Title: Thermo-economics analysis and evolutionary-based optimisation of a novel multi-generation waste heat recovery in the cement factory

Authors: A.R. Noorpoor; S. Rohani

Addresses: Mechanical Engineering, Graduate Faculty of Environment, University of Tehran (UT), Tehran, 9821, Iran ' Graduate Faculty of Environment, University of Tehran, Tehran, 9821, Iran

Abstract: Cement factories are amongst the most energy consuming industries in the world. In view of the fact that almost a half input of energy is lost in clinker product, makes the waste heat recovery (WHR) system more interesting. In this paper, a new three-source multi generation flash WHR cycle is presented. Ammonia-water absorber chiller part of the cycle generates cooling load from turbine exhaust fluid and the residual heat is utilised in a heating system. Exergoeconomic analysis is also done to determinate cost rate of the power. To determine the optimal state of the system, the common evolutionary-based method, genetic algorithm, have been employed with aim of multi objective optimisation. Eventually, the results of a case study shows 6.45 MW power, 2.91 MW cooling and 2.88 MW heating are generated. Take one point of optimum Pareto front for instance, it has 55.6% energy and 73.9% exergy efficiencies.

Keywords: exergy analysis; WHR; waste heat recovery; multi-generation; MOO; multi-objective optimisation; exergoeconomics; absorber chillers; cement factories; cooling load; turbine exhaust fluid; residual heat; genetic algorithms; exergy efficiency.

DOI: 10.1504/IJEX.2016.080065

International Journal of Exergy, 2016 Vol.21 No.4, pp.405 - 434

Received: 17 Sep 2015
Accepted: 09 May 2016
Published online: 31 Oct 2016 *

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