Title: Drying apparatus

Abstract: Granular solid material is dried in a vertically extending annular chamber formed between inner and outer cylindrical walls by a current of high temperature inert drying gas of high humidity passed downward through the material. Material enters the chamber under gravity through a slot in the inner wall, which slot extends round the full periphery of the inner wall, and is removed from the bottom of the chamber by a variable speed discharge system, the rate of entry through the slot being governed by the rate of discharge from the bottom of the chamber so that the top of the column of material is of frusto-conical form. The spent drying gas stream, less a quantity which is discharged, is used to dilute the products of a fuel in air, the high temperature mixture thus formed constituting the drying gas. The quantity discharged has a mass equal to that of the fuel and air forming the products of combustion. An upward current of cooling air may be passed through the lower portions of the column of material.

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Inventors: Barr, Derek J. (London, GB)

Application Number: 763541
Filing Date: 1977-01-28
Publication_date: 1979-03-20
Assignee: Barr & Murphy Limited (London, GB2)
Primary Class(es): 34/503 34/168, 34/169, 34/179, 432/14, 432/101
Other Classes:
US Patent Ref:

552127	Dec, 1895	Howie	34/168.
1308942	Jul, 1919	French	34/167.
4008994	Feb, 1977	Numasaki et al.	34/168.

Other Refs:
Primary Examiner: Camby, John J.
Assistant Examiner:
Attorney: Wenderoth, Lund & Ponack