Abstract
Waste-heat recovery (WHR) systems based on the organic Rankine cycle (ORC) improve the thermal efficiency of natural gas engines because they generate additional electric power without consuming more gas fuel. However, to obtain a cost-effective design, thermoeconomic criteria must be considered to facilitate installation, operation, and penetration into real industrial contexts. Therefore, a thermo-economic analyses of a simple ORC (SORC), ORC with recuperator (RORC) and a double-pressure ORC (DORC) integrated with a 2 MW Jenbacher JMS 612 GS-N. L is presented using toluene as the organic working fluid. In addition, the cost rate balances for each system are presented in detail, with the analysis of some thermoeconomics indicator such as the relative cost difference, the exergoeconomic factor, and the cost rates of exergy destruction and exergy loss. The results reported opportunities to improve the thermoeconomic performance in the condenser and turbine, because the exergoeconomic factor for the condenser and the turbine were in the RORC (0.41 and 0.90), and DORC (0.99 and 0.99) respectively, which implies for the RORC configuration that 59% and 10% of the increase of the total cost of the system is caused by the exergy destruction of these devices. Also, the pumps present the higher values of relative cost difference and exergoeconomic factor for B1 (rk = 8.5, fk = 80%), B2 (rk = 8, fk = 85%).
Highlights
Energy efficiency is seen as a promising technology for reducing energy-generation costs and has become the best hope for controlling climate change [1,2]
The cost rates associated with the exergy values of the streams of Waste-heat recovery (WHR) systems are presented in turbine, which is the device to produce power is determined to be 3.23·10−3 USD/s, 4.43·10−3 USD/s and 2.89·10−3 USD/s for ENGINE/simple ORC (SORC), ENGINE/recuperator recuperator (RORC) and ENGINE/double-pressure ORC (DORC), respectively
The allowed study allowed an energetic and exergetic analysis three energy-generation systems based on organic Rankine cycle (ORC), recovery for waste-heat fromgases the exhaust gasesgeneration of a 2 MWengine generation engine using
Summary
Energy efficiency is seen as a promising technology for reducing energy-generation costs and has become the best hope for controlling climate change [1,2]. It is necessary to propose methodologies for the rational use of energy in waste-heat recovery systems (WHRS) in stationary generation engines, which are widely used in the industrial sector [3,4]. The thermal efficiency enhancement of industrial engine requires a cost-effective thermal design of WHRS configurations. The total investment costs have been evaluated for the suggested. Total investment capital (TCI) has been studied in some research results, involving the operation and maintenance (O&M) costs, but the heat source is a thermal oil without taking into account the thermal conditions of the engine exhaust gases [7]
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