Improvements in or connected with Steam Generators and Steam Generator Furnaces.
Year: 1889

page_text: Date of Application, 29th Oct., 1889
Complete Specification Left, 29th July, 1890-Accepted, 30th Aug., 1890
PROVISIONAL SPECIFICATION..
Improvements in or connected with Steam Generators and
Steam Generator Furnaces.
I, JOHN THOM, of Inverkip, in the County of Renfrew, North Britain, Engineer,
do hereby declare the nature of my said invention to be as follows:-
This invention has mainly for its object to provide improvements by which the
circulation of water in marine, Cornish, Lancashire and other steam generators having
like or equivalently arranged or disposed furnaces shall be more vigorous than exists
in those generally designed and disposed at or near the bottom or lower part of the
generator and also, which shall prevent or tend to prevent deposit on the crown
or upper part of the furnaces; or, in other words, which shall keep the crowns
clean.
A steam generator provided with improvements according to this invention consists
as follows: On the exterior of the furnace I provide channel or trough shaped
devices, or plates, and clamp them onto the furnace, they being constructed, in such a
manner, that they can be readily applied, shifted, removed, or reapplied. The devices
or plates are open at or near the bottom and also at the top, and when applied to the
furnace, each forms a conduit, open, or provided with openings, at the bottom and
top. In these conduits, the water becoming heated by the furnace, flows rapidly
upwards and round and over the surface of the shell of the furnace, ejecting it over
the crown, and thereby sweeping it, and at the same time causing the cooler water at
the lower portion to enter the lower part of the channel, so promoting and main-
taining a vigorous circulation of the water causing the cooler water from the lower
part of the generator to be forced upwards and heated. It is not necessary that the
channels or troughs, or plates should fit or touch the furnace in order to effect a
circulation.
The devices may, in some cases, be carried down from the sides or lower part of the
furnace to or near the bottom of the steam generator; this descending portion, in such
cuses, consists of a laterally enclosed conduit or pipe.
In one arrangement according to my invention I provide a plurality of, what may
Le conveniently termed, half channel or trough device, or plates, on the furnace, and
53 disposed on the opposite sides of it that a device or plate on one side is adjacent to
a space on the opposite side of the furnace not covered by a device, and vice versa.
By this means, beyond a good circulation of water being obtained, I cause the surface
(for practically the whole length if desired) of the furnace to be swept over by the
streams of water issuing from the exit orifices of the devices and flowing in opposite
di.ections, thereby preventing the deposition of deleterious matters upon its crown.
If the half-channels or plates he not provided as described alternately all along, they
may be applied at parts where the greatest liability of deleterious deposits, exists, and
where it has been found the furnace covers are most liable to collapse, or become
injured by heat; this point or feature is particularly pertinent to the case of marine
steam generator furnaces.
In a modified arrangement according to the invention the half channel or trough
devices, or plates, are arranged opposite each other and clamped to the furnace.
A convenient manner of clamping the channel or trough devices or plates to the
furnace by rods or bolts or the like, and tightening them up by screws.
The channel or trough devices or plates may only be put on one side of the
furnaces, if it is desired to cause a certain current to be set up.
Dated this 28th day of October, 1889.
CHEESBROUGH & ROYSTON,
Applicant's Agents.

