BS EN ISO 12213-3-2009 Natural gas - Calculation of compression factor - Calculation using physical properties《天然气 压缩因子的计算 物理性能计算》.pdf

1、BS EN ISO12213-3:2009ICS 75.060NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDNatural gas Calculation ofcompression factorPart 3: Calculation using physicalproperties (ISO 12213-3:2006)This British Standardwas published underthe authority of theStandards Policy

2、 andStrategy Committee on 30September 2009 BSI 2009ISBN 978 0 580 67148 7Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 12213-3:2009National forewordThis British Standard is the UK implementation of EN ISO12213-3:2009. It is identical to ISO 12213-3:2006. It supersedes BS ENISO

3、 12213-3:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/15, Natural gas and gas analysis.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the nece

4、ssary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 12213-3 September 2009 ICS 75.060 Supersedes EN ISO 12213-3:2005English Version Na

5、tural gas - Calculation of compression factor - Part 3: Calculation using physical properties (ISO 12213-3:2006) Gaz naturel - Calcul du facteur de compression - Partie 3: Calcul partir des caractristiques physiques (ISO 12213-3:2006) Erdgas - Berechnung von Realgasfaktoren - Teil 3: Berechnungen ba

6、sierend auf physikalischen Stoffeigenschaften als Eingangsgren (ISO 12213-3:2006) This European Standard was approved by CEN on 13 August 2009. 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 n

7、ational standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version

8、in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmar

9、k, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATI

10、ON EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 12213-3:2009: EBS EN ISO 12213-3:2009EN ISO 12213-3:2009 (E) 3 Foreword The text of ISO

11、 12213-3:2006 has been prepared by Technical Committee ISO/TC 193 “Natural gas” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 12213-3:2009. This European Standard shall be given the status of a national standard, either by publication of an identical t

12、ext or by endorsement, at the latest by March 2010, and conflicting national standards shall be withdrawn at the latest by March 2010. 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 responsibl

13、e for identifying any or all such patent rights. This document supersedes EN ISO 12213-3:2005. 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, Cyprus, Czech R

14、epublic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 12213-3:2006

15、has been approved by CEN as a EN ISO 12213-3:2009 without any modification. BS EN ISO 12213-3:2009ISO 12213-3:2006(E) ISO 2006 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Method of calculation. 2 4.1 Principle. 2 4.2 The SGERG-

16、88 equation 2 4.3 Input variables. 3 4.4 Ranges of application. 3 4.5 Uncertainty 5 5 Computer program . 6 Annex A (normative) Symbols and units. 7 Annex B (normative) Description of the SGERG-88 method. 10 Annex C (normative) Example calculations 21 Annex D (normative) Conversion factors 22 Annex E

17、 (informative) Specification for pipeline quality natural gas . 25 Annex F (informative) Performance over wider ranges of application . 28 Annex G (informative) Subroutine SGERG.FOR in Fortran . 33 Bibliography . 38 BS EN ISO 12213-3:2009ISO 12213-3:2006(E) iv ISO 2006 All rights reservedForeword IS

18、O (the International Organization 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 co

19、mmittee has been established 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 electro

20、technical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the me

21、mber bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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 identif

22、ying any or all such patent rights. ISO 12213-3 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of natural gas. This second edition cancels and replaces the first edition (ISO 12213-3:1997), which has been technically revised. The revision includes changes to

23、 Subclause 4.4.1 and the addition of a new annex, Annex E. ISO 12213 consists of the following parts, under the general title Natural gas Calculation of compression factor: Part 1: Introduction and guidelines Part 2: Calculation using molar-composition analysis Part 3: Calculation using physical pro

24、perties BS EN ISO 12213-3:2009INTERNATIONAL STANDARD ISO 12213-3:2006(E) ISO 2006 All rights reserved 1Natural gas Calculation of compression factor Part 3: Calculation using physical properties 1 Scope ISO 12213 specifies methods for the calculation of compression factors of natural gases, natural

