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Hydrogen sulfide retention on limestone at high temperature and high pressure
The suitability of limestone as a sorbent for hydrogen sulfide was tested at coal gasification conditions. Experiments were carried out in a fixed bed reactor at pressures and temperatures up to 10 bars and 1223 deg K respectively. The influence of pressure, temperature, particle size and gas composition was tested. Especially the partial pressure of CO2 relative to the calcination pressure is important for the sulfur capacity of the limestone. This partial pressure is in practical systems determined by the gasification process employed. At low partial pressure of CO2 the limestone calcines and CaCO3 is converted into CaO. At these conditions an almost quantitative conversion of CaO to CaS was observed. The rate of reaction between CaO and H2S increased with decreasing particle diameter. At high partial pressure of CO2, CaCO3 is stable and the limestone remains incalcined. In this case the ultimate degree of conversion into CaS was below 0.25 even for very porous limestones. The conclusion is that for gasification processes with a partial pressure of CO2 below the equilibrium pressure over CaCO3, e.g. 0.2 bar at 1073 deg K and 2.0 bar at 1173 deg K, limestone is a suitable sorbent for hydrogen sulfide.
Hydrogen sulfide retention on limestone at high temperature and high pressure
The suitability of limestone as a sorbent for hydrogen sulfide was tested at coal gasification conditions. Experiments were carried out in a fixed bed reactor at pressures and temperatures up to 10 bars and 1223 deg K respectively. The influence of pressure, temperature, particle size and gas composition was tested. Especially the partial pressure of CO2 relative to the calcination pressure is important for the sulfur capacity of the limestone. This partial pressure is in practical systems determined by the gasification process employed. At low partial pressure of CO2 the limestone calcines and CaCO3 is converted into CaO. At these conditions an almost quantitative conversion of CaO to CaS was observed. The rate of reaction between CaO and H2S increased with decreasing particle diameter. At high partial pressure of CO2, CaCO3 is stable and the limestone remains incalcined. In this case the ultimate degree of conversion into CaS was below 0.25 even for very porous limestones. The conclusion is that for gasification processes with a partial pressure of CO2 below the equilibrium pressure over CaCO3, e.g. 0.2 bar at 1073 deg K and 2.0 bar at 1173 deg K, limestone is a suitable sorbent for hydrogen sulfide.
Hydrogen sulfide retention on limestone at high temperature and high pressure
Schwefelwasserstoffretention in Kalkstein bei hohen Temperaturen und hohen Drücken
Illerup, J.B. (author) / Dam-Johansen, K. (author) / Johnsson, J.E. (author)
1993
18 Seiten, 9 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
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