Effect of coal slurry particle size distribution on gasification
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Effect of coal slurry particle size distribution on gasification
The particle size distribution determines the slurry concentration; the larger the particle size, the lower the slurry concentration, which can lead to the formation of peroxides, increase oxygen consumption, and reduce gasification efficiency. Conversely, higher gasification efficiency is achieved, but it has an impact on transportation
One must never underestimate the impact of coal slurry particle size on burners. If the particle size is too large, the viscosity is low, but deposition occurs easily, leading to irregular blockages in the burner channels, uneven fuel injection from the burner, and fluctuations in the coal slurry pressure difference. The particle size is too fine and the viscosity is high, which affects flow.
The particle size distribution aims to increase the slurry concentration as much as possible while maintaining the viscosity, stability, and fluidity of the coal slurry. As for the impact on gasification, certainly the smaller the particle size, the better; this allows for rapid and complete combustion, improves the utilization rate of carbon, and reduces consumption.
The particle size is small, making it difficult to produce high-concentration water-coal slurry, and a large amount of additives are required； It has a large particle size, settles easily, and may burn incompletely upon entering the gasification furnace due to its relatively small specific surface area