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1、INTERNATIONAL STANDARD ISO 23499 First edition 2008-06-01 Reference number ISO 23499:2008(E) ISO 2008 Coal Determination of bulk density Charbon Dtermination de la masse volumique en vrac Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing
2、Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 23499:2008(E) ii ISO 2008 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be prin
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5、 suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
6、 or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01
7、 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted with
8、out license from IHS -,-,- ISO 23499:2008(E) ISO 2008 All rights reserved iii Contents Page 1Scope 1 2Normative references 1 3Definitions 1 4Principle 1 5Samples and apparatus 1 6Sampling . 2 7Procedure . 2 8Expression of results 4 9Reporting of results . 5 10Precision . 5 11Test report 5 Bibliograp
9、hy . 6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 23499:2008(E) iv ISO 2008 All rights reserved Forewor
10、d 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 technical committees. Each member body interested in a subject for which a technica
11、l 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 with the International Electrotechnical Commission (IEC) on all matters of ele
12、ctrotechnical 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 International Standards adopted by the technical committees are circulated to th
13、e 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 may be the subject of patent rights. ISO shall not be held responsible for ide
14、ntifying 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, with permission of ASTM International, on ASTM D291, Standard Test Method for
15、Cubic Foot Weight of Crushed Bituminous Coal, copyright ASTM International. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license fro
16、m IHS -,-,- ISO 23499:2008(E) ISO 2008 All rights reserved 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 content as well as on the dimensions of the measuring co
17、ntainer. 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. The present method describes a procedure for determini
18、ng 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 designed to obtain a degree of compaction of coal comparab
19、le to the densities attained in industrial coke ovens. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- . vi Copy
20、right International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 23499:2008(E) ISO 2008 All rights reserved
21、 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 from flowi
22、ng 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 of bulk d
23、ensity 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 amendments) app
24、lies. 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 13909-4,
25、 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 known volum
26、e 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 density.
27、 37 mm Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 23499:2008(E) 2 ISO 2008 All rights reserved 5.2Appar
28、atus 5.2.1Measuring 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
29、 metal of sufficient 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
30、 . The most important 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 c
31、ircular opening of 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
32、be supported in a 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. 5.2.4Wei
33、ghing device, a weighing 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 i
34、n an airtight container 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 subdivi
35、ded, without crushing, 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 conta
36、iners and waterproof 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
37、 using a shovel or 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 pe
38、ripheral points. 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
39、 the edges. Loosen 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 Copyrig
40、ht International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 23499:2008(E) ISO 2008 All rights reserved 3 Dimensions in millimet
41、res a)Complete apparatus Figure 1 Apparatus for cone procedure Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- I
42、SO 23499:2008(E) 4 ISO 2008 All rights reserved 7.3After filling the 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
43、levelled off. Place the measuring box on the platform scale and weigh 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
44、 are the two main factors that affect its bulk density. The result of 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
45、 of the moisture determination and ISO 1953 for details of the size analysis 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 kilog
46、rams; is the mass of the filled measuring box, expressed in kilograms; 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)
47、Detail of adjustable hopper leg Key 1cone height 2height from iron shutter 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 Copyright Inte
48、rnational Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:16:58 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 23499:2008(E) ISO 2008 All rights reserved 5 The bulk density, , of the coal, expressed in kilograms per cubic metre, on an “as received” b