically untreated wood
residues
• Chemically untreated used
wood 1 (in some countries
Italy prohibited)
What goes in, will come out !!
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Sawdust, shavings
 Excellent !
Complies with regulations?
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 Excellent !
Raw material example
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raw material

Wood processing industry, fully
capsuled conveyor

Pure, dry, bark free wood (shavings)
without any contamination

chemically untreated wood residues
category: 1.2.1.2 acc. EN 14961-1
(without bark, coniferous)
Audit finished, lab tests done by an accredited and approved
testing body
Result of nitrogen content (db): 0,29% limit ≤ 0,30%
Question? o.k. or not o.k.???
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Raw material example
Result of nitrogen content (db): 0,29%
+/- 0,01% measurement uncertainty
Question? o.k. or not o.k.???
(still within the limit)
Check of reproducibility limit given in the standard EN 15104
+/-0,04%
Question? o.k. or not o.k.???
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Raw material example
Required improvements:
implementation of internal nitrogen content inspection
(glued laminated timber)
Documentation and reporting of the conducted
monitoring
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Chips
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Production residues
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max. class B !
Check very carefully!
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Not accepted!
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Complies with
regulations?
 Excellent, clean !
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Complies with
regulations?
No because ash of fuel
will be in pellets !!
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Removement of fines

Extremly important

Producers are aware because of customer complaints

still deficiences to be found, please check/Discuss:


locations,

Mesh wires (min. 5 mm),

Are wholes kept clean?

Sieving area big enough? => no regulations

Angle/residence time for sieves?

Air flow for vacuum systems?
At least one system necessary after cooler and one before loading or
bagging!
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Internal production control
 Water content
 Content of fines (before shipping)
 Durability
 Length
 Bulk density
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Mechanical durability
Sabe Tester
Conform?
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Mechanical durability
Self made
tumbler
Conform?
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Mechanical durability
Self made
tumbler
Conform?
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Mechanical durability
ASAETumbler
(Andritz)
Conform?
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Thank you for the kind
attention!
ofi – Österreichisches Forschungsinstitut für Chemie und Technik
Franz-Grill Str. 5, Arsenal Objekt 213
A-1030 Wien
Tel.: +43-1-7981601-970
Fax: +43-1-7981601-8