DMCplus控制器的主要候选应用是高体积单元，如原油精馏单元。在这些单元中比例因子较大，一个小的操作改善将会带来非常显著的经济效益。
变换单元如猫饼干厂与加氢裂化等也是不错的DMCplus控制器候选应用。由于这些单元是将低价值原料转换为高价值产品，存在显著提高产量和盈利能力的潜力。
DMCplus控制器的第三候选应用是生产高价值产品的单元。即使其是小体积单元，增加产品回收率的效益也是非常显著的。许多特种化学品应用属于这一类。
DMCplus控制器的第四候选应用是高消耗的单元。许多串联精馏属于这一类。产品通常被过度纯化从而使得干扰影响不至于导致产品不合格。通过实施DMCplus控制，干扰影响可以被部分抵消，产品可以控制地更接近指标（卡边控制）从而节省能源。
DMCplus控制器的第五候选应用是受到频繁干扰的单元。前面提到的Pre-frac塔就是此类应用的一个典型例子。实施控制器单元的稳定操作可能并不具有有形的效益，但下游单元的盈利能力得到显著的改善。由于进料更加稳定，约束可以更好地被推向边界。
DMCplus控制器的最后一组候选应用是包含实时优化(RTO)应用的单元。RTO范围涵盖了整个工艺单元，而不仅仅是单元中的某一台设备(DMCplus)。RTO计算整个工艺单元角度的最优稳态工作点，而DMCplus稳态求解器只能优化控制器覆盖（通常不是整个工艺单元）的设备。
为了实施RTO解决方案，就必须有一个在同时存在多项约束条件下能控制高度耦合多变量过程的控制方案;
DMCplus是天作之合。一个典型的RTO应用程序将向几个DMCplus控制器中写入设定值。这些控制器需要拥有快速驱动过程到新的最佳操作点并在面对干扰的情况下保持稳定的能力。
附原文：
The primary candidates for DMCplus control are high volume units, such as Crude Distilling Units. In these units, the scale factor works for the benefits, so that a small improvement in operation results in a very significant economic benefit.
Conversion units, such as Cat Crackers and Hydrocrackers, are also good candidates for DMCplus control. Since these units are converting a less valuable feed to higher valued products, the potential exists to significantly improve yield and profitability.
A third group of candidates for DMCplus control are units that produce a highly valued product(s). Evenif the unit is a low volume unit, the benefits can be quite significant for increased product recovery. Many specialty chemicals applications fall underthis group.
A fourth group of candidates for DMCplus control are units with a high consumption of utilities. Many fractionation trains fall under this group.The products are over-purified so that the effects of disturbances do not cause the products to go off-specification. By implementing DMCplus control, the effect of the disturbances can be accounted for, with products controlled closer to specification which saves energy.
A fifth group of candidates for DMCpluscontrol areunits that are subject to frequent disturbances.The Pre-frac Tower mentioned previously provides aprime example of this type of application. Stabilizing the operation of the unit may not have tangible benefits at the point where the controller is implemented, but the profitability of the downstream units is generally improved. Constraints can be pushed more closely since the feed is more stable.
A final group of candidates for DMCplus control are units where Real Time Optimization (RTO) is to be applied. The scope of RTO covers the entire process unit, and not just certain pieces of equipment in the unit (DMCplus). RTO calculates a steady-state operating point that is optimal from the standpoint of the entire process unit, while the DMCplus steady-state solver can only optimize the equipment covered by the controller (typically not the entire process unit).
In order to implement RTO solutions,it is necessary to have a control scheme that controls highly interactive multivariable processes at several constraints simultaneously; DMCplus is a natural fit.A typical RTO application writes setpoints to several DMCplus controllers. These controllers are required to take the process quickly to the new optimal operating point, and hold it there in the face of disturbances.
2015.9.13
