The combustion value of natural gas is large or the combustion value of liquefied gas is large

Liquefied petroleum gas (referred to as liquefied gas) is a kind of petroleum tail gas left in the process of refining gasoline, kerosene, diesel, heavy oil and other oil products. Its main components are ethylene, ethane, propylene, propane and butane, etc., which are liquid in the gas cylinder, and once they flow out, they will vaporize into combustible gas about 250 times larger than the original volume, and are very easy to diffuse, and will burn or ** when encountering an open flame. Therefore, special attention should also be paid to the use of liquefied gas.

Natural gas. In a broad sense, it is a general term for gases that are naturally formed in formations. However, the so-called natural gas usually refers to a hydrocarbon-rich combustible gas stored in the deeper part of the formation, while natural gas that coexists with oil is often called oilfield associated gas.

Natural gas is converted from organic matter hundreds of millions of years ago, and the main component is methane, in addition, according to different geological formation conditions, it also contains different amounts of low-carbon alkanes such as ethane, propane, butane, pentane, hexane, and non-hydrocarbon substances such as carbon dioxide, nitrogen, hydrogen, sulfides, etc.; Some gas fields also contain helium. Natural gas is an important energy source that is widely used as city gas and industrial fuel; In the 70s, natural gas accounted for about the world's energy consumption.

18％～19％。Natural gas is also an important chemical raw material.

The calorific value of natural gas combustion per cubic meter is 8000 kcal to 8500 kcal.

The calorific value of combustion per kilogram of liquefied gas is 11,000 kcal. The specific gravity of gaseous liquefied gas is kilogram cubic meters. The calorific value of combustion per cubic meter of liquefied gas is 25,200 kcal.

In this way, it can be seen that the calorific value of one cubic meter of liquefied gas is three times that of natural gas, but there are reports that the calorific value of liquefied gas is seven times that of natural gas.

The combustion value of LPG is about coul kilograms.

The combustion value of natural gas is about coul cubic meters.

Density of natural gas (gas):

g cm3 standard units.

Therefore, the calorific value of natural gas is about the size of liquefied petroleum gas. Fold.

The simplest answer.

Of course, the combustion value of natural gas is large

The main components of liquefied petroleum gas include propane, propylene, butane, isobutane, butene, isobutylene and other low molecular weights; The main components of the treated civil liquefied gas are propane, n-butane and isobutane, colorless gas or lime-colored oily liquid, and special odor. Liquefied petroleum gas is gaseous at normal pressure, with gaseous properties, and becomes liquid after cooling and pressurization, and the density increases. The flash point is -74, the ignition temperature is 426 537, and the **limit is 5%.

The liquid liquefied gas is more volatile, when there is liquid volatilization into gas, its volume expands by 250 300 times, its calorific value is large, the maximum combustion temperature can reach 1900, the volume expansion coefficient is about 10 16 times that of water, and the relative density is times that of air.

To make iron red, it's between 800 and 900.

The firepower of liquefied gas and natural gas is not the same. The firepower of natural gas is stronger, stronger and faster.

1. The difference between gases.

Natural gas is generally dry gas, mainly composed of methane, basically free of impurities, high calorific value, slow flame propagation speed, and high transmission pressure.

Coal gas is a mixture of various gases, containing impurities such as moisture, oil and dust, ammonia, hydrogen sulfide, etc., and the delivery pressure is low.

The difference between natural gas stove and gas stove: Usually the pressure of gas is large and the orifice diameter of the gas nozzle is small, while the pressure of natural gas is small and the aperture is large, so they cannot be mixed. In addition, when designing the stove, it is usually also concerned about the oxygen (combustion capacity, i.e. mixing ratio, LPG requires more air, and the other two are less.

2. Combustion value and pressure.

The working principle and shape of natural gas stove and gas stove are similar, the difference is that the orifice of the nozzle is different, we all know that the main reason is that the calorific value of natural gas and gas is different, and their pressure is different. Everyone should choose according to the needs of their own family.

The pressure of natural gas is 2800 Pa, and the pressure of pipeline gas is 2000 Pa. Piped gas stoves can be converted to natural gas stoves. This process requires changing the nozzle and fire lid of the stove.

The rest is handled by the gas company. The difference between a natural gas stove and a gas stove is not dangerous as long as it has been changed, but it is very dangerous to burn natural gas with a piped gas stove that has not been changed.

