Solid biofuels -- Fuel specifications and classes

This document determines the fuel quality classes and specifications of graded non-woody pellets. This document covers only non-woody pellets produced from the following raw material (see ISO 17225‑1:2021, Table 1): —   2 Herbaceous biomass —   3 Fruit biomass —   4 Aquatic biomass —   5 Biomass blends and mixtures NOTE 1   Herbaceous biomass originates from plants that have a non-woody stem and which die back at the end of the growing season. It includes grains or seeds crops from food production or processing industry and their by-products such as cereals. NOTE 2   Blends and mixtures include blends and mixtures from the main origin-based solid biofuel groups woody biomass, herbaceous biomass, fruit biomass and aquatic biomass. Blends are intentionally mixed biofuels, whereas mixtures are unintentionally mixed biofuels. The origin of the blend and mixture is to be described using ISO 17225‑1:2021, Table 1. If solid biofuel blend or mixture contains chemically treated material it shall be stated. NOTE 3   Thermally treated biomass pellets (e.g. torrefied pellets) are not included in the scope of this document.

Biocombustibles solides -- Classes et spécifications des combustibles

Le présent document détermine les classes et spécifications de qualité du combustible pour les granulés d'origine agricole. Le présent document couvre uniquement les granulés d'origine agricole produits à partir des matières premières suivantes (voir ISO 17225-1:2021, Tableau 1): —   2 Biomasse herbacée; —   3 Biomasse fruitière; —   4 Biomasse aquatique; —   5 Assortiments et mélanges de biomasses. NOTE 1   La biomasse herbacée provient de plantes à tiges non ligneuses et qui se fanent à la fin de la saison de croissance. Cela comprend la culture de graines ou de semences issues de l'industrie de production ou de transformation alimentaire et leurs co-produits tels que les céréales. NOTE 2   Le groupe Assortiments et mélanges comprend les assortiments et mélanges issus des principaux groupes de biocombustibles solides provenant des biomasses ligneuse, herbacée, fruitière et aquatique. Les assortiments résultent du mélange intentionnel de différents biocombustibles, tandis que les mélanges résultent d'une association non intentionnelle de différents biocombustibles. L'origine de l'assortiment et du mélange doit être décrite à l'aide du Tableau 1 de l'ISO 17225-1:2021. Si l'assortiment ou le mélange de biocombustibles solides contient des matériaux traités chimiquement, cela doit être mentionné. NOTE 3   Les granulés de biomasse traités thermiquement (par exemple, les granulés torréfiés) ne sont pas couverts par le présent document.

General Information

Status
Published
Publication Date
04-Jul-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
12-May-2021
Completion Date
11-May-2021
Ref Project

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INTERNATIONAL ISO
STANDARD 17225-6
Second edition
2021-07
Solid biofuels — Fuel specifications
and classes —
Part 6:
Graded non-woody pellets
Biocombustibles solides — Classes et spécifications des
combustibles —
Partie 6: Classes de granulés d'origine agricole
Reference number
ISO 17225-6:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 17225-6:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 17225-6:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols and abbreviated terms ........................................................................................................................................................... 3

5 Specification of graded non-woody pellets ............................................................................................................................... 3

Bibliography ................................................................................................................................................................................................................................ 7

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 17225-6:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 238, Solid biofuels.

This second edition cancels and replaces the first edition (ISO 17225-6:2014), which has been technically

revised. The main changes compared to the previous edition are as follows:
— Arsenic and chlorine values changed in Class B
— Ash melting behaviour added as an informative property

— Specification of pellets produced from cereal straw, miscanthus and reed canary grass has been

included in Table 1.
A list of all parts in the ISO 17225 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 17225-6:2021(E)
Introduction

The objective of the ISO 17225 series is to provide unambiguous and clear classification principles

for solid biofuels and to serve as a tool to enable efficient trading of biofuels and to enable good

understanding between seller and buyer as well as a tool for communication with equipment

manufacturers. It will also facilitate authority permission procedures and reporting.

This document supports the use of graded non-woody pellets in specially designed appliances for

residential, small commercial and public buildings as well as industrial energy generation applications,

which require classified pellet quality.

