선탁의 종류, 농도 및 첨가제가 석탄-물 혼합연료의 유동특성에 미치는 영향

김수호; 황갑성; 홍성선

Journal of the Korean Industrial and Engineering Chemistry, Vol.8, No.4, 640-644, August, 1997

Export Citation

선탁의 종류, 농도 및 첨가제가 석탄-물 혼합연료의 유동특성에 미치는 영향

The Effects of a Type and Concentration of Coal and Additive on the Rheological Characteristics of CWM

김수호, 황갑성, 홍성선

초록

석탄의 종류와 농도 및 CWM의 유동성을 증가시키기 위해 첨가되는 계면활성제와 전해질이 CWM의 유동특성에 미치는 영향을 조사하였다. 탄종에 따른 CWM의 점도는 O/C 비가 높을 수록 높게 나타났다. 또한 CWM은 항복응력을 갖는 비뉴톤유체의 특성을 나타내며, 항복응력은 농도가 증가함에 따라 선형적으로 증가하였다. 첨가제로 사용된 계면활성제에 따른 CWM의 유동특성은 첨가되는 계면활성제의 농도에 관계없이 n<1인 pseudoplastic의 특성을 나타내었다. 또한 전해질의 투입량이 증가할수록 n은 1로 접근하여 CWM이 뉴톤유체에 접근하는 것으로 나타났으며, 전해질을 0.05wt.% 이상 첨가하였을 때는 항복응력이 나타나지 않았다.

We investigated that how both the type and the concentration of coal and the surfactant and the electrolyte added to increase the fluidity of CWM influence rheological characteristics. According to the type of coal, the viscosity of CWM was increased with increasing O/C ratio. Also, the CWM was represented the property of non-Newtonian fluid, having yield stress which was linerarly increased with increasing coal concentration. According to the surfactant used as an additive, the rheological characteristics of CWM was represented the pseudoplastic property as n < 1 without relating to the concentration of added surfactants. Also, according to the increase of the amount of electrolyte, n was nearly approached 1. Therfore, we found that CWM opproched Newtonian fluid and that when more than 0.05wt.% of electrolyte were added, yield stress was not shown up.

[References]

Lawn CJ, "Principles of Combustion Engineering for Boilers," Chapter 4, Academic Press, New York (1987)
Roh NS, Kim KH, Kim DC, HWAHAK KONGHAK, 33(3), 282 (1995)
Roh NS, Shin DH, Kim JD, Kim KH, Kim DC, Energy Eng. J., 4, 163 (1995)
Rakitsky WG, Knell EW, Murphy TJ, "Rheological Properties Significant for the Atomization of Coal-Water Fuels," Proc. of the 11th Int. Conf. on Slurry Technology, Hilton Head, S.C., March 16-18, pp. 137-143 (1986)
Morgan ME, Heaton HL, Scheffee RS, "A Yield Stress of CWF," Proc. of the 7th Int. Symp. on Coal Slurry Combustion and Technology, New Orleans, La., May 21-24, p. 104-113 (1985)
Kaji R, Muranaka Y, Miyadera H, Hishinuma Y, AIChE J., 33, 11 (1987)
Ji PS, "A Study on Combustion and Technology of Coal-Water Mixture Fuels," Report, Korea Electric Power Coporation, KRC-85G-J04, 554p (1990)
Hanks RW, "Hydraulic Design for Flow of Complex Fluids," R.W. Hanks Assoc., Inc., Orem, Utah (1981)
Tadros TF, "Use of Surfactants and Polymers for Preparation and Stabilization of Coal Suspensions," Proc. of the 2nd European Conf. on Coal Liquid Mixtures, London, September 16-18, pp. 1-16 (1985)
Govier GW, Aziz K, "The Flow of Complex Mixture in Pipes," Robert E. Krieger, Publishing Co., Inc., New York (1972)

[Referenced By]

[1] Lawn CJ, "Principles of Combustion Engineering for Boilers," Chapter 4, Academic Press, New York (1987)

[2] Roh NS, Kim KH, Kim DC, HWAHAK KONGHAK, 33(3), 282 (1995)

[3] Roh NS, Shin DH, Kim JD, Kim KH, Kim DC, Energy Eng. J., 4, 163 (1995)

[4] Rakitsky WG, Knell EW, Murphy TJ, "Rheological Properties Significant for the Atomization of Coal-Water Fuels," Proc. of the 11th Int. Conf. on Slurry Technology, Hilton Head, S.C., March 16-18, pp. 137-143 (1986)

[5] Morgan ME, Heaton HL, Scheffee RS, "A Yield Stress of CWF," Proc. of the 7th Int. Symp. on Coal Slurry Combustion and Technology, New Orleans, La., May 21-24, p. 104-113 (1985)

[6] Kaji R, Muranaka Y, Miyadera H, Hishinuma Y, AIChE J., 33, 11 (1987)

[7] Ji PS, "A Study on Combustion and Technology of Coal-Water Mixture Fuels," Report, Korea Electric Power Coporation, KRC-85G-J04, 554p (1990)

[8] Hanks RW, "Hydraulic Design for Flow of Complex Fluids," R.W. Hanks Assoc., Inc., Orem, Utah (1981)

[9] Tadros TF, "Use of Surfactants and Polymers for Preparation and Stabilization of Coal Suspensions," Proc. of the 2nd European Conf. on Coal Liquid Mixtures, London, September 16-18, pp. 1-16 (1985)

[10] Govier GW, Aziz K, "The Flow of Complex Mixture in Pipes," Robert E. Krieger, Publishing Co., Inc., New York (1972)