How is fly ash produced

During boiler operation, pulverized coal and high-speed air flow are mixed together and injected into the combustion zone of the furnace, so that the organic matter in pulverized coal particles can be fully burned, but the complete degree of combustion depends on the boiler efficiency and operation level. The higher furnace temperature of pulverized coal fired boilers in modern power plants with good operation can reach or exceed 1600 ℃. At such a temperature, it is sufficient to melt all minerals except a small amount of quartz (fine-grained crystallization) in the ash. However, the actual combustion temperature of most power plant boilers is much lower than the above temperature. At a lower temperature, only a small part of inorganic substances can be melted. Moreover, the furnace temperature is not very uniform, that is to say, even in the same boiler, the firing conditions of fly ash are not exactly the same, let alone different boilers.

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