The residential, small commercial and public building appliances require higher quality fuel for the

following reasons:

— Small-scale equipment does not usually have advanced controls and flue gas cleaning

— Appliances are not generally managed by professional heating engineers
— Appliances are often located in residential and populated districts

Non-woody pellets have high ash, chlorine (Cl), nitrogen (N) and sulfur (S) content and major element

contents, so non-woody pellets are recommended to be used in appliances, which are specially designed

or adjusted for this kind of pellet.

In general, non-woody biomass materials have higher content of ash forming elements and produces

ashes with lower melting temperature compared to most woody biomass. Be aware that herbaceous

or fruit biomass may influence the fuel ash composition differently depending on growth and soil

conditions. This may result in fouling, slagging and corrosion inside boilers. These problems are

especially related to materials that have high content of potassium (K) and silicate (Si) and low content

of calcium (Ca). The content of chlorine (Cl), phosphate (P) and potassium (K) in the material may form

chlorides and phosphorous and other chemical compounds resulting in high hydrochloric emissions

and chemically active ash causing corrosion. Special attention should be paid to the risk of corrosion in

small and medium scale boilers and flue gas systems. Blending with woody biomass can improve the

combustion characteristics.
NOTE For individual contracts ISO 17225-1 can be used.

Although this document may be obtained separately, it requires a general understanding of the

standards based on and supporting ISO 17225-1. It is recommended to obtain and use ISO 17225-1 in

conjunction with this document.
© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 17225-6:2021(E)
Solid biofuels — Fuel specifications and classes —
Part 6:
Graded non-woody pellets
1 Scope

This document determines the fuel quality classes and specifications of graded non-woody pellets.

This document covers only non-woody pellets produced from the following raw material (see

ISO 17225-1:2021, Table 1):
— 2 Herbaceous biomass
— 3 Fruit biomass
— 4 Aquatic biomass
— 5 Biomass blends and mixtures

NOTE 1 Herbaceous biomass originates from plants that have a non-woody stem and which die back at the end

of the growing season. It includes grains or seeds crops from food production or processing industry and their

by-products such as cereals.

NOTE 2 Blends and mixtures include blends and mixtures from the main origin-based solid biofuel groups

woody biomass, herbaceous biomass, fruit biomass and aquatic biomass.

Blends are intentionally mixed biofuels, whereas mixtures are unintentionally mixed biofuels. The

origin of the blend and mixture is to be described using ISO 17225-1:2021, Table 1.

If solid biofuel blend or mixture contains chemically treated material it shall be stated.

NOTE 3 Thermally treated biomass pellets (e.g. torrefied pellets) are not included in the scope of this

document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 14780, Solid biofuels — Sample preparation
ISO 16559, Solid biofuels — Terminology, definitions and descriptions

ISO 16948, Solid biofuels — Determination of total content of carbon, hydrogen and nitrogen

ISO 16968, Solid biofuels — Determination of minor elements

ISO 16994, Solid biofuels — Determination of total content of sulfur and chlorine

ISO 17225-1:2021, Solid biofuels —Solid biofuels – Part 1 – General requirements
ISO 17828, Solid biofuels — Determination of bulk density
ISO 17829, Solid Biofuels — Determination of length and diameter of pellets
© ISO 2021 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 17225-6:2021(E)

ISO 17831-1, Solid biofuels — Determination of mechanical durability of pellets and briquettes — Part 1:

Pellets
ISO 18122, Solid biofuels — Determination of ash content
ISO 18125, Solid biofuels — Determination of
...

NORME ISO
INTERNATIONALE 17225-6
Deuxième édition
2021-07
Biocombustibles solides — Classes et
spécifications des combustibles —
Partie 6:
Classes de granulés d'origine agricole
Solid biofuels — Fuel specifications and classes —
Part 6: Graded non-woody pellets
Numéro de référence
ISO 17225-6:2021(F)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 17225-6:2021(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2021

Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette

publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,

y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut

être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.

ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii © ISO 2021 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 17225-6:2021(F)
Sommaire Page

Avant-propos ..............................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Domaine d'application ................................................................................................................................................................................... 1

2 Références normatives ................................................................................................................................................................................... 1

3 Termes et définitions ....................................................................................................................................................................................... 2

4 Symboles et abréviations ............................................................................................................................................................................. 3

5 Spécification des classes des granulés d'origine agricole ......................................................................................... 4

Bibliographie .............................................................................................................................................................................................................................. 7

© ISO 2021 – Tous droits réservés iii
---------------------- Page: 3 ----------------------
ISO 17225-6:2021(F)
Avant-propos

L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes

nationaux de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est

en général confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude

a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,

gouvernementales et non gouvernementales, en liaison avec l'ISO participent également aux travaux.

