Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
DEVELOPMENT OF CO2 SORBENTS DOPED WITH RICE HUSK ASH APPLIED TO CALCIUM LOOPING
Submission Author:
Murilo Silva , SP
Co-Authors:
Murilo Silva, Robson Rocha Oliveira, Carlos Manuel Romero Luna, José Caraschi, Gretta Larisa Aurora Arce Ferrufino, Mérilin Cristina dos Santos Fernandes, Cristiane Campos, Nicole Musielak, Nerio Arce Ferrufino
Presenter: Murilo Silva
doi://10.26678/ABCM.COBEM2023.COB2023-0794
Abstract
Brazil has a great potential for the production of combustible gases (syngas) from various types of biomass. Therefore, the use of biomass will be encouraged in the coming years, since CH4 is considered the fuel of the energy transition, due to the possibility of generating future fuels, such as hydrogen (H2). Currently, syngas is not very commercially attractive because, in addition to operating costs, it is mixed with carbon dioxide (CO2) and other gases, thus, CO2 must be separated from the syngas for commercialization. One economically viable alternative for purifying gases containing CO2 is the Calcium Looping (CaL) process. CaL has several potential benefits for industrial applications, but the biggest challenge is to increase the capture capacity of the mineral sorbents (limestones) that quickly and progressively deactivate with use. Calcium-based sorbents doped with inert materials (MgO, Al2O3, ZrO2, TiO2, SiO2, etc.) have been widely studied in recent years and are known as an efficient method for improving their capture capacity, however, their high preparation cost is their biggest disadvantage. In Brazil, energy generation from biomass burning produces large amounts of ash that generate environmental problems due to their final disposition. These ashes contain high levels of inert materials that can be used to dope limestones, but little is known about this. The article evaluated the performance of dolomitic and calcitic limestones doped with rice husk ashes. The results indicate that ashes produced from rice husks have 96.33±0.08% of ash, 2.56±0.11% of volatile materials, and 1.74±0.05% of humidity. Loss on ignition indicates that the ashes have a mass loss of 5.19±0.28%, of which 4.30% refers to humidity and volatile material, and the rest is the volatilization of metals with low melting points. XRF analysis indicates that the ashes contain 93.26% of SiO2, 1.96% of CaO, 2.85% of K2O, 0.63% of Al2O3, 0.51% of Fe2O3, and 0.01% of Na2O and SO3. The limestone used was ground and taken for analysis. The results indicate that it has 0.5±0.2% humidity, 55.41% CaO, 0.12% MgO, and 44.77% CO2 mainly. The cyclic tests of calcination/carbonation indicate that the limestone doped with rice husk ashes performed better than natural limestone. When compared to limestone doped with SiO2, limestone doped with CCA was better, probably due to the greater surface area provided by the rice husk ashes.
Keywords
Calcium Looping, Sorbents, Rice husk ash, CO2, Doped Sorbents, Hydrogen, energy
