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1、TECHNICAL SPECIFICATION DRY ELECTROSTATIC PRECIPITATORS DEP 31.27.21.30-Gen. July 1998 (DEP Circular 18/99 has been incorporated) DESIGN AND ENGINEERING PRACTICE This document is confidential. Neither the whole nor any part of this document may be disclosed to any third party without the prior writt
2、en consent of Shell International Oil Products B.V. and Shell International Exploration and Production B.V., The Hague, The Netherlands. The copyright of this document is vested in these companies. All rights reserved. Neither the whole nor any part of this document may be reproduced, stored in any
3、retrieval system or transmitted in any form or by any means (electronic, mechanical, reprographic, recording or otherwise) without the prior written consent of the copyright owners. PREFACE DEP (Design and Engineering Practice) publications reflect the views, at the time of publication, of: Shell In
4、ternational Oil Products B.V. (SIOP) and Shell International Exploration and Production B.V. (SIEP) and Shell International Chemicals B.V. (SIC) The Hague, The Netherlands, and other Service Companies. They are based on the experience acquired during their involvement with the design, construction,
5、operation and maintenance of processing units and facilities, and they are supplemented with the experience of Group Operating companies. Where appropriate they are based on, or reference is made to, national and international standards and codes of practice. The objective is to set the recommended
6、standard for good design and engineering practice applied by Group companies operating an oil refinery, gas handling installation, chemical plant, oil and gas production facility, or any other such facility, and thereby to achieve maximum technical and economic benefit from standardization. The info
7、rmation set forth in these publications is provided to users for their consideration and decision to implement. This is of particular importance where DEPs may not cover every requirement or diversity of condition at each locality. The system of DEPs is expected to be sufficiently flexible to allow
8、individual operating companies to adapt the information set forth in DEPs to their own environment and requirements. When Contractors or Manufacturers/Suppliers use DEPs they shall be solely responsible for the quality of work and the attainment of the required design and engineering standards. In p
9、articular, for those requirements not specifically covered, the Principal will expect them to follow those design and engineering practices which will achieve the same level of integrity as reflected in the DEPs. If in doubt, the Contractor or Manufacturer/Supplier shall, without detracting from his
10、 own responsibility, consult the Principal or its technical advisor. The right to use DEPs is granted by SIOP, SIEP or SIC, in most cases under Service Agreements primarily with companies of the Royal Dutch/Shell Group and other companies receiving technical advice and services from SIOP, SIEP or SI
11、C. Consequently, three categories of users of DEPs can be distinguished: 1)Operating companies having a Service Agreement with SIOP, SIEP, SIC or other Service Company. The use of DEPs by these Operating companies is subject in all respects to the terms and conditions of the relevant Service Agreeme
12、nt. 2)Other parties who are authorized to use DEPs subject to appropriate contractual arrangements. 3)Contractors/subcontractors and Manufacturers/Suppliers under a contract with users referred to under 1) or 2) which requires that tenders for projects, materials supplied or - generally - work perfo
