Improvements in and relating to Apparatus for Preventing Incrustation in Steam Boilers.
Year: 1891

page_text: Date of Application, 21st Apr., 1891-Accepted, 23rd May, 1891
COMPLETE SPECIFICATION.
[Communicated from abroad by THE NYE BOILER CLEANER COMPANY, of
501 Kirk Building, Syracuse, New York, United States of America.]
Improvements in and relating to Apparatus for Preventing
Incrustation in Steam Boilers.
I, HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings in the County of Middlesex, 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 purpose of this invention is to climinate the mineral substances from the
feed-water entering the boiler and thus prevent incrustation of the latter.
And to that end the invention consists essentially of one or more pans situated
in the upper part of the interior of the boiler, and the feed-water pipe having its
discharge end in one end of said pan or pans as hereinafter more fully described and
specifically set forth in the claims.
In the annexed drawing, Fig. 1 is a side view of a boiler provided with my
invention, a portion of the boiler shell being broken away to show the devices for
eliminating the extraneous mineral substances from the feed water, Fig. 2 is a trans-
verse section of the same, and Fig. 3 is a detached vertical longitudinal section of
the pans with the feed-water-pipe and blow-off pipe attached thereto.
Similar letters of reference indicate corresponding parts.
B represents the boiler, and ce the flues through which the products of com-
bustion pass.
P and P¹ represent two pans which are arranged end to end and communicate
with each other at their junction. Said pans are situated in the upper part or
steam space of the boiler and extend lengthwise thereof.
In new boilers suitable supports for the pans may be applied to the boiler shell,
but for supporting the pans in boilers already in use I prefer to employ suitable
metallic posts or trestle tt mounted on the top row of flues cc and carrying upon
their tops the aforesaid pans as illustrated in Figs. 1 and 2 of the drawing.
I also preferably incline the pans toward one end of the boiler, and extend the
feed-water-pipe a through the top portion of the boiler shell and into the elevated
end of the pan P and terminate it with its discharge end sufficiently below the top
of said pan to cause said end of the feed-water pipe to be immersed in the water
in the pan.
To the bottom of the opposite end or lower end of the pan P' I attach the blow
off pipe a' which is extended through the boiler-shell and provided at the exterior
thereof with the blow-off cock d.
At the junction of the two pans P P₁ I preferably arrange an overflow shelf b
extending across the interior of one of said pans and slightly below the top thereof
as shown in Fig. 3 of the drawing.
The effect of the described apparatus is as follows:-
When the boiler is heated and generating steam the pans P P¹ are enveloped in
steam and consequently the water contained therein is intensely heated.
The feed-water when forced into the boiler issues from the immersed end of the
pipe a and commingles with the hot water in the pans and is subjected to the
intense heat of steam. This sudden change of the temperature of the feed-water
causes all mineral substances to precipitate in the pans, and only the purified water
overflows from the pans and descends to the water space of the boiler. Inasmuch
as the pans are not subjected to the impingement of fire and are constantly
enveloped in steam when the boiler is heated, the mineral substances gathered in
said pans remain in a granular or amorphous state, and by opening the blow-off

page_text: cock d said substances are blown out of the pans and through the blow-off pipe a'
by the pressure of the steam in the boiler.
I do not limit myself to any particular number of pans to be used in a boiler
inasmuch as that depends on the length of the boiler. It is also obvious that in a
boiler of ordinary length a single pan may be made of sufficient length to answer
the purpose of my invention. The pans are introduced into the boiler through the
manhole thereof and are easily set upon their supports inside of the boiler and
coupled together end to end.
The form of the supports of the pans depends somewhat on the style of boiler to
which the pans are to be applied.
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 correspondents, I declare that what I claim is :-
1. The improved preventive of incrustation of steam boilers, consisting of one
or more pans situated in the upper part of the boiler, and the feed-water pipe
having its discharge end in one end of said pan or pans as set forth.
2. The combination with a steam boiler, of two or more pans disposed successively
end to end lengthwise of the boiler in the upper part thereof and inclined towards
one end, the feed water pipe having its discharge end in the elevated end of said
pans, and a blow-off pipe connected to the lower end of said pans, substantially as
described and shown."
3. The combination, with a steam-boiler, of the pans P P situated in the upper
part of the boiler and arranged end to end and communicating with each other
at their junction, the overflow shelf b in one of said pans, the feed-water pipe a
having its discharge end in one end of said pans, and the blow-off pipe a¹ connected
to the opposite end of the pans, substantially as described and shown.
LA 1001
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.