1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 11057:2011Air quality Test method forfiltration characterization ofcleanable filter mediaBS ISO 11057:2011 BRITISH STANDARDNational forewordThis British Standard is the UK
2、 implementation of ISO 11057:2011.The UK participation in its preparation was entrusted to TechnicalCommittee EH/2/1, Stationary source emission.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the neces
3、saryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 66021 4ICS 13.040.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Commi
4、ttee on 31 May 2011.Amendments issued since publicationDate Text affectedBS ISO 11057:2011Reference numberISO 11057:2011(E)ISO 2011INTERNATIONAL STANDARD ISO11057First edition2011-05-15Air quality Test method for filtration characterization of cleanable filter media Qualit de lair Mthode dessai pour
5、 la caractrisation de la filtration des filtres lavables BS ISO 11057:2011ISO 11057:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 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, includin
6、g 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 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published
7、in Switzerland ii ISO 2011 All rights reservedBS ISO 11057:2011ISO 11057:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Terms and definitions .1 3 Gases and materials5 4 Principle .6 5 Standard reference apparatus and procedure .6 5.1 General .6 5.2 Compo
8、nents of the standard reference apparatus9 5.3 Operating parameters for the test .11 5.4 Measured parameters .12 5.5 Test sequences12 5.6 Test preparations and environment 13 5.7 Step-by-step procedures of the standard test .17 6 Procedure and filter media for testing of equivalent apparatus and sel
9、ection of test houses 18 6.1 Procedure and filter media for testing of equivalent apparatus with the standard reference apparatus .18 6.2 Selection of test houses .18 7 Processing of data and presentation of results.19 7.1 Processing of data 19 7.2 Presentation of results19 Annex A (normative) Test
10、apparatus 24 Annex B (informative) Other information and considerations .28 Bibliography30 BS ISO 11057:2011ISO 11057:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). T
11、he 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 established has the right to be represented on that committee. International organizations, governmental and non-go
12、vernmental, 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
13、 The main task of technical committees is to prepare International Standards. 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 the member bodies casting a v
14、ote. 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 identifying any or all such patent rights. ISO 11057 was prepared by Technical Committee ISO/TC 146, Air quality, Subcommittee SC 1, Statio
15、nary source emissions. BS ISO 11057:2011ISO 11057:2011(E) ISO 2011 All rights reserved vIntroduction Cleanable filters are usually employed for the separation of particles from gases containing dust concentrations in the range of some hundred milligrams per cubic metre up to some hundred grams per c
16、ubic metre. Depending on the inlet dust concentrations concerned, a dust cake is more or less rapidly formed upon the surface of the filter medium which is periodically removed in order to maintain the filtration process. With most filters in use at the time of publication, this is usually accomplis
17、hed by injecting a pulse of compressed air from the clean-gas side, i.e. inside the filter bag or cartridge. The design service life of these filters is usually 2 years to 4 years. They provide clean-gas concentrations of some milligrams per cubic metre without an excessive rise in residual pressure
18、 drop for the cleaned filter and a low cleaning frequency, respectively. Although extensive investigations have been carried out concerning the operating conditions and design of filters and cleaning systems as well as the design and selection of the filter media (References 14 to 17), the layout an
19、d operation of bag filters are still extensively based on data which were empirically obtained in industrial-sized installations or pilot plants. The systematic characterization and evaluation of filter media with respect to their relevant long-term operational properties (filtration and cleaning be
20、haviour) and emission, in addition to their well-defined textile properties, are still a major problem not only for the developers and manufacturers of filter media, but also for the producers and users of filter installations. Therefore there is a demand for improved methods for the characterizatio
21、n and evaluation of cleanable filter media. This demand concerns data allowing statements about the filtration properties of a medium in long-term operation, which exceed the data supplied by filter media manufacturers about the non-dusted material. This International Standard is based on VDI 3926 P
22、art 1:200413, ASTM D6830-02:20088, JIS Z 8909-1:200510, and GB/T 6719:20099. BS ISO 11057:2011BS ISO 11057:2011INTERNATIONAL STANDARD ISO 11057:2011(E) ISO 2011 All rights reserved 1Air quality Test method for filtration characterization of cleanable filter media 1 Scope This International Standard
23、specifies a standard reference test method for the comparative characterization of pulse-jet cleanable filter media, to be used in filter elements (e.g. bag filters, pocket filters, cartridge filters) applied in dry gas cleaning under standardized test conditions. The main purpose of testing is to g
24、ain information about both the operational performance and the particle emission of cleanable filter media. It should be noted that while one test apparatus and operating method has been chosen and described herein, it is recognized that other apparatus and operating arrangements can be found accept
25、able. In order for a candidate apparatus to become an equivalent apparatus, a comparison has to be performed with the standard reference apparatus according to a specified procedure (6.1). The test procedure, the characteristics of the required test facility, and the test conditions, as well as the
26、evaluation and presentation of the results, are specified. The results obtained from this test method are not intended for prediction of the absolute performance of full-scale filter facilities. However, they are helpful for the selection and development of appropriate cleanable filter media and the
27、 identification of suitable operating parameters. Additional tasks such as verifying filter media concerning PM2,5emissions, the classification of different media according to their filtration performance or the cleanability and durability of filter elements (i.e. projection of bag lifetime) can be
