Abstract

Liquid fuels such as bitumen, tars, and pitches are byproducts of heavy oil upgrading processes, and are usually contaminated with high sulphur and sometimes heavy metals contents as well. Fluidized bed combustion (FBC) appears to be a promising technology for the combustion of such fuels due to its inherent fuel flexibility and low emissions characteristics. The combustion of three liquid fuels, i.e., no. 6 oil, bitumen and pitch was investigated in a pilot-scale bubbling FBC unit. An efficient liquid fuel feeding system was developed and a bubbling FBC was successfully used to combust all three liquid fuels. The proportion of fuel escaping in the form of unburnt hydrocarbons in the flue gas was less than 0.4 percent and combustion efficiencies higher than 98.5 percent were achieved. However, combustion of liquid fuels tended to occur in the freeboard and, therefore, good mixing of the fuels in the bed was critical in achieving satisfactory combustion performance.

Issue Section:
Technical Papers
Keywords:
combustion, fluidised beds, fuel, oil technology, bubbles, pollution control, liquids
Topics:
Combustion, Emissions, Fuels, Sulfur, Fluidized beds, Temperature, Asphalt, Bituminous materials, Pitch (Bituminous material), Flue gases
1.
North, B., Eleftheriades, C., and Engelbrecht, A., 1999, “Destruction of a High Sulphur Pitch in an Industrial Scale Fluidized Bed Combustor,” Proc., 15th International Conference on Fluidized Bed Combustion, ed., R. B. Reuther, ASME, CD-ROM FBC99-0017.
2.
Miccio, F., Miccio, M., Repetto, L., and Gradassi, A. T., 1999, “Dispersion and Combustion of a Bitumen-based Emulsion in Bubbling Fluidized Bed,” Proc., 15th International Conference on Fluidized Bed Combustion, ed., R. B. Reuther, ASME, CD-ROM FBC99-0141.
3.
Barthelemy, J., Tanca, M., and Ruggeri, G., 2001, “Economics and Design Considerations of Firing Petroleum Coke in a CFB,” Proc., 16th International Conference on Fluidized Bed Combustion, ed., D. W. Geiling, ASME, CD-ROM FBC01-0009.
4.
Wu, S., Tuncay, J., and Sellakumar, K. M., 2001, “Combustion Characteristics of Refinery Residues in Circulating Fluidized Beds and Their Byproducts,” Proc., 16th International Conference on Fluidized Bed Combustion, ed., D. W. Geiling, ASME, CD-ROM FBC01-0185.
5.
Barczus, C., Blanke, T., Henning, B., and Scherer, V., 2001, “Combustion of Liquid Refinery Residues in a Circulating Fluidized Bed,” Proc., 16th International Conference on Fluidized Bed Combustion, ed., D. W. Geiling, ASME, CD-ROM FBC01-0152.
6.
Lafanechere, L., Thomas, P., Evrard, R., and Briand, P., 2001, “Environmental, Thermal and Hydrodynamic Influence of the Fuel Combustion in the CFB Plant of SOMEDITH (60 MWth),” Proc., 16th International Conference on Fluidized Bed Combustion, ed., D. W. Geiling, ASME, CD-ROM FBC01-0067.
1.
Anthony, E. J., Desai, D. L., Friedrich, F. D., and Smith, D., 1986, “Description of the Mark II Atmospheric Fluidized Bed Combustor at the Combustion and Carbonization Laboratory, CANMET,” Division Report ERP/ERL 86-45(TR);
2.
CANMET, Energy, Mines and Resources Canada.
1.
Desai, D. L., Anthony, E. J., Friedrich, F. D., and Razbin, V. V., 1986, “Fluidized Bed Combustion of a High-Sulphur Eastern Canadian Coal,” presented at Jt. ASME/IEEE Power Generation Conference, Portland, OR.
2.
Brereton
,
C. M. H.
,
Lim
,
C. J.
,
Grace
,
J. R.
,
Luckos
,
A.
, and
Zhu
,
J.
,
1995
, “
Pitch and Coke Combustion in a Circulating Fluidized Bed
,”
Fuel
,
74
(
10
), pp.
1415
–
1423
.
3.
Anthony
,
E. J.
,
1995
, “
Fluidized Bed Combustion of Alternative Solid Fuels: Status, Successes and Problems of the Technology
,”
Prog. Energy Combust. Sci.
,
21
(
3
), pp.
239
–
268
.
Copyright © 2002
 by ASME
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