Reasons for overheating in the methanol synthesis tower

Is this also considered experience sharing? And it’s not even complete

Haha, yeah, we can also discuss any manufacturing issues that arise

Excessively high CO content; excessive pressure in the gas holder; excessively high temperature of the water supplied to the gas holder; too high space velocity and excessive venting volume; failure of the cooler at the outlet of stage 3 of the syngas compressor; this may not be an exhaustive list – I can’t remember everything; if there are any missing items, please fill them in

Reply to floor 4: An excessive air velocity does not cause overheating in the methanol synthesis tower; rather, it is a factor that makes it difficult to maintain the temperature of the tower. Other reasons for overheating in the methanol synthesis tower could include: 1) too high inlet gas temperature; 2) insufficient air velocity; 3) inadequate circulation volume of the boiler’s circulating water; 4) a smaller amount of recycled gas compared to fresh gas – this might be due to an overly wide opening in the valve allowing gas back from the synthesis gas compressor’s recycling section, or an excessive amount of vent gas, or insufficient rotation speed of the synthesis gas compressor; 5) if there is a startup heater, it could be that the valve associated with this heater isn’t closed properly, causing the gas entering the synthesis tower to pass through the startup heater; 6) the valve for cooling the gas before it enters the synthesis tower might not be open; 7) during the initial startup phase, the pressure control in the gas holder might be set too high

More commonly, it is due to improper design or equipment issues.

The methanol synthesis tower overheats – what a joke! I wonder though what type of methanol synthesis tower the original poster is using? I’ve been producing methanol for over a decade and have never heard of such an issue. If I were to analyze the cause, it would be due to improper operation, haha. In my opinion, the reasons for this kind of problem in Ruchi-type synthesis towers (the causes for other types of reactors need to be analyzed separately) are as follows: 1) Excessive temperature caused by the entry of oxygen during shutdown ； 2) During normal operation, the operating pressure of the drum is too high; it is possible that this is caused by a problem with the drum pressure transmitter ； 3) Faulty thermocouple at the outlet of the synthesis tower ； 4) Fault in the drum pressure control valve ； 5) After starting the vehicle, the steam injector for operation was not turned off.

Over-temperature due to excessive air velocity only occurs with brand-new catalysts; I failed to explain that clearly enough. Thank you for pointing it out

An excessively fast gas introduction rate into the synthesis tower can also cause overheating of the tower

Stable air intake, at a rate of 8,000 m3/h; the temperature generally does not rise during operation

You may not have seen this type of reactor; it is not of the shell-and-tube type, and overheating, temperature gradients across different sections, as well as bed branching are common occurrences.

This phenomenon occurs in adiabatic towers