Chemical-looping combustion and chemical-looping with oxygen uncoupling of kerosene with Mn- and Cu-based oxygen carriers in a circulating fluidized-bed 300 W laboratory reactor

摘要

The fuel conversion properties of two oxygen carriers, based on manganese- and copper-oxide, were investigated with sulfur-free kerosene in a chemical-looping reactor with continuous particle circulation. An injection system was used, in which kerosene was evaporated, mixed with superheated steam and fed directly into the chemical-looping reactor. The manganese-based oxygen carrier M4MZ-1200 was composed of 40 wt% Mn3O4 and 60 wt.% MgO-ZrO2 and was used for chemical-looping combustion (CLC) experiments for 17 h. The copper-based oxygen carrier C2Z-1050 was composed of 20 wt.% CuO and 80 wt% ZrO2 and was used for 45 h with fuel addition. With M4MZ-1200 oxygen carrier, 83-99.3% of the fuel carbon was converted to CO2 at temperatures between 800 °C and 950 °C and fuel flows equivalent to 144-462 W_(th). With C2Z-1050 oxygen carrier, 99.99% CO2 yield was achieved at 900 °C and 144 W_(th) fuel equivalent. The particles were analyzed before and after the experiments using XRD, SEM, BET surface area and particle size distribution. Whereas nearly the whole batch of M4MZ-1200 particles was disintegrated after the experiments, only about 5% of the C2Z-1050 particles turned to fines. This is the first time that combustion of liquid fuel using CLOU is demonstrated in a continuous unit.