New type of dry flue gas treatment using layered double hydroxide

Abstract

Recently, it has become desirable to install CO₂ recovery facilities in waste incineration facilities. However, there is concern that the CO₂ absorbent may deteriorate due to acid gas components in the flue gas at the guaranteed level of conventional dry treatment, and advanced treatment that can guarantee an acid gas concentration of 3 ppm or less is desired. In this study, a new type of dry flue gas treatment using renewable layered double hydroxide (LDH) as an adsorbent was investigated in order to achieve both advanced treatment of acid gases for CO₂ capture and maintenance of high efficiency power generation. The outline of the new dry-type flue gas treatment system and the repeated adsorption and regeneration tests of LDH, which is the basis of the new system, are reported.