1、BRITISH STANDARD BS 3142-2: 1990 Specification for Manufactured solid smokeless fuels for household use Part 2: Cokes for domestic openable and closed appliances and open fires with fan-assisted primary air UDC 662.749:662.741:683.943:006.3/.8BS3142-2:1990 This British Standard, having been prepared
2、 under the directionof the Solid Mineral Fuels Standards Policy Committee, was published underthe authority of the Board ofBSI and comes into effect on 31July 1990 BSI 09-1999 First published September 1965 Second edition July 1990 The following BSI references relate to the work on this standard: Co
3、mmittee reference SFC/6 Draftfor comment 89/50134 DC ISBN 0 580 18321 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Solid Mineral Fuels Standards Policy Committee (SFC/-) to Technical Committee SFC/6, upon which the following bodies
4、were represented: Association of County Councils Association of Metropolitan Authorities British Coal Corporation Chamber of Coal Traders Coke Oven Managers Association Consumer Policy Committee of BSI Independent Coke Producers Association Institute of Trading Standards Administration Low Temperatu
5、re Coal Distillers Association of Great Britain Ltd. Solid Smokeless Fuels Federation Amendments issued since publication Amd. No. Date CommentsBS3142-2:1990 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Sampling and preparation of samples 1 3 Size 1 4
6、 Total moisture 1 5 Combustion test 1 6 Quality control 1 Appendix A Sampling procedure 3 Appendix B Preparation of samples for testing 4 Appendix C Determination of undersize and oversize 4 Appendix D Determination of total moisture 4 Appendix E Combustion test 5 Appendix F Quality control 7 Append
7、ix G Calibration of the thermostat 8 Figure 1 Test setting for boiler performance tests 11 Figure 2 QW/JS thermostat 12 Figure 3 Fittings for water temperature measurement 13 Figure 4 Ignition burner for simulated town or coke oven gas (1st family gas) 14 Figure 5 Ignition burner for natural gas (2n
8、d family gas) 15 Figure 6 Thermostat calibration curves 16 Figure 7 Modified valve plate mounting 16 Table 1 Alternative methods of assessing results 10 Publications referred to Inside back coverBS3142-2:1990 ii BSI 09-1999 Foreword This Part of BS 3142 has been prepared under the direction of the S
9、olid Mineral Fuels Standards Policy Committee and replaces BS 3142-2:1965 which is withdrawn. This edition introduces technical changes to bring the standard up to date but it does not reflect a full review of the standard, which will be undertaken is due course. The principle changes from the previ
10、ous edition are as follows: a) the standard is extended to cover openable appliances and open fires operating with fan-assisted primary air; b) the larger size of coke is designated in line with current practice; c) the values and units of parameters have been metricated; d) reference to gas coke wo
11、rks has been deleted; e) the testing and requirement for shale have been deleted. The specification provides for two size ranges of domestic coke, made by the high temperature carbonization of coal. It is not applicable to fuels produced by other processes. Appliances for which these cokes are used
12、include small domestic hot water supply and central heating boilers, solid fuel cookers, open and closed roomheaters and open fires with fan-assisted primary air requiring these size ranges. In all cases it is essential to employ the size of coke appropriate to the appliance in use. To ensure optimu
13、m performance in domestic use these cokes should be used in appliances included in the list of “Approved Domestic Solid Fuel Appliances” 1) , many of which comply with current British Standards. Because the specification covers cokes which may have different densities and other characteristics, the
14、behaviour in use of all cokes complying with it is not the same. For this reason it may be necessary with certain domestic appliances to adjust the controls to new settings to obtain optimum performance if the source of supply of coke is changed. This specification does no more than provide for the
15、quality of cokes at the time that they are dispatched by the producer. It is recognized that quality control cannot be absolute with a product manufactured in quantities of thousands of tonnes a day. The control procedures adopted are designed to ensure that the coke is on average of the specified q
16、uality and to limit the frequency with which the coke in any one bag or other small consignment may be found to be of a quality outside the limiting values. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their
17、 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, pages i and ii, pages1 to 16, an inside back cover and a back cover This standard has been updated (see c
