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Energy and Exergy Analysis of FCCU Pre-Heating Unit of KRPC, Nigeria
Conference PresentationAt The
3rd INTERNATIONAL DOWNSTREAM CONFERENCE/EXHIBITION ON PETROLEUM REFINING, PETROCHEMICALS & FERTILIZERS, PORT HARCOURT 2014
August 27-28, 2014
1
Presentation Outline Introduction Literature Review Experimental Analysis Process Description Results and Discussion Conclusion and
Recommendation Reference
2
INTRODUCTION
Why exergy and energy analysis?Due to the relatively high energy cost as a component of a unit production cost, it is necessary for any plant to carry out analysis of energy utilization. Exergy analysis is a methodology for the evaluation of the
performance of devices and processes, this involves examining the exergy at different points in a series of energy-conversion steps. With this efficiencies can be evaluated, and the process steps having the largest losses can be identified (Rosen, 2004).
kk.
Ideal Work Exergy Destruction/Loss
Second Law Efficiency
3Figure 1. Major components of exergy and energy analysis
Component of Exergy
SCOPE OF STUDY
To analyze FCCU Pre-Heating Unit of Kaduna Refining and Petrochemical Company (KRPC) through energy and exergy perspective.
Sites of primary energy loss and exergy destruction will be determined.
The second law and exergy efficiencies will also be determined.
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LITERATURE SURVEY
Kaduna Refining and Petrochemical Company (KRPC) It was design and constructed by a Japanese Chemical
Engineering Company (CHIYODA) It was commissioned in 1980 as NNPC Refinery Kaduna,
with an initial capacity of 100,000 barrels per stream day [BPSD].
The Refinery was designed to process both Nigerian and imported crude oils into fuels and lubes products.
The purpose of FCCU Pre-heating Unit is to preheat the feed before entering the catalytic reactor.
The most widely used cracking units are the catalytic type with a moving catalyst bed of Zeolite – Y as this gives a higher conversion and selectivity.
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EXPERIMENTAL ANALYSIS
The system ideal work is given by;
= (2)
= (3)
The second law system efficiency for work producing system is given by;
The exergy efficiency of the system is given by;
=
= m [ - (7)
The specific exergy is given by;
Ψ = h -
Then the total exergy rate associated with fluid stream becomes;
χ = m Ψ = m [h - (9)6
PROCESS DESCRIPTION
Figure 2: Preheating section of FCCU in KRPC
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16D15
16P01A
16P01B
16E02
16E03
16E04
16E05
16H02
RESULT AND DISCUSSION
8Figure 3: Second law efficiency
RESULT AND DISCUSSION
9Figure 4: Exergy efficiency
CONCLUSIONS
The exergy and energy analysis of FCCU Pre-Heating Unit was done successfully.
The exergy destruction (loss work) was found to be high in Heat Exchanger 16E-02.
The calculated second law and exergy efficiencies of the system were 43.61 and 56.99% respectively.
REFERENCES
J. Szargut, D.R. Morris, F.R. Steward, Exergy Analysis of Thermal, Chemical, and Metallurgical Processes, Hemisphere, New
York, 1988. M. Kopac, A. Hilalci, Effect of ambient temperature on the
efficiency of the regenerative and reheat Catalag˘zı power plant in Turkey, Applied Thermal Engineering 27 (2007) 1377–1385.
M. Rosen, I. Dincer, Effect of varying dead-state properties on energy and exergy analyses of thermal systems, International
Journal of Thermal Sciences 43 (2004) 121–133. Nigerian National Petroleum Corporation (2004), FCCU Refresher
Course Programme, 2004. Z. Utlu, A. Hepbasli, A review on analyzing and evaluating the
energy utilization efficiency of countries, Renewable and Sustainable Energy Reviews 11 (2007) 1–29.
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