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Anonymous users2024-02-121. Coal is a layer of extremely thick black humus accumulated on the ground by the branches, leaves and rhizomes of plants for millions of years, which is continuously buried in the ground due to changes in the earth's crust, isolated from the air for a long time, and formed by a series of complex physical and chemical changes and other factors under high temperature and high pressure.
This is how coal is formed.
2. The thickness of the coal seam in a coal mine is related to the rate of crustal decline and the amount of plant remains accumulated in the area. The crust descends quickly, and the plant remains accumulate thickly, and the coal seam of this coal mine is thick, and conversely, the crust descends slowly, and the plant remains accumulate thinly, and the coal seam of this coal mine is thin.
Coal is formed by the accumulation and burial of plant remains and then transformed into coal. Coal formation can be divided into two major stages:
The first stage is the process of transforming plant remains accumulated in stagnant water bodies into peat or saprolite under normal temperature and pressure on the surface through peat or saprolite. This stage is dominated by biochemical degradation.
In the second stage, peat or saprolite is buried deep and then turned into lignite by diagenesis.
When the temperature and pressure increase, it becomes bituminous coal and anthracite through metamorphism.
The second stage is dominated by physicochemical changes.
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Anonymous users2024-02-11Coal is a sedimentary organic mineral formed by the transformation of plant remains through biochemical and physicochemical processes. That is, the branches and leaves and rhizomes of plants, accumulated on the ground to form a layer of extremely thick black humus, due to the changes of the earth's crust are constantly buried in the ground, isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rock, this is the formation process of coal.
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Anonymous users2024-02-10Due to crustal fluctuations, these plants are constantly buried in the ground, and because they are isolated from the air for a long time, they do not completely decompose, but form organic layers underground.
After the action of high temperature and high pressure, these organic layers undergo a series of complex physical and chemical changes, and finally form a black coal seam, which is the formation process of coal.
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Anonymous users2024-02-09Coal is the result of a systematic evolution of plant remains
Coal is a layer of extremely thick black humus accumulated on the ground by the branches and roots of plants for millions of years, which is continuously buried in the ground due to changes in the earth's crust, isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rock, which is the formation process of coal.
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Anonymous users2024-02-08Coal is a layer of extremely thick black humus accumulated on the ground by the branches and roots of plants for millions of years, which is continuously buried in the ground due to changes in the earth's crust, isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rock, which is the formation process of coal.
The main uses of coal are:
1. Coal for power generation: about 1 3 more than 1 3 coal in China is used for power generation, and the current average coal consumption for power generation is 370g (kWh.) of standard coalAround. Power plants use the calorific value of coal to convert thermal energy into electricity.
2. Domestic coal: The amount of domestic coal is also large, accounting for about 20% of the fuel coal.
3. Coal for building materials: accounting for more than l0% of power coal, with cement using the largest amount of coal, followed by glass, bricks, tiles, etc.
4. Coal for general industrial boilers: In addition to thermal power plants and large-scale heating boilers, there are many types of industrial boilers used in general enterprises and heating, which are large and scattered, and the coal consumption accounts for about 30% of thermal coal.
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Anonymous users2024-02-07Summary. Hello dear! I'm glad to be there for you, and I'll take care of your questions!
For you to find out how coal is formed, the specific information is: coal is a layer of extremely thick black humus accumulated on the ground by the branches and roots of plants for millions of years, due to the changes of the earth's crust constantly buried in the ground, isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rock. This is how coal is formed.
Hello dear! I'm glad to be there for you, and I'll take care of your questions! For you to find out how coal is formed, the specific information is:
Coal is a layer of extremely thick black humus accumulated on the ground by the branches, leaves and rhizomes of plants for millions of years, which is continuously buried in the ground due to the changes in the earth's crust, isolated from the air for a long time, and formed by a series of complex physical and chemical changes and other factors under high temperature and high pressure. This is the process of the formation of coal.
In the whole geological epoch, there are three major coal-forming periods in the world: 1. In the Carboniferous and Permian of the Paleozoic Era, coal-forming plants were mainly robe plants. The main types of coal are bituminous coal and anthracite.
2. In the Cenozoic and Cretaceous, coal-forming plants are mainly gymnosperms. The main types of coal are lignite and bituminous coal. 3. In the Tertiary period of the Cenozoic Era, coal-forming plants were mainly angiosperms.
The main type of coal is lignite, followed by peat, and there is also some young bituminous coal.
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