排序方式: 共有12条查询结果,搜索用时 7 毫秒
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运用TEM、TPD、XRD等技术考察了烧焦温度对异构化催化剂Pd/HM再生性能的影响。结果表明:在823K时,催化剂上金属钯粒子能重新分散,催化剂恢复活性,且稳定性不变,二次再生性也较好。 相似文献
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在正常运行工况下高温气冷堆内石墨材料的氧化对石墨结构材料的服役时间有重要影响.主要介绍高温气冷堆燃料元件氦气孔道内石墨材料与水蒸气发生氧化反应的模拟.该模型使用COMSOL软件进行建模,采用k-ε模型模拟冷却剂的流动,使用Langmuir-Hinshelwood方程描述石墨与水蒸气的化学反应.使用该模型计算了冷却剂管道温度分布为线性、水蒸气压力低于1 Pa的氧化情况.计算结果表明,在堆芯底部氧化主要发生在表面,石墨材料转化率高于8%的厚度约1 mm. 相似文献
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讨论与细颗粒无烟煤焦在CFB锅炉燃烧室中停留时间有关的若干因素对燃尽的影响.指出燃烧室高度、炉膛烟气流速、分离器效率和飞灰回燃等是影响福建无烟煤在CFB锅炉中燃尽的重要因素.提高炉膛燃烧室高度、适当降低炉膛烟气流速、提高分离器分离效率、采用飞灰回燃等措施能有效地延长福建无烟煤细颗粒在CFB锅炉燃烧室中的停留时间,从而有利于福建无烟煤的燃尽. 相似文献
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高浓度有机废液的燃烧特性和动力学参数研究 总被引:2,自引:0,他引:2
研究了高浓度有机废液和混煤废液的燃烧特性和动力学参数,考察其着火特性、燃烧燃尽特性、动力学参数以及燃烧特性对有机废液焚烧炉设计、运行等的影响.研究表明:高浓度有机废液粘度低,具有良好的雾化特性;其热值较低,使得着火温度较高;混煤有机废液较原有机废液易着火,且燃烧稳定、良好,燃尽时间也较短. 相似文献
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Kinetics of carbon oxide evolution in temperature-programmed oxidation of carbonaceous laydown deposited on wet oxidation catalysts 总被引:1,自引:0,他引:1
The combustion kinetics of coke laydown on wet oxidation catalysts was studied by means of temperature-programmed oxidation and mass spectrometry within the temperature range (30–600°C). The coke deposits were formed over three different catalysts 1 wt.% Pt/Al2O3, MnO2/CeO2 and 1 wt.% Pt–MnO2/CeO2 during phenol deep oxidation in a three-phase slurry reactor at various reaction conditions (exposure time, temperature, oxygen pressure, catalyst loading). The carbon oxides, oxygen and water fluxes arising from the combustion of the carbonaceous deposits in a 5% O2/He mixture, were continuously monitored. In all cases, unimodal quasi-Gaussian distributions were obtained for CO2 while no CO was detected. These evolutions were successfully described by a modified “fractal power-law” grain model. The coke-dependence of the carbon dioxide profiles was related to the fractal dimension of the catalyst surface and to the oxygen partial order during coke burn-off. The corresponding change in O2 partial order was ascribed to competition between three steps in the combustion mechanism: non-dissociative O2 chemisorption, interaction of oxygen with undissociated dioxygen bearing surface species, physical desorption of the complex oxide as carbon dioxide. 相似文献
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