The influence of mixing between NH3 and NO for a De-NOx reaction in the SNCR process

Gang-Woo Lee; Byung-Hyun Shon; Jeong-Gun Yoo; Jong-Hyeon Jung; Kwang-Joong Oh

Journal of Industrial and Engineering Chemistry, Vol.14, No.4, 457-467, July, 2008

DOI10.1016/j.jiec.2008.02.013 Export Citation

The influence of mixing between NH3 and NO for a De-NOx reaction in the SNCR process

Gang-Woo Lee, Byung-Hyun Shon^{1, †}, Jeong-Gun Yoo², Jong-Hyeon Jung³, and Kwang-Joong Oh⁴

R&D Institute of Yoosung Co. Ltd., Ulsan 689-892, Republic of Korea
¹Dept. of Environmental Engineering, Hanseo University, Seosan 356-820, Republic of Korea
²Dept. of Chemical Engineering, Hanseo University, Seosan 356-820, Republic of Korea
³Dept. of Health Admin, Sorabol College, Gyeongju 780-711, Republic of Korea
⁴Dept. of Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea

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The objective of this study was to determine the mixing effect on De-NOx in the selective non-catalytic reduction (SNCR) process using NH3 as a reductant. A bench scale reactor set-up was used to perform experimental investigations on the mixing in the SNCR process, using an injection of NH3, with or without an air injection, into the bulk gas. Mixing between NH3 and NO is a very important parameter, as are kinetic parameters, such as the NSR and reaction temperature. The type of NH3 with NO mixing method caused different De-NOx results, in which for the case of NH3 injected with air was more effective for NO reduction than under NH3 premixing conditions. For the case of air injection conditions, the NO reduction efficiency increased with increasing NSR, initial NO concentration, and retention time. The temperature for the maximum NO removal efficiency was 900 8C with ammonia premixing conditions, but was around 800 8C when ammonia was premixed and air was injected at the same time. That is, the optimization of the reductant mixing and injection conditions are very useful for improving the NO removal efficiency, as well as lowering the reaction temperature to that were optimal efficiency is observed. The optimum momentum ratio (J), which refers to the mixing characteristics, was found to be about 100 in this study.

Keywords:NOx removal;SNCR;Mixing

[References]

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Kang M, Park ED, Kim JM, Kim DJ, Yie JE, J. Ind. Eng. Chem., 12(2), 224 (2006)
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[Referenced By]

[1] Javed MT, Irfan N, Gibbs BM, J. Environ. Eng., 83, 251 (2002)

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

[3] Lee DW, Ryu JH, Jeong DH, Lee HS, Chun KM, Lee KY, J. Ind. Eng. Chem., 9(1), 102 (2003)

[4] US Patent 3,900,554 (1975)

[5] Kang M, Park ED, Kim JM, Kim DJ, Yie JE, J. Ind. Eng. Chem., 12(2), 224 (2006)

[6] Perry RA, Siebers DL, Nature, 324, 657 (1986)

[7] Miller JA, Bowman DT, Prog. Energy Combust. Sci., 15, 287 (1989)

[8] Robin MAI, Price HJ, Squires RT, in: Proceedings of the Joint EPA/ EPRI Symp. on Stationary Combust. NOx Control Section 5A, Springfield, VA, (1991), p. 99

[9] Bae SW, Roh SA, Kim SD, Chemosphere, 65, 170 (2006)

[10] Lodder P, Lefers JB, Chem. Eng. J., 30, 161 (1985)

[11] Muzio LJ, Arand JK, Teixeira DP, in: Proceedings of the 16th Symp. (Intern.) on Combust, The combustion Institute, Pitsburgh, USA, (1976), p. 199

[12] Banna SM, Branch MC, Combust. Flame, 42, 173 (1981)

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

[14] Dean AM, Hardy JE, Lyon RK, in: Proceedings of the 19th Symp. (Intern.) on Combus, The Combustion Institute, Pitsburgh, USA, (1982), p. 97

[15] Lyon RK, Hardy JE, Ind. Eng. Chem. Fundam., 25, 19 (1986)

[16] Fenimore CP, Combust. Flame, 37, 245 (1980)

[17] Østberg M, Ph.D. Thesis, Technical University of Denmark, Denmark, 1996

[18] Kasuya F, Glarborg P, Johnsson JE, Damjohansen K, Chem. Eng. Sci., 50(9), 1455 (1995)

[19] Furrer J, Deuber H, Hunsinger H, Kreisz S, Seifert A, Stohr J, Ishikawa R, Watanabe K, Waste Manage., 18, 417 (1998)

[20] Duo W, Dam-Johansen K, Ostergaard K, in: Proceedings of the 23th Symp. (Intern.) on Combus, The Combustion Institute, Pitsburgh, USA, (1990), p. 297

[21] Azuhata S, Akimoto H, Hishinuma Y, AIChE J., 28, 7 (1982)

[22] Ostberg M, Damjohansen K, Chem. Eng. Sci., 50(13), 2061 (1995)