1、February 2011 Translation by DIN-Sprachendienst.English price group 33No 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).I
2、CS 25.180.01!$my0“1748613www.din.deDDIN EN 746-2Industrial thermoprocessing equipment Part 2: Safety requirements for combustion and fuel handling systemsEnglish translation of DIN EN 746-2:2011-02Industrielle Thermoprozessanlagen Teil 2: Sicherheitsanforderungen an Feuerungen und Brennstofffhrungss
3、ystemeEnglische bersetzung von DIN EN 746-2:2011-02quipements thermiques industriels Partie 2: Prescriptions de scurit concernant la combustion et la manutention descombustiblesTraduction anglaise de DIN EN 746-2:2011-02SupersedesDIN EN 746-2:2010-10www.beuth.deDocument comprises pagesIn case of dou
4、bt, the German-language original shall be considered authoritative.12702.11 DIN EN 746-2:2011-02 A comma is used as the decimal marker. Start of application The start of application of this standard is 1 October 2010. National foreword This standard includes safety requirements. This standard has be
5、en prepared by Technical Committee CEN/TC 186 “Industrial thermoprocessing Safety” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Maschinenbau (Mechanical Engineering Standards Committee), Working Committee NA 060-03-02 AA Industrielle Th
6、ermoprozessanlagen Sicherheit of Section Thermoprozesstechnik. Representatives of manufacturers and users of thermoprocessing equipment, and of the employers liability insurance associations contributed to this standard. This standard contains specifications meeting the essential requirements set ou
7、t in Annex I of the new “Machinery Directive”, Directive 2006/42/EC, and which apply to machines that are either first placed on the market or commissioned within the EEA. This standard serves to facilitate proof of compliance with the essential requirements of the directives. Once this standard is
8、cited in the Official Journal of the European Union, it is deemed a “harmonized” standard and thus, a manufacturer applying this standard may assume compliance with the requirements of the Machinery Directive (“presumption of conformity”). The European Standards referred to in Clause 2 and in the Bi
9、bliography of the EN have been published as the corresponding DIN EN or DIN EN ISO Standards with the same number. For the International Standards referred to in this standard there are no national standards available unless they have been published as DIN ISO standards with the same number. Amendme
10、nts This standard differs from DIN EN 746-2:1997-05 as follows: a) Subclause 5.7 “Design requirements for electrical and electronic equipment for control system and protective system” has been included; b) Annex ZA (informative) “Relationship between this European Standard and the Essential Requirem
11、ents of EU Directive 2006/42/EC” has been included. Compared with DIN EN 746-2:2010-10, the following corrections have been made to the German version only and therefore do not affect the English text: a) in Subclause 5.2.2.3.3, last paragraph, the text following the first item: “ in case of high te
12、mperature equipment;” (im Falle von Hochtemperaturanlagen) has been deleted; b) some typing errors have been corrected. Previous editions DIN EN 746-2: 1997-05, 2010-10 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 746-2 May 2010 ICS 25.180.01 Supersedes EN 746-2:1997English Version Industr
13、ial thermoprocessing equipment - Safety requirements for combustion and fuel handling systems Equipements thermiques industriels - Partie 2: Prescriptions de scurit concernant la combustion et la manutention des combustibles Industrielle Thermoprozessanlagen - Teil 2: Sicherheitsanforderungen an Feu
14、erungen und Brennstofffhrungssysteme This European Standard was approved by CEN on 11 March 2010. 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 alteration. Up-to
15、-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 in any other language made by translation unde
16、r 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany,
17、 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 NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Man
18、agement Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 746-2:2010: EEN 746-2:2010 (E) 2 Contents Page Foreword 6Introduction .71 Scope 82 Normative references 93 Terms and definitions
19、 114 List of hazards . 205 Safety requirements, measures and verification means 215.1 General . 215.2 Gaseous fuels . 215.2.1 Gas pipework 215.2.2 Required safety devices . 245.2.3 Combustion air and pre-purging the combustion chamber and flue passages 305.2.4 Supply of pre-mixed fuel gas/air . 325.
