ISO INTERNATIONAL STANDARD 1928 Fourth edition 2020-10 Coal and coke - Determination of gross calorific value Charbon et coke-Détermination dupouvoircalorifique superieur Referencenumber IS0 1928:2020(E) ISO @ISO 2020 IS0 1928:2020(E) COPYRIGHTPROTECTEDDOCUMENT @IS02020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's memberbody in the country ofthe requester. ISO copyright office CP 40i : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22.749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS0 1928:2020(E) Contents Page Foreword ..V 1 Scope ..1 2 Normative references 3 Terms, definitionsand symbols 3.1 Terms and definitions .2 3.2 Symbols 4 Principle 4.1 Gross calorific value .6 4.2 Net calorific value. Reagents 6 Apparatus 7 Preparation of test sample ..12 8 Calorimetric procedure .13 8.1 General .13 8.2 Preparing the combustion vessel for measurement ..15 8.2.1 General procedure .15 Using a combustion aid 8.2.2 .15 8.3 Assembling the calorimeter. .15 8.4 Combustionreactionandtemperaturemeasurements ..16 8.5 Analysis of products of combustion. ..16 8.6 Correctedtemperaturerise ..17 8.6.1 Observed temperature rise, t-t; .17 8.6.2 Isoperibol and static-jacket calorimeters. .17 8.6.3 Adiabaticcalorimeters .18 8.6.4 Thermometer corrections .19 8.7 Referencetemperature .19 Calibration .19 9 9.1 Principle. ..19 9.2 Calibrant ..19 9.2.1 Certification conditions ..19 9.2.2 Calibration conditions .19 9.3 Valid working range of the effective heat capacity .20 9.4 Ancillarycontributions .20 9.5 Calibration procedure. 21 9.6 Calculation of effective heat capacityfor the individual test. 21 9.6.1 Constant mass-of-calorimeter-water basis. 21 9.6.2 Constanttotal-calorimeter-mass basis. 22 9.7 Precision of the mean value of the effective heat capacity 23 Constantvalue of .23 9.7.1 9.7.2 asafunctionoftheobservedtemperaturerise .23 9.8 Redetermination oftheeffectiveheatcapacity .23 10 Gross calorific value. .24 10.1 General 24 10.2 Coal combustions 24 10.3 Coke combustions .24 10.4 Calculation of gross calorific value .25 10.4.1 General .25 10.4.2 Constant mass-of-calorimeter-waterbasis 25 10.4.3 Constant total-calorimeter-mass basis. .26 10.4.4 as afunctionoftheobservedtemperaturerise 26 10.5 Expression of results. 27 @IS0 2020 -All rights reserved iii