Deep Water Cooled ORC for Offshore Floating Oil Platform Applications

Year 2017, Volume: 20 Issue: 4, 229 - 237, 29.11.2017

C. G. F. Do Val J. A. M. Silva S. Oliveira Jr.

https://doi.org/10.5541/eoguijt.359499

Cited By: 7

Abstract

Due to global warming, environmental
pollution and cost reduction, increasing efficiency of electricity conversion
has become a key issue for the offshore market. This paper proposes an Organic
Rankine Cycle (ORC), which uses heat waste from exhaust gases of an FPSO
(Floating, Production, Storage and Offloading unit) as heating source, and deep
ocean water as cooling source. A genetic algorithm optimization was conducted
targeting maximization of net power output, by taking in to consideration of 23
working fluids. Expander inlet temperature and pressure were set as independent
variables. The analysis encompasses subcritical or supercritical conditions and
recuperation was included in a second version of the system as an option. The
first configuration presented ethanol as optimal fluid, followed by toluene and
the second configuration indicated cyclohexane followed by ethanol. Use of
recuperation, when feasible, increased power output specially for cycles
operating with dry and isentropic fluids, presenting an average contribution of
22.7%. Net power and efficiency results from ORC using deep sea water in
condenser were presented and compared with ORC using shallow ocean water as
cooling source and with Carnot efficiency operating under the same
temperatures. Use of deep water raised net power output by 23.3% (cyclohexane recuperative
ORC) and 12.5% (ethanol non-recuperative ORC) for the optimal configurations.

Keywords

ORC; deep water; FPSO; power generation

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