Characteristics of Spray-Dried K2CO3-MgO Solid Sorbent for CO2 Capture from Power Plant Flue Gas

摘要

Three K2CO3-MgO based solid sorbents were prepared with a spray drying method to prevent the degradation of the chemical reactivity of K2CO3-Al2O3 sorbents named KEP-CO2P, which were produced in bulk. Their physical properties and reactivity were screened to evaluate their applicability to a 0.5 MWe (2,000 Nm(3)/h) CO2 capture pilot plant built for Unit 3 and a 10 MWe (40,000 Nm(3)/h) CO2 capture pilot plant built for Unit 8 of the Hadong thermal power station. The CO2 sorption capacity and percentage utilization of K2CO3-MgO based sorbent, Sorb-KM2, was 8.6 wt% (g-CO2/100g-sorbent) and 90%, respectively, along with good mechanical strength for fluidized-bed application. Sorb-KM2 was tested using a 2 Nm(3)/h circulating fluidized bed process to evaluate their applicability to a fluidized bed process, and the chemical and structural characteristics were investigated by PSA, FE-SEM, EPMA and XPS.