Study on the Influence of Pulping Process on Rheological Properties of Coal Water Slurry

Abstract

The fluidity of the coal water slurry during transportation, the stability during storage, and the combustion characteristics during atomization combustion have a great relationship with the rheological properties of the coal water slurry. In this chapter, the zwitterionic humic acid graft copolymer coal water slurry dispersing agent HSC and anionic humic acid graft copolymer dispersing agent HS were used to prepare Binchang coal water slurry. Dispersing agent, pulping concentration and temperature were discussed. The effect on the rheological properties of coal water slurry. The result shows that the coal water slurry made by HSC and HS with graft structure has obvious yielding pseudoplastic fluid characteristics, while the NSF and HA coal water slurry show slight yielding pseudoplastic fluid characteristics. With the increase of pulping concentration, water coal the apparent viscosity, yield stress and flow coefficient of the pulp show an increasing trend. The greater the pulping concentration, the flow characteristics of the coal water slurry will develop to the yielding plastic fluid; for the pulp made by HSC, when the pulping concentration At 67 wt%, the slurry exhibited a slight yielding plastic fluid characteristic. For the HS slurry, when the pulping concentration was 68 wt%, the slurry exhibited a slight expansion plasticity characteristic. At 25 ° C, the fluid model of the coal water slurry yields a pseudoplastic fluid, after which the elevated temperature can weaken the yield pseudoplastic properties of the slurry and cause the slurry to transform into a plastic fluid.