Green engine - the call of the new century.doc

无锡职业技术学院毕业设计说明书Green engine - the call of the new century Mankind will soon enter the 21st century, the worlds increasing demands for environmental protection, environment and energy for the deterioration of the situation, cars and pollution of the environment as the major energy consumption, concern has been the development of environmental pollution and the development prospects of a certain green vehicle engine, has become the worlds automotive companies with the development of hot spots. Because of resource distribution, different scientific and technological strength, and therefore, the development of green vehicle engine, has different type. The following are the various car companies introduced a number of green car engine 1, alcohol engine 60s, to the internal combustion engine exhaust purification, a number of countries on the low-pollution engines interested alcohols. Mainly refers to alcohol fuels methanol, ethanol, they all have the use, storage and transport characteristics of simplicity. Very rich source of methanol from coal, natural gas system check, and ethanol from sugar cane, starch plants, wild plants in the system check. Therefore, some developed countries of agricultural attaches particular importance to the development of ethanol fuel. As long as the existing gasoline engine may be burning achievements in transforming a little alcohol. At present, Japan, the United States, Brazil has to wait until the engine has developed alcohols. Alcohol fuel, there are some shortcomings; such as cold-start,and pieces of plastic and rubber parts, such as swelling and corrosion. It was also from the United States Department of Energys Argonne National Laboratory scientists study has established that, although the ethanol as an alternative fuel vehicle to reduce the HC and CO emissions, but also an increase of other pollutant emissions. Microsoft States United States Albuquerque, New Mexico City, a field study has established that the use of ethanol fuels lead to vehicle exhaust engine called acetaldehyde and nitric acid peroxidation (PAN) the increase in toxic substances acetaldehyde in the atmosphere The activity is much higher than ethanol. With the city over the other characteristics of the atmosphere resulting from the reaction of PAN. This toxic PAN once, if the conditions (especially temperature) appropriate to the air for many days, not only toxic to plants. But also for the people also have a strong eye irritant. This can be toxic airborne PAN. Argonne National Laboratory scientists believe that despite the pull of these pollutants are not generally controlled, but the alternative fuel in the settlement of the impact on air quality, they are to human health and the environment should be a cause of the potential impact of sufficient attention. Despite the existence of the above-mentioned shortcomings of alcohol, but with its own merits, perhaps the future will become a green fuel one. 资料来源：360毕业设计网 代写论文 2, natural gas engines Natural gas as fuel to the engine of more than 50 years of history. It can be said that natural gas engines of human development is a very mature technology. Natural gas resources from oil and gas fields and gas fields. In the face of the earth a lot of storage. Greatest advantage of natural gas engines are low emission pollution: CO is the gasoline engine into the 1 / 15, HC emissions from gasoline engine is 1 / 5, SO2 emissions from the gasoline engine is 1 / 10, CO2 emissions of the gasoline engine is the 4 / 5, In addition, the natural gas into engine lubricants will not cause dilution to extend engine life, the same can reduce the noise such as motor vehicles. In many countries around the world have used natural gas vehicle, in order to encourage the use of natural gas vehicle, some countries have also changed the natural gas vehicle fuel subsidies, it is believed that when all the filling stations petrol filling stations, the true meaning of the green car Time will come. 3, the hydrogen engine Hydrogen from the electrolysis of water, coal, oxygen and the preparation of large quantities of natural gas. As the water is inexhaustible. Therefore, it is considered an important future energy mix component. Hydrogen is one of the cleaner fuel, fuel water main, followed by the fuel in the air to form trace amounts of NOX, no air pollution, therefore, developed countries attach great importance to the hydrogen fuel. Hydrogen as fuel in car engines Institute has gone through a tortuous process of wasted into the research began from the 30s, but little progress has been made. The oil crisis of the 70s to the States to re-sounded the alarm, hydrogen was again of concern to people. At present, some of the worlds largest auto-known companies have developed their own hydrogen engine. However, it is necessary to promote the use of hydrogen fuel engine would also like to solve a series of technical problems: 1) You need to use hydrogen in the car to find effective and safe storage and transportation methods; 2) to find a large number of low-cost hydrogen production methods; 3) to solve the hydrogen fuel the supply system. However, from a long-term and development point of view, the most promising hydrogen engines. 4, water-fuel engine Water as fuel engine is not a myth, it is the working principle of the fuel in the engine aluminum tube containing a rotor, and aluminum at one end into the water and the other end into the rotor. When in aluminum and fed to between the rotor current, the aluminum in the water discharge, water breaks down into hydrogen and oxygen, then the gas into the combustion chamber, gas after driving force. Britain is now on probation with water such as fuel engine. 5, purification of the engine air pollution Honda claims to have developed a wonderful, moving to purify the polluted air in the engine. This code-named Z-LEV engine, with smoke can be sucked into the clean air into the exhaust, emissions which is the worlds most stringent standards of California, 1 / 10. 2.3L4-cylinder engine equipped with such a vehicle traveling in the high-smog areas, the emission of exhaust smoke concentration than in ambient air is even lower, which CO emissions per mile for 0.17 grams. To 0.02 grams of nitrogen oxides. Z-LEV engine using a catalyst, when the engine at low temperature, this engine also has computer-controlled combustion timing system, in order to improve fuel efficiency. Unimaginable 10 years ago this kind of zero-emission gasoline engine plans to put into operation within 2 years, it is conceivable that with the increasing promotion of environmental standards, grid, zero-emission engine that will certainly optimistic about the prospects. 6, liquid air engine The use of air-launched vehicle seems to be a very difficult to buy the idea, but recently Microsoft States United States the University of Washington researchers have developed a set of air motor technology used to promote the car. Air motor vehicle used to promote the technology. The principle of the air motor car is not complicated, it is separated from nitrogen in the air, and then through the low-temperature to 160 liquefied, liquid nitrogen has become the air motor fuel. Automotive engine air car tank with a similar network of thermal heat exchanger, when the liquid nitrogen through heat exchange, he will quickly become a case of hot gas, volume expansion in the moments up to 700 times. Nitrogen in the expansion, it could be the piston air motor driven, principle of gasoline as fuel when the role of the explosion, the researchers believe that the air engine cars than electric vehicle intended to identify more environmentally friendly. The reason is that there are toxic substances to create the battery and electric charge of the plant will need to seek to improve. In contrast, nitrogen from the atmosphere, non-toxic, and its production costs cheaper than refining gasoline. 7, rice husk sawdust engine Stivling Engine Corporation of Japan recently announced the successful development of a use of agricultural and forestry wastes such as rice husks or sawdust as fuel for new engines. This cylinder engine, the air in the repeated heating and cooling cycles to promote the piston, the traction of 5 horsepower, 3 kilowatts power generators, due to the use of waste fuel, it is very low running costs and will not pollute the atmosphere. The new engine and the working principle of the existing internal combustion engines are totally different. Gasification fuel internal combustion engine, fuel combustion in the engine exploded. The new burning