During the combustion process, the carbon in the fossil fuel is converted into carbon dioxide into the atmosphere, which increases the concentration of carbon dioxide in the atmosphere. Carbon dioxide, as a greenhouse gas, has the function of heat absorption and heat insulation. The result of its increase in the atmosphere is the formation of an invisible glass cover, so that the heat radiated by the sun to the earth cannot diverge in the outer space. As a result, the earth's surface becomes hot and the greenhouse effect is aggravated. Since the industrial revolution, despite the use of fossil fuels, the productivity of human society has greatly increased, but it has caused a series of serious problems such as global warming, and has gradually attracted the attention of countries all over the world. Fossil fuels are also called fossil fuels and ore fuels. Refers to the change of animal and plant remains in different geological ages in buried strata through a long period of geological conditions, as well as a class of combustible minerals formed by the action of temperature, pressure and microorganisms. All fossil fuels are made up of hydrocarbons, so they emit carbon dioxide when burned. The main sources of anthropogenic carbon dioxide emissions are fossil fuel combustion for energy production and transportation.
Due to the large scale of exploitation and utilization of fossil fuels, the environmental impact is also of concern. Classification of fossil fuels Fossil fuels can be classified into gaseous fuels (such as natural gas), liquid fuels (such as petroleum), and solid fuels (such as coal, oil shale, oil sands, etc.). Among them, coal, oil and natural gas are the most widely used, and they are also the main source of carbon dioxide. Coal coal is a buried underground plant that is affected by underground and geothermal heat. After tens of millions of years or even hundreds of millions of years of carbonization, it releases water, carbon dioxide, methane and other gases, and the oxygen content is reduced. Due to different geological conditions and degrees of evolution, the amount of carbon is different, so the calorific value is different. It is divided into anthracite, bituminous coal and lignite according to the order of calorific value. Coal is widely distributed on the earth and does not concentrate on a certain place of origin. Coal is a mixture of organic matter, mainly carbon, followed by hydrogen, oxygen, nitrogen and sulfur. Because of the high carbon content, coal combustion emits a lot of carbon dioxide. For example, according to the calculation of relevant units, China's coal fuel emissions account for more than 80% of the carbon dioxide emissions from fossil fuels, accounting for more than half of China's total greenhouse gases, fully demonstrating the prominent position of coal combustion in greenhouse gas and carbon dioxide emissions.
Petroleum, also called crude oil, is a hydrocarbon residue that accumulates in water and forms hydrocarbons under the action of high pressure. Petroleum is a flammable, viscous liquid that often coexists with natural gas and is a very complex mixture. After the oil is refined, it can be obtained from gasoline, kerosene, diesel and heavy oil. The nature of its oil varies from place to place, and the density, viscosity, and freezing point vary widely. For example, the freezing point is as high as 30 ° C, and some as low as -66 ° C. The main element in oil is carbon, which accounts for 83% to 87%, resulting in large-scale emissions of carbon dioxide. In addition, petroleum also contains 11% to 14% hydrogen, as well as a small amount of sulfur (0.06% to 8%), nitrogen (0.02% to 1.7%), oxygen (0.08% to 1.8%) and trace metals (nickel, Vanadium, iron, copper, etc.
Currently, many oil companies are using a technology that injects carbon dioxide into the reservoir to increase oil recovery. This technology stores the collected carbon dioxide in a waste oil and gas field, deep underground salt water and coal seams by compression. When carbon dioxide is mixed with crude oil, the viscosity of the crude oil will be weakened and it will be easier to flow to the ground. In this way, not only the reduction of carbon dioxide emissions, but also the production of oil. Natural Gas In a broad sense, natural gas refers to the general term for gases that are naturally buried in the formation. However, the so-called natural gas refers only to the flammable gas (gaseous fossil fuel) stored in the deeper part of the stratum and the gas coexisting with petroleum (commonly referred to as oilfield associated gas). The main component of natural gas is methane. In addition, according to different geological conditions, different amounts of low-carbon alkanes such as ethane, propane, butane, pentane, and hexane, and non-hydrocarbons such as carbon dioxide, nitrogen, hydrogen, and sulfides are also contained. Some gas fields also contain helium. Compared with coal and oil, natural gas is a clean and environmentally friendly high-quality energy source. When natural gas is burned, it produces 60% lower carbon dioxide.
The use of natural gas as a fuel can reduce the amount of coal and oil used, thus greatly improving environmental pollution. In addition, because natural gas contains almost no sulfur, dust and other harmful substances, it can reduce sulfur dioxide and dust emissions by nearly 100% and reduce nitrogen oxide emissions by 50%, which helps to reduce the formation of acid rain and soothe the global warming effect. Natural gas is also one of the safer gas. It does not contain carbon monoxide and is lighter than air. Once it leaks, it will spread upwards immediately, and it will not accumulate to form explosive gas, which is safe.
Industrial sectional doors are the most durable and longest lasting doors to ensure circulation at the areas of the factory entrance and exit of goods, loading and unloading areas.
The body of sectional door is forming by 40 mm sandwich panels. These panels provides sound and heat insulation due to the intense doped polyurethane insulation was injected between galvanized steel sheet. (50 kg/m3).
Industrial sectional door systems provide space-saving with opening parallel to the ceiling.Any opening can be used clearly . and produces in accordance with the transition range and the height in the factory buildings or warehouses.
Doors is working sliding by be the most appropriate the gap between the top level of the gate with a ceiling height within the side rasils. The door can be mounted in different ways according to the gap distance (standard, low, highlift and vertical track systems).
Industrial sectional doors can easily be opened automaticly by 230-380 V-AC/50 Hz electric motor or manualy thanks to torsion spring system that balances the weight of the door.The galvanized springs are made to be durable of 25.000 door cycles.Motor with emergency chain All the drive systems have a mechanical back-up system fitted to the reduction gearbox of the electric motor, so that the sectional door can be opened if the power fails. The reduction gearbox can then be powered using the chain.
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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfautodoors.com