page_text: QUATIE DIECIFICATION.
Improvements in or connected with Steam Generators and
Steam Generator Furnaces.
1, JOHN THOM, of Inverkip, in the County of Renfrew, North Britain, 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 has mainly for its object to provide improvements which shall prevent
deposit on the crown or upper part of the furnaces, of marine, Cornish, Lancashire
and other steam generators having like or equivalently arranged or disposed furnaces,
or, in other words, which shall keep the crowns clean and prevent deposit of oil or
dirt on the furnace top, and which also shall prevent overheating of the furnace at
the part most liable to collapse, and at the same time cause the circulation of colder
water from the bottom of the boiler to the top of the furnaces all the time the boiler
is steaming. It has also for its object to render the circulation of water in such
boilers more vigorous than that which exists in those generally designed.
A steam generator provided with improvements according to this invention
consists as follows:-On the exterior of the furnace I provide channel or trough
shaped devices, or plates, and clamp them onto the furnace, they being constructed
in such a manner, that they can be readily applied, shifted.removed, or reapplied. The
devices or plates are open at or near the bottom and also at the top, and, when
applied to the furnace, each forms a conduit, open at the bottom and top. In these
conduits the water becoming heated by the furnace flows rapidly upwards and round
over the surface of the shell of the furnace, being ejected over the crown, and
thereby sweeping it, and at the same time causing the cooler water at the lower
portion to enter the lower part of the channel, so promoting and maintaining a
vigorous circulation of the water, and causing the cooler water from the lower part
of the generator to be forced upwards and heated. It is not necessary that the
channels or troughs, or plates should fit or touch the furnace in order to effect a
circulation.
In lieu of clamping the devices onto the furnaces they may be supported from the
stays or the shell thereof; or they may be supported by studs, but it is preferred to
avoid the use of studs for this purpose.
The devices may, in some cases, be carried down from the sides or lower part of
the furnace to, or near to the bottom of the steam generator; this descending portion
in such cases consists of an enclosed conduit or pipe.
In one arrangement according to my invention I provide a plurality of, what may
be conveniently termed, half-channels or trough devices or plates, on the furnace, and
so disposed on the opposite sides of it, that a device or plate on one side is adjacent to
a space on the opposite side of the furnace not covered by a device, and vice versa.
By this means, I cause the surface of the furnace (for practically the whole length, if
desired) to be swept over by the streams of water issuing from the exit orifices of the
devices and flowing in opposite directions, thereby preventing the deposition of
deleterious matters upon its crown. If the half-channels or plates be not provided as
described alternately all along they may be applied at parts where the greatest
liability of deleterious deposits exists, and where it has been found the furnace crowns
are most liable to collapse, or become injured by heat: this point or feature is
particularly pertinent to the case of marine steam generator furnaces.
A convenient manner of clamping the channel or trough devices or plates to the
furnace consists in connecting the opposite parts or halves by rods or bolts or the like,
and tightening them up by screws. Or the channels or the sides of the channels may
he lengthened, if desired, till they overlap the sides of the channels on the opposite
side of the furnace and be connected together by bolts, keys, or other suitable means.
Or, according to another mode, the channels may he connected together at the top of
the furnace only and allowed to lie over the furnace and rest on the shell of the boiler.

page_text: The channel or trough devices or plates may only be put on one side of the furnace
if it is desired to cause a certain current to be set up, or on any desired part of the
furnace. For example, they may be put on the furnace close to the back tube plate
to insure a good supply of solid water at the hottest part of the tubes and tube plates;
the effect of which is that these surfaces are always kept covered with water, and in
consequence burning or overheating is avoided.
+
The above describes generally the nature of my invention and the object it is
intended to attain, as well as the effects produced by its use, but in order to set it out
in such a manner as to enable others skilled in the art or manufacture to which it
relates, to make and use it, I will now describe it in conjunction with the drawings
hereto annexed. The drawings which form a part of this Specification illustrate the
invention carried out in modified forms or arrangements, and constitute examples
involving the improvements hereunder, which improvements are specially set forth in
the claiming clauses concluding the Specification.
The drawings are marked with figures and letters of reference corresponding with
those used in the following description, and like letters and figures are used to denote
the same or corresponding parts throughout the several views and figures.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shews in sectional end elevation, and Figure 2 in sectional plan, a portion
of a three furnaced marine boiler, the furnaces of which are provided with water
circulating channel or trough devices arranged according to my invention.
Figure 3 shews in sectional end elevation, and Figure 4 in plan, the detailed
construction of the channel or trough devices illustrated in Figures 1 and 2.
Figure 5 shews in sectional end elevation, and Figure 6 in plan, a modified form or
arrangement of the channel or trough devices.
Figure 7 shews in sectional end elevation, and Figure S in plan, a further modified
arrangement of the channel or trough devices.
In the drawings, a designates the steam generator or boiler; b are the furnaces;
and ce are the water circulating channel or trough devices.
The channel or trough devices c, care so constructed that they can be readily
applied, shifted, removed, or re-applied to the furnaces without in any way
interfering with the furnace shell plate; and they are so arranged on the furnace that
they discharge the water they cause to circulate in alternate directions on and over
opposite sides of the furnace crown 1. The means of fixing the devices c, c¹ on the
furnace is illustrated in Figures 3 and 4.
The devices it will be seen are in the form of segmental channels of iron or steel or
other suitable metal, and placed in a group of three, two, c, c, on one side, and one c',
on the other side, intermediately between the channels c c. The two ends of the
channel care provided with cross rods d, and these rods are provided with the rods
or links e, e, the ends c¹ of which take into the flanged projections f on the ends of the
channels 6, 4, to which they are secured by the screw nats h. This arrangement
provides for the ready fixing of the channels c, c¹ on the furnace b, and for the ready
shifting or removal of them.
In the example of my invention illustrated at Figures 1 and 2, I have shewn one set
of three channels c, applied to each furnace b, the channels being of the construction
sliewn and described with reference to Figures 3 and 4, but this construction of the
channels may be modified, for example, they may be constructed as shewn in Figures 5
and 6, and according to the arrangement shewn at the right hand side of the boiler,
or according to that shewn on the left hand side. On the right hand side at Figure 5
the segments c, c', on the wing furnace are the same as those shewn in Figures 2 and 3,
whilst those of the centre furnace are carried down in the form of a conduit at & to
the bottom of the boiler. In the construction shewn in the left hand side of Figure 5,
the inner segments of the wing furnace are not continued to the bottom of the
furnace, but are joined to and communicate with the segments cc. of the centre