13、rmed on behalf of the said users comply with the relevant standards. Subject to any particular terms and conditions as may be set forth in specific agreements with users, SIOP, SIEP and SIC disclaim any liability of whatsoever nature for any damage (including injury or death) suffered by any company
14、 or person whomsoever as a result of or in connection with the use, application or implementation of any DEP, combination of DEPs or any part thereof. The benefit of this disclaimer shall inure in all respects to SIOP, SIEP, SIC and/or any company affiliated to these companies that may issue DEPs or
15、 require the use of DEPs. Without prejudice to any specific terms in respect of confidentiality under relevant contractual arrangements, DEPs shall not, without the prior written consent of SIOP and SIEP, be disclosed by users to any company or person whomsoever and the DEPs shall be used exclusivel
16、y for the purpose for which they have been provided to the user. They shall be returned after use, including any copies which shall only be made by users with the express prior written consent of SIOP and SIEP. The copyright of DEPs vests in SIOP and SIEP. Users shall arrange for DEPs to be held in
17、safe custody and SIOP or SIEP may at any time require information satisfactory to them in order to ascertain how users implement this requirement. All administrative queries should be directed to the DEP Administrator in SIOP. NOTE: In addition to DEP publications there are Standard Specifications a
18、nd Draft DEPs for Development (DDDs). DDDs generally introduce new procedures or techniques that will probably need updating as further experience develops during their use. The above requirements for distribution and use of DEPs are also applicable to Standard Specifications and DDDs. Standard Spec
19、ifications and DDDs will gradually be replaced by DEPs. DEP 31.27.21.30-Gen. July 1998 Page 2 TABLE OF CONTENTS 1.INTRODUCTION.5 1.1SCOPE 5 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS5 1.3SUMMARY OF MAIN CHANGES5 1.4DEFINITIONS 6 1.5CROSS-REFERENCES7 2.ESP DESCRIPTION8 2.1ESP FUNCTIO
20、NALITY8 2.2DUST DISPOSAL8 3.DESIGN AND ENGINEERING9 3.1GENERAL DESCRIPTION9 3.2ESP CASING, INCLUDING INLET AND OUTLET TRANSITIONS10 3.3GAS DISTRIBUTION DEVICES11 3.4ELECTRODE ASSEMBLIES.12 3.5ELECTRODE CLEANING MECHANISM13 3.6DUST HOPPERS AND DISCHARGE SYSTEM.14 3.7OBSERVATION AND ACCESS15 3.8SUPPOR
21、T STRUCTURE AND FOUNDATION16 3.9DESIGN OF DUCTING.17 3.10PIPING AND PIPING CONNECTIONS.19 3.11DAMPERS AND ISOLATORS.20 3.12STEEL STACKS22 3.13FANS. 23 3.14CHEMICAL DOSING INSTALLATION FOR FLUE GAS CONDITIONING.24 3.15GAS FLOW INDUCED VIBRATIONS.25 4.SURFACE PREPARATION,PAINTING AND COATING.26 5.INSU
22、LATION.27 6.ELECTRICAL INSTALLATIONS28 6.1GENERAL DESCRIPTION28 6.2MAINS ELECTRICITY SUPPLY28 6.3MAINS VOLTAGE DISTORTION28 6.4ELECTRICAL CONTROL CUBICLE.28 6.5TRANSFORMER RECTIFIER UNITS (T-R SETS).29 6.6HIGH VOLTAGE DISCHARGE SYSTEM.30 6.7ELECTRIC MOTORS31 6.8ANTI-CONDENSATION AND HEATING SYSTEMS3
23、1 6.9LIGHTING AND POWER INSTALLATION.31 6.10EARTHING SYSTEM31 7.INSTRUMENTATION AND CONTROL32 7.1GENERAL DESCRIPTION32 7.2INSTRUMENTATION32 7.3AUTOMATIC CONTROL UNIT.32 7.4INSTRUMENTED PROTECTIVE FUNCTION33 8.NOISE LIMITATIONS.34 8.1GENERAL DESCRIPTION34 8.2NOISE LIMITS.34 8.3NOISE ABATEMENT.34 8.4I
24、NFORMATION TO BE SUBMITTED WITH THE TENDER.34 9.ADDITIONAL REQUIREMENTS35 9.1NAMEPLATES AND RATING PLATES35 9.2SPECIAL TOOLS35 9.3MAINTENANCE MANUAL.35 9.4SPARE PARTS35 10.MATERIAL, FABRICATIONAND CONSTRUCTION 36 DEP 31.27.21.30-Gen. July 1998 Page 3 10.1GENERAL 36 10.2CONSTRUCTION MATERIALS36 10.3W
25、ELDING 36 10.4PIPING FABRICATION.36 10.5GASKETS AND PACKING36 11.PACKAGING,TRANSPORT AND SHIPPING37 12.INSPECTION AND TESTING.38 12.1INSPECTION AND TESTING OF MATERIALS AND EQUIPMENT.38 12.2SCOPE OF INSPECTION WORK.38 12.3REPORTING.38 13.ERECTION, START-UP AND PERFORMANCE TESTING.40 13.1MECHANICAL E
