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In the coal industry, understanding the different properties of coal is essential to ensure the efficiency of its application. The analysis of coal not only involves its chemical composition, but also includes physical and mechanical properties, and the content of fixed carbon is an important indicator for evaluating coal coke production.
The change in fixed carbon content is directly related to the quality and use potential of coal, making it a key parameter in coal quality analysis.
Chemical Characteristics of Coal
Coal is mainly divided into four types: lignite, bituminous coal, anthracite and graphite. The physical parameters of various types of coal are affected by a variety of factors, especially moisture, volatile components and carbon content. These chemical properties directly affect the use of coal, including steelmaking, power generation and other industrial applications.
Moisture
Moisture occupies an important position in the properties of coal. The moisture in coal mines may be divided into soluble moisture and internal moisture. Soluble moisture is usually water present on the coal surface, while internal moisture is stored in the coal structure, and specific data on this moisture content are usually determined by various test methods.
Volatile fraction
In coal analysis, volatile components refer to components emitted when isolated from air at high temperatures. The content of volatile components usually shows the combustion properties of coal and its potential after becoming coke. As the coal grade continues to increase, the volatile branch will decrease accordingly.
Ash
The non-combust residues remaining after coal combustion, also known as ash, can help evaluate the quality of coal. Ash analysis is usually quite straightforward because it is a mineral substance left after coal burns, and analyzing ash helps understand the chemical structure and potential applications of coal.
Fixed Carbon
Fixed carbon refers to the remaining carbon content in the coal after the volatile substance is driven away. Unlike the final carbon content of coal, some carbon may be lost in volatiles when calculated by fixed carbon, which means that the data of fixed carbon provides an important indicator of the coking potential of coal.
Fixed carbon is often used as an indicator to predict how much coke can be produced from coal samples, making it an important reference in coke production.
Physical and mechanical properties of coal
Relative density
The relative density or specific gravity of coal is affected by the grade of coal and mineral impurities. Understanding the density of different coal seams is crucial for resource conversion to reserves. The measurement of relative density is usually determined by the buoyancy of water.
Particle size distribution
The particle size distribution after crushing coal will vary depending on the coal grade, which directly affects the combustion efficiency and processing method of coal. Therefore, understanding the particle size before coal mining is essential for designing suitable milling machinery.
A proper particle size distribution can not only improve combustion efficiency, but also increase the sales value of coal.
Floating and sinking test
The floating and sinking test of coal can help determine the optimal coal washing particle size and separate coal particles of different relative densities to improve the coal quality and energy content. This process usually needs to be performed in a laboratory environment.
Special combustion test
Specific energy
The energy output of coal is measured by an explosion calories, which affects the application of coal in steam generation. Ensuring that coal can produce high energy output under efficient combustion is crucial to the choice of coal.
Gray Melting Point Test
The melting behavior of coal ash is another important indicator for coal selection. The melting point of ash in coal will affect the design of the boiler, and excessively high melting point will lead to equipment failures and a decrease in energy operation efficiency.
The melting behavior of ash in coal directly affects the operating efficiency and safety of the boiler, so ash melting point test cannot be ignored.
Classification of coal
International standards divide coal into different types according to the grade of coal. As the coal grade continues to increase, its carbon content also increases. This process is closely related to the geological history of coal, so choosing the right coal grade is crucial for its end use.
In the process of analyzing and testing coal, fixed carbon content is a key indicator, linking the mass of coal with its potential applications, further explaining the importance of fixed carbon in the coking process of coal. So, what new applications will be for fixed carbon in the future use of coal?
