Page 116 - Chemical Process Equipment - Selection and Design

88 TRANSFER OF SOLIDS

\ 1

r Pressure, 3 to 8 oz

(n)
Figure J.lS-(continued)

5.25
EXAMPLE 5.5 HP = - [11.4(120) + 6.5(30) + 201 = 8.31.
Comparison of Redler and Zippered Belt Conveyors 1000
Soda ash of bulk density 301b/cuft is to be moved 120ft
horizontally and 30 ft vertically at the rate of 350 cuft/hr. Compare F~~ a closed belt,
power requirements of Redler and zippered belt conveyors for this
service.
A 3-in Redler is adequate: u=-= 350 83.3fpm,
0.07(60)
which is well under the 200 fpm that could be used,
L, = 300, L, = 120, L, = 30.
which is within the range of Table 5.7(a),
Use Eq. (5.26):
tons/hr = 350(30)/2000 = 5.25
HP = 0.001{(300/30 + 5)83.3 + [120/16 + 2(30)]5.25)
Take constants from Table 5.7(b) for a Redler. = 1.60.

REFERENCES 8. D.W. Dodge and A.B. Metzner, Turbulent flow of non-newtonian
systems, AIChE J. 5, 189 (1959).
1. T.H. Allegri, Materials Handling Principles and Practice, Van Nostrand 9. G.H. Ewing, Pipeline transmission, in Marks’ Mechanical Engineers
Reinhold, New York, 1984. Handbook, McGraw-Hill, New York, 1978, pp. 11.134-11.135.
2. A.G. Bain and S.T. Bonnington, The Hydraulic Transport of Solidr by 10. FMC COT. Material Handling Equipment Division, Catalog 100, Homer
Pipeline, Pergamon, New York, 1970. City, PA, 1983.
3. M.V. Bhatic and P.N. Cheremisinoff, Solid and Liquid Conveying 11. F.J. Gerchow, Conveyors, pneumatic, in Encycl. Chem. Process. Des.
System, Technomic, Lancaster, PA, 1982. 11, 278-319 (1980); Chem. Eng., (17 Feb. 1975, 31 Mar. 1975).
4. A.J. Bobkowicz and W.G. Gauvin, The effects of turbulence in the flow 12. H.V. Hawkins, Pneumatic conveyors, in Marks’ Mechanical Engineers
characteristics of model fibre suspensions, Chem. Eng. Sci. 22, 229-247 Handbook, McGraw-Hill, New York, 1978, pp. 10.50-10.63.
(1967). 13. J.W. Hayden and T.E. Stelson, Hydraulic conveyance of solids in pipes,
5. R. Clift, Conveyors, hydraulic, Encycl. Chem. Process. Des. 11, 262-278 in Zandi, Ref. 27, 1971, pp. 149-163.
(1980). 14. W.G. Hudson, Conveyors and Related Equipment, Wiley, New York,
6. H. Colijn, Mechanical Conveyors for Bulk Soli&, Elsevier, New York, 1954.
1985. 15. E. Jacques and J.G. Montfort, Coal transportation by slurry pipeline, in
7. Conveyor Equipment Manufacturers Association, Belt Conveyors for Considine (Ed.), Energy Technology Handbook, McGraw-Hill, New
Bulk Materials, Van Nostrand Reinhold, New York, 1979. York, 1977, pp. 1.178-1.187.