Thermal Coal Processing And Mining Equipment
Thermal coal is coal used to generate electricity.
There are three types of energy conversion processes in thermal power plants:
1. the chemical energy of coal is converted into heat energy in the boiler;
2. In a steam turbine, thermal energy is transformed into mechanical energy;
3. Mechanical energy is converted into electrical energy in a generator.
The main equipment for energy conversion — boiler, steam turbine and generator, is known as the three main engines of thermal power plants, and the boiler is the most basic energy conversion equipment among the three main engines.
The pulverized coal used for boiler combustion is an irregular fine coal particle which is ground into coal by the coal mill. Specifically, the coal is ground into powder and burned in the boiler of a thermal power plant. The water in the boiler absorbs heat and turns it into steam of certain parameters to drive the steam turbine, which drives the generator to generate electricity and is used for generating electricity, so it is called electric coal.
The average particle size is 0.05-0.01mm, and the particle size below 20~50μm (micron) accounts for the vast majority.
Because pulverized coal particles are very small and the surface is very large, it can absorb a lot of air, and it has the properties of general solids – fluidity.
The preparation of pulverized coal refers to the process of processing raw coal into pulverized coal with particle size and moisture content in line with the requirements of blast furnace coal injection.
The requirements of blast furnace injection system for pulverized coal are: particle size less than 74μm accounts for more than 80%, moisture is not more than 1%.
The volatilization of coal carbon is the primary index to determine the ignition characteristics of coal.
The higher the volatile content, the easier it is to catch fire.
According to the boiler design requirements, the value of volatile coal supply should not change too much, otherwise it will affect the normal operation of the boiler.
The ash content of coal will make the flame propagation speed decrease, the ignition time delay, the combustion is not stable, and the furnace temperature drops.
Moisture is one of the harmful substances in the process of coal combustion. It absorbs a lot of heat in the process of evaporation and has a much greater impact on combustion than ash.
The calorific value of coal is an important basis for boiler design.
Because the power plant pulverized coal has strong adaptability to coal, so long as the calorific value of coal is roughly consistent with the design requirements of the boiler.
Sulphur is a harmful impurity in coal. Although it has no effect on the combustion itself, its content is too high, and the corrosion of equipment and pollution of the environment are quite serious.
Therefore, the sulfur content of coal burning in power plants can not be too high, generally the highest requirement can not exceed 2.5%.
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