NTERNATIONAL STANDARD (ISO) 2950 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXKIYHAPOIHA OPTAHI3AIIA HIO CTAHIAPTH3ALIWH.ORGANISATION INTERNATIONALE DE NORMALISATION Brown coals and lignites - Classification by types on the basis of total moisture content and tar yield Charbons bruns et lignites - Classification en types, d'apres la teneur en humidite totale et le rendement en goudron First edition - 1974-02-01 UDC 662.642.001.3 Ref. No. IS0 2950-1974 (E) 2950-1974 (E) Descriptors : coal, lignite, classification, moisture content, tars, yield. Price based: on 2 pages Not for Resale FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governimental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. StandardISO 2950 was drawn up by Technical Committee International ISO/TC 27, Solid mineral fuels, and circulated to the Member Bodies in November 1972 It has been approved by the Member Bodies of the following countries : Belgium Iran Thailand Turkey Bulgaria Italy Canada U.S.A. New Zealand Poland U.S.S.R. Czechoslovakia Portugal Yugoslavia Denmark France South Africa, Rep. of India Sweden The Member Body of the following country expressed disapproval of the document on technical grounds : Australia @ Inter national Organization for Standardization, 1974 : Printed in Switzerland vorking permitted without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 2950-1974 (E) Brown coals and lignites - Classification by types on the basis of total moisture content and tar yield 1 SCOPE AND FIELD OF APPLICATION 4 CLASSIFICATION INDICES This International Standard establishes a classification of 4.1 Division of brown coals into classes The brown coals are first divided according to their total moisture content and tar yield. moisture content, calculated on the ash-free basis, into the classes shown in table 1. Until reliable parameters for differentiation of brown and hard coals are worked out and confirmed, coals considered TABLE 1 - Class numbers of brown coal types in each country as brown, on the basis of a number of other characteristics, should be classified as brown coals Total moisture content of run-of-mine regardless of their calorific value, i.e. including the cases Class number coals on the ash-free basis when the gross calorific value of the coal in equilibrium % with air at 30 °C and 96 % relative humidity is more than 1 ≤20 24 000 kJ/kg on the ash-free basis. 2 > 20 to 30 3 > 30 to 40 2 REFERENCES 4 > 40 to 50 5 > 50 to 60 iSO/R 647, Determination of the yields .of tar, water, gas 6 > 60 to 70 and coke.residue by low temperature distillation of brown coal and lignite. 4.2 Division of brown coals into groups ISO/R 1015, Determination of moisture in brown coals The brown coais, divided into ciasses as described in 4.1, and lignites by the direct volumetric method. are then sub-divided according to their tar yield, calculated on the dry, ash-free basis, into the groups shown in table 2. ISO/R 1171, Determination of ash of solid mineral fuels. TABLE 2 -- Group numbers of brown coal types 3 PRINCIPLE Tar yield on the dry, ash-free basis Group number % Brown coals are classified in this International Standard 0 ≤10 according to the following properties : 1 > 10 to 15 a) total moisture content calculated on the ash-free 2 > 15 to 20 basis; 3 > 20 to 25 4 > 25 b) tar yield calculated on the dry, ash-free basis. Copyright International Organization for Standardizatio