TY - GEN
T1 - Integrated hot and cold synthesis gas clean-up
AU - Aksoy, Parvana
AU - Isik-Gulsac, Isil
AU - Er, Orcun
AU - Sarioglan, Alper
AU - Ay, Siringul
AU - Uresin, Ersin
AU - Argonul, Aykut
AU - Cetin, Yeliz
AU - Akgun, Fehmi
AU - Atakul, Husnu
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - Dolomite
KW - Gasification
KW - HS
KW - Syngas clean-up
KW - ZnO
UR - http://www.scopus.com/inward/record.url?scp=84877637088&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84877637088
SN - 9781622767861
T3 - 29th Annual International Pittsburgh Coal Conference 2012, PCC 2012
SP - 816
EP - 824
BT - 29th Annual International Pittsburgh Coal Conference 2012, PCC 2012
T2 - 29th Annual International Pittsburgh Coal Conference 2012, PCC 2012
Y2 - 15 October 2012 through 18 October 2012
ER -