High vapor return temperature in the reboiler
Thread Content
In the solvent regeneration reboiler, the temperature of the vapor returning to the tower is higher than the temperature at the bottom of the tower (temperature of vapor returning to tower: 126°C, temperature at bottom of tower: 119°C). However, raising the liquid level at the bottom of the tower to over 70% resolves this issue. What is the cause of this?
Once the liquid level at the bottom of the tower increases, the hydrostatic head of the liquid available in the tower bottom increases as well. This leads to an increased driving force for circulation in the reboiler, and consequently the circulation rate rises. Under the same heat load, the vaporization rate of the material returning to the tower from the reboiler outlet decreases, which in turn results in a lower temperature. However, the temperature of the material returning to the tower at the reboiler outlet is still slightly higher than the temperature at the tower bottom.
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Thank you! But it seems there are issues with the operation, such as: the pressing force and temperature not being high enough