18、opyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Published by the Solid Fuel Advisory Service and the Solid Smokeless Fuels Federation.BS3142-2:1990 BSI 09-1999 1 1 Scope This Part of BS 3142 specifies the sampling p
19、rocedure, requirements and test methods for cokes at producers works, intended for use in coke-burning openable and closed domestic appliances and open fires operating with fan-assisted primary air. These cokes have an overall nominal aperture size range of 10.0 mm to45.0 mm in accordance with the s
20、quare aperture plate in Table 3 of BS 410:1986 and are classified as follows: S (singles): nominal size range 10.0 mm to25.0mm square hole D (doubles): nominal size range 16.0 mm to45.0mm square hole The specification applies to cokes produced under the following manufacturing arrangements: a) S onl
21、y; b) S and D simultaneously from the same coals. NOTE 1When a plant is producing S and D coke simultaneously the reactivities of these cokes will be similar. For this reason a combustion test on the S coke is regarded as providing adequate control of the quality of the D coke and no separate combus
22、tion test of the D coke is required by this Part ofBS 3142. NOTE 2The cokes may be dispatched in weighed bags and/or in bulk. NOTE 3The titles of the publications referred to in this Part of BS 3142 are listed on the inside back cover. 2 Sampling and preparation of samples Regular sampling of cokes
23、that are intended to comply with this Part of BS 3142 shall be carried out at producers works. The samples shall be collected in the manner described in Appendix A and shall be prepared for testing in accordance with Appendix B. 3 Size When tested in accordance with Appendix C, cokes shall comply wi
24、th one of the following sets of requirements: a) S coke 1) Undersize. The mean proportion of coke passing a 10.0 mm square-aperture test sieve complying with BS 410 shall be not greater than5 % (but see clause 6). 2) Oversize. The mean proportion of coke retained on a 25.0 mm square-aperture test si
25、eve complying with BS 410 shall be not greater than 5 % (but see clause 6). b) D coke 1) Undersize. The mean proportion of coke passing a 16.0 mm square-aperture test sieve complying with BS 410 shall be not greater than5 % (but see clause 6). 2) Oversize. The mean proportion of coke retained on a 4
26、5.0 mm square-aperture test sieve complying with BS 410 shall be not greater than5 % (but see clause 6). NOTEThe purchase contract for the coke may indicate a narrower range of sieve sizes if specified by the supplier. 4 Total moisture When tested in accordance with Appendix D, the mean total moistu
27、re content of S or D cokes as dispatched from producers works shall be not greater than 12 % (but see clause 6). 5 Combustion test When tested in accordance with Appendix E, cokes shall comply with the following requirements (butsee clause 6). Not more than one failure to meet the requirements of a)
28、 or b) in this clause shall be permitted in any assessment period. If D coke is produced from plant which is at the same time producing S coke complying with the requirements of a) and b) as follows, provided that such D coke complies with the appropriate requirements of clauses 3, 4 and 6, it shall
29、 be deemed to comply with this Part of BS 3142 without being subjected to a combustion test. a) High output test. The mean water heating output during the 2 h high output test shall be not less than 4.4 kW. b) Banking test. The coke shall be capable of burning for a minimum period of 10 h with a mea
30、n water heating output not greater than1.4kW. 6 Quality control Representative samples shall be taken in accordance with Appendix A. Determinations of total moisture, undersize and oversize shall be carried out on samples taken each day that the coke is dispatched from the works. In order to control
31、 the consistency of quality of the coke the statistical treatment described in Appendix F shall be carried out on the test results for total moisture and size, obtained in accordance with Appendix C and Appendix D.BS3142-2:1990 2 BSI 09-1999 The results of these tests shall be assessed on running av
32、erages, corresponding with 40 consecutive results or an eight-week period, which are recalculated at approximately weekly intervals to ensure that the average values satisfy the specified mean values. As a further control of the consistency of the coke, limiting values are also specified beyond whic
33、h not more than two results in the assessment period shall fall. The limiting values for individual determinations (see Appendix F) shall be as follows: Combustion tests shall be carried out on every third sample of coke. The results shall be examined individually and not more than one result in the
34、 assessment period shall fall outside the specified high output or banking requirements. total moisture: 16 % maximum undersize: 8 % maximum oversize: 8 % maximum.BS3142-2:1990 BSI 09-1999 3 Appendix A Sampling procedure A.1 Introduction This appendix outlines the methods to be followed and the prec
