Page 283 - Chemical Process Equipment - Selection and Design

250 DRYERS AND COOLING TOWERS
TABLE 9.74 continued)

(c) Pan Dryer
Sodium Potassium Arsenic
Thiosulphate Zeolite Pentoxide
Dryer diameter 6ftOin. 2ft3in. 8ftOin.
Dryer depth 2ftOin. 1 R 0 in. 2ftOin.
Capacity (Ib product) 12 cwt 14 Ib 2; ton/day
Initial moisture (% w/w basis) 37 40 35
Final moisture (% w/w basis) 0 1 2-3
Method of heating steam steam steam
Atmospheric (a) or vacuum (b) (b) 26 Hg (a) 60 Ib/in.*/gauge (b)
Drying temperature: material (OF)
Drying temperature: shelf (“F) 153C
Bulk density product (Ib/ft3)
Drying time (hr/batch) 5 3 8
Material of construction ss MS ss
[Courtesy A.P.V.-Mitchell (Dryers) Ltd., Williams-Gardner, 19711.

Condensate or
hot water return

by customer
(a)

Figure 9.7. Tumbling and agitated heated dryers for atmospheric and vacuum batch operation. (a) Double cone tumbler;
performance data in Table 9.6(a) (Pennsalt Chem. Co.). (b) V-shaped tumbler. (c) Ribbon agitated cylinder;
performance data in Table 9.6(b). (A) jacketed shell; (B) heads; (C) charging connections; (D) discharge doors; (E)
agitator shaft; (F) stuffing box; (G) shaft bearings; (H) agitator blades; (J) vapor outlets; (K) steam inlets; (L)
condensate outlets; (M) discharge siphon for shaft condensate (Bu$ovak Equip. Diu., Bluw Knox Co.) (d) Paddle
agitated cylinder. Performance data in Table 9.6(b). (e) Horizontal pan with agitator blades. Data are Table 9.6(b).