What are those crystalline substances that have been removed from the inlet filter of the raw gas compressor in dry gas hydrogen production?
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Gray crystals that disappear when blown with steam. What is this? Where did you bring it from? (The raw materials are catalytic dry gas, coking dry gas, natural gas, and light fraction gas; aside from significant liquid presence in the catalytic dry gas, there are no other abnormalities.)
From what you say, this gray substance seems to be salt crystals; try taking some of it and see if it dissolves in water. Simple salts should be detectable through testing.
It should be possible to get rid of it with steam in just one blow
They said it was brought in by the low-pressure belt
1. Part of it is ammonium salt crystals. 2. High flow rate and low temperature cause some hydrocarbons to crystallize