• Are there any methods to reduce coker furnace fouling through chemical injection in furnace tubes .

    If yes, how was the experience?



  • sam lordo, Becht, salordo@comcast.net

    It is rare to get one chemistry to work for all coker furnaces.. the key to whether a chemical additive will work is the how far above design heat flux is the furnace operating at .. anything above 30% the potential for bulk phase coking increases and chemical wont help

    Before trying a chemical approach
    - Where is the fouling? convention section may be due to too high of vaporisation, Radiant may be due to too high of heat flux.
    - Balance the flows to minimise too high of vaporisation in any tube.
    - What is the fouling... it may be coming in with the feed.




  • Imran Malik, www.Qchem.com.qa, immalik@qchem.com.qa

    For cracker furnaces, typically using DMDS Dimethly DiSulfide in concentration range of 50ppm or plus. There are non Suplhur technologies as well, like NALCO's COKELESS.


  • Alexander Vartapetyan, ARBADOX CHEMICALS, alexander.vartapetyan@arbadox.com

    Of course it exists! Many refineries use coke formation and polymerization inhibitors ("high-temp antifoulants") based on polyisobutylene succinimide chemistry (search "PIBSA" in google). Try to find ARBADOX chemistry on the Internet. As a result of the use of a coke formation inhibitor, the growth of coke is prevented and, as a result, the increase in pressure drop on heat exchangers is reduced. It is advisable to start the supply of reagents on clean equipment (after start-up). This is a very standard chemistry for visbreaking, thermal craking and DCU processes. Normal dosage rates for such chemicals is 20-30 ppm.



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