Guide Chapter 15, Pneumatic Conveying

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Sections 1. Sections 2. Sections 3. Sections 4. Sections 5. Sections 6. Sections 7. Sections 8. Sections 9. Sections Pneumatic Conveying System Market Dynamics. About Us:. Advanced Search. Article Navigation. Close mobile search navigation Article navigation. Volume , Issue 1.

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Previous Article Next Article. Research Papers. This Site. Google Scholar. Yuji Tomita Yuji Tomita.

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Author and Article Information. Hui Li. Mar , 1 : 4 pages. Published Online: March 1, Article history Received:. Estimate pipe diameter with a little practice you get a feel for what works 4. Calculate saltation velocity 5. Size blower Blower, silencer, inlet filter 2. Acceleration 3. Horizontal pipe section 4.

Pipe bends 5. Vertical pipe section 1. Use of flexible hose at the pickup should be kept to minimum.

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Excessive length of flexible hose, often in the form of a coil, is the worst pickup pipe configuration. Inability to provide proper configuration at the pickup will result in plugging condition at gas velocities higher than saltation velocity. Avoid conveying line layout with bends or elbows placed back to back. This will inevitably causes excessive pressure drop and premature line plugging. Consider stepping conveying lines increasing the pipe diameter to prevent excessive velocity at the end of the line. Be sure to maintain the minimum required Froude number at the step location, otherwise the material will salt out of the suspension.

Properly stepped systems result in more efficient systems with lower degradation and wear. Using ISO pipes or tubes allows for more choices in diameters.

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Minimizing the number of bends or directional change results in higher capacity, lower degradation, less erosive wear and more reliable flow. Larger solids and gas frictional losses caused by higher gas velocities can absorb more energy than the extra input of energy. There is an optimum gas flow rate for a given lean phase flow system.

Install sufficient ports or couplings in the systems for pressure measurement during troubleshooting. Pressure measurement is a convenient method to measure the pulse of a conveying system. Take some time to generate the base line data for an existing conveying system.

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It comes in handy for future troubleshooting. Air leakage due to clearances and returning pockets can result in reduced flow or unsteady feed rate.

The leakage can be vented in a number of ways. The vent system should be designed much akin to a conveying system with sufficient gas flow and minimal bends. Product damage and wear at bends is very material dependent. Blind Tee's usually have much merit, but cause a greater pressure drop than long radius bends. Mitered elbows can be a good compromise in some cases. Minimum conveying velocity is a function of conveying rate. Make sure that the gas velocity at the pickup is greater than the saltation velocity at the highest solids flow rate. Safety margin must be allowed for non-optimal line configuration at the pickup short acceleration length, bends etc.