Browsing by Author "Granqvist, Sanna"

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  • Energikällor för framtidens handelssjöfart
    (2019-12-12) Granqvist, Sanna
     Insinööritieteiden korkeakoulu | Bachelor's thesis
  • Implementation of methanol fuel to expedition cruise ship
    (2022-08-22) Granqvist, Sanna
     Insinööritieteiden korkeakoulu | Master's thesis
    The maritime industry is going through a phase where new technologies and solutions are investigated, aiming for better energy efficiency and reduction of emissions; this is due to set targets driving for more sustainable and cleaner transport. To comply with these targets, measurements regarding energy efficiency are introduced. One solution for the reduction of emissions is implementing alternative fuels, whereas hydrogen, ammonia, and methanol are currently investigated in the industry. The choice of alternative fuel is driven by technical, environmental, and economic objectives. The feasibility of implementing methanol in expedition cruise ships is evaluated by studying the required systems, changes in general arrangement, effects on emissions, and energy efficiency measures (EEDI and CII) based on the ship's operational profile and investigating expected costs. The main change regarding systems is the increase in tank capacity due to the energy density of methanol. The increase in tank capacity will mean an increase in the ship's weight. Thus, changes are needed, the amount of fuel or tanks could be optimized, design draught could be changed with further stability evaluation or removal of steel structures affecting the number of cabins. Some reductions in emissions, especially SOx, NOx, and PM, are expected. The change in CO2 emissions will vary depending on the fuel's production pathway and used feedstocks. Thus, renewable fuels should be used for a significant reduction. Future scenarios were MDO, and methanol could be blended with corresponding renewable fuel were evaluated, showing that already a part of renewable fuel would reduce the carbon content to the necessary level. Several engine and system manufacturers are currently developing products suitable for use with methanol. An increase in price can be expected when methanol systems are implemented. The fuel costs of bio- and e-methanol are expected to be more affordable over time.