《ISO-12141-2002.pdf》由会员分享，可在线阅读，更多相关《ISO-12141-2002.pdf（48页珍藏版）》请在三一文库上搜索。
1、INTERNATIONAL STANDARD ISO 12141 First edition 2002-11-01 Reference number ISO 12141:2002(E) ISO 2002 Stationary source emissions Determination of mass concentration of particulate matter (dust) at low concentrations Manual gravimetric method missions de sources fixes Dtermination dune faible concen
2、tration en masse de matires particulaires (poussires) Mthode gravimtrique manuelle Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permi
3、tted without license from IHS -,-,- ISO 12141:2002(E) ii ISO 2002 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licens
4、ed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the
5、 software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to
6、 it is found, please inform the Central Secretariat at the address given below. ISO 2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per
7、mission 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 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland Copyright International Organi
8、zation for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 12141:2002(E) ISO 2002 All rights reserved iii Contents Page 1Scope . 1 2
9、Normative references . 1 3Terms and definitions 1 4Principle 4 5Sampling plane and sampling points 5 6Apparatus and materials (see summary annex E) . 7 7Calculation of nozzle diameter to obtain weighable quantities of dust . 13 8Weighing procedure . 14 9Sampling procedure . 16 10Thermal behaviour of
10、 dusts 18 11Validation of results 20 12Calculations 21 13Performance characteristics of the method 22 14Test report 23 Annexes ARequirements related to the working platform 25 BDetermination of flow direction with Pitot tubes 26 CDetermination of positions of sampling points in circular and retangul
11、ar ducts 27 DExamples of suitable access ports for sampling equipment . 31 EProven entry nozzle designs. 33 FSummary of apparatus requirements 35 GSampling volume, flowrate and duration. 36 HExamples of weighing bias . 37 IPrecision data. 39 Bibliography. 40 Copyright International Organization for
12、Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 12141:2002(E) iv ISO 2002 All rights reserved Foreword ISO (the International Organi
13、zation 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 technical committee has been establishe
14、d 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 electrotechnical standardization.
15、International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International 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 t
16、he member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 12141 was prepared by Techn
17、ical Committee ISO/TC 146, Air quality, Subcommittee SC 1, Stationary source emissions. Annexes A, C, E and F form a normative part of this International Standard. Annexes B, D, G, H and I of this International Standard are for information only. Copyright International Organization for Standardizati
18、on Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 12141:2002(E) ISO 2002 All rights reserved v Introduction This method was developed from close li
19、aison and cooperation between ISO/TC 146/SC 1/WG 11 and CEN/TC 264/WG 5, resulting in the preparation of this International Standard and the European Standard EN 13284-1. This International Standard is similar to EN 13284-1 with additional emphasis given on the use of high- volume sampling technique
20、s for the measurement of dust at low concentrations. It also gives procedures for extending the range of measurement of ISO 9096:1992 to lower concentrations. As in ISO 9096:1992, a representative, integrated sample is extracted from the flue gas and particulate matter entrained in the gas sample is
21、 separated by a filter. The pre-weighed filter is subsequently dried and weighed. Any increase in the mass is attributed to the collection of particulate matter on the filter. To meet the specifications of this International Standard, the particulate sample must be weighed to a specified level of ac
22、curacy. At low dust concentrations, this level of accuracy may be achieved by: a)exercising extreme care in weighing, as per procedures of this standard, b)extending the sampling time at conventional sampling rates, or c)sampling at higher rates for conventional sampling times (high-volume sampling)
23、. This International Standard in addition differs from ISO 9096:1992 by requiring the measurement of the mass of filter blanks, specifying weighing procedures. This method may be used for calibration of automated monitoring systems (AMSs) (see ISO 10155). If the waste gas contains unstable, reactive
24、 or semivolatile substances, the measurement will depend on the filtration temperature, and in-stack methods may be more applicable than out-stack methods for the calibration of automated monitoring systems. Copyright International Organization for Standardization Provided by IHS under license with
25、ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545
26、001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 12141:2002(E) ISO 2002 All rights reserved 1 Stationary source emissions Determination of mass concentration of particulate matter (dust) at low concentrations
27、Manual gravimetric method 1Scope This International Standard describes a reference method for the measurement of low dust content in ducted gaseous streams at concentrations below under standard conditions. This method has been validated with special emphasis on the region around . This Internationa
