COAL COMBUSTION CHARACTERISTICS IN A FLUIDIZED BED COMBUSTOR WITH A DRAFT TUBE

Lee WJ; Cho YJ; Kim JR; Kim SD

Korean Journal of Chemical Engineering, Vol.9, No.4, 206-211, October, 1992

The effects of gas velocity to draft tube (3-6_mf), bed temperature (800-900℃) and excess air ratio(0-3%) on the total entrainment rate, overall combustion efficiency and heat transfer coefficient have been determined in an internally circulating fluidized bed combustor with a draft tube. The total entrainment rate increases with an increase in gas velocity to draft tube, but deceases with increasing bed temperature and excess air ratio. The overall combustion efficiency increases with increasing excess air ratio, but decreases with increasing gas velocity to draft tube. The overall combustion efficiency obtained in internally circulating fluidized beds was found o be somewhat higher than that in a bubbling fluidized bed combustor.

[References]

LaNauze RD, Powder Technol., 15, 117 (1976)
Yang WC, Keairns DL, AIChE Symp. Ser., 74, 218 (1978)
Kuramoto M, Kunii D, Furusawa T, Powder Technol., 47, 141 (1986)
Choi YT, Kim SD, J. Chem. Eng. Jpn., 24, 195 (1991)
Lee WJ, Kim SD, Fluidization VII, ed. Potter, O.E. and Nicklin, D.J., Engineering Foundation, New York, 479 (1992)
McCabe WL, Smith JC, Harriott P, "Unit Operations of Chemical Engineering," 4th ed., McGraw-Hill Book Company, New York (1985)
Benett CO, Myers JE, "Momentum, Heat and Mass Transfer," McGraw-Hill, New York, 370 (1974)
Muir JR, Berruti F, Behie LA, Chem. Eng. Commun., 88, 153 (1990)
Choi JH, Son JE, Kim SD, J. Chem. Eng. Jpn., 22, 597 (1989)
Geldart D, "Gas Fluidization Technology," John Wiley & Sons, New York, 123 (1986)
Chan IH, Knowlton TM, Fluidization, ed. Kunii, D. and Toei, R., Engineering Foundation, New York, 283 (1984)
Chakraborty RK, Howard JR, J. Inst. Energy, 54, 48 (1981)
Field MA, Gill DW, Morgan BB, Hawsley PGW, Combustion of Pulverized Coal British Coal Utilization Research Association, Leatherland, U.K. (1967)
Pattipati RR, Wen CY, Proc. of the 2nd World Congress of Chem. Eng., 2, 42 (1981)
Park SS, Choi YT, Lee GS, Kim SD, "Circulating Fluidized Bed Technology," ed., Basu et al., Pergamon Press, New York, 497 (1991)
Park BY, "Combustion Characteristics of House Heating Fluidized Bed Coal Combustor," M.S. Thesis, KAIST (1985)
Grewal NS, Saxena SC, Ind. Eng. Chem. Process Des. Dev., 20, 116 (1981)
Chernov VD, Serebryakov BR, Dalin MA, Int. Chem. Eng., 12, 239 (1972)
Khaechenko NV, Makhorin KE, Int. Chem. Eng., 4, 650 (1964)
Yaverbaum L, "Fluidized Bed Combustion of Coal and Waste Materials," Noyes Data Co., New Jersey, 67 (1977)

[Referenced By]

[1] LaNauze RD, Powder Technol., 15, 117 (1976)

[2] Yang WC, Keairns DL, AIChE Symp. Ser., 74, 218 (1978)

[3] Kuramoto M, Kunii D, Furusawa T, Powder Technol., 47, 141 (1986)

[4] Choi YT, Kim SD, J. Chem. Eng. Jpn., 24, 195 (1991)

[5] Lee WJ, Kim SD, Fluidization VII, ed. Potter, O.E. and Nicklin, D.J., Engineering Foundation, New York, 479 (1992)

[6] McCabe WL, Smith JC, Harriott P, "Unit Operations of Chemical Engineering," 4th ed., McGraw-Hill Book Company, New York (1985)

[7] Benett CO, Myers JE, "Momentum, Heat and Mass Transfer," McGraw-Hill, New York, 370 (1974)

[8] Muir JR, Berruti F, Behie LA, Chem. Eng. Commun., 88, 153 (1990)

[9] Choi JH, Son JE, Kim SD, J. Chem. Eng. Jpn., 22, 597 (1989)

[10] Geldart D, "Gas Fluidization Technology," John Wiley & Sons, New York, 123 (1986)

[11] Chan IH, Knowlton TM, Fluidization, ed. Kunii, D. and Toei, R., Engineering Foundation, New York, 283 (1984)

[12] Chakraborty RK, Howard JR, J. Inst. Energy, 54, 48 (1981)

[13] Field MA, Gill DW, Morgan BB, Hawsley PGW, Combustion of Pulverized Coal British Coal Utilization Research Association, Leatherland, U.K. (1967)

[14] Pattipati RR, Wen CY, Proc. of the 2nd World Congress of Chem. Eng., 2, 42 (1981)

[15] Park SS, Choi YT, Lee GS, Kim SD, "Circulating Fluidized Bed Technology," ed., Basu et al., Pergamon Press, New York, 497 (1991)

[16] Park BY, "Combustion Characteristics of House Heating Fluidized Bed Coal Combustor," M.S. Thesis, KAIST (1985)

[17] Grewal NS, Saxena SC, Ind. Eng. Chem. Process Des. Dev., 20, 116 (1981)

[18] Chernov VD, Serebryakov BR, Dalin MA, Int. Chem. Eng., 12, 239 (1972)

[19] Khaechenko NV, Makhorin KE, Int. Chem. Eng., 4, 650 (1964)

[20] Yaverbaum L, "Fluidized Bed Combustion of Coal and Waste Materials," Noyes Data Co., New Jersey, 67 (1977)