3.85 yuan/liter for 93#
90# 3.65 yuan/liter
Introduction to nouns:
ethanol gasoline
Basic introduction
Ethanol is a renewable energy source, which is made from sorghum, corn and potatoes by fermentation. It does not affect the driving performance of the car, and also reduces the emission of harmful gases. As a new clean fuel, ethanol gasoline is the development focus of renewable energy in the world at present, which is in line with China's energy substitution strategy and the development direction of renewable energy. The technology is mature, safe and reliable, which is completely applicable to China and has good economic and social benefits. Ethanol gasoline is a mixture, not a new compound. Adding proper amount of ethanol into gasoline as automobile fuel can save petroleum resources, reduce air pollution caused by automobile exhaust and promote agricultural production.
Development history
As early as the 1920s, Brazil began to use ethanol gasoline. Because Brazil is short of oil resources, but rich in sugarcane resources, a set of technologies for producing sucrose and alcohol from sugarcane has been formed. At present, Brazil is the first country in the world where the ethanol content in ethanol gasoline reaches 20%.
The United States is another big consumer of fuel ethanol in the world. Ethanol gasoline was first marketed in Nebraska in the 1930s. 1978 gasoline (E 10 gasoline) containing 10% ethanol is widely used in Nebraska. Since then, the federal government of the United States has implemented tax reduction or exemption for E 10 gasoline, and the fuel ethanol output has rapidly increased from 30,000 tons in 1979 to 2.69 million tons in 1990. In 2000, the output of fuel ethanol in the United States reached 5 million tons. With the decrease of MTBE usage in the United States and its final ban, fuel ethanol will become the best substitute for MTBE oxygenates. It is estimated that by 2004, the demand for fuel ethanol in the United States will reach100000 tons.
At present, the proportion of ethanol gasoline in gasoline sales in most provinces and cities in China is high, and it is still increasing. However, due to the problems of raw materials, cost and technology, China also encountered some obstacles in promoting ethanol gasoline. Later, due to policy support and technological progress, the promotion of ethanol gasoline was carried out smoothly.
Matters needing attention
Self-cleaning characteristic
Ethanol in vehicle ethanol gasoline is an excellent organic solvent with strong dissolution and cleaning characteristics. Experienced drivers and maintenance personnel often clean carburetors with ethanol. The carburetor cleaned in this way is clean and thorough. Similarly, ethanol gasoline can also be used for automobiles.
Clean the oil circuit and keep it unblocked. However, when the vehicle uses ethanol gasoline for the first time, especially after using 1-2 fuel tank oil, under the cleaning effect of ethanol gasoline, various impurities will be deposited and accumulated in the fuel tank and oil circuit (the longer the time, the more impurities will be accumulated. Especially iron oil tanks), such as rust, dirt, colloidal particles, etc. It is softened, dissolved and mixed into oil. These impurities may cause poor oil flow.
Suggestion: When the vehicle uses ethanol gasoline for the first time, it is best to clean the main components of the vehicle fuel tank and oil circuit, such as fuel filter and carburetor. Ensure the cleanliness of all components of the fuel system.
hydrophilia
Vehicle ethanol gasoline is mixed with a certain amount of denatured fuel ethanol, which is a hydrophilic liquid and easily miscible with water. Unlike gasoline, gasoline can be separated from water, and water is deposited at the bottom of the fuel tank. Therefore, when the vehicle uses ethanol gasoline for the first time, it should check the fuel tank to prevent ethanol gasoline from dissolving with the precipitation water that may exist at the bottom of the fuel tank, so that the water in the engine oil exceeds the standard and affects the normal operation of the engine.
Suggestion: Although this situation is rare, it cannot be ignored.
Pay attention to using ethanol gasoline in summer.
A Check that the intake and exhaust valves of the fuel tank are not unblocked: the high ambient temperature in summer increases the volatility of fuel. For example, the exhaust valve, an accessory of the fuel tank, is blocked, and part of the fuel is converted from liquid to gas, and the gas cannot be discharged through the exhaust valve, which easily leads to an increase in the probability of gas resistance in the oil circuit (the same is true for ordinary gasoline).
