1、BRITISH STANDARD Water-tube boilers and auxiliary installations Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler The European Standard EN 12952-8:2002 has the status of a British Standard ICs 27.040 BS EN 12952-812002 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PER
2、MITTED BY COPYRIGHT LAW BS EN 12952-812002 National foreword This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 13 June 2002 This British Standard
3、 is the official English language version of When the reference to this European Standard has been published in the Official Journal of the European Communities (OJ), compliance with it will confer a presumption ofconformity with the essential requirements covered by the standard in respect of the P
4、ressure Equipment Directive. The UKparticipation in its preparation was entrusted toTechnica1 Committee PVE/2, Water-tube boilers, which has the responsibility to: EN 12952-812002. - - aid enquirers to understand the text; present to the responsible international/European committee any enquiries on
5、the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British St
6、andards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled ?International Standards Correspondence Index?, or by using the ?Search?faci1ity ofthe BSI Electronic Catalogue or ofBritish Stan dards Online. Thi
7、s publication does not purport to include all the necessary provisions of a contract. Users of this publication are responsible for their correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a front
8、 cover, an inside front cover, the EN title page, pages 2 to 26, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd.No. I Date I Comments O BSI 13 June 2002 ISBN O 580 39860 9 E
9、UROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12952-8 May 2002 ICs 27.040 English version Water-tube boilers and auxiliary installations - Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler Chaudires tubes deau et installations auxiliaires - Partie 8: Exigences
10、 pour les quipements de chauffe pour combustibles gazeux et liquides de la chaudire Wasserrohrkessel und Anlagenkomponenten - Teil 8: Anforderungen an Feuerungsanlagen fr flssige und gasfrmige fr den Kessel This European Standard was approved by CEN on 15 May 2002. CEN members are bound to comply wi
11、th the CENKENELEC 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 Management Centre
12、 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 Management Centre has the same status as the official vers
13、ions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPIS
14、CHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12952-8:2002 E EN 12952-812002 (E) Contents Page Foreword 3 1 1 .
15、1 1.2 1.3 2 3 4 4.1 4.2 4.3 4.4 5 5.1 5.2 5.3 6 6.1 6.2 6.3 6.4 6.5 6.6 7 8 8.1 8.2 Scope 5 Firing systems 5 Operation 5 Normative references 5 Terms and definitions 6 Fuel supply . General 10 Fuel transfer and preparation . Fuel lines . 10 Safety shut-off devices (Safety trip valves) . 12 Equipment
16、 for air supply and flue gas discharge 13 Air supply 13 Flue gas discharge 14 Firing system 15 Burners . 15 Flue gas recirculation 15 Control and monitoring . 16 Fuels 5 Airlfuel ratio 14 Electrical equipment 17 Safety precautions . 17 Common stack for several firing systems 18 Operating manual 18 M
17、ain firing systems . 18 Ignition burner systems 19 Particular requirements for firing systems burning gaseous fuels with high relative density 18 Annex A (normative) Chemical recovery boiler (black liquor boiler) . 20 A.l General 20 A.2 A.3 Special requirements for oil- or gas firing for chemical re
18、covery boilers . 21 Additional requirements for the firing system for black liquor in the chemical recovery boiler 20 Annex B (informative) Operational requirements for permanent supervised firing systems for liquid and gaseous fuels 22 B.l General 22 B.2 Operation 22 B.4 B.5 Airlfuel ratio 22 B.6 M
19、odification of firing, burner or airlfuel ratio setting . 22 B.7 B.8 B.9 Emergency operation 23 B.10 Operating and maintenance instructions 23 B.ll Firing systems burning gaseous fuels with high relative density 23 Annex ZA (informative) Clauses of this European Standard addressing essential safety
20、requirements Bibliography 26 B.3 Fuel preparation . 22 Safety shutoff devices . 22 Control and monitoring . 23 Purging, start-up and shut down . 23 or other provisions of the Pressure Equipment Directives . 25 2 EN 12952-812002 (E) Foreword This document (EN 12952-8:2002) has been prepared by Techni
21、cal Committee CEN/TC 269 ”Shell and water-tube boilers”, the secretariat of which is held by DIN. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For rela
22、tionship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard. 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 2002, and conflicting national standar
23、ds shall be withdrawn at the latest by November 2002. The European Standard EN 12952 concerning “ Water-tube boilers and auxiliary installations” consists of the following Parts: - Part I: General. - Part 2: Materials for pressure parts of boilers and accessories. - Part 3: Design and calculation fo
24、r pressure parts. - Part 4: In-service boiler life expectancy calculations. - Part 5: Workmanship and construction of pressure parts of the boiler. - Part 6: Inspection during construction, documentation and marking of pressure parts of the boiler. - Part 7: Requirements for equipment for the boiler
25、 - Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler. - Part 9: Requirements for firing systems for pulverized solid fuels for the boiler. - Part I O: Requirements for safeguards against excessive pressure. - Part I I: Requirements for limiting devices of the boiler
26、 and accessories. - Part 12: Requirements for boiler feedwater and boiler water quality. - Part 13: Requirements for flue gas cleaning systems. - Part 14: Requirements for flue gas DENOX-systems. - Part 15: Acceptance tests. - Part 16: Requirements for grate and fluidised bed firing systems for soli
27、d fuels for the boiler. CR 12952 Part 17: Guideline for the involvement of an inspection body independent of the manufacturer Although, these Parts can be obtained separately, it should be recognized that the Parts are interdependent. As such, the design and manufacture of water-tube boilers require
