Hydrocyclone structure parameters
Writer： admin Time：2020-11-05 10:11 Browse：℃
The influence of the cross section size of the feed pipe on the separation particle size of the cyclone
It is generally believed that increasing the cross-sectional size of the feed pipe can effectively reduce the total pressure loss of the cyclone, and at the same time can increase the production capacity of the cyclone and increase the separation particle size within a smaller range.
The influence of the diameter of the overflow pipe on the separation particle size of the cyclone
The diameter of the overflow pipe is an important parameter that affects the overall separation performance of the cyclone. Reducing the diameter of the overflow pipe within the permitted range will result in a decrease in separation accuracy and a reduction in separation particle size. When the overflow pipe diameter is smaller than the flow field in the cyclone When the radius of the maximum tangential velocity is located, the separation particle size will increase instead. For the insertion depth of the overflow pipe, the lower end surface should be higher than the cylindrical cone interface, otherwise it will aggravate the turbulence of the flow field; it should not be higher than the lower edge of the feed pipe to avoid losing its due role. As the insertion depth of the overflow pipe decreases, the separation efficiency of fine particles decreases, while the efficiency of coarse particles increases due to the influence of short-circuit flow.
The influence of the diameter of the underflow pipe on the separation particle size of the cyclone
The diameter of the underflow pipe has a significant effect on the separation particle size and classification efficiency of the cyclone. Generally speaking, increasing the diameter of the underflow pipe is beneficial to the separation and classification of fine particles, but too large a diameter leads to a decrease in underflow concentration, an increase in the content of fine particles, and a decrease in classification efficiency. When it approaches or exceeds the diameter of the overflow pipe, the rotation The working process of the flow device will be damaged. The ratio of the diameter of the underflow pipe to the diameter of the overflow pipe (also known as the discharge ratio) should generally be in the range of 0.15 to 1.
Influence of column diameter on separation particle size of cyclone
The diameter of the column section of the cyclone mainly affects the production capacity of the cyclone and the particle size of the solid phase separation. It is generally believed that as the diameter of the cyclone increases, its production capacity and separation particle size will increase, and the possibility of clogging will decrease, making the operation and use more reliable. Small diameter hydrocyclones (groups) should be used to separate solid particles with very fine particle size, and larger diameters should be preferred when the same separation requirements are met. Since there is also an effective separation process in the column section of the cyclone, and the longer the column section, the more perfect the solid phase particle sedimentation separation process, so for the separation of small solid particles, it is generally considered that a larger column section length can be used. The cone angle is one of the main structural parameters of the cyclone, which has a significant influence on the classification performance.
The effect of cone angle on the separation particle size of cyclone
The cone angle of the hydrocyclone is generally 10-20o, and the larger the diameter of the column section, the larger the cone angle is usually. The cone angle of a cyclone with a diameter of more than 75mm is generally selected as 20o, and for a micro cyclone, the cone angle can even be selected as 15o. As the cone angle increases, the separation particle size of the cyclone becomes larger, and the separation accuracy is improved, but the classification efficiency shows a downward trend.
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Optimizing the structure of the cyclone is one of them. For the hydrocyclone, its cylindrical cone structure determines the boundary structure of the main flow field and affects the separation accuracy and classification efficiency of the cyclone. For the cyclones of the same specification, the cone with a large cone angle has a short cone and the separation time of the material in it is also short; a small cone angle has a long cone and the separation time of the material in it is also long. Therefore, the size of the packing cone angle determines the length of the separation time, which not only affects its production capacity and separation efficiency, but also affects its separation particle size. Limestone grading cyclone station. The separation particle size of the cyclone is related to the cone angle. The smaller the cone angle, the smaller the separation particle size of the cyclone is. On the contrary, the larger the separation particle size.
The conventional hydrocyclone is a cylindrical cone structure, the cone angle of the general cone?
Coal preparation plant hydrocyclone is a widely used solid-liquid mixture separation equipment, which can complete the classification and separation of solid particles, liquid clarification, slurry concentration and other operations. The hydrocyclone has many advantages. It has simple structure, no moving parts, small floor space, low equipment cost, high efficiency, large processing capacity, large operating flexibility, low operating and maintenance costs, low power consumption, flexible process layout, It is suitable for the production of various materials and has been widely used in coal preparation plants and has achieved huge economic and social benefits.
Working principle of hydrocyclone in coal preparation plant
The hydrocyclone in the coal preparation plant is prominent in classification and concentration. The structure of the hydrocyclone is shown in Figure 1. Under a certain pressure, the slime water is fed into the cyclone through the tangential inlet to form a revolving flow. At the center of the cyclone, the particle rotation speed reaches the maximum, which generates the maximum centrifugal force. The slime water expanding and moving around forms a low pressure zone near the central axis. Air is sucked in from the underflow port, and a low-pressure air column is formed at the central axis.
The process parameters of the hydrocyclone are important factors that affect its classification and concentration effect. It includes the pressure of the personnel, the concentration of the personnel, the size of the personnel and the particle size composition.
The length of the cylinder of the hydrocyclone mainly affects its separation particle size and separation efficiency. Increasing the length of the cylinder can prolong the separation time, reduce the separation particle size and increase the separation effect, but will reduce the output and increase the energy consumption; when the length of the cylinder is reduced, the result is the opposite. Normally, the structural parameters of the cyclone have been standardized, which are mainly reflected in the technical performance table of the product. It only needs to calculate the required diameter and number of cyclones according to the original design data (design capacity, material properties, operation type, separation particle size, etc.), and you can select other matching products from the technical performance table of its series Structural parameters.
When the processing capacity of the ball mill exceeds 165t/h, the cycle load is too large (up to 620%), the grit nozzle frequently blocks the three-product heavy medium cyclone, the overflow runs thick, and the grit is fine. Separation of granularity seriously restricts the normal use of system productivity. According to the existing problems on site, the concentrator and Hongxing Machinery reached a cooperation goal. The improvement goal was determined as: reducing the grinding cycle load, solving the problem of frequent clogging of the grit nozzle of the cyclone, ensuring a stable and smooth production process; improving the classification of the cyclone Efficiency, reduce the phenomenon of overflow running thick and sand trapping, improve the processing capacity of the ball mill under the premise of ensuring the overflow fineness.