L'ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui

concerne la normalisation électrotechnique.

Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier de prendre note des différents

critères d'approbation requis pour les différents types de documents ISO. Le présent document a été

rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www

.iso .org/ directives).

L'attention est attirée sur le fait que certains des éléments du présent document peuvent faire l'objet de

droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de

brevets reçues par l'ISO (voir www .iso .org/ brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l'intention des utilisateurs et ne sauraient constituer un

engagement.

Pour une explication de la nature volontaire des normes, la signification des termes et expressions

spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion

de l'ISO aux principes de l'Organisation mondiale du commerce (OMC) concernant les obstacles

techniques au commerce (OTC), voir le lien suivant: www .iso .org/ iso/ fr/ avant -propos.

Le présent document a été élaboré par le comité technique ISO/TC 238, Biocombustibles solides.

Cette deuxième édition annule et remplace la première édition (ISO 17225-6:2014), qui a fait l'objet

d'une révision technique. Les principales modifications par rapport à l'édition précédente sont les

suivantes:
— modification des valeurs de l'arsenic et du chlore dans la classe B;

— ajout du comportement de fusibilité des cendres en tant que propriété informative;

— inclusion de la spécification des granulés produits à partir de paille de céréales, de Miscanthus et de

Phalaride dans le Tableau 1.

Une liste de toutes les parties de la série ISO 17225 se trouve sur le site web de l'ISO.

Il convient que l'utilisateur adresse tout retour d'information ou toute question concernant le présent

document à l'organisme national de normalisation de son pays. Une liste exhaustive desdits organismes

se trouve à l'adresse www .iso .org/ fr/ members .html.
iv © ISO 2021 – Tous droits réservés
---------------------- Page: 4 ----------------------
ISO 17225-6:2021(F)
Introduction

L'objectif de la série de normes ISO 17225 est de fournir des principes clairs et univoques de

classification des biocombustibles solides, de servir d'outil pour permettre des échanges commerciaux

efficaces et une bonne compréhension entre vendeur et acheteur, ainsi que de moyen de communication

avec les fabricants de matériel. Elle facilite également les procédures d'autorisation administrative et

l'établissement de rapports.

Le présent document couvre l'utilisation de classes de granulés d'origine agricole dans les appareils

spécialement conçus pour les habitations, les petits commerces et les bâtiments publics, ainsi que dans

les applications de génération d'énergie industrielle, qui requièrent une qualité de granulés classifiée.

Les appareils utilisés dans les habitations, les petits commerces et les bâtiments publics nécessitent un

combustible de haute qualité pour les raisons suivantes:

— les équipements à petite échelle ne disposent habituellement pas de commandes sophistiquées ni

d'épurateurs de fumées;
— en général, ils ne sont pas gérés par un spécialiste du chauffage;
— ils sont souvent situés dans des zones résidentielles et habitées.

Les granulés d'origine agricole possèdent une haute teneur en cendres, en chlore (Cl), en azote (N) et en

soufre (S) et des teneurs élevées en éléments majeurs, ainsi il est recommandé d'utiliser des granulés

d'origine agricole dans des appareils spécialement conçus ou ajustés pour ce type de granulés.

En général, les matériaux de biomasse d'origine agricole ont une plus grande teneur en éléments

formant des cendres et produisent des cendres avec une température de fusion plus faible comparée

à la plupart des matériaux de biomasse ligneuse. À noter que la biomasse herbacée ou fruitière peut

influer de manière différente sur la composition des cendres du combustible, selon les conditions de

croissance ou l'état du sol. Cela peut provoquer un encrassement, une formation de mâchefer et une

corrosion dans les chaudières. Ces problèmes sont particulièrement associés aux matériaux ayant

une haute teneur en potassium (K) et en silicate (Si) et une faible teneur en calcium (Ca). La teneur en

chlore (Cl), en phosphore (P) et en potassium (K) dans le matériau peut former des chlorures et des

phosphates ainsi que d'autres composés chimiques conduisant à des émissions d'acide chlorhydrique

élevées et des cendres chimiquement actives générant de la corrosion. Il convient de veiller au risque de

corrosion dans les chaudières de petite et moyenne échelles ainsi que dans les systèmes d'évacuation

de gaz. L'assortiment avec de la biomasse ligneuse peut améliorer les caractéristiques de combustion.

