Heavy metal vaporization from wastes incinerated in fluid bed: identification of the kinetics by an inverse method

S. ABANADES; G. FLAMANT; D. GAUTHIER; S. TOMAS ; G. MAZZA

Sheffield, Reino Unido

Simposio; 4th INTERNATIONAL SYMPOSIUM ON WASTE TREATMENT TECHNOLOGIES; 2003

University of Sheffield and The Institution of Chemical Engineers (IChemE)

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:FR; mso-fareast-language:FR;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Abstract: This study addresses the emission of Heavy Metals (HM) during the incineration of municipal solid waste. A global method was developed to determine the vaporisation rate of the metal from the on-line analysis of exhaust gas. The method is an inverse method, which involves only the measured concentration of heavy metal in the exhaust gases and a model developed at the reactor scale. The inverse method consists in identifying the HM vaporisation rates at the particle level from only the on-line diagnostic results and using the developed bubbling bed model, whatever the considered waste. A model waste (solid matrix derived from real waste that was spiked with a heavy metal: Cd, Pb or Zn) was burned in a laboratory-scale fluidised bed to simulate the metal?s release during the waste incineration. An on-line analysis system was linked to the gas outlet of the reactor, and the metal vaporisation process was tracked successfully by measuring continuously by ICP-OES the relative HM concentration in exhaust gases.