润滑油白土精制装置控制系统设计论文.docVIP

润滑油白土精制装置控制系统设计 摘 要 润滑油料经过溶剂精制、溶剂脱蜡或化学药剂精制后，质量已基本达到要求，但其组成中仍残留有少量的溶剂及一些有害物质。这些物质的存在，就会影响油品的颜色、安定性、抗乳化性等性能，为此还必须再经过一次精制，除去有害物质，以改善上述性能，才能得到合格的润滑油。所以润滑油最后一次精制也很重要。在本文中，对润滑油的精制采用的是传统的白土精制方法，运用PLC控制技术对整个系统进行控制，以最低的成本达到更佳的精制效果。 润滑油白土精制过程中，需要控制的部分很多，而在本文设计中，主要对三个设备进行了控制方案设计。1.润滑油和白土进料量的比值控制系统设计。这里采用了变比值控制方案，通过变比值控制器来控制润滑油量和白土量的比例。2.白土加热炉的温度控制系统设计。在这个方案设计中，我采用串级PID控制方案，把压力和温度量进行串级，达到更好的控制效果。3.油水分离罐的液位控制设计，设计中采用单闭环控制方案对液位进行控制。 本文还对PID控制器进行了控制算法设计。在控制系统选型中选用了三菱FX2N系列PLC控制设备对整个系统进行控制，PLC控制技术能较好的控制系统的安全稳定运行，并且以最合适的成本达到最佳的控制效果。最后对系统中用到的仪表进行了选型并对整个系统做了预算。 关键词：润滑油；白土精制；变比值控制； Control System Design of Clay Refining for Lubricating Oil Abstract Lubricating oil was refined by solvent, solvent de-waxing or chemical refining, the quality has been basically meet the requirements, but its composition is still a small amount of residual solvent and a number of harmful substances. The existence of these substances will affect the oils color, stability, resistance properties such as emulsification. This must also go through a purification to remove harmful substances to improve the performance of lubricating oil. Therefore, the last time oil refining are also important. In this article, the way of the refined oil is used in traditional clay refining methods, using PLC control technology to control the whole system in order to achieve better results at the lowest cost. At the process of oil which is refined by clay, there are many parts to control, and in this design, there are the design of three main devices. 1. Lubricating oil and the ratio of clay Feed rate control system. Here control scheme is used by a variable ratio controller to control through the oil volume and the ratio of clay content. 2. Clay furnace temperature control system. In this design, I use cascade PID control scheme, the amount of pressure and temperature were cascaded to achieve better control results. 3. Oil-water separation tank liquid level control design, the design of a single closed-loop control scheme