【作者】 哈莹；

【导师】 廉景燕；

【作者基本信息】 天津理工大学 ， 化学工艺， 2012， 硕士

【摘要】 本文围绕利用流态化浸取技术处理高浓度石油污染土壤展开讨论。以浸取流化床设备为研究对象，以水、土分别代替浸取剂和石油污染土壤进行冷漠试验，运用正交化方法对各试验因素经行设计，采用FLUENT流体力学模拟软件作为试验手段模拟浸取流化床内部流场，为流态化浸取设备的热模试验提供理论上的数据与支持。浸取流化床的结构直接影响其内部流态化浸取效果，通过对错流浸取流化床与现有逆流浸取流化床内部流场的放大模拟、比较及分析，错流浸取流化床存在局部流化速度过高，出口夹带量较大，泥浆大量流入进水口等问题，且无法通过调整初始操作条件进行改善，因此，本文选择流态化效果较好的逆流浸取流化床作为流态化浸取设备，其结构设计参数来源于现有小型逆流浸取流化床，各操作参数范围则可由广义流态化公式进行估算。现有的逆流浸取流化床结构设计虽较为合理，但其在进行流态化操作的过程中也存在着一些问题，如：进料扩大段对浆料的浓密作用不大，出水溢流不顺利等，尤其在进料土壤为40目的情况下体现较为明显。在出口处加装溢流堰，不仅使这些问题得到改善，而且使土壤颗粒在流态化浸取段分布更加均匀。通过对以上各实验方案的研究表明，带有溢流堰的逆流浸取流化床流态化效果较佳，且具有进一步优化的潜力和空间，其各项试验数据可以作为后期优化设计的有利依据。更多还原

【Abstract】 The article mainly introduced the research on the treating high concentrated of petroleumcontaminated soil by fluidized leaching technology. Experimental program were designed byorthogonal experiment assistant. FLUENT was adopted as the test means to simulate theinternal flow field of leaching fluidized bed. Instead of the leaching agent and oilcontaminated soil,the cold model test of the leaching fluidized bed equipment used water andsoil as the material, which can provide the theoretical data to the thermal model test.The structure of the leaching fluidized bed affects its internal operating result directly.Compared with the available countercurrent leaching fluidized bed, The cross-flow leachingfluidized bed had the problem that the partial fluidization velocity of mud was so high that alarge amount of which outflowed from the outlet, or flowed into the water inlet. And it cannot be improved by adjusting the initial operating conditions. Therefore, the countercurrentleaching fluidized bed whose structural design parameters derived from the existingsmall-scale countercurrent leaching fluidized bed was chose as the trial equipment, and therange of operating parameters can be estimated by the generalized fluidization formula.The design of the available countercurrent leaching fluidized bed was quite reasonable,but there were some problems in the process of fluidization, for instance, the expansionsection of the equipment densed slurry of little use, and water overflow was not smooth, andso on, especially in the case of feeding the40mesh soil. Installation of an overflow weir atthe outlet, not only to bring these issues to be improved and more uniform distribution of soilparticles in the fluidized leaching segment.Through comprehensive comparison of the above options,the effect of the countercurrentleaching fluidized bed with the overflow weir was better, and has the potential to furtheroptimize space, and its test data can be used as post-optimization design favorablebasis.更多还原