IMPROVEMENTS AND SUCCESS IN CATALYST REGENERATION

摘要

The DeNOx catalyst regeneration process originated in Germany, with Ebinger Kat (formerly Envica Kat), to meet the European catalyst aftermarket needs. The types of coal fired in America are quite different from those fired throughout Europe, leading to different catalyst poisons and blinding agents. Due to this difference, as well as others, the catalyst regeneration process had to be customized to meet the North American market needs. This has been especially challenging because of the many different kinds of coal fired, from anthracite to lignite, all with varying degrees of constituents. SCR-Tech has made several important changes to the original regeneration process to more efficiently remove unwanted species and to optimize the resulting activity while maintaining or lowering the SO_2 to SO_3 oxidation rate. These process improvements were made possible by SCR-Tech learning from experience plus its independent collaborative research. SCR-Tech continues to improve the catalyst regeneration process by continuing to analyze results of their SO_2 to SO_3 oxidation study and by initiating a mercury oxidation investigation. Using the data collected over the past four years SCR-Tech has developed a thorough database of catalyst regeneration parameters and their effect on the process. Previously only able to offer regeneration resulting in 95% of original activity while hopefully maintaining the SO_2 to SO_3 oxidation rate, this database has enabled SCR-Tech to surpass both of these allowing it to guarantee, as a minimum, a return to original capabilities. In addition to its own studies, SCRTech has carried on investigations with interested utility partners, enabling it to specifically identify process parameters that improve the final results. An investigation into mercury oxidation is now underway and it is envisioned, from preliminary results, that mercury oxidation can be improved without negatively affecting SO_2 to SO_3 oxidation.