Improvements in Tubular Vacuum Pans.
Year: 1888

page_text: RES
Date of Application, 1st June, 1888
Complete Specification Left, 1st Mar.. 1889
Complete Specification Accepted. 13th Apr., 1839
PROVISIONAL SPECIFICATION.
Improvements in Tubular Vacuum Pans.
I, FRANK WALTER SCOTT, Junior, of 44, Christian Street, Commercial Road, in
the County of Middlesex, Engineer, do hereby declare the nature of this Invention,
a communication to me from abroad by August Freitag, of Spaarndammer Straat,
Amsterdam, in the Kingdom of Holland, Engineer, to be as follows:-
In the lower part of a vertical shell, by preference cylindrical, are arranged two or
more chambers each provided with through tubes which are fixed in tube plates
forming the top and bottom wall of the chamber and which are united to the shell.
The upper faces of the tube plates are by preference slanting down towards one or more
larger down or through passages for discharge; one central passage being preferred
thus making the chamber annular. The bottom tube plates may be straight, horizontal,
or may follow the slope of the upper tube plates. The upper chamber or chambers
may be of less depth than the lower one or ones. By means of pipes steam can be
admitted to the interior of the chambers, say from the bottom of the pan, but in such
manner that steam may be admitted to any or all of them, or from one to the
other. In order to observe the level and the condition of the liquid under
treatment flat or tubular gauge glasses are provided at the side of each
chamber, and for this purpose each chamber is provided with an enclosed, by
preference half-circular, vertical through passage opposite the gauge pane. These
improvements afford, amongst others, the advantages of increased heating surface, of
boiling with a low initial depth of liquid with an increase of depth as desired, and of
the use of a low pressure of steam or vapour. The level movements and condition
of the liquid or masse cuito are also conveniently observed.

page_text: Improvements in Tubular Vacuum Pans.
I, FRANK WALTER SCOTT Junior of 44 Christian Street Commercial Road in the
County of Middlesex Engineer do hereby declare the nature of the said invention
(a communication from August Freitag of Spaarndammer Straat Amsterdam in the
Kingdom of Holland Engineer, and in what manner the same is to he performed to
be particularly described and ascertained in and by the following statement :-
:-
This invention and the manner in which it is or may be carried into effect will be
understood by reference to the accompanying drawing in which Figure 1 is a vertical
section and Figure 2a plan of a-tubular vacnum pan. constructed according to this
invention. In the lower part of a vertical shell A by preference cylindrical-as-shown-
are-arranged-two or more, in this case three chambers each provided with through
tubes CCC respectively, some of the tubes being formed as stays or solid stays
may be used. These tubes are fixed in tube plates B B B forming the top walls,
and-tube plates D-D1 D2 forming the bottom walls of the chambers and which are
united to the shell A for instance as shown tiz, by angle irons. The upper faces of
the tube plates B B B are for preference slanting down towards a large central down
or through passage E E¹ E' (or it may be two or more through passages in each
chamber serving for discharge. The bottom tube plates D D D may be straight
horizontal or may follow the slope of the upper tube plates B B₁ B'. The upper
chamber or chambers may as shown be of less depth than the lower one or ones. By
means of pipes F F F steam can be admitted to the interior of the chambers B D,
BD and B D², say from the bottom of the pan, but in such manner that steam may be
admitted at pleasure to any or all of them. H H H are pipes with cocks for
admitting steam from one tube system to the other, cocks or valves being provided
accordingly.
In order to observe the level and the condition of the liquid under treatment flat
or tubular gauge glasses are provided at the side of each chamber, and for this purpose
each chamber is provided at R R R2 with an enclosed by preference half circular
vertical through passage as shown in vertical section and plan section in the detail
views Figures 3 and 4 where the half round chamber G has an opening at top and
bottom and is inserted steam-tight hetween the tube plates of a chamber. I is the gauge
glass or pane.
By means of the arrangement of the tubo systems above one another, and by being
able to heat each system separately, one is enabled to boil with the least possible
initial depth of liquor in the apparatus and to increase the depth as desired without
arriving at a depth which would be too great. The advantage of a low depth of liquor
is well known, but nevertheless most existing vacuum pans boil with a great depth of
liquor, and a very high temperature in the heating coils, because the total heating
surface of these apparatus in proportion to their capacity requires this.
In the tubular vacuum pans herein before described a very large heating surface
is obtainable and it becomes possible to boil with low pressure stean or vapour which
offers great advantages. It also offers the advantage of a heating surface the extent
of which can be varied within useful limits.

page_text: Compared with other tubular pans this apparatus with separate heating systems
when applied to the boiling of sugar and syrup has the advantage that a strong coarse
grain can be formed with a low depth of juice, and that on letting go the charge one
or more heating systems may be laid off as required.
By means of the arrangement of gauge glasses described the level and movements
of the boiling contents in the systems and in the whole pans can be observed in the
coil heated pans.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me
by my foreign correspondent I declare that what I claim is :-
:-
First. Constructing vacuum pans with two or more superposed tube systems with
intermediate space or spaces and with pipes and cocks or valves for admitting steam
to one two or more or all systems together, or with pipes and cocks or valves for
admitting steam from one system to the other or with both pipe and cock systems
substantially as and for the purposes set forth.
Second. Constructing the upper tube plate sloping towards the through passage or
passages for discharge substantially as set forth.
Third. The application of a chamber communicating with the interior of the
apparatus above and below a tube chamber and with a lateral aperture covered by a
gauge glass or pane for observing the contents from the outside of the apparatus
substantially as described and shewn.
Fourth. The construction of vacuum pan shown on the drawing.
Dated this 1st day of March 1889.
FRANK WALTER SCOTT, JunIOR.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.