28、s the application of more than one Part in order for the requirements of the standard to be satisfactorily fulfilled. 3 EN 12952-812002 (E) NOTE Parts 4 and 15 are not applicable during the design, construction and installation stages. Annex A of this European Standard is normative and Annex B is in
29、formative. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherl
30、ands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 4 EN 12952-812002 (E) 1 Scope 1 .I Firing systems This Part of this European Standard specifies requirements, for oil and gas firing systems of steam boilers and hot water generators as defined in EN 12952-1. These requiremen
31、ts also apply to firing systems of chemical recovery boilers (black liquor boilers) with the additions and amendments specified in Annex A of this standard. NOTE 1 EN 12953-7 apply for single burner installations. This standard is not applicable to coil type boilers (flash boilers/small boilers) tha
32、t use burners in accordance with 1.2 NOTE 2 stations of long-distance gas pipelines. Fuels This standard is not applicable to the storage of liquid fuels and to transfer This Part of this European Standard specifies requirements, which cover the use of liquid and gaseous fuels as defined in this sta
33、ndard. Fuels deviating from standardized commercially available types may require additional or alternative safety measures. For black liquor these safety measures are given in Annex A. 1.3 Operation This Part of this European Standard specifies requirements for operational equipment in clauses 4 to
34、 8 which apply to steam boilers and hot water generators with permanent supervision by properly trained personnel familiar with the special conditions of the firing system and the type of fuel being fired. 2 Normative references This European Standard incorporates by dated or undated reference, prov
35、isions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it
36、by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 161, Automatic shut-off valves for gas burners and gas appliances. EN 264, Safety shut-off devices for combustion plants using liquid fuels - Safety requirements and
37、testing. EN 287-1, Approval testing of welders - Fusion welding - Part I: Steels. EN 751-1, Sealing materials for metallic threaded joints in contact with Ist, 2nd and 3rd family gases and hot water - Part I: Anaerobic jointing compounds. EN 751-2, Sealing materials for metallic threaded joints in c
38、ontact with Ist, 2nd and 3rd family gases and hot water - Part 2: Non-hardening jointing compounds. EN 751-3, Sealing materials for metallic threaded joints in contact with Ist, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes. EN 1044, Brazing - Filler metals. EN 12952-1, Wate
39、r-tube boilers and auxiliary installations - Part I: General. EN 12952-5:2001, Water-tube boilers and auxiliary installations - Part 5: Workmanship and construction of pressure parts of the boiler. EN 13480-2, Metallic industrial piping - Part 2: Materials. 5 EN 12952-812002 (E) prEN 501 56-1, Elect
40、rical equipment for furnaces and ancillary equipment - Part I: Requirements for application design and installation. EN IS0 3677, Filler metal for soft soldering, brazing and braze welding - Designation (IS0 3677: 1992). IS0 7-1, Pipe threads where pressure-tight joints are made on the threads - Par
41、t I: Dimensions, tolerances and designation. (IS0 7- I: 1994) IS0 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part I: Dimensions, tolerances and designation (IS0 228- 1:2000). 3 Terms and definitions For the purposes of this Part of this European Standard and the fo
42、llowing terms and definitions apply. 3.1 black liquor spent liquor from the pulp cook 3.2 black liquor gun device for the introduction of the black liquor as a spray of droplets into the furnace. The black liquor gun is not a burner 3.3 high volume low concentration odorous gas mixtures of air and a
43、 low concentration of odorous gases collected from the pulp mill processes, where the concentration of the combustible odorous gas is always kept below the lower explosion limit 3.4 burners devices (including main or igniter burners) for the introduction of fuel and air into a combustion chamber at
44、required velocities, turbulence and local fuel concentration to establish and maintain proper ignition and stable combustion of the fuel. Burners are differentiated by their mode of operation 3.4.1 automatic burners burners equipped with automatic ignition, flame monitoring and safety control device
45、s that control the firing rate without the intervention by operating personnel 3.4.2 semi-automatic burners burners equipped with automatic ignition, flame monitoring and safety control devices which are started and stopped by the intervention of operating personnel 3.4.3 chemical recovery boiler st
46、art up burner oil- or gasfired burner mainly intended for the initiation of the black liquor combustion process. The chemical recovery boiler start up burners are located in and integrated with a combustion air register, like the primary or the secondary air register of the furnace. Thus they have n
47、o individual air supply and no individual combustion air con tro I 3.4.4 multi-fuel burners burners in which more than one fuel is burned either simultaneously or alternately 3.4.5 pilot burner burner which maintains a proper permanent ignition source for one or a group of other non-monitored burner
48、s 6 EN 12952-812002 (E) 3.5 burner group burners operated in unison and controlled jointly. One of the burners can be a master burner 3.6 burner management system system that performs a predetermined sequence of actions and always operates in conjunction with a flame monitor that reacts to signals f
49、rom control and safety devices, gives control commands, controls the start-up sequence, supervises the burner operation, and manages controlled shutdown and lockout 3.7 firing system total equipment required for the combustion of fuels including the installations for the storage, preparation, and supply of fuels, the combustion air supply, the burner(s), the flue gas discharge, and all related control and monitoring devices. A flue gas recirculation system can be an integral part of the firing system 3.8 firing system heat input heat input into the combustion chamber according
