Dry coal powder gasification: coal powder conveying density and velocity
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Some sources state that the solid-gas ratio for coal powder transportation is 200–580 Kg/kg. In our actual operations, the density of the coal powder is around 300 Kg/m3, and its velocity is generally 6–10 m/s. Is it possible for the solid-gas ratio to be that high under such conditions? Please discuss this: taking into account factors such as the amount of gas required for transportation, the stability of coal powder flow, pipeline wear, and the density and velocity control requirements when using CO2 or N2 for coal powder transportation, what values are appropriate, and what should be the corresponding solid-to-gas ratio?
This solid-to-gas ratio is considered moderate to slightly low; it varies depending on the type of coal, as does the solid-to-gas ratio in dense-phase transport. Such specific values need to be determined through experiments on dense-phase transport using different coal types. 300 kg/m3 may be just right for the type of coal you use. It is designed based on a value of around 400.