Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
OPTIMIZATION OF THE WASTE HEAT RECOVERY SUPERSTRUCTURES FOR LARGE STATIONARY DIESEL ENGINES
Submission Author:
LEONARDO ARAUJO , ES
Co-Authors:
LEONARDO ARAUJO, Alexandre Morawski, Marcelo Aiolfi Barone, Andre Chun, Renan Cristofori Lima de Oliveira, Manuel Schiaffino, Carla César Martins Cunha, João L M Donatelli, José Joaquim Conceição Soares Santos
Presenter: Andre Chun
doi://10.26678/ABCM.ENCIT2018.CIT18-0578
Abstract
In a world with finite natural fuels resources and growing energy demand, issues related with thermal systems design, such as cost estimative, design complexity, environmental awareness and optimization are becoming increasingly important. In a typical large internal combustion engine (ICE), less than 45% of the fuel energy is converted into useful power output, while the remaining energy is mainly lost through exhaust gases and cooling water. Currently there are two important challenges regarding the use of waste heat recovery (WHR) technologies associated with ICE: (i) What is the best technology to recovery waste heat from an economic point of view? (ii) What is the optimal configuration and the best operating parameters of the most suitable technology? In this work is carried out thermoeconomic optimization of three different WHR superstructures: Organic Rankine Cycle (ORC), Kalina Cycle (KALINA) and Conventional Rankine Cycle (CRC). During the optimization process of each superstructure, both structural and parametric variables are optimized simultaneously, and after the process are defined the optimal configuration and the best operating parameters of each WHR superstructure, allowing the evaluation and selection of the WHR technology more economically feasible for an ICE. The thermoeconomic optimization problem as well as the thermodynamic and thermoeconomic modelling are formulated and solved with the EES Software, using a stochastic method. After evaluation and comparisons of the optimization results of each WHR superstructure, the ORC technology has the lowest total cost and highest net power, resulting in highest gross profit due to additional electric energy sale.
Keywords
Thermal Systems Design, Waste Heat Recovery (WHR), Superstructure, Thermoeconomic Optimization, Organic Rankine Cycle, Kalina cycle, Conventional Rankine Cycle, Internal combustion engine
