Vezirov R.R.,BR Institute of Petrochemical Refining GUP |
Gareev R.G.,BR Institute of Petrochemical Refining GUP |
Obukhova S.A.,BR Institute of Petrochemical Refining GUP |
Vezirova N.R.,BR Institute of Petrochemical Refining GUP |
Khalikov D.E.,BR Institute of Petrochemical Refining GUP
Chemistry and Technology of Fuels and Oils | Year: 2010
The feedstock-resid heat exchange block in the visbreaking unit leads to serious problems in operating the units that includes decrease in heat-exchange efficiency, an increase in power consumption and reduction of the operating time between repairs. The number of undesirable polymerization-polycondensation reactions can be reduced by minimizing the residence time of the resid in the tower. The filters installed before and/or after the last pump can trap relatively large and solid coke particles from the furnace, reaction chamber, and tower but are subject to coking. The gasoil washing of the heat exchangers is to be performed periodically to dissolve and wash off the pitch polymer deposits before the pressure differential in the equipment is greater than the acceptable value and the deposits become insoluble in gasoil. Several companies propose using coil heat exchangers characterized by a lower tendency to clog in operating with media containing solid contaminants as a solution to the heat exchange problems in visbreaking units.