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quench the Coke Drum overhead material. Excess
heavy material is recovered in the Fractionator. A
light slop oil and sour water are also products from
the Closed Blowdown System.

Plant Process Description

During the Coke Drums steaming and quenching
operations, hot steam and stripped oil vapor flow
to the Blowdown Tower (figure 2,3). In this tower,
the steam is cooled and the oil vapor is partially
condensed by counter-current contact with a cir-
culating oil stream.

Figure 1 – Front view of the existing DCU from the Coke
Pad

stem. The Coke Drum steaming and cooling is
done with the open blowdown stack as per the
original design.

Project Objectives

Upon the enforcement of the Romanian Law
278/2013, transposing the EU Directive 2010/75/
EC on industrial emissions (integrated pollution Figure 2 – Lifting of the new
prevention and control) and the EU Decision Blowdown Tower
738/2014 establishing the BAT conclusions, the
Petrobrazi refinery approved the implementation of
the best available technique for the Delayed Coker
process by using a Closed Blowdown System.

Petrobrazi refinery approved
the implementation of the best
“available technique for the
Delayed Coker process by using
a Closed Blowdown System

The main objectives of the new System are: (i) to
eliminate the emissions to air and water that occur
during normal operation from the existing open
blowdown, (ii) to reduce product losses in the
existing DCU and (iii) to improve the refinery water
management system.

The Closed Blowdown System is used during
the Coke Drum steaming and quench operations
to collect and recover the wax tailings material
remaining in the Coke Drum. The cooled and Figure 3 – Blowdown Tower
condensed heavy hydrocarbons are used to in the final configuration

Impiantistica Italiana - Maggio-Giugno 2019 85