1、BS EN 14790:2017Stationary source emissions Determination of the watervapour in ducts Standardreference methodBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 14790:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 14790:
2、2017.It supersedes BS EN 14790:2005 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EH/2/1, Stationary source emission.A list of organizations represented on this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.This publication does not purport t
3、o 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 85052 3 ICS 13.040.40 Compliance with a British Standard cannot confer immunity from legal obligations
4、.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 14790:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14790 January 2017 ICS 13.040.40 S
5、upersedes EN 14790:2005English Version Stationary source emissions - Determination of the water vapour in ducts - Standard reference method Emissions de sources fixes - Dtermination de la vapeur deau dans les conduits - Mthode de rfrence normalise Emissionen aus stationren Quellen - Bestimmung von W
6、asserdampf in Kanlen - StandardreferenzverfahrenThis European Standard was approved by CEN on 26 September 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any al
7、teration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language m
8、ade 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 versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Est
9、onia, 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 United Kingdom. EUROPEAN COMMITTEE
10、 FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14790:2017 EBS EN 14790:2017EN
11、 14790:2017 (E) 2 Contents Page European foreword . 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 6 4 Symbols and abbreviations 11 4.1 Symbols 11 4.2 Abbreviated terms . 12 5 Principle 12 5.1 General . 12 5.2 Adsorption or condensation/adsorption method 12 5.3 Temperature method . 1
12、2 6 Description of the measuring system . 13 6.1 General . 13 6.2 Sampling probe . 13 6.3 Filter housing . 13 6.4 Particle filter 14 6.5 Trapping system . 14 6.6 Cooling system (optional) . 14 6.7 Sample gas pump 14 6.8 Gas volume meter 14 6.9 Barometer . 15 6.10 Balance . 15 6.11 Temperature measur
13、ement . 15 7 Performance characteristics of the SRM 15 8 Field operation 16 8.1 Measurement planning 16 8.2 Sampling strategy. 17 8.2.1 General . 17 8.2.2 Measurement section and measurement plane 17 8.2.3 Minimum number and location of measurement points . 17 8.2.4 Measurement ports and working pla
14、tform 17 8.3 Assembling the equipment . 17 8.4 Leak test. 18 8.5 Performing sampling 18 8.5.1 Introduction of the sampling probe in the duct 18 8.5.2 Sampling 18 8.6 Repeatability of the weighing 19 8.7 Procedure for gas streams saturated with water (droplets present) . 19 9 Water vapour determinati
15、on . 19 10 Equivalence of an alternative method 21 11 Measurement report . 21 BS EN 14790:2017EN 14790:2017 (E) 3 Annex A (informative) Validation of the method in the field . 22 A.1 General . 22 A.2 Characteristics of installations 22 A.3 Repeatability and reproducibility in the field 23 A.3.1 Gene
16、ral . 23 A.3.2 Repeatability 24 A.3.3 Reproducibility 25 Annex B (normative) Determination of water vapour concentration for water saturated gas, at pref= 101,325 kPa 26 Annex C (informative) Type of sampling equipment 30 Annex D (informative) Example of assessment of compliance of standard referenc
17、e method for water vapour with given uncertainty requirements 31 D.1 General . 31 D.2 Elements required for the uncertainty determinations . 31 D.3 Example of an uncertainty calculation 31 D.3.1 Specific conditions in the field . 31 D.3.2 Performance characteristics 32 D.3.3 Model equation and appli
18、cation of the rule of the uncertainty propagation . 34 D.3.3.1 Water vapour content . 34 D.3.3.2 Effect of the collection efficiency . 35 D.3.3.3 Calculation of the combined uncertainty of the water vapour content taking into account the collection efficiency . 35 D.3.3.4 Calculation of sensitivity
19、coefficients 36 D.3.3.5 Calculation of the standard uncertainty of the collection efficiency . 36 D.3.3.6 Calculation of the standard uncertainty of measured dry gas volume corrected to standard conditions . 37 D.3.3.7 Calculation of the combined uncertainty of the water vapour content 38 D.3.3.8 Re
20、sults of standard uncertainties calculations 38 D.3.4 Estimation of the combined uncertainty 41 Annex E (informative) Significant technical changes . 42 Bibliography . 43 BS EN 14790:2017EN 14790:2017 (E) 4 European foreword This document (EN 14790:2017) has been prepared by Technical Committee CEN/
21、TC 264 “Air quality”, the secretariat of which is held by DIN. This document supersedes EN 14790:2005. 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 conflicting national standards
22、 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 E provides details of significan
23、t 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, Czech Republic, Denmark,
24、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 United Kingdom. BS EN 14790
25、:2017EN 14790:2017 (E) 5 1 Scope This European Standard specifies the standard reference method (SRM) based on a sampling system with a condensation/adsorption technique to determine the water vapour concentration in the flue gases emitted to atmosphere from ducts and stacks. This European Standard
26、specifies the performance characteristics to be determined and performance criteria to be fulfilled by measuring systems based on the measurement method. It applies to periodic monitoring and to the calibration or control of automated measuring systems (AMS) permanently installed on a stack, for reg
27、ulatory 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 Standard is applicable in the range of water vapour content from 4 % to 40 % as volume concentrations and of water
28、vapour mass concentration from 29 g/m3to 250 g/m3as a wet gas, although for a given temperature the upper limit of the method is related to the maximum pressure of water in air or in the gas. In this European Standard all the concentrations are expressed at standard conditions (273 K and 101,3 kPa).
