ImageVerifierCode 换一换
格式:PDF , 页数:10 ,大小:239.78KB ,
资源ID:514520      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-514520.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ASTM D3302 D3302M-2017 Standard Test Method for Total Moisture in Coal《煤中总水分的标准试验方法》.pdf)为本站会员(postpastor181)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ASTM D3302 D3302M-2017 Standard Test Method for Total Moisture in Coal《煤中总水分的标准试验方法》.pdf

1、Designation: D3302/D3302M 17Standard Test Method forTotal Moisture in Coal1This standard is issued under the fixed designation D3302/D3302M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision. A number in par

2、entheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the measurement of the totalmoisture in coal as it exists at the site, at the time, and underthe conditions it is sampled. I

3、t is applicable to coals as mined,processed, shipped, or used in normal commercial pursuits. Itis not applicable to coal-water slurries, sludges, or pulverizedproducts under 0.5-mm-diameter sieve size. It is applicable tocoals of all ranks within the recognized limitations imposed byoxidation and de

4、composition characteristics of lower rankcoals. Because of its empirical nature, strict adherence to basicprinciples and permissive procedures are required for validresults (see Appendix X1). This complete standard is availableto producers, sellers, and consumers as a total moisture methodwhen other

5、 procedures or modifications are not mutuallyagreed on.1.2 Since coal can vary from extremely wet (water-saturated) to completely dry, special emphasis must be placedon the sampling, sample preparation, and the moisture deter-mination itself to ensure total reliability of measurement.Therefore, this

6、 standard entails collection of the gross sample,sample preparation, and the method of determination.1.3 While it is recognized that such a standard may beunwieldy for routine usage in commercial operations, it canprovide a common base for agreement in cases of dispute orarbitration. The complete st

7、andard is referred to as the refereemethod. Embodied in the standard is the commercial methodstarting with the crushed and divided sample when the grosssample is not too wet to crush and divide. See Test MethodsD2961 and D3173 for other moisture methods.1.4 The values stated in either SI units or in

8、ch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 This standard does not purpor

9、t to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D121

10、Terminology of Coal and CokeD388 Classification of Coals by RankD2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalD2961 Test Method for Single-Stage Total Moisture Lessthan 15 % in Coal Reduced to 2.36-mm (No. 8 Sieve)TopsizeD3173 Test

11、 Method for Moisture in the Analysis Sample ofCoal and CokeD5865 Test Method for Gross Calorific Value of Coal andCokeD7430 Practice for Mechanical Sampling of Coal3. Terminology3.1 DefinitionsFor additional definitions of terms used inthis test method, refer to Terminology D121.3.2 Definitions of T

12、erms Specific to This Standard:3.2.1 air dryinga process of partial drying of a coalsample to bring it to near equilibrium with the atmosphere inthe room in which further reduction/division of the sample is totake place.3.2.2 air-dry lossthe loss in weight, expressed as apercent, resulting from each

13、 air-drying operation.3.2.3 easily oxidized coalslow-rank coals such as subbi-tuminous or lignitic coals.3.2.4 equilibriumcondition reached in air drying when thechange in weight of the sample, under conditions of ambienttemperature and humidity, is no more than 0.1 % h or0.05 % 12 h.1This test meth

14、od is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.21 on Methods ofAnalysis.Current edition approved Feb. 1, 2017. Published February 2017. Originallyapproved in 1974. Last previous edition approved in 2015 as D3302/D3302M15.DOI: 1

15、0.1520/D3302_D3302M-17.2For 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 Summary page onthe ASTM website.Copyright ASTM International, 100 Barr

16、 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 Recomme

17、ndations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.2.5 residual moisturethat moisture remaining in thesample after air drying.3.2.6 total moisturesee Terminology D121.4. Summary of Test Method (See Fig. 1)4.1 This test method is based on the loss in weight

18、 of a coalsample in an air atmosphere under rigidly controlled conditionsof temperature, time, and airflow.4.2 Alternative Methods:4.2.1 Referee Method, which may be used in cases ofdispute or arbitration. The gross moisture sample is air dried toequilibrate it with the atmosphere at each stage of d

19、ivision andreduction. No air drying is necessary if the sample is already atequilibrium with the atmosphere as indicated by stable weight.4.2.2 Commercial Method, which may be used in routinecommercial practice or when the concerned parties agree uponFIG. 1 Total Moisture Determination on Gross Samp

