Improvements in Apparatus for Evaporating Liquids by Means of Steam.
Year: 1893

page_text: Date of Application, 27th May, 1893
Complete Specification Left, 27th Feb., 1894-Accepted, 12th May, 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Evaporating Liquids by Means
of Steam.
We, ERNEST LATHAM of Mansion House Chambers, in the City of London,
Engineer, and EMILE GEORGE GUYOT of Lea Cut Iron Works, Limehouse, in
the County of Middlesex, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention has reference to evaporating apparatus of the kind in which the
heat of steam passing through pipes is used for evaporating sea or other impure
water for the purpose of producing therefrom water suitable for drinking or boiler
feeding purposes, and it has for object to simplify the construction of such apparatus
and to so construct and arrange the heating tubes that they will act to superheat
or dry the steam produced from the impure water before it escapes from the steam
generating vessel to the condenser, thereby enabling the water produced by the
condensation of such steam to be obtained in a purer condition than is usual in
evaporators wherein priming takes place and the steam is delivered in a wet
condition to the condenser.
Evaporating apparatus for this purpose according to this invention is con-
structed with a number of vertical pipes arranged in pairs one within the other so
as to leave a steam space between them and the outer of which is closed at the top,
the tubes being made of such a length and so arranged in the water evaporating
vessel which encloses them, that their upper ends extend into the steam space above
the working level of the water which is maintained practically constant whilst the
apparatus is at work by any suitable means such as a pump the delivery of which
is adjusted to suit the evaporative power of the apparatus; or by any suitable
float arrangement; or by an overflow pipe connected externally with a series of
bends or syphons the water in which will prevent escape of steam whilst permitting
the escape of excess of water under the hydrostatic pressure of the overflow. The
outer pipes of the several pairs of pipes are secured at their lower open ends to a
tube plate that is arranged to form the bottom of the water evaporating vessel.
The inner and smaller pipes of the several pairs are secured at their lower open
ends to another tube plate. The two tube plates are separated from each other
and are secured between the bottom of the water vessel and a recessed bed plate,
the arrangement being such as to form two superposed chambers the lower of which
is provided with a steam inlet and serves as a steam chamber for supplying steam
to the inner tube of each pair of tubes whence it passes to the steam space between
such tubes, and the upper of which is provided with a water outlet and serves to
receive water of condensation from the lower ends of the larger tubes. The water
vessel, which may be furnished with the usual fittings is provided at the top with a
steam outlet the inner end of which may advantageously terminate in a curved
steam pipe arranged at the top of the steam space in the said vessel and perforated
at the top side only.
By constructing and arranging the steam heating pipes in the manner described,
the steam produced by the evaporation of water in the water vessel will be
effectually dried before escaping to the condenser, by the heat of the steam flowing

page_text: through the annular space formed between the inner tube and the upper exposed
end of the outer tube constituting each pair of tubes.
Dated this 27th day of May 1893.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Evaporating Liquids by Means
of Steam.
We ERNEST LATIIAM of Mansion House Chambers in the City of London
Engineer and EMILE GEORGE GUYOT of Lea Cut Iron Works Limehouse in the
County of Middlesex Engineer do hereby declare the nature of this invention and
what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
in
This invention has reference to evaporating apparatus of the kind in which the
heat of steam passing through pipes is used for evaporating sea or other impure
water for the purpose of producing therefrom water suitable for drinking or boiler
feeding purposes and it has for object to simplify the construction of such apparatus
and to so construct and arrange the heating tubes that they will act to superheat
or dry the steam produced from the impure water before it escapes from the steam
generating vessel to the condenser thereby enabling the water produced by the
condensation of such steam to be obtained in a purer condition than is usual in
evaporators wherein priming takes place and the steam is delivered in a wet
condition to the condenser.
The
Evaporating apparatus for this purpose according to this invention is constructed
with a number of vertical pipes arranged in pairs one within the other so as to
leave a steam space between them and the outer of which is closed at the top the
tubes being made of such a length and so arranged in the water evaporating
vessel which encloses them that their upper ends extend into the steam space above
the working level of the water which is maintained practically constant whilst the
apparatus is at work by any suitable means such as a pump the delivery of which
18 adjusted to suit the evaporative power of the apparatus; or by any suitable float
arrangement; or by an overflow pipe connected externally with a series of bends
or syphons the water in which will prevent escape of steam whilst permitting the
escape of excess of water under the hydrostatic pressure of the overflow.
The outer pipes A of the several pairs of pipes as shewn on the accompanying
drawing are closed at their upper ends and secured at their lower euds to a tube
plate Barranged to form the bottom of the water evaporating vessel C.
inner and smaller pipes D of the several pairs are open at both ends and secured
at their lower ends to another tube plate E. The two tube plates are separated
from each other by a distance piece F and are secured between the bottom of the
water vessel C and a recessed bed plate G, the arrangement being such as to form
two superposed chambers the lower of which H is provided with a steam inlet I
and serves as a steam chamber for supplying steam to the inner tube D of each
pair of tubes (whence it passes to the steam space between the tubes) the upper
chamber J is provided with a water outlet K and serves to receive water of
condensation from the lower ends of the larger tubes A. The water vessel C which
may be furnished with the usual fittings is provided at the top with a steam
outlet L the inner end of which may terminate in a curved steam pipe M arranged
at the top of the steam space in the said vessel C and perforated at the top side
only. The water to be evaporated is admitted to vessel C through a non-return
valve N and the brine or sediment left in the vessel C by the evaporation of the

page_text: water is discharged by the cock O. A drain cock P is provided for discharging
the water of condensation from the vessel H. A gauge glass Q is fitted to enable
the attendant to maintain the proper working level of water in the vessel C.
By constructing and arranging the steam heating pipes in the manner described
the steam produced by the evaporation of water in the water vessel C will be
effectually dried before escaping to the condenser by the heat from the steam
flowing through the annular space formed between the inner tube D and the upper
exposed end of the outer tube A constituting each pair of tubes.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
1. Placing the heating tubes one within the other and securing same in separate
tube plates by one end only to allow for perfect expansion and enabling the
apparatus to be readily taken apart for thorough cleaning and the heating surfaces
to be freed from scale substantially as shewn and described.
2. Constructing and arranging the steam heating tubes so that the hottest part
projects above the water level so as to effectually dry the steam generated from
the water evaporated before its escape to the condenser, by the heat from the
steam flowing through the annular space formed between the inner tubes and
the upper exposed ends of the outer tubes, as herein shewn and described.
3. Generally the construction of the apparatus as shewn and described.
Dated this 26th day of February 1894.
ERNEST LATHAM.
EMILE GEORGE GUYOT.