Integrated hot and cold synthesis gas clean-up

Parvana Aksoy*, Isil Isik-Gulsac, Orcun Er, Alper Sarioglan, Siringul Ay, Ersin Uresin, Aykut Argonul, Yeliz Cetin, Fehmi Akgun, Husnu Atakul

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

It is generally accepted that gasification of coal is the most promising route for clean utilization of coal for different applications. The gasification process converts coal and other feedstocks into synthetic raw gas suitable for different utilization areas such as production of electricity, value-added chemicals and liquid fuels. However, coal-derived synthesis gas contains harmful contaminants which need to be removed. The sulfur removal is a must prior to utilization of the gasification products either as a fuel for gas turbines, gas engines or fuel cells or as a synthesis gas for Fischer-Tropsch syntesis, ammonia or methanol productions. Hydrogen sulfide and other sulfur compounds can cause corrosion in pipelines thus limit the plant lifetime. Hydrogen sulfide is also a well-known catalyst poison. For these reasons, it is necessary to reduce the H2S concentration around one ppmv level. A semi-pilot scale bubbling bed gasification system equipped with hot and cold synthesis gas (syngas) clean-up units has been installed at Energy Institute of TUBITAK MAM. This system has been used for coal derived syngas cleanup purposes. A pilot scale pressurized bubbling fluidized bed gasification system is also current being developed by TUBITAK MAM. By using a combination of various techniques, we have already been able to we reduced the H2S content of syngas below 1 ppmv level. The ongoing research efforts will be described in this paper with a particular focus on sulfur compounds removal. High temperature desulfurization performance of dolomite for coal derived syngas was investigated in this study. The results indicated that dolomite can be active in sulfur removal at the temperatures higher than 750°C. However, due to the thermodynamic equilibrium conditions, H2S clean-up was limited to around 150-200 ppmv in presence of water vapor. The presence of water vapor in the dolomite bed seemed to inhibit sulfidation reactions. On the other hand, the presence of CO2 in the gas stream did not have a suppressing effect on sulfidation reactions, whereas, it tended to depress the calcination of CaCO3 to CaO.

Original languageEnglish
Title of host publication29th Annual International Pittsburgh Coal Conference 2012, PCC 2012
Pages816-824
Number of pages9
Publication statusPublished - 2012
Externally publishedYes
Event29th Annual International Pittsburgh Coal Conference 2012, PCC 2012 - Pittsburgh, PA, United States
Duration: 15 Oct 201218 Oct 2012

Publication series

Name29th Annual International Pittsburgh Coal Conference 2012, PCC 2012
Volume1

Conference

Conference29th Annual International Pittsburgh Coal Conference 2012, PCC 2012
Country/TerritoryUnited States
CityPittsburgh, PA
Period15/10/1218/10/12

Keywords

  • Dolomite
  • Gasification
  • HS
  • Syngas clean-up
  • ZnO

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