What are the three major energy sources in the world?

Coal Another name: Coal is a solid combustible mineral gradually formed by ancient plants buried underground and undergoing complex biochemical and physicochemical changes.

A kind of solid combustible organic rock, which is mainly formed by biochemical reactions of plant remains and then transformed by geological processes after burial.

Commonly known as coal.

China is the first country in the world to utilize coal.

Coal-made handicrafts have been found at Xinle Ancient Cultural Site in Liaoning Province, and sites using coal cakes to make iron during the Western Han Dynasty have also been discovered in Gongyi City, Henan Province.

In "The Classic of Mountains and Seas", coal is called stone nirvana. In the Wei and Jin Dynasties, coal was called graphite or coal.

The name coal was used for the first time in Li Shizhen's "Compendium of Materia Medica" in the Ming Dynasty.

Greece and ancient Rome were also early adopters of coal. The Greek scholar Theophrastus wrote "History of Stone" about 300 BC, which recorded the nature and origin of coal; ancient Rome about 2,000 years ago

Heating with coal has begun.

Coal is a mineral that can be used as fuel or as an industrial raw material.

It is a black solid mineral composed of carbon, hydrogen, oxygen, nitrogen and other elements that changes the physical and chemical properties of ancient plants through biochemical and geological processes.

Coal has been used as a fuel as early as 800 years ago.

Coal has been widely used as a fuel for industrial production, starting with the Industrial Revolution at the end of the 18th century.

With the invention and use of steam engines, coal was widely used as fuel for industrial production, bringing unprecedented productivity to society and promoting the development of industry. With this, coal, steel, chemicals, mining, and metallurgy developed.

and other industries.

Coal has high calorific value, and the calorific value of standard coal is 7000 kcal/kg.

Moreover, coal has abundant reserves on the earth, is widely distributed, and is generally relatively easy to mine, so it is widely used as fuel in various industrial productions.

In addition to being used as fuel to obtain heat and kinetic energy, coal is more important for producing coke for metallurgy and artificial petroleum, that is, coal tar, a liquid product of low-temperature carbonization of coal.

Thousands of chemical products can be produced from coal after chemical processing, so it is also a very important chemical raw material. For example, quite a few medium and small nitrogen fertilizer plants in my country use coal as raw material to produce chemical fertilizers.

Coal in my country is widely used as raw material for various industries.

The construction of large-scale coal industry bases plays a great role in the formation and development of my country's comprehensive industrial bases and economic regions.

In addition, coal often contains many radioactive and rare elements such as uranium, germanium, gallium, etc. These radioactive and rare elements are important raw materials for the semiconductor and atomic energy industries.

Coal plays an important role in modern industry, whether it is heavy industry or light industry; whether it is energy industry, metallurgical industry, chemical industry, machinery industry, light textile industry, food industry, transportation industry, various industries

All departments consume a certain amount of coal to a certain extent, so some people call coal the "real food" of industry.

Our country is one of the countries with the richest coal resources in the world. It not only has large reserves and wide distribution, but also has complete types and excellent coal quality, which provides extremely favorable conditions for my country's industrial modernization.

Petroleum Petroleum, also known as crude oil, is a brown-black flammable viscous liquid extracted from deep underground.

Mainly a mixture of various alkanes, cycloalkanes, and aromatic hydrocarbons.

It is a mixture formed by organisms in ancient oceans or lakes over a long period of evolution, and is a fossil fuel like coal.

Natural gas Natural gas is a multi-component mixed gas. The main components are alkanes, of which methane accounts for the majority, and there are small amounts of ethane, propane and butane. In addition, it generally contains hydrogen sulfide, carbon dioxide, nitrogen and water gas.

and trace amounts of inert gases such as helium and argon.

Under standard conditions, methane to butane exist in a gaseous state, and pentane and above are liquids.

Natural gas is a gaseous hydrocarbon produced by the slow transformation, metamorphism and cracking of paleontological remains that have been deposited underground for a long time. They are flammable and are often released when crude oil is extracted from oil fields.

Natural gas is contained in underground porous rock formations. Its main component is methane, with a specific gravity of 0.65. It is lighter than air and is colorless, odorless and non-toxic.

Natural gas companies comply with government regulations by adding odorant (tetrahydrothiophene) to allow users to smell and identify it.

If the concentration of natural gas in the air is within the range of 5% to 15%, it will explode when exposed to an open flame. This concentration range is the explosion limit of natural gas.

The explosion generates high pressure and high temperature in an instant, which is very destructive and dangerous.