Anybody know the temperature of the output gas in a wet electrostatic precipitator?

[Howard]

I read somewhere that they operate at around 700F, but I was wondering if it was necessary for the gas to be that hot to be cleaned.

 

[GimpyOne]

Well, I'm not 100% sure, but I think that that temperature is near the upper operating limit of the EP as they are constructed of alot of steel, not a required operating temperature. It just so happens that that type of temp is experienced alot as most of these systems are on things like large ovens and furnaces.

From what I have seen, the reality is that the output temperature is highly dependant on the input temperature and a high temp is not required. As an example, the wood industry uses these when drying wood pulp with large fans to remove fibers from the air. While the wood does heat some while drying, it is not at 700F.

On the other end is the glass industry where the outgas from the hot end of the batch tank is run through EP and WEP systems to remove silica sand, carbonates, and sulfates from the stack emmissions. In this case, you are running very close to the temperature limit of these machines.