On the Possibilities of Using Secondary Energy Resources in Marine Engine

Abstract

The article is devoted to one of the most important problems of modern power engineering is to improve the efficiency of fuel utilization, characterized by energy efficient motors. Traditional methods of improving energy efficiency are the use of secondary energy resources (heat) of the exhaust gas of engines and heat transfer for their cooling systems. The article presents the results of calculations of power efficiency of utilization of the turbine, working under direct Rankine cycle using different coolants. The basic reserve of increase of power efficiency of thermal engines is the rational use of secondary energy resources.To assess the prospects of using secondary energy resources heat transfer fluids (coolants) cooling systems the calculation of the heat pump, working on the reverse Rankine cycle. Based on the results of the calculations in the article the conclusion about the prospects of using these devices, including the replacement of Autonomous boilers in ship power plants. The article also contains proposals for use of alternative types of secondary energy resources, such as the mechanical energy of a fuel and its gladatorial. The article shows that the use of these energy resources seems to be promising when using gas fuel. This research is relevant in connection with active introduction of gas and gas-diesel engines in various sectors of energy and transport. The data obtained in the result of the research show that the use of secondary energy resources heat engines using the utilization of turbines and heat pumps of modern design is promising and allows to increase the rate of fuel consumption of piston and gas turbine engines. When using gaseous fuels have the additional possibility of using secondary energy resources.

Use of the exergy method to assess the energy efficiency of technical facilities

“…Comparative evaluations of secondary energy resources of heat engines using energetic and exergic analysis methods are presented in [31].…”

Use of LNG Cold Potential in the Cogeneration Cycle of Ship Power Plants

“…Cogeneration is a procedure that uses primary energy introduced in a process to produce electric power and thermal energy from secondary energy sources, i.e., exhaust gas and cooling circuits, in the same technological system [44]. Compared with other possibilities of improving the EEDI, secondary utilization of the main engine energy is crucial to increasing energy efficiency [45][46][47].…”

“…Progress in further improving the fuel economy of modern main marine engines [46,49,50] has contributed to the further development of efficient heat recovery systems. In particular, owing to the low temperature of the exhaust gases, which is insufficient to generate steam to the turbogenerator, the Rankine system with low boiling liquids (R141b, R123, R245f, etc.)…”

“…For LNG-powered vehicles, the LNG cold potential, which consists of the amount of heat energy required to vaporize the LNG and heat the NG from storage temperature to engine-supply temperature, is added. In the cogeneration systems used, the physical NG energy is not utilized, i.e., the mechanical energy generated by throttling compressed natural gas (CNG) and the cold potential released by heating the gas to the supply temperature [46].…”