How to control the temperature of the absorption tower

The temperature of the adsorption tower is determined by the temperature of the inlet gas

Our catalytic unit’s absorption tower features mid-stage reflux; we control the temperature by first regulating the temperature of the rich gas entering the tower, and secondly by using the mid-stage reflux to lower the temperature of the tower

1. Adjust the flow rate and temperature of the absorbent (rough steam and stabilized steam). 2. Improve the inlet temperature of the rich gas, paying attention to the cooling effect； 3. Adjust the mid-section return flow rate of the absorption tower ；

The last edit to this post was made by Simple and unadorned on 2009-7-7 at 21:42. Regarding what was said on floor 4, I think it’s not enough to adjust only the temperature of the rich gas inlet; it is also necessary to maintain an appropriate temperature for the compressed rich gas in order to ensure that the absorption tower can operate under conditions of low temperature and high pressure

In principle, the lower the temperature in the absorption tower, the better. However, taking into account the stripping load and overall energy consumption, the top temperature of the absorption tower is generally between 40–45 degrees, while the bottom temperature is between 45–50 degrees. If the temperature in the absorption tower becomes too high, the following measures can be taken: 1. Adjust the absorption dose and temperature; 2. Adjust the flow rate and temperature of the intermediate stream; 3. Reduce the amount of material used for stripping; 4. Decrease the processing volume; 5. Pay attention to the temperature of the compressed rich gas after cooling

What was said upstairs is absolutely correct; thumbs up. But it’s better to apply it specifically to one’s own device.

A low temperature in the absorption tower facilitates absorption; the main influencing factors include: 1. The amount of crude gasoline and its temperature after cooling； 2. Supplementary absorbed dose and temperature after cooling ； 3. Heat extraction from the middle section ； 4. Temperature of the feed gas at the bottom of the tower. It is mainly adjusted by improving the cooling efficiency of each cooler.

It is generally controlled based on the absorption effect, with the temperature usually ranging between 30 and 40 degrees; if it is too low, excessive absorption occurs, while if it is too high, components above C3 cannot be absorbed

Why is the temperature at the bottom of the tower always lower than that at the top of the tower when using ASPEN for simulation?

For the control of the temperature at the top of the absorption tower, you need to take all material-related factors into account: 1. Absorbent: usually crude gasoline. So the temperature of the overhead gas separation vessel in the fractionation tower. That is, the temperature and flow rate of crude gasoline. 2. Rich gas temperature: 2.1 The temperature and flow rate of the rich gas in the separator at the top of the distillation tower; 2.2 The temperature of the rich gas at the outlet of the compressor. 2.3 Cooling effect of the rich gas cooler in the absorption system. 3. Washing water. If the absorption stabilization system has wash water, the temperature and flow rate of this wash water also affect the temperature of absorption and desorption. 4. Temperature and flow rate of the supplementary absorbent; 5. Heat extraction from the middle section of the absorption tower. 6. Desorbed gas flow rate and temperature. Related to the operation of the desorption tower, excessive desorption can also cause an increase in the absorption temperature. 7. Circulating water temperature and pressure.