Flow properties in liquefier and preheater of direct coal liquefaction process.
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概要
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This is a quantitative review of gas-liquid-solid flow in direct coal liquefaction processes. The gas holdup in liquefiers is much larger than that in bubble columns for usual air-water systems, while the axial liquid mixing is much smaller in reverse. This indicates that the homogeneous bubble flow prevails in the reactors. By introducing a small amount of coalesced bubbles, the axial liquid mixing is increased to the level of the fully heterogeneous flow regime. Gas holdup, axial liquid mixing and mean settling velocity of solid particles in liquefiers are correlated by experimental equations and figures as functions of reactor diameter and operational conditions.<BR>The accumulation of ash particles growing in liquefier is simulated with a population balance equatign based on the sedimentation-dispersion model. The parameters used in the model can be obtained from the experimental results in cold model reactors except for the particle growth rate, which is dependent on coal species and reaction conditions and must be determined in each case.<BR>The radial and axial mixing of liquid in horizontal preheaters is affected by liquid or slurry viscosity. If the viscosity is substantially increased in the preheater, the intermixing between the liquid plug and bottom flow becomes insufficient. The heat transfer coefficient between the wall and the three-phase flow is well correlated by an experimental equation including the data at the Wilsonville pilot plant.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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