26、RECTION.40 13.2AIR LOAD TEST40 13.3START-UP. 41 13.4PERFORMANCE/ACCEPTANCE TESTING41 14.DOCUMENTATION.43 14.1GENERAL 43 14.2DATA/REQUISITION SHEETS AND DOCUMENTATION REQUIRED AT TENDERING 43 14.3DOCUMENTATION AND INFORMATIONS REQUIRED AFTER CONTRACT AWARD. 44 15.GUARANTEE46 16.REFERENCES47 APPENDICE
27、S APPENDIX 1SCOPE OF SUPPLY AND TERMINAL POINTS.50 APPENDIX 2TYPICAL RIGID FRAME ESP51 APPENDIX 3TYPICAL COLLECTING ELECTRODE DESIGN52 APPENDIX 4AIR LOAD TEST PROCEDURE53 APPENDIX 5TYPICAL DISCHARGE ELECTRODE SUPPORT54 APPENDIX 6TYPICAL HAMMER RAPPER SYSTEM55 APPENDIX 7TYPICAL ELECTROMAGNETIC IMPACT
28、 RAPPER SYSTEM.56 APPENDIX 8DANGER NOTICE.57 DEP 31.27.21.30-Gen. July 1998 Page 4 1.INTRODUCTION 1.1SCOPE This DEP specifies requirements and gives recommendations for the design, fabrication, assembly, erection, inspection, testing and commissioning of dry electrostatic precipitators (ESPs). This
29、DEP covers hot and cold ESPs of both horizontal and vertical construction. Wet collection ESPs are excluded from the scope of this DEP. This DEP is a revision of the DEP of the same number dated December 1992; a summary of the main changes is given in Section 1.3. The installation shall comprise the
30、 equipment listed on a sheet entitled Scope of Supply. The limits of supply shall be listed and defined on a sheet entitled Terminal points. For guidance, typical examples of a Scope of supply and Terminal points are given in Appendix 1. To facilitate exchange and assessment of information by the Pr
31、incipal and the Supplier, use shall be made of data/requisition sheets DEP 31.27.21.94-Gen.; the purpose of these sheets is described in Section 14. 1.2DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS Unless otherwise authorised by SIOP and SIEP, the distribution of this DEP is confined to c
32、ompanies forming part of the Royal Dutch/Shell Group or managed by a Group company, and to Contractors nominated by them (i.e. the distribution code is “C“, as defined in DEP 00.00.05.05-Gen.). This DEP is primarily intended for use in oil refineries but may also be used for applications in chemical
33、 plants, gas plants and exploration and production facilities. In the latter cases, redundancy aspects associated with a shutdown frequency of 3 to 4 years in refinery applications should be considered. If national and/or local regulations exist in which some of the requirements may be more stringen
34、t than in this DEP, the Contractor shall determine by careful scrutiny which of the requirements are the more stringent and which combination of requirements will be acceptable as regards safety, environmental, economic and legal aspects. In all cases the Contractor shall inform the Principal of any
35、 deviation from the requirements of this DEP which is considered to be necessary in order to comply with national and/or local regulations. The Principal may then negotiate with the Authorities concerned with the object of obtaining agreement to follow this DEP as closely as possible. 1.3SUMMARY OF
36、MAIN CHANGES A summary of the main changes since the last revision of this DEP are as follows: SectionDescription 1.1Distinction between hot-side and cold-side removed. Same in Section 2, description reworded. 2.Section on dust disposal added. 3.1Design not limited to rigid frame construction. 3.1Re
37、quirement for flow model study added. 3.3Section on gas distribution devices rewritten. 3.6.1Minimum plate thickness requirement removed for FCCU applications. 6.2Section replaced by reference to DEP 33.64.10.10-Gen. 6.3Section replaced by reference to DEP 33.64.10.10-Gen. 6.4Paragraph on control ci
38、rcuit protection removed 6.7Relevant standards added for motor protection in dusty atmospheres. DEP 31.27.21.30-Gen. July 1998 Page 5 6.9Section replaced by reference to DEP 33.64.10.10-Gen. 6.10Most of this section replaced by reference to DEP 33.64.10.10-Gen. 10.3Section on structural welding repl
