cyclone separator

The cyclone dust collector has a simple structure, is easy to manufacture, install, and maintain, and has low equipment investment and operating costs. It has been widely used to separate solid and liquid particles from airflow, or to separate solid particles from liquids. Under normal operating conditions, the centrifugal force acting on particles is 5-2500 times that of gravity, so the efficiency of cyclone dust collectors is significantly higher than that of gravity settling chambers. A cyclone dust removal device with a dust removal efficiency of over 90% has been successfully developed based on this principle. Among mechanical dust collectors, cyclone dust collectors are the most efficient. It is suitable for the removal of non viscous and non fibrous dust, mostly used to remove particles larger than 5 μ m. The parallel multi tube cyclone dust collector device also has a dust removal efficiency of 80-85% for particles larger than 3 μ m.

advantage

According to the method of integrating the axial velocity with the flow area mentioned earlier, calculate the changes in the descending flow rate of a conventional cyclone dust collector after installing different types of drag reducing rods, and plot the percentage of the total processing flow rate of the descending flow dust collector at different cross-sections under various conditions to indicate the average value of the flow rate in the upstream and downstream flow zones, that is, the difference between the descending flow rate and the actual flow rate in the downstream flow zones. It can be seen that the short-circuit flow and descending flow of each model vary along the height of the dust collector. Compared with conventional cyclone dust collectors, installing full-length drag reduction rods 1 # and 4 # increases the short-circuit flow rate, but installing non full-length drag reduction rods H1 and H2 reduces the short-circuit flow rate. The variation law of the flow rate along the process after installing 1 # and 4 # is basically the same as that of a conventional cyclone dust collector, showing a linear distribution, with three parallel decreasing lines. But after installing H1 and H2, the distribution shows a broken line instead of a straight line, and the inflection point is precisely the cross-sectional position where the drag reducing rod is inserted from bottom to top. From this, it can also be seen that the non full length drag reduction rod increases the downward flow rate of each section above the cross-section, which is greater than that of a conventional dust collector. However, after contacting the drag reduction rod, the downward flow rate decreases rapidly, reaching or below the value of a conventional dust collector at the bottom of the cone.

The reduction of short-circuit flow can improve efficiency, increase the descending flow rate of the cross-section, and also increase the residence time of dusty air in the dust collector, creating more opportunities for dust separation. Therefore, although the drag reduction effect of non full length drag reduction rods is not as good as that of full length drag reduction rods, it is beneficial to improve the dust removal efficiency of cyclone dust collectors. There is a short-circuit flow rate of up to 24% near the inlet section of the exhaust core pipe of a conventional cyclone dust collector, which will seriously affect the overall dust removal effect. How to reduce this short-circuit flow will be one direction to improve efficiency. Although the drag reduction effect of non full length drag reduction rods is not as good as that of full length drag reduction rods, it has practical significance because it reduces the short-circuit flow rate of conventional cyclone dust collectors and increases the flow rate of cross-sectional descent, thereby improving the dust removal efficiency of cyclone dust collectors.