What happens if pressure is not relieved after the synthesis tower is shut down?

Short-term parking does not require pressure relief, but long-term parking does; this has an impact on the catalyst’s activity.

If it’s only stopped for a few hours, the lack of pressure release has little impact. If the process stops for an extended period, and the temperature of the synthesis tower drops to a certain level, the organic substances remaining in the tower (especially certain higher alkanes) will gradually accumulate on the surface of the catalyst, thereby affecting its activity.

The hydrogen content in syngas is very high; after shutdown, the majority of components in the syngas are H2, which **increases the likelihood of hydrogen embrittlement and causes significant damage to the equipment**. It can also cause damage to the catalyst.

It is acceptable not to release pressure for a short period of time, but the valve that supplies fresh gas to the synthesis tower must not leak internally. If medium-pressure nitrogen is available, it is advisable to consider using it for purging

First, the CO displacement reaction within the system must be completely eliminated to ensure that no further reactions occur; this allows for a short shutdown without the need to release pressure. However, during a long-term shutdown, pressure release is necessary

I’ve learned it, thank you. I need to keep studying hard in the future*

If pressure is not released after stopping, when driving again the pressure difference between the primary seal of the dry gas seal and the buffer is too small, failing to meet the conditions for starting the machine. Those equipped with a booster pump still fail to meet the requirements.

1. If the pressure is not released during long-term parking, it becomes difficult to control the temperature of the synthetic catalyst bed. During the period of pressure retention, the temperature inevitably drops. A temperature of 190 degrees is optimal for the formation of liquid wax; this liquid wax then adheres to the surface of the catalyst, having a severe impact on its activity and service life. 2. Prolonged parking is also detrimental to the synthesis furnace, as it can lead to a situation of suffocation inside the furnace; at this time, CO causes carbyl corrosion to the equipment. 3. In the case of long-term parking, the synthesis tower should be depressurized to maintain a pressure of around 0.5 MPa. The following precautions should be observed during depressurization: (1) During the depressurization process, the rate of pressure reduction should be 0.5 MPA/h; the catalyst’s activity must not be affected. (2) Displacement: It is required that during the displacement process, the synthesis tower contain CO+H2

If you don’t relieve the pressure, your power equipment won’t be able to start; the cycle cannot be established, and it’s impossible to operate the equipment

If the pressure is not released after parking, the gas flow in the system stops; the reducing gases remain trapped with very high partial pressures, which can cause the catalyst to sinter and affect its activity once operation resumes.