Hot gas desulphurization of red mud in the dual-layer granular bed filter

For the characteristics of filter material and structure the dual-layer granular bed filter itself possesses, it can solve the two main problems of pulverization of sorbent and non-uniform contact between solid and gas other reactors may have. To investigate the desulphurization properties of sorbent on the dual-layer granular bed filter, this paper made kinds of experiments to analyze factors affecting the reaction. Although increasing the rate of Fe/S can make the H₂S react fully, at the same time, the pressure drop of dual-layer granular bed filter becomes greater and results indicate that Fe/S of 4:3 is enough to ensure the full use of sorbent. Moreover, factors of temperature, water vapor content, inlet concentration of H₂S and so on also have favorable or adverse effects on desulphurization process and then , influencing the desulphurization efficiency.