| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 107 === The tech industry becomes the major industry in Taiwan gradually due to the increase in the demand of computer, communication, and consumer electronics. The amount of organic solvent used for manufacture thus is increased sharply. Some companies assign waste treatment companies to incinerate these waste solvent, resulting in plenty of air pollution and energy consumption. The chemical looping combustion (CLC) is a novel combustion process with flameless, high combustion efficiency, and direct separation of carbon dioxide. The operation conditions, such as reactor design, degree of fluidization, and contact time between gas and solid, will affect the reaction rate. The oxygen carrier plays the important role in CLC, and the natural iron ore is widely used due to its environmentally friendliness and cheap cost.
In this study, the Brazilian iron ore was used as the oxygen carrier, and the waste solvent of methyl ethyl ketone was used as the fuel. The experiment was carried out in interconnected fluidized bed. In this system, the air reactor and the fuel reactor were fast fluidized bed and bubbling bed, respectively. The oxygen carrier was transferred between the fuel reactor and the air reactor,
which provided oxygen in the fuel reactor and regained oxygen in the air reactor. The temperature, the pressure distribution and the composition of the exhaust gas (air reactor and fuel reactor) in the system were continuously monitored. Three parts of operating conditions were investigated in this work. In the first part, the effect of gas flow rate of air reactor and loop seal on fluidization phenomenon was analyzed to establish the basic operation parameters. The second part was the system temperature, which affected the carbon conversion and purity of CO2. In the last part, the maximum treatment capacity for waste solvent of this system was evaluated. The experimental results indicated that the optimal parameters were obtained at 7.5 L/min of air flow for air reactor, 4 L/min of N2 for loop seal, 750oC of the system. The maximum feed rate of solvent was 2 mL/min in this system. The composition of the flue gas was 83% carbon dioxide, 10% methane, 6% ethylene, 1% carbon monoxide. The research results can be used as a reference for the operation parameters of pilot.
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