ISO 17225-3:2021 Solid biofuels — Fuel specifications and classes —Part 3: Graded wood briquettes

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Solid biofuels — Fuel specifications and classes —

Part 3: Graded wood briquettes

1 Scope

This document determines the fuel quality classes and specifications of graded wood briquettes. This document covers only wood briquettes 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

NOTE Thermally treated biomass briquettes (e.g. torrefied briquettes) 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 —Fuels specifications and classes — Part 1: – General requirements

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 18847, Solid biofuels — Determination of particle density of pellets and briquettes

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://w ww .iso .org/ obp

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

additive

material which has been intentionally introduced into the fuel feed stock to improve quality of fuel (e.g. combustion properties or durability), 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 briquette

densified biofuel made with or without additives in pre-determined geometric form with at least two dimensions (length, width, height) of more than 25 mm, produced by compressing 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

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 may have somewhat different fuel requirements.

3.5

woody biomass

biomass originating from trees, bushes and shrubs together with their fruit, leaves and needles inherent to the biomass

Note 1 to entry: This definition includes forest, plantation and other virgin wood, wood processing industry by-

products and residues, and used wood

3.6

wood briquette

biofuel briquette (3.2) made from woody biomass (3.5)

4 Symbols and abbreviated terms

The symbols and abbreviated terms used in this document conform with the SI system of units as far as possible.

A Designation for ash content, A on dry basis [% in mass]

d

ar as received

D Designation for diameter as received, D [mm]

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