NOTE Pour des contrats individuels, l'ISO 17225-1 peut être utilisée.

Bien que le présent document puisse être obtenu séparément, il nécessite une compréhension globale

des normes basées sur l'ISO 17225-1 et de celles qui la complètent. Il est recommandé de se procurer

l'ISO 17225-1 et de l'utiliser conjointement au présent document.
© ISO 2021 – Tous droits réservés v
---------------------- Page: 5 ----------------------
NORME INTERNATIONALE ISO 17225-6:2021(F)
Biocombustibles solides — Classes et spécifications des
combustibles —
Partie 6:
Classes de granulés d'origine agricole
1 Domaine d'application

Le présent document détermine les classes et spécifications de qualité du combustible pour les granulés

d'origine agricole. Le présent document couvre uniquement les granulés d'origine agricole produits à

partir des matières premières suivantes (voir ISO 17225-1:2021, Tableau 1):
— 2 Biomasse herbacée;
— 3 Biomasse fruitière;
— 4 Biomasse aquatique;
— 5 Assortiments et mélanges de biomasses.

NOTE 1 La biomasse herbacée provient de plantes à tiges non ligneuses et qui se fanent à la fin de la saison

de croissance. Cela comprend la culture de graines ou de semences issues de l'industrie de production ou de

transformation alimentaire et leurs co-produits tels que les céréales.

NOTE 2 Le groupe Assortiments et mélanges comprend les assortiments et mélanges issus des principaux

groupes de biocombustibles solides provenant des biomasses ligneuse, herbacée, fruitière et aquatique.

Les assortiments résultent du mélange intentionnel de différents biocombustibles, tandis que les

mélanges résultent d'une association non intentionnelle de différents biocombustibles. L'origine de

l'assortiment et du mélange doit être décrite à l'aide du Tableau 1 de l'ISO 17225-1:2021.

Si l'assortiment ou le mélange de biocombustibles solides contient des matériaux traités chimiquement,

cela doit être mentionné.

NOTE 3 Les granulés de biomasse traités thermiquement (par exemple, les granulés torréfiés) ne sont pas

couverts par le présent document.
2 Références normatives

Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie de leur

contenu, des exigences du présent document. Pour les références datées, seule l'édition citée s'applique.

Pour les références non datées, la dernière édition du document de référence s'applique (y compris les

éventuels amendements).
ISO 14780, Biocombustibles solides — Préparation des échantillons
ISO 16559, Biocombustibles solides — Terminologie, définitions et descriptions

ISO 16948, Biocombustibles solides — Détermination de la teneur totale en carbone, hydrogène et azote

ISO 16968, Biocombustibles solides — Détermination des éléments mineurs

ISO 16994, Biocombustibles solides — Détermination de la teneur totale en soufre et en chlore

© ISO 2021 – Tous droits réservés 1
---------------------- Page: 6 ----------------------
ISO 17225-6:2021(F)

ISO 17225-1, Biocombustibles solides — Classes et spécifications des combustibles — Partie 1: Exigences

générales

ISO 17828, Biocombustibles solides — Détermination de la masse volumique apparente

ISO 17829, Biocombustibles solides — Détermination de la longueur et du diamètre des granulés

ISO 17831-1, Biocombustibles solides — Détermination de la résistance mécanique des granulés et des

briquettes — Partie 1: Granulés

ISO 18122, Biocombustibles solides — Méthode de détermination de la teneur en cendres

ISO 18125, Biocombustibles solides — Détermination du pouvoir calorifique

ISO 18134-1, Biocombustibles solides — Dosage de la teneur en humidité — Méthode de séchage à l'étuv

...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 17225-6
ISO/TC 238
Solid biofuels — Fuel specifications
Secretariat: SIS
and classes —
Voting begins on:
2021-03-16
Part 6:
Voting terminates on:
Graded non-woody pellets
2021-05-11
Biocombustibles solides — Classes et spécifications des
combustibles —
Partie 6: Classes de granulés d'origine agricole
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 17225-6:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 17225-6:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 17225-6:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols and abbreviated terms ........................................................................................................................................................... 3

5 Specification of graded non-woody pellets ............................................................................................................................... 3

Bibliography ................................................................................................................................................................................................................................ 7

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 17225-6:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 238, Solid biofuels.

