Air heavy medium fluidized bed dry coal preparation
Basic principle and characteristics of dry coal preparation by air heavy medium fluidized bed
(1) The process of fluidization
Air heavy medium fluidization is a method in which a particulate solid medium is brought into a fluid-like state by contact with a gas, as shown in FIG. 1(a), a container 1 having a vertical wall, and a distributor 2 at the lower portion. A plurality of uniform fine particles are stacked thereon. A U-shaped pressure measuring tube hole is placed in the lower portion of the granular layer, and a gas flow from the bottom 4 through the distributor 2 is carried out, and then discharged from the top of the container 1. As the gas stream passes through the bed, as the gas flow rate increases, the entire fluidization process has three basic stages: 1 fixed bed; 2 fluidized bed; 3 transport bed. See Figures 1(b) (c) and (d), respectively.
Figure 1 Ideal fluidization process
(2) Fluid-like properties of a fluidized bed
Whether the gas-solid fluidized bed can have liquid mobility is very important for the air heavy medium fluidized bed sorting technology. Studies have shown that the gas-solid fluidized bed after complete fluidization looks like a boiling liquid and exhibits fluid-like properties in many respects. as shown in picture 2.
The two connected beds can be automatically adjusted to the same horizontal plane [Fig. 2];
Figure 2 Fluid-like properties of gas-solid liquefied beds
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