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1、BRITISH STANDARD BS ISO 23499:2008 Coal Determination of bulk density ICS 73.040 ? Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without l
2、icense from IHS -,-,- BS ISO 23499:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2008 BSI 2008 ISBN 978 0 580 56506 9 National foreword This British Standard is the UK implementation of ISO 23499:2008. The UK participation in i
3、ts preparation was entrusted to Technical Committee PTI/16, Solid mineral fuels. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its c
4、orrect application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for R
5、esale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 23499 First edition 2008-06-01 Reference number ISO 23499:2008(E) Coal Determination of bulk density Charbon Dtermination de la masse volumique en vrac BS ISO 23499:2008 Co
6、pyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Copyright British Standards Institution Provided by IHS unde
7、r license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Contents Page 1Scope 1 2Normative references 1 3Definitions 1 4Principle 1 5Samples and apparatus 1 6Sampling . 2 7Pr
8、ocedure . 2 8Expression of results 4 9Reporting of results . 5 10Precision . 5 11Test report 5 Bibliography . 6 BS ISO 23499:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo
9、 reproduction or networking permitted without license from IHS -,-,- iv Foreword ISO (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 ISO tech
10、nical 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 closely
11、 with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft I
12、nternational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document
13、 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 23499 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 1, Coal preparation: Terminology and performance. This International Standard is based,
14、 with permission of ASTM International, on ASTM D291, Standard Test Method for Cubic Foot Weight of Crushed Bituminous Coal, copyright ASTM International. BS ISO 23499:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/591077000
15、1 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from IHS -,-,- v Introduction The bulk density of coal is influenced by its physical characteristics, such as relative density, shape and size distribution of the coal particles, on the coal moisture con
16、tent as well as on the dimensions of the measuring container. Since the results for coal bulk density change according to variations in the above factors, it is recommended that a separate size analysis and total moisture determination be made in accordance with ISO 1953 and ISO 589, respectively. T
17、he present method describes a procedure for determining a reference bulk density for crushed coal such as that charged into coke ovens. When charging a coke oven, a knowledge of the mass of coal placed in the oven for maintaining a relatively constant oven charge is a requirement. This test is desig
18、ned to obtain a degree of compaction of coal comparable to the densities attained in industrial coke ovens. BS ISO 23499:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo rep
19、roduction or networking permitted without license from IHS -,-,- blank Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from
20、IHS -,-,- 1 Coal Determination of bulk density 1Scope This International Standard provides description of a cone procedure for determining an uncompacted bulk density of crushed coal less than in size, such as is charged into coke ovens. It focuses on the uncompacted bulk density of coal resulting f
21、rom flowing the material into a measuring container (box) in the absence of compacting forces. This International Standard does not cover procedures for determining a compacted coal bulk density nor to the testing of fine or powdered coal (for boiler or utility application) nor to the determination
22、of bulk density of coal in storage piles. 2Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendm
23、ents) applies. ISO 589, Hard coal Determination of total moisture ISO 1213-1, Solid mineral fuels Vocabulary Part 1: Terms relating to coal preparation ISO 1213-2, Solid mineral fuels Vocabulary Part 2: Terms relating to sampling, testing and analysis ISO 1953, Hard coal Size analysis by sieving ISO
24、 13909-4, Hard coal and coke Mechanical sampling Part 4: Coal Preparation of test samples 3Definitions For the purposes of this document, the terms and definitions given in ISO 1213-1 and ISO 1213-2 apply. 4Principle The bulk density is determined by filling a weighed container (measuring box) of kn
25、own volume with coal and determining the increase in mass. 5Samples and apparatus 5.1General Samples containing fines can show significant variations in bulk density with variations in moisture. Care should be taken to ensure that moisture in the test sample is representative of the portion for bulk
26、 density. 37 mm BS ISO 23499:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 5.2Apparatus 5.2.1Measuri
27、ng box, a cubical container of () capacity and internal dimensions of (), with a smooth inner surface, rigidly constructed and fitted with handles. The exact volume of the box, in cubic metres, shall be determined using water of a known density. The container shall be constructed of metal of suffici
28、ent thickness to ensure the rigidity of the walls and the base of the container under the conditions of the test. (Minimum wall thickness of is recommended.) NOTEThe internal dimensions of the cubical container can be “rounded off” to with an acceptable tolerance, giving a volume of . The most impor
