Page 114 - Chemical Process Equipment - Selection and Design

Figure 5.12. Bucket elevators and conveyors. (a) Spaced bucket elevator. (b) Bucket conveyor for vertical and horizontal travel. (c)
Discharge of pivoted buckets on horizontal path. (d) Spaced buckets receive part of their load directly and part by scooping the bottom. (e)
Continuous buckets are filled as they pass through the loading leg with a feed spout above the tail wheel. (f) Centrifugal discharge of spaced
buckets. (g) Discharge mode of continuous buckets.

TABLE 5.7. Speed and Horsepower of Drag-Type Conveyors of (bl Factors F, G, and Kfor Use in the Power Equation for Three
Redler Design" Sizes of Units
(a) Typical Speeds (ft/min)*
19" Unita
itlaterid
E
G
F
MATERIAL 1000 1000 2000 3000 ---
HANDLED Conv. Elev. Conv. Conv.
Beam dry navy 1.1 2.02.6
Coal 125 125 80 150 Bipardanate of soda, dry, pulvw
Coke 40 40 40 40 ,zed 2.2 2.6 4.64.3
5.02.4
Flyash 30 30 30 30 Bran
Grain (Whole) 125 125 80 250 Celluloee acetate dry, cow 4.4 8.52.6
Cement granular dry Portland
(Processed) 125 100 80 150 2.1 4.83.4
Salt 125 100 80 150 Clay. d& lumpy 2.1 4.02.8
Clay pulverized
3.8 9.93.7
Wood (Chips) 100 80 80 150 Coal: minus X" slack dry withl'e
(Sawdust) 100 100 80 150 pmpOltlOn fine3 1.7 3.1 2.6
Coal. minus %" alack moderatel
ret 2.3 4.23.1
Coal minus %" slack very wet 1.8 3.63.2
a HP = 0,001 (FL + GH + K) (tons/hr), where H = rise (ft), L = Coal: minus 1%" slack dry or
damp
horizontal run (ft), F, G, and Kare factors from Table (b); factor E is not Coal, sized wet or dn 1.8 3.32.6
1.5 2.82.4
usedbin this formula. Coconut. ahdded 1.9 3.72.1
1.5 3.02.1
Series 1000,2000, and 3000 differ in the shapes and sturdiness of Coffee. ground 2.1 4 31.7
Corn flakes
the flights. Flour. wheat 2.1 4.32.3
Fuller'a earth dy grand=
2.1 4.44.0
(Stephens-Adamson Mfg. Co.). Lime:<burned'y puisk " lump
2.0 3.53.8
Lige, GbErned small lumpa
and dust 2.5 4.93.6
Lime. fine with tendenoy to paeb 3.0 5.84.1
6.0 18.1 2.83.2 3.8
Lime hydrated 1.5
salt, hry granulated
Salt rock 1.5 2.63.6
Sand. silica co- dry 1.7 3.23.8
Sand very fine, dry 1.9 3.84.0
Sawdust dry 3.4 7.62.5
Soda ad light
soybean kea1 2.8 1.5 6.63.6
2.8
3.1
Starch lump 1.4 2.52.4
Starch: pulverized 3.4 n.93.4
Supar. dry granulated 2.0 3.94.8
Sugar bmwn 3.0 5.64.1
Wheal. dm fzirly clean 1.2 2.23.0
Wood chips. dry 2.0 3.7 1.9
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