1、BSI Standards PublicationBS ISO 11722:2013Solid mineral fuels Hard coal Determination of moisturein the general analysis testsample by drying in nitrogenBS ISO 11722:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 11722:2013. Itsupersedes BS 1016-104.1:199
2、9 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/16, Solid mineral fuels.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a
3、contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 80382 6ICS 73.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the auth
4、ority of theStandards Policy and Strategy Committee on 31 July 2013.Amendments issued since publicationDate Text affectedBS ISO 11722:2013 ISO 2013Solid mineral fuels Hard coal Determination of moisture in the general analysis test sample by drying in nitrogenCombustibles minraux solides Houille Dte
5、rmination de lhumidit de lchantillon pour analyse par dessiccation en atmosphre dazoteINTERNATIONAL STANDARDISO11722Second edition2013-07-01Reference numberISO 11722:2013(E)BS ISO 11722:2013ISO 11722:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unle
6、ss otherwise specified, 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 on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the a
7、ddress below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 11722:2013ISO 11722:2013(E) ISO 2013 All rights reserved iiiContents P
8、ageForeword ivIntroduction v1 Scope . 12 Normatives references . 13 Terms and definitions . 14 Principle 15 Reagent . 16 Apparatus . 17 Preparation of the test sample . 28 Procedure. 29 Expression of results 210 Precision . 210.1 Repeatability limit 210.2 Reproducibility limit 211 Test report . 3Ann
9、ex A (informative) Example of a suitable oven 4BS ISO 11722:2013ISO 11722:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
10、ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates
11、 closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval crite
12、ria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this document may be the subject of patent
13、 rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this
14、document is information given for the convenience of users and does not constitute an endorsement.The committee responsible for this document is ISO/TC 27, Solid mineral fuels, Subcommittee SC 5, Methods of analysis.This second edition cancels and replaces the first edition (ISO 11722:1999), of whic
15、h it constitutes a minor revision.iv ISO 2013 All rights reservedBS ISO 11722:2013ISO 11722:2013(E)IntroductionThe determination of the moisture in the general analysis test sample is required to correct the results of certain analytical determinations, e.g. volatile matter and hydrogen, for the eff
16、ect of water in the determination and to allow all determinations to be corrected to dry basis.Since hard coal is hygroscopic, its moisture will vary with change of humidity of the atmosphere and the moisture in the general analysis test sample should therefore be determined whenever portions are we
17、ighed out for other analytical determinations. If test portions for several analytical determinations are weighed out at the same time, a single simultaneous moisture determination will suffice to correct those analyses. ISO 2013 All rights reserved vBS ISO 11722:2013BS ISO 11722:2013Solid mineral f
18、uels Hard coal Determination of moisture in the general analysis test sample by drying in nitrogen1 ScopeThis International Standard specifies a method for determining the moisture in the general analysis test sample of hard coal by drying in nitrogen.2 Normatives referencesThe following documents,
19、in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1213-2, Solid mineral fuels V
20、ocabulary Part 2: Terms relating to sampling, testing and analysis3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 1213-2 apply.4 PrincipleA known mass of the coal is heated in a stream of nitrogen at a temperature between 105 C and 110 C and maintaine
21、d at this temperature until it is constant in mass. The moisture content is calculated from the loss in mass of the coal.5 ReagentNitrogen, moisture-free, having an volume fraction of oxygen of less than 30 l/l.Commercially available nitrogen with a water content of less than 5 l/l does not require
22、further drying.6 Apparatus6.1 Analytical balance, capable of weighing to the nearest 0,1 mg.6.2 Oven, capable of being controlled at a temperature of 105 C to 110 C and with provision for the nitrogen to pass through it at a flow-rate of approximately 15 times the oven volume per hour and of lowest
