I would like to ask everyone about the cold drum exhaust gas recovery process
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What are everyone’s respective processes for recovering cold exhaust gases? Among those I’ve come across, there is 1: the exhaust gases are collected uniformly and then sent back to the negative pressure system (but since we have strict requirements regarding the oxygen content in the gas, this method is not suitable for us). 2. The exhaust gases are collected centrally and then discharged after passing through a water scrubber tower. However, it is not known whether the parameters of these exhaust gases after water washing meet the emission standards; moreover, **there are currently no unified regulations on this, but I assume that such regulations will be established sooner or later. 3. There are designs for acid wash discharge in the vicinity of the factory area, but the actual effects remain unknown. Are there any other more mature methods? If possible, let’s share them with each other.
We use absorption methods for our exhaust gases, which is similar to the second method you mentioned
Primarily ammonia; if ammonium sulfate is produced, it can be pickled with acid