page_text: furnace b. By this latter arrangement the segments ee of the left hand furnace take
their supply from the bottom of the boiler through the segments cc of the centrè
furnace.b.
In the case of a two or four furnaced boiler the segmental channels G €1 may
be
constructed and arranged as shown in Figures 7 and 8, according to the plan shewn
at the right hand side, or according to that shewn at the left hand side. In either of
these arrangements the channels of the furnaces 6 are joined and taken down
as a straight duct to the bottom of the boiler; and in the left hand furnace the
channels are also continued in the form of a duet down to the shell of the
boiler, whilst the channels of the right hand furnace bare of the form described
with reference to Figures 3 and 4.
.
The channels are in Figures 6 and 8 shewn placed near the tube plate a¹ of the
boiler, and if desired they may be placed quite close to the tube plate, so as to secure
a good supply and circulation of solid water over the hottest part of the tubes and the
tube plate as above specified.
"By the foregoing.description it will now be plainly seen that the heat imparted to
the water between the furnaces and the channels will cause such water to flow
rapidly upwards therethrough and be discharged over the surface of the top or crown
of the furnace, sweeping or scouring it and preventing thereby the deposit thereon of
any deleterious matters, and at the same time effecting a good circulation of water
generally by disposing the intake of the device. ce near the bottom of the boilers and
the parts where the cooler water is ordinarily found.
1
Instead of the segmental channels being placed precisely as illustrated in the
drawings they can be placed on any part of the furnace and in any number; or they
may be placed on one side only of the furnace, and on one or more furnaces as
lesired. In the case of furnaces constructed in short lengths with flanges; a plate
may be carried from the top of one flange to the top of the next flange to form
channel.
a
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
In a steam generator, the combination with the furnace or furnaces thereof, of
channels or troughs arranged on the furnace alternately on the opposite sides thereof
as, or substantially as described, whereby water is caused to sweep over or scour the
furnace top or crown; for the purposes set forth.
2. Effecting the cleansing or scouring of the crowns of furnaces of the kind herein-
before referred to; by providing or forming channels or troughs on the opposite sides
thereof substantially in the manner described, and causing currents of water to be
discharged over the surface of the top or crown of the furnace from said channels or
troughs: for the purposes set forthi.*
3. The combination with a steam generator furnace, of a channel or trough device
or devices, such as described, and clamping means, such as described, by which said
devices are secured to the furnaces, and whereby they may be readily applied,
removed, or shifted; for the purposes set forth.
4. In a steam generator of the marine or equivalent type, the combination with the
furnace thereof of a device or devices, such as e, arranged on the furnace thereof and
disposed close to the combustion chamber tube plate, and adapted to deliver and
discharge water over the tubes of the generator near said chamber and over said tube
plate substantially as and for the purposes set forth.
5. The water circulating channels or troughs 6, c', constructed and arranged in
connection with the steam generator furnaces as herein set forth with reference to
Figures 1, 2, 3, and 4, of the drawings.
6. The water circulating channels or troughs 6, e¹, constructed and arranged in
connection with the steam generator furnaces as herein described and shewn with
reference to Figures 5 and 6 of the drawings.

page_text: 7. The water circulating channels or troughs e, e constructed and arranged in
connection with the steam generator furnaces as herein described and shewn in
reference to Figures 7 and 8 of the drawings.
Dated this 28th day of July, 1890.
CHEESBROUGH & ROYSTON,
15, Water Street, Liverpool, Applicant's Patent Agents.