ISO 17225-4:2021 Solid biofuels — Fuel specifications and classes —Part 4: Graded wood chips

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Solid biofuels — Fuel specifications and classes —

Part 4: Graded wood chips

1 Scope

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

This document covers only wood chips, which are produced with sharp tools, and does not cover hog fuel, which is produced with blunt tools.

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 — Fuel specifications and classes — Part 1: General requirements

ISO 17827-1, Solid biofuels — Determination of particle size distribution for uncompressed fuels — Part 1: Oscillating screen method using sieves with apertures of 3,15 mm and above

ISO 18122, Solid biofuels — Determination of ash content

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

ISO 18135, Solid Biofuels — Sampling

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

chemical treatment

any treatment with chemicals other than air, water or heat

EXAMPLE Glue, paint, laminate.

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

3.2

contamination

occurrence of any undesirable matter such as chemical, physical and/or microbiological matter in the product

3.3

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.

[SOURCE: ISO 17225-1 2021, 3.2]

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 on dry basis, A [% in mass]

d

ar as received

3

BD Designation for bulk density as received [kg/m (loose volume)]

d dry (dry basis)

F Designation for amount of fines (< 3,15 mm) as determined [% in mass]

L Designation for length as received, L [mm]

M Designation for moisture content as received, M [% in mass]

ar

P Designation for particle size distribution as determined

q Designation for net calorific value as received, q [MJ/kg or kWh/kg] at constant pressure

p,net,ar

NOTE 1 1 MJ/kg equals 1 GJ/t or 0,2 778 kWh/kg (1 kWh/kg equals 1 MWh/t and 1 MWh/t is 3,6 MJ/kg). 1 g/

3 3

cm equals 1 kg/dm . 1 mg/kg equals 0,000 1 %.

NOTE 2 Designation symbols are used in combination with a number to specify property levels in Table 1. For designation of chemical properties, chemical symbols like S (sulfur), Cl (chlorine), N (nitrogen) are used and the property class is added at the end of the symbol.

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