Abstract:
The first and most important stage of the Diesel quality and competency
improvement in Diesel Hydro treated unit (DHT) is the backwashing
process of the main filters, which is triggered periodically depending on
pressure differential (DP) and automatically through the Pneumatic
Control System (PCS). The (PCS) system described above represents the
main weakness point in the filtration system. It is mainly influenced by
many sub-issues related to the (PCS), and resulted in a bigger challenge
maintaining and supervising the (PCS). The situation briefly described
above eventually leads to low levels of diesel production and low quality.
The main question this research is trying to answer is: whether it is
possible to turn these systems from Pneumatic to electronic ones, using
the existing Distributed Control System (Foxboro).
In this research the virtual Foxboro DCS machine packages (ICC, Fox
draw, Fox select, Fox view, etc) were successfully used, and a new
program is proposed to control the filters cleaning process with high
constancy in monitoring and follow-up. In addition, the proposed
program increase the chances for operators to define time frames for;
filtering, maintenance, and the diesel quantity used in filtering process,
and many other advantages that helps improve the quality, increase final
product productively, and extend catalyst life time.
