Positions of temperature points on the distillation tower
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Question: For a plate distillation column, should the thermometer be placed in the downcomer area or the tray area, and is it used to measure the temperature of the gas phase or the liquid phase? Is there any difference between the three temperatures?
It is generally installed inside the downcomer, so as not to interfere with the flow of liquid on the tray; thus, the temperature measured is naturally that of the liquid.
At the top of the tower, the temperature of the gas phase is measured, while on the tray levels, it is usually the liquid phase whose temperature is measured, as the measurement of the liquid phase temperature is more accurate
That can’t be right! ? What is measured is definitely the temperature of the gas phase. The first liquid layer is unstable, making it difficult to ensure that the temperature measurement point remains within the liquid layer ； Second, the liquid phase temperature does not change as rapidly as in the gas phase reaction. Sensitive
Reply to 5# wdh2010: The design involves making openings in the tower wall where the arc-shaped downcomer is located; the center of these openings is parallel to the straight edges of the arc. The thermal resistor is inserted through these openings. Since there is always a liquid level inside the downcomer (created by the pressure difference between two adjacent plates), the thermal resistor remains submerged in the liquid at all times. This is the best position. Oh oh
Perhaps the industries are different; we don’t measure the temperature of the liquid phase – we only measure the temperature of the gas phase； If the temperature of the liquid phase is measured, it should be lower than that of the gas phase; after all, the temperature of the rising steam on the same tray is higher than that of the liquid phase