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  Oil Shale

ISSN 1736-7492 (electronic)  ISSN 0208-189X (print)
Published since 1984

Oil Shale

ISSN 1736-7492 (electronic)  ISSN 0208-189X (print)
Published since 1984

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VALIDITY OF AN EXPERT SYSTEM FOR OIL SHALE-FIRED CFB BOILER DESIGN AND PERFORMANCE ANALYSIS; pp. 400–411

(Full article in PDF format)   doi: 10.3176/oil.2008.4.02


Authors

WANG QING, BAI JINGRU, ZHAO LIXIA, SUN BAIZHONG, LIU HONGPENG

Abstract

A 65-t/h oil shale-fired circulating fluidized bed (CFB) boiler of low circula­tion ratio, the earliest prototype operated in the world, was manually designed by our research group twelve years ago using our experience and published data available. On the basis of the long-term operation, it has been demonstrated that all expected performances, such as high combustion efficiency, low emission of NOx and SOx, stability of operation and flexibility of load change etc., have been reached. For evaluation and confirmation of the manual design, an Expert System (CFBCAD) developed by Greenfield Research Inc. was used to regenerate the boiler. The results from these two approaches were compared and validated, and a reasonable agreement was reached. Finally, the main parameters of the prototype were provided. Some design principles were given and a series of hot operation tests were carried out. The influence of load on the boiler performances such as temperature in the bed and the back pass, and heat loss were assessed and discussed. The properties of self-desulphurization and boiler start-up were also described.



References

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2. Holopainen , H. Experience of oil shale combustion in Ahlstrom pyroflow CFB-boiler // Oil Shale. 1991. Vol. 8 , No. 3. P. 194–209.

3. Loosaar , J. , Arro , H. , Parve , T. , Pihu , T. , Prikk , A. , Tiikma , T. , Hiltunen , M. New 215 MWEL CFB power units for Estonian oil shale // Proceedings of the 18th International Conference on Fluidized Bed Combustion , Toronto , Ontario (Canada) , May 22–25 , 2005. ASME , New York , CD-ROM , ISBN 0-7918-3755-6. FBC2005-78141. 12 p. http://www.asmeconferences.org/FBC05/ TechnicalProgramOverview.cfm#1.

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5. Lafanechère , L. , Jestin , L. Study of a circulating fluidized bed furnace behavior in order to scale it up to 600 Mwe // Proceeding of the 13th International Conference on Fluidized Bed Combustion / K. J. Heinschel (ed.). New York: ASME , 1995. Vol. II. P. 971–980.

6. Lafanechère , L. , Basu , P. , Jestin , L. Use of an expert system to study the effect of steam parameters on the size and configuration of circulating fluidized bed boilers // Journal of Engineering for Gas Turbines and Power. 1998. Vol. 120 , No. 4. P. 861–866.
doi:10.1115/1.2818479

7. Basu , P. , Fraser , S. A. Circulating Fluidized Bed Boiler: Design and Operation. - Boston: Butterworth-Heinemann , 1991. P. 163–193.

8. Cen , K. F. Overall design of the circulating fluidized bed // Theory , Design and Operation of CFB Boiler / China Electricity Press , 1998. P. 480-481 [in Chinese].

9. Jing , X. M. , Wang , Q. , Zhang , J. B. Design and operation for oil shale CFB boiler // Power Engineering. 1998. Vol. 8 , No. 3. P. 22–28 [in Chinese].

 
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Publishing schedule:
No. 1: 20 March
No. 2: 20 June
No. 3: 20 September
No. 4: 20 December