Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
EVALUATION OF A KALINA CYCLE ON A BRAZILIAN FPSO TO RECOVERY WASTE HEAT AND A COMPARASION WITH AN ORC
Submission Author:
Antonio Alves de Moura Junior , MG
Co-Authors:
Carlos Eymel Campos Rodriguez, Cesar Adolfo Sotomonte, Thiago Gotelip Correa Veloso, Marco Antonio Nascimento, Christian Jeremi R. Coronado
Presenter: Antonio Alves de Moura Junior
doi://10.26678/ABCM.ENCIT2016.CIT2016-0671
Abstract
Recovery waste heat in any process is very important to reach the sustainable development. Through the First and the Second Law of Thermodynamics, it is possible to research the performance of waste heat recovery thermodynamic cycles. This research studies the Kalina cycle (KCS-34) with that point on a Brazilian FPSO - Floating Productions Storage Offloading. The one transforms thermal energy in shaft power. This cycle usually works with low and average heat sources because works with a mixture of ammonia-water that has low vaporization temperature. The concentration of the mixture is variable in different parts of the system to decrease the thermodynamic irreversibility and increase the global thermal efficiency of the FPSO. This work will apply the waste heat of the fourth stage’s CO2 Compression Unit as the heat source to rate the potential of the Kalina cycle to recovery heat. Lastly, it will be compared with an ORC – Organic Rankine Cycle that used the same source to compare the results. The commercial software Aspen HYSYS v8.6® is used, as a tool, to simulate the cycle and the activity coefficient model used is the non-random two-liquid (NRTL). The maximum power output gain together with the minimum area was obtained with the higher ammonia mass fraction, lower pinch point, higher terminal temperature differential and 4400kPa of the working pressure, but the cycle not showed a big production of shaft power. However, it can contribute to increase the efficiency of the compression process.
Keywords
Kalina cycle, Waste heat, FPSO, Kalina cycle, Waste heat, FPSO
