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Dansk standard
DS/EN 746-2
2. udgave
2010-06-01
Udstyr til industrielle termiske
procesanlæg – Del 2: Sikkerhedskrav
til fyrings- og brændstofsystemer
Industrial thermoprocessing equipment – Safety
requirements for combustion and fuel handling systems
COPYRIGHT Danish Standards. NOT FOR COMMERCIAL USE OR REPRODUCTION. DS/EN 746-2:2010
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DS-publikationstyper
Dansk Standard udgiver forskellige publikationstyper.
Typen på denne publikation fremgår af forsiden.
Der kan være tale om:
Dansk standard
• standard, der er udarbejdet på nationalt niveau, eller som er baseret på et andet lands nationale standard, eller
• standard, der er udarbejdet på internationalt og/eller europæisk niveau, og som har fået status som dansk standard
DS-information
• publikation, der er udarbejdet på nationalt niveau, og som ikke har opnået status som standard, eller
• publikation, der er udarbejdet på internationalt og/eller europæisk niveau, og som ikke har fået status som standard, fx en
teknisk rapport, eller
• europæisk præstandard
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Til disse publikationstyper kan endvidere udgives
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DS-publikationsform
Publikationstyperne udgives i forskellig form som henholdsvis
• fuldtekstpublikation (publikationen er trykt i sin helhed)
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• elektronisk (publikationen leveres på et elektronisk medie)
DS-betegnelse
Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr., fx DS 383, DS/EN 5414 osv. Hvis der efter nr.
er angivet et A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i
hovedstandarden.
DS-betegnelse angives på forsiden.
Overensstemmelse med anden publikation:
Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD
• IDT: Når publikationen er identisk med en given publikation.
• EQV: Når publikationen teknisk er i overensstemmelse med en given publikation, men
præsentationen er ændret.
• NEQ: Når publikationen teknisk eller præsentationsmæssigt ikke er i overensstemmelse med en
given standard, men udarbejdet på baggrund af denne.
• MOD: Når publikationen er modificeret i forhold til en given publikation.
DS/EN 746-2
København
DS projekt: M212672
ICS: 25.180.01
Første del af denne publikations betegnelse er:
DS/EN, hvilket betyder, at det er en europæisk standard, der har status som dansk standard.
Denne publikations overensstemmelse er:
IDT med: EN 746-2:2010.
DS-publikationen er på engelsk.
Denne publikation erstatter: DS/EN 746-2:1997.
COPYRIGHT Danish Standards. NOT FOR COMMERCIAL USE OR REPRODUCTION. DS/EN 746-2:2010
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EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
EN 746-2
May 2010
ICS 25.180.01 Supersedes EN 746-2:1997
English Version
Industrial thermoprocessing equipment - Safety requirements for
combustion and fuel handling systems
Equipements thermiques industriels - Partie 2:
Prescriptions de sécurité concernant la combustion et la
manutention des combustibles
Industrielle Thermoprozessanlagen - Teil 2:
Sicherheitsanforderungen an Feuerungen und
Brennstoffführungssysteme
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-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
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, Croatia, Cyprus, Czech Republic, 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 United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management 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: E
COPYRIGHT Danish Standards. NOT FOR COMMERCIAL USE OR REPRODUCTION. DS/EN 746-2:2010
EN 746-2:2010 (E)
2
Contents Page
Foreword ..............................................................................................................................................................6
Introduction .........................................................................................................................................................7
1 Scope ......................................................................................................................................................8
2 Normative references ............................................................................................................................9
3 Terms and definitions ........................................................................................................................ 11
4 List of hazards ..................................................................................................................................... 20
5 Safety requirements, measures and verification means ................................................................ 21
5.1 General ................................................................................................................................................. 21
5.2 Gaseous fuels ..................................................................................................................................... 21
5.2.1 Gas pipework ...................................................................................................................................... 21
5.2.2 Required safety devices ..................................................................................................................... 24
5.2.3 Combustion air and pre-purging the combustion chamber and flue passages .......................... 30
5.2.4 Supply of pre-mixed fuel gas/air ....................................................................................................... 32
5.2.5 Burners ................................................................................................................................................ 33
5.2.6 Automatic burner control systems ................................................................................................... 37
5.3 Liquid fuels .......................................................................................................................................... 39
5.3.1 Liquid fuel pipework ........................................................................................................................... 39
5.3.2 Required safety devices ..................................................................................................................... 42
5.3.3 Combustion air and pre-purging the combustion chamber and the flue passages .................... 45
5.3.4 Liquid fuel atomisation ...................................................................................................................... 47
5.3.5 Burners ................................................................................................................................................ 47
5.3.6 Automatic burner control systems ................................................................................................... 49
5.4 Solid fuels ............................................................................................................................................ 51
5.4.1 Pulverised solid fuel pipework .......................................................................................................... 51
5.4.2 Graded fuel pipework (applicable to grate burners and fluidised beds) ...................................... 52
5.4.3 Required devices (for pulverised fuels and fluidised beds) .......................................................... 53
5.4.4 Combustion air and pre-purging of the combustion chamber and flue passages ...................... 54
5.4.5 Burners ................................................................................................................................................ 54
5.4.6 Automatic burner control systems (pulverised fuel) ...................................................................... 56
5.5 Multiple fuels ....................................................................................................................................... 56
