Improvements in Water Tube Steam Generators.
Year: 1897

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c., Act, 1883), as required by
the decision of the Comptroller General of the 7th day of December 1898.
Improvements in Water Tube Steam Generators.
I, JAMES HERMANN ROSENTHAL, of 147, Queen Victoria Street, in the City
of London, Engineer, do hereby declare the nature of this invention to be as
follows:
1
This invention, which relates to steam generators of the water tube type and
more especially such as are adapted for marine purposes, has for its object to
provide in combination therewith, as an integral part of the boiler, improved
means for removing impurities from the feed water before it enters into circula-
tion through the water tubes and thus prevent incrustation thereof.
In carrying out the invention a special water purifying drum or reservoir
is combined with the boiler so as to form a settling chamber for the feed water
supplied thereto, and it is conveniently situated in proximity to but over the
water level of the main steam and water drum. This additional drum or settling
chamber is connected with the steam space of the main drum by a pipe which
extends above the water level in the purifying drum or chamber so that while
providing for steam communication between the drums it prevents direct passage
of water from one to the other. The feed water is forced into the settling
chamber through a feed check valve and nozzle connected to its upper side,
the feed water being discharged in the form of spray into the steam space
thereof so that it becomes highly heated and the incrustation forming salts
are precipitated in the settling chamber or reservoir. The feed water purifying
drum or settling chamber is maintained about half full of water, and on that
level being attained the water passes out by downcomer pipes connected by
preference near each end of the chamber and terminating at their lower ends
in the mud-drum or bottom collector of the boiler whence the water passes into
circulation through the boiler tubes in the usual way. In order to prevent the
salts 'deposited in the purifier from passing with the water by way of the down-
comers into the boiler proper the purifier drum is furnished with a series of
diaphragms or obstacle plates extending across the bottom of the drum under
the water level and similar plates placed intermediately and depending from
the steam space into the water. These plates may be secured by snecks or other
fastenings so as to be removable and whilst they allow of the free passage of
the purified feed water they serve to trap any impurities which settle in the
drum. The feed water is also by this means allowed time to become heated
to steam temperature so that the sulphates and carbonates are deposited in the
drum and it is freed from air and thus the water passing by the downcomers
into the boiler contains little or no incrustation forming matter. Milk of lime

page_text: may be introduced into the purifier drum if necessary to prevent salt in the water
causing acidity or having any corrosive effect.
The downcomers at each end of the purifier drum may be connected to the
ordinary horizontal type of mud-drum below, or to the collector as above men-
tioned; but in some cases the usual horizontal müd-drum is dispensed with
and the downcomers are connected to, short yertical mud-drums at their lower
ends and to which the bottom collector or section of the boiler headers is con-
nected by short nipples having oblique ends the openings to the nipples being
preferably on the lower side.
Dated this 1st day of October 1897.
WALLACE FAIRWEATHER,
Of the Eirm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, St. Vincent Street, Glasgow, :
Agent for the Applicant.
COMPLETE SPECIFICATION (AMENDED)....
Improvements in Water Tube Steam Generators.
I, JAMES HERMANN ROSENTHAL, of 147, Queen Victoria Street, in the City
of London; 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:-
This invention, which relates to steam generators of the water tube type and
more especially such as are adapted for marine purposes, has for its object to
provide in combination therewith as an integral part of the boiler, improved
means for removing impurities from the feed water before it enters into circula-
tion through the water tubes and thus prevent incrustation thereof.
The invention is illustrated by the accompanying drawings in which Figure 1
is a
a longitudinal vertical section of a water tube steam generator fitted with
a modification of the improved feed water purifier. Figure 2 is a transverso
section as at the line -y in Figure 1. Figures 3 and 4 are views corresponding
to Figures 1 and 2 showing a modified construction of the boiler and feed water
purifier.
".
In carrying out the invention, and as represented in Figures 1 and 2 of
these drawings, a special water purifying drum or reservoir A is combined with
the boiler so as to form a settling chamber for the feed water supplied thereto,
and it is conveniently situated in proximity to but over the water level of the
main steam and water drum B of the boiler, which latter may be of ordinary
construction. This additional drum or settling chamber A is connected with
the steam, space of the main drum B by a pipe C which extends above the water
level in the purifying drum or chamber A so that while providing for steam
communication between the drums A and B it prevents direct passage of water
from one to the other. The feed water is forced into the settling chamber A
through a feed check valve D) and nozzle E connected to its upper side, the feed
water being discharged in the form of spray into the steam space of the drum A
so that the water becomes highly heated and the incrustation forming salts
are precipitated in the settling chamber or reservoir A. The feed water puri-
fying drum or settling chamber A is maintained about half full of water, and
on that level being attained the water passes out by downcomer pipes F con-

page_text: In
nected by preference near each end of the chamber A and terminating at their
lower ends in the mud-drum or bottom collector G of the boiler whence the
water passes into circulation through the boiler tubes H in the usual way.
order to prevent the salts, deposited in the purifier, from passing with the water
by way of the downcomers F into the boiler proper the purifier drum A is
furnished with a series of diaphragms or obstacle plates I extending across
the bottom of the drum under the water level and similar plates I placed inter-
mediately and depending from the steam space into the water. These plates I, I',
may be secured by snecks or other fastenings so as to be removable, and whilst
they allow of the free passage of the purified feed water they serve to trap any
impurities which settle in the drum A. The feed water is also by this means
allowed time to become heated to steam temperature so that the sulphates and
carbonates are deposited in the drum A and it is freed from air and thus the
water passing by the downcomers F into the boiler contains little or no incrusta-
tion forming matter. Milk of lime may be introduced into the purifier drum A
if necessary to prevent salt in the water causing acidity or having any corrosive
effect.
The downcomers F at each end of the purifier drum may be connected to the
ordinary horizontal type of mud-drum below, or to the collector as above men-
tioned; but in some cases as indicated by Figures 3 and 4, the usual horizontal
mud-drum is dispensed with, and the downcomers F are connected to short
vertical mud-drums G' at their lower ends and to which the bottom collectar
or section G of the boiler headers is connected by short nipples g having oblique
ends at g, the openings to the nipples being preferably on the lower side.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I wish it to be
understood that I make no general claim to connecting the purifying drum
with the steam and water spaces of a steam generator, nor to causing the feed-
water to fall in a shower through the steam space of the purifying drum; but
I declare that what I claim is:-
1. A feed water purifier integral with a water tube steam generator of the
marine type, and composed of an auxiliary drum or settling chamber whereinto
the feed water is delivered, the said drum being connected above the normal
water level within it to the steam space of the boiler drum and having its water
space connected by downcomers with the mud drum or bottom collector of the
boiler or with short vertical mud drums nippled to the bottom collector sub-
stantially as described and shown in the accompanying drawings.
2. In a water tube steam generator the combination with a feed water purifier
of short vertical mud-drums connected by downcomers to the purifier and by
nipples to the bottom collector or section of the generator and arranged to
intercept sedimentary matter in the water passing into the boiler substantially
as described and shown in the accompanying drawings.
Deted in 2nd 1 of W. 1900
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, St. Vincent Street, Glasgow,
Agent for the Applicant."
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, St. Vincent Street, Glasgow,
Agent for the Applicant.