IMPROVEMENTS RELATING TO STEAM-BOILERS
Year: 1884

page_text: COMPLETE SPECIFICATION.
"
I HENRY HARRIS LAKE of the firm of Haseltine Lake & Co Patent Agents
Southampton Buildings in the County of Middlesex do hereby declare the nature
of said Invention for "IMPROVEMENTS RELATING TO STEAM-BOILERS and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :—
This Invention relates to Lancashire, Cornish, and other cylindrical steam boilers
and consists in combining these with certain devices for increasing the beating
surfaces of the former and causing a better circulation of water in the saine.
The object of the said Invention is to increase the heating surfaces in Cornish
and other cylindrical steam boilers so as to cause a more rapid generation of steam
and a more thorough utilization of the heating power employed, and, at the same
time, facilitate the circulation of water in the same. The Invention, when applied
to boilers of the Cornish-type consists in providing such a boiler having, preferably
three or more flues, with a system of heating tubes located within the said Blues
and communicating with each other, in such a manner as to form a second boiler, as
it were, within the said boiler, but having in common with the latter the same fire-
space and, in some cases, the same feed-water apparatus, and the same steam and
water-chambers.
I will first describe the Invention as applied to boilers having three and four
flues respectively and used in combination with a device for freeing feed-water
from impurities the said device being described in the Specification of Letters
Patent dated October 30th A.D. 1882 N° 5168.
In the accompanying Drawings
Figure 1 is a vertical longitudinal section of a boiler having three flues and a
device for purifying feed water combined therewith.
Figure 2 is a front view of the same.
Figure 3 is an end view of the body of a boiler with three flues provided with
these improvements.
Figure 4 is an end-view of the body of a boiler having four flues and provided
with these improvements.
Figure 5 is a vertical longitudinal section, and
Figure 6 is an end view of the body of a common boiler having two flues
showing these improvements, when such boiler is used without the device for
purifying the feed-water.
D

page_text: Figure 7 shews a common cylindrical boiler provided with the said improvements,
⚫ and
Figure 8 is a front or end-view of the same.
Figures 9 and 10 are vertical longitudinal and transverse sections, respectively,
of another form of combination of a boiler having two flues with a device for
purifying feed water and showing a modified arrangement of the Invention.
def, Figures 1, 2 and 3, and ƒ³, Figure 4, represent heating tubes arranged
within the flues a b and c, Figures 1, 2, 3 and c¹, Figures 4, of a boiler, in such a
manner as to allow of their contracting and expanding independently of the flues
of the boiler surrounding them. The said heating tubes in the lower flues extend
from the rear of the fire-bridges where their ends are closed, along the entire
length of the flues cominunicating with the heating tube or tubes of the upper flue
or tubes by means of the connecting pipes g and h Figure 3, while the upper
heating tube or tubes communicate with the dome of the boiler by means of the
pipe . The feed water pipe r enters the lower heating-tubes a b, extending into
the latter almost to the ends of the same nearest to the fire-bridges. The dome k
communicates with the upper boilers C and B by means of the pipes n and m. lis
a pipe for introducing fresh feed water from the heaters E and F into the upper
boiler B, and p is a pipe for conducting the mixture of fresh feed-water and
circulating water into the branch-pipes 7, 8, and 9 which deliver into the feeding-
pipes of the heating tubes d, and into the main boiler, A, respectively.
In the modified arrangement as shown in Figures 9 and 10 the heating tubes d'
are shown as communicating directly with the boilers of the apparatus for
purifying the feed-water by means of the pipes g' instead of discharging into the
dome of the boiler while in the arrangement shown in Figures 5 and 6, where the
boiler is used without the apparatus for purifying the feed-water the heating-
tubes d' communicate with the upper part of the boiler through the pipe g¹.
In the modification as shown in Figures 9 and 10, a is the pipe for introducing
fresh feed-water into the vertical boiler M, ¹ is the pipe connecting the latter
with another vertical boiler M, and is a pipe through which the feed water
enters the main boiler A. 2, are pipes connecting the upper ends of the said
vertical boilers, M, M, with the upper steam-space of the main boiler A, near the
level of the water in the latter.
In Figures 7 and 8 the heating tubes d" are shewn as connected with a common
cylindrical boiler A fed with feed-water from any suitable source. In this instance
the said heating tubes are fed from the lower part of the boiler A, by means of
the pipes q and 11, and they deliver the circulating mixture of steam and water
into the boiler A again through the pipe g" entering the said boiler near the level
of the water in the same.
I will now describe the operation of the apparatus, referring first to Figures 1
to 4. The feed-water, purified by means of apparatus combined with the boiler,
enters the lower heating tubes de through the pipes 8 (Figure 3) discharging into
the same at t. This point being quite near to the fire, it is obvious that steam will
be at once generated and a most rapid agitation and circulation of steam and water
will ensue extending through the entire system of heating-tubes and causing the
mixture of steam and water to be carried upward through the connecting pipes
and h into the upper heating-tube or tubes ƒ whence it is discharged into the
dome k
The steam generated in the boiler A entering into the said dome simultaneously
with the mixture of steam and water from the heating tubes as above described,
it naturally results that the latter mixture is forced through the pipes m and n
into the boilers C and B of the apparatus for purifying the feed-water. The said
mixture of water and steam, here meeting the fresh feed-water entering the said
boilers C and B through the pipe froin the heaters E and F, or any other suitable
source, carries the same along through the sieve-like or perforated plates arranged
inside the boilers C and B as described in the Specification of the said foriner
Patent causing it to deposit on the said perforated or sieve-like plates the greater

