distillation
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What does \"complex control for low selection in distillation\" mean?
Could you explain it in more detail? I don’t understand what concept you’re referring to
That is, select based on low level, flow rate, or pressure
This relates to instrument interlocks; typically, two or more signals are used to control a mechanism such as a valve. Under normal conditions, a certain operating parameter controls the operation of the mechanism, while in abnormal situations, another signal takes over control. Low selection or high selection is the choice of the controller’s output signal. For example, in acrylic or ammonia coolers used in purification systems, selective control is generally employed; the two control signals are level and temperature. Under normal conditions, control is carried out by the temperature controller, while in abnormal situations (when the liquid level is too high), control is switched to the level controller.
You mean the switch for selecting the controller, right? For low-level control, it mainly depends on the requirements imposed by your process parameters; if a high level of precision is required for the liquid level, then using a level controller is the appropriate choice. If it’s necessary to ensure proper feeding to the subsequent processing stages, then a flow controller should be used for control. Alternatively, automatic selection can be employed: when a certain process parameter drops to a specific value, an automatic controller is activated to ensure that this parameter does not drop too low, thereby preventing shutdowns.