An Improved Apparatus for the Purification of Feed Water for Steam Boilers
Year: 1898

page_text: Date of Application, 30th Dec., 1898-Accepted, 18th Feb., 1899.
COMPETE DPECIFICATION.
An Improved Apparatus for the Purification of Feed Water for
Steam Boilers,
I, AUGUST PFISTER, of Bopfingen, in the Empire of Germany, Inventor, 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 present invention relates to apparatus for feeding steam boilers, and more
especially to the provision of an apparatus for the purification of the feed water
of boilers. The principle on which the apparatus is constructed consists in passing
the feed water, before its entrance into the water chamber of the boiler, into pipes
specially arranged in the steam space and intended to retain the calcareous and
other impurities held in suspension in the water, as will be described in the course
of the present description and specified in the claims.
The annexed drawing giving, by way of example, one form of construction of
the invention, represents a vertical longitudinal section through a steam boiler fitted
with a water purifying apparatus.
This latter consists of a box or casing B placed in the steam space or chamber
of the boiler, and receiving the feed water through a tube A which passes by means
of a water tight joint M through the wall of the said boiler, and extends into the
box or casing B to near the bottom of this latter. Towards the upper part of the
box or casing B, this latter is provided with an aperture or opening extending
through its entire width. At the level of this aperture is fixed a trough or tube D
open at its upper side, and so placed as to have a
front part of the boiler, the said trough or open tube being open at its extremity, and
slight inclination towards the
placed in a second trough or open tube E in which it is suspended, and is secured
to the inner walls of this second trough or open tube which latter is slightly
inclined towards the rear part of the boiler and is open at that end but closed at
its front end, and stops short a slight distance from the wall of the box or casing B.
This latter trough or open tube is fixed in a third trough or open tube F', in such a
manner as to leave between its bottom and that of the trough or open tube Fa
sufficient space or clearance for the passage of the water. This latter trough or
open tube, fixed to the box or casing B, is slightly inclined towards the frout part
of the boiler, and it is open at its corresponding extremity, which latter overhangs
a funnel G, having a discharge pipe H. The trough or open tube F which supports
the two other troughs or open tubes and the box or casing B are supported by the
tube L which forms the combustion flue, by means of straps I, J, which embrace
or surround at their upper ends the trough or open tube and the box or casing B,
and at their bottom or lower ends the cylindrical chamber or flue L.
The water arriving through the feed pipe A in accordance with the demands of
the consumption, as indicated by the water gauge of the boiler, fills up the water
box or casing B. The said water then flows out through the aperture into tlie
trough or open tube D, which it traverses throughout its entire length, at the front
end of this latter falling into the second trough or open tube E which it also flows
along the entire length of, to fall, at the rear extremity of this second trough or
open tube into the third trough or open tube F which it flows through, falls into
he funnel G and is finally discharged into the boiler through the tube H, which
G-D

page_text: latter passes round the outside of the tubular furnace flue in order to supply the
feed water to the lower part of the said boiler.
The water becoming heated in the water box or casing B, deposits, whilst slowly
traversing the different troughs or open tubes hereinabove described, the impurities
which it holds in suspension, as well as the calcareous salts. This arrangement
or device thus prevents the incrustation of the boiler, and in consequence renders
the use of solvents, such as caustic soda, etc., for dissolving the incrustations, un-
necessary, and permits a rapid and easy cleansing of the boiler to be effected, a
cleansing, moreover, which a man working single handed can effect in a few hours.
Instead of employing the superimposed and upwardly open tubes or troughs 1.
E, F, the feed pipe A may be connected directly with a tube extending for the
entire length of the steam space or chamber, bent at its front end in order to return
towards the rear end of the boiler, whilst falling in a gentle slope, to the mean
level of the water in the boiler.
This apparatus which is of a construction of much greater simplicity than those
of the same kind actually in use, can be adapted for application to steam boilers
of all descriptions, by constructing it of appropriate dimensions to the local con-
ditions, without in any way altering the principle of the invention.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. An apparatus or device for the purification of the feed water of boilers,
characterized by a winding slightly inclined water way or passage, arranged in the
steam space or chamber, and intended to cause the feed water to flow or pass
slowly through a long course or passage during which it will deposit its impurities.
2. In an apparatus or device for the purification of the feed water for steam
boilers, the combination of a feed water pipe with a water box or casing, placed
in the steam space or chamber, and a system of troughs or open pipes superimposed
and slightly inclined, arranged in connection with the said water box or casing..
3. In an apparatus or device for the purification of the feed water for steam
boilers, a tube connected directly with the feed pipe, and forming a continuation
thereof, the said tube extending the entire length of the steam space or chamber
of the boiler, and bending downwards at its front end, in order to return by a
gentle slope to conduct the feed water to the mean level of the water in the boiler
4. In an apparatus or device for feed water purification such as that claimed
in the first claim, the combination of a feed water pipe; of a water box or casing
situated in the steam space or chamber of a steam boiler, into which water box o
casing the feed water pipe enters and extends to near the bottom of the said wate
box or casing of an aperture formed in the upper part of the front wall of the
water box or casing; of a trough or pipe open at the top, placed at the heigh
of the above mentioned aperture, slightly inclined towards the front part of th
boiler, and open at its front end to allow the water to flow out of it; of a secon
trough or open pipe to the interior side walls of which the first one is fixed, ex
tending to within a short distance of the front wall of the water box or casing
open at its rear end and fixed to the interior side walls of a third trough or ope
pipe, which latter is secured to the water box or casing, and is open at its from
end for the discharge of the water; and lastly of a funnel provided with a tul
conducting the purified feed water to the lower part of the boiler, substantially a
hereinabove described and represented in the annexed drawing.
J. P. BAYLY,
18, Fulham Place, London, W., Agent for the Applicant.