1、May 2012 Translation by DIN-Sprachendienst.English price group 15No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 13
2、.040.40!$|0“1892713www.din.deDDIN ISO 11057Air quality Test method for filtration characterization of cleanable filter media(ISO 11057:2011)English translation of DIN ISO 11057:2012-05Emissionen aus stationren Quellen Prfverfahren fr die Charakterisierung des Filtrationsverhaltens abreinigbarerFilte
3、rmedien (ISO 11057:2011)Englische bersetzung von DIN ISO 11057:2012-05Qualit de lair Mthode dessai pour la caractrisation de la filtration des filtres lavables(ISO 11057:2011)Traduction anglaise de DIN ISO 11057:2012-05SupersedesDIN ISO 11057:2011-12www.beuth.deDocument comprises pagesIn case of dou
4、bt, the German-language original shall be considered authoritative.This standard has been included in the VDI/DIN Handbook on air quality, Volume 6.3505.12 DIN ISO 11057:2012-05 A comma is used as the decimal marker. Contents Page National foreword .3 Introduction .4 1 Scope 5 2 Terms and definition
5、s .5 3 Gases and materials 9 4 Principle . 10 5 Standard reference apparatus and procedure 10 5.1 General . 10 5.2 Components of the standard reference apparatus . 13 5.3 Operating parameters for the test . 15 5.4 Measured parameters . 16 5.5 Test sequences . 16 5.6 Test preparations and environment
6、 . 17 5.7 Step-by-step procedures of the standard test . 21 6 Procedure and filter media for testing of equivalent apparatus and selection of test houses . 22 6.1 Procedure and filter media for testing of equivalent apparatus with the standard reference apparatus . 22 6.2 Selection of test houses 22
7、 7 Processing of data and presentation of results 23 7.1 Processing of data 23 7.2 Presentation of results . 23 Annex A (normative) Test apparatus . 28 Annex B (informative) Other information and considerations 32 Bibliography . 34 2 DIN ISO 11057:2012-05 National foreword This standard has been pre
8、pared by Technical Committee ISO/TC 146 “Air quality”, Subcommittee SC 1 “Stationary source emissions”, Working Group WG 23 “Test method for cleanable filter media” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Kommission Reinhaltung der Luft (KRdL) im
9、VDI und DIN Normenausschuss, Fachbereich 1 Umweltschutztechnik (Commission on Air Pollution Prevention of VDI and DIN Standards Committee, Section 1 Environmental protection technology). The method specified in this standard is based on VDI 3926 Part 1. Application 1 given in VDI 3926 Part 1 is take
10、n here as the standard reference method. Other methods are permitted provided that they fullfil the equivalence criteria. For this reason, VDI 3926 Part 1 will not be withdrawn since application 2 may be used as an equivalence method. Amendments This standard differs from DIN ISO 11057:2011-12 as fo
11、llows: a) the standard has been editorially revised in its entirety. Previous editions DIN ISO 11057:2011-12 3 Introduction 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 s
12、ome hundred grams per cubic 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, th
13、is is usually accomplished 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 ri
14、se in residual pressure 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 1
15、4 to 17), the layout and 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 (fil
16、tration and cleaning behaviour) 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
17、for the characterization 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
18、 is based on VDI 3926 Part 1:200413, ASTM D6830-02:20088, JIS Z 8909-1:200510, and GB/T 6719:20099. Air quality Test method for filtration characterization of cleanable filter media DIN ISO 11057:2012-05 4 1 Scope This International Standard specifies a standard reference test method for the compara
19、tive 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 gain information about both the operational performance and
20、 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 acceptable. In order for a candidate apparatus to become an equi
21、valent 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 evaluation and presentation of the results, are specified.
22、 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 identification of suitable operating parameters. Addition
23、al 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 addressed using the test method specified. 2 Terms and def
24、initions 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 4225:19942, 3.2 2.2 ageing air quality process applied to a fi
25、lter 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 by that area NOTE 1 Other frequently used terms are: air-t
26、o-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). DIN ISO 11057:2012-05 5 2.4 calibration air filtration characterization compariso
27、n 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 of an experimental parameter 2.5 clean gas gas flow exiting the filter 2.6 cleanable filter medium f
28、ilter medium whose aerodynamic and particle collection characteristics are regeneratable or recoverable 2.7 Particle concentration 2.7.1 particle number concentration air filtration characterization total number of particles per carrier gas volume NOTE Particle number concentration is expressed in p
29、article 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 cubic metre. 2.8 cycle time air quality time between two cleaning pulses under defined operational
30、 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 method 2.10 dirty gas dust-loaded gas which is fed into the inlet side of the filter 2.11 dispersio
31、n 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 flow rate. 2.12 dust collection efficiency mass of particulate material collected by the filter divide
32、d 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 terms of the diameter of an “equivalent” sphere for that respective method NOTE 1 Examples of specif
33、ic 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 this definition that different measurement methods can produce equivalent diameters which do not ne
34、cessarily coincide. Some of the relevant equivalent diameters are defined in 2.14 to 2.16. DIN ISO 11057:2012-05 6 2.14 aerodynamic diameter air filtration characterization measure of size for a particle of non-defined shape and density defined on the basis of settling velocity or inertial behaviour
35、 (both lead to the same equivalent diameter), which is also relevant for the separation behaviour of particles by inertial effects NOTE 1 The aerodynamic diameter is based on an equivalent sphere of density = 1 000 kg/m3. NOTE 2 Typical measuring methods employ impactors or particle classifiers. 2.1
36、5 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 by an optical particle counter, reflecting the diameter of an equivalent sphere of the aerosol (usually latex particles) used for the calib
37、ration 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 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 d
38、egree 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 measurement, which itself can vary substantially from case to case (short or long time feeding). 2.19 filter face upstream side of the filter me
39、dium where the dust is deposited during operation 2.20 filter medium material separating particulate material from gases characterized by its separating structure and its structural and/or textile-technological characteristics 2.21 filtration characterization air filtration characterization determin
40、ation of certain aerodynamic behaviour of a filter medium as it collects and rejects particulate material from a moving gas stream by measuring parameters, including pressure drop characteristic, development of residual pressure drop, cycle time, residual dust loading, and dust emission 2.22 nominal
41、 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 existing at the current operating conditions relating to temperature, pressure, humidity, gaseous composition or dust concentration 2.24 sta
42、ndard 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 specifications, e.g. for the humidity of the gases, are indicated separately. DIN ISO 11057:2012-05 7 2.25 mixing section part of the test ap
43、paratus (often the dirty-gas duct), which ensures that, over the duration of the test, concentration and dispersion of 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 va
44、ry due to changes in the dust properties or in the device parameters of the dust generator and this can affect the uniformity 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
45、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
46、 air filtration characterization device for the removal of particles from a gaseous medium 2.28 particle size distribution air quality correlation between the quantity of the size fractions and particle size NOTE 1 Distributions are not characterized adequately by only specifying the parameters char
47、acterizing the position of the distribution, such as median, mode or the mass median aerodynamic diameter. In addition, at least a specification relative to the width of distribution is required for which the standard deviation of pairs of variables, such as the minimum, xmin, and the maximum, xmax,
48、 particle diameters or better (since they allow a more precise measurement) x0,05and x0,95, could be of use. NOTE 2 Furthermore, for the unambiguous evaluation of a distribution, the type of measured quantity needs to be exactly defined. Also, the equivalent diameter, the measuring method and the test apparatus are to be specified. It is for instance not sufficient to state “optical particle counter with 90 detection”. In this case, the nature of the light source (laser or white light) and details of the shape of
