NO<sub>χ</sub> Removal by Selective Noncatalytic Reduction with Urea Solution in a Fluidized Bed Reactor

Sang Mun Jeong; Sang Done Kim

Korean Journal of Chemical Engineering, Vol.16, No.5, 614-617, September, 1999

DOI10.1007/BF02708140 Export Citation

NO_χ Removal by Selective Noncatalytic Reduction with Urea Solution in a Fluidized Bed Reactor

Sang Mun Jeong, and Sang Done Kim^†

Department of Chemical Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Taejon, Korea

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A fluidized bed reactor has been developed to overcome the plugging problem of urea injection by employing a sparger rather than nozzles in the SNCR process for simultaneous removal of SO₂ and NO_x. In a developed fluidized bed reactor, the optimum temperature to remove NO_x is shifted to lower values, the reaction temperature window is widened with the presence of CO in flue gas, and NO conversion is higher than that in a flow reactor. The optmum amount of urea injection in the reactor is found to be above 1.2 based on the normalized stoichiometric molar ratio (NSR) with respect to NO conversion. In the simultaneous removal of SO₂/NO, conversions of SO₂ and NO reach 80∼90%, nearly the same values for the individual removal of SO₂ and NO above 850℃.

Keywords:NO_χ Removal;Urea;Selective Noncatalytic Reduction(SNCR);Nozzle;Fluidized Bed

[References]

Caton JA, Siebers DL, Combust. Sci. Technol., 65, 277 (1989)
Caton JA, Narney JK, Cariappa C, Laster WR, Can. J. Chem. Eng., 73(3), 345 (1995)
Duo W, Dam-Jonhansen K, Ostergaard K, Can. J. Chem. Eng., 70, 1014 (1992)
Gullett BK, Groff PW, Lin ML, Chen JM, J. Air Waste Manage. Assoc., 44, 1188 (1994)
Jodal M, Nielsen C, Hulgaard T, Dam-Johansen K, "Pilot-Scale Experiments with Ammonia and Urea as Reductants in Selective Non-Catalytic Reduction of Nitric Oxide," 23rd Symp. Int. on Combustion, 237 (1990)
Kiil S, Bhatia SK, Damjohansen K, Chem. Eng. Sci., 51(4), 587 (1996)
Leckner B, Amand LE, "Emissions from a Circulating and a Stationary Fluidized Bed Bioler," Proceedings of the 9th International Conference of FBC, 2, 891 (1987)
Leckner B, Karlsson M, Dam-Johansen K, Weinell CE, Kilpinen P, Hupa M, Ind. Eng. Chem. Res., 30, 2396 (1991)
Lee JB, Kim SD, J. Chem. Eng. Jpn., 29(4), 620 (1996)
Lim YI, Yoo KS, Jeong SM, Kim SD, Lee JB, Choi BS, HWAHAK KONGHAK, 35(1), 83 (1997)
Lin W, Johnsson JE, DamJohansen K, van den Bleek CM, "Interactions Between NO_x Emission and Desulphurization in FBC: A Laboratory Study of Catalytic NH₃ Oxidation over CaO based Sorbent During Sulphation," Proceedings of the 12th International Conference on FBC, 2, 1093 (1993)
Suhlmann J, Rotzoll G, Fuel, 72, 175 (1993)
Wallman PH, Carlsson RCJ, Fuel, 72, 187 (1993)
Ostberg M, Damjohansen K, Johnsson JE, Chem. Eng. Sci., 52(15), 2511 (1997)

[Referenced By]

[1] Caton JA, Siebers DL, Combust. Sci. Technol., 65, 277 (1989)

[2] Caton JA, Narney JK, Cariappa C, Laster WR, Can. J. Chem. Eng., 73(3), 345 (1995)

[3] Duo W, Dam-Jonhansen K, Ostergaard K, Can. J. Chem. Eng., 70, 1014 (1992)

[4] Gullett BK, Groff PW, Lin ML, Chen JM, J. Air Waste Manage. Assoc., 44, 1188 (1994)

[5] Jodal M, Nielsen C, Hulgaard T, Dam-Johansen K, "Pilot-Scale Experiments with Ammonia and Urea as Reductants in Selective Non-Catalytic Reduction of Nitric Oxide," 23rd Symp. Int. on Combustion, 237 (1990)

[6] Kiil S, Bhatia SK, Damjohansen K, Chem. Eng. Sci., 51(4), 587 (1996)

[7] Leckner B, Amand LE, "Emissions from a Circulating and a Stationary Fluidized Bed Bioler," Proceedings of the 9th International Conference of FBC, 2, 891 (1987)

[8] Leckner B, Karlsson M, Dam-Johansen K, Weinell CE, Kilpinen P, Hupa M, Ind. Eng. Chem. Res., 30, 2396 (1991)

[9] Lee JB, Kim SD, J. Chem. Eng. Jpn., 29(4), 620 (1996)

[10] Lim YI, Yoo KS, Jeong SM, Kim SD, Lee JB, Choi BS, HWAHAK KONGHAK, 35(1), 83 (1997)

[11] Lin W, Johnsson JE, DamJohansen K, van den Bleek CM, "Interactions Between NO_x Emission and Desulphurization in FBC: A Laboratory Study of Catalytic NH₃ Oxidation over CaO based Sorbent During Sulphation," Proceedings of the 12th International Conference on FBC, 2, 1093 (1993)

[12] Suhlmann J, Rotzoll G, Fuel, 72, 175 (1993)

[13] Wallman PH, Carlsson RCJ, Fuel, 72, 187 (1993)

[14] Ostberg M, Damjohansen K, Johnsson JE, Chem. Eng. Sci., 52(15), 2511 (1997)