29、tant criterion is to know the exact volume of the measuring box since it is critical for calculating the coal bulk density. 5.2.2Cone, for filling the box, should conform to Figure 1. The dimensions of this cone shall be as follows: high with an inside diameter at the top of and a circular opening o
30、f in diameter at the bottom. A slide valve consisting of a slide-plate shutter and its supports shall be welded to the bottom of the cone in such a manner that the valve can be opened and closed with ease by removing or inserting the shutter in its supporting slides. The cone shall be supported in a
31、 tripod frame having a circular opening at the top of in diameter. This frame shall support the cone so that the top side of the shutter shall be from the inside bottom surface of the box (see Figure 1). 5.2.3Leveling bar, a steel strip approximately long by wide and thick. 5.2.4Weighing device, a w
32、eighing platform capable of weighing up to and sensitive to . 6Sampling 6.1Test portion for bulk density Crushed coal samples shall be collected in accordance with ISO 13909-4. During the collection of the test portion for bulk density, the increments of the sample shall be stored in an airtight con
33、tainer to prevent loss of moisture. The minimum mass of sample for bulk density shall be , which is sufficient for four replicate determinations and the subsequent determination of total moisture. 6.2Test sample The test portion for bulk density shall be thoroughly mixed and subdivided, without crus
34、hing, into four portions in accordance with ISO 13909-4. This operation shall be done as quickly as possible to avoid loss of moisture, and the bulk density shall be determined immediately. If the determination cannot be made immediately, the samples shall be kept in air-tight containers and waterpr
35、oof with minimum airspace and with tightly fitting covers until the time for making the determination. 7Procedure 7.1Before filling the cone hopper with coal, level its tripod on a metal plate or solid floor. Pour the prepared sample into a pile on the floor and carefully flatten it using a shovel o
36、r scoop to about in thickness. Avoid putting undue pressure on the coal with the back of the shovel or scoop. Take successive shovelfuls or scoopfuls from uniformly distributed points in the pile and allow them to slide gently from the shovel or scoop into the hopper at different peripheral points.
37、This prevents segregation and packing while the hopper is being filled. Place about of coal in the hopper. 7.2Centre the previously weighed measuring box under the valve of the cone. Then remove the valve shutter completely, allowing all of the coal to flow into the box and overflow the edges. Loose
38、n wet coal not flowing freely from the hopper by gently thrusting downward through the coal to the valve with the levelling bar. (0,028 40,000 082)m31 ft3 305 mm 1 ft 3 mm 300 mm 0,027 m3 610 mm510 mm115 mm 460 mm560 mm 760 mm40 mm5 mm 100 kg0,05 kg 150 kg 34 kg 100 mm 34 kg BS ISO 23499:2008 Copyri
39、ght British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 Dimensions in millimetres a)Complete apparatus Figure 1 Apparatus
40、 for cone procedure BS ISO 23499:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 7.3After filling the
41、box, carefully level off the excess coal above the box edge by means of the levelling bar, ensuring at the same time that all the corners of the box are filled. Avoid jarring or shifting the filled box until all the excess coal is levelled off. Place the measuring box on the platform scale and weigh
42、 it to the nearest . Record the difference in mass between the filled and the empty box to the nearest as the uncompacted mass of coal. Aside from the character of the coal itself, moisture content and size distribution of the coal are the two main factors that affect its bulk density. The result of
43、 the moisture determination shall be included in the test report. It is also necessary that a sieve analysis of the coal be reported along with the bulk density for proper interpretation of the bulk density. See ISO 589 for details of the moisture determination and ISO 1953 for details of the size a
44、nalysis by sieving. 8Expression of results The bulk density, , of the coal, expressed in kilograms per cubic metre, on a dry basis, is given by Equation (1): (1) where is the mass of the clean, dry measuring box, expressed in kilograms; is the mass of the filled measuring box, expressed in kilograms
45、; is the volume of the clean, dry measuring box, expressed in cubic metres; is the total moisture of the coal, expressed as a percentage by mass, determined in accordance with ISO 589. b)Iron shutter to fit the base of the hopperc)Detail of adjustable hopper leg Key 1cone height 2height from iron sh
46、utter to internal base of measuring box 3measuring box 4nut 5lock nut 6M16 bolt a steel. b DN18 pipe. Figure 1 Apparatus for cone procedure (continued) 1,6 mm 0,05 kg0,05 kg B,db B,db= (m1 m0) V (100 M) 100 m0 m1 V M BS ISO 23499:2008 Copyright British Standards Institution Provided by IHS under lic
47、ense with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 22:30:55 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 The bulk density, , of the coal, expressed in kilograms per cubic metre, on an “as received” basis, is given by Equation (2): (2) where the symbols are the same as for Equation (1). 9Reporting of results Each result shall be expressed in kilograms per cubic metre to one decimal place. The reported mean value shall be the mean of duplicate determinations, and shall
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