| 内容提要: |
Several factors including feedstock composition, design features and operating conditions such as combustion temperature, air/fuel ratio, and sorbents which act either singly or in concert, have been identified as the causes of corrosion in Waste-to-Energy (WtE) plants. The combination of these factors inside the WtE boiler is complex, and cannot be easily determined by experiments due to lack of online measurements. The environment in WtE plants is dynamic and constantly changing, with local regions alternating between oxidizing and reducing environments. As a result a detailed understanding of the flue gas, deposit chemistry and corrosion potential of alkali compounds, Cl, S, and heavy metals have not yet been fully achieved.
Thermodynamic equilibrium calculation is a tool that widely been accepted to provide better understand and predict the chemical reactions of the ash-forming matter during combustion waste-derived fuels. Therefore, in this presentation, thermodynamic equilibrium calculation was combined with factorial design to study; 1) the interactions of different concentrations of elements in wastes on the deposit composition and corrosion potential in both oxidizing and reducing environment; 2) compare the efficiency of kaolin, lime, Silica, alumina, and sulfate on capturing alkali and heavy metals in both oxidizing and reducing conditions. The research is still on going and the results are not yet complete. The purpose of this presentation is to lay down the efficacy of the methodology used. The complete set of results will be presented in the next presentation. |