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Energy exploitation of acid gas with high H2S content by means of a chemical looping combustion system

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  • García-Labiano, F.
  • de Diego, L.F.
  • Gayán, P.
  • Abad, A.
  • Cabello, A.
  • Adánez, J.
  • Sprachmann, G.

Abstract

In gas and petroleum industry, the waste gas stream from the sweetening process of a sour natural gas stream is commonly referred as acid gas. Chemical Looping Combustion (CLC) technology has the potential to exploit the combustible fraction of acid gas, H2S, to produce energy obtaining a flue gas highly concentrated on CO2 and SO2, which can be cost-effectively separated for subsequent applications, such as sulfuric acid production. At the same time, a concentrated CO2 stream ready for storage is obtained. The resistance of oxygen carriers to sulfur becomes crucial when an acid gas is subjected to a CLC process since the H2S content can be very high. In this work, a total of 41h of continuous operation with acid gas and H2S concentrations up to 20vol.% has been carried out in a 500 Wth CLC unit with two oxygen carriers based on Cu (Cu14γAl) and Fe (Fe20γAl). The formation of copper sulfides and the SO2 emissions in the air reactor made the Cu14γAl material not adequate for the process. In contrast, excellent results were obtained during acid gas combustion with the Fe20γAl oxygen carrier. H2S was fully burnt to SO2 in the fuel reactor at all operating conditions, SO2 was never detected in the gas outlet stream of the air reactor, and iron sulfides were never formed even at H2S concentrations as high as 20vol.%. Furthermore, it was found that a H2S content of 20vol.% in the acid gas was high enough to turn the CLC process into an auto-thermal process. Based on these results, it can be concluded that the Fe-based materials prepared by impregnation are very adequate to exploit the energy potential of acid gas mixtures with CO2 capture.

Suggested Citation

  • García-Labiano, F. & de Diego, L.F. & Gayán, P. & Abad, A. & Cabello, A. & Adánez, J. & Sprachmann, G., 2014. "Energy exploitation of acid gas with high H2S content by means of a chemical looping combustion system," Applied Energy, Elsevier, vol. 136(C), pages 242-249.
    • Handle: RePEc:eee:appene:v:136:y:2014:i:c:p:242-249
    DOI: 10.1016/j.apenergy.2014.09.041
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    References listed on IDEAS

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    1. Aisyah, L. & Ashman, P.J. & Kwong, C.W., 2013. "Performance of coal fly-ash based oxygen carrier for the chemical looping combustion of synthesis gas," Applied Energy, Elsevier, vol. 109(C), pages 44-50.
    2. Adánez-Rubio, Iñaki & Abad, Alberto & Gayán, Pilar & García-Labiano, Francisco & de Diego, Luis F. & Adánez, Juan, 2014. "The fate of sulphur in the Cu-based Chemical Looping with Oxygen Uncoupling (CLOU) Process," Applied Energy, Elsevier, vol. 113(C), pages 1855-1862.
    3. Moldenhauer, Patrick & Rydén, Magnus & Mattisson, Tobias & Younes, Mourad & Lyngfelt, Anders, 2014. "The use of ilmenite as oxygen carrier with kerosene in a 300W CLC laboratory reactor with continuous circulation," Applied Energy, Elsevier, vol. 113(C), pages 1846-1854.
    4. Markström, Pontus & Linderholm, Carl & Lyngfelt, Anders, 2014. "Operation of a 100kW chemical-looping combustor with Mexican petroleum coke and Cerrejón coal," Applied Energy, Elsevier, vol. 113(C), pages 1830-1835.
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    1. Wang, Haiming & Liu, Guicai & Veksha, Andrei & Giannis, Apostolos & Lim, Teik-Thye & Lisak, Grzegorz, 2021. "Effective H2S control during chemical looping combustion by iron ore modified with alkaline earth metal oxides," Energy, Elsevier, vol. 218(C).
    2. García-Labiano, Francisco & de Diego, Luis F. & Cabello, Arturo & Gayán, Pilar & Abad, Alberto & Adánez, Juan & Sprachmann, Gerald, 2016. "Sulphuric acid production via Chemical Looping Combustion of elemental sulphur," Applied Energy, Elsevier, vol. 178(C), pages 736-745.

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    Keywords

    Acid gas; Chemical looping combustion; H2S; H2SO4; Oxygen carrier;
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