What's the difference between ethanol gasoline and regular gasoline?

Ethanol gasoline is a new alternative energy source, which takes grains and various plant fibers as raw materials and is mixed with ordinary gasoline in a certain proportion. According to China's national standards, ethanol gasoline is a mixture of 90% ordinary gasoline and 10% fuel ethanol. As a clean engine fuel oil, vehicle ethanol gasoline has the following advantages: 1, high octane number and good antiknock performance. 2. The oxygen content of ethanol is as high as 34.7%. When gasoline contains 10% ethanol, the oxygen content can reach 3.5%. 3. The use of ethanol gasoline for vehicles can effectively reduce automobile exhaust emissions and improve energy structure. Domestic research shows that compared with unleaded gasoline, E 15 ethanol gasoline (ethanol content in gasoline is 15%) reduces carbon and hydrocarbon emissions by 16.2% and carbon monoxide emissions by 30%. 4. Fuel ethanol production is rich in resources and mature in technology. When the blending ratio of gasoline is less than 10%, ethanol gasoline can be directly used without any major changes to the existing automobile engine. The disadvantages of automobile ethanol gasoline in combustion value, power and corrosion resistance: 1, and the calorific value of ethanol is 60% of that of conventional automobile gasoline. According to relevant data, if the car uses mixed gasoline containing 65,438+00% ethanol without any changes, the fuel consumption of the engine will increase by 5%. 2. The latent heat of vaporization of ethanol is high, and the vaporization temperature under the theoretical air-fuel ratio is higher than that of conventional gasoline. It affects the formation of mixture and combustion speed, which leads to the decline of automobile power, economy and cold start, which is not conducive to automobile acceleration. 3. Ethanol will produce acetic acid during combustion, which is corrosive to automobile metals, especially copper. Relevant tests show that when the ethanol content in gasoline is 0 ~ 10%, there is basically no corrosion to metals, but when the ethanol content exceeds 15%, an effective corrosion inhibitor must be added. 4. Ethanol is an excellent solvent, which is easy to slightly corrode, swell, soften or crack automobile sealing rubber and other synthetic nonmetallic materials. Ethanol is easily absorbed by water. When the water content of automobile ethanol gasoline exceeds the standard index, it is easy to cause liquid phase separation. The main disadvantage (1) is that the latent heat of evaporation of ethanol is more than twice that of gasoline, which will deteriorate the low-temperature start-up and low-temperature operation performance of ethanol fuel. If the engine is not equipped with an intake air preheating system, it will be difficult for the vehicle to start when burning all-alcohol fuel, but the gasoline is mixed with a low proportion of alcohol. The heat of vaporization of liquid ethanol is provided by the combustion chamber wall and the latent heat of evaporation is high, which can be a favorable factor for improving the thermal efficiency of the engine and cooling the engine. (2) The calorific value of low calorific value ethanol is only 665,438+0% of that of gasoline. Running the same mileage requires more oil. Although the calorific value of ethanol is much less than that of gasoline, its theoretical calorific value of mixed gas is close to that of gasoline because of its high oxygen content. Therefore, ethanol can be used as gasoline fuel. In addition, its power performance can be close to that of an engine using gasoline. (3) The boiling point of ethanol, which is prone to gas resistance, is only 78. C%, and at the normal working temperature of the engine, it is easy to produce air resistance, which will reduce the oil supply and even interrupt the oil supply. (4) Corrosive metallic ethanol will produce acetic acid during combustion, which will corrode automobile metals, especially copper. Experiments show that when the ethanol content in gasoline is lower than 10%, there is basically no corrosion to metals, but when the ethanol content exceeds 15%, corrosion inhibitor must be added. (5) Poor adaptability to materials Ethanol is an excellent solvent, which is easy to slightly corrode, swell, soften or crack synthetic nonmetallic materials such as automobile sealing rubber. (6) Easy-to-stratify ethanol is easy to absorb water, and liquid phase separation is easy to occur when the water content of automobile ethanol gasoline exceeds the standard. Affect use. The storage and transportation cycle of automobile ethanol gasoline is only 4 ~ 5 days, so it is necessary to transform and build the oil storage tank, tanker and blending and refueling facilities of automobile ethanol gasoline. Main advantages (1) The oxygen content of ethanol gasoline for vehicles is reduced to 35%, which makes the fuel burn more fully. According to the results of engine bench test and driving test made by the National Automobile Research Center, the power performance of ethanol gasoline for vehicles is basically unchanged without modifying the engine, and the CO and HC compounds emitted by exhaust gas are reduced by more than 30% on average, effectively reducing and reducing the emission of harmful exhaust gas. (2) Good power and high octane number of ethanol (RON is11), so high compression ratio can be used to improve the thermal efficiency and power of the engine. In addition, its latent heat of evaporation can increase the air intake of the engine. Therefore, the dynamic performance of the engine is improved. (3) Carbon deposition reduces the combustion characteristics of ethanol vehicles, which can effectively eliminate the formation of carbon deposition in spark plugs, combustion chambers, valves and exhaust pipe silencers, avoid faults caused by carbon deposition, and prolong the service life of parts. (4) Easy to use, ethanol is liquid at room temperature, simple to operate, convenient to store and use, and has inheritance with the traditional engine technology, especially when using ethanol-gasoline mixed fuel. It has good cleaning effect, can effectively eliminate the precipitation and condensation of fuel impurities (especially colloid phenomenon) in automobile fuel tank and oil system, and has good oil channel dredging effect. (6) Rich resources The main raw materials for ethanol production in China are sugar crops, starch crops and fiber fuels, which are renewable resources with abundant sources. Therefore, the use of ethanol fuel can reduce the dependence of automobiles on petroleum resources, which is beneficial to China's energy security. /view/20205.htm？ fr=ala0_ 1_ 1