共查询到19条相似文献,搜索用时 78 毫秒
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本文研究了“活性炭吸附+催化燃烧”工艺在挥发性有机化合物(VOCs)治理中的联合应用,以提高现代化工废气处理系统的效率和环保性能。首先,详细介绍了该工艺的基本原理,包括活性炭吸附、脱附和催化燃烧的机理,以及影响催化燃烧反应的主要因素。随后,阐述了活性炭废气处理系统的主要处理工序与原理,包括废气的捕集、多级过滤、活性炭吸附和催化燃烧等阶段。在活性炭吸附+催化燃烧系统方案中,系统通过多级过滤确保废气在进入设备前达到清洁无害的标准。活性炭在吸附阶段通过其巨大表面积和微孔结构有效吸附废气中的有机物,将其转化为对人体无害的气体。随着活性炭吸附的饱和,通过吹扫干热空气进行脱附再生,维持活性炭床的吸附能力。脱附后的废气进入催化燃烧装置,在催化剂的作用下高效氧化燃烧,将有机物完全分解为水和二氧化碳。系统设计中,燃烧产生的热量被用于加热活性炭吸附系统和预处理废气,提高整个系统的能源利用率。 相似文献
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简单介绍了一些常见分子筛的构型及特点,讨论了不同构型分子筛对各种VOCs废气吸附效果的研究进展。总结了各类分子筛对VOCs的吸附特性,发现立方构型的分子筛对VOCs废气的吸附效果最佳。小结了影响分子筛吸附性能的因素,发现分子筛的比表面积、孔容、硅铝比、表面官能团等自身性质都会对吸附VOCs废气的性能产生一定的影响。另外,分子筛的吸附容量还与吸附时的进气流速、入口气体浓度、吸附剂床层高度等工况有关。最后,对现有研究做了总结与展望,为分子筛吸附VOCs的合理应用提供了理论支持。 相似文献
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活性炭纤维吸附甲苯废气的中试研究 总被引:7,自引:0,他引:7
介绍了活性炭纤维吸附甲苯废气试验的装置和流程,并记录了吸、脱附试验的数据。经该工艺处理后的甲苯废气可达标排放,并且运用热风反吹吸附后的装置可达到解吸目的。 相似文献
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挥发性有机化合物(VOCs)是一类重要的大气污染物,其所带来的环境污染问题已经引起全世界的关注.活性炭吸附法是治理VOCs污染的有效手段.本文从介绍VOCs治理技术出发,简述了活性炭吸附法在VOCs治理中的使用现状,概括了活性炭吸附法治理VOCs的工艺技术和存在问题,指出变温-变压吸附、变电吸附以其高效节能环保的优点,在VOCs治理中具有较好的发展前景.分析了活性炭表面化学性质、吸附质的物性、操作条件对活性炭吸附法治理VOCs的影响,为VOCs治理专用活性炭的改进和新产品的开发,提供了理论依据.在总结现有研究进展的基础上,预测了活性炭吸附法治理VOCs技术的发展趋势,提出对工艺的改进以及与其他VOCs废气处理技术的耦合使用,针对不同VOCs排放场所开发不同活性炭品种和VOCs回收装置将是以后研究的重要方向. 相似文献
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Yadong Li Yuanhui Shen Zhaoyang Niu Junpeng Tian Donghui Zhang Zhongli Tang Wenbin Li 《中国化学工程学报》2023,53(1):346-360
In order to better guide the design of industrial process for purification and recovery of VOCs, temperature swing adsorption (TSA) and temperature vacuum swing adsorption (TVSA) process for VOCs purification and recovery were studied systematically with activated carbon adsorbent. The adsorption and desorption behaviors of benzene on activated carbon in above two processes were investigated systematically. Effects of operating parameters on process performances were further analyzed, including as regeneration temperature, purging feed ratio and hot–cold purging ratio. The results showed that the increase of hot–cold purging ratio (HP/CP) could obtain the same regeneration effect as the increase of desorption temperature. Increasing the feed purge ratio without increasing the hot–cold purging ratio is not conducive to bed regeneration, because a large number of cold purge gases cannot utilize the residual heat of temperature wave, thus reducing the desorption effect of the cooling step on the bed. In addition, the vacuum step can enhance the regeneration ability of hot nitrogen to the bed at the same regeneration temperature, making the bed regeneration of TVSA process more thorough. Temperature in the middle and lower part of the bed in TVSA process was higher and the regeneration was more thorough. In conclusion, TVSA has more obvious advantages than TSA in terms of energy consumption, hot or cold purge volume and bed regeneration. 相似文献
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Roberto Leyva-Ramos 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1989,45(3):231-240
Adsorption of an anionic detergent (sodium dodecyl benzene sulfonate) from aqueous solutions onto activated carbon is investigated as an alternative for eliminating detergents from wastewaters. The adsorption isotherm was measured experimentally at 25°C, 30°C and 35°C and the experimental data were correlated reasonably well by the adsorption isotherm of Prausnitz-Radke. The adsorption capacity is considerably affected by pH and there exists an optimal pH, near pH = 7, where the maximum adsorption takes place. The adsorption capacity increases with rising temperature, the adsorption is irreversible and the heat of adsorption is lessened with the amount of detergent adsorbed and its order of magnitude corresponds to a chemical reaction. It is concluded that the detergent is chemically adsorbed onto the activated carbon. 相似文献
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