1、BRITISH STANDARD BS1016-108.2: 1992 Methods for Analysis and testing of coal and coke Part108: Tests special to coke Section108.2 Determination of Micum and Irsid indicesBS1016-108.2:1992 This British Standard, having been prepared under the directionof the Solid Mineral Fuels Standards Policy Commi
2、ttee, was published underthe authority of the Standards Board and comes into effect on 31January1992 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference SFC/3 Draft for comment90/56254DC ISBN 0 580 20176 7 Committees responsible for this British Standard
3、 The preparation of this British Standard was entrusted by the Solid Mineral Fuels Standards Policy Committee (SFC/-) to Technical Committee SFC/3, upon which the following bodies were represented: British Cement Association British Coal Corporation British Gas plc British Steel Industry Electricity
4、 Industry in United Kingdom GAMBICA (BEAMA Ltd.) Institute of British Foundrymen Institute of Petroleum Power Generation Contractors Association (BEAMA Ltd.) Amendments issued since publication Amd. No. Date CommentsBS1016-108.2:1992 BSI 08-1999 i Contents Page Committees responsible Inside front co
5、ver Foreword ii 1 Scope 1 2 Definitions 1 3 Principle 1 4 Apparatus 1 5 Sampling and size analysis 3 6 Preparation of test portion 3 7 Procedure 3 8 Expression of results 4 9 Precision 4 10 Test report 4 Figure 1 Cylindrical steel drum and tray 2 Table 1 Precision 4 Publication(s) referred to Inside
6、 back coverBS1016-108.2:1992 ii BSI 08-1999 Foreword This Section of BS1016 has been prepared under the direction of the Solid Mineral Fuels Standards Policy Committee. Part108 is a revision of the1980 edition of BS1016-13, which will be withdrawn when Sections108.5 and108.6 are published. This Sect
7、ion replaces4.3 of BS1016-13:1980, from which the principal changes are as follows. a) The test sample is now dried, if necessary, so that its moisture content is lower than5%(m/m). b) The sieving of the test portion after rotation in the drum is now carried out using only those test sieves correspo
8、nding to the indices to be determined. c) The Irsid test is now specified as a separate test involving500 continuous revolutions of the drum, instead of being an additional test involving a further400 revolutions after a Micum test(100 revolutions) has been completed. Part108 is a further Part numbe
9、red under a scheme for rationalizing and restructuring BS1016. The new series, when complete, will begin with Part100, which will include a general introduction. The earlier series of Parts is as follows, with the new Part numbers (which will be given to revisions when they are published) in parenth
10、eses. Part 1: Total moisture of coal (Part101); Part 2: Total moisture of coke (Part102); Part 5: Gross calorific value of coal and coke (Part105); Part 6: Ultimate analysis of coal (Part106); Part 7: Ultimate analysis of coke (Part106); Part 8: Chlorine in coal and coke (Part106); Part 9: Phosphoru
11、s in coal and coke (Part106); Part 10: Arsenic in coal and coke (Part106); Part 11: Forms of sulphur in coal (Part106); Part 14: Analysis of coal ash and coke ash (Part114); Part 15: Fusibility of coal ash and coke ash (Part113); Part 16: Methods for reporting results (Part100); Part 17: Size analys
12、is of coal (Part109); Part 18: Size analysis of coke (Part110); Part 20: Determination of Hardgrove grindability index of hard coal (Part112); Part 21: Determination of moisture-holding capacity of hard coal (Part103). The following Parts in the new series have been published or are in preparation.