5.5.1 General ................................................................................................................................................. 56
5.5.2 Fuel circuit ........................................................................................................................................... 57
5.5.3 Combustion air supplies .................................................................................................................... 57
5.5.4 Operation of the safety devices ........................................................................................................ 57
5.5.5 Air/fuel ratio ......................................................................................................................................... 57
5.6 Oxygen or oxygen-enriched combustion air ................................................................................... 57
5.6.1 General ................................................................................................................................................. 57
5.6.2 Suitability for oxygen service ............................................................................................................ 57
5.6.3 Sealing materials for oxygen pipework ............................................................................................ 57
5.6.4 Pipework .............................................................................................................................................. 58
5.6.5 Pipes velocities ................................................................................................................................... 58
5.6.6 Fittings ................................................................................................................................................. 58
5.6.7 Blow off and venting lines ................................................................................................................. 58
5.6.8 Manual torches .................................................................................................................................... 58
5.6.9 Safety devices against gas backflow................................................................................................ 59
5.6.10 Safety devices against oxygen backflow in mixture with other substances ............................... 59
5.6.11 Material requirements ........................................................................................................................ 59
5.7 Design requirements for electrical and electronic equipment for control system and
protective system ............................................................................................................................... 59
5.7.1 General ................................................................................................................................................. 59
COPYRIGHT Danish Standards. NOT FOR COMMERCIAL USE OR REPRODUCTION. DS/EN 746-2:2010
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EN 746-2:2010 (E)
3
5.7.2 Requirements for protective systems ............................................................................................... 60
5.7.3 Fault assessment for a hardwired protective system ..................................................................... 64
5.7.4 Electrical power failure ....................................................................................................................... 70
5.7.5 Reset ..................................................................................................................................................... 70
6 Verification of the safety requirements and/or measures ............................................................... 72
7 Information for Use ............................................................................................................................. 77
7.1 General ................................................................................................................................................. 77
7.2 Marking ................................................................................................................................................. 77
7.3 Instruction handbook .......................................................................................................................... 78
7.3.1 General ................................................................................................................................................. 78
7.3.2 Description of equipment ................................................................................................................... 78
7.3.3 Inspection procedures ........................................................................................................................ 79
7.3.4 Commissioning, start-up and operating procedures ...................................................................... 79
7.3.5 Shut-down procedures ....................................................................................................................... 80
7.3.6 Maintenance procedures .................................................................................................................... 80
7.3.7 Documentation .................................................................................................................................... 80
Annex A (informative) Typical Examples of IThE, Fuels and Burners ........................................................ 81
A.1 List – Machines concerned, descriptions, functions ....................................................................... 81
A.1.1 List of IThE ........................................................................................................................................... 81
A.2 Classification of fuels ......................................................................................................................... 84
A.2.1 Gaseous fuels ...................................................................................................................................... 84
A.2.2 Liquid fuels .......................................................................................................................................... 84
A.2.3 Solid fuels ............................................................................................................................................ 84
A.3 Classification of burners .................................................................................................................... 85
A.3.1 Gaseous fuels ...................................................................................................................................... 85
A.3.2 Liquid fuels .......................................................................................................................................... 85
A.3.3 Solid fuels ............................................................................................................................................ 85
Annex B (informative) Technical terms .......................................................................................................... 86
Annex C (informative) Typical examples of piping and components ........................................................ 101
Annex D (informative) Methods for burner start-up .................................................................................... 111
Annex E (normative) Maximum allowable pressure .................................................................................... 118
Annex ZA (informative) .................................................................................................................................... 123
Bibliography .................................................................................................................................................... 124
COPYRIGHT Danish Standards. NOT FOR COMMERCIAL USE OR REPRODUCTION. DS/EN 746-2:2010
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