1、BS EN 14792:2017Stationary source emissions Determination of mass concentration of nitrogen oxides Standard reference method: ChemiluminescenceBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 14792:2017 BRITISH STANDARDNational forewordThis British Standard is t
2、he UK implementation of EN 14792:2017.It supersedes BS EN 14792:2005 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EH/2/1, Stationary source emission.A list of organizations represented on this committee can be obtained on request to its secretary.Th
3、is publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 85051 6 ICS 13.040.40 Compliance with a British Standard cannot confe
4、r immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 14792:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1
5、4792 January 2017 ICS 13.040.40 Supersedes EN 14792:2005English Version Stationary source emissions - Determination of mass concentration of nitrogen oxides - Standard reference method: chemiluminescence Emissions de sources fixes - Dtermination de la concentration massique des oxydes dazote - Mthod
6、e de rfrence normalise : chimiluminescence Emissionen aus stationren Quellen - Bestimmung der Massenkonzentration von Stickstoffoxiden - Standardreferenzverfahren: Chemilumineszenz This European Standard was approved by CEN on 26 September 2016. CEN members are bound to comply with the CEN/CENELEC I
7、nternal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to
8、any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official
9、 versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Nor
10、way, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights
11、 of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14792:2017 EBS EN 14792:2017EN 14792:2017 (E) 2 Contents Page European foreword . 5 1 Scope 6 2 Normative references 6 3 Terms and definitions . 7 4 Symbols and abbreviations 13 4.1 Symbols 13 4.2
12、Abbreviated terms . 14 5 Principle 14 5.1 General . 14 5.2 Measuring principle 14 6 Description of the measuring system . 15 6.1 General . 15 6.2 Sampling and sample gas conditioning system . 16 6.2.1 Sampling probe . 16 6.2.2 Filter 17 6.2.3 Sample gas line 17 6.2.4 Sample gas conditioning system .
13、 17 6.2.5 Sample gas pump 18 6.2.6 Secondary filter . 18 6.2.7 Flow controller and flow meter 18 6.3 Analyser equipment 18 6.3.1 General . 18 6.3.2 Converter 19 6.3.3 Ozone generator . 19 6.3.4 Reaction chamber 19 6.3.5 Optical filter . 19 6.3.6 Photomultiplier tube 20 6.3.7 Ozone removal 20 7 Perfo
14、rmance characteristics of the SRM 20 8 Suitability of the measuring system to the measurement task . 21 9 Field operation 22 9.1 Measurement planning 22 9.2 Sampling strategy. 22 9.2.1 General . 22 9.2.2 Measurement section and measurement plane 22 9.2.3 Minimum number and location of measurement po
15、ints . 22 9.2.4 Measurement ports and working platform 22 9.3 Choice of the measuring system . 23 9.4 Setting of the measuring system on site 23 9.4.1 General . 23 9.4.2 Preliminary zero and span check, and adjustments . 23 9.4.3 Zero and span checks after measurement 24 BS EN 14792:2017EN 14792:201
16、7 (E) 3 10 Ongoing quality control 25 10.1 General . 25 10.2 Frequency of checks 25 11 Expression of results . 26 12 Equivalence of an alternative method 27 13 Measurement report . 27 Annex A (informative) Validation of the method in the field . 28 A.1 General . 28 A.2 Characteristics of installatio
17、ns 28 A.3 Repeatability and reproducibility in the field 29 A.3.1 General . 29 A.3.2 Repeatability 30 A.3.3 Reproducibility 31 Annex B (informative) Sampling and conditioning configurations . 32 Annex C (normative) Determination of conversion efficiency . 33 C.1 General . 33 C.2 First method: cylind
18、er gases for calibration . 33 C.3 Second method: gaseous phase titration . 33 Annex D (informative) Examples of different types of converters . 35 D.1 Quartz converter . 35 D.2 Low temperature converter (molybdenum) 35 D.3 Stainless steel converter 35 Annex E (informative) Calculation of the uncerta
19、inty associated with a concentration expressed for dry gas and at an oxygen reference concentration 36 E.1 Uncertainty associated with a concentration expressed on dry gas 36 E.2 Uncertainty associated with a concentration expressed at a oxygen reference concentration . 38 Annex F (informative) Exam
20、ple of assessment of compliance of chemiluminescence method for NOxwith requirements on emission measurements 40 F.1 General . 40 F.2 Elements required for the uncertainty determinations . 40 F.2.1 Model equation 40 F.2.2 Combined uncertainty 41 F.2.3 Expanded uncertainty . 41 F.2.4 Determination of
21、 uncertainty contributions in case of rectangular distributions . 43 F.2.5 Determination of uncertainty contributions by use of sensitivity coefficients . 44 F.3 Example of an uncertainty calculation 44 F.3.1 Site specific conditions . 44 BS EN 14792:2017EN 14792:2017 (E) 4 F.3.2 Performance charact
22、eristics of the method . 45 F.3.3 Calculation of concentration values 46 F.3.4 Determination of the uncertainty contributions 47 F.3.5 Result of uncertainty calculation . 50 F.3.5.1 Standard uncertainties 50 F.3.5.2 Combined uncertainty 51 F.3.5.3 Expanded uncertainty 52 F.3.5.4 Evaluation of the co
23、mpliance with the required measurement quality 52 Annex G (informative) Example of correction of data from drift effect . 53 Annex H (informative) Significant technical changes 55 Bibliography . 56 BS EN 14792:2017EN 14792:2017 (E) 5 European foreword This document (EN 14792:2017) has been prepared
24、by Technical Committee CEN/TC 264 “Air quality”, the secretariat of which is held by DIN. This document supersedes EN 14792:2005. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2017, and con
25、flicting national standards shall be withdrawn at the latest by July 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. Annex H pro
26、vides details of significant technical changes between this document and the previous edition. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus
27、, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
28、United Kingdom. BS EN 14792:2017EN 14792:2017 (E) 6 1 Scope This European Standard specifies the standard reference method (SRM) based on the chemiluminescence principle for the determination of the nitrogen oxides (NOx) in flue gases emitted to the atmosphere from ducts and stacks. It includes the
