Improvements in Apparatus for Concentrating Solutions, Drying Substances, and like purposes.
Year: 1889

page_text: Date of Application, 13th Dec., 1889
Complete Specification Left, 6th Sept., 1890-Accepted, 6th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Concentrating Solutions, Drying
Substances, and like purposes.
I DOUGLAS HERMAN of West Park St. Helens, in the County of Lancaster,
Chemical Engineer, do hereby declare the nature of this invention to he as
follows:-
The invention relates to circular or annular pans rotating about a vertical axis, and
the object is to render such pans more efficient and more readily manipulated.
Apparatus under my invention consists essentially of a circular or annular pan
having depending flanges dipping into a liquid, gaseous pressure being used beneath
the pan
to carry the main weight thereof, the residual weight being carried by rollers
or equivalent devices. The said pan is enclosed in a furnace in which heated gases
and products of combustion preferably from gaseous fuel pass over the pan.
The furnace is so made that a portion of the pan projects so that access can be
obtained to every portion of the pan during its rotation, or doors or openings are pro-
vided for that purpose. Fixed or movable scrapers or appliances are used for moving
solid matter in and from the pan. The pan is caused to rotate by any convenient
apparatus.
Dated this 19th day of December 1880
COMPLETE
SPECIFICATION.
Improvements in Apparatus for Concentrating Solutions, Drying
Substances, and like purposes.
I, DOUGLAS HERMAN, of West Park, St. Helens in the County of Lancaster,
Chemical Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
---
The invention relates to circular or annular pans rotating about a vertical axis
and used for concentrating solutions and drying substances by evaporation of liquid
or moisture. The objects are to render such pans more efficient and more readily
manipulated and to reduce the power required to actuate them.
Apparatus under my invention consists essentially of a circular or annular pan
having depending flanges dipping into a liquid, gaseous pressure being used beneath
the pan to carry the main weight thereof, the residual weight being carried by rollers
or equivalent devices. The said pan is enclosed in a furnace in which heated gases
and products of combustion, preferably from gaseous fuel, pass over the pan.
The furnace is so made that a portion of the pan projects beyond the walls and
access can be obtained to every portion of the pan during its rotation; or doors or
openings are provided in the furnace walls for that purpose.
Fixed or movable scrapers or appliances are used for moving solid matter in the
pan from the centre towards the circumference. The pan is caused to rotate by
any convenient apparatus.

page_text: e is a
pan having depending flanges b, dipping into water c, contained in a well d.
pipe through which air or gas is forced into the space f enclosed by the water c,
pan a, and flanges b, so as to nearly float the pan. g are rollers on which the rim of
the pan rests with the residual weight. h is a furnace enclosing the pan and provided
with air and gas inlets i and j and waste gas flues k. 1 opening in the furnace through
.which the edge of the pan projects so that access may be obtained to it.
m gear for
giving rotary motion to the pan. n scraper for directing the contents of the pan from
the centre towards the circumference.
Fig. 4 is a sectional view of a modification of pan in which the residual weight
is carried by rollers g beneath the depending flanges b which flanges forms the rim
of the pan.
Having now particularly described and ascertained the nature of the said inven-
tion and the manner in which the same to be performed I declare that what I
claim is :-
First. Rotating concentrating and drying pans carried in parts or entirely by
gaseous pressure.
Second. Rotating concentrating and drying pans with depending flanges dipping
into liquid substantially in the manner and for the purpose set forth.
Third. Concentrating and drying apparatus constructed substantially as herein
'set forth.
Dated this Fifth day of September 1890.
Per pro J. T. KING,
W. B. Johnson,
Agent.