By G.E. Klinzing, F. Rizk, R. Marcus, L.S. Leung
Pneumatic conveying is without doubt one of the preferred equipment of dealing with bulk powdered and granular fabrics in mining, chemical and agricultural industries. This third version of this profitable ebook covers either theoretical and sensible points of the topic. it truly is distinct in its mixing of educational fabrics and stable commercial layout ideas. every one subject is roofed intensive, with emphasis put on the newest options, structures and layout and study method. Its accomplished labored examples and desk make sure that the reader don't need to seek advice the other reference fabric. during this 3rd edition new sections on simulation and modelling were additional, whereas using tomography as a device for tracking pneumatic conveying can also be covered.
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Additional resources for Pneumatic Conveying of Solids: A theoretical and practical approach
Fluidisation and Fluid Particle Sy stems, Reinhold, New York. 6. Engineer Equipment Users Association (1963) Pneumatic Handling of Powdered Materials, Constable , London. 7. Kongskilde Maskinfarbrik Als, Denmark. 8. A. (1983) Pneumatic Conveying, John Wiley, New York, pp. 53-62. 9. Pfeffer, R. S. (1974) A review of drag reduction in dilute gas-solids suspension flow in tubes, Paper Fl , Proc. Int . Conf. on Drag. Reduction, BHRA Fluid Engineering, Cranfield, UK. 10. D. (1978) An investigation into the influence of pressure pulsations on the flow characteristics of solids gaseous suspensions.
7 Wear in pneumatic conveying systems Depending upon the nature of the solids and the conveying velocity, a certain amount of wear can take place during the gas-solids transportation process. In particular, the first area which normally wears out is that of a bend. High impact forces at the so-called primary wear point result in the bend wearing out. The whole issue of adequate bend design to ensure minimal downtime as a result of erosion is described elsewhere in this monograph. 8 Gas-solids separation The transportation process is terminated at the gas-solids separation zone.
There are two stages of air drying in a compressed air system: 1. after-cooling; 2. drying. After-cooling the air results in the air temperature being dropped below the dew point (the saturation vapour temperature at which any further decrease in temperature will cause condensation) and collecting the condensate in a trap. After-coolers can be categorized into two main types: 1. direct contact 2. surface. 2. 3 Drying systems Chemical drying Absorption drying Refrigeration drying Activated alumina or silica Direct expansion or non-cyclic type - uses gel is used - normally a cold refrigerant gas to dual system is used in which alternative drying produce a low temperature and re-activation processes take place Salt matrix - on exposure Indirect refrigeration or cyclic type - uses a to hot air the crystal can secondary medium such as be returned to its chilled water to cool the air original form Ethylene glycol liquid can be regenerated using fuel gas or steam Deliquescent-chemical dissolves as vapour, is absorbed and must be replaced Drying of compressed air involves the next stage of processing following the after-cooler.
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