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Information × Registration Number 0218U005271, 0116U008670 , R & D reports Title Development of technology for improving the efficiency of smaller vessels power plants by using alcohol fuels popup.stage_title Head Mitrofanov Аleksandr Sergeevich, Registration Date 15-08-2018 Organization National university of Shipbuilding named after admiral Makarov popup.description2 The object of the study are the processes that occur in the EC of low-tonnage vessels using alcoholic fuels, namely, the processes of energy conversion in the engine and the TCS system of exhaust gases.The aim of the study is to increase the efficiency of the power plant of small tonnage vessels using alcoholic fuels by rationally organizing the working process of the engine with TCS exhaust gas; determining the influence of the composition of synthesis gas on the main parameters of the engine cycle; determination of the rational relationship between the parameters of the internal combustion engine operating process and the operating parameters of the thermochemical heat recovery system that will provide acceptable specific fuel consumption, engine power and its environmental friendliness under given operating conditions. Methods of research and equipment. Methods of mathematical modeling. Theoretical and practical results: 1. It has been established that the mass addition of synthesis gas to ethanol (1 ... 10%) makes it possible to significantly improve the combustion process, while increasing the indicator efficiency of the engine and reducing the specific indicator fuel consumption by 11.7%. The addition of synthesis gas makes it possible to increase the air excess ratio ? to 1.2 without reducing the combustion rate of the fuel-air mixture, which in turn leads to a decrease in the thermal losses from exhaust gas, a decrease in the exhaust gas temperature, and also reduces emissions of toxic substances into the atmosphere.2. The presence of hydrogen in the composition of synthesis gas improves the motor properties of the air-fuel mixture, namely it allows to spend much less energy for ignition of the mixture (0.23 MJ), which improves the engine start (especially in winter). Depending on the amount of synthesis gas additive 1 ... 10% to ethanol, the total combustion time of the mixture ?z decreases, which is in the range of 33 ... 60? (for example, at 10% synthesis gas addition ?z is reduced by 45% . 3. For piston ICEs with forced ignition, working on ethanol with synthesis gas additives, when using thermal exhaust gas heat treatment, it is effective to use the decomposition reaction of ethanol, which has low energy characteristics of the chemical transformation process. Reduction of ethanol consumption is achieved at conversion rates of 30 ... 100% and is 1 ... 12% depending on the engine load. The rational difference in temperatures at the inlet to the recycling device has a significant effect on the efficiency of the application of TCU heat of exhaust gas. The range of operation of piston ICEs with positive ignition at a temperature difference of 20 K is in the range 26 ... 100% of the rated load, at 260 K - 94 ... 98%.4. The use of catalysts to reduce the temperature of the reaction of conversion increases the efficiency of the use of TCU of heat of exhaust gas in the internal combustion engine with forced ignition. The decrease in the temperature of the conversion reaction significantly widens the limits of the values of the temperature difference at the inlet to the utilization device, at which the specific consumption of ethanol is reduced. When the conversion temperature is reduced by 50 K, the upper limit of the temperature difference at the entrance to the recycling device T increases by 1.23 times, by 100 K - by 1.46 times. The minimum value of power at which the specific consumption of ethanol is reduced for the difference in temperatures at the inlet to the utilization device of 160 ... 260 K, with a decrease in the conversion temperature by 50 ... 100 K, is reduced by 1.3 ... 2.6 times. Novelty: For the first time, a study was made of the influence of the parameters of the operation of power plants of small tonnage vessels, based on ICE with TCU EG, on the efficiency of using alcohol fuels. The ways and methods of increasing the efficiency of the engine with the TCU system are determined. Practical recommendations for tuning the main parameters of the ICE and the system of thermochemical utilization of the heat of exhaust gases have been developed. Possible ranges for the operation of the EG SHU system as part of power plants for small tonnage vessels using alcoholic fuels are determined. Efficiency of implementation: It was implemented in ChAO Chernomornsudnoproject and Motor-Plus LLC. Product Description popup.authors А. С. Познанський А. Ю. Проскурін Д. В. Довгань Д. О. Шалапко Ю. М. Галинкін popup.nrat_date 2020-04-02 Close