Solids feed

Enclosure (with venting air heaters 1 Divided solids feed (far end ). -... 

The conveyor and collector parts are thoroughly insulated to reduce heat losses in diying and other heating operations. Operating control is maintained usually by control of the exit-gas temperature, with the inlet-gas temperature varied to compensate for changing feed conditions. A constant solids feed rate must be maintained. 

Adiabatic. Control gas flow and/or solids feed rate so that the heat of reaction is removed as sensible heat in off gases and solids or heat supphed by gases or solids. 

Rake-Lifting Mechanisms These should be provided when abnormal thickener operation is probable. Abnormal thickener operation or excessive torque may result from insufficient underflow pumping, surges in the solids feed rate, excessive amounts of large particles, sloughing of solids accumulated between the rakes and the bottom of... 

Hydraulic cylindrical tank classifier Om tp (M-F) Hydraulic form of overloaded thickener. Siphon-Sizer (N-F) uses siphon to discharge underflow instead of rotating rake. 1.0 to 40 1.4 mm to 45 im (25 mm) 1 to 150 Not critical 0.4 to 15 20 to 35 0.75 to 11 Two-product device giving very clean underflow. Requires relatively little hydraulic water (2 t/t solids feed). Used for washing, desliming, and closed circuit grinding. 

Efficient separations, but requires 3 t hydraulic water/t solids feed. Used to produce exceptionally clean underflow fractioned into... 

FIG. 22-42 Four alternative modes of contimioiis-flow operation with a foam-fractionation column (1) The simple mode is illustrated hy the solid lines. (2) Enriching operation employs the dashed reflux line. (3) In stripping operation, the elevated dashed feed line to the foam replaces the solid feed line to the pool. (4) For combined operation, reflux and elevated feed to the foam are both employed. 

In applications in which solids need to be fed to the bed continuously, the smaller distributor surface area, cylindrical geometry and rotation of the CFB should lead to fewer solids feed points per unit of capacity than are needed in a conventional bed ... 

Figure 12-25. SIMULAR reaotion oalorimeter Computer oontrolled solids feed. (Source Hazard Evaluation Laboratory Ltd.)...

The success of continuous processing heavily hinges on the speed and continuity of the feed materials into the process. A main problem with the continuous processing of energetic composites is the surging in the solids feed, making the process sequence hazardous and product... 

All emissions will be very low and will comply with local regulations. Waste products are about 0.2 kg/kg of total solids feed. Note, this total solids feed includes both feed plastic and the solids used as make-up in the process. 

Sherrington (S10) has presented a static model of the granulation loop operating in the snowballing mode. The model combines the solution phase theory in Eq. (106) with the material balance across the granulator. The recycle ratio defined as recycle/raw solid feed, is given by... 

Typically it took about 160 to 200 seconds to inject a pulse of about 455 kg coarse tracer particles into the bed pneumatically from the coaxial solid feed tube. It can be clearly seen from Figs. 38 to 42 that the tracer particle concentration increases from essentially zero to a final equilibrium value, depending on the location of the sampling port. The steady state was usually reached within about 5 minutes. There is considerable scatter in the data in some cases. This is to be expected because the tracer concentration to be detected is small, on the order of 4%, and absolute uniformity of mixing inside a heterogeneous fluidized bed is difficult to obtain. 

Figure 43. Force probe responses for probe penetration from 0.05 m to 0.30 m— 0.13 m from jet nozzle elevation, 46 m/s jet velocity, no solid feed.

In the remainder of this chapter, for simplicity, we use a discrete form for the PSD given by the fraction of a particular size R in the solid feed. For identical particles of the same density, this is FBg(R)IFBo, the ratio of molar, or mass, flow rates. The outer integral in equation 22.2-3 then becomes a summation, and the equation may be rewritten as ... 

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