The Influence of Hydrocyclone Structure on Classification Effect

Date: 2021-11-03     From: Longding     Author: admin

As common classification equipment, hydrocyclones are composed of overflow pipes, cylinders, cones, and sand spouts. What kind of effect does the structural change of the hydrocyclone have on the classification efficiency?

Structural parameters that affect the classification effect

Suppose that the diameter of the cyclone is D, the diameter of the feeding port is df, the diameter of the overflow pipe is dov, the diameter of the sand settling port is ds, the insertion depth of the overflow pipe is hov, the height of the cylinder is H, and the cone angle is α. The formula for the volumetric capacity Q of the cyclone is Q=K·D·dov·√P, m3/h. Among them, K is the coefficient, which increases with the increase of the value of df/D, and the units of D, dov and df are all m, and P is the feed pressure in kPa.

It can be obtained from the above formula that under the condition that other parameters remain unchanged, the processing capacity is proportional to the diameter of the cyclone, and the diameter of the overflow tube is also proportional to the diameter of the cyclone, so Q is proportional to D2. In other words, the diameter of the cyclone is increased by 2 times, and the processing capacity will be increased by 4 times.

At the same time, the adjustable parameters also include the diameter of the overflow pipe, the insertion depth of the overflow pipe, and the diameter of the sand settling port.

The diameter of the overflow pipe has a greater impact on the entire cyclone. The larger the diameter of the overflow pipe, the pressure will decrease accordingly, the overflow fineness will become coarser, and the classification efficiency will first stabilize and then decrease. Therefore, the classification efficiency should be maintained within a stable interval. The diameter of the sand settling port has a relatively small effect on the entire cyclone. However, the larger the sedimentation opening, the greater the amount of sedimentation and the increase in the content of fine particles. Therefore, if the overflow opening and the sedimentation opening are adjusted at the same time, the relative yield of the overflow and sedimentation can be changed.

The diameter of the overflow pipe of the hydrocyclone has a greater influence on the pyramid ratio of the hydrocyclone. Pyramid ratio refers to the ratio of the diameter of the overflow pipe to the diameter of the sedimentation port, and is an important parameter that affects the volumetric yield of overflow and sedimentation and the grading particle size. In general, a smaller pyramid ratio can be used for the classification of fine-grained materials, and a larger pyramid ratio can be used for the classification of coarse-grained materials. The pyramid ratio of the cyclone used in actual production is generally 3~4.

In addition, the insertion depth of the overflow pipe will also affect the diversion effect. It is because the change of the insertion depth will affect both the pressure drop and the separation effect. The deeper the insertion, the pressure drop first increases and then decreases. However, if the insertion is too deep, large particles cannot be separated smoothly.

In practical applications, in addition to the above several parameters that need to be considered, the feed pressure, lining material, etc. also need to be considered. Choose the appropriate cyclone size and model according to different processing volumes and slurry concentrations to achieve the best processing effect.