35、autions to be observed in taking samples. It is important to ensure that the samples taken reflect the quality and consistency of all the coke dispatched. This requires special attention if the coke is dispatched in bags and/or bulk from more than one point. NOTEPoint of dispatch refers to the point
36、 in the works at which either bags are filled and loaded for dispatch or wagons are loaded with coke. A.2 Frequency of sampling Carry out sampling on every day that coke is dispatched from the producers works. Take samples at such times in the course of each week that the whole loading period is cov
37、ered. A.3 Methods of sampling Individual works differ in their procedures of coke handling. Some works dispatch coke in weighed bags, some in bulk and others by both methods. Two methods of sampling are specified, one for sampling where coke is filled into bags, the other for sampling the coke when
38、it is loaded in bulk. The two procedures are described in A.5 and A.6 respectively. If both the bag and the bulk loading points are fitted with similar debreezing or guard screens it is probable that the coke from each point will have the same size distribution. If this is found to be so by a series
39、 of tests, all samples shall be taken from the bag loading points by the method described in A.5, provided that all such points are covered in the sampling scheme. For plants where a difference is found between samples of the coke loaded from different dispatch points, all such points shall be inclu
40、ded in the sampling scheme, samples being taken from each by the methods described in A.5 and A.6, with a frequency in proportion to the quantity of coke loaded from that point. A.4 Stock and bought-in coke Any coke taken from stock, or bought-in from other works, which forms a part of the coke bagg
41、ed or loaded in bulk for subsequent dispatch, shall be taken into account in the scheme of sampling. NOTE 1If such coke is returned to the screening plant and mixed with current product for dispatch, no special arrangements are required. If coke is loaded direct from stock heaps, take an appropriate
42、 number of the samples from this coke. NOTE 2As a guide the frequency of sampling from stock heaps should depend on the proportions loaded from stock and loaded direct from current production. If there is a significant difference between the quality of the coke from stock and that of the coke from t
43、he current production, they shall be regarded as separate products for the purposes of sampling and testing. A.5 Bag sampling When sampling 50 kg bags of S coke take two bags together each day from those filled for dispatch. Use one of these bags as the sample for a total moisture determination and
44、the other for size analysis. If smaller bags are being filled, take sufficient bags to provide the two 50 kg samples. Use these samples as necessary for the combustion test as indicated in Appendix B. When sampling bags of D coke the same principles apply. In this instance take bags for size analysi
45、s each day the coke is dispatched and for a total moisture determination either each day or every third day that it is dispatched. NOTE 1The relaxation of sampling D coke every third day for total moisture is permitted only so long as the S coke complies with the total moisture requirements specifie
46、d in clause 4 and provided that both cokes are being dispatched without being mixed with coke taken from stock. After the samples have been taken ensure that the coke is removed from the bags otherwise changes may occur in size or total moisture content, or both. Unless the samples are to be prepare
47、d immediately for testing by the methods described in Appendix B, transfer the coke samples at once to closeable containers of metal or other rigid material and close the containers immediately. NOTE 2Sanitary dustbins with tight-fitting lids complying with BS 792 are suitable for this purpose. A.6
48、Sampling during bulk loading Take two samples of S coke each day that coke is dispatched, one for total moisture determination and the other for size analysis. The mass of each sample shall be approximately 50 kg and in no circumstances greater than 100 kg. These samples shall also be used as necess
49、ary for the combustion test as indicated in Appendix B. When sampling D coke the same principles shall apply. Take samples for size analysis each day the coke is dispatched and for a total moisture determination either each day or every third day that it is dispatched. Sample either at the loading point or at some position between the last screen (final debreezing screen if fitted) and the loading point. Take each sample as one increment with the loading boom or conveyor temporarily stopped, the whole cross section of the coke being sampled, or collect it at
