Stabilizer top temperature control method
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Why is the top temperature of the stabilizer in a light hydrocarbon recovery unit controlled using a flow single-loop control system, rather than a temperature single-loop control system or a temperature-flow cascade control system?
It is estimated that stabilizing the reflux ratio can better regulate the gas-liquid equilibrium in the tower; using temperature leads to too large fluctuations. Personal opinion
This will give better results; I’m not exactly sure about the details, as I just follow other requirements
What do you mean by a single-loop temperature control system? Is there equipment for direct heating at the top of the tower? At the top of the tower, temperature and pressure are generally the parameters that need to be controlled, and this is done by adjusting the heat exchange area of the reflux or condenser. The fact that you mention using reflux directly to make adjustments indicates that the control point lies at the top of the tower: a larger reflux amount results in a higher composition, while a smaller reflux amount leads to a lower composition. When pressure remains stable, temperature and composition are also fixed; by controlling the temperature, the composition can be determined.