If it is used as a fuel for a car, on the whole, diesel is better or alcohol

In terms of calorific value, diesel is diesel, diesel is an organic matter of C 16--- C 18, while alcohol has only two carbons, CH3CH2OH. And alcohol is too volatile.

Therefore, high-power trucks run on diesel instead of gasoline. Moreover, the compression ratio of diesel is relatively high, higher than that of gasoline and kerosene. Generally speaking, the higher the compression ratio of the engine, the more power the car has, the more combustion it has, and of course the less emissions it discharges.

In terms of **, the difference between diesel and alcohol blends is not very large.

In conclusion, alcohol and diesel are not the same uses.

The calorific value of alcohol is very low, and I haven't heard of its compression ratio, so I don't think it has too much power, so it is generally not used in engines.

But if you overcome the technical difficulties, alcohol will have very little pollution and is an absolutely good fuel.

Diesel is 3470 yuan per ton, fuel ethanol ** 4500 yuan tons, ethanol combustion efficiency is higher than diesel, equipment requirements Ethanol mixed with gasoline can be directly used on ordinary cars, I think it should be good alcohol, diesel efficiency is low, and there are many harmful substances produced.

Not sure if a fuel blend is better? If the fuel mixture is burned more fully in terms of combustion alone, but if the requirements of the engine are even higher, the engine is a key problem, and the exhaust gas filter device helps to reduce the exhaust pollution to a certain level.

As long as there is a technological breakthrough, the efficacy of alcohol is far higher than that of diesel.

Because the flash point is not the same, the flash point refers to the temperature at which the fire is ignited at the lowest temperature. The flash point of gasoline is between -50 20 degrees. The flash point of diesel fuel is also different depending on the freezing point.

According to the National VI standard, the flash point of 0 diesel is 60 degrees.

Flash point is also a key factor in oil detection. The flash point is too high, and it is not easy to start in winter. It is easy to accumulate carbon in the cylinder. If the gasoline is too low, it is easy to burst the cylinder.

Important properties of gasoline:

1. Evaporation.

Gasoline in the engine cylinder must be quickly vaporized and form a homogeneous flammable mixture with air, which is mainly determined by the evaporation of gasoline itself. The main indicators that reflect evaporability are the distillation range and the saturation vapor pressure.

2. Stability.

The ability of gasoline to resist oxidation under normal temperature and liquid phase conditions is called the oxidative stability of gasoline, or stability for short. The indicators to evaluate the stability of gasoline are divided into iodine value, actual gum content, and induction period. Refers to the ability of gasoline to resist knock combustion under various conditions of use.

3. Anti-explosion.

The property that measures whether a fuel is prone to knocking is called knock resistance, and gasoline knock resistance is expressed by the octane number (RON). The higher the octane number of gasoline, the better the knock resistance.

4. Corrosive.

Gasoline corrosiveness is related to sulfur and sulfur-containing compounds, organic acids, water-soluble acids or bases.

5. Cleanliness.

Gasoline often contains mechanical impurities and moisture. Mechanical impurities can cause serious consequences such as oil circuit blockage and increased wear. Water mixed into gasoline will accelerate the oxidation of gasoline, and form an acidic aqueous solution with low-water molecular organic acids in gasoline to corrode metals, and it is easy to freeze and form ice particles at low temperatures to block the oil circuit.

Therefore, the mixing of mechanical impurities and water should be strictly controlled in vehicle gasoline.

The flash point of diesel fuel is about 52 °C, the autoignition temperature is 256 °C, and the flash point of gasoline is -38 °C, and the autoignition temperature is 210 °C, which is the lowest temperature at which a liquid is vaporized and ignited under specified test conditions. Flash ignition is a phenomenon in which sufficient vapor is produced on the surface of the liquid and mixed with air to form a flammable gas, and a short-term fire is produced when it encounters the ignition source, and it is extinguished in a flash. The lowest temperature at which a flash ignites is called the flash point.

Among them, the flash point of gasoline is about 90°C lower than that of diesel, which is much better than that of diesel.

The autoignition temperature is also higher for diesel than for gasoline. The fundamental reason is that diesel has a large molecular weight, so it is not easy to volatile. And only volatilization can form a ** mixture.

Gasoline and diesel are both mixtures, and gasoline is basically a hydrocarbon (alkane) that is refined from petroleum. The products from petroleum fractionation are obtained in the order of hydrocarbon groups from short to long (high to low evaporation), probably natural gas, lighter gas, liquefied petroleum gas, gasoline, kerosene, diesel, heavy oil, asphalt, etc. Since oxygen in the air only accounts for 21%, the carbon content is too high, and the combustion will be incomplete, and the carbon content of gasoline is smaller than that of diesel, and the combustion is better than that of diesel.

