Desulfurization characteristic by molten alkali carbonates at high temperature

Raharjo, Slamet and Naruse, Ichiro (2014) Desulfurization characteristic by molten alkali carbonates at high temperature. In: International Conference on Fluid and Thermal Energy Conversion 2006 , December 10 - 14, 2006, Jakarta, INDONESIA.

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Abstract

In order to remove H2S and COS in the gasified gas, produced by coal gasifires (e.g. IGFC) at high temperature, molten alkali carbonates (MAC) consisting of Na2CO3 and K2CO3 were applied as solvent. Before the removal experiments, the optimum experimental conditions were estimated in terms of the chemical equilibrium calculations. After that, the removal experiments of H2S and/or COS by the molten alkali carbonates were conducted in alumina tube furnace, varying the furnace temperature. As a result, H2S and COS were completely removed by the molten alkali carbonates. The concentrations of both H2S and COS in the clean-up gas became less than the detection limit of FPD gas chromatograph. Additionally, the regeneration tests at high temperature of used MAC following the removal tests were conducted by introducing CO2 as a regeneration agent into the reaction tube to form Na2CO3 and K2CO3.�The regeneration tests for Na2S and K2S in solid phase in the CO2 atmosphere, using a thermo-gravimetric analyzer, were also carried out. Under the present experimental conditions, it was hard to regenerate the used MAC. Keywords: Gas clean-up, Desulfurization, Gasified gas, Molten alkali carbonate

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