The waste seashells were used for the removal of hydrogen sulfide from a hot gas stream. The sulphidation of waste seashells with H2S was studied in a thermogravimetric analyzer at temperature between 600 and 800oC. The desulfurization performance of the waste seashell sorbents was experimentally tested in a fixed bed reactor system. Sulfidation experiments performed under reaction conditions similar to those at the exit of a coal gasifier showed that preparation procedure and technique, the type and the amount of seashell, and the size of the seashell affect the H2S removal capacity of the sorbents. The pore structure of fresh and sulfided seashell sorbents was analyzed using mercury porosimetry, nitrogen adsorption, and scanning electron microscopy (SEM). Measurements of the reaction of H2S with waste seashells show that particles smaller than 0.631mm can achieve high conversion to CaS. According to TGA and fixed bed reactor results, temperature had influenced on H2S removal efficiency. As desulfurization temperature increased, desulfurization efficiency increased. Also, maximum desulfurization efficiency was observed at 800oC. Desulfurization was related to calcinations temperature.
Introduction
Materials and Methods
Results and Discussion
Conclusions