Concentrating evaporators – Spray type – Gaseous current
Patent
1981-08-10
1983-12-20
Bascomb, Jr., Wilbur L.
Concentrating evaporators
Spray type
Gaseous current
159 4A, 159 4B, 159 16R, 159 481, 159 4CC, B01D 114, B01D 118
Patent
active
044215940
ABSTRACT:
Disclosed is a method of producing granulated products from a suspension, which comprises in general the steps of spraying the suspension in a suspension spraying zone, introducing a heat-carrier in the form of a spiral flow to a zone disposed beneath the sprying zone, drying the suspension by the heat-carrier concurrently and countercurrently therewith and separating simultaneously fine fractions of the dried material by means of the same flow of the heat-carrier, with drawing a spent portion of the same, treating thermally the granules produced by drying countercurrently with the aforesaid heat-carrier upon their moving downward in a spiral to a temperature sufficient to ensure the desired product properties, withdrawing processed granules from the thermal treatment zone. Also disclosed is an apparatus implementing the foregoing method, which in general incorporates a chamber whose cross-sectional area is variable in height, suspension spraying means mounted in the upper portion of the chamber having the largest dimensions, heat-carrier introducing means mounted in the lower portion of the chamber and arranged in spirals, whose pitch and diameter is designed variable along the height of the chamber and increase toward the mounting site of the suspension spraying means, pipes provided in the body of the chamber for removing spent gas, and means for discharging a thermally treated product from the lower portion of the chamber.
REFERENCES:
patent: 1471765 (1923-10-01), Wilson
patent: 1513622 (1924-10-01), Manning
patent: 1613334 (1927-01-01), Symmes
patent: 3423173 (1969-01-01), McFarlin et al.
patent: 3618655 (1971-11-01), Lockwood
Bildjukevich Viktor L.
Demidovich Boris K.
Dubrovsky Nikolai N.
Lebedkova Valentina A.
Meleshko Vyacheslav J.
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