Preparation method of high-temperature oil-coal slurry

Abstract

The invention relates to a preparation method of high-temperature oil-coal slurry, which comprises the following steps of: (1) conveying pulverized coal from a pulverized coal storage tank into a horizontal solid-liquid mixer through a pulverized coal feeding hole to mix with solvent oil which is sprayed in from a high-temperature solvent tank through a liquid feeding hole, discharging the pulverized coal through a discharging hole of the horizontal solid-liquid mixer and conveying to a coal slurry stirring kettle; (2) further homogenizing the oil-coal slurry in the coal slurry stirring kettle under the action of a stirring paddle; and (3) extracting the oil-coal slurry from the coal slurry stirring kettle through a coal slurry discharging pipeline, wherein one part of the oil-coal slurry is returned to the coal slurry stirring kettle by the coal slurry discharging pipeline, and the rest is conveyed to a downstream liquefaction reaction system by a reaction material conveying pipeline. The method can solve the problem that coal particles of small granularity are hardly and fully dispersed in the solvent oil to form even high-temperature oil-coal slurry, and can be used for rapidly preparing qualified coal slurry and continuously producing coal slurry by a coil liquefaction reaction.

Description

technical field [0001] The invention relates to a preparation method of oil-coal slurry, more specifically, a preparation method of high-temperature oil-coal slurry. Background technique [0002] The commonly used solid-liquid two-phase mixing method is generally to add the two materials into the mixer separately, and then mix them by mechanical stirring or bubbling stirring. For powders with fine particle size, especially powders with a particle size of less than 100 mesh, it is easy to "wrap" when mixed with liquid, that is, when fine powder is mixed with liquid, the liquid only dissolves the surface of the powder block and cannot penetrate into the powder. The inside of the body, thereby producing secondary aggregated particles of the powder, and it is very difficult to redisperse the generated secondary aggregated particles into the liquid. In actual operation, the above-mentioned "secondary agglomeration" phenomenon often occurs when coal powder with a particle size of...

AI Technical Summary

Problems solved by technology

This method can solve the problem that small-sized coal particles are difficult to completely disperse in solvent oil and form a uniform high-temperature oil-coal slurry, can quickly prepare qualified coal slurry, and can realize the continuous production of coal slurry required for coal liquefaction reaction

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