28、addressed using the test method specified. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 aerosol suspension in a gaseous medium of solid particles, liquid particles or solid and liquid particles having a negligible falling velocity ISO 4225
29、:19942, 3.2 2.2 ageing air quality process applied to a filter medium to simulate long-term filter operation NOTE Examples of changes in process behaviour are pressure drop and cycle time. 2.3 filter face velocity flow rate (under operating conditions) of gas through the exposed filter area divided
30、by that area NOTE 1 Other frequently used terms are: air-to-cloth ratio and gas-to-cloth ratio. NOTE 2 Filter face velocity is often expressed in cubic metres per square metre hour, i.e. metres per hour. Alternative units are metres per minute or feet per minute (deprecated). BS ISO 11057:2011ISO 11
31、057:2011(E) 2 ISO 2011 All rights reserved2.4 calibration air filtration characterization comparison of a measuring device (e.g. an optical particle counter) with another instrument for reference measurements using, for example, a reference test aerosol with the objective of an exact determination o
32、f an experimental parameter 2.5 clean gas gas flow exiting the filter 2.6 cleanable filter medium filter medium whose aerodynamic and particle collection characteristics are regeneratable or recoverable 2.7 Particle concentration 2.7.1 particle number concentration air filtration characterization to
33、tal number of particles per carrier gas volume NOTE Particle number concentration is expressed in particle numbers per cubic metre or reciprocal cubic metres. 2.7.2 particle mass concentration total mass of particles per carrier gas volume NOTE Particle number concentration is expressed in grams per
34、 cubic metre. 2.8 cycle time air quality time between two cleaning pulses under defined operational conditions 2.9 detection limit of the clean gas concentration air filtration characterization minimum concentration in the clean gas which can be unambiguously determined by the described gravimetric
35、method 2.10 dirty gas dust-loaded gas which is fed into the inlet side of the filter 2.11 dispersion air gas flow necessary for the dispersion of test dust, i.e. for the transformation of test dust into an aerosol NOTE Dispersion air needs to be dry, oil-free, and at constant temperature and gas flo
36、w rate. 2.12 dust collection efficiency mass of particulate material collected by the filter divided by the mass of inlet particulate material 2.13 equivalent particle diameter air filtration characterization particle size obtained on the basis of a specific method of measurement, and expressed in t
37、erms of the diameter of an “equivalent” sphere for that respective method NOTE 1 Examples of specific measurements are: projected area, surface area, volume, mass, settling velocity or relaxation time, electrical mobility, scattered light intensity, and diffusion rate. NOTE 2 It is in the nature of
38、this definition that different measurement methods can produce equivalent diameters which do not necessarily coincide. Some of the relevant equivalent diameters are defined in 2.14 to 2.16. BS ISO 11057:2011ISO 11057:2011(E) ISO 2011 All rights reserved 32.14 aerodynamic diameter air filtration char
39、acterization measure of size for a particle of non-defined shape and density defined on the basis of settling velocity or inertial behaviour (both lead to the same equivalent diameter), which is also relevant for the separation behaviour of particles by inertial effects NOTE 1 The aerodynamic diamet
40、er is based on an equivalent sphere of density = 1 000 kg/m3. NOTE 2 Typical measuring methods employ impactors or particle classifiers. 2.15 equivalent light-scattering particle diameter measure of size for a particle of non-defined shape obtained on the basis of the scattered light signal detected
41、 by an optical particle counter, reflecting the diameter of an equivalent sphere of the aerosol (usually latex particles) used for the calibration of the measuring device 2.16 volume equivalent particle diameter diameter of a sphere of the same volume as the unknown particle 2.17 exposed filter area
42、 cross-sectional area of a filter medium which is directly exposed to the gas flow during the test 2.18 feed rate stability measure of the degree of deviation of mass flow rate of the solid from the nominal value NOTE The value obtained for the feed rate stability depends on the duration of the meas
43、urement, which itself can vary substantially from case to case (short or long time feeding). 2.19 filter face upstream side of the filter medium where the dust is deposited during operation 2.20 filter medium material separating particulate material from gases characterized by its separating structu
44、re and its structural and/or textile-technological characteristics 2.21 filtration characterization air filtration characterization determination of certain aerodynamic behaviour of a filter medium as it collects and rejects particulate material from a moving gas stream by measuring parameters, incl
45、uding pressure drop characteristic, development of residual pressure drop, cycle time, residual dust loading, and dust emission 2.22 nominal gas flow rate air quality flow rate determined (for the most part by the manufacturer) for a filter medium to be tested 2.23 operating gas flow rate flow rate
46、existing at the current operating conditions relating to temperature, pressure, humidity, gaseous composition or dust concentration 2.24 standard gas flow rate flow rate under standard conditions, i.e. standard temperature, Tn= 273,15 K (0 C) and standard pressure, pn= 1 013,25 hPa NOTE Additional s
47、pecifications, e.g. for the humidity of the gases, are indicated separately. BS ISO 11057:2011ISO 11057:2011(E) 4 ISO 2011 All rights reserved2.25 mixing section part of the test apparatus (often the dirty-gas duct), which ensures that, over the duration of the test, concentration and dispersion of
48、the test dust in the gas stream (i.e. the test aerosol) remain constant and homogeneous when arriving at the test filter NOTE The particle size distribution and concentration can vary due to changes in the dust properties or in the device parameters of the dust generator and this can affect the unif
49、ormity of the dust distribution on the filter surface. 2.26 particle air filtration characterization small contiguous object in the solid or liquid state of aggregation that can be transported in the gas flow as a single unit NOTE Since in practice particles very often present an irregular shape, it is difficult to assign simple geometric dimensions to them. This problem can be bypassed by specifying an equivalent diameter for a particle. 2.27 particle separator dust collector air filtration character
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