If the liquid feed rate drops suddenly, how do the parameters related to the distillation column change?
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Let’s first give a brief overview of the control system for this distillation tower. The steam flow rate to the thermal siphon reboiler at the bottom of the distillation tower is under automatic control, with its level being manually adjusted according to the load； The tower bottom liquid level is automatically controlled by a control valve ； The feed is a saturated liquid phase feed ； The pressure at the bottom of the tower is automatically controlled by the flow rate of the cooling water in the top condenser, while the product at the top of the tower is regulated by a sensitive plate located in the stripping section. I would like to ask the experts here a question: if the feed rate suddenly decreases while the steam supply remains unchanged, how will the opening degree of the control valve for the cooling water flow rate, which is used to regulate the pressure at the bottom of the tower, change? How does the value of the tower bottom pressure change? How does the temperature of the sensitive plate at the top of the control tower change?
The control valve for regulating the flow rate of the cooling water, which is used to control the pressure at the bottom of the tower, is opened wider; as a result, the pressure at the bottom of the tower increases, and this in turn raises the temperature of the sensor plate that controls the product at the top of the tower.
Are you sure you can keep track of all those automatically operated valves?