How to increase the inlet temperature of the synthesis tower
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Wax formation during synthesis is extremely severe; the filter remains constantly clogged. It is now suspected that the inlet temperature is too low, at 170 degrees. But the inlet temperature just won’t go up no matter what. I would appreciate it if you could advise me on how to increase it
If there is a bypass valve for the inlet to the tower, it can be opened slightly to reduce the amount of cold air flowing into the preheater inside the tower; this also helps to increase the temperature of the gas exiting the tower
Are you using the compressor from there in front of your synthesis tower?
The compressor’s cooler can be turned down a bit, as long as this does not affect the compressor’s operation.
I guess all the cold lines have been turned off, right? After turning off the cold lines, the only option left is to increase the outlet temperature. The circulation pumps are usually also turned off for the secondary lines, so there isn’t much room for adjustment. . . . If it’s not possible to lift it, it’s likely a hardware issue, and that’s really hard to fix. Wax formation isn’t necessarily due to a low inlet temperature, right?
What is the temperature after water cooling? Can it be increased a bit more?； If there is a cooler for the compressor’s return flow, reduce the circulation water flow as well. If there’s really no other way, just endure it. Try not to increase the temperature by raising the pressure in the air pocket.
Reduce the air velocity and increase the outlet temperature of the recycle gas appropriately; in some units, the bypass in the gas inlet heat exchanger can be turned off.
1. Increase the exit temperature of the synthesis tower. 2. Increase the outlet temperature of the syngas compressor. 3. Increase the temperature of the recycle gas. 4. Increase the area of the heat exchanger inside the tower. 5. Add an electric furnace for heating on the pipeline leading to the tower.
Reduce the space velocity and increase the reaction time. If there is a bypass line to the tower, reduce its flow as much as possible. Increase the drum pressure. ·······
Generally, the inlet temperature is increased by raising the exit temperature of the synthesis tower. If the exit temperature is normal but the inlet temperature is too low, the main reasons are likely: A) insufficient heat exchange area in the intermediate heat exchanger used to preheat the gas entering the tower; B) low temperature of the feed gas. Raising the temperature of the fresh gas to a normal level, as well as increasing the cooling water flow in the anti-surge cooler of the recycle compressor, can help raise the exit temperature. Furthermore, severe wax formation is mainly due to the presence of iron, nickel, and similar elements in the system; otherwise, even at low inlet temperatures, not much wax will form. It deserves attention! :handshake
May I ask: Which factory do you work for? What type of tower is being used? What are the synthesis outlet temperature and bed hotspot?