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Received January 17, 2013
Accepted April 8, 2013
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The effect of noncondensable gas on heat transfer in the preheater of the sewage sludge drying system
Young Cheol Park
Joeng-Geun Kim
Gyoung Tae Jin†
Sang-Ho Lee
Jong-Ho Moon
Seung-Yong Lee
Sang-Il Choi
Korea Institute of Energy Reserch, 152, Gajeong-ro, Yuseong-gu, Daejeon 305-343, Korea
gtjin@kier.re.kr
Korean Journal of Chemical Engineering, July 2013, 30(7), 1375-1379(5), 10.1007/s11814-013-0055-2
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Abstract
We used a shell-and-tube type preheater to investigate the effect of noncondensable gas on heat transfer. In the preheater of the drying system, heat is exchanged between steam-air mixed gas which is dryer outlet gas and sewage sludge. To evaluate the performances of the preheater, water was first used in the tube-side material instead of sewage sludge and steam-air mixed gas in the shell-side material. The test variables were as follows: mixed gas inlet temperatures range from 95 to 120 ℃; inlet air content, mair/msteam from 55 to 83%; tube-side water flow rate from 42 to 62 kg/h. The shell-side heat transfer coefficient varied from 150 to 550W/m2K, which corresponds to the amount of noncondensable gas in the steam-air mixed gas and the overall heat transfer coefficient varied from 60 to 210W/m2K. Using sewage sludge as a tube-side material the overall heat transfer coefficient varied from 60 to 130W/m2K and the outlet temperature of sewage sludge was above 90 ℃, which is high enough for reducing energy consumption in the dryer by preheating the sewage sludge.
References
Jin GT, Park YC , Lee SY, Choi SI, Hwang GJ, Lee SH, Kim JG, Huh BS, Chang DY, Cho YS, Korean Patent, 10-1082971 (2011)
Revankar ST, Pollock D, Appl. Math. Modelling., 29, 341 (2005)
Rohsebow WM, Hartnett JP, Handbook of heat transfer, 1st Ed., McGraw-Hill, New York (1973)
Lee KW, No HC, Chu IC, Moon YM, Chun MH, Int. J. Heat Mass Transf., 49(11-12), 1813 (2006)
Zhu AM, Wang SC, Sun JX, Xie LX, Wang Z, Desalination, 214(1-3), 128 (2007)
Liao Y, Vierow K, Trans. ASME., 129, 988 (2007)
McCabe WL, Smith JC, Harriott P, Unit operations of chemical engineering, 5th Ed., McGraw-Hill, Singapore (1993)
Reid RO, Prausnitz JM, Poling BE, The properties of gases and liquids, 4th Ed., McGraw-Hill, Singapore (1988)
Kunii D, Levenspiel O, Fluidization engineering, 2nd Ed., Butterworth - Heinemann, Boston (1991)
Revankar ST, Pollock D, Appl. Math. Modelling., 29, 341 (2005)
Rohsebow WM, Hartnett JP, Handbook of heat transfer, 1st Ed., McGraw-Hill, New York (1973)
Lee KW, No HC, Chu IC, Moon YM, Chun MH, Int. J. Heat Mass Transf., 49(11-12), 1813 (2006)
Zhu AM, Wang SC, Sun JX, Xie LX, Wang Z, Desalination, 214(1-3), 128 (2007)
Liao Y, Vierow K, Trans. ASME., 129, 988 (2007)
McCabe WL, Smith JC, Harriott P, Unit operations of chemical engineering, 5th Ed., McGraw-Hill, Singapore (1993)
Reid RO, Prausnitz JM, Poling BE, The properties of gases and liquids, 4th Ed., McGraw-Hill, Singapore (1988)
Kunii D, Levenspiel O, Fluidization engineering, 2nd Ed., Butterworth - Heinemann, Boston (1991)