28、l Standard has been developed and validated for gaseous streams emitted by waste incinerators. More generally, it may be applied to emissions from other stationary sources, and to higher concentrations. If the gases contain unstable, reactive or semi-volatile substances, the measurement will depend
29、on the sampling and filter treatment conditions. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publi
30、cations do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to ap
31、plies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 3966:1977, Measurement of fluid flow in closed conduits Velocity area method using Pitot static tubes ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results ISO 9096:1
32、992, Stationary source emissions Determination of concentration and mass flow rate of particulate material in gas-carrying ducts Manual gravimetric method ISO 10780:1994, Stationary source emissions Measurement of velocity and volume flowrate of gas streams in ducts 3Terms and definitions For the pu
33、rposes of this International Standard, the following terms and definitions apply. 3.1 particulate matter dust particles, of any shape, structure or density, dispersed in the gas phase under the sampling conditions NOTEIn the method described, all the compounds that may be collected by filtration und
34、er specified conditions after sampling of the gas to be analysed, and which remain upstream of the filter and on the filter after drying under specified conditions, are considered to be dust (or particulate matter). However, for the purposes of some national standards, the definition of particulate
35、matter may extend to condensibles or reaction products collected under specified conditions (e.g. temperatures lower than the flue gas temperature). 50 mg/m3 5 mg/m3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/99
36、72545001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 12141:2002(E) 2 ISO 2002 All rights reserved 3.2 filtration temperature temperature of the sampled gas immediately downstream of the filter 3.3 in-stack filtration filtration in
37、 the duct with the filter in its filter holder placed immediately downstream of the sampling nozzle 3.4 out-stack filtration filtration outside the duct with the filter in its heated filter holder placed downstream of the sampling nozzle and the suction tube (sampling probe) 3.5 isokinetic sampling
38、sampling at a flowrate such that the velocity and direction of the gas entering the sampling nozzle () are the same as that of the gas in the duct at the sampling points, See Figure 1. NOTEThe velocity ratio expressed as a percentage characterizes the deviation from isokinetic sampling. Figure 1 Iso
39、kinetic sampling in duct vn vs vn/vs Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 12141:
40、2002(E) ISO 2002 All rights reserved 3 3.6 hydraulic diameter characteristic dimension of a duct cross-section (1) 3.7 sampling plane plane normal to the centreline of the duct at the sampling position See Figure 2. 3.8 sampling line line in the sampling plane along which sampling points are located
41、, bounded by the inner duct wall See Figure 2. Key 1Sampling lines 2Sampling plane 3Access port 4Flow 5Top of duct Figure 2 Illustration of definitions in relation to a circular duct dh dh= 4area of sampling plane length of perimeter of sampling plane Copyright International Organization for Standar
42、dization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/07/2007 22:38:28 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 12141:2002(E) 4 ISO 2002 All rights reserved 3.9 sampling point the specific position on a
43、sampling line at which a sample is extracted 3.10 standard conditions gas pressure and temperature constants and conditions to which volumetric calculations are referred NOTEFor the purposes of this International Standard, standard conditions are rounded to ; rounded to ; dry gas. 3.11 overall blank
44、 test sample taken at the plant site in an identical manner to the normal samples in the series, except that no gas is sampled during the test duration NOTEThe measured mass variation provides an estimation of the uncertainties. The overall blank value, divided by the average sampling volume of the
45、measurement series, provides an estimation of the detection limit (milligrams per cubic metre) of the whole measurement process, as carried out by the operator. The overall blank includes possible deposits on the filter and on all parts upstream. 3.12 weighing control procedure for the detection/cor
46、rection of apparent variations in mass due to possible changes between pre- and post-sampling weighing conditions, by using parts, identical to those to be weighed for dust measurements, pretreated and weighed under the same conditions of temperature and humidity (e.g. desiccator) as pre- and post-
47、sampling NOTEThe control parts are kept free from contamination. 3.13 measurement series successive measurements carried out in the same sampling plane, and under the same process conditions 3.14 limit value average limit value dust concentration that is permitted by authorities for the plant proces
48、s NOTEFor purposes other than regulatory uses, the measurement value is compared to a stated reference value. 3.15 high-volume sampling sampling at rates higher than typical in ISO 9096 by using larger-diameter nozzles and higher flowrates to maintain isokinetic sampling conditions NOTENozzle diameters are typically to , with corresponding flowrates of to . 4Principle A sample stream of the gas is extracted from the main g