Improvements in Apparatus for Cooking, Concentrating, and Evaporating Liquids.
Year: 1898

page_text: Improvements in Apparatus for Cooking, Concentrating, and
Evaporating Liquids.
I, EDWARD SHAW, of Broad Street House, in the City of London, Engineer,
do hereby declare the nature of this invention to be as follows:-
-
In the Specifications of former Applications for Letters Patent numbered 5803
of 1898 and 19262 of 1898 I have described apparatus in which liquid such, for
example, as a solution of sugar and glucose may be cooked, concentrated or
evaporated in a practically continuous manner and at a comparatively low
temperature. Such apparatus comprises an externally-heated tube or coil through
which the liquid is fed continuously by means of a pump, a collecting chamber
into which the said tube discharges and in which the treated liquid and the
vapour driven off by the heat separate, and means such as an air or vapour pump
for removing from said chamber the vapour and for maintaining a low pressure
in the said chamber and the externally heated tube, the treated liquid being dis-
charged separately.
With apparatus of this kind it has been found that the rate of feed cannot
be satisfactorily controlled independently of the pressure in the cooking coil
and chamber as the syrup is liable to be forced through the feed pump
and cooking coil by the pressure of the atmosphere when the pressure in the
collecting chamber is reduced.
Now, in order to obviate this difficulty, the discharge pipe of the feed pump is,
according to the present invention, provided with a suitably loaded valve that will
only open when the pressure against it exceeds atmospheric pressure.
The rate
of feed is thus capable of being completely controlled by the pump and is not
influenced by the vacuum in the cooking coil and collecting chamber.
Dated this 10th day of October 1898.
Improvements in Apparatus for Cooking, Concentrating, and
Evaporating Liquids.
I, EDWARD SHAW, of Broad Street House, in the City of London. Engineer,
o hereby declare the nature of this invention and in what manner the same is
[Price 8d.

page_text: to be performed to be particularly described and ascertained in and by the
following statement:-
In the Specification of former Applications for Letters Patent numbered 5803
of 1898 and 19262 of 1898 I have described apparatus in which liquid such, for
example, as a solution of sugar and glucose may be cooked, concentrated or
evaporated in a practically continuous manner and at a comparatively low
temperature. Such apparatus comprises an externally-heated tube or coil through
which the liquid is fed continuously by means of a pump, a collecting chamber
into which the said tube discharges and in which the treated liquid and the
vapour driven off by the heat separate, and means such as an air or vapour pump
for removing from said chamber the vapour and for maintaining a low pressure
in the said chamber and the externally heated tube, the treated liquid being dis-
charged separately.
With apparatus of this kind it has been found that the rate of feed cannot
be satisfactorily controlled independently of the pressure in the cooking coil
and chamber as the syrup is liable to be forced through the feed pump
and cooking coil by the pressure of the atmosphere when the pressure in the
collecting chamber is reduced.
Now, in order to obviate this difficulty, the discharge pipe of the feed pump is,
according to the present invention, provided with a suitably loaded valve that will
only open when the pressure against it exceeds atmospheric pressure. The rate
of feed is thus capable of being completely controlled by the pump and is not
influenced by the vacuum in the cooking coil and collecting chamber.
In the accompanying drawing an apparatus of the kind described in the Speci-
fication of my said Application No. 19262 of 1898 and having my present improve-
ments applied thereto is illustrated in sectional elevation. 1 is a tank for
containing uncooked syrup which is fed therefrom by a pump 2 to a cooking
coil 3 which is contained within a steam chamber 4; the coil discharges
into a collecting chamber 5 wherein the vapour and the treated
syrup are separated. 6 is a jet condenser and 7 an air or vapour pump connected
therewith for maintaining a low pressure in the cooking coil and collecting
chamber.
The discharge pipe 8 of the feed pump 2 is fitted with a suitably loaded valve 9
that will only open when the pressure against it exceeds atmospheric pressure,
and thus constitutes an artificial load on the pump 2 which is thereby enabled
to work steadily irrespective of variations of pressure in the cooking coil which
will always occur. By this means the flow of syrup through the coil may be
maintained at a predetermined rate and the syrup passed through the coil will,
if the pressure and temperature of the heating steam be constant, be evenly
cooked to the required degree.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. Apparatus for cooking, concentrating and evaporating liquids comprising an
externally heated cooking tube, a pump in communication therewith, and an
intermediate resistance member in said communication and constituting an arti-
ficial load on the pump, thereby maintaining practically a constant predeter-
mined flow of the syrup through the tube irrespective of variations of pressure in
the cooking tube and attaining an even cooking thereof, substantially as described.
2. Apparatus for cooking, concentrating and evaporating liquids comprising an
externally heated cooking tube, a syrup supply pipe in communication therewith,
a supply pump in communication with the said supply pipe, and a pressure valve
in said pipe at a point between said pump and cooking tube and constituting
an artificial load on the pump, and thereby maintaining practically a constant
predetermined flow of the syrup through the tube irrespective of variations of

page_text: pressure in the tube and attaining an even cooking thereof, substantially as
described.
an
3. Apparatus for cooking, concentrating and evaporating liquids comprising
externally heated tube, a supply pipe in communication therewith.
a pressure supply device in communication with the supply pipe and supplying
syrup to said pipe at a pressure above the pressure in a cooking tube, and a
resistance member in said supply pipe at a point between said pressure supplying
device and the tube and constituting an artificial load upon said supplying device,
thereby maintaining practically a predetermined flow of syrup through the
cooking tube irrespective of variations of pressure in said tube and attaining an
even cooking of the syrup, substantially as described.
4. Apparatus for cooking, concentrating and evaporating liquids comprising
an externally heated cooking tube, a separating and collecting chamber in com-
munication with the exit end of the tube, means for varying the pressure in said
chamber, a syrup supply pipe having communication with the inlet end of said
tube, a device supplying syrup under pressure exceeding the pressure in said tube
and separating chamber, and a resistance member in said supply pipe between the
cooking tube and the pressure supply device, whereby the flow of the syrup is
not effected by the variations of pressure in said pressure chamber and an even
cooking of the syrup obtained substantially as described.
5. Apparatus for cooking, concentrating and evaporating liquids constructed,
arranged and operating substantially as herein described and shown in the
accompanying drawing.
Dated this 8th day of August 1899.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C. Chartered Patent Agent.