23、practical volume, i.e. minimum free space.NOTE An example of a suitable oven is given in Annex A.6.3 Weighing dish, shallow, of glass or of corrosion-resistant metal, with well-fitting covers, of such a size that the coal layer does not exceed 0,20 g/cm2.6.4 Cooling vessel, e.g. desiccator, without
24、desiccant, containing a metal plate, preferably of aluminium or copper. The vessel may be provided with a means to pass nitrogen through it during the cooling period.INTERNATIONAL STANDARD ISO 11722:2013(E) ISO 2013 All rights reserved 1BS ISO 11722:2013ISO 11722:2013(E)7 Preparation of the test sam
25、pleThe coal used for the determination of mass fraction moisture is the general analysis test sample. Ensure that the mass fraction moisture in the sample is in equilibrium with the laboratory atmosphere, exposing it, if necessary, in a thin layer for the minimum time required to achieve equilibrium
26、.Before commencing the determination, thoroughly mix the equilibrated test sample for at least 1 min, preferably by mechanical means.8 ProcedureWeigh, on an analytical balance (6.1), a clean, dry, empty weighing dish (6.3) with its cover to the nearest 0,1 mg. Add 1 g 0,1 g of the coal sample in an
27、even layer and reweigh. Heat the uncovered dish in the oven (6.2) at 105 C to 110 C for at least 60 min while passing nitrogen through at approximately 15 times the oven volume per hour. Do not open the oven door during the drying period.When the drying period is complete, remove the dish with the d
28、ried sample from the oven and replace the cover immediately. If the size of the oven allows this, replace the cover while the dish is still in the oven. Allow the dish to cool on a thick metal plate for 10 min. At the end of the 10 min cooling period, transfer the dish to a cooling vessel (6.4) and
29、allow to cool to room temperature. As soon as room temperature is reached, reweigh to the nearest 0,1 mg.NOTE If a cooling vessel with nitrogen flow is used, the dish can be transferred directly without cooling on a metal plate.If there is any doubt that drying is not complete, reheat at 105 C to 11
30、0 C for further 30 min period until any change in mass does not exceed 1 mg.9 Expression of resultsThe mass fraction of moisture in the hard coal as analysed, wM, in percent, is given by the following formula:wmmmmM=2321100 wherem1is the mass, in grams, of empty dish plus cover;m2is the mass, in gra
31、ms, of dish plus cover plus coal before heating;m3is the mass, in grams, of dish plus cover plus coal after heating.Report the result, as the mean of duplicate determinations, to the nearest 0,1 % mass fraction.10 Precision10.1 Repeatability limitThe results of duplicate determinations (carried out
32、over a short period of time, but not simultaneously) in the same laboratory, by the same operator, with the same apparatus on two representative portions taken from the same analysis sample, should not differ by more than the values shown in Table 1.10.2 Reproducibility limitSince the humidity condi
33、tions in different laboratories vary, it is not practical to quote a limiting value for reproducibility.2 ISO 2013 All rights reservedBS ISO 11722:2013ISO 11722:2013(E)Table 1 PrecisionMass fraction of moisture %Maximum acceptable differences between results Repeatability limitLess than 5 0,10Equal
34、to or more than 5 0,1511 Test reportThe test report shall include the following information:a) reference to this International Standard, i.e. ISO 11722;b) the identification of the sample tested;c) the results of the determination. ISO 2013 All rights reserved 3BS ISO 11722:2013ISO 11722:2013(E)Anne
35、x A (informative) Example of a suitable ovenAn example of a suitable oven for the determination of moisture in the general analysis test sample is given in Figure A.1. It is a so-called “minimum free space oven” which minimizes the amount of nitrogen needed.However, any other type of oven which meet
36、s the criteria given in 6.2 will suffice for this International Standard.4 ISO 2013 All rights reservedBS ISO 11722:2013ISO 11722:2013(E)Dimensions in millimetresKey1 nitrogen outlet 4 copper gauze mesh openings 0,252 space for heating element 5 nitrogen inlet3 tube for temperature-measuring deviceF
37、igure A.1 Example of a minimum free space oven ISO 2013 All rights reserved 5BS ISO 11722:2013ISO 11722:2013(E) ISO 2013 All rights reservedICS 73.040Price based on 5 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-relate
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