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1、J IS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Automated measuring systems for sulfur dioxide in flue gas using non-extractive methods ICs 13.040.40; 71.040.40 Reference number : JIS B 7991 : 2002 (E) FROTE CTED BY COPYRIGHT 7s Copyright Japanese Standar
2、ds Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,- B 7991 : 2002 Foreword This translation has been made based on the original Japanese
3、 Industrial Standard established by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. This establishment has been made based on IS0 7935 : 1992 Stationary source emissions-Determinat
4、ion of the mass concentration of sulfur dioxide-Performance characteristics of automated measuring methods in order to facilitate the comparison between Japanese Industrial Standard and the corresponding International Standard, the development of Japanese Industrial Standard conforming with Internat
5、ional Standard and the proposal of Draft International Standard based on Japanese Industrial Standard. Date of Establishment: 2002-04-20 Date of Public Notice in Official Gazette: 2002-04-22 Investigated by: Japanese Industrial Standards Committee Divisional Council on Environment JIS B 7991 :2002,
6、First English edition published in 2003-09 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 2003 All rights reserved. Unless otherw
7、ise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Pro
8、vided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,- B 7991 : 2002 Contents Page Introduction . Scope Normative reference Principle Composition Performance
9、 of measuring system . Marking . Instruction manual Annex 1 (informative) Comparison table between JIS and corresponding International Standard . (i PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Ber
10、nie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 7991 : 2002 Automated measuring systems for sulfur dioxide in flue gas using non-extractive methods Introduction This Japanese Industrial Standard has
11、been prepared based on 4.3 Non-extractive methods of IS0 7935 Stationary source emissions-Determination of the mass concentration of sulfur dioxide-Performance characteristics of automated measuring methods published in 1992 as the first edition and the items (2.6 and clause 7) which are not specifi
12、ed in the corresponding International Standard are added. In addition, the portions with dotted underlines or continuous sidelines are the matters which are not specified in the corresponding International Standard. 1 Scope This Standard specifies automated measuring systems and their mea- suring in
13、struments for the continuous measurement of the concentration of sulfur dioxide in flue gas using non-extractive methods. Remarks : The International Standard corresponding to this Standard is as fol- lows: In addition, symbols which denote the degree of correspondence in the contents between the re
14、levant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) ac- cording to ISODEC Guide 21. IS0 7935 : 1992 Stationary source emissions-Determination of the mass concentration of sulfur dioxide-Performance characteristics of automated measuring methods (MOD) 2
15、 Normative reference The standard given in the following contains provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standard (including amendments) shall be applied. JIS B 7981 Automated measuring systems and analyzers for s
16、ulfur dioxide in flue gas Remarks : IS0 7935 Stationary source emissions-Determination of the mass con- centration of sulfur dioxide-Performance characteristics of automated measuring methods is equivalent to the said standard. _._._._. 3 Principle This is a method without sampling gas, and the type
17、 of a method which transmits infrared rays or ultraviolet rays directly through flue gas that is called a path monitor type gas analyzer. The optical absorption of the light source when it was transmitted through flue gas is measured. In principle, it is the same as the infraredhltraviolet gas analy
18、zer of single beam type. Since the measured value is a concentration that includes gas contained moisture, it is necessary to measure the moisture content independently and to correct. Furthermore, an interference _ PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS unde
19、r license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 B 7991 : 2002 Information : Since this type does not have a sampling unit, it features that there is less time wasted
20、 and shorter time to respond, but since an installation site is limited to the wall surface of the duct of combustion gas, it is necessary to consider the following. Temperature Since in many cases the installation site is high in temperature circumstances, care shall be taken so that the light acce
21、ptance unit is able to be cooled sufficiently. Vibration Since it is an optical equipment, it shall be in- stalled with enough consideration so that the light source unit and light acceptance unit may not vibrate. Calibration Since it is almost impossible to calibrate by actually running a standard
22、gas, it is necessary to examine whether the reliability of measured values is assured or not. Maintenance The installation site shall be carefully Cho- sen so that the maintenance of equipment can be performed. Air The purge by clean air shall be performed on the light source unit and light acceptan
23、ce unit in order to prevent con- taminated with dust. Since the air supply for this operation is of a comparatively large amount, and also continuous, suf- ficient air supply source shall be assured beforehand. 4 Composition The measuring system shall be equipped with the light source unit, light ac
24、ceptance unit, etc. as shown in Fig. 1. There is also such a type that the light source unit and the light acceptance unit are installed on the same side, and light is reflected by a mirror such as a cube corner reflector. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by I
25、HS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 B 7991 : 2002 T Flue gas Purge air Purge air Fig. 1 Example of composition of non-extractive method 5 Performa
26、nce of measuring system The performance specified in Annex 3 (nor- mative) of JIS B 7981 shall be confirmed according to the method specified in clause 3 in Annex 4 (normative) of JIS B 7981 at the site installed as necessary. 6 Marking The measuring instrument shall be marked with the following inf
27、or- mation on conspicuous places by an indelible method. a) b) Components to be measured c) Concentration range for measurement d) Working temperature range e) f) Manufacturers name or abbreviation g) Year and month of manufacture h) Serial number Remarks : These information may not necessarily be m
28、arked in one place. Name and type name specified by the manufacturer Type of electric power source and capacity 7 Instruction manual items. a) Site for installation b) The instruction manual shall bear at least the following Allowable ranges of temperature, flow rate, dust concentration, and interfe
29、ring substances of sample gas c) Piping and wiring PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license
30、 from IHS -,-,- 4 B 7991 : 2002 Time for warming up Method of use 1) 2) Measuring procedures 3) Maintenance and checks 1) Guide for routine checking 2) Guide for periodical checking 3) Cleaning of flow channel 4) Preparation of measurement and calibration Dealing when measurement is stopped Counterm
31、easures to be taken at the time of troubles PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from I
32、HS -,-,- 5 B 7991 : 2002 cd a Q w Cu Q) 2 u? cc r ? m O Y c-3 O O Cu Pl m m b a % U d 3 o V ci 8 a ci u U o) a O 3 rl ril 00 A E PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale,
33、03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,- 6 B 7991 : 2002 a , a 3 .i z p: .ri m vi .3 .- & .i vi a o u * vi .i PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001,
34、User=Wing, Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,- 7 B 7991 : 2002 3 u . 3 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing,
35、Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,- Errata for J I S (English edition) are printed in Standardizurion Journal, published monthly by the Japanese Standards Association, and also provided to subscribers of JIS (English ed
36、ition) in Monthly Infonnation. Errata will be provided upon request, please contact: Standardization Promotion Department, Japanese Standards Association 4- 1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN TEL. 03-3583-8002 FAX. 03-3583-0462 100% Recycled pqper PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:09:26 MDTNo reproduction or networking permitted without license from IHS -,-,-