【Weekly Topic】Slurry particle size control, focusing on 200 mesh and 325 mesh
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Regarding the control of water-coal slurry particle size: while maintaining the concentration, fluidity, and 24-hour stability of the water-coal slurry, it is appropriate to increase the amount of 75-grade steel rods used, thereby making the particle size of the slurry lean towards 200 mesh and 325 mesh; in other words, the particle size of the slurry is finer, with no particles of 40 mesh appearing in the analysis. This makes it easier to atomize the coal slurry; the particles become smaller, allowing for better contact with oxygen, which facilitates the gasification reaction and reduces wear on the medium-nozzle. I hope everyone will share more opinions. Thank you.
Is the particle size inclined towards 200 mesh and 325 mesh? Using mesh to express particle size is not very intuitive. It is best to use diameter to represent it
200 mesh – 74 microns, 325 mesh – 44 microns. For pulverized coal gasification, a value of less than 90 microns is required. I believe that as long as the properties of the water-coal slurry remain stable, its fluidity will also meet the requirements, so it is not necessary to use a 40-mesh sieve.
Slurry coal should have specific requirements regarding its particle size distribution. According to the mesh size: 8 mesh – 100%; 14 mesh – 98%–100%; 40 mesh – 90%–95%; 200 mesh – 60%–70%; 325 mesh – 25%–35%. The requirements set by different manufacturers may vary slightly.
Why is such a particle size distribution suitable for gasification?
It has a reasonable range, and it needs to be considered comprehensively; it would be best if there were industrial evidence for this, as theoretical arguments alone are not sufficient.