In this paper, the energy performance of a selected
UHDE Ammonia plant is optimized by conducting heat integration through waste heat recovery and the synthesis of a heat exchange
network (HEN). Minimum hot and cold utility requirements were estimated through IChemE spreadsheet. Supporting simulation was
carried out using HYSYS software. The results showed that there is
no need for heating utility while the required cold utility was found to
be around 268,714 kW. Hence a threshold pinch case was faced. Then, the hot and cold streams were matched appropriately. Also,
waste heat recovered resulted with savings in HP and LP steams of
approximately 51.0% and 99.6%, respectively. An economic analysis
on proposed HEN showed very attractive overall payback period not
exceeding 3 years. In general, a net saving approaching 35% was
achieved in implementing heat optimization of current studied UHDE Ammonia process.
 El-Halwagi, M. M., "Sustainable Design through Process Integration:
Fundamentals and Applications to Industrial Pollution Prevention,
Resource Conservation, and Profitability Enhancement", Butterworth-Heinemann/ Elsevier, Amsterdam (2012).
 Mann, J. (1999). Process Integration: Unifying Concepts, Industrial
Applications and Software Implementation.
 QAFCO. QAFCO Becomes World-s Largest Ammonia and Urea
Producer. Retrieved on July 26, 2012. From:
 Hydrocarbon Processing. (2005). Petrochemical Processes 2005. (PDF
version of document downloaded September 26, 2010).
 Cengel, A. Y. & Boles, A. M. (2007). Thermodynamics. 6th Edition. Mc Graw Hill: New York, USA.
 Daghash, S. (Personal Communication). Energy Saving & Recovery
Handout. Chemical Engineering Department. Qatar University. March
 Sinnot, R. & Towler, G. (2009). Chemical Engineering Design. 5th
Edition. Elsevier: Burlington, USA.
 Eljack, T. F. (Personal Communication). Chemical Engineering Department. Qatar University. March 20, 2011.
 Yoon a, S., Lee b, J., & Park, S. (2006). Heat integration analysis for an
 Matsuda a, K., Hirochi a, Y., & Tatsumi b, H. (2009). Applying heat
integration total site based pinch technology to a large industrial area in
Japan to further improve performance of highly efficient process plants.
 American Institute of Chemical Engineers - IChemE Heat Integration
Excel Spreadsheet - 2012.