How are the steam pressures for stripping and regeneration in the reboiler selected? ? ?
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Our plant currently uses low-pressure water at 0.35 MPA for regeneration, and low-pressure steam at 1.0 MPA for stripping, but we don’t know why this choice was made! Let’s discuss the reasons?
First, consider the heat transfer temperature difference of the reboiler; second, consider whether the medium at the bottom of the tower will deteriorate due to high-temperature heating.
That’s too general. Could you be more specific? Furthermore, both of these towers have a bottom temperature of 122 degrees, but two different steam pressures are used
For stripping, a steam temperature of 0.35 is too low; therefore, 1.0 is used for heating； For regeneration, a steam temperature of 1.0 is too high and can cause the decomposition of N-methyldiethanolamine; 0.35 saturated steam is better
At 1.0 MPa, the steam temperature is around 180 degrees; this temperature is too high, as MDEA decomposes and becomes inactive at such temperatures
Regeneration requires a bottom temperature of around 123°C, while the bottom of the stripping tower needs 160°C; therefore, different types of steam must be used
It mainly depends on what temperature is required to meet production needs; hydrogen sulfide in water requires 158°C. . Solvent hydrogen sulfide requires 130°C; whichever steam meets the conditions is used.
4louder’s explanation is already very comprehensive
Our plant features single-tower full extraction, with a stripping pressure of 0.45 and a regeneration pressure of 0.35
The pressure of the steam determines its temperature, and the specific type of steam to be used depends on the physical and chemical properties of the medium.