Currently, the emissions discharged by ships are becoming more and more serious, which brings a great harm to the atmospheric and marine environment. In order to solve the emissions, especially of CO2 emission, the new ship energy efficiency design index (EEDI) has been introduced to reduce it. According to EEDI calculation formula, the use of new energy technology can reduce marine EEDI. Nowadays, wind energy as a clean and renewable energy, is an ideal alternative energy to be applied on ships. But until now, there is still no definite calculation formula and value regulation to parameters involved in the application of new energy on ships, including new energy utilization coefficient.

NOx is one of the most serious atmosphere pollutants, and how to control and remove NOx is the hot research in the environmental field all over the world. SCR is considered as one of the most effective denitration methods at present. In SCR technology, catalyst is the core of the SCR system, and the performance of SCR catalyst mainly depends on the active component and catalyst support. Catalyst support can not only affect the choice of the active material and the catalyst promoter, but also affect the flue gas denitration efficiency. This paper mainly introduces four kinds of SCR catalyst supports: TiO2, Al2O3, activated carbon and activated carbon fiber and ZSM-5 zeolite. The performance of the four types of catalyst supports are compared, and SCR activity test of Mn-Ce supported and V2O5 supported on different catalyst supports are conducted respectively. Finally, for Mn-Ce supported and V2O5 supported catalysts, this paper puts forward that TiO2 is the most widely used and effective catalyst support.

Nowadays, due to the serious shortage of energy resource, the research and application of new alternative energy has become an important task for each country and government all over the world. In order to protect environment and raise the utilization of marine power, Maritime Environment Protection Committee (MEPC) of International Maritime Organization (IMO) encouraged ship operators to use new alternative energies to reduce marine CO2 emission. Currently, marine new energy technologies mainly include solar energy, wind energy, waste heat recovery and biological substitute fuel. Wind energy, as a clean and easy getting energy, has been paid a high attention to. This paper mainly introduces the basic features and calculation of wind energy, and then put forwards some shortcomings in the application of it on the ships.

Diesel engine is the main power of the marine vessel, its thermal efficiency is the highest in all thermodynamic engines, but still more than 50% of the energy is not being used, so making full use of the waste heat of the main diesel engine scientifically and effectively, not only reduce the fuel consumption and the shipping cost, but also reduce the value of the ship EEDI effectively. To be able to design and transform the green ship, thermodynamic analyzing of the ship power plant and master the energy utilization of each part is necessary. Raising the efficiency of an energy system is within the domain of thermodynamics. Raising the efficiency cost-effectively (thermo-economics) is a multi-disciplinary problem in which thermodynamics interfaces other disciplines of knowledge which in this particular case are design, manufacture and economics. In this paper, it introduces the analysis method of thermo-economics briefly, the thermal economic analysis of the marine diesel engine waste heat recovery system is taken based on matrix model thermo-economics, and the unit exergetic cost is calculated. Some thermal equipments of the system are showed with the result of the performance evaluation. The results shows that thermo-economics is a promising tool for the analysis of complex energy systems. This method also provides a great prospect for energy system optimizations.

This paper aimed on the effects of several technologies on engine NOx emission via simulation, an improved method to reduce engine NOx emission was obtained according the simulation results and was verified by engine test. The study uncovered that a retarded fuel injection timing would reduce engine NOx emission and make it below IMO limitation, while the penalty of fuel consumption is under tolerance of engine operator. The method adopted in this research can bring engine NOx emission under current IMO requirement, and this has been verified by engine test.