13、Part 104: Proximate analysis; Part 107: Caking and swelling properties of coal; Part 108: Tests special to coke; Part 111: Determination of abrasion index of coal. Part108 is divided into six Sections as follows. Section 108.1: Determination of shatter indices; Section 108.2: Determination of Micum
14、and Irsid indices; Section 108.3: Determination of bulk density (small container); Section 108.4: Determination of bulk density (large container); Section 108.5: Determination of density and porosity 1) ; Section 108.6: Determination of critical air blast 1) . 1) In preparation.BS1016-108.2:1992 BSI
15、 08-1999 iii This Section is related to ISO556:1980, published by the International Organization for Standardization(ISO). The principal differences are as follows. 1) ISO556 also describes tests using a larger drum (the “full-Micum drum”). 2) ISO556 recommends the use of certain test sieves with ap
16、erture sizes which are different from those specified in this Section of BS1016. 3) ISO556 specifies a full size analysis of the test portion after rotation in the drum, instead of using only those test sieves corresponding to the indices to be determined. 4) ISO556 describes the Irsid test as an ad
17、ditional test involving a further400revolutions of the drum after a Micum test(100 revolutions) has been completed, instead of being a separate test involving500 continuous revolutions. WARNING NOTE. This British Standard does not necessarily detail all the precautions necessary to comply with the r
18、equirements of the Health and Safety at Work etc. Act1974 or the Control of Substances Hazardous to Health Regulations1988. Attention should be paid to any appropriate precautions and the method should be operated only by trained personnel. A British Standard does not purport to include all the nece
19、ssary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to
20、4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS1016-108.2:1992 BSI 08-1999 1 1 Scope This Section of BS1016 describes methods for
21、 determining the strength of coke by the Micum and Irsid tests. It is applicable to coke having a nominal top size greater than20mm. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Section of BS1016 the follo
22、wing definitions apply. 2.1 micum indices the percentages of a specially prepared sample of coke remaining on a test sieve of40mm nominal size of openings (nominal aperture size) (round hole) and passing a test sieve of10mm nominal size of openings (round hole), denoted by M 40and M 10respectively,
23、after the sample has been subjected to100 revolutions by a specified procedure in a rotating drum NOTEOther indices, e.g.M 60 , M 20 , may be reported if required. 2.2 irsid indices the percentages of a specially prepared sample of coke remaining on a test sieve of40mm nominal size of openings (nomi
24、nal aperture size) (round hole) and passing a test sieve of10mm nominal size of openings (round hole), denoted by I 40and I 10respectively, after the sample has been subjected to500 revolutions by a specified procedure in a rotating drum NOTEOther indices, e.g.I 20 , may be reported in addition to,
25、or in place of, I 40if required. 3 Principle A test portion taken from the coke above20mm particle size and of known size distribution is subjected to mechanical stresses in a rotating drum for100revolutions (Micum test) or500 revolutions (Irsid test). The mass of coke which is then retained on each
26、 of two or more test sieves of different aperture sizes is determined. 4 Apparatus 4.1 Cylindrical steel drum, having the following dimensions (see Figure 1). Internal length:500 2mm Internal diameter:1000 5mm The drum shall be made of10mm steel plate. Except for the lifting flights, the internal cu
27、rved surface of the drum shall be smooth and uninterrupted. NOTE 1The drum should preferably be of welded construction and should be replaced if the wall thickness is reduced to less than5mm due to wear. Four lifting flights, each500mm long, made of100mm by50mm by10mm thick steel angle, shall be wel
28、ded or bolted to the full length of the internal curved surface of the drum, parallel to the axis of the drum and spaced at90intervals so as to divide the periphery into four equal arcs. The narrower flange of each lifting flight shall be in contact with the curved surface and shall point in the dir
29、ection opposite to that of the driven rotation of the drum. NOTE 2The lifting flights should be replaced when the wider flanges have worn down to95mm. The drum shall have an opening, not less than500mm wide, in the curved surface along its full length. This opening shall be fitted with a cover, the
30、inner portion of which shall be made of10mm steel plate, of the same curvature as the drum and of the same size as the opening, so that when the cover is in position the inside face shall be approximately flush with the internal surface of the drum. The cover shall have an outer framework of50mm by1
31、0mm steel strip, overlapping the inner portion by25mm all round. It shall be possible to fasten the cover securely by four bolts through holes at the corners of the outer framework. Housing for the bolts shall be provided by a strip of steel,28mm by16mm, welded to each end plate of the drum. The out
32、er framework of the cover shall be fitted with two handles and also with a sponge rubber gasket, to form a dustproof seal when the cover is in position. The additional mass due to the framework, handles etc. shall be balanced by a plate welded on the outside of the opposite arc of the drum. The drum
