Comparison of combustion energy of coal samples with different sulfur content

Abstract

Main textThe COOMET project 744/RU-a/18 was organized for the purpose of determination of the degree of equivalence of the national standards for combustion energy measurement. Three coal samples with different values of sulfur content (AH - 1,192 %, AL - 0,193 %, LC - 0,412 %) were used in the comparison. Six laboratories participated between July 2019 and November 2020: VNIIM, Russia; NIM, China; BelGIM, Belarus; BRML-NIM, Romania; UME, Turkey; PTB, Germany. All the participants sent their measurement reports to the coordinator. The measurement results were provided with the detailed uncertainty budgets of the participants. The reference value was determined in accordance with CIPM MRA "Guidelines for organizing, participating and reporting" and COOMET R/GM/19:2016 "COOMET Recommendation Guideline on COOMET supplementary comparison evaluation". The degree of equivalence with the reference value was calculated for each sample and laboratory. The reported results were inconsistent, thus it was found necessary to process the data using the DerSimonian-Laird method.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.The final report has been peer-reviewed and approved for publication by the CCT, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).