Abstract
The working characteristics of a laboratory ball drum mill during grinding of Karaganda coal products were studied in order to apply the results obtained to industrial installations. The performed analysis shows that the most complicated and energy-intensive stage of preparation of coal dust is the grinding of fuel. The operational characteristics of the mill productivity, consumed electric power and specific energy consumption in terms of the relative rotational speed of the drum as well as the optimal values of the relative velocity determining the qualitative grinding of the fuel have been determined. The performance of the processed drum mill reaches its maximum at a relative speed of rotation of the drum 0.71 ensuring a waterfall mode of grinding of fuel related to the high-speed mode of a coal-grinding mill. The estimated specific energy consumption for fuel grinding varies in the range from 0.11 kWh/kg up to 0.23 kWh/kg at fuel milling coefficient of Kl = 1.2.
Highlights
The most complicated and energy-intensive stage of preparation of coal dust is the grinding of fuel
The dust preparation system equipped with ball drum mills (BDM) is widely used in many thermal power plants (TPP) for grinding different types of solid fuel
The values for the specific energy consumption obtained are consistent with the current standards for BDM - 0.15 up to 0.25 kW/kg of coal with a fuel milling coefficient of Kl = 1.4
Summary
The most complicated and energy-intensive stage of preparation of coal dust is the grinding of fuel. Economical and safe operation of the dust preparation equipment, it is necessary to focus to the entire system for preparation and grinding of fuel at thermal power plants. The dust preparation system equipped with ball drum mills (BDM) is widely used in many thermal power plants (TPP) for grinding different types of solid fuel. The main disadvantage of the BDM is the significant electricity consumption, which at the TPP level is about a quarter of the total electricity consumption for own needs. The stated above shows that the solid fuel requires the most complicated and expensive preparation before combustion. The purpose of the study is to improve the efficiency of the BDM because of their widespread use in many industries
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