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Coke quenching water

Coke quenching water

Coke quenching water

(OP)
During the production process red hot coke is instantaneously  cooled by quenching with water (200 tons in 10 minutes) The water recirculates - - - it achieves a steady 70 degree cent and is held in an unlined steel tank which has lost 8 mm thickness in 8 years. Please has anyone any expeience of whats happening here - - will the water be acidic or what,  and will the reduction in tank wall thickness be due to corrosion or to erosion by the coke dust which recirculates in the water? ( I am told the water has pH of 8.0 ) Any comments much appreciated.
Corrosionman.

RE: Coke quenching water

pH 8.0 is slightly caustic- not acidic

RE: Coke quenching water

You might want to consider sampling on a daily basis and use a dosing pump as needed to add an acid to control pH. pH tests are relatively inevpensive, if you don't feel like shelling out a little more money for a pH analyzer.

"Scientists dream about doing great things. Engineers do them." -James Michener

RE: Coke quenching water

Carbon in contact with iron will lead to severe galvanic corrosion in the presence of an electrolyte.

RE: Coke quenching water

(OP)
Gentlemen  all your comments are so helpfull and have just about given the answer.  Compositepro ,I think yours is the key suggestion.  We have a very good understanding of galvanic corrosion but somehow never realised that wet coke is so very "powerfull". Into a saucer of tapwater we put a piece of mild steel and a piece of coke - - The voltage between them is 0.61 volts ( For Mild steel and stainless steel it is only 0.3 volts). The quench water tank floor will have coke sediment on it which just "eats" away at the mild steel,  and recirculation of quench water every hour keeps things moving.  I think we are beginning to understand the problem and how to protect a new tank (Rubber lining).
This is such a usefull forum
Many thanks
Corrosionman.   

RE: Coke quenching water

Yes,the dust from machining carbon fiber composites can quickly destroy machine tools if water is used for the coolant. Salts in the water and oxygen are part of the mechanism.

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