A sorting method of variable-diameter pulsating liquid-solid fluidized bed

Abstract

The invention discloses a variable-diameter pulsating liquid-solid fluidized bed separation method. The method includes the steps that a, water in a water tank is pumped into a steady stream flow measurement and control system and a pulsating stream flow measurement and control system through a water pump; b, one water stream is regulated through a second flow control valve and a glass rotameter of the steady stream flow measurement and control system to form a steady stream, the other water stream is regulated through a first flow control valve, a stream pulsation controller and a flowmeter of the pulsating stream flow measurement and control system to form a pulsating stream with a pulsation cycle, and the steady stream and the pulsating stream are gathered and then enter a variable-diameter column; c, the pulsating mixed stream forms a pulsating ascending stream in the variable-diameter column through a turbulence plate, coarse coal slime enters the variable-diameter column from a feeding hopper, descending coarse coal slime particles and the pulsating ascending stream move in opposite directions, a steady bed is formed, clean coal ascends to an overflow weir to be discharged, and tailings settle down to be discharged through a bottom stream tube. The method has the advantages that the separation effect on the coarse coal slime difficult to separate is good, and the clean coal yield is increased without increasing the clean coal ash content.

Description

technical field [0001] The invention relates to a sorting method, in particular to a sorting method of variable-diameter pulsating liquid-solid fluidized bed. Background technique [0002] At present, the coarse slime separation equipment widely used in industrialization at home and abroad mainly includes: aqueous medium cyclone, coal slime dense medium cyclone, spiral separator, liquid-solid fluidized bed separator, etc. The separation principle of the spiral separator is that the difference in the force of the particles of different densities on the surface of the spiral groove results in the difference in their movement sub-velocities, which is finally reflected in the different distribution along the radial direction of the spiral groove surface, so that the particles of different densities are completed. sorting. It has a good separation effect for easy-to-separate coal, but the height of the fuselage is large, the process parameters are not easy to adjust when the coa...

AI Technical Summary

Problems solved by technology

However, with the deteriorating coal quality of the selected raw coal in the coal preparation plant and the stricter requirements of the users on the separation effect, the traditional two-product liquid-solid fluidized bed coarse slime separator has gradually exposed some problems in practical application: ( 1) Clean coal products polluted by high ash fine mud

(2) The separation effect of refractory coarse coal slime with high intermediate density content is poor

Coarse coal slime in most coal preparation plants is difficult or extremely difficult to separate. The ash content of the overflow coarse and clean coal in the liquid-solid fluidized bed is relatively high, while the underflow ash content is relatively low, and the separation progress is poor.

(3) The range of effective sorting granularity is too narrow to expand

[0004] At present, most of the refractory coarse coal slime in China is still separated by liquid-solid fluidized bed, but the practice shows that the traditional liquid-solid fluidized bed is not effective in treating refractory coarse coal slime. , the yield of clean coal is extremely low, increasing the yield of clean coal, the ash content of clean coal exceeds the standard seriously, which seriously affects the production and economic benefits of the enterprise

[0005] The equipment and methods for high-grade separation of refractory coarse coal slime have seriously restricted the development of coal preparation technology, and have gradually become a bottleneck problem for coal preparation plants to ensure product quality and improve economic benefits

Images