Journal of Computers, Vol 6, No 2 (2011), 329-336, Feb 2011
doi:10.4304/jcp.6.2.329-336

Transient Modeling and Simulation of Coal Bed Methane Transmission Pipeline

Changjun Li, Wenlong Jia, Xia Wu, Enbin Liu

Abstract


The coal bed methane is methane mainly and it has less heavier than conventional natural gas, thus coal bed methane has a slightly higher value than natural gas. Developing and utilization of coal bed methane is an important way to release contraction between supply and demand of natural gas in China. The pipeline is principle way of transporting the coal bed methane from sources to end-users. In view of the characteristics of coal bed methane, equation of state BWRS is used to calculate the thermodynamic parameters. Then based on continuity equation, momentum equation, characteristic equations of non-pipe elements and flow quantity balance equation, the transient simulation mathematic model of coal bed methane transmission pipeline is built. Considering the slow transient characteristic of gas flowing, the implicit central difference method is used to transform partial differential equations of the model into finite difference equations. Aiming at non-linear characteristics of differential equations, Newton iteration format is constructed and the model’s solution method is discussed. Finally, MS Visual C++ is utilized to develop a simulation software name coal bed methane pipeline emulation system, and the practical applications are carried out. The results show the mathematic model built in the paper and its solving method are both feasible. They provide technical supports for reasonable design and operation of the coal bed methane pipelines.


Keywords


coal bed methane; pipeline transmission; mathematical model; implicit central difference method; simulation

References


[1] S. Mokhatab and W. A. Poe, HandBook of Natural Gas Transmission and Processing, Gulf Profeesional Publishing, Elsevier, USA, 2006

[2] J. H. Pan, “Unconventional Gas and its Pipelining(in Chinese),” OGST, vol.27, pp.1-3, November 2008.

[3] M. Z. Jiang, Z. Q. Zeng, “Modelling of Transient Flow in A Complex Branch-Like Pipeline Network System(in Chinese),” ACTA Petrolei Sinica, vol.13,No.4,pp.136-146.

[4] S. Tian, M. A. Adewumi, “Development of Analytical Design Equation for Gas Pipelines”, SPE Production & Facilities, pp.100-106,1994.

[5] J. Zhou, et al., “Simulation of Transient Flow in Natural Gas Pipelines,” 27th Annual Meeting PSIG (Pipeline simulation Interest Group), Albuquerque, New Mexico, 18-20 Oct 1995.

[6] A.J. Osiadacz, “Deferent Transient Models- Limitations, Advantages and Disadvantages,” 28th Annual Meeting PSIG (Pipeline simulation Interest Group), San Francisco, California, 23-25 Oct 1996.

[7] Osiadac A. J. “comparision of isothermal and non-isothermal transient models,” 30th Annual Meeting PSIG, Denver Colorado, October 1998.

[8] C. J. Li., M. Z. Jiang., “Galertkin Solution of Unsteady Flow in Complex Gas Pipeline(in Chinese),” Nature Gas Industry, vol. 18, pp. 65-68, May 1998.

[9] C. J. Li., Y. Bai., “An Unsteady Flow Analysis in Gas Transmssion Pipeline Based on Theory Based on Theory of Functional Analysis(in Chinese),” Journal of Chongqing Jianzhu University, vol. 27, No. 3, pp.38-43, June 2005.

[10] C. J. Li., “Natural Gas Pipeline Transmission (The 2th edition) (in Chinese),” Petroleum Industry Press, Beijing, 2008.

[11] N. R. Martinz et al., “Natural Gas Network Optimization and Sensibility Analysis”, SPE International Petroleum Conference and Exhibition in Mexico, Feb 2002.

[12] E. B. Liu., C. J. Li., “Study on Simulation of Nature Gas Gathring Pipeline network(in Chinese),” Journal of Xi’an Shiyou University(Natural Science Edition), Vol.24, No.3, pp.63-65, June 2009.

[13] R. I. II’kaev, V. E. Seleznev, and V. V. Aleshin, Numerical Simulation of Gas Pipeline Networks: theory, computational implementation and industrial applications, URSS, Moscow, 2005.

[14] L. F. Ayala, M. A. Adewumi., Low-Liquid Loading Multiphase Flow in Natural Gas Pipelines, Transactions of the ASME, vol.125, pp.284-253, December 2003.


Full Text: PDF


Journal of Computers (JCP, ISSN 1796-203X)

Copyright @ 2006-2013 by ACADEMY PUBLISHER – All rights reserved.