Can shifted gas replace tower equipment?
Thread Content
Can shifted gas be used to displace air in tower equipment? co 3.0 co2 24.0 H2 51.0 N2 21.0
No, it can easily lead to the formation of mixed explosive gases. The space should first be purged with an inert gas before being purged with a shift gas.
That’s not possible, right? The gas mixture contains a high amount of hydrogen, and moreover, hydrogen has a very wide explosive range, so accidents are likely to occur
It’s definitely not possible; the H2 content in your gas mixture at 51.0 is definitely within the explosive range!
It cannot be beyond doubt. Inert gases (nitrogen, carbon dioxide or their mixtures, steam, etc.) are generally used to purge tower bodies or equipment.
There are roughly two scenarios for replacing components in a production system: one is to replace them after shutting down the system for maintenance, and the other is to do so after the maintenance is completed and the system is restarted； The nature of displacement is different in the two cases: in the first case, it is mainly about removing the flammable components from the system, while in the second case, it is mainly about removing oxygen from the system ； In principle, inert gas displacement is required in both cases ； However, many plants use substandard raw gas when purging the copper washing system while operating; the shift gas, after passing through the carbonization system, does not have CO2 levels at the required standard. In this sense, it is possible to use shift gas for system purging under certain conditions, but the following points should be taken into account: 1. Maintain the system at atmospheric pressure ； 2. Avoid all generation of static electricity or sparks.
Generally, it is not possible, as it can easily result in a mixed explosive gas. But in many plants, many experienced operators use substandard raw gas when replacing the methanol system and the copper washing system – the shift gas, after passing through the carbonization system, does not have CO2 levels at the required standard. In this sense, it is possible to use shift gas for system replacement under certain conditions; however, it is important to note the following: 1. Ensure that the space velocity is not too high ； 2. Keep the system at atmospheric pressure ； 3. Keep the system at atmospheric pressure.