20、2.5 Burners 335.2.6 Automatic burner control systems . 375.3 Liquid fuels 395.3.1 Liquid fuel pipework . 395.3.2 Required safety devices . 425.3.3 Combustion air and pre-purging the combustion chamber and the flue passages 455.3.4 Liquid fuel atomisation 475.3.5 Burners 475.3.6 Automatic burner cont
21、rol systems . 495.4 Solid fuels 515.4.1 Pulverised solid fuel pipework 515.4.2 Graded fuel pipework (applicable to grate burners and fluidised beds) 525.4.3 Required devices (for pulverised fuels and fluidised beds) 535.4.4 Combustion air and pre-purging of the combustion chamber and flue passages 5
22、45.4.5 Burners 545.4.6 Automatic burner control systems (pulverised fuel) 565.5 Multiple fuels . 565.5.1 General . 565.5.2 Fuel circuit . 575.5.3 Combustion air supplies 575.5.4 Operation of the safety devices 575.5.5 Air/fuel ratio . 575.6 Oxygen or oxygen-enriched combustion air . 575.6.1 General
23、. 575.6.2 Suitability for oxygen service 575.6.3 Sealing materials for oxygen pipework 575.6.4 Pipework 585.6.5 Pipes velocities . 585.6.6 Fittings . 585.6.7 Blow off and venting lines . 585.6.8 Manual torches 585.6.9 Safety devices against gas backflow 595.6.10 Safety devices against oxygen backflo
24、w in mixture with other substances . 595.6.11 Material requirements 595.7 Design requirements for electrical and electronic equipment for control system and protective system . 595.7.1 General . 59DIN EN 746-2:2011-02 EN 746-2:2010 (E) 3 5.7.2 Requirements for protective systems . 605.7.3 Fault asse
25、ssment for a hardwired protective system . 645.7.4 Electrical power failure . 705.7.5 Reset . 706 Verification of the safety requirements and/or measures . 727 Information for Use . 777.1 General . 777.2 Marking . 777.3 Instruction handbook 787.3.1 General . 787.3.2 Description of equipment . 787.3.
26、3 Inspection procedures 797.3.4 Commissioning, start-up and operating procedures 797.3.5 Shut-down procedures . 807.3.6 Maintenance procedures 807.3.7 Documentation 80Annex A (informative) Typical Examples of IThE, Fuels and Burners 81A.1 List Machines concerned, descriptions, functions . 81A.1.1 Li
27、st of IThE . 81A.2 Classification of fuels . 84A.2.1 Gaseous fuels 84A.2.2 Liquid fuels 84A.2.3 Solid fuels 84A.3 Classification of burners 85A.3.1 Gaseous fuels 85A.3.2 Liquid fuels 85A.3.3 Solid fuels 85Annex B (informative) Technical terms 86Annex C (informative) Typical examples of piping and co
28、mponents 101Annex D (informative) Methods for burner start-up 111Annex E (normative) Maximum allowable pressure 118Annex ZA (informative) 123Bibliography 124DIN EN 746-2:2011-02 EN 746-2:2010 (E) 4 Figures Figure 1 Block diagram of control/protective and heated system . 60Figure 2 a Example for requ
29、irements of 5.7.2 a . 61Figure 2 b Example for requirements of 5.7.2 b . 62Figure 2 c Example for requirements of 5.7.2 c . 63Figure 2 d Example for requirements of 5.7.2 d . 63Figure 3 Fault assessment for the hardwired section of a protective system . 65Figure 4 Consideration of fault tolerance ti
30、me and safety time for IThE 66Figure 5 Examples for wiring of fuel shut-down with hardware diversity of the disconnecting devices . 67Figure 6 Example for wiring of fuel shut-down with diverse functionality of the disconnecting devices . 68Figure C.1 Single burner equipment . 101Figure C.2a Multiple
31、 burner equipment Central pipework Example a two burners system 102Figure C.2b Multiple burner equipment Central pipework Example b. 103Figure C.2c Multiple burner equipment Central pipework Example c . 104Figure C.3a Multiple burner equipment Zone pipework Example a . 105Figure C.3b Multiple burner
32、 equipment Zone pipework Example b 106Figure C.3c Multiple burner equipment Zone pipework Example c . 107Figure C.4 Multiple burner equipment (burner pipework). 108Figure C.5 Central pipework for low cycling applications 109Figure C.6 Draft breaks . 110Figure D.1 Direct main burner ignition at full
33、rate (see Table 3, Column 2, QF max 120 kW) 111Figure D.2 Direct main burner ignition at reduced ratewith slow opening valve (see Table 3, Column 3, QF max 360 kW) 111Figures D.3 and D.4 Direct main burner ignition at reduced rate with by-pass start gas supply (see Table 3, Column 4) . 112Figures D.