33、 shall be fitted with two stub axles which shall be not less than50mm in diameter and not less than250mm in length, mounted on bearings to give a clearance of230mm to300mm below the drum to allow the removal of the coke from the drum. To facilitate emptying, it shall be possible to rotate the drum i
34、n either direction by hand. The drum shall be capable of being driven at25 1r/min(a rotational frequency of0.417 0.017Hz) by suitable pulleys or gearing. A revolution counter shall be connected to the drum. NOTE 3The revolution counter may also be connected to the motor so that the latter is automat
35、ically switched off after100 or500 revolutions. 4.2 Tray, approximately1500mm by600mm by150mm deep, made of a suitable abrasion- and wear-resistant material, for receiving the coke on discharge. The wall at one end shall be inclined at45to facilitate emptying. NOTEGalvanized sheet,1.22mm thick, is a
36、 suitable material for the tray.BS 1016-108.2:1992 2 BSI 08-1999 Figure 1 Cylindrical steel drum and trayBS1016-108.2:1992 BSI 08-1999 3 4.3 Test sieves, of perforated plate, round hole, complying with BS410 and of nominal aperture sizes200,180,160,140,120,100,80,60,50,40, 30,20 and10mm. The sieve p
37、lates shall be600mm square and shall be mounted in hardwood frames armoured with angle plates to reduce wear. When the wear on any aperture exceeds2%of its nominal size, the aperture shall be blanked off or the test sieve changed. NOTEFor the larger sizes of foundry coke, ring gauges may be used ins
38、tead of test sieves. 4.4 Weighing machine, with a capacity of not less than25kg, capable of weighing to the nearest10g. 5 Sampling and size analysis Take two gross samples for physical testing in accordance with BS1017-2. Prepare one of these samples for the determination of moisture content in acco
39、rdance with BS1017-2 and carry out the determination in accordance with BS1016-2. If the moisture content is higher than5%(m/m), dry the other sample sufficiently to reduce the moisture content to lower than5%(m/m). Use this second sample for the remainder of the test. Carry out a size analysis on t
40、he sample using a set of test sieves(4.3) of successive aperture size, the largest aperture size being that on which not more than5%(m/m) of the sample remains. Hand-place the coke on the sieves of aperture size down to and including40mm. For the smaller aperture sizes, carry out sieving by hand-sha
41、king. If the quantity of coke remaining on a sieve after100movements is such that it would cover more than75% of the sieve area, divide it into two or more portions and hand-shake each portion separately. Weigh each size fraction, to the nearest10g, using the weighing machine(4.4) and place each fra
42、ction in a separate pile or container. Record the masses retained on the individual sieves as cumulative percentages. 6 Preparation of test portion Constitute a25.0 0.1kg test portion containing all fractions of coke greater than20mm in size in approximately the same proportions as they are present
43、in the gross sample. Prepare the test portion by taking at random from each of the separate size fractions of coke (see clause5), down to and including the20mm to30mm fraction, an appropriate mass, weighed to the nearest10g using the weighing machine(4.4). NOTE 1The simplest way of achieving this is
44、 to calculate the cumulative mass of coke required in each of these size fractions in the test portion, so as to correspond to the proportions in the gross sample. Then, starting with the fraction with the largest particle size, select pieces of coke and place them in a weighed container until the r
45、equired cumulative mass for each size fraction has been obtained. NOTE 2When testing larger sizes of coke it is recommended that the test portion be constituted from all size fractions of coke greater than60mm in size. 7 Procedure 7.1 Micum test(100 revolutions) 7.1.1 Determination Transfer the test
46、 portion (see clause6) into the clean and empty drum(4.1), taking care to minimize breakage of the coke. Secure the cover on the drum. Rotate the drum at a constant251r/min (a rotational frequency of0.417 0.017Hz) for100 revolutions. Allow the dust to settle for1min, remove the cover and empty the c
47、ontents of the drum into the tray(4.2). Using the test sieves(4.3) corresponding to the indices to be determined, sieve all the contents of the tray by hand-placing the coke on the sieves of aperture size down to and including40mm and by hand-shaking for the smaller aperture sizes. NOTEMechanical si
48、eving may be used for size fractions with a maximum particle size of less than40mm if it can be demonstrated that the result of the sieving will be the same as that achieved by hand sieving. Cumulatively weigh the size fractions, to the, nearest10g, using the weighing machine(4.4), noting the mass c
49、orresponding to each size. 7.1.2 Validity of determination For the determination to be valid, the total mass of the size fractions (see7.1.1) shall not differ from the original mass of the test portion by more than150g. If the difference exceeds this limit, repeat the determination. 7.2 Irsid test (500 revolutions) 7.2.1 Determination Carry out the test as described in7.1.1 but rotate the drum at a constant251r/min for500 revolutions (instead of100 revolutions). 7.2.2 Validity of determination For the determ
