Handling method for poor methanol pump tripping
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Why: For the situation where the methanol-poor pump fails, the backup pump must be started within 1 minute, and attention should be paid to the operation of the molecular sieve. If the other adsorber is properly cooled, it should be switched over promptly.
CO2 is not absorbed; once it penetrates through the molecular sieve bed, it freezes inside the cold box. To resolve this issue, the system must be shut down and the temperature of the cold box raised to sublimate the CO2.
If the lean methanol pump fails to operate for an extended period, it can lead to excessive levels of certain gases in the output gas; in severe cases, this may cause poisoning of the synthesis catalyst. However, it is likely difficult to start the backup pump within one minute
It is recommended to reduce the system load by venting from the converter; this can be done when the load is low, but it’s not possible when the load is at full capacity! So we need to reduce the load! We have experienced a trip condition at 110% load.
It is difficult to start such large pumps in a short period of time, and their methanol-depleted fluid pumps are usually imported, so the likelihood of them failing is low; as a result, the backup pumps may not be adequately prepared. Therefore, it is still necessary to switch to using the outlet vent to prevent the adsorber from being damaged due to freezing
What was said upstairs is correct. But if you really want to drive within a minute, you need to be prepared at all times. . It tests skills and experience.
During routine inspections, it is necessary to check the standby pumps to ensure they are ready to be started at any time. It takes half a minute for the control room to reach the site; then the system is started and the outlet valve is opened, but several strong workers are needed for this.
What are the methods? It’s best to release the pressure first, vent the process gas, and after a circulation cycle is established, then guide the gas in
Once out of the vehicle, cut off the gas immediately to prevent hydrogen sulfide levels from rising, and make adjustments accordingly.