34、5 and D.6 Direct main burner ignition at reduced rate with limited start gas input (see Table 3, Column 4) . 113Figures D.7 and D.8 Main burner ignition with independent pilot burner (see Table 3, Column 5, QF max 120 kW) . 114Figures D.9 and D.10 Main burner ignition with independent pilot burner (
35、see Table 3, Column 5, QF max 360 kW) . 115DIN EN 746-2:2011-02 EN 746-2:2010 (E) 5 Figures D.11 and D.12 Main burner ignition with independent pilot burner (see Table 3, Column 5). 116Figures D.13 and D.14 Main burner ignition with independent pilot burner (see Table 3, Column 5). 117Figure E.1 Pip
36、ing referred to clause a) group 1 of Annex E 119Figure E.2 Piping referred to clause a) group 2 of Annex E 120Figure E.3 Piping referred to clause b) group 1 of Annex E 121Figure E.4 Piping referred to clause b) group 2 of Annex E 122Tables Table 1 Maximum safety times for natural draught burners op
37、erating in open air 34Table 2 Maximum safety times for natural draught burners operating in combustion chamber 35Table 3 Maximum safety times for forced and induced draught burners 36Table 4 Maximum safety times . 48Table 5 Materials requirements 59Table 6 Verification of the safety requirements and
38、/or measures 72Table B.1 English German French . 86Table B.2 German English French . 91Table B.3 French English German . 96DIN EN 746-2:2011-02 EN 746-2:2010 (E) 6 Foreword This document (EN 746-2:2010) has been prepared by Technical Committee CEN/TC 186 “Industrial Thermoprocessing Equipment”, the
39、secretariat of which is held by DIN. 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 November 2010, and conflicting national standards shall be withdrawn at the latest by May 2011. Attention is dr
40、awn 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. This document supersedes EN 746-2:1997. This document has been prepared under a mandate given to CEN
41、by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. Following a request from CEN/TC 186, CEN has agreed to defer the da
42、te of withdrawal of EN 746-2:1997 for a transitional period of 12 months. 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, Den
43、mark, 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. DIN EN 746-2:2011-02 EN 746-2:2010 (E) 7 Introduction This E
44、uropean Standard is a Type C standard as defined in EN ISO 12100-1. The machinery concerned and the extent to which hazards, hazardous situations and events are covered, is indicated in the scope of this document. When provisions of this type C standard are different from those which are stated in t
45、ype A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard. This Part of EN 746 assumes that the equipment is not creating any potentially
46、explosive atmosphere and is located in a normally ventilated area. This European Standard forms one part of a series of safety standards covering Industrial Thermoprocessing Equipment (IThE). The full list of these standards is given below: EN 746, Industrial thermoprocessing equipment Part 1: Commo
47、n safety requirements for industrial thermoprocessing equipment Part 2: Safety requirements for combustion and fuel handling systems Part 3: Safety requirements for the generation and use of atmosphere gases Part 4: Particular safety requirements for hot dip galvanising thermoprocessing equipment Pa
48、rt 5: Particular safety requirements for salt bath thermoprocessing equipment Part 6: Particular safety requirements for material melting, re-melting and liquid phase maintaining thermoprocessing equipment Part 7: Particular safety requirements for vacuum thermoprocessing equipment Part 8: Particular safety requirements for quenching equipment Compliance with European product standards e.g. EN 267, EN 12952-8, EN 12953-7 or EN 676 is not sufficient to ensure the minimum safety requirement for indust
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