39、aced by reference to DEP 34.28.00.31- Gen. 10.4Duplication with 3.10 removed 13.2New section for air load test 16References updated Appendix 4Air load test procedure included Appendix 8Danger notice updated 1.4DEFINITIONS 1.4.1General definitions The Contractor is the party which carries out all or
40、part of the design, engineering, procurement, construction, commissioning or management of a project or operation of a facility. The Principal may undertake all or part of the duties of the Contractor. The Manufacturer/Supplier is the party which manufactures or supplies equipment and services to pe
41、rform the duties specified by the Contractor. The Principal is the party which initiates the project and ultimately pays for its design and construction. The Principal will generally specify the technical requirements. The Principal may also include an agent or consultant authorised to act for, and
42、on behalf of, the Principal. The word shall indicates a requirement. The word should indicates a recommendation. 1.4.2Specific definitions and abbreviations aspect ratioratio of the total collecting plate length over height bus sectionESP portion that is independentlyenergized cellsbus sections arra
43、nged perpendicular to the gas flow chambergas-tight longitudinal subdivision of the ESP collecting electrodeparticulate collecting surface crest factorratio of the peak value to the rms value of the periodic wave form discharge electrodeemitting and corona-establishing surface efficiencyweightfracti
44、onofcollectedparticlesdividedbythetotal particulates entering the ESP, as a percentage electrodesboth the discharge and collecting electrodes ESPdry electrostatic precipitator FCCUfluidised catalytic cracking unit fieldsbus sections arranged in the direction of the gas flow. Each field is fully sepa
45、ratedbothelectrically andmechanically fromany adjacent field IPFinstrumented protective function. A function comprising the initiator function, logic solver function and final element function for the purpose of preventing or mitigating hazardous situations. See DEP 32.80.10.10-Gen. IPSinstrumented
46、protective system. The electromechanical, electronic DEP 31.27.21.30-Gen. July 1998 Page 6 and/or programmable electronic logic solver component of the instrumented protective function, complete with input and output equipment. T-R settransformer and rectifier unit velocity, face or gasaverage veloc
47、ity of the gas across the ESP 1.5CROSS-REFERENCES Where cross-references to other parts of this DEP are made, the referenced section number is shown in brackets. Other documents referenced in this DEP are listed in (16). DEP 31.27.21.30-Gen. July 1998 Page 7 2.ESP DESCRIPTION 2.1ESP FUNCTIONALITY ES
48、Ps are used to control air pollution (e.g. flue gas cleaning) by collecting solid particulates typicallyin the range of 10 m and smaller. ESPs are used for exhaust gas cleaning of boilers, incinerators and regenerators of catalytic cracking units. The electrostatic precipitation process can be eithe
49、r dry or wet. Dry collectors have certain advantages over wet collectors in that dry collection simplifies handling and saves costs of processing the particulates. Handling and disposal of the collected material shall be planned with account being taken of the need for cooling, ventilation or other precautions. Without cooling, the temperature limits of equipment will have to be considered and dry dusty material, if hygroscopic, may cause caking. Also, the precipitate may be pyrophoric. Depending on the nature of the particulate in question (e.g. a liquid residue), wet collection may
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