What Are Some Common Problems Associated With Dilute Phase Pneumatic Conveying?
Answers
Answer:
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Explanation:
Probably the most common problem encountered in dilute phase pneumatic conveying is the wearing of the rotary valve that serves as an air lock where the product is introduced into the system. If excess air is allowed to pass by the rotary valve, this can cause bridging of the material the flow can be slowed or stopped.
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(1) improved test-design procedures, reducing air flow and power consumption
(2) more efficient operation, reducing transport velocities, high rates of wear and product damage (3) developments in abrasion-/impact-resistant materials, extending the service life of pipes/bends. However, there are numerous (existing or potential) problems that are not so obvious to the designers, users, and even researchers of dilute-phase pneumatic conveying technology. Some of the major issues include: (i) higher rates of gas expansion in negative-pressure conveying (i.e. with respect to “equivalent” positive-pressure systems); (ii) rotary valve feeding characteristics (e.g. venting effects, interfacing with pipeline, deposition problems); (iii) predicting minimum conveying velocity for different products, conveying rates and pipe diameters (e.g. localized deposition, effect of feeding method and prime mover, subjectivity in identifying and defining saltation conditions); (iv) conveying through large-diameter pipelines (e.g. unexpected deposition problems, effect of feeding method).