ISO 17225-2:2021 Solid biofuels — Fuel specifications and classes —Part 2: Graded wood pellets

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Solid biofuels — Fuel specifications and classes —

Part 2: Graded wood pellets

1 Scope

This document determines the fuel quality classes and specifications of graded wood pellets for non-

industrial and industrial use. This document covers only wood pellets produced from the following raw materials (see ISO 17225-1:2021, Table 1):

— 1.1 Forest, plantation and other virgin wood;

— 1.2 By-products and residues from wood processing industry;

— 1.3.1 Chemically untreated used wood.

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 — Fuel specifications and classes — Part 1: General requirements

ISO 17828, Solid biofuels — Determination of bulk density

ISO 17829, Solid Biofuels — Determination of length and diameter of pellets

ISO 17830, Solid biofuels — Particle size distribution of disintegrated pellets

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 calorific value

ISO 18134-1, Solid biofuels — Determination of moisture content — Oven dry method — Part 1: Total moisture — Reference method

ISO 18134-2, Solid biofuels — Determination of moisture content — Oven dry method — Part 2: Total moisture — Simplified method

ISO 18135, Solid Biofuels — Sampling

ISO 21404, Solid biofuels — Determination of ash melting behaviour

ISO 21945, Solid biofuels — Simplified sampling method for small scale applications

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 16559 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp

— IEC Electropedia: available at http:// www .electropedia .org/ 3.1

additive

material which has been intentionally introduced into the fuel feed stock to improve quality of fuel (e.g. combustion or durability properties), to reduce emissions or to make production more efficient

Note 1 to entry: Trace amounts of e.g. grease or other lubricants that are introduced into the fuel processing stream as part of normal mill operations are not considered as additives.

3.2

biofuel pellet

densified biofuel made with or without additives (3.1) usually with a cylindrical form, random length typically 5 mm to 40 mm and diameter up to 25 mm and broken ends, produced by compressing biomass

Note 1 to entry: Usually the biomass has been milled before densification.

Note 2 to entry: See also non-woody pellet, wood pellet and pellet from thermally treated biomass.

3.3

chemical treatment

any treatment with chemicals other than air, water or heat

EXAMPLE Glue and paint.

Note 1 to entry: Examples of chemical treatment are listed in ISO 17225-1.

3.4

coarse pellet fines

CPF

particles with a size ranging from ≥ 3,15 mm to < 5,6 mm resulting from breakage of pellets during production or handling

3.5

commercial application

facility that utilizes solid biofuel burning appliances or equipment that have similar fuel requirements as residential appliances

Note 1 to entry: Commercial applications should not be confused with industrial applications, which can utilize a much wider array of materials and have vastly different fuel requirements.

3.6

fines

F

fraction of small sized particles as defined by a specification or end-user

Note 1 to entry: In the solid biofuels standards fines are always defined as particles passing through a 3,15 mm round hole sieve.

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