1、Designation:D19719Standard Test Method forSampling and Fineness Test of Pulverized Coal1This standard is issued under the fixed designation D197;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in pa
2、rentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the fine-ness by sieve analysis of coal sampled from a dry pulverizingoperation.It is not applicable to pr
3、oducts of wet milling or tofines that have clustered into an agglomerated mass.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.3 This standard does not purport to address
4、 all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in
5、accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 AST
6、M Standards:2E11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Significance and Use3.1 This test method provides a means for assisting in theevaluation of pulverizers and pulverizer systems in terms offineness specifications.It may also be used to confirm theinfluence of coal finenes
7、s on combustion performance and toevaluate carbon loss.By consent among interested parties,itmay be used for evaluation of coal fineness in preparation,pneumatic transfer systems,etc.4.Apparatus4.1 Sample ContainersHeavy vapor impervious bags,properly sealed,or noncorroding cans such as those with a
8、nairtight,friction top or screw top sealed with a rubber gasketand pressure sensitive tape for use in storage and transport ofthe laboratory sample.Glass containers sealed with rubbergaskets may be used,but care must be taken to avoid breakagein transport.4.2 Drying OvenA device for passing slightly
9、 heated airover the sample.The oven should be capable of maintaining atemperature of 10 C to 15 C(18 F to 27 F)above roomtemperature with a maximum oven temperature of 40 C(104 F).Air changes should be at the rate of 1 L min to4 L min.4.3 Sieves,square-hole,woven-wire cloth conforming toSpecificatio
10、n E11:2.36 mm(No.8 USA Standard)1.18 mm(No.16 USA Standard)600 m(No.30 USA Standard)300 m(No.50 USA Standard)150 m(No.100 USA Standard)75 m(No.200 USA Standard)45 m(No.325 USA Standard)The sieve frames shall be 203 mm(8 in.)in diameter,andthe height of the sieve from the top of the frame to the clot
11、hshall be either 50.8 mm(2 in.)or 25.4 mm(1 in.).Selection ofspecific sizes is optional,depending on the objective of the test.4.3.1 Since the finer mesh sieves in particular are suscep-tible to damage by distortion resulting from undue pressure,accidental scraping with hard brushes,etc.,each sieve
12、shouldbe closely inspected and discarded if it shows evidence ofdamage.4.4 Mechanical Sieving MachineThe mechanical sievingmachine shall be designed to provide both a circular motionand a tapping action.It shall be designed to accept an assemblyof vertically nested circular sieves as described in 4.
13、3.Themachine action shall be such that results as described inSection 7 are obtained within the allotted time frame.Actionshould not be sufficiently severe to generate new fines byparticle degradation.To facilitate the sieving operation,acontrol switch device with timer is recommended.Otherequipment
14、 designs may be used provided the results arecomparable.1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.07 on PhysicalCharacteristics of Coal.Current edition approved Nov.1,2019.Published December 2019.Originallya
15、pproved in 1924.Last previous edition approved in 2012 as D197 87(2012).DOI:10.1520/D0197-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summa
16、ry page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.5 Balance,LaboratoryApproximately 1000 g capaci
