What's the (or an) exact procedure for cleaning in place of a sewage sludge HX (for digester heating, medium would be sludge from digester, possibly with raw sludge mixed in):
Isolate HX, flush with citric acid? It should make a noticable difference if raw sludge is mixed in or not, I could imagine that acids work well on MAP but ot on proteins. Is this so? What other cleaning agents can be used? Can you flush the citric acid into the digester (slowly ...) or does it need to be deposed off site?
Is CIP typically sufficient? Lackeby has these HX designed for easy mechanical cleaning, is this actually worth it?
On most plants I've been to, the HX where hardly accessible. I can't imagine a mechanical cleaning more often than every few years.
Isolate HX, flush with citric acid? It should make a noticable difference if raw sludge is mixed in or not, I could imagine that acids work well on MAP but ot on proteins. Is this so? What other cleaning agents can be used? Can you flush the citric acid into the digester (slowly ...) or does it need to be deposed off site?
Is CIP typically sufficient? Lackeby has these HX designed for easy mechanical cleaning, is this actually worth it?
On most plants I've been to, the HX where hardly accessible. I can't imagine a mechanical cleaning more often than every few years.
