CWM 연료의 연소시 입자 가열속도와 입자 크기가 CWM 응집물 형성에 미치는 영향에 관한 전산모사 연구

김수호; 김영환; 황갑성; 홍성선

Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.3, 364-371, June, 1998

Simulation Study on the Effects of Heating Rate and Particle Size Distribution for the Formation of the Agglomerate During CWM Combustion

김수호, 김영환, 황갑성, 홍성선

초록

이론적인 입자 응집모델이 CWM 응집물에서 인접한 석탄입자들 사이의 응집력을 예측하기 위해서 전개되었다. 유연탄은 약 400℃ 또는 그 이상 가열될 때 석탄 입자들은 플라스틱성 거동으로의 전이 현상이 관찰될 수 있다. 석탄 입자들의 응집과정에서의 응집력은 입자들의 플라스틱성의 지속기간에 비례하는 것으로 알려져있다. 본 연구에서는 가열단계에서 CWM 연료의 응집물 형성에 미치는 영향을 입자 응집모델에 의하여 고찰하였다. 실험에 사용한 전산모사 프로그램은 RKG(Runge-Kutta-Gill) 방법을 이용하여 포트란으로 작성을 하였다. 입자 응집 모델에 의한 CWM 연료의 입자 응집과정에서의 응집력은 입자 가열속도에 반비례하며, 입자크기에 비례하는 것으로 나타났다.

A theoretical model of particle agglomeration was developed to investigate the adhesive force between contiguous coal particles in CWM agglomerate. While heating bituminous coal to about 400℃ or above, the transient occurrence of plastic behavior of coal particles can be observed. The adhesive force in the process of agglomeration of coal particles was found to be proportional to the duration of plasticity of the particles. In the research, how the heating rate and the particle size distribution of CWM fuel influenced the formation of the agglomerate in CWM fuel at the heat-up stage was investigated by the model of particle agglomeration. Simulation program used to this experiment was RKG method and was programmed by Fortran. It was represented that by the model of particle agglomeration, the adhesive force in the process of the particle agglomeration in CWM fuel was inversely proportional to the heating rate but proportional to particle size.

[References]

Lawn CJ, "Principles of Combustion Engineering for Boilers: Chapter 4," Academic Press, New York (1987)
Kim SH, Hwang KS, Hong SS, J. Korean Ind. Eng. Chem., 8(4), 640 (1997)
Holve DJ, Fletcher TH, Gomi K, Combust. Sci. Technol., 52, 269 (1987)
Tokuda K, Kaneko S, Moda M, Maruta T, Proc. of the 14th Int. Conf. on Coal & Slurry Technology, Clear-Water, Fla, April 24-27, 221 (1989)
Iki N, Nagai N, Hirai T, 일본기계학회논문집, 59, 373 (1993)
Kang SW, "Combustion and Atomization Studies of Coal-Water Fuel in a Laminar Flow Reactor and in a Pilot-Scale Furnace," Ph.D. Thesis, Dept. of Mechanical Engineering, M.I.T., Cambridge, Mass., 314 (1988)
Liu GE, Law CK, Fuel, 65, 171 (1986)
Shao JH, Huang ZS, Proc. of the 7th Int. Symp. on Coal Slurry Combustion and Technology, Tampa, Fla., 164 (1985)
Kang SW, Sarofim AF, Beer JM, Combust. Flame, 86, 258 (1991)
Fong WS, Peters WA, Howard JB, Fuel, 65, 251 (1986)
Carnahan B, Luther HA, Wilkes JO, "Applied Numerical Methods," John Wiley & Sons, Inc., New York (1969)
Riggs JB, "An Introduction to Numerical Methods for Chemical Engineers," Texas Tech. University Press. Texas (1988)
Annamalai K, J. Eng. Power, 101 (1979)

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

[2] Kim SH, Hwang KS, Hong SS, J. Korean Ind. Eng. Chem., 8(4), 640 (1997)

[3] Holve DJ, Fletcher TH, Gomi K, Combust. Sci. Technol., 52, 269 (1987)

[4] Tokuda K, Kaneko S, Moda M, Maruta T, Proc. of the 14th Int. Conf. on Coal & Slurry Technology, Clear-Water, Fla, April 24-27, 221 (1989)

[5] Iki N, Nagai N, Hirai T, 일본기계학회논문집, 59, 373 (1993)

[6] Kang SW, "Combustion and Atomization Studies of Coal-Water Fuel in a Laminar Flow Reactor and in a Pilot-Scale Furnace," Ph.D. Thesis, Dept. of Mechanical Engineering, M.I.T., Cambridge, Mass., 314 (1988)

[7] Liu GE, Law CK, Fuel, 65, 171 (1986)

[8] Shao JH, Huang ZS, Proc. of the 7th Int. Symp. on Coal Slurry Combustion and Technology, Tampa, Fla., 164 (1985)

[9] Kang SW, Sarofim AF, Beer JM, Combust. Flame, 86, 258 (1991)

[10] Fong WS, Peters WA, Howard JB, Fuel, 65, 251 (1986)

[11] Carnahan B, Luther HA, Wilkes JO, "Applied Numerical Methods," John Wiley & Sons, Inc., New York (1969)

[12] Riggs JB, "An Introduction to Numerical Methods for Chemical Engineers," Texas Tech. University Press. Texas (1988)

[13] Annamalai K, J. Eng. Power, 101 (1979)