Optimal Design and Operating Conditions of an Integrated Plant Using a Natural Gas Combined Cycle and Postcombustion CO2 Capture

JUAN I. MANASSALDI; PATRICIA L. MORES; NICOLÁS J. SCENNA; SERGIO F. MUSSATI

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

AMER CHEMICAL SOC

Año: 2014 vol. 53 p. 17026 - 17042

0888-5885

This paper deals with the simultaneous optimization of the operating conditions and sizes of each one of the process units of a natural gas combined cycle coupled to a post-combustion CO2 capture system. Precisely, from the mathematical models previously developed by the authors for each stand-alone process, a new optimization NLP model is proposed in order to optimize the whole process but with the main characteristic that several feasible alternatives to integrate both processes are simultaneously embedded. Therefore, as a result of the model, the best integration schema, optimal operating conditions and size of each process units are obtained at the same time. No integer variables are needed to model discrete decisions in both processes. The maximization of the overall thermal efficiency is considered as objective function. However, the proposed NLP model can be easily extended into a MINLP model if it is necessary for cost minimization. The optimization results are discussed in detail and they are compared with sub-optimal configurations including reference cases.