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xinyi8853(金币+100, 翻译EPI+1): 2010-04-15 10:58
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As shown in Fig. 1, ASR can pyrolysis, gasify and combust in different atmospheres. The final weight-loss ratio increases with increasing level of oxygen flowed into the atmospheres’, which indicates that the more the oxygen is flowed into the reaction gas the more thoroughly the reaction proceeds. As the oxygen content increases, the final weight-loss ratio of ASR declines from 43.4% to 10.1. The weight-loss ratio of ASR in N2 gas is 43.4% and the separation volatile percentage composition is 56.6%, which is similar to the volatile matter of ASR in proximate analysis (shown in table 1, the value is 52.71%). The process of ASR pyrolysis and gasify can be described as follows. There is slight weight-loss when the temperature is below 200℃, which mainly due to the water separation in ASR. Although ASR is complicatedly composed and the pyrolysis and gasify of its each component are obviously different, each component begins to separate volatile matter, which mainly consists gaseous hydrocarbons, CO, CO2, H2 and so on. When oxygen exists and the temperature is enough, volatile matters can carry on the gasify combustion reactor. As is shown in the curve of TG under the N2 circumstances, the volatile matter separated when temperature ranged from 250-550℃ and the residual semi coke begins to decompose to create asphaltum oil and gas under this temperature. From then on, the residual carbon created in the process of ASR decompose begins to react with oxygen and water to create gases, such as CO、CO2、H2、CH4 and so on. And the whole gasification is finished when the temperature reaches approximately 720℃. |
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