Gas-liquid-solid three-phase fluidized bed sorting machine and sorting method thereof

Abstract

The invention provides a gas-liquid-solid three-phase fluidized bed sorting machine and a sorting method thereof. The sorting machine comprises a sorting barrel, a center feeding barrel, a conical distribution plate, a fine coal overflow collecting tank, a bubble generator, a fluid distribution master and branch pipe, a buffering and discharging fluid distribution plate, a bed online densimeter, a programmable density controller, an underflow discharging automatic control actuator and an underflow discharging valve. The sorting method includes the steps that water flow passes through the bubble generator and the fluid distribution master and branch pipe and enters the sorting barrel and a uniform and stable ascending gas-liquid two-phase fluid is formed in the sorting barrel under the action of the buffering and discharging fluid distribution plate, and materials entering the sorting barrel are separated according to differences of density and surface properties, so that sorting precision of the materials according to density differences is improved, and the loss that low-density rough particles enter underflow and the defect that high-density fine silt pollutes fine coal are effectively avoided. The gas-liquid-solid three-phase fluidized bed sorting machine is simple in structure and method, low in sorting lower limit, wide in processing particle range, high in sorting precision, high in reliability and wide in applicability.

Description

technical field [0001] The invention relates to a gas-liquid-solid three-phase fluidized bed sorter and a sorting method thereof, and is especially suitable for desulfurization and ash reduction of coarse coal slime in a wet coal preparation process. Background technique [0002] Since the particle size of coarse coal slime (according to the national standard GB / T7186-2008, generally refers to 2mm ~ 0.25mm coal particles) is close to the effective separation particle size limit (generally 0.5mm) of gravity separation and flotation, gravity separation and flotation The sorting effect is poor. At present, this part of coal slime is generally separated by small-diameter dense medium cyclones, spiral separators and liquid-solid fluidized bed separators. Both the small-diameter dense medium cyclone and the spiral separator have obvious deficiencies in the separation of coarse coal slime, while the liquid-solid fluidized bed separator has low separation density and is controllabl...

AI Technical Summary

Problems solved by technology

However, in the actual separation process, due to the low classification efficiency of the classification equipment, the actual separation particle size range often exceeds the particle size requirements of the liquid-solid fluidized bed separator, and the particle size has a significant impact on the separation effect

It is mainly reflected in the fact that high-density fine particles enter the overflow to pollute clean coal, and low-density coarse particles enter the underflow to become tailing coal, resulting in high ash content in clean coal, low recovery rate of clean coal, low separation accuracy, and poor separation effect

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