Tier III technology development and its influence on ship installation and operation
The new emission regulations for marine diesel engines require that new engines fulfil substantially lower NOx emission limits after January 2016, when operated inside so-called ’Emission Control Areas’ (ECA), whereas, outside these regions, the emission limits applicable since the beginning of 2011 remain in force. Moreover, Tier III for the first time is not only limiting the cycle average value but includes additional constraints for the emission levels at the individual points of the test cycle. As a consequence, engines need to be optimized for both sets of requirements, using technologies that can be activated when entering an ECA in order to allow reducing NOx emissions by about 75% throughout the part of the operating range corresponding to the test cycle. This paper will elaborate on results from testing of different technology options for fulfilling the Tier III NOx emissions on medium-speed and low-speed engines including SCR, EGR, wet methods, and natural gas operation. Strengths and weaknesses of each technology, in respect of fulfilling the demands as well as regarding implications on engine efficiency, etc., will be presented. Special focus will be put on the challenges found with combination of different technologies needed for reaching the low emission limit and increasing the flexibility to switch the engine operation between emission modes. Furthermore the best choice of technology for fulfilling Tier III limits on some selected ship applications will be discussed. Additional space demand vs. need of eventual new consumables will be compared from both cost and operational point of view. Also aspects regarding influence of ship operation and route as well as implications on the installation due to the additional equipments will be taken into account and analysed for finding the most optimum choice of technology.
Christer Wik
W(a)rtsil(a),Research and Development,FINLAND
国际会议
上海
英文
1-11
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）