| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 106 === Chemical-Looping Combustion (CLC) process is a novel combustion system with the high combustion efficiency and able to separate CO2 from exhaust without extra energy consumptions. The reaction rate is deeply affected by the design of the reaction system, fluidization of the oxygen carrier, and the contact time between oxygen carrier and fuel. In this study, two kinds of liquid wastes isopropanol and EKC, were selected as fuel for chemical-looping combustion, which was carried out in the 1kWth interconnected fluidized bed with using Australian iron ore as oxygen carrier. The datum of pressure drop of each reactor were collected under variant operation conditions to estimate the solid circulation rate. The effect of gas flow rate of fuel reactor (FR), air reactor (AR), and loop seal (LS), solid inventory, reaction temperature, and kind of solvent waste on the composition of the exhaust gas were investigated.
In this system, the air and fuel reactors were fast-fluidized bed and bubbling bed, respectively. The oxygen carriers were transported stably between these two reactors for achieving a high CO2 selectivity. The optimal operation parameters for high CO2 yield rate were obtained at 3.5 L/min of nitrogen to LS, 4.5 L/min to air of AR, and 5 L/min of nitrogen and 1 mL/min of solvent to FR. The maximum solvent feeding rate was 4.5 mL/min with 1 L/min of nitrogen as carrier gas. The vaporization of the liquid played the key role in this combustion process. The system will be defluidized resulted from the insufficient gas flow rate. The oxygen carrier was sintered due to the deep reduction in a dead zone. In conclusion, the complete decomposition of solvent waste was achieved with over 80% of CO2 selectivity and purity. The small attrition loss rate (0.83 wt% for 5h) of the oxygen carriers showed that the practicality of natural Australia iron ore for chemical-looping-combustion process.
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