Pneumatic conveying horizontal

With hafQes Horizontal drum Double cone revolving around long axis Twin shell Ciihe Twin rotor Tiirhine Paddle mixer Sifter (tiirhosifter) Attrition mill Elevator loading Pneumatic conveying Vibrating... 

But how can we estimate the pressure-loss coefficient A Stegmaier - has summarized horizontal transport for several fine-granular solids by a correla tion which contains some characteristics of the material. The same idea has been used by Weber, who has found a correlation of the pressure-loss coefficient for vertical pneumatic conveyance based on data measured by Flatow. In order to express these models, we first introduce two dimensiitnless numbers... 

Considerably more work has been carried out on horizontal as opposed to vertical pneumatic conveying. A useful review of relevant work and of correlations for the calculation of pressure drops has been given by Klinzing et a/.(68). Some consideration will now be given to horizontal conveying, with particular reference to dilute phase flow, and this is followed by a brief analysis of vertical flow. 

Clark, R. IF, Charles, D. E., Richardson,. 1. F., and Newitt, D. M. Trans. Inst. Chem. Eng. 30 (1952) 209. Pneumatic conveying. Part 1. The pressure drop during horizontal conveyance. 

Legel, D., and Swedes, J., Investigation of Pneumatic Conveying of Plugs of Cohesionless Bulk Solids in Horizontal Pipes, Bulk Solids Handling, 4(2) 53-59 (1984)... 

Figure 9.4. Types of dryers cited in Tables 9.1 and 9.2. (a) Tray or compartment, (b) Vacuum tray, (c) Vertical agitated batch vacuum drier, (d) Continuous agitated tray vertical turbo, (e) Continuous through circulation, (f) Direct rotary, (g) Indirect rotary, (h) Agitated batch rotary (atmos or vacuum), (i) Horizontal agitated batch vacuum drier, (j) Tumble batch dryer, (k) Splash dryer. (I) Single drum, (m) Spray, (n) Fluidized bed dryer, (o) Pneumatic conveying (mostly after Nonhebel and Moss, 1971).

P. Marjanovic, A comparative study of performance characteristics for horizontal and vertical pneumatic conveying in pipelines, Proceedings of the Pneumatech 1. PAC Conference Stratford-upon-Avon, UK, 1982. 

D. Mills, J.S. Mason, P. Marjanovic, A comparison of pressure drops in horizontal and vertical dense phase pneumatic conveying, Proceedings of the 3rd International Conference on Pneumatic Conveying, Pecs, Hungary, March 1985. 

This paper presents mathematical and experimental studies of solids deposition characteristics in the horizontal pipeline of a dense phase slug flow pneumatic conveying... 

A. Levy, Two-fluid approach for plug flow simulations in horizontal pneumatic conveying, Powder Technol. 112 (2000) 263-272. 

Pneumatic conveying systems can be classified on the basis of the angle of inclination of pipelines, operational modes (i.e., negative- or positive-pressure operation), and flow characteristics (i.e., dilute or dense phase transport steady or unsteady transport). A practical pneumatic conveying system is often composed of several vertical, horizontal, and inclined pipelines. Multiple flow regimes may coexist in a given operational system. 

Figure 11.4. Flow regime diagrams on log-log scales for pneumatic conveying of fine particles (from Marcus etal., 1990) (a) Horizontal flow (b) Vertical flow.

Konrad, K., Harrison, D., Nedderman, R. M. and Davidson, J. F. (1980). Prediction of the Pressure Drop for Horizontal Dense-Phase Pneumatic Conveying of Particles. Pneumotransport, 5,225. 

The flow sheet of this process is shown in Figure 26.2. Prepared plastic fluff is sent to a bag filter set on the top deck (Figure 26.1) by a pneumatic conveyer after treatment by a second magnetic separator and an aluminum separator. Then, the plastic fluff is sent to two series of dehydrochlorinators, specially designed, reciprocally rotating twin-screw-type extruders, through a vertical screw conveyer. This equipment is composed of a melter of plastic fluff aud circulator of waste plastic melt. Each is a horizontal type... 

Incremental models track the local conditions of the gas and particles through the dryer, mainly in one dimension. They are especially suit le for cocurrent and countercurrent dryers, e.g., flash (pneumatic conveying) and rotary dryers. The air conditions are usually treated as uniform across the cross-section and dependent only on axial position. This method can also be used to determine local conditions (e.g., temperature) where a simpler model has been used to find the overall drying rate. A two- or three-dimensional grid can also be used, e.g., modeling vertical and horizontal variations in a band dryer or plug-flow fluidized bed. 

Fig. 5.65 Sketch and photograph of a model experiment explaining the different types of build-up in a horizontal pneumatic conveying pipe.

---