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[Visitor (112.21.*.*)]answers [Chinese ]Time :2022-05-21
In the 20th and 21st centuries, fossil fuels are potentially plagued by an energy shortage crisis, especially gasoline extracted from oil, which is a cause of the global oil crisis. At present, there is a global trend towards the development of renewable energy and nuclear energy, which can help increase the global energy demand.

The continuous burning of fossil fuels by human beings emits carbon dioxide (one of the main sources of greenhouse gases) is one of the factors accelerating global warming. In addition, the carbon dioxide component in biofuels comes from the atmosphere, so the development of biofuels can reduce carbon dioxide in the atmosphere, because reliable cultivation reduces the amount of carbon dioxide, thereby reducing the low temperature chamber effect.
Until now, almost all the fuels used in countries around the world have been fossil fuels, namely oil, natural gas and coal. Fossil fuels that have undergone millions of years of gradual formation may be completely depleted by humans within a few hundred years. According to observations and studies, there is no coal or oil forming underground today. Oil, also known as crude oil, is a yellow to black flammable viscous liquid, often coexisting with natural gas, is a very complex mixture. The properties of petroleum vary according to the place of origin, the density, viscosity and freezing point vary greatly, for example, the freezing point is as high as 30 °C, some are as low as -66 °C. The calorific value is from 43.7 ~ 46.2 MJ / kg. The main elements in oil are carbon and hydrogen, accounting for 83 to 87% and 11 to 14% respectively..In addition, it contains a small amount of sulfur (0.06~8%), nitrogen (0.02~1.7%), oxygen (0.08~1.8%), and trace metal elements (nickel, vanadium, iron, copper). Natural gas, in a broad sense, refers to the general term for naturally occurring gases buried in formations. However, natural gas usually refers to only combustible gases (gaseous fossil fuels) stored deep in the formation and gases coexisting with oil (often called oilfield associated gas). In addition, according to different geological conditions, it also contains different quantities of low-carbon alkanes such as ethane, propane, butane, pentane, hexane, and non-hydrocarbon substances such as carbon dioxide, nitrogen, hydrogen, and sulfide. Some gas fields also contain helium.Natural gas with a high methane content is called dry gas, and natural gas with a high content of two or more carbon atoms alkanes is called moisture. China's Sichuan Zigong is rich in natural gas. Coal is also called coal and it is a solid flammable mineral buried in the ground. Coal is a mixture without a single molecular structure, and after long-term research by scientists, there has been an introduction to the ordinary type of coal structure. The structure of coal has a large number of carbon atom rings, some of which are fused with each other, and some of which are bonded to form long chains. The more common is W.H. Wüizer's bituminous coal structure model, but none of them can reveal the physical structure of coal. The organic matter elements in coal are mainly carbon, followed by hydrogen, as well as oxygen, nitrogen and sulfur and other elements...

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