A Numerical Study on Thermal Dissociation of H2S

Authors: M. Moghiman, S. M. Javadi, A. R. Moghiman, S. Baghdar Hosseini

Abstract:

The main issue in sweetening natural gas is H2S dissociation. The present study is concerned with simulating thermal dissociation of H2S in industrial natural gas carbon black furnace. The comparison of calculated results against experimental measurements shows good agreement. The results show that sulfur derived from H2S thermal dissociation peaked at φ=0.95. H2S thermal dissociation is enhanced in equivalence ratio upper than 1 and H2S oxidization is increased in equivalence ratio lower than 1. H2 concentration of H2S thermal dissociation is increased with increase of equivalence ratio up to 1. Also, H2S concentration decreased in outlet as equivalence ratio increases. H2S thermal dissociation to hydrogen and Sulfur reduces its toxic characteristics and make economical benefits.

Keywords: Equivalence ratio, H2S, natural gas furnace, thermaldissociation.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055044

References:

[1] Yehya Elsayed, Mykola Seredych, Andrew Dallas, Teresa J. Bandosz Desufurization of Air at High and Low H2S Concentrations 2009.
[2] Cox B, Clarke P, Pruden B. Economics of thermal dissociation of H2S to produce hydrogen. Int J Hydrogen Energy, Vol. 23, No.7, pp. 531-544, 1998.
[3] Zaman J, Chakma A. Production of hydrogen and sulphur from hydrogen sulphide. Fuel Process Technol 1995; 41:159-98.
[4] Luinstra E. H2S: a potential source of hydrogen. Sulphur 1996; 244:31- 41.
[5] Luinstra EA. Hydrogen from H2S: technologies and economics. Sulfotech Research; May 1995.
[6] Cox B, Clarke P, Pruden B. Economics of thermal dissociation of H2S to produce hydrogen. Int J Hydrogen Energy 1998;23(7): 531-44.
[7] Farooque M, Fahidy TZ. Low potential oxidation of hydrogen sulfide on a rotating tripolar wiper-blade electrode via continuous anode reactivation. J Electrochem Soc 1977; 124(8):1192-5.
[8] Kalina DW, Mass Jr ET. Indirect hydrogen sulfide conversion: an acidic electrochemical process. Int J Hydrogen Energy 1985;10(3):157-62.
[9] T. Nunnally, K. Gutsol, A. Rabinovich, A. Fridman, A. Starikovsky, A. Gutsol, R.W. Potter.Dissociation of H2S in non-equilibrium gliding arc ÔÇÿÔÇÿtornado--discharge.International journal of Hydorgen energy 2009;34:7 618 - 7625.
[10] Fridman Alexander. Plasma chemistry. Cambridge University Press; 2008.
[11] Chivers T, Hyne JB, Lau C. The thermal decomposition of hydrogen sulfide over transition metal sulfides. Int JHydrogen Energy 1980;5:499-506.
[12] Kaloidas VE, Papayannakas NG. Hydrogen production from the decomposition of hydrogen sulfide. Equilibrium studies on the system H2S/H2/Si (i ┬╝ 1,.,8) in the gas phase. Int J Hydrogen Energy 1987;12(6):403-9.
[13] I.Traus, H. Suhr. H2S-Dissociation in an ozoniser discharge at elevated temperatures
[14] Raymont, E. D., Make hydrogen from hydrogen sulfide. Hydrocarbon Processing, 1975, July, 139-142
[15] Jones, W.P. and McGuirk, J. «Computation of a round turbulent jet dischargeing into a confined cross flow», Turbulent Shear Flows 2, L.J,S, Bradbury et al., Ed., Springer, p233(1980).
[16] Jones, W.P. and Whitelaw, J.H. "Calculation methods for reacting turbulent flows: A review", Combustion and flame, 48, pp 1-26 (1982).
[17] Warnat, Z.J., Maas, U. and Dibbe, R.W. "Combustion", 3rd Ed., Springer-verlag, Berlin, Germany (2001).
[18] Towler, G.P. and Lynn, S. Process for Recovery of Sulpur from Acid Gases, J.Chemical Engineering Communication, 1996, 54: 113-143.