Coarse and fine particle separation device for long-distance pipeline transportation of coal slurry

Abstract

The invention discloses a coarse and fine particle separation device for long-distance pipeline transportation coal slurry. The coarse and fine particle separation device comprises a slurry inlet pipe, a concentration tank top overflow groove, an overflow pipe, a valve, a power distribution device, a water inlet pipe, a concentration sensing device and a concentration tank. The valve is installed on the water inlet pipe. The overflow pipe is connected with the concentration tank top overflow groove. The concentration sensing device is installed in the concentration tank and sends a detected signal to the power distribution device. The power distribution device controls the adjusting valve to open or close to control the water inflow amount. Due to the fact that the coal slurry is diluted to be the low-concentration coal slurry by adding water through the coarse and fine particle separation device before a dewatering step, so that the mutual interference degree in the sedimentation process of coarse and fine particles in the coal slurry is lowered, and separation of the coarse and fine particles in the coal slurry is accelerated, and accordingly the problem that the dewatering effect is influenced by the fine particles with the high water absorption property is completely solved.

Description

technical field [0001] The invention belongs to the field of long-distance pipeline coal transportation, and in particular relates to a long-distance pipeline transportation coal slurry coarse and fine particle separation device. Background technique [0002] The coal slurry transported by long-distance pipelines is generally a medium-concentration coal slurry with a weight concentration of 45% to 55%, with an average particle size of 0.3 to 0.4 mm, of which fine particles smaller than 0.045 mm account for 20% to 22%. After the coal slurry reaches the end of the pipeline, it needs to be dehydrated into coal slime. Before the present invention, it was generally used to directly send the coal slurry into a centrifugal dehydrator for centrifugal dehydration, and then concentrate it in a thickening tank and then send it to a filter press for dehydration. Because the coarse and fine particles in the coal slurry are mixed together, during the dehydration process of the centrifuge,...

AI Technical Summary

Problems solved by technology

Because the coarse and fine particles in the coal slurry are mixed together, during the dehydration process of the centrifuge, the fine particles with strong water absorption are attached to the coarse particles, resulting in high moisture in the final coal slurry product, which greatly reduces the dehydration effect

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