Bettersize instruments provide the particle size analysis data of coal industry products (coal, coal water slurry and coal ash).
Thermal power plants generally smash raw coal into coal fines. The good combustion characteristics of coal fines can reduce incomplete combustion losses. In general coal crushing, the range of particle size distribution is mostly within 5-180 μm, and the particle size of coal fines should be controlled within 20-50 μm. The ideal particle size testing dispersion method for coal fines is dry dispersion (i.e., dispersing coal fines with compressed air). The gas pressure for dispersing coal fines should approach the actual pressure of the boiler to transport the coal fines. The Optimum operation of pulverised coal power stations is difficult to maintain especially when the coal can be sourced from different locations where its grind ability differs because of a high degree of variability in fuel properties and loading profiles. Because of this operators may apply boiler settings that are too conservative and thus the tuning can be far from ideal.
Imbalances in coal flow rates to each burner can negatively affect performance, safety, amount of NOx emissions, slagging formation and power consumption. Excessively coarse throughputs generate higher levels of unburned carbon in the ash making the byproducts less saleable. In addition a feed, which has been over milled, produces areas of high temperature (Hot spots) that lead to higher levels of NOx emissions and flame instability in addition to expensive overgrinding.
A kind of clean coal-based fluid fuel, coal water slurry not only has similar physical properties to heavy oil, it also has better combustion characteristics than coal. It is one of the most important ways of using coal cleanly and efficiently. The particle size optimization of coal water slurry in power plants can save potentially considerable funds by promoting production efficiency.