HP March 2022 eBook—Energy Transition - 73

Plant Safety and Environment
ferent scenarios were achieved for heat integration
of the unit.
Analysis of energy efficiency alternatives
in the simulation model. After
model validation, five different cases were
generated to analyze fuel savings and CO2
emissions reduction alternatives. Details
of these alternatives are summarized here.
Case 1. In this case, the target was
the addition of a new heat exchanger to
the preheat train between the Feed-PA
and the Feed-LT distillate for the heating
charge of the unit via the VR stream,
shown in FIG. 2. The number of shells in
the new heat exchanger were changed
to determine the effects on energy savings
and CO2
emissions reduction rates.
The re-arrangement of the existing FeedVR
heat exchangers from four shells to
2 × 2 shells as an alternative scenario for
the new system was also studied.
Case 2. In this case, the target was the
rearrangement of the heat exchanger hot
side services for the Feed-HV distillate-2
from the HV distillate stream to the VR
stream, as shown in FIG. 3. All HV distillate
Lube oil feed
Feed-PA
heat exchangers
(4 Shells)
Feed
Feed-VR
heat exchanger
(modified)
FIG. 6. Revised preheat train after Case 5.
Feed-HV distillate
heat exchanger
Feed-VR
heat exchangers
(4 Shells)
Feed-LT distillate
heat exchanger
Lube oil
HEX
streams were diverted to the Feed-HV distillate-1
heat exchanger-in this way, the
Feed-HV distillate-2 heat exchanger is revised
as the Feed-VR heat exchanger. The
energy savings potential of the rearranged
pre-heat train was studied to determine the
effects on fuel consumption of the fired
heater and CO2
emissions reduction rates.
Case 3. In this case, the target was the
addition of a new heat exchanger to the
pre-heat train between the Feed-LT distillate
and the Feed-HV distillate-1 for
the heating charge of the unit via the VR
VR to tanks
Lube oil unit
fired heater
Lube oil
process
VR
Fired heater
Vacuum
distillation
stream, as shown in FIG. 4. The number
of shells in the new heat exchanger were
changed to determine the effects on energy
savings and CO2
emissions reduction
rates. The rearrangement of the existing
Feed-VR heat exchangers from four shells
to 2 × 2 shells as an alternative scenario for
the new system was also studied.
Case 4. In this case, the target was the
addition of new heat exchangers to two
separate locations for heating charge of
the unit via the VR stream. The first addition
is between the Feed-PA and the
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HP March 2022 eBook—Energy Transition

Table of Contents for the Digital Edition of HP March 2022 eBook—Energy Transition
