Daniel Flórez-Orrego

Ecole Polytechnique Federale de Lausanne, Mechanical Engineering, Post-Doc

University of Sao Paulo, Polytechnic School, Alumna

Universidad Nacional de Colombia Sede Medellin, Facultad de Minas, Alumna

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Mechanical Engineer, National University of Colombia, Faculty of Minas, Medellin (2011). MSc (2014) and DSc (2018) in Mechanical Engineering: Energy and Fluids, Polytechnic School of the University of São Paulo, Brazil. His research activity has been funded by the National Agency of Petroleum, Natural Gas and Biofuels - ANP, PRH-19 (2012-2018), the Swiss Government Excellence Scholarship Program - ESKAS (2016-2017) and the Colombian Administrative Department of Science, Technology and Innovation - COLCIENCIAS. Currently, he works as a postdoctoral research fellow in the Industrial Process Optimization field at the Laboratory of Thermal and Environmental Engineering (LETE) of the Polytechnic School of the University of São Paulo. Member of ACIEM, Ant. Col.

Review Committee: Applied Energy / Energy Conversion and Management / Energy / International Journal of Hydrogen Energy / Journal of Cleaner Production / Resources, Conservation & Recycling / Journal of CO2 utilization
Supervisors: Silvio de Oliveira Jr, Hector Velasquez A, and Francois Marechal

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Techno-economic and environmental analysis of high temperature heat pumps integration into industrial processes: the ammonia plant and pulp mill cases

Sustainable Energy Technologies Assessment, 2023

Heat pumps will play an important role in improving the performance of the industrial processes a... more Heat pumps will play an important role in improving the performance of the industrial processes aiming to decarbonize their heating requirements. Yet, defining the best operating conditions of those devices may be a challenging task, as they are embedded in larger energy conversion systems and in direct competition with fired and electric heaters and other waste heat recovery systems. The costs of the energy inputs also influence the selection of either a heat pump or a gas boiler, which affects the overall efficiency and the incremental cost of the final solution. Thus, a systematic analysis must be applied in order to determine the best option to supply the heating requirement, without considerably impacting the operational feasibility of the overall plant. In this work, the base-case performance of two industrial applications with intensive heating demand, namely, the solvent regeneration process of a carbon capture unit and the black liquor concentration process of a kraft pulp mill, are compared to that of the scenarios in which a high temperature heat pump or a mechanical vapor recompression unit are integrated, aiming to reduce the energy consumption and the environmental impact. The benefits of the integration of a heat pump or a mechanical vapor recompression unit over a conventional reboiler and a multiple effect evaporation system are discussed in the light of thermodynamic, economic and environmental indicators. As a result, the alternative approaches remain competitive vis-à-vis the conventional solutions in terms of energy consumption and operating costs. In addition, the emissions associated to the heating applications could be reduced by 45% if a high temperature heat pump is integrated. The optimized solution using a heat pump has an overall exergy efficiency 9% higher compared to the typical configuration of the ammonia plant. In pulp mills, the integration of mechanical vapor recompression systems slightly affects the performance compared to the conventional scenario with a multiple effect evaporation system.

Daniel Flórez-Orrego

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