Co-combustion of coal and biomass in a circulating fluidized bed combustor

Chaiwat Prompubess; Lursuang Mekasut; Pornpote Piumsomboon; Prapan Kuchontara

Korean Journal of Chemical Engineering, Vol.24, No.6, 989-995, November, 2007

DOI10.1007/s11814-007-0109-4 Export Citation

Co-combustion of coal and biomass in a circulating fluidized bed combustor

Chaiwat Prompubess, Lursuang Mekasut^†, Pornpote Piumsomboon, and Prapan Kuchontara

Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand

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In this research, co-combustion of coal and rice husk was studied in a circulating fluidized bed combustor (CFBC). The effects of mixed fuel ratios, primary air and secondary air flow rates on temperature and gas concentration profiles along riser (0.1 m inside diameter and 3.0 m height) were studied. The average particle size of coal from Maetah used in this work was 1,128 mm and bed material was sand. The range of primary air flow rates was 480-920 l/min corresponding to Ug of 1.0-2.0 m/s for coal feed rate at 5.8 kg/h. The recirculation rate through L-valve was 100 kg/hr. It was found that the temperatures along the riser were rather steady at about 800-1,000 degrees Celsius. The introduction of secondary air improved combustion and temperature gradient at the bottom of the riser, particularly at a primary air flow rate below 1.5 m/s. Blending of coal with biomass, rice husk, did improve the combustion efficiency of coal itself even at low concentration of rice husk of 3.5 wt%. In addition, the presence of rice husk in the feed stocks reduced the emission of both NOx and SO2.

Keywords:Circulating Fluidized Bed;Biomass;Coal;Co-combustion

[References]

Lee JM, Kim JS, Korean J. Chem. Eng., 6, 640 (1999)
Bahillo A, Cabanillas A, Gayan P, De Diego L, Adanez J, Cocombustion of coal and biomass in FB boilers: Model validation with experimental results from CFB pilot plant, 46th, 46th Int. Energy Agency Fluidized Bed Conversion, Florida, USA (2003)
Lee GS, Han GY, Kim SD, Korean J. Chem. Eng., 1, 71 (1984)
Natarajan E, Nordin A, Rao AN, Biomass Bioenerg., 14(5-6), 533 (1998)
Armesto L, Bahillo A, Veijonnen K, Cabanillas A, Otero J, Biomass Bioenerg., 23, 171 (2002)
Renewable Energy Potential, Department of Alternative Energy Development and Efficiency (DEDE), Ministry of Energy, Thailand (2000)
Fang M, Yang L, Chen G, Shi Z, Luo Z, Cen K, Fuel Process. Technol., 85(11), 1273 (2004)
Liu H, Gibbs BM, Fuel, 77, 1569 (1997)
Ozkan G, Dogu G, Chem. Eng. Process., 41(1), 11 (2002)
Dayton DC, Belle-Oudry D, Energy Fuels, 13(6), 1203 (1999)
Nussbaumer T, Energ Fuel., 17, 1510 (2003)
Liu DC, Mi T, Shen BX, Feng B, Energy Fuels, 16(2), 525 (2002)

[Referenced By]

[1] Lee JM, Kim JS, Korean J. Chem. Eng., 6, 640 (1999)

[2] Bahillo A, Cabanillas A, Gayan P, De Diego L, Adanez J, Cocombustion of coal and biomass in FB boilers: Model validation with experimental results from CFB pilot plant, 46th, 46th Int. Energy Agency Fluidized Bed Conversion, Florida, USA (2003)

[3] Lee GS, Han GY, Kim SD, Korean J. Chem. Eng., 1, 71 (1984)

[4] Natarajan E, Nordin A, Rao AN, Biomass Bioenerg., 14(5-6), 533 (1998)

[5] Armesto L, Bahillo A, Veijonnen K, Cabanillas A, Otero J, Biomass Bioenerg., 23, 171 (2002)

[6] Renewable Energy Potential, Department of Alternative Energy Development and Efficiency (DEDE), Ministry of Energy, Thailand (2000)

[7] Fang M, Yang L, Chen G, Shi Z, Luo Z, Cen K, Fuel Process. Technol., 85(11), 1273 (2004)

[8] Liu H, Gibbs BM, Fuel, 77, 1569 (1997)

[9] Ozkan G, Dogu G, Chem. Eng. Process., 41(1), 11 (2002)

[10] Dayton DC, Belle-Oudry D, Energy Fuels, 13(6), 1203 (1999)

[11] Nussbaumer T, Energ Fuel., 17, 1510 (2003)

[12] Liu DC, Mi T, Shen BX, Feng B, Energy Fuels, 16(2), 525 (2002)