29、 NOTE 1 For saturated conditions the condensation/adsorption method is not applicable. Some guidance is given in this European Standard to deal with flue gas when droplets are present. This European Standard has been validated during field tests on waste incineration, co-incineration and large combu
30、stion plants. It has been validated for sampling periods of 30 min in the volume concentration range of 7 % to 26 %. NOTE 2 The characteristics of installations, the conditions during field tests and the values of repeatability and reproducibility in the field are given in Annex A. 2 Normative refer
31、ences The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. E
32、N 1911, Stationary source emissions - Determination of mass concentration of gaseous chlorides expressed as HCl - Standard reference method EN 14791:2017, Stationary source emissions Determination of mass concentration of sulphur oxides Standard reference method EN 14793:2017, Stationary source emis
33、sion Demonstration of equivalence of an alternative method with a reference method EN 15259:2007, Air quality - Measurement of stationary source emissions - Requirements for measurement sections and sites and for the measurement objective, plan and report ISO/IEC Guide 98-3:2008, Uncertainty of meas
34、urement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) BS EN 14790:2017EN 14790:2017 (E) 6 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 standard reference method SRM reference method prescribed by European or nati
35、onal legislation SOURCE: EN 15259:2007 3.2 reference method RM measurement method taken as a reference by convention, which gives 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
36、method. Note 3 to entry: Alternative methods can be used if equivalence to the reference method has been demonstrated. SOURCE: 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 applicat
37、ion, principle and/or reactions, definitions, equipment, procedures, presentation of results, other requirements and measurement 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 me
38、thod Note 1 to entry: An alternative method can consist of a simplification of the reference method. SOURCE: EN 14793:2017 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 genera
39、te measured quantity values within specified intervals for quantities of specified kinds SOURCE: JCGM 200:2012 BS EN 14790:2017EN 14790:2017 (E) 7 3.6 automated measuring system AMS entirety of all measuring instruments and additional devices for obtaining a result of measurement Note 1 to entry: Ap
40、art from the actual measuring device (the analyser), an AMS includes facilities for taking samples (e.g. probe, sample gas 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
41、 testing and adjusting devices that are required for functional checks and, if applicable, for commissioning. Note 2 to entry: 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. SO
42、URCE: EN 15267-4:2017 3.7 calibration set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring method or measuring system, and the corresponding values given by the applicable reference Note 1 to entry: In case of automated
43、measuring systems (AMS) permanently installed on a stack the applicable reference is the standard reference method (SRM) used to establish the calibration function of the AMS. Note 2 to entry: In case of manual methods the applicable reference can be reference materials used as calibration standards
44、 to establish the relationship between the output signal of the analytical device and the reference values. Note 3 to entry: Calibration should not be confused with adjustment of a measuring system. 3.8 measurand particular quantity subject to measurement SOURCE: EN 15259:2007 Note 1 to entry: The m
45、easurand is a quantifiable property of the stack gas under test, for example mass concentration of a measured component, temperature, velocity, mass flow, oxygen content and water vapour content. 3.9 measurement site place on the waste gas duct in the area of the measurement plane(s) consisting of s
46、tructures and technical equipment, for example working platforms, measurement ports, energy supply Note 1 to entry: Measurement site is also known as sampling site. SOURCE: EN 15259:2007 3.10 measurement plane plane normal to the centre line of the duct at the sampling position Note 1 to entry: Meas
47、urement plane is also known as sampling plane. SOURCE: EN 15259:2007 BS EN 14790:2017EN 14790:2017 (E) 8 3.11 measurement port opening in the waste gas duct along the measurement line, through which access to the waste gas is gained Note 1 to entry: Measurement port is also known as sampling port or
48、 access port. SOURCE: EN 15259:2007 3.12 measurement line line in the measurement plane along which the measurement points are located, bounded by the inner duct wall Note 1 to entry: Measurement line is also known as sampling line. SOURCE: EN 15259:2007 3.13 measurement point position in the measur
49、ement plane at which the sample stream is extracted or the measurement data are obtained directly Note 1 to entry: Measurement point is also known as sampling point. SOURCE: EN 15259:2007 3.14 absorber device in which water vapour is absorbed 3.15 droplets small liquid particles of condensed water vapour or water liquid in the flue gas (e.g. coming from a scrubber) Note 1 to entry: In adiabatic equilibrium conditions, droplets could arise only if a gas stream is saturated with water. 3.16 dew point temperature below which the condensation
