Catalytic stabilizer pressure
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Every time operations start, the pressure in the stabilizer tower becomes excessively high. During the heating process, it is the distillation tower that sees an increase in pressure first, and it’s inevitable that the stabilizer tower will experience overpressure as well
What is the heat source at the bottom of the stabilizer tower, OP? Is it caused by the temperature rising too quickly? It is still the case that the temperature at the bottom of the distillation column did not rise sufficiently, resulting in an excessively high C2 content and causing overpressure in the stabilizer column. If nothing else works, you can install a gas system in the reflux tank!!!
The reasons are as follows: 1. Primarily, when the stripping column is started up, the heating rate is slow, resulting in incomplete removal of ethane, which leads to a high ethane content in the stabilizing column； ⒉The steam supply at the bottom of the stabilizer tower is too rapid ； ⒊The pressure control adjustment at the top of the stabilizer tower is not timely.
Could we draw on the operating principle of gas flow: if the product quality from the upper column is unsatisfactory, no feed should be sent to the lower column? Of course, the requirements for stability during absorption are not so strict; everyone wants to speed up the adjustment process at the start of operation in order to produce qualified products as soon as possible. In the situation you mentioned, one thing is to ensure proper control of the operation of the rectification tower, and another is to avoid increasing the temperature at the bottom of the stabilizer too rapidly. Our unit uses the middle stage of distillation as a heat source; therefore, at the start of operation, distillation is initiated first. To prevent the distillation process from heating up too slowly, not too much heat is drawn from it at the beginning. As a result, the pace of starting up in a stable manner is quite good. In LZ’s case, this situation only lasts for a short time
It is possible that the desorption tower did not complete desorption properly at the beginning, and the stabilization tower heated up rapidly, resulting in an increase in non-condensable gases in the stabilization tower and thus overpressure. During the three-tower cycle, the light components in the stabilizer tower are already abundant; therefore, the temperature must be increased slowly. At the same time, the amount of absorbent added should be increased, as well as the desorption load, which is usually high. This can reduce the load on the stabilizer tower.
Your question is exactly the opposite of ours. When we start up, we always increase the pressure in the stabilizer gradually, and we do not put the condenser at the top of that tower into use right away; instead, we wait until the pressure rises before activating it. Your problem might be that the resolution of the separation tower is not sufficient, resulting in too much C2 being carried over to the stabilizer tower. It is recommended that you ensure proper separation efficiency at the start of operation; once the pressure in the stabilizer tower increases, you can put the top cooler of the stabilizer tower into use earlier
The analysis is insufficient; too much C2 volatilizes during heating, causing the stabilizer column to heat up too rapidly
It’s probably because the temperature of the decomposition tower is rising too slowly
It’s probably because the parsing isn’t thorough enough; we haven’t encountered this issue here
During the three-column cycle, there are many light components in the stabilizer column; as a result, the absorbent cannot be pumped in sufficiently, and the temperature at the bottom of the column rises – otherwise it’s difficult to pump enough absorbent in. ???
This problem is inevitable every time work starts or during long periods of cutting! First, appropriately reduce the absorption pressure! Ensures good desorption! Do not put a load on the stabilizer tower! Second, control the absorbed dose so that it isn’t too high! Guaranteed to not absorb too much! Do not put a burden on the desorption tower! Third, open the non-condensable gas valve and send it to the separator at the compressor outlet! Fourth, send the non-condensable gas to the flare!
It is likely that the decompression and parsing tower failed to perform proper parsing at the beginning; the stabilizer heated up rapidly, resulting in an increase in non-condensable gases in the stabilizer and thus overpressure.
The decompression and analysis tower fails to perform proper analysis at the beginning, either because the temperature of the stabilization tower rises too quickly or due to insufficient skill and inadequate operational expertise