Utilization of Unburned Carbon as a Low Sulfur Alternative to Petroleum Coke

摘要

The unburned carbon has been treated at temperatures well above 1200-1300℃ in the combustor, and therefore its elemental analysis shows a very high carbon content (97.7%), and conversely, low hydrogen content (0.02%). These values are comparable with those reported for conventional calcined petroleum coke. Furthermore, the sulfur content of the unburned carbon is significantly lower than that of petroleum coke, 0.94% vs. 3.42%. In contrast, the density of unburned carbon is somewhat lower than for petroleum coke, probably due to its surface area, that is created by the rapid heat treatment experienced in the combustor by the unburned carbon. Furthermore, both the unburned carbon and the petroleum coke present isotropic and anisotropic textures, where a given ratio of anisotropic over isotropic coke is required for different applications. The baking yields are very similar for all the carbon bodies investigated around 90%, as expected from the similar thermal history and elemental composition of petroleum coke and coal coke. The densities of the green and baked carbon bodies produced with only petroleum coke are slightly higher than those of the carbon bodies prepared using coal coke, probably due to the non-optimized formulation.