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Experiences from use of some techniques to reduce emissions from ships
Profu has, in collaboration with IVL, investigated the experiences from use of some techniques to reduce emissions from ships.
Low-emission combustion technique has been an issue since the 1970s for stationary, as well as mobile sources. Sulphur emissions are directly proportional to the sulphur content in the fuel and emissions reductions can consequently be achieved by changing to a fuel with less sulphur. Also exhaust gas treatment is, however, a technique used to reduce sulphur dioxide emissions. To reduce emissions of nitrogen oxides either the combustion conditions must be changed or the exhaust gases must be treated. Many of the techniques used influence the formation of nitrogen oxides emission by lowering the combustion temperature.
A number of effective techniques are presently available to reduce nitrogen oxides emissions from ships. Control techniques developed and tested at power plants and industries have since more than two decades also been tested and used to reduce emissions from large marine engines. During the latest decade some of the techniques tested have become more or less commercial. Many of the new ships presently produced in ship-yards over the world are equipped with nitrogen oxides emission reduction units or prepared for later installation of control equipment.
The report is elaborated with the aim of showing the possibilities available today for reducing emissions and the experiences gained during daily operation of different equipments to reduce emissions from ships. The experiences gained has been collected via contacts with ship owners, companies chartering the ships and ship crew, but also via published reports and data from manufacturers of reduction equipment. The report provides a summary of the most commonly used techniques, associated costs and experienced benefits and disadvantages.
För mer information kontakta Ebba Löfblad, telefon 031 - 720 83 73 eller via mail: ebba.lofblad@profu.se.
