To ensure the quality of products i

To ensure the quality of products is the ultimate goal of distillation, so in addition to the temperature control scheme and pressure control scheme, we need to make a brief analysis on how to control the product quality.In general, when designing the product quality plan, the staff need to make clear four important parameters that affect the product quality, that is, distillate volume, reflux flow rate, kettle liquid volume and steam volume. On the basis of defining the four main parameters, one of the four important parameters is used as a means to control the product quality according to the specific product quality requirements, and the other two parameters are controlled by liquid level. After the parameters are determined scientifically, according to the actual recovery position of the product, the corresponding control scheme is selected between the distillation section control scheme and the distillation section control scheme, so as to realize the effective control of the product quality. In the two specific control schemes, the distillation section control scheme improves the dynamic response of the system through the temperature flow cascade control, and ensures the stability of the system. It has the advantages of stable operation, high sensitivity and strong reliability. The control scheme of the stripping section is to use the steam volume as the control variable to effectively control the interference of the stripping section and ensure the quality of the products at the bottom of the tower.