Helen BECKER, Francois MARECHAL, Aurelie VUİLLERMOZ

Process Integration and Opportunities for Heat Pumps in Industrial Processes

Process integration methods allow one optimizing industrial processes. The main goals are decreasing energy demand and operating costs as well as reduction of pollutants emissions. High fuel costs promote installations of heat pumps. In a heat pump, process waste heat is valorized by electrical power to produce higher quality heat. This energy is used to satisfy a part of the process demand so that less fuel is required and CO2 emission will decrease. This paper presents a methodology, based on pinch analysis, which demonstrates the opportunity of integrating heat pumps in industrial processes. The method considers the whole process including utilities and the energy conversion system. A combined analysis which considers thermal and material streams in the process is realized to optimize the heat recovery and the integration of energy conversion units. By analogy, all water streams are listed and the potential of water recuperation is calculated. The combination of appropriate refrigeration and heat pump cycles leads to an important energy saving potential. The respective ﬂow rates are deﬁned by optimization. The application case of a typical dairy process is used to calculate the energy and operating cost savings potential.

Keywords:

energy integration pinch analysis method, heat pumps, dairy,

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Bagajewicz, M., & Barbaro, A. (2003). On the use of heat pumps in total site heat integration. Computers and Chem- ical Engineering, 27, 1707-1719.
Berntsson, T. (2002). Heat sources - technology, economy and environment. International Journal of Refrigeration, 25, 428-438.
Colmenares, T., & Seider, W. (1987). Heat and power inte- gration of chemical processes. American institute of chem- ical engineering journal, 33, 898-915. Dubuis, M. (2007).
Etude thermo-économique de
l’intégration des pompes à chaleur industrielles. Master’s
thesis, LENI - Ecole Polytechnique Fédérale de Lausanne.
Eurostat. (2009). Energy, transport and environment indica- tors. eurostat.
Frischknecht, R., Jungbluth, N., Althaus, H.-J., Doka, G., Dones, R., Heck, T., et al. (2005). The ecoinvent database: Overview and methodological framework. International Journal of Life Cycle Assessment, 10, 3–9.
Holiastos, K., & Manousiouthakis, V. (2002). Minimum hot/cold/electric utility cost for heat exchange networks. Computers and Chemical Engineering, 26, 3-16.
IEA. (2009). Key world energy statistics. International en- ergy agency - IEA.
IEA-CO2. (2008). Heat pumps can cut global co2 emissions by nearly 8%. International energy agency - IEA. Kemp, F. (2007).
Pinch analysis and process integra
tion: a user guide on process integration for the effi
cient use of energy. Second Edition, Elevier, Butterworth- Heinemann,UK.
Leyland, G. (2002). Multi-objective optimization applied to industrial energy problems. Thesis, Ecole Polytechnique Fédérale de Lausanne.
Linnhoff, B., & Townsend, D. (1983). Heat and power net- works in process design. part 1: Criteria for placement of heat engines and heat pumps in process networks. AIChE Journal, 29(5), 742-748.
Loken, P. (1985). Process integration of heat pumps. Heat Recovery Systems, 5(1), 39-49.
Maréchal, F. (1997). Méthode d’analyse et de syntèse én- ergétique des procédés industriels. Thesis, Université de Liège.
Maréchal, F., Closon, H., Kalitventzeff, B., & Pierucci, S. (2002). A tool for optimal synthesis of industrial refrig- eration systems: Application to an olefins plant. New Or- leans, USA.
Maréchal, F., & Favrat, D. (2006). Combined exergy and pinch analysis for optimal energy conversion technologies integration. ECOS 2005: 18th International Conference on Efficiency, Cost, Optimization, Simulation and Environ- mental Impact of Energy Systems, 1, 177-184.
Maréchal, F., & Kalitventzeff, B. (1998). Energy integra- tion of industrial sites: tools, methodology and applica- tion. Applied Thermal Engineering, 18, 921-933.
Maréchal, F., & Kalitventzeff, B. (2003). Targeting the in- tegration of multi-period utility systems for site scale pro- cess integration. Applied Thermal Engineering, 23, 1763- 1784.
Muller, D., Maréchal, F., Wolewinski, T., & Roux, P. (2007). An energy management method for the food industry. Ap- plied Thermal Engineering, 27, 2677-2686.
Périn-Levasseur, Z., Palese, V., & Maréchal, F. (2008). En- ergy integration study of a multi-effect evaporator. Pro- ceedings of the 11th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollu- tion Reduction.
Ranade, S. (1987). New insights on optimal integration of heat pumps in industrial sites. Heat Recovery Systems& CHP, 8(3), 255.
Shelton, M., & Grossmann, I. (1986). Optimal synthesis of integrated refrigeration systems parts 1 and 2. Computers and Chemical Engineering Journal, 10(5), 445-459.
Staine, F., & Favrat, D. (1996). Energy integration of in- dustrial processes based on the pinch analysis method ex- tended to include exergy factors. Applied Thermal Engi- neering, 16, 497-507.
Swaney, R. (1989). Thermal integration of processes with heat engines and heat pumps. American institute of chem- ical engineering journal, 35, 1003-1016.
Wall, G., & Gong, M. (1995). Heat engines and heat pumps in process integration. Thermodynamics and the Design, Analysis, and Improvement of Energy Systems, ASME, 35, 217-222.
Wallin, E., & Berntsson, T. (1994). Integration of heat pumps in industrial processes. Heat Recovery Systems& CHP, 14(3), 287-296.
Wallin, P., E. Franck, & Berntsson, T. (1990). Heat pumps in industrial processes - an optimization methodology. Heat
Recovery Systems& CHP, 10(4), 437-446.

International Journal of Thermodynamics-Cover

ISSN: 1301-9724
Yayın Aralığı: Yılda 4 Sayı
Başlangıç: 1998
Yayıncı: -

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