Temperature difference control issue in distillation towers
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I would like to ask everyone: is the temperature difference displayed for a distillation column simply the difference between the temperatures of the two trays? On our DCS, the temperature at layer 26 is shown as 105°C, while the temperature at layer 10 is 100°C; however, the temperature difference indicated is 6°C. By checking the PID diagram, it can be seen that the temperature difference is supposed to be calculated based on the temperatures from layers 26 and 10. Why is this the case?
It could be due to errors or precision issues, or perhaps the positions of the measurement points are slightly different
It’s just an error, right? It’s not that different either!
Everything has errors; don’t worry about it. refractory bricks
Is your temperature reading displayed without decimals? Is it possible that this is because the temperature at layer 26 is 105.4°C, while it’s 99.6°C at layer 10, with a difference of 5.8°C, or around 6°C?
Is your distillation column a benzene column? Here we also control the temperature difference between the 26th and 16th trays; we adjust the temperature of those sensitive trays to be in the range of 100–120, with the temperature difference itself being between 1.8 and 4. Do you have cascade control for the temperature difference there?