3. Combustion characteristics.

In terms of combustion characteristics, natural gas and coal gas are not interchangeable, so when gas is converted to natural gas, the original gas stoves, appliances, meters, and transmission and distribution pipeline networks must be replaced or transformed. Among them, artificial gas stoves should be transformed or updated to natural gas stoves, and household stoves should be transformed into natural gas stoves by replacing nozzles and fire hole covers. Household water heaters are converted into natural gas water heaters by replacing nozzle (main fire, permanent open flame, etc.) burners.

Which is better LNG or natural gas?

1. Liquefied gas is mainly short-chain alkanes, which is very harmful to the human body and basically will not be poisoned, while natural gas is mainly methane, which will produce carbon monoxide in the case of insufficient combustion, which has a certain threat to the human body. So of the two, natural gas is more likely to be poisoned.

2. Gas has a limit, and generally combustible gas is dispersed in the air to the limit, which is easy to cause once there is an open flame ignition. The lower line of the limit is higher and narrower, the safer, and the higher the upper limit of the limit will not. The ** limit of liquefied gas is about 5-15% of natural gas.

So of the two, liquefied gas is easier**.

The use of combustible gas is indispensable in family life. Because every household has to make a fire for cooking, gas becomes an important substance in the fire. In our daily use, we will find that some people use natural gas, some use liquefied gas, and some use coal gas.

So what is the difference between these three gases?

First of all, it is necessary to distinguish from the way of acquisition. Natural gas, as the name suggests, is a natural gas. This gas is a general term for the gas that is mostly mined in underground rock storage layers.

As we know, there are different levels underground, and there is a certain gap between these levels, and some underground gases are formed between the gaps. These gases are collected in a series to form a combustible gas that can be used;

Liquefied gas is obtained from petroleum, kerosene, fuel oil and other oil products, which will produce a lot of petroleum tail gas in the production process, which is refined into combustible gas that can be burned and provided with liquefied gas that can be supplied to residents;

Finally, let's talk about gas. Coal gas is processed from coal as raw material, and it is generally in the form of cans in life. In the user's home, if you see a can of cans, it is filled with gas.

Then there's the difference in ingredients. Natural gas is composed of methane, ethane, propane, or nitrogen. Its ingredients are of high purity, and during combustion, it is able to generate heat equivalent to liquefied gas per unit mass.

Because it burns sufficiently, the acquisition process does not require secondary processing, saves a lot of intermediate costs, and is safe to use, so it is often used in most residents' homes.

The main component of coal gas is carbon monoxide, as well as hydrogen and methane. Because it can be poisoned if it absorbs too much carbon monoxide, coal gas is the most dangerous of the three gases. Residents should also pay more attention to the process of use.

The main components of liquefied gas are butane, butylene, propylene, etc., which are of higher purity and are a colorless volatile flammable gas.

The difference in energy is that natural gas is a primary energy source, which burns more fully, does not need intermediate processing to obtain, and produces very little harmful gas after combustion, which is the safest and most suitable combustible gas for modern residents; Coal gas and liquefied gas are secondary energy sources, and there are more harmful gases produced after combustion, so people now use less and less coal gas and liquefied gas. Under the condition of conditions, people will choose natural gas to make domestic combustible gas, and the state also advocates the use of natural gas, so natural gas is better.

Since the amount of oxygen consumed when natural gas and coal gas are burned, the air intakes of natural gas stoves and gas stoves are not the same.

In terms of overall effect, it is almost the same, but there are differences in small aspects. In general, the firepower of liquefied gas can be kept stable, and the gas pressure of natural gas will be slightly reduced during the peak use, and the firepower will be correspondingly smaller.

The calorific value of a class of natural gas is 33 points, and the calorific value of liquefied gas is more than 110! Do you say the same? Liquefied gas can fry a dish in three minutes, and natural gas takes ten minutes, which can be said to be cooking, and it is very untasty!

The natural gas fire is weak, the cooking is really slow, the heating is still okay to cook, the chicken ribs.

Hello, it's pretty much the same!

The maximum combustion temperature of natural gas is generally 2300 oC, because the main component of natural gas is methane.

Natural gas uses air as an accelerant, and the theoretical combustion temperature can reach 2300;

If oxygen is used as an accelerant, the temperature is higher, and the combustion temperature of natural gas and catalytic additives in oxygen can reach 3400 degrees, which fully meets the cutting standard of industrial gas.

The flame temperature of the complete combustion of liquefied gas in oxygen is between 2200 and 2400On civil stoves, the burning temperature is between 1500 and 1900.

