Method of Feeding Tubulous Feed-water Heaters with Purified Water.
Year: 1894

page_text: Date of Application, 27th Nov., 1894
Complete Specification Left, 27th Aug., 1895-Accepted, 26th Oct., 1995
PROVISIONAL SPECIFICATION.
Method of Feeding Tubulous Feed-water Heaters with Purified
Water.
1, WILHELM SCHMIDT, of Wilhelmshöhe near Cassel, Villa Henkel, in the
Province of Hesse-Nassau, Kingdom of Prussia, German Empire, Civil Engineer
do hereby declare the nature of this invention to be as follows:-
--
The waste heat of boiler-furnaces has since long been utilized for heating the
feed-water; and the most perfect exhaustion of the said waste heat has been
obtained by the use of tubulous feed-water heaters, for instance by such consisting
of a spiral or spirals of pipes. There is, however, with feed-water heaters of this
kind combined a serious drawback consisting in the clogging of the spirals by the
sediments of the impure water. The purpose of my invention is to overcome the
said drawback; and I attain my object by the method hereinafter more fully
described.
In order to make my invention more clear, I refer to the accompanying drawing,
in which a is the boiler proper; the furnace of the same, e a casing arranged
upon the boiler; da flue arranged centrally within said casing; e a tubulous feed-
water heater arranged between casing e and flue d; f a cover adapted to close the
upper opening of said flue, and g' the chimney.
Besides the feed-water heater e, which consists of spirally wound pipes, there is
connected with the plant another feed-water heater h, the pipes 9 of which are
straight. These pipes are held by two plates i dividing the inner space of the feed-
water heater into three chambers, the top-chamber and the foot-chamber being
connected by said pipes g.
Said top-chamber is connected by means of a pipe k with a reservoir 1, the lower
portion of which is connected by a pipe m with the lower portion of the boiler a.
The foot-chamber of feed-water heater his connected by pipe n with a pump o,
the latter in its turn being connected by pipe p with the upper end of the feed-
water heater e. The lower end of the latter is connected by pipe 9 with the upper
portion of the boiler a.
Another pump r, the suction-pipe (not shown) of which is connected with the
supply of the fresh feed-water, is connected by means of its delivery-pipe s with the
lower end of the middle chamber of the feed-water heater ; the upper end of sail
chamber is connected by pipe t with the upper portion of the boiler a.
arrangement works as follows:-
This
The hot water contained within boiler a is sucked by means of pump o slowly
through the reservoir l, and through the pipes g of the feed-water heater h, and is
pumped thereafter through pipe p into the feed-water heater e. At the same time,
the fresh feed-water delivered by pump is forced through the middle chamber of
the feed-water heater h, wherein it is heated by means of the hot water flowing in
opposite direction through the pipes g. The heated fresh feed-water then enters
the boiler a through the pipe t.
It will thus he seen, that the fresh impure feed-water after being subjected to a
preliminary heating within the feed-water heater is fully heated within the boiler
proper. The impurities contained in the water are thus caused to separate, but
cannot precipitate because of the vehement motion of the water within the boiler.
Therefore, the water with the separated sediments suspended in it is caused slowly

