What can coal do? From where?

1, coal gasification

Coal gasification can be used to produce synthesis gas, which is a mixture of carbon monoxide (CO) and hydrogen (H2). Syngas is usually used for combustion in gas turbines to generate electricity, but its universality also allows it to be converted into transportation fuels such as gasoline and diesel by Fischer-Tropsch synthesis process. Sasol Chemical Company in South Africa uses coal gasification combined with Fischer-Tropsch technology to produce automobile fuel from coal and natural gas.

2, coal water slurry

Coal water slurry fuel is a combustible mixture of pulverized coal particles suspended in water. It is a low-pollution, efficient and pipeline-transportable coal-based fluid fuel, which contains about 65% coal, 34% water and 65,438+0% additives. It changed the traditional way of burning coal and showed great advantages of environmental protection and energy saving. Especially in recent years, after adopting the technical route of waste reuse, the environmental protection coal water slurry has been successfully developed, which can greatly improve the environmental protection benefit of coal water slurry without increasing the cost. It can be used to power boilers, gas turbines, diesel engines, heating and power stations.

3. Production of chemical products

Coal is an important raw material for producing many fertilizers and other chemical products. The main way to produce these products is to produce synthesis gas by coal gasification. The primary chemical products directly produced from synthesis gas include methanol, hydrogen and carbon monoxide, which are the basic components of chemical products, from which a full range of chemical products can be continuously produced, including olefins, acetic acid, formaldehyde, ammonia, urea and so on. As the precursor of primary chemicals and high-value derivatives, the versatility of syngas provides a new choice for producing various high-value commodities using relatively cheap coal.

4. Utilization of coking coal and coke

As an important raw material for ironmaking, coke plays a key role in the quality of pig iron. If the content of sulfur and phosphorus is high, the quality of pig iron will be seriously reduced, and the high ash content will reduce the calorific value. Therefore, the coal used for coking must be washed to reduce its ash and sulfur content. Coke must be large and solid, and cannot be crushed in the blast furnace, so that it can be ventilated. The selected broken coke can only be used as fuel, and it is a good fuel with high calorific value and no smoke.

5. Utilization of coking coal and coke

As an important raw material for ironmaking, coke plays a key role in the quality of pig iron. If the content of sulfur and phosphorus is high, the quality of pig iron will be seriously reduced, and the high ash content will reduce the calorific value. Therefore, the coal used for coking must be washed to reduce its ash and sulfur content. Coke must be large and solid, and cannot be crushed in the blast furnace, so that it can be ventilated. The selected broken coke can only be used as fuel, and it is a good fuel with high calorific value and no smoke.

Coal mining method:

Bituminous coal and anthracite are mostly obtained by deep mining method, while modern technology can adopt open-pit mining method. The open-pit mining method requires the use of a large excavator, which can remove hundreds of metric tons per hour to remove the surface soil layer hundreds of feet deep. Although the cost is lower and the excavation speed is faster, it will destroy the environmental landscape. The depth of deep coal mining method is usually several hundred feet to several thousand feet, and several vertical shafts are usually needed as roadway ventilation to extract methane and reduce the heat and humidity inside the mine. At present, more than 90% of coal fields are mined and transported by mechanical means, so the transportation in the roadway mainly depends on conveyor belts, which transport coal to vertical wells and then to the ground for cleaning and sorting.

Extended data:

1, eliminate coal

Shut down existing coal-fired power plants and prohibit new coal-fired power plants. The aim is to reduce the emission of high-concentration greenhouse gases that will lead to climate change.

2. Formation thinness of coal mine

The thickness of coal seam in coal mine is related to the speed of crustal decline and the accumulation of plant residues in this area. The earth's crust is falling rapidly and the plant remains are piled thick, so the coal seam in this coal mine is thick. On the contrary, the earth's crust is slowly falling, and the plant remains are piled very thin, so the coal seam of this coal mine is very thin.

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