We have a hydrotreater that receives its production from DCU. The feedstocks is coker Light gasoil.
Our hydrotreater has a backwash filter with 25 micron in the screens. Recently, the filter has plugged a lot.
Analysis from our lab showed that the “dirty” is mainly iron (FeS). We processed very often on the DCU main tower vessel “condensate” from our flares. This condensante is from the flare blowdown that are from the process units.
We think that our problem (hydrotreater filter plugged) is from this condensate flare.
Anybody has this kind of problem ? How is it the solution ?
Which is the operative temperature of the liquid sent to the backwash filter unit which is showing fast plugging ? Generally the backwash filters are plugged not only from Iron-sulphide solid particles but even more often from aphaltenes like sub-products which are agglomerating at temperatures below 150C and are stopped on the filter surface creating a not permeable gel layer.
Increasing the temperature those sub-products are becoming less viscous and are passing through the filter slots. If the operative temperature cannot be increased then it is necessary to replace the actual filter elements with other more fit for the characteristic of the feed fluid and relative contaminantion.
Regards, Roberto of BEA TECHNOLOGIES.
how is the amount the solid i (ppm)n your stream and also de distribution ?, I mean mesh vs percenteje
We have the same problem. The solution is to control the blowdown flare flowrate and with small step in order to reduce the mix of streams
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