page_text: to flow through the reservoir 1, wherein the sediments may precipitate. The heat
of the purified water is then used by means of the apparatus for the preliminary
heating of the impure water; the latter is forced into the boiler, as described,
whilst the cooled purified water is forced by pump o into, and through, the feed-
water heater e, from whence it flows back to the boiler, thus completing its circuit.
By raising the cover of flue d more or less, the action of the furnace-gases
upon the feed-water heater e may be regulated as desired.
Dated this 27th day of November 1894.
By Geo. II. Rayner,
37 Chancery Lane, London, W.C., Agent for the Applicant.
Method of Feeding Tubulous Feed-water Heaters with Purified
Water.
I, WILHELM SCHMIDT, of Ballenstedt on the Harz, in the Duchy of Anhalt,
late of Villa Henkel at Wilhelmshöhe near Cassel, in the Province of Hesse-
Nassau, Empire of Germany, Civil Engineer 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 waste heat of boiler-furnaces has since long been utilized for heating the
feed-water; and the most perfect exhaustion of the said waste heat has been obtained
by the use of tubulous feed-water heaters, for instance by such consisting of a
spiral or spirals of pipes. There is, however, with feed-water heaters of this kind
combined a serious drawback consisting in the clogging of the spirals by the
sediments of the impure water. The purpose of my invention is to overcome the
said drawback; and I attain my object by the method hereinafter more fully
descubed.
In order to make my invention more clear, I refer to the drawing sent in with
Provisional Application, in wluch a is the boiler proper; the furnace of the same,
c a casing arranged upon the boiler; da flue arranged centrally within said casing;
e a tubulous feed-water heater arranged between casing cand flue d; f a cover
adapted to close the upper opening of said flue, and g' the chimney.
Besides the feed-water heater e, which consists of spirally wound pipes, there is
connected with the plant another feed-water heater h, the pipes g of which are
straight. These pipes are held by two plates & dividing the inner space of the
feed-water heater into three chambers, the top-chamber and the foot-chamber being
connected by said pipes g.
Said top-chamber is connected by means of a pipe k with a reservoir 1, the lower
portion of which is connected by a pipe m with the lower portion of the boiler a.
The foot-chamber of feed-water heater is connected by pipe n with a pump o, the
latter in its turn being connected by pipe p with the upper end of the feed-water
The lower end of the latter is connected by pipe q with the upper
portion of the boiler a.
heater c.
Another pump r, the suction-pipe (not shown) of which is connected with the
supply of the fresh feed-water, is connected by means of its delivery-pipes with
the lower end of the middle chamber of the feed-water heater ; the upper end of
said chamber is connected by pipet with the upper portion of the boiler a.
This
arrangement works as follows:-
The hot water contained within boiler a is sucked by means of pump o slowly
through the reservoir 1, and through the pipes of the feed-water heater h,
and is pumped thereafter through pipe p into the feed-water heater e.
ame, the inesh fecd-water delivered by pump is forced through the middle
At the same

page_text: chamber of the feed-water heater h, wherein it is heated by means of the hot
water flowing in opposite direction through the pipes g. The heated fresh feed-
water then enters the boiler a through the pipe t.
It will thus be seen, that the fresh impure feed-water after being subjected to a
preliminary heating within the feed-water heater h is fully heated within the boiler
proper. The impurities contained in the water are thus caused to separate, but
cannot precipitate because of the vehement motion of the water within the boiler.
Therefore, the water with the separated sediments suspended in it is caused slowly
to flow through the reservoir 1, wherein the sediments may precipitate. The heat
of the purified water is then used by means of the apparatus h for the preliminary
heating of the impure water; the latter is forced into the boiler, as described,
whilst the cooled purified water is forced by pump o into, and through, the feed-
water heater e, from whence it flows back to the boiler, thus completing its circuit.
By raising the cover of flue d more or less, the action of the furnace-gases
upon the feed water heater e may be regulated as desired.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The method of continuously purifying feed water, consisting in preliminarily
heating the fresh water; leading it through the hot boiler water; causing the feed-
water thus fully heated to effect the aforesaid preliminary heating of the fresh
water, and letting it on its way thereto deposit its impurities; re-heating the
purified cooled feed-water, and leading it into the boiler-water, for the purpose as
described.
2. The method of continuously purifying feed water consisting in preliminarily
heating the fresh water; leading it into the hot boiler water; causing the mixture
of the boiler water and of the feed water thus fully heated to effect the aforesaid
preliminary heating of the fresh water, and letting it on its way thereto deposit
its impurities, re-heating the purified cooled feed-water, and leading it back into
the boiler water, for the purpose as described.
Dated this 26th day of August 1895.
WILHELM SCHMIDT.
By Geo. H. Rayner,
37 Chancery Lane, London, Agent for the Applicant.