Abstract

PAREDES-SANCHEZ, José Pablo et al. Using waste energy from the Organic Rankine Cycle cogeneration in the Portland cement industry. Dyna rev.fac.nac.minas [online]. 2015, vol.82, n.194, pp.15-20. ISSN 0012-7353.  https://doi.org/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.

Keywords : energy balance; heat recovery; Portland cement; Organic Rankine Cycle.

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