高效立体垂直塔盘的研究与应用

发布时间：2018-08-10 20:49

【摘要】：随着国家工业技术的快速发展,对能源的依赖程度越来越高,炼油装置进行扩量改造也是大势所趋。为了降低装置的改造成本,采用高效立体垂直塔盘对装置进行扩量改造能够取得很好的经济效益。论文针对一种高效立体垂直塔盘,通过计算机软件进行数值模拟,研究了立体垂直塔盘的工作原理和帽罩内部的流动特性,在装置改造完成后对塔盘的现场使用效果进行了验证。计算分析表明,立体垂直塔盘由于帽罩的特殊结构,可明显提高气、液两相传质传热效果。气、液两相在帽罩内并流接触上升,高速气流将不稳定的液膜破碎成直径不等的液滴,气、液两相在帽罩内湍流掺混,两相混合均匀度增加,传质传热效果更好。帽罩上部的分离板使气液两相碰顶折返,与底部上来的气液两相实现互喷,加强了传质效果。与鼓泡型普通塔盘相比,气、液两相在帽罩内充分混合进行热质交换后,从帽罩壁孔水平喷射而出,在喷射罩外开始分离,气相进入上一层塔盘,液相落入下层塔板,使塔板上的液体基本上不含气泡,缩短了液体在降液管内的停留时间,使塔盘处理能力增大。通过现场应用发现,立体垂直塔盘与HTV浮阀塔盘相比,在处理量相同的情况下,传质传热效果更好,产品收率增加近40%,压降减小20%左右;在收率不变、产品质量相同的情况下,塔的处理能力增加20%左右,操作弹性增大,高达70%~120%。
[Abstract]:With the rapid development of national industrial technology, the degree of dependence on energy is becoming more and more high. In order to reduce the cost of revamping, it is possible to obtain good economic benefits by using high efficiency vertical trays to expand the equipment. In this paper, the working principle of the vertical tray and the flow characteristics inside the cap are studied by numerical simulation of a kind of high efficiency vertical tray. After the revamping of the device, the field effect of the tray was verified. The calculation and analysis show that because of the special structure of cap cover, the effect of gas and liquid two-phase heat transfer can be improved obviously. The gas and liquid two phases are in contact with each other in the cap, the unstable liquid film is broken into droplets with different diameters by high velocity gas flow, and the gas and liquid phases are turbulent mixed in the cap. The uniformity of the two phase mixing is increased, and the effect of mass transfer heat transfer is better. The separation plate in the upper part of the cap makes the gas and liquid collide with the top and spray mutually with the gas-liquid two phase up at the bottom, which enhances the mass transfer effect. Compared with the common bubbling tray, the gas and liquid phases are fully mixed in the cap cover for heat and mass exchange, then ejected horizontally from the hole of the cap wall, and separated outside the cap, the gas phase enters the upper tray, and the liquid phase falls into the lower tray. The liquid on the tray is basically free of bubbles, which shortens the residence time of the liquid in the down-flow tube and increases the processing capacity of the tray. Through the field application, it is found that compared with the HTV valve tray, the three-dimensional vertical tray has better heat transfer effect under the same treatment capacity, the product yield is increased by nearly 40 percent, the pressure drop is reduced by about 20 percent, and when the yield is constant and the product quality is the same, The processing capacity of the tower increased by about 20%, and the flexibility of operation increased, up to 70 / 120.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE962

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