Year: 1889

page_text: We LEBRECHT STEINMÜLLER and CARL STEINMÜLLER, Engineers, both of Gummers-
bach, in the German Empire, 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:-
This invention consists in certain specific improvements upon the subject matter of
Letters Patent granted to us and numbered 11,105 A.D. 1884, and has reference to
those types of boilers wherein a separate chamber is connected at each end with the
lower boiler proper which is entirely filled with water or ether liquid so that the said
chamber is partly filled with water and partly with steam, the front connecting pipe
being in communication with the hottest part of the lower boiler proper and the back
one with the cooler part so that circulation takes place up the front pipe and down
the back one.
The present invention consists in certain arrangements within the said upper separate
chamber whereby the production therein of perfectly dry steam or vapour is ensured
without previous superheating or interference with the circulation, and whereby also
the circulating water is prevented from disturbing the still water in the said chamber as
hereinafter setforth.
Our present improvements are applicable particularly to steam generation by water
evaporation for the usual industrial purposes, but also to boilers wherein steam is
generated from mixed or turgid liquids apt to boil up suddenly, whereby difficulty is
experienced in ascertaining the true level of the boiling liquid in the receiver, such
for example as lyes-which are reduced and thickened by evaporation or "inspissu-
tion" for the purpose of recovering soda or other ingredients in the process of manu-
facture of cellulose.
This process as heretofore practised has been long and costly owing to the high
temperature required, and the formation during ebullition of large quantities of foam
or froth, which prevents or greatly interferes with the economic use of steam generated
from the lyes by evaporation.

page_text: By our improvements these difficulties are obviated, and we accomplish our objects
by the apparatus illustrated in the accompanying drawings in which similar letters
refer to analogous parts.
According to the usual construction the hottest liquid charged with steam enters a
plain upper chamber A by the inlet. pipe B from the front and hottest end of the boiler
proper, and circulating through the chamber A returns through the outlet C; steam
is liberated in the chamber and passes away through the main steam pipe but charged
or saturated more or less, with liquid.
According to our invention and referring to the longitudinal and cross section of
the upper chamber only shown in figures 1 and 2 we fix above the inlet B a vertical
extension 6, extending a suitable distance above working water level, to the open top 1
of which we fix a shallow box or it may be a pipe D of suitable dimensions in the
steam space and perforated or open at its top d and end d³, and it may or may not be
provided with slots or perforations in its base. One or more openings e is or are
formed in extension and a chamber E is led therefrom chiefly or entirely below the
water level; it may extend nearly to the outlet Cand be open ended as at e¹, or it
may cover the outlet C and have its end e¹ closed as shown dotted at e²..
The plan figure 3 and cross section thereof figure 4 illustrate a modification of this
arrangement in which tubes are substituted for chambers D and E. From the exten-
sion bare led water tubes g below water level, and steam tubes gl above same; the
tube plate may be flat or segmental as illustrated.
The circulation and separation are the same as above described.
A different arrangement is shown in figures, 6 and 7 which are respectively
longitudinal and cross sections and a sectional plan of the chamber A. With the
lower part of the extension b the chamber E entirely below water level communicates
and leads to the outlet as above described. To the top of the extension b above
water level is fixed the chamber 1) to which a suitable inclination is given, within this
chamber a diaphragm or partition d2 may be advantageously fixed and its open end d¹
may be reduced in area as illustrated.
The water carried off with and by the steam passes into chamber D) and is liberated
chiefly about the part d, and while the dry steam escapes at d' and water falls back in
the course indicated by the arrow below the diphragm d² into extension b and thence
circulates again through E and C._
Plan 8 and cross section 9 illustrate the substitution of tubes for last described
chambers E and D. The water tubes g communicate with extension b below water
level and extend to outlet C as described. The upper tubes g g' in the steam space
are provided with a central receiver d² and the steam drying action is as above
described, for figures 5, 6 and 7.
Another arrangement is illustrated in the sectional elevation and plan respectively
figures 10 and 11. The extension is surrounded by another pipe 62 and its top opens
into the box D above a horizontal diaphragm d over which the water carried off with
the steam flows. The base of box D is inclined towards the said exterior surrounding
pipe 62. The liberated steam escapes dry through the end portion of the top plate
which is left open at d as illustrated while the water returns down the bottom inclined
surface back into surrounding pipe 2 and thence along a horizontal submerged
chamber E as above setforth, or along an inclined pipe E. as illustrated to the
outlet C.
By the use of the above described arrangements it will be obvious that the rising
foaming or frothing of the liquid in the receiver A is effectually prevented; the whole
of the incoming liquid being contained and restricted within the chambers or tubes
specified whilst its contained steam is liberated and escapes perfectly dry as described
into the upper part of receiver A; thus also if by chance froth should form or escape
from the chambers the steam is delivered above it and not in contact with the still
liquid in the chamber A. Neither can the still liquid in A be impinged upon and
disturbed by the circulating water in the case E, or tubes g. Therefore by arranging
the feed delivery in the upper receiver A as at Z deposits settle and are retained there,
and may easily be blown out without liability of overheating the plates.

page_text: The
Having now particularly described and ascertained
on and in what manner the same is to be performed we declare that what we
laim is:
In a steam generator having a separate chamber through which the liquid
circulates and in which steam is liberated.
1. The construction described in reference to figures 1, 2, 3, 4 consisting of the
with outlet C, and
combination with the front end inlet pipe B to chamber A of vertical extension
communicating below water level by chamber E or tubes
above water level with chamber D or tubes gl all arranged as and for the purposes
described.
2. The construction described in reference to figures 5, 6, 7, 8, 9 consisting of
the combination with the front end inlet pipe B to chamber A of extension
communicating below water level either by chamber E or tubes g with outlet C,
and above water level either with inclined chamber D having internal diaphragm d
and open end d' reduced or not in area, or with tubes g' having intermediate
receiver d all arranged as and for the purposes described.
3. The construction described in reference to figures 10 and 11 consisting of
the combination with the front end inlet pipe B to chamber A of extension b having
affixed to its open top a chamber D with diaphragm d² and base inclined towards
and communicating with surrounding pipe below diaphragm d2 and connected
to outlet pipe C by chamber E or inclined pipe E¹ below water level all arranged
substantially as and for the purposes setforth.
4. The combination with the separate combined steam and water chamber A
connected to the body of the boiler as specified and to which are applied any of
5 the steam drying devices hereinabove described and claimed of feed inlet pipe Z
and for the purposes set forth.
Dated this 5th day of April 1889.
J. C. CHAPMAN, Fel. Inst. Patent Agents,
70, Chancery Lane, London, W.CH,
Agent for Applicants.