20、le, Special Moisture Subsample, or on Crushed and Divided SampleD3302/D3302M 172this method. The crushed and divided moisture sample is airdried to equilibrate it with the atmosphere in which furtherdivision and reduction are to occur.4.2.3 Residual moisture determination is made in a heatedforced-a

21、ir circulation oven under rigidly defined conditions.4.3 Total moisture is calculated from loss (or gains) in airdrying and the residual moisture.5. Significance and Use5.1 The collection and treatment of the sample as specifiedfor the referee method is intended for the express purpose ofdetermining

22、 the total moisture in coal. The standard is avail-able to producers, sellers, and consumers as a method ofdetermination when other techniques or modifications are notmutually agreed upon.5.2 The commercial method, which determines total mois-ture content of the crushed and divided sample, is design

23、ated asthe method for total moisture for routine commercial practice.6. Apparatus6.1 Drying FloorA smooth clean floor area in a room freeof contamination by dust or other material and that permits aircirculation without excessive heat or air currents. Conditionsfor an air-drying floor should approac

24、h those established foroven drying as much as possible.6.2 Air-Drying OvenA device for passing slightly heatedair over the sample. The oven should be capable of maintaininga temperature of 10 to 15C (18 to 27F above ambienttemperature with a maximum oven temperature of 40C104F unless ambient tempera

25、ture is above 40C 104F, inwhich case ambient temperature shall be used. In the case ofeasily oxidized coals, the temperature should not be more than10C 18F above ambient temperature. Air changes shall beat the rate of one to four per minute. A typical oven is shownin Fig. 2.6.3 Drying Pans:6.3.1 Pan

26、s for Gross Sample, noncorroding, weight-stableat temperature used, of sufficient size so that the sample can bespread to a depth of not more than twice the diameter of thelargest particles if larger than 13 mm 0.5 in. or not more than25-mm 1.0-in. depth for smaller coal, with pan sides about 50to 7

27、5 mm 2 to 3 in. high.6.3.2 Pans for Crushed and Divided Sample, noncorroding,weight-stable at temperature used, of sufficient size so that thesample can be spread to a depth of not more than 25 mm1.0 in. with sides not more than 38 mm 1.5 in. high.6.4 Scale (Gross Sample)a scale of at least 45-kg 10

28、0-lbs capacity and sensitive to 23 g 0.05 lbs in 45 kg 100 lbs.6.5 Balance (Crushed Sample), sensitive to 0.1 g with acapacity sufficient to weigh pan, sample, and container.6.6 Laboratory Sample Containersheavy vapor-impervious bags, properly sealed, or noncorroding cans such asthose with an airtig

29、ht, friction top or screw top sealed with arubber gasket and pressure-sensitive tape for use in storage andtransport of the laboratory sample. Glass containers, sealedwith rubber gaskets, can be used, but care must be taken toavoid breakage in transport.6.7 Drying Oven (for residual moisture on 250-

30、m (No. 60)sieve by 0 sample)This oven is described in Test MethodD3173 and can be of the form illustrated in Fig. 1 in TestMethod D3173.6.8 Analytical Balance, sensitive to 0.1 mg (for residualmoisture on 250-m (No. 60) by 0 sample).6.9 Capsules, with covers, described in Test Method D3173.7. Precau

31、tions7.1 In collecting, handling, reducing, and dividing anymoisture sample, all operations shall be done rapidly and in asfew operations as possible, since moisture loss depends onseveral factors other than total moisture content, such as timerequired for crushing, atmospheric temperature and humid

32、ity,and type of crushing equipment.7.2 While awaiting preparation, the uncrushed gross mois-ture sample shall be sealed in appropriate containers in orderthat it be protected from moisture change as a result ofFIG. 2 Air-Drying OvenD3302/D3302M 173exposure to ambient air, rain, snow, wind, and sun,

33、or contactwith absorbent materials.7.3 If the gross sample requires air drying, then the initialweight of the original gross moisture sample and containershall be recorded, and the moisture loss or gain of sample andcontainers shall be determined before the sample is reduced.7.4 Whenever a distinct

34、change of humidity occurs duringthe course of preparation of an air-dried sample, the subsampleshould be weighed and equilibrated with the new atmosphereand the weight loss or gain used in the calculation of totalmoisture content.7.5 Whenever subsamples are stored or transported andmoisture condense

