(92b) Chemical Looping Combustion of Coal with Annular Carbon Stripper

An integrated fuel reactor (FR) coupled with an annular carbon stripper (CS) was proposed for coal-fired chemical looping combustion. The FR was designed as two independent bubbling fluidized beds that efficiently used the reactor’s space and made the particle residence time longer and more uniform. An annular CS was integrated into the FR, which aimed to separate char from the oxygen carrier and decrease the system complexity. A coal-fired CLC system consisting of an integrated fuel reactor and an air reactor for fast fluidization was designed. A hot system of the 30-kWth coal-fired CLC system was built and operated. Coal particles were fed into the system, and the oxygen carrier was ilmenite. Continuous and stable operation of the hot model was achieved, and the solid circulation rate was easily controlled. The coal particle was found to be separated efficiently from the oxygen carrier using the annular CS and then concentrated in the FR. The carbon capture efficiency of the coal-fired CLC system was calculated and predicted, and the integrated FR with annular CS was concluded to greatly enhance the carbon capture efficiency of the coal-fired CLC system.