Improvements in Flat or Prismatic Evaporating Pans for the Treatment of Salt.
Year: 1888

page_text: Date of Application, 1st Dec., 1888
Complete Specification Left, 29th Aug., 1889-Accepted, 19th Oct., 1889
PROVISIONAL SPECIFICATION.
Improvements in Flat or Prismatic Evaporating Pans for the
Treatment of Salt.
Mrs. MALOINE FLÄSCHENDRÄGER and Mr. HERMANN FLÄSCHENDRÄGER both
of Arnshall near Arnstadt (Schwarzburg-Londerhausen) in the Empire of Ger nany
owners of the Arnsball Saline Works, do hereby declare the nature of this invention
to be as follows:-
My Invention relates to improvements in flat or prismatic evaporating pans with
direct firing for the treatment of Salt and consists in constructing in the evaporating
pans which may have a flat or prismatic form a heating boiler having a rim and
provided with one or more water or flue tubes. This boiler is further furnished with a
lid or cover having bent over bevil edges which has for object of preventing the grains
of Salts formed on the surface during the evaporation of the Salt solution in the pan
and settling at the bottom thereof from entering the said boiler. This arrangement
ensures a better evaporation as well as a rational consumption of the fuel.
In carrying my Invention into practice I provide an evaporating pan, a heating
boiler which extends nearly the whole length of the pan and is provided with vertical
sides with two or more water or flue tube and with a lid or cover whose edges are bent
over so as to be inclined or bevil.
The boiler is a little shorter than the pan on account of the direct firing and of the
flues. A longitudinal opening is formed along the top of the former below the lid
through which the ebullition is communicated to the pan for evaporating purposes
causing the formation of large grains of Salt. The boiler is further provided with outlet
pipes through which it is emptied and cleared.
HUGHES, SON & Co.,
38, Chancery Lane, W.C., Agents to the Applicants.
COMPLETE SPECIFICATION.
Improvements in Flat or Prismatic Evaporating Pans for the
Treatment of Salt.
Mrs. MALOINE FLÄSCHENDRAGER and Mr. HERMANN FLÄSCHENDRAGER both of
Arnshall near Austadt (Schwarzburg Londenhausen) in the Empire of Germany
owners of the Arnshall Iron Works, 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:-
Our invention relates to flat or prismatic evaporating pans for the treatment of
salt, and consists in constructing in the evaporating pan, which may have a flat
or prismatic form, a boiler having a rim, and provided with one or more water or
flue tubes. The boiler is further furnished with a lid or cover, having bent over
bevelled edges, which has for its object to prevent the grains of salt solution in
the pan and those settling at the bottom thereof from entering the said boiler.
This arrangement ensuring a better evaporation, as well as a rational use of fuel.
In the accompanying drawing Fig. 1 and 2 are respectively a longitudinal and
cross section of a prismatic evaporating pan for salt, constructed according to our
invention. A flue tube (or several if required) is placed inside the said pan, and
heated by the furnace F.
The gases of combustion escaping from the tube D may be conveyed further in
any suitable manner; but are caused to pass in the example shown through the
side flues of the pan, thus heating the same. These side flues could also be heated
by a separate fire. Over the flue tube D is arranged a cover plate in duplicate.

page_text: Figs. 3 and 4, show respectively in longitudinal and cross section a flat evaporating
pan for salt.
A is the pan B the boiler which extends the whole length of the pan,
and whose sides are in close proximity to the flue tubes D. C is the cover plate
with bent over bevelled edges. F is the furnace for the flue tubes, and being
the flues of the pan.
The boiler is on account of the direct firing and of the arrangement of the flues
made a little shorter in front and at the rear than the pan. An opening is left
at in the boiler B along the top of each longitudinal side thereof, through which
opening passes without ebullition into the pan the salt water boiling under
pressure in the boiler the said water being freely evaporated therein, whereby large
grains of salt are formed. 9 is an outlet through which the boiler is emptied and
cleaned.
slight
Owing to the flue or fire tube D placed in the boiler there is obtained a more
rapid heating of the salt water, as well as a better evaporation thereof. This
treatment leading to a thoroughly rational use of the fuel. As each grain of salt
is formed on the surface of the briny solution required to be evaporated, and as
such grains are formed and increase in size mostly in the centre of said solution.
The cover plate C placed over the flue tubes prevents the precipitated grains of
salt from going across to these tubes, while the salt depositing upon the said cover
plate is reinoved therefrom by means of suitable scrapers. Whatever may be the
yield of the salt solution subjected to treatment, a pipe z Figs. 3 & 4, is arranged
below the cover plate, and leads from the rear side of the fire place or furnace to
a box A arranged at the back and colder part of the pan, and hence constantly
conveys the colder portion towards the hotter portion of the saline solution, which
greatly enhances the circulation thereof.
Having now particularly described and ascertained the nature and particulars
of our said invention and in what manner the same is to be performed we declare
that what we claim is,
A pan for evaporating salt heated by direct firing, the use of flue tubes covered
by a lid or plate, substantially as and for the purpose described.
2. In flat or prismatic pans for evaporating salt heated by direct firing the com-
bination therewith of a boiler B having vertical sides one or more flue tubes D
and a lid or plate C. covering the said boiler B leaving a free space along the side
thereof, substantially as and for the purposes described.
Dated this 29th day of Ak
1000
HUGHES, SON & Co.,
38, Chancery Lane, W.C., Agents for the Applicants.