How to remove nitrogen from the feed gas
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Since the raw gas used in the production of polysilicon contains a certain amount of nitrogen, which may affect the purity of polysilicon, how can this nitrogen be removed? Is there a simple and practical method?
Then use H2 for displacement; the general scientific guideline is to perform 5 displacements, from 5 bar to 1 bar
How much nitrogen is in the feed gas? If TCS is present, considering the addition of an evaporation-cooling device makes sense: first, the TCS is vaporized and then cooled; the condensate is TCS free of nitrogen, while the non-condensable components are N2 and a small amount of TCS ； If hydrogen contains N, using the replacement method on the second floor will suffice
1# maohaibo: I’m not familiar with the manufacturing process, but during oxygen production, molecular sieves are used to absorb nitrogen. You might want to inquire whether the use of molecular sieves for nitrogen absorption is an option.
If the nitrogen content in the recovered hydrogen is too high, it is sufficient to discharge it regularly and replenish it with new electrolyzed hydrogen
It depends on which work section you are in; for reduction, you can use H2 for displacement. . .
Molecular sieves can be used to remove nitrogen from hydrogen. Our company has installed a nitrogen removal system. Molecular sieves are what are used. It’s from Sichuan Tianyi Technology. Remove nitrogen using pressure swing adsorption! Request extra points!
The key is to find out what causes the nitrogen to enter. Could it be that the furnace or equipment wasn’t properly purged during integration into the system, or are there leaks somewhere? Replenishing gas and removing exhaust gases increases production costs to some extent
Here, we use a stripping tower to remove the nitrogen from TCS before it enters the furnace. If your process does not have a stripping tower, it might be quite troublesome~~~
Blow hard with hydrogen, really hard!
Guys, which of your companies have high levels of hydrogen and nitrogen in the recovered gas?