IEC-TR-62140-1-2002.pdf
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1、TECHNICAL REPORT IEC TR 62140-1 First edition 2002-10 Fossil-fired steam power stations Part 1: Limiting controls Centrales vapeur consommant des combustibles fossiles Partie 1: Rgulations de limitation Reference number IEC/TR 62140-1:2002(E) Copyright International Electrotechnical Commission Provi
2、ded by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 07:02:46 MSTNo reproduction or networking permitted without license from IHS -,-,- Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 6
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9、onal Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 07:02:46 MSTNo reproduction or networking permitted without license from IHS -,-,- TECHNICAL REPORT IEC TR 62140-1 First edition 2002-10 Fossil-fired
10、 steam power stations Part 1: Limiting controls Centrales vapeur consommant des combustibles fossiles Partie 1: Rgulations de limitation PRICE CODE IEC 2002 Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical
11、, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch U For price, se
12、e current catalogue Commission Electrotechnique Internationale International Electrotechnical Commission Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 07:02:46 MSTNo reproducti
13、on or networking permitted without license from IHS -,-,- 2 TR 62140-1 IEC:2002(E) CONTENTS FOREWORD 5 INTRODUCTION 7 1Scope 8 2Terms, subscripts and abbreviations 8 2.1Notations 8 2.2Subscripts 9 2.3Abbreviations (also used as subscripts) 9 3Function of limiting controls 10 3.1Values to be limited
14、.11 3.2Functional modules for limiting 11 4List of limiting controls 11 Annex A Upper limiting of steam pressure of steam generators.16 A.1Task.16 A.2Description of the control structure.17 A.3Operating behaviour.18 A.4Supplementary information.19 Annex B Lower limiting of steam pressure of steam ge
15、nerators.20 B.1 Task .20 B.2 Description of the control structure .21 B.3 Operating behaviour .22 B.4 Supplementary information .22 Annex C Limiting control of thermal stresses in pressure-bearing components23 C.1Task.23 C.2Description of the control structure.23 C.3Operating behaviour.26 Annex D Lo
16、wer limiting of evaporator flow for once-through boilers.27 D.1Task.27 D.2Description of the control structure.27 D.3Operating behaviour.32 Annex E Limiting controls on the feed-water function group.36 E.1Task.36 E.2Description of the control structure.39 E.3Operating behaviour.40 E.4Further control
17、 structures.44 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 07:02:46 MSTNo reproduction or networking permitted without license from IHS -,-,- TR 62140-1 IEC:2002(E) 3 Annex F
18、 Lower limiting of furnace thermal output, using as an example direct-firing pulverized coal furnace .46 F.1Task.46 F.2Description of the control structure.49 F.3Operating behaviour.49 Annex G Permissible turbine thermal stresses .51 G.1Task.51 G.2Description of the control systems51 G.3Operating be
19、haviour.53 G.4 Supplementary information .53 Index.54 Figure 1 Change in a controlled variable over time.10 Figure A.1 Plant circuit diagram for upper steam pressure limiting control using bypass devices .16 Figure A.2 Pressure characteristics of a conventional power station unit, shown for modified
20、 sliding pressure 17 Figure A.3 Function plan of master control of a steam bypass device for conventional power stations 18 Figure B.1 Plant circuit diagram for lower steam pressure limiting control 20 Figure B.2 Pressure characteristics of a conventional power station unit, shown for modified slidi
21、ng pressure 21 Figure B.3 Function plan of master control of a high-pressure minimum pressure control for conventional power stations .22 Figure C.1 Data logging, calculation, display; documentation of a limiting control.24 Figure C.2 Set-point guidance of steam temperature25 Figure D.1 Start-up sys
22、tem for start-up low power operation 28 Figure D.2 Feed-water control with circulating pump in main flow (Table D.1 b) 29 Figure D.3 Feed-water control with circulating pump in bypass flow (Table D.1 c) .30 Figure D.4 Feed-water control with circulating via feed-water pump (Table D.1 d).31 Figure D.
23、5 Limiting of evaporator flow during load increase33 Figure D.6 Limiting of evaporator flow during shut-down 34 Figure E.1 Plant overview of feed-water function group38 Figure E.2 Feed-water pump characteristics with limit curves.39 Figure E.3 Simplified function plan of a feed-water control with li
24、miting and structure shift.42 Figure E.4 General plan of feed-water control with speed-controlled E-pump and low power control valve .43 Figure F.1 Plant connection diagram of a milling unit 47 Figure F.2 General plan of limiting control of minimum furnace thermal power .48 Figure F.3 Example of sta
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