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This post was last edited by wx_ on 2023-3-16 03:43,
To describe what happens based on the diagram, the first step is to determine the liquid level at position T1; only after that can steam be introduced to activate the heater. Steam is generated in the atmospheric pressure tower, and with this rising steam, mass and heat transfer can occur between the steam moving upward and the liquid flowing downward, thereby enabling distillation processes. For reference.
First, wait until the material has entered the tower before heating; do not heat it in advance. After the liquid level is observed in the tower bottom, heat slowly without rushing, and always maintain the liquid level at a constant level until all operating parameters meet the requirements.
Why is the temperature in the tower higher than that in the tower bottom?
Same question: How is it possible for the tower temperature to be higher than the kettle temperature?
Stating the process parameters and components is helpful for analysis
The temperature in the tower is higher than that at the bottom of the tower; this is probably because the feed temperature is a bit too high. When starting up, it’s necessary to first establish a liquid level at the bottom of the tower before introducing steam. Once circulation begins, the temperature at the bottom of the tower should increase somewhat
Try full reflux; it is helpful for analysis. It’s very likely that the feed temperature is high, as mentioned above – try testing with full reflux without feeding any material
This is likely a column operating under continuous distillation; it is usually started under two conditions. One is to start the column with an empty column, in which case a liquid level is established in the feed stream and the heater is activated for preheating. It is important to keep the feed flow rate low, otherwise the temperature at the bottom of the column will not rise fast enough, leading to flooding of the column or an excessive amount of unqualified product being produced. The column temperature also needs to be controlled； In another type of tower with a liquid level, the heater can be preheated first, followed by feeding the material; once the heater is in use, the temperature in the tower can be adjusted.
Set the liquid level; just increase the temperature gradually.
It’s difficult to analyze without any process parameters; this situation might be related to your feed temperature