ČSN EN ISO 17225-3 - Tuhá biopaliva - Specifikace a třídy paliv - Část 3: Tříděné dřevní brikety

3.6 wood briquette

biofuel briquette (3.2) made from woody biomass (3.5) #### 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, Ad on dry basis [% in mass]

ar

as received

D

Designation for diameter as received, D [mm]

d

dry (dry basis)

DE

Designation for particle density as received [g/cm3]

L

Designation for length as received, L [mm]

M

Designation for moisture content as received on wet basis, Mar [% in mass]

q

Designation for net calorific value as received, qp,net,ar [MJ/kg or GJ/t] at constant pressure

NOTE 1 1 MJ/kg equals 1 GJ/t or 0,2778 kWh/kg (1 kWh/kg equals 1 MWh/t and 1 MWh/t is 3,6 MJ/kg or GJ/t). 1 g/cm3 equals 1 kg/dm3. 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. Specification of graded wood briquettes The specification of the wood briquettes shall be in accordance with Table 1 and Figure 1. Sampling (according to ISO 18135 or ISO 21945), sample preparation (according to ISO 14780) and analysis of the properties shall be carried out in accordance with the methods given in the standards listed in the normative references in Clause 2. Property class A1 and A2 represents virgin woods and chemically untreated wood residues. A1 represents fuels which are low in ash and nitrogen content, while class A2 has slightly higher ash and nitrogen content. Property class B allows chemically treated industrial wood by-products and residues and chemically untreated used wood.