Hydrogen has a higher ignition point than aluminum, but hydrogen is extremely flammable, while aluminum is difficult to burn.

Flash point, ignition point, spontaneous ignition point.

Petrol 28 427 510--530

Kerosene 28--45 80 84 380--425

Light diesel 45--120 220 350--380

Heavy diesel oil 120 220 300--330

Alcohol should not be added to diesel.

The main components of diesel are organic matter with large molecular weight, and the molecular weight of ethanol is too small to be combusted, but it will catalyze the addition of methanol, which is toxic, so ethanol cannot be added to diesel.

The addition of ethanol to gasoline has been more common, whether it is Europe, China or the United States, some provinces and cities in our country use E10 (ethanol ratio is 10, because the cost of ethanol gasoline is high, although it is very environmentally friendly, there are high technical requirements, we all know that ethanol gasoline is used in food.

In order to be completely miscible, the alcohol (ethanol) must be modified, if it is methanol, you will see stratification, because the hydroxyl group is insoluble in organic matter, the reason why ethanol seems to be miscible is because it also has a methyl group, this miscibility is very slow, and the molecular dispersion is not very uniform, if you are experimenting with ethanol diesel or biodiesel, I suggest that you must modify the ethanol, otherwise your product will not be promoted in the market, there are already ethanol modifiers on the market, you can look for it.

Who said diesel fuel is not easily ignited. Your diesel is lubricated, not pure diesel, and of course it's not good outside. You buy some pure diesel without lubricating oil. It is as flammable as gasoline.

The definition of ignition point refers to the temperature at which it is heated in a container until it burns, also known as the spontaneous ignition point. In this sense, diesel has a low ignition point.

The ignition point of diesel is 220 and the ignition point of gasoline is 427. Diesel fuel is more susceptible to spontaneous combustion than gasoline, but it is less likely to ignite because diesel has poor evaporation.

It mainly depends on the volatility of the fuel.

Alcohol has a short carbon chain and a low hydrocarbon content.

Therefore, the calorific value is not as good as that of gasoline with advanced fatty hydrocarbons, and the advantage is that it contains oxygen, so the combustion is more sufficient than gasoline, which can reduce the harm of exhaust gas, but the ignition point of pure alcohol is very low, 75 degrees Celsius, so when working directly in the gasoline engine, it will lead to spontaneous combustion during the compression stroke, so that it cannot work normally at all. The existing ethanol gasoline is composed of a part of ethanol added to ordinary gasoline.

If the gasoline engine uses diesel, it is easy to cause unstable operation, reduce thermal efficiency, and the diesel carbon chain is long, which is more likely to burn inadequately in the gasoline engine, and the exhaust pollution is heavier.

The calorific value of ethanol is not as low as that of gasoline.

Gasoline engines and diesel fuel cannot be burned completely.

Now there is ethanol gasoline.

The calorific value of ethanol is not higher than that of gasoline, and a lot of ethanol is required to start a car.

Because diesel has a higher ignition point than gasoline.

The ignition point of gasoline is too low and it is difficult to control it when the piston is not at the apex, because the combustion principle of gasoline and diesel engines is different, the gasoline engine is ignition type, and the diesel engine is compression ignition. The gasoline used in the former has light distillate, volatile, high spontaneous ignition point and high octane number; The vehicle diesel has a heavy fraction, low spontaneous ignition point, low octane number, high cetane number, and if it is used in a gasoline engine, the octane number is too low, and it is easy to produce detonation. The distillate is heavy, and the burning sediment and carbon deposits are too heavy.

If it is used in a diesel engine, the spontaneous ignition point is high, the cetane number is too low, it is not easy to compress ignition, it is easy to produce detonation, and the engine is damaged.

In the coming years, ethanol will be rolled out across the country. So, what are the advantages of ethanol gasoline bending to sell? What are the benefits and benefits of using ethanol gasoline? I'll tell you below.

First of all, ethanol is a very good solvent and has a very good cleaning effect. It has a good cleaning effect on the oil circuit and the carbon deposit of the liquid fuel injector. It has its own cleaning function. Ethanol will deposit less carbon than regular gasoline.

Secondly, ethanol gasoline burns more fully than ordinary gasoline, combusts carbon monoxide and hydrocarbons more fully, releases more heat energy to compensate for power loss, makes the ignition advance angle larger, and the engine power output is more stable.

Thirdly, China's oil reserves are very small. The development of ethanol fuel could reduce dependence on imported oil and make it more environmentally friendly.

Hello, I'm glad for your question, diesel can be directly dissolved in alcohol, but diesel can not be added to the jujube essence, so mixed, the main components of diesel are organic matter with large molecular weight, the main component of alcohol ethanol molecule is too small, there is no way to combine combustion, but the old rock group catalyzes methanol, adding methanol is toxic, so ethanol can not be added to diesel.