page_text: part of its impurities, while the steam is collected in the steam-reservoir D after
having been freed from its water by condetisation in coming into contact with the
plates of corrugated sheet-metal arranged within the said boilers in the manner
described in the Specification above referred to. The steam may then be taken
from the steam reservoir above described in a dry state, while the feed-water, after
having thus been freed from its impurities leaves the boiler C by means of the
pipe p, whence it passes through the branch-pipes q, and a partly into the main-
boiler A, by means of the pipe q, and partly into the lower heating tubes d and e,
through the pipes 7 and 8, discharging into the same at t in close proximity to the
fire bridges as already stated, thus feeding both the boiler as well as the heating
tubes, with purified feed water.
It appears clear that with the above described arrangement the boiler is
completely filled with water, the same extending even upward into the boilers of
the apparatus for purifying feed-water filling the latter about half. It is thus
rendered possible to work with a very high water level, all danger of the water-
level sinking below the flues being removed, so that the latter can hardly ever
become over-heated. The combination of a boiler containing the said improvement
with the apparatus for purifying feed-water furthermore allows of an increasing of
the heating surface to nearly double its extent, while the volume of the boiler
proper, its ground space and masonry work may be reduced to about one half.
In the arrangement as shown in Figures 9 and 10 a suitable apparatus for
purifying feed-water instead of being mounted above the boiler A in an inclined
position, is arranged in a vertical position at the end of the said Cornish boiler
having but two flues as usual, the heating tubes are fed with purified water directly
from the boiler A through the pipe q' as shown the heating tubes d' discharging
the mixture of steam and water through the pipes g¹ into the respective boilers
M M of the apparatus for purifying the feed-water. Here meeting the fresh feed-
water entering the first of the said boilers M through the feed-water pipe the
process of purifying the said feed-water takes place in the manner already described
with reference to Figures 1 and 2 and the feed-water having entered the second
boiler M', through the connecting pipe, ¹, leaves the boiler M¹ through the pipe ³
which discharges the said feed-water in a purified state into the lower part of the
boiler A. The steam collected in the boilers M and M' mounts to the upper part
of the same, and, having been freed from its water by condensation in coming into
contact with the plates of corrugated sheet-metal y passes from the said boilers
into the upper part, or steam space, of the boiler A through the conuecting
pipes 5, 2.
In applying my Invention to a boiler with two flues and not combined with the
apparatus for purifying feed-water as above described the heating tubes & Figures
5 and 6 are fed from the lower part of the boiler A by means of the pipe q' which
connects with the inner or feed pipes of the heating tubes d', the latter in their
turn communicating with and discharging the water and steam directly into the
upper part of the boiler A again, through the connecting pipes g¹ entering the body
of the boiler at a point situated approximately on the water-line of the boiler A, by
which means the desired circulation is in this instance likewise established.
are
In Figures 7 and 8 the cylindrical boiler A fed with feed water from any
suitable and convenient source is combined with the heating tubes d", in a manner
similar to that just described with reference to Figures 6 and 6. of the Drawings.
In this instance the said heating-tubes d" and their inner feeding-pipes
arranged underneath the cylindrical boiler A and the beating tubes dil are fed from
the lower part of the cylindrical boiler A by means of the pipe q" which connects
with the feeding pipes of the heating tubes the latter discharging their
mixture of steam and water into the upper steam space of the cylindrical boiler A
through the connecting pipes gll, at a point near the level of the water in the
said boiler A, and thus causing a lively circulation of the water and generation of
steam.

page_text: Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is :
First. The combination, with a cylindrical boiler having three or more flues, of
heating tubes arranged within the said flues in such a manner as not to be
directly in communication with the said boiler and having in common there-
with the same fire place and, if desired, the same feed and steam-space, so as to
form as it were a separate boiler within the said cylindrical boiler and being free
to expand independently of the latter, substantially as, and for the purpose,
specified.
Second. The combination with a Cornish or other cylindrical boiler of any
suitable construction, of heating-tubes arranged either within the said Cornish
boiler, or underneath the said cylindrical boiler, and having in common with the
said boiler or boilers the same fireplace and the same feed, steam, and water-space,
the said heating tubes being arranged in such a manner as to discharge the mixture
of steam and water generated in the same either back into the said boiler or boilers
or into some suitable apparatus for purifying the feed-water for the said boiler or
boilers substantially as, and for the purpose, specified.
HASELTINE, LAKE & Co., 2
For the Applicant.