Generation of floating beads in power plant
With the development of society, people pay more and more attention to the floating beads of power plants. How much do you know about the floating beads of power plants? Follow the small make-up to understand the power plant drift bead production process.
The formation of floating beads is related to the type of coal, coal quality, combustion temperature, combustion mode and other factors. For example, in the power plant burning bituminous coal with high calorific value and low sulfur content, the content of floating beads in fly ash is generally more; on the contrary, the power plant burning anthracite or lignite will produce less floating beads in fly ash; in terms of combustion mode, suspended combustion boiler is conducive to floating For the formation of beads, floating beads are not easy to be produced in other types of combustion boilers, such as layer fired boilers and cyclone furnaces.
When the pulverized coal is burned in the boiler, it usually needs to go through several stages, such as decomposition, sintering, melting and cooling. In the decomposition stage, the volatilization with lower gasification temperature will first escape and burn to generate heat; under the action of combustion, the coal powder will form porous carbon particles (coke), and then after the carbon content is completely burned, it will further change into porous glass, and the shape will still remain the original irregular shape; with the increase of temperature (about 1400? C), further combustion will enter the melting stage After cooling, the dense glass beads with high density and small particle size will be formed, and some of them will form glass beads with thin-walled hollow structure, which is called floating beads.