35、s on the container, then the container andsubsample shall be weighed, equilibrated to the new atmo-sphere by air drying, and the weight loss or gain shall be usedin the calculation of total moisture content.7.6 Since most coals have a tendency to oxidize on exposureto air, the air-drying procedure s

36、hould not be prolonged pastthe time necessary to bring the sample to equilibrium with thetemperature and humidity of the air in the room in whichfurther reduction and division are to be made. Easily oxidizedcoals must not be air dried at a temperature exceeding 10Cabove ambient temperature. In no ca

37、se shall the air drying bedone at a temperature over 40C. Air drying of low-rank coalsshould not exceed 18 h because of oxidation. In the case oflignite, the goal of reaching equilibrium should be weighedagainst the possibility of oxidation.7.7 Protect crushed, divided, pulverized, or pulverizingsam

38、ples from atmospheric changes affecting surface moistureor otherwise affecting sample integrity.7.7.1 Procedures useful in maintaining uniform temperatureand humidity conditions and minimum airflow in moisturedetermination and sample preparation area include the follow-ing: (1) closed dust control s

39、ystem, recycling filtered air; (2)hood over dust-producing equipment to minimize airflowrequired to remove dust; and (3) pulling makeup air fromwithin the building to replace exhausted air or using temperedor conditioned makeup air.7.7.2 Avoid heatup of pulverizer by: (1) using pulverizerlarge enoug

40、h to process sample quickly and (2) allowing timefor pulverizer to come to room temperature before reuse.8. Sampling8.1 The principles, terms, organization, and collection as setforth in Practice D2234/D2234M and Practice D7430 shallapply to the collection of the total moisture sample. Particularatt

41、ention is directed to Section 8 of Practice D2234/D2234Mand Section 7 of Practice D7430. The increments as establishedin Table 2 of Practice D2234/D2234M or Table 1 of PracticeD7430 for mechanically cleaned coal are deemed adequate forgeneral purpose sampling for total moisture.8.2 Sampling of Coal

42、for Total Moisture Determinations:8.2.1 Types of Moisture SamplesMoisture determinationsas specified in the method to be used are to be made on thefollowing kinds of samples.8.2.1.1 Entire Gross SampleFor referee tests, air dry theentire gross sample and measure the weight loss from the entiregross

43、sample during this drying. This procedure can be carriedout on the entire gross sample as a single batch or on groups ofprimary increments or as separate operations on the individualprimary increments; obtain, by one of these means, the totalweight loss from the entire gross sample. After this air d

44、rying,the sample can be crushed or divided, or both, as required bythe referee test for moisture.8.2.1.2 Special Moisture SubsampleFor moisture testing,a special subsample can be taken from a gross sample beforeany operations of air drying or crushing. Take this subsamplefrom the gross sample in acc

45、ordance with the requirements of8.2 of Practice D2234/D2234M or 8.2 of Practice D7430.8.2.1.3 Other Subsamples for Moisture TestingFor mois-ture testing, a subsample can be used that is collected after theinitial crushing and dividing of a gross sample. The proceduresfor the crushing and dividing, a

46、nd for this subsequent subsam-pling for moisture, are given in Practice D2013.8.2.2 Special PrecautionsCollect samples and subsamplesfor moisture in such a manner that there is no unmeasured lossof moisture of significant amount. Make adequate weighingsbefore and after drying or other operations to

47、measure allsignificant weight losses.8.2.3 Weight of IncrementsThe minimum weight of eachincrement must be that which is sufficient as to be free of bias.This depends on the top size of the coal in the stream beingsampled, the dimensions of the collection device, and otherfactors of the withdrawal o

48、f the increment. Since much of themoisture tends to be distributed uniformly across the surface,moisture bias is present when the size consist of the sample isnot the same as the size consist of the lot sampled. In addition,when there is no knowledge of the sampling characteristics formoisture, each

49、 increment shall not weigh less than the values inTable 2 of Practice D2234/D2234M or Table 1 of PracticeD7430.8.2.4 Number of IncrementsThe number of incrementsrequired for a given degree of precision depends on the weightof the increments, the distribution of the moisture, and the totalamount of moisture. The distribution of moisture, however, isnot easily evaluated independent of total moisture;consequently, the combined effects can be measured by deter-mining the sampling characteristics for moisture.8.2.4.1 Moisture Samp

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1