| 英文摘要 |
The chemical looping technology applying to waste solvent treatment was developed in this project. The advantages of high conversion of organic species and low energy consumption of chemical looping technology are benefit to treat waste solvent more efficiently. The key techniques including preparation methodology of oxygen carrier, solid transportation between fuel and air reactors and optimal design for waste solvent treatment are essential for development of chemical looping technology. The operation parameters for high decomposition rate on 20 % isopropanol (IPA) solution were found out, through thermogravimetric analysis, fixed-bed reactor, cold model moving bed testing and moving bed reactor experiments.
The screening and quantitative production process of oxygen carrier for high performance on reactivity, recyclability and good mechanical strength were successfully developed. The raw material of oxygen carrier was Fe2O3 provided by China Steel Company, therefore, the cost and availability of Fe2O3 would be feasible for commercial application in the future. Besides, heat value with regards to reaction of IPA and Fe2O3 oxygen carrier has been estimated, the overall reaction was exothermic that benefit in energy aspect. As to cold model moving bed testing, the mechanical transport device was able to sweep oxygen carrier from fuel reactor to air reactor, vice versa. The mechanical transport device provides with two functions that to move oxygen carrier and seal the gases between fuel and air reactors simultaneously. The empty-bed experiments in the fuel reactor were employed with various IPA solution flow rates and reaction temperatures to investigate the mechanism of IPA decomposition with excess water. From the results of empty-bed experiments, 20 % methanol, ethanol and 2-butanol solutions were possessed similar decomposition mechanism with 20 % IPA solution. Hence, the treatment efficiencies by combusted with oxygen carrier were supposed similar with IPA solution. The oxygen carriers with 2 kg were loaded in the fuel reactor for experiments on effects of IPA solution flow rate and reaction temperature. There were 100 % conversion of IPA and 100 % CO2 capture efficiency of effluent gas at 850 and 900°C., However, few CH4 was not decomposed at 800°C. We will fine tune the operation parameters of the fuel reactor and mechanical strength, subsequently. Besides, cooperation with industry in interest to test this reactor would be important for practical use in economy and feasibility aspects.
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