Application of particle-scale modelling to the combustion of a char particle in a fluidised bed of CLOU particles

This research concerns the combustion of a biomass char in fluidised bed either inert silica particles or material capable supporting using chemical looping oxygen uncoupling (CLOU). An analytical solution for CLOU was developed, accounting reactions occurring within mass-transfer boundary layer finite thickness, surrounding particle. The considered were: (1) with to CO and CO2, (2) homogenous reaction O2, (3) release from particles. thickness layer, γ, evaluated correlation literature particle modelled as shrinking Results model were compared experiments performed by combusting birch-wood activated carbon (i.d. 30 mm) (CuO supported on mayenite) sand. Both types undertaken partial pressure oxygen, pO2, close equilibrium O2 over CuO at 1173 K, i.e. ∼0.016 bar O2. results agreed experimental observations both beds. In addition solution, fuller, numerical models which its surroundings discretised 1D solve mass balance equations assess validity assumptions made solution. To establish range conditions is valid, various cases simulated. For example, gasification CuO-particles CO2-rich gas. Hence, besides validation solutions provided insight into importance CO2 overall conversion industrial scale.