This second edition cancels and replaces the first edition (ISO 17225-6:2014), which has been technically

revised. The main changes compared to the previous edition are as follows:
— Arsenic and chlorine values changed in Class B
— Ash melting behaviour added as an informative property

— Specification of pellets produced from cereal straw, miscanthus and reed canary grass has been

included in Table 1.
A list of all parts in the ISO 17225 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
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ISO/FDIS 17225-6:2021(E)
Introduction

The objective of the ISO 17225 series is to provide unambiguous and clear classification principles

for solid biofuels and to serve as a tool to enable efficient trading of biofuels and to enable good

understanding between seller and buyer as well as a tool for communication with equipment

manufacturers. It will also facilitate authority permission procedures and reporting.

This document supports the use of graded non-woody pellets in specially designed appliances for

residential, small commercial and public buildings as well as industrial energy generation applications,

which require classified pellet quality.

The residential, small commercial and public building appliances require higher quality fuel for the

following reasons:

— Small-scale equipment does not usually have advanced controls and flue gas cleaning

— Appliances are not generally managed by professional heating engineers
— Appliances are often located in residential and populated districts

Non-woody pellets have high ash, chlorine (Cl), nitrogen (N) and sulfur (S) content and major element

contents, so non-woody pellets are recommended to be used in appliances, which are specially designed

or adjusted for this kind of pellet.

In general, non-woody biomass materials have higher content of ash forming elements and produces

ashes with lower melting temperature compared to most woody biomass. Be aware that herbaceous

or fruit biomass may influence the fuel ash composition differently depending on growth and soil

conditions. This may result in fouling, slagging and corrosion inside boilers. These problems are

especially related to materials that have high content of potassium (K) and silicate (Si) and low content

of calcium (Ca). The content of chlorine (Cl), phosphate (P) and potassium (K) in the material may form

chlorides and phosphates and other chemical compounds resulting in high hydrochloric emissions and

chemically active ash causing corrosion. Special attention should be paid to the risk of corrosion in

small and medium scale boilers and flue gas systems. Blending with woody biomass can improve the

combustion characteristics.
NOTE For individual contracts ISO 17225-1 can be used.

Although this document may be obtained separately, it requires a general understanding of the

standards based on and supporting ISO 17225-1. It is recommended to obtain and use ISO 17225-1 in

conjunction with this document.
© ISO 2021 – All rights reserved v
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 17225-6:2021(E)
Solid biofuels — Fuel specifications and classes —
Part 6:
Graded non-woody pellets
1 Scope

This document determines the fuel quality classes and specifications of graded non-woody pellets.

This document covers only non-woody pellets produced from the following raw material (see

ISO 17225-1:2021, Table 1):
— 2 Herbaceous biomass
— 3 Fruit biomass
— 4 Aquatic biomass
— 5 Biomass blends and mixtures

NOTE 1 Herbaceous biomass originates from plants that have a non-woody stem and which die back at the end

of the growing season. It includes grains or seeds crops from food production or processing industry and their

by-products such as cereals.

NOTE 2 Blends and mixtures include blends and mixtures from the main origin-based solid biofuel groups

woody biomass, herbaceous biomass, fruit biomass and aquatic biomass.

Blends are intentionally mixed biofuels, whereas mixtures are unintentionally mixed biofuels. The

origin of the blend and mixture is to be described using ISO 17225-1:2021, Table 1.

If solid biofuel blend or mixture contains chemically treated material it shall be stated.

NOTE 3 Thermally treated biomass pellets (e.g. torrefied pellets) are not included in the scope of this

document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 14780, Solid biofuels — Sample preparation
ISO 16559, Solid biofuels — Terminology, definitions and descriptions

ISO 16948, Solid biofuels — Determination of total content of carbon, hydrogen and nitrogen

ISO 16968, Solid biofuels — Determination of minor elements

ISO 16994, Solid biofuels — Determination of total content of sulfur and chlorine

ISO 17225-1, Solid biofuels —Solid biofuels – Part 1 – General requirements
ISO 17828, Solid biofuels — Determination of bulk density
ISO 17829, Solid Biofuels — Determination of length and diameter of pellets
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