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Retrofit of a 75T/H PC-Fired Boiler Into a Coal/Gas Co-Firing One

[+] Author Affiliations
Dazhui Wen, Donglin Chen, Huifang Xu

ChangSha University of Science and Technology, Changsha, Hunan, China

Paper No. POWER2011-55125, pp. 33-36; 4 pages
  • ASME 2011 Power Conference collocated with JSME ICOPE 2011
  • ASME 2011 Power Conference, Volume 1
  • Denver, Colorado, USA, July 12–14, 2011
  • ISBN: 978-0-7918-4459-5
  • Copyright © 2011 by ASME


For full use of low heat value of coke oven gas and operation under conditions of coal, gas and coal/gas, a previously 75t/h PC-fired boiler was retrofitted: six gas burners with dual-passage were installed under the originally PC-fired burners and tangentially arranged with a larger combustion circle and declined axes; the pulverized coal fired burners were declined downward 8∼10° so as to control the flame center; the heating surface of slag cooling tube and economizer were extended. The operation and test after the retrofit showed that: the combustion was very stable and temperature of the superheated steam was between the normal range under all conditions of load and fuel; the maximum steam rate was 59t/h and temperature of the exhaust flue gas was lower than 160°C under gas condition while gas flow was at 26000 Nm3/h; the maximum steam rate was 81t/h and temperature of the exhaust flue gas was lower than 147°C under coal condition; the maximum steam rate was 77t/h and temperature of the exhaust flue gas was about 155°C under coal/gas condition.

Copyright © 2011 by ASME
Topics: Boilers , Coal , Firing



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