Using waste energy from the Organic Rankine Cycle cogeneration in the Portland cement industry

• Published in: Dyna (Medellín, Colombia) Vol. 82; no. 194; pp. 15 - 20
• Main Authors: Paredes-Sánchez, José Pablo, Restrepo-Baena, Oscar Jaime, Alvarez Rodriguez, Beatriz, Osorio-Correa, Adriana Marcela, Restrepo, Gloria
• Format: Journal Article
• Language: English; Spanish; Portuguese
• Published: Bogota Universidad Nacional de Colombia 01.12.2015
• Subjects: balance de energía; Cemento Portland; Ciclo Orgánico de Rankine (ORC); energy balance; ENGINEERING, MULTIDISCIPLINARY; heat recovery; Organic Rankine Cycle (ORC); Portland cement; recuperación de calor; Cemento Portland; balance de energía; Ciclo Orgánico de Rankine; heat recovery; energy balance; recuperación de calor; Portland cement; Organic Rankine Cycle
• ISSN: 0012-7353; 2346-2183
• DOI: 10.15446/dyna.v82n194.44028

Cement production is intensive in terms of energy consumption. An analysis of the resources involved in manufacturing clinker needs a corresponding mass and energy balance. This balance may indicate the existence of residual heat flows that are not used. This paper summarizes the development of a protocol for the evaluation of a cement plant rotary kiln to implement an Organic Rankine Cycle (ORC) system for cogeneration. The results show that 19.2% of the energy preheater exhaust gas can be recovered to be used in producing 5.5 GWh/year of electricity and 23.7 GWh/year of thermal energy in the cement plant. The electricity generated would represent annual savings of 1.18 $/t cement. The thermal energy produced in cogeneration, equivalent to coal in the plant itself, represents cement savings of 0.51 $/t cement and emissions reductions of 8 kt CO2/year.