B For vehicles using ethanol gasoline, don't fill the fuel tank too full when refueling in summer, and leave some room for oil expansion.
C If you go to a place where there is no ethanol gasoline, ethanol gasoline and regular gasoline can be mixed at will.
Does ethanol gasoline affect rubber adaptability?
The test shows that most rubber parts can adapt to ethanol gasoline. Only a few kinds are not suitable, but the corrosion is slow. In the pilot project, it was found that the rubber diaphragm in the early mechanical gasoline pump had poor adaptability, and some cracks appeared after using ethanol gasoline. Because the rubber parts can't distinguish the material composition in appearance, the purchased parts can be soaked in ethanol gasoline for vehicles in advance by the designated garage, and then loaded for use.
Because ethanol gasoline has not been fully used, there are many other precautions, such as careful debugging when using it for the first time to see if the engine is too abnormal; Long-term use should consider whether the rubber and organic parts in the oil supply system are resistant to alcohol corrosion, and so on.
Related advantages
reduce harmful emissions
The oxygen content of automobile ethanol gasoline is 35%, which makes the fuel burn more fully. According to the engine bench test and driving test carried out 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 harmful exhaust gas emissions.
Good dynamic performance
When the methane value of ethanol is high (RON is 1 1 1), high compression ratio can be used to improve the thermal efficiency and power performance of the engine. In addition, its latent heat of evaporation can increase the air intake of the engine, thus improving the dynamic performance of the engine.
Reduce carbon deposition
Due to the combustion characteristics of ethanol vehicles, the formation of carbon deposits in spark plugs, combustion chambers, valves and exhaust silencers can be effectively eliminated, the faults caused by carbon deposits can be avoided, and the service life of parts can be prolonged.
convenient to use
Ethanol is a liquid at room temperature, which is simple to operate and convenient to store, transport and use. It inherits the traditional engine technology, especially when using ethanol-gasoline mixed fuel, the engine structure has little change.
Self-cleaning of fuel system
Ethanol added to ethanol gasoline for vehicles is an excellent organic solvent. 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.
Rich resources
The main raw materials for ethanol production in China are sugar crops, starch crops and fiber fuel, 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.
Related shortcomings
lower heating value
The energy of the same volume of ethanol is only 2/3 of that of gasoline. When it is mixed with gasoline, it actually reduces the heat content of fuel. Therefore, a full tank of gasoline with ethanol can only drive less mileage.
Huge evaporation potential
The latent heat of evaporation of ethanol is more than twice that of gasoline, and high latent heat of evaporation will worsen the low-temperature start-up and low-temperature operation performance of ethanol fuel. If the engine is not equipped with air intake preheating system, it will be difficult for the car to start when burning all-alcohol fuel. However, mixing a low proportion of alcohol with gasoline and supplying liquid ethanol with heat of vaporization from the combustion chamber wall can be favorable factors for improving thermal efficiency and cooling the engine.
It is easy to produce air resistance.
The boiling point of ethanol is only 78. C%。 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.
corrode metal
Acetic acid will be produced during the combustion of ethanol, which will corrode automobile metals, especially copper. Experiments show that when the ethanol content in gasoline is lower than 10%, it will not corrode metals, but when the ethanol content exceeds 15%, a better corrosion inhibitor must be added.
Poor adaptability to materials
Ethanol is an excellent solvent, which is easy to slightly corrode, swell, soften or crack automobile sealing rubber and other synthetic nonmetallic materials.
Easy stratification
Ethanol is easy to absorb water, and when the water content of ethanol gasoline exceeds the standard index, it is easy to precipitate liquid phase, which affects the use.
Not "clean energy"
The fossil energy consumption of agricultural machinery, fertilizer, transportation, ethanol processing and other links involved in ethanol production is 29% higher than that provided by ethanol itself, so ethanol gasoline can not be regarded as clean energy, nor can it reduce carbon emissions.