Analyze the principle of Livestock Fence

The powder impregnation is generated from the fluidized bed process. In the Winkler gas generator, a fluidized bed was first used for petroleum contact decomposition, and then a solid-gas two-phase contact process was developed, and then gradually applied to metal coatings. Therefore, sometimes it is still called the “fluidized bed coating method”. The actual process is to add the powder coating to the bottom of the porous water-permeable container (flow trough), enter the compressed air from the blower, and then process it to turn the powder coating to the “fluidization” status”. Become a fine powder evenly distributed.

The fluidized bed is the second stage of solids flow (the first is the fixed bed stage, and the second is the gas flow delivery stage). On the basis of the fixed bed, continue to increase the flow rate (W), the bed starts to expand and loosen, and the bed height starts to increase. , Each powder particle. E floats, thereby leaving the original position to have a certain degree of movement. Then enter the fluidized bed stage.

Section BC shows that the powder layer in the fluidized bed expands, and its height (I) increases with the increase of gas velocity, but the pressure in the bed does not increase (ΔP). The fluidized bed will not change the flow rate within a certain range, and will not affect the specific power required by the fluid. This is the characteristic of fluidized bed, which is used for coating process. The uniformity of the fluidization state in the fluidized bed is the key to the uniformity of the coating. The fluidized bed used for powder coating belongs to “vertical fluidization”. The fluidization number is found through experiments. Generally, it can be coated. The suspension rate of powder in the fluidized bed can reach 30%-50%.