Abstract:

Aiming at the shortcomings of the existing collaborative mercury removal technology and activated carbon spray mercury removal technology, a new method of preparing renewable magnetic mercury removal adsorbent using ferrospheres in fly ash was proposed.The modified ferrospheres with active component were prepared by dippingthermal decomposition method.The mercury removal performance of the modified ferrospheres in flue gas with complex components was investigated in fixed bed adsorption experiments and the mechanism of mercury removal was explored. After multiple recycling and regeneration mercury removal experiments,the results show that the modified ferrospheres maintain high mercury removal efficiency in complex lowchlorine flue gas，and it is of good acid resistance.The mercury removal performance of ferrospheres comes from the heterogeneous oxidation reaction of lattice oxygen or adsorbed oxygen, active chlorine and Hg0.The modified ferrospheres can be regenerated by heating in air stream containing O2 and HCl, and mercury will be desorbed from the adsorbent surface at high temperature.The modified ferrospheres adsorbent has good regeneration performance and maintains a strong mercury removal capacity after multiple recycling and regeneration.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">coalfont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">fired flue gas, mercury removal, magnetic adsorbent, regeneration