Liquefied petroleum gas (LPG) is a colorless volatile liquid obtained by pressurized cooling and liquefaction of natural gas or oil in an oil refinery. It is very susceptible to spontaneous combustion, and when its content in the air reaches a certain concentration range, it can meet an open flame.

The liquefied petroleum gas obtained by the refinery is mainly composed of one or two of propane, propylene, butane and butene, and it is also doped with a small amount of pentane, pentene and trace sulfide impurities. If the LPG is to be further purified, the carbon oxygen sulfide in it can be absorbed and removed by an alcohol amine absorption tower, and finally the excess sulfide can be washed away with alkali.

Chemical properties. It is composed of hydrocarbons, and the main components are propane, butane and other alkyl or alkenes. The combined percentage of propane plus butane is more than 60%, below which it cannot be called LPG. Each country has its own standards, and foreign oil companies are more particular about LPG, adjusting the ratio of propane and butane according to the seasons.

Domestic liquefied petroleum gas is mainly for household use, and has not taken into account the high-quality requirements of industrial needs, so the production of liquefied petroleum gas propane and butane content is low and has many impurities.

Natural gas has a large combustion value.

The combustion value is the calorific value, and the calorific value of each cubic meter of natural gas is about 8500 kcal; Liquefied gas generally refers to coal gas, and the calorific value of gas per unit volume is 3000 kcal.

Obviously, the combustion value of natural gas is larger.

The ignition point of liquefied gas is about 490-500 degrees Celsius.

However, in fact, the general ignition method is electric spark ignition (although the total energy seepage loss is not high, but the actual temperature can reach 3000 degrees), in addition, the engine red hot exhaust pipe can also be ignited.

Liquefied Gas Composition:

More: propane, butane.

Less: ethylene, propylene, ethane.

Butene, etc. Appearance and properties: colorless gas or yellow-brown oily liquid with special odor.

Density: LPG in liquid.

580kg cubic meters, gaseous density: per cubic meter.

Flash point ( ) 74

Ignition temperature ( ) 426 537

The combustion value of each cubic meter of gas is only more than 3,000 kcal.

The calorific value of natural gas per cubic meter is up to 8,500 kcal.

The combustion value per cubic meter of liquefied gas is 10,000 kcal.

The calorific value of natural gas is 35,544 kilojoules cubic meters. **For yuan per cubic meter (2017 Fujian**). According to the cubic conversion, that is, a ton of natural gas has 1390 cubic meters to calculate 35544.

The calorific value of each yuan can be purchased is 35,544 kilojoules.

Content from the user: Fly**.

Natural gas, liquefied petroleum gas.

The main component of natural gas is methane, and CH4 natural gas (natural gas) is also known as oilfield gas, petroleum gas, and petroleum associated gas. When oil is extracted, only the gas is called natural gas; Petroleum and petroleum gas, this petroleum gas is called oilfield gas or petroleum associated gas. The chemical composition and physicochemical properties of natural gas vary from place to place, the main component is methane, but also contains small amounts of ethane, butane, pentane, carbon dioxide, carbon monoxide, hydrogen sulfide, etc.

When hydrogen sulfide is free, it is a colorless, odorless, flammable and explosive gas, with a density and lighter than air. Dry gas with more than 90% methane content and moisture gas with less than 90% methane content are usually referred to as dry gas.

Natural gas exists in nature and is exploited and utilized. Natural gas is mainly found in oilfield gas, gas field gas, coalbed methane, mud volcanic gas and biogenerated gas, and a small amount also comes from coal seams. The main component of natural gas is methane, which is produced by chemical changes of ancient animals stored in underground rock formations, and is the best gaseous fuel that is collected by drilling and transported to users by pipelines.

LPG is artificially pressurized. Liquefied petroleum gas is a petrochemical product, and in petroleum fractionation is a light component gas that is liquefied under pressure at room temperature, and the main component is carbon 4, (butane), which becomes liquefied petroleum gas. Liquefied gas is generally bottled in separate bottles, which is a common gas tank.

There is also centralized decompression gasification, which is distributed to the family with pipelines, which may be the case in the landlord's home.

Natural gas exists in nature and is exploited and utilized. Natural gas is mainly found in oilfield gas, gas field gas, coalbed methane, mud volcanic gas and biogenerated gas, and a small amount also comes from coal seams. Natural gas can be divided into two types: associated gas and non-associated gas.

Accompanied by symbiosis, the oilfield gas that is produced at the same time as ** is called associated gas.