Wear problems in pneumatic conveying pipelines
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This unit uses pneumatic conveying to transport silicon powder. Wear-resistant, thickened elbows are used at the bends; however, their service life is only about 2 weeks before they get worn out. Bypass connections to the tank body also lead to rapid wear, and even after welding repairs, the service life remains short. I hope everyone can share their ideas on possible solutions.
Is it positive pressure or negative pressure transportation? What is the diameter of the elbow? Reduce the flow rate, increase the bending radius, and reduce impact. It seems there’s no cheaper way in terms of materials
Increase the bending radius by using elbows with a larger radius, and line the inside of the pipe with ceramic
Which company developed the system? To actively reduce wear, the most successful approach at present is to lower the conveying speed. . Keep the speed within 5 M/s. . Passive measures involve defense strategies such as using more durable linings, etc., but the costs are also high. From what you’ve described, the ends of the conveyor pipes in the receiving area are worn out; it seems that increasing the bending radius won’t be very effective. For modification, spherical elbows could be used for shortening at the end, or the diameter of the reducing cone could be increased for shortening; however, the results are likely to be unsatisfactory. I have a follow-up question: with such a fast speed of transfer, is there severe degradation of the material? Will it have an impact on the subsequent gasifier reaction?
It’s 1.5D. Positive pressure transport can handle about 2 kilograms. Reducing the flow rate also does not alleviate wear.
Transporting silicon powder has no impact on subsequent processes. I think reducing the flow rate doesn’t work well either; wear still occurs. It mainly relies on solving the issues related to the material and the elbow pipes
Perhaps I haven’t mentioned such concepts to you, and I’m not aware of which company developed your system. Reducing the speed is the best solution; otherwise, how can those **component powders be transported? There is a theoretical curve: if the speed is reduced by half, i.e., to 1/2 of its original value, the wear will decrease to one cubic of the original wear level, resulting in only 1/8 of the original wear. .
If possible, use 45-degree elbows; when connecting branch pipes to the main pipe, insert them at a 45-degree angle into the main pipe.
Reduce flow velocity, increase radius, reduce impact
This post was last edited by Desert Fish on 2015-7-19 21:52. Silica powder has a high hardness and fast flow rate; our company uses it in the polysilicon and silicone industries, and a Q235 carbon steel lining with tungsten carbide yields good results. The coating thickness is 1-1.5 mm, and the service life is around 8-10 months. If you want to learn more or give it a try, you can contact me.