• We are facing lots of solid formation in the quench tower circuit of our TGT Unit. What can be the reason and how are solids/salts formed in this circuit?



  • Arun RS, Indian Oil Corporation, arunrskmr@gmail.com

    Solid particles are created because of salt formation with S02 in the tail gas. check your tail gas analyzer and ensure H2S/So2 ratio is 2:1 always. avoid slippage of SO2 at any time by adjusting trim air. If S02 slips add more hydrogen to react the S02. If your Reduction reactor temperature rises, it is clear that S02 slippage. drain quench water and replinish with DM water to remove the salts. Salts will eventually clog the quench water pump suction strainer and affect quench water circulation.



  • Mayur Gami, Reliance industries Ltd, gamimayur.s@gmail.com

    One common cause of solid formation in quench tower circuit is So2 breakthrough. If tail gas ratio not maintain H2S:So2 (2:1) in SRU and PH will goes below 7, so I guess you will add NH3 for maintaining PH in quench tower, so this reaction happen in there (NH3 + H2O → NH4OH)

    NH4OH absorbs amounts of H2S (NH4OH + H2S → H2O + NH4HS)

    If so2 breakthrough then so2 will react with water and product Sulphurous acid.(SO2 + H2O → H2SO3)



  • Sridhar Balakrishnan, BHARAT OMAN REFINERIES LTD, balakrishnan_sridhar2001@yahoo.co.in

    Kindly refer https://www.digitalrefining.com/article/1001271/the-role-of-tail-gas-treating-unit-quench-towers.

    The topic of the article is "The role of tail gas treating unit quench towers" written by authors  RALPH WEILAND, CLAYTON JONES and NATHAN HATCHER of Optimized Gas Treating, Inc. This article covers extensively about quench towers  in TGTU unit, salt formations etc. This should help to overcome the problem.



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