29、sampling and the gas conditioning system, as well as the analyser. This European Standard specifies the characteristics to be determined and the performance criteria to be fulfilled by portable automated measuring systems (P-AMS) based on this measurement method. It applies for periodic monitoring a
30、nd for the calibration or control of automated measuring systems (AMS) permanently installed on a stack, for regulatory or other purposes. This European Standard specifies criteria for demonstration of equivalence of an alternative method to the SRM by application of EN 14793:2017. This European Sta
31、ndard has been validated during field tests on waste incineration, co-incineration and large combustion installations and on a recognized test-bench. It has been validated for sampling periods of 30 min in the range of 0 mg/m3to 1 300 mg/m3of NOxfor large combustion plants and 0 mg/m3to 400 mg/m3of
32、NOxfor waste incineration, according to emission limit values (ELV) laid down in the Directive 2010/75/EU. The ELV for NOx(NO + NO2) in EU Directives is expressed in mg/m3of NO2on a dry basis, at a specified value for oxygen and at standard conditions (273 K and 101,3 kPa). NOTE The characteristics
33、of installations, the conditions during field tests and the values of repeatability and reproducibility in the field are given in Annex A. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For d
34、ated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 14793:2017, Stationary source emission Demonstration of equivalence of an alternative method with a reference method EN 15259:2007, Air qualit
35、y - Measurement of stationary source emissions - Requirements for measurement sections and sites and for the measurement objective, plan and report EN 15267-4:2017, Air quality Certification of automated measuring systems Part 4: Performance criteria and test procedures for automated measuring syste
36、ms for periodic measurements of emissions from stationary sources EN ISO 14956:2002, Air quality - Evaluation of the suitability of a measurement procedure by comparison with a required measurement uncertainty (ISO 14956:2002) ISO/IEC Guide 98-3:2008, Uncertainty of measurement Part 3: Guide to the
37、expression of uncertainty in measurement (GUM:1995) BS EN 14792:2017EN 14792:2017 (E) 7 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. NOTE In this European Standard, NOxis defined as the sum of NO and NO2. The mass concentration of NOxis expres
38、sed as the equivalent NO2concentration in milligrams per cubic metre at standard conditions. 3.1 standard reference method SRM reference method prescribed by European or national legislation SOURCE: EN 15259:2007 3.2 reference method RM measurement method taken as a reference by convention, which gi
39、ves the accepted reference value of the measurand Note 1 to entry: A reference method is fully described. Note 2 to entry: A reference method can be a manual or an automated method. Note 3 to entry: Alternative methods can be used if equivalence to the reference method has been demonstrated. SOURCE:
40、 EN 15259:2007 3.3 measurement method method described in a written procedure containing all the means and procedures required to sample and analyse, namely: field of application, principle and/or reactions, definitions, equipment, procedures, presentation of results, and other requirements and meas
41、urement report SOURCE: EN 14793:2017 3.4 alternative method AM measurement method which complies with the criteria given by this European Standard with respect to the reference method Note 1 to entry: An alternative method can consist of a simplification of the reference method. SOURCE: EN 14793:201
42、7 3.5 measuring system set of one or more measuring instruments and often other devices, including any reagent and supply, assembled and adapted to give information used to generate measured quantity values within specified intervals for quantities of specified kinds SOURCE: JCGM 200:2012 BS EN 1479
43、2:2017EN 14792:2017 (E) 8 3.6 automated measuring system AMS entirety of all measuring instruments and additional devices for obtaining a result of measurement Note 1 to entry: Apart from the actual measuring device (the analyser), an AMS includes facilities for taking samples (e.g. probe, sample ga
44、s lines, flow meters and regulator, delivery pump) and for sample conditioning (e.g. dust filter, pre-separator for interferents, cooler, converter). This definition also includes testing and adjusting devices that are required for functional checks and, if applicable, for commissioning. Note 2 to e
45、ntry: The term “automated measuring system” (AMS) is typically used in Europe. The term “continuous emission monitoring system” (CEMS) is also typically used in the UK and USA. SOURCE: EN 15267-4:2017 3.7 portable automated measuring system P-AMS automated measuring system which is in a condition or
46、 application to be moved from one to another measurement site to obtain measurement results for a short period Note 1 to entry: The measurement period is typically 8 h for a day. Note 2 to entry: The P-AMS can be configured at the measurement site for the special application but can be also set-up i
47、n a van or mobile container. The probe and the sample gas lines are installed often just before the measurement task is started. SOURCE: EN 15267-4:2017 3.8 calibration set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measurin
48、g method or measuring system, and the corresponding values given by the applicable reference Note 1 to entry: In case of automated measuring system (AMS) permanently installed on a stack the applicable reference is the standard reference method (SRM) used to establish the calibration function of the
49、 AMS. Note 2 to entry: Calibration should not be confused with adjustment of a measuring system. 3.9 adjustment set of operations carried out on a measuring system so that it provides prescribed indications corresponding to given values of a quantity to be measured Note 1 to entry: The adjustment can be made directly on the instrument or using a suitable calculation procedure. 3.10 span gas test gas used to adjust and check a specific point on the response line of the measuring system BS EN 14792:2017EN 14792:2017 (E) 9 3.11 measurand particular q
