The diesel hydrogenation unit doesn’t have medium-pressure nitrogen – how do people operate it in such cases?
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The diesel hydrogenation unit doesn’t have medium-pressure nitrogen – how do people operate it in such cases?
Mainly, let’s talk about how operations are carried out when starting up and shutting down – let’s exchange ideas!
It is mainly used for pressurization and airtightness testing during startup, as well as system purging during shutdown. During startup and pressure increase, nitrogen is directed to the inlet of the new hydrogen machine; during shutdown and purging, nitrogen is directed to the outlet of the hydrogen circulation machine.
The new hydrogen compressor can compress gas, but since it’s not designed specifically for nitrogen, there is a limit to its capacity. If the pressure needs to be increased further, one can contact a pressure testing vehicle~~~
Many old facilities don’t have medium-pressure nitrogen, I guess. In my opinion: First, modern compressors all use two-stage compression; during the nitrogen sealing process, it’s no problem to use a compressor (or, ideally, a nitrogen-specific valve) to raise the pressure to 2.5 MPa. After that, it’s possible to directly replace it with hydrogen for sealing as well! At most, if the high-pressure hydrogen fails the airtightness test and pressure reduction is required, the costs will increase slightly. II. A pressure of 2.5 MPa is also sufficient when drying the catalyst.