25、gases containing a synthetic admixture and similar mixtures at conditions under which the mixture can exist only as a gas. This part of ISO 12213 specifies a method for the calculation of compression factors when the superior calorific value, relative density and carbon dioxide content are known, to

26、gether with the relevant pressures and temperatures. If hydrogen is present, as is often the case for gases with a synthetic admixture, the hydrogen content also needs to be known. NOTE In principle, it is possible to calculate the compression factor when any three of the parameters superior calorif

27、ic value, relative density, carbon dioxide content (the usual three) and nitrogen content are known, but subsets including nitrogen content are not recommended. The method is primarily applicable to pipeline quality gases within the ranges of pressure p and temperature T at which transmission and di

28、stribution operations normally take place, with an uncertainty of about 0,1 %. For wider-ranging applications the uncertainty of the results increases (see Annex F). More detail concerning the scope and field of application of the method is given in ISO 12213-1. 2 Normative references The following

29、referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6976:1995, Natural gas Calculation of calorific values, den

30、sity, relative density and Wobbe index from composition ISO 12213-1, Natural gas Calculation of compression factor Part 1: Introduction and guidelines ISO 80000-4, Quantities and units Part 4: Mechanics ISO 80000-5, Quantities and units Part 5: Thermodynamics 3 Terms and definitions For the purposes

31、 of this document, the terms and definitions given in ISO 12213-1 apply. BS EN ISO 12213-3:2009ISO 12213-3:2006(E) 2 ISO 2006 All rights reserved4 Method of calculation 4.1 Principle The method recommended uses equations which are based on the concept that pipeline quality natural gas may be uniquel

32、y characterized for calculation of its volumetric properties by an appropriate and distinctive set of measurable physical properties. These characteristics, together with the pressure and temperature, are used as input data for the method. The method uses the following physical properties: superior

33、calorific value, relative density and carbon dioxide content. The method is particularly useful in the common situation where a complete molar composition is not available, but may also be preferred for its relative simplicity. For gases with a synthetic admixture, the hydrogen content needs to be k

34、nown. 4.2 The SGERG-88 equation The calculation method using physical properties is based on the standard GERG 88 (SGERG-88) virial equation for natural gases1, 2, 3. The standard GERG 88 virial equation is derived from the master GERG 88 (MGERG-88) virial equation, which is a method of calculation

35、based on a molar-composition analysis4. The SGERG-88 virial equation from which the compression factor Z is calculated may be written as 1ZBC =+ +2mm(1) where B and C are functions of the input data comprising the superior calorific value HS, the relative density d, the contents of both inert and co

36、mbustible non-hydrocarbon components of the gas mixture (CO2and H2) and the temperature T; mis the molar density given by ( )p ZRT =m(2) where Z = f1(p, T, HS, d, xCO2, xH2) (3) However, the SGERG-88 method treats the natural-gas mixture internally as a five-component mixture consisting of an equiva

37、lent hydrocarbon gas (with the same thermodynamic properties as the sum of the hydrocarbons present), nitrogen, carbon dioxide, hydrogen and carbon monoxide. To characterize the thermodynamic properties of the hydrocarbon gas adequately, the hydrocarbon heating value HCHis also needed. Therefore, th

38、e calculation of Z uses Z = f2(p, T, HCH, xCH, xN2, xCO2, xH2, xCO) (4) In order to be able to model coke oven gas mixtures, the mole fraction of carbon monoxide is taken to have a fixed relation to the hydrogen content. If hydrogen is not present (xH20,55 0,97 0,45dxx+22CO H(B.43)b) The intermediat

39、e calculated value for the mole fraction of nitrogen shall satisfy the following conditions: 0,01 0,5x uu2N(B.44) 0,5xx+ u22NCO(B.45) c) Furthermore, the internal consistency of the input data for the third iteration loop shall satisfy the condition: 0,55 0,4 0,97 0,45dxxx+ + 222NCOH(B.46)BS EN ISO

