Abstract
The goal of this research is to study a cogeneration plant for combined heat & power (CHP) production that utilises the low-temperature waste energy in the power plant of a Suezmax-size oil tanker for all heating and electricity requirements during navigation. After considering various configurations, a standard propulsion engine operating at maximum efficiency and a CHP Plant with R245fa fluid using a supercritical organic Rankine cycle (ORC) is selected. All the ship heat requirements can be covered by energy of organic fluid after expansion in the turbine, except feeder-booster heating. Hence, an additional quantity of working fluid may be heated using an after Heat Recovery Steam Generator (HRSG) directed to the feeder-booster module. An analysis of the obtained results shows that the steam turbine plant does not yield significant fuel savings. However, a CHP plant with R245fa fluid using supercritical ORC meets all of the demands for electrical energy and heat while burning only a small amount of additional fuel in HRSG at the main engine off-design operation.
Highlights
The potential uses for waste heat and other forms of low quality energy produced during power production have been investigated for decades, but low fuel prices and high equipment costs have made these solutions economically unattractive
The exhaust gas composition was calculated precisely including the NOx, particle and SO2, the following mass molar composition was entered in the National Institute of Standards and Technology (NIST) program: 0.147748 O2, 0.758649 N2, 0.03768 CO2, 0.046118 H2O, 0.008934 Ar and 0.0008734 C6H14 what was calculated composition at
This exhaust gas composition is very close to MAN data [43,44] which corresponds to 100% specified maximum continuous rating (SMCR)
Summary
The potential uses for waste heat and other forms of low quality energy produced during power production have been investigated for decades, but low fuel prices and high equipment costs have made these solutions economically unattractive. One of the primary reasons for the high cost of power production using low temperature sources is the low available efficiency, which is typically 10% or lower. Emissions have become very important on the global scale. Exhaust emissions originating from land transport and electricity generation are already strongly restricted, resulting in considerably reduced emissions. Worldwide shipping consumes 5% of the total oil consumed [1,2], which amounts to global NOx emission of approximately 12.57 Mt/y and global SOx emission of approximately 10.54 Mt/y [1].
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