A heat exchanger network (HEN) for the process of methanol synthesis has been studied by combination of pinch design method and the application of “Twisted Tube” heat exchanger units as a new technology. The HEN is reconstructed based on the full utilization of maximum allowable pressure drops for the process hot and cold streams. An algorithm is developed to generate design procedure for twisted tube application. The algorithm needs to extend and develop correlation among the pressure drops, heat transfer coefficients, and required surface area through a simple relationship for twisted tube exchangers. It is revealed that a great economic, energy savings and process improvement are realized by using pinch analysis and applying twisted tube units in comparison to existing plants. The paper reveals highly potential benefits of this technology in design and replacement of twisted tube heat exchangers with the conventional shell and tubes type. The HEN is reconstructed by adding 4 new twisted tube units with their detail design in methanol process as a case study. The results show that the application of twisted tube exchangers may achieve significant energy saving for the methanol process with a one-year payback. Moreover, these units may result in a great reduction of carbon emission, operational problems such as heat exchanger fouling, and tube bundle vibration of heat exchangers.
. Jegede F. O., and Polley G. T., “Optimum Heat Ex changer Design”, Transactions of IChemE, Part A 70 , pp. 133–141, 1992.
. Nasr M. R. J., and Polley G. T., “Should You Use Enhanced Tubes”, Chemical Engineering Progress, CEP, pp.45-50, April 2002.
. Nasr M. R. J., Behfar R., “Enhanced Evaporative Fluid Coolers” Applied Thermal Engineering Journal, ATE-30, pp. 2746-2752, 2010.
. Nasr M. R. J., Alaei S. H., “A New Algorithm for Design, Simulation and Optimization of Enhanced Air Coolers”, Journal of Enhanced Heat Transfer, 14(2) 147-160, USA, spring, 2007.
. Hemmat A., Application of Twisted Tube Heat Exchanger in Network, MSc. Dissertation, Sahand University of Technology, Department of Chemical Engineering, Tabriz, Iran, Summer 2010.
. Nasr M. R. J., Hemmat A., and Salem A., “Quick Design Algorithm and Investigation of the Performance Characteristics of the Novel Twisted Tube Heat Exchangers Technology in Petroleum Industry (Part 1)”, Vol. 21, No. 67, Petroleum Research journal, Autumn 2011.
. Deylami P., Energy Saving of Methanol Plant of Fan Avaran Petrochemical Co. (FPC), MSc. Dissertation, Azad University, Energy &Environment Dept., Tehran, Iran, 2010.
. Nasr M. R. J., and Deylami P. “CO2 Reduction and Energy Conservation in a Methanol Plant Using Pinch Technology with Pressure Drop Consideration”, 3rd IUPAC Congress, Ottawa, August, 2010.
. Abrishami A., Application of Twisted tube heatexchangerfor Energy Saving of Preheated Train of Refineries, MSc. Dissertation, Azad University, Energy & environment Dept., Tehran, Iran, spring 2012.
. Nasr M. R. J., Abrishami A., Process Improvement in Methanol Plant, 2nd ICEPR 12 Int. Congress, Montreal, August, 2012.
. Morgan R. D., Brown Fin tube Company, Twisted Tube Heat Exchanger Technology. http://www.wahchanglabs.com/pdf/2k1ConfProc/2001007.pdf, Oct. 2008.
. Zukauskas A. A., Jankauskas R. I., Survila V.J., Thermo-hydraulic Performance of Bundles of Twisted oval Tubes – Operating in Cross Flow, Heat Transfer-Soviet Research 18 (5), 1986.
. Brodov Y. M., Aronsonand K. E., and Berg B.V., “Heat Transfer in Condensation of Flowing Steam AcrossVertical Twisted Tubes”, Heat Transfer Soviet Research 23(2), pp. 269–274, 1991.
. Dzyubenko B. V., Ashmantas L. V., and Segal M.D., Modeling and Design of Twisted Tube Heat Exchangers, Begell House Inc., New York, USA, 1998.