40、12213-3:2009ISO 12213-3:2006(E) ISO 2006 All rights reserved 21Annex C (normative) Example calculations The following example calculations shall be used for the validation of computer implementations of the SGERG-88 method not cited in Annex B. The calculations have been carried out using the valida

41、ted executable programme GERG-88.EXE, which incorporates the subroutine SGERG.FOR described in Annex B. Table C.1 Input data Gas 1 Gas 2 Gas 3 Gas 4 Gas 5 Gas 6 xCO20,006 0,005 0,015 0,016 0,076 0,011 xH20,000 0,000 0,000 0,095 0,000 0,000 d 0,581 0,609 0,650 0,599 0,686 0,644 HS(MJm3) 40,66 40,62 4

42、3,53 34,16 36,64 36,58 Table C.2 Results (Z-values) Conditions Gas 1 Gas 2 Gas 3 Gas 4 Gas 5 Gas 6 p bar t C 60 3,15 0,840 84 0,833 97 0,794 15 0,885 69 0,826 64 0,854 06 60 6,85 0,862 02 0,856 15 0,822 10 0,901 50 0,850 17 0,873 88 60 16,85 0,880 07 0,875 00 0,845 53 0,915 07 0,870 03 0,890 71 60 3

43、6,85 0,908 81 0,904 91 0,882 23 0,936 84 0,901 24 0,917 36 60 56,85 0,929 96 0,926 90 0,908 93 0,953 02 0,923 94 0,936 90 120 3,15 0,721 46 0,711 40 0,643 22 0,808 43 0,695 57 0,749 39 120 6,85 0,759 69 0,750 79 0,690 62 0,836 13 0,738 28 0,784 73 120 16,85 0,792 57 0,784 72 0,731 96 0,859 99 0,774

44、63 0,814 90 120 36,85 0,844 92 0,838 77 0,797 78 0,898 27 0,831 66 0,862 66 120 56,85 0,883 22 0,878 32 0,845 54 0,926 62 0,872 69 0,897 49 These gases are the same as the six gases in ISO 12213-2:2006, Annex C, where the complete molar compositions are given. BS EN ISO 12213-3:2009ISO 12213-3:2006(

45、E) 22 ISO 2006 All rights reservedAnnex D (normative) Conversion factors D.1 Reference conditions The reference conditions for which the standard GERG 88 virial equation was developed and which the SGERG.FOR computer subroutine uses internally are Calorific value by combustion at T1= 298,15 K (t1= 2

46、5 C) p = 101,325 kPa gas metered at T2= 273,15 K (t2= 0 C) p = 101,325 kPa The latter set of conditions are also the reference conditions for relative density. Considerable care is needed to ensure that correctly referenced inputs are used for calorific value and relative density. Several countries

47、normally use the above conditions, but others use alternative conditions. This can easily cause confusion, particularly since the unit of calorific-value measurement in each case may still be MJm3. Table D.1 is a guide to which of the major international gas-trading countries use which reference con

48、ditions. For those using non-metric units for calorific value (i.e. Btuft3), conversion both of units and of reference conditions is required. The conversion factors used are taken from Reference 3. Table D.1 Nationally adopted metric reference conditions for the measurement of calorific value t1(C)

49、 t2(C) Australia Austria Belgium Canada Denmark France Germany Ireland Italy Japan Netherlands Russia United Kingdom United States of America 15 25 25 15 25 0 25 15 25 0 25 25 15 15 15 0 0 15 0 0 0 15 0 0 0 0 or 20 15 15 NOTE 1 In all countries the reference pressure is 101,325 kPa (= 1,013 25 bar). NOTE 2 t1is the combustion reference temperature. NOTE 3 t2is the gas-metering reference temperature. BS EN ISO 12213-3:2009ISO 12213-3:2006(E) ISO 2006 All rights reserved 23D.2 Units and