The investigation of movement conditions of particles binary mixtures in chemical looping combustion of solid fuels

High temperature chemical looping combustion is one of the promising technologies for CO2 capture. The CLC reactor system consists of two principal reaction chambers: the air reactor (AR) and the fuel reactor (FR). High solid circulation rate between fuel and air reactors is very important for effective combustion of solid fuels in CLC. Some part of fuel ash particles is implemented in metal oxides flow. Thus, the circulation flux consists of heavy metal particles and light ash particles. Fluidization conditions of binary mixture of particles with different density and sizes are very important for CLC hydrodynamics. The investigation was made on cold model with interconnected reactors. The narrow fraction of Al2O3 with Sauter diameter 0.22 and 0.34 mm and density 3930 kg/m3 were used as bed materials. Silica sand with Sauter diameter 0.21 mm and density 2600 kg/m3 was a "coal ash". The investigations were made for mixture with volume fraction 50-95% of Al2O3. Small addition of sand gives a significant reduction of minimal fluidization velocity. There are a linear proportion between share of Al2O3 and pressure gradient. Some other phenomena were obtained in case of 0.34 mm Al2O3. Further investigations have aim to determine of light fraction addition on hydrodynamics of interconnected reactors.