Improvements in and relating to Steam Boilers.
Year: 1898

page_text: Date of Application, 10th Sept., 1898-Accepted, 12th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in and relating to Steam Boilers.
We, GEORGE HERBERT WATSON and EDWIN JAY NOBLE, citizens of the United
States of America, both of 218, La Salle Street, in the City of Chicago, County of
Cook and State of Illinois, United States of America, Manufacturers, 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 relates to steam boilers, marine and stationary, of the general
character known as internal furnace tubular boilers, sometimes called Scotch
Boilers."
It is a principal object of the invention to provide an internal furnace boiler
with a circulating pipe, one or more, but preferably a plurality, extended con-
tinuously and directly through the fire-box or furnace, and communicating with
the lower part of the boiler, at one end thereof, and with the upper part of the
boiler at its other end, so that the cooler water will be conducted by said circulating
pipe or pipes from the lower part of the boiler at one end and be discharged into
either the steam or water space of the boiler at its other end. Thus, according to
this invention, the water may be lifted from the lower and colder part of an
internal furnace boiler at either end thereof and be conducted through the fire
by means of a circulating pipe or pipes to be thence discharged into the upper part
of the boiler at its other end; thus furnishing what may be termed a combined
water tube and Scotch boiler.
Another object of the invention is to provide for a ready and easy access to the
interior of each heating and circulating pipe, independently of the others, to
permit brushing out or cleaning the same from end to end thereof. For this
purpose each heating and circulating pipe has an independent connection with a
header and the latter is provided with removable caps opposite the pipe ends, so
that access to the interior of each pipe can be readily obtained. These circulating
pipes are to be so constructed and arranged that they can be easily disconnected
and removed to afford access to any part of the boiler or internal furnace for the
purpose of cleaning or repairs.
The invention provides for a more rapid and effective circulation; consequently
a more quick generation of steam and a very large economy of fuel; much better
results than usual in the prevention of scale and sedimentary deposits; and greater
facilities for inspection, cleaning and repairs.
Figure 1 is a vertical longitudinal section of an internal furnace boiler, showing
one arrangement of the improved heating and circulating pipes in the internal
furnace, the water being conducted from the lower front part of the boiler through
said circulating pipes to the upper rear part of the boiler.
Figure 2 is a front elevation of the same with part of the fire front removed.
Figure 3 is a vertical transverse section through a rear portion of the boiler, on
the line 3-3 of Figure 1.
Figure 4 is a vertical longitudinal section of an internal furnace boiler showing
the circulating pipes in the furnace arranged in such manner as to conduct the

page_text: water from the lower rear part of the boiler and discharge it into the header or
headers communicating with a front upper part of the boiler.
Figure 5 is a front elevation of the same.
Figure 6 is a vertical transverse section on the line 6-6 of Figure 4.
Figure 7 is a view of a flange coupling for parts of the circulating pipes, to
facilitate removal of said pipes.
Figure 8 is a section of said coupling.
The numeral 1 designates the fire-box or internal furnace; 2 the bridge wall,
and 3 the boiler.
For the purpose of facilitating a rapid, steady and uniform circulation, there is
extended through the internal furnace one or more heating and circulating pipes,
designated by the numeral 4, and at the forward end each of these pipes is connected,
independently, with a header 5 supported in or upon the fire front of the boiler.
As shown in Figures 1 and 2, the header or headers 5 may communicate through
any suitable pipe connections 6 with a lower front part of the boiler water leg so as
to take up the cool water that would otherwise tend to remain under the internal
furnace without becoming properly heated.
Each heating and circulating pipe 4 is extended continuously through the
internal furnace or fire-box 1, as shown, and at its rear end.each of these pipes may
be turned upward, as shown in Figures 1 and 3 and made to discharge into either
the steam or water space of the boiler, or at or about the water line, as may be
preferred. As shown in Figures 1 and 3, the upturned rear ends of the heating
and circulating pipes 4 may be independently tapped or expanded into openings
formed in an arched plate 7 forming part of the rear water leg. Obviously, the con-
nection between the rear upper portion of the boiler and the upturned rear ends
of the pipes 4 may be made in any proper manner that is conveniently suited to the
peculiarities of the boiler construction and to the object to be attained by use of
these heating and circulating pipes.
For the purpose of facilitating removal or letting down of the pipes 4 at their
rear upturned ends, in order to facilitate access to the rear ends of the smoke flues 8
or to the tops of the internal furnace 1, for cleaning or repairing, it may be prefer-
able to form the rear upturned ends of the pipes 4 in separable parts .connected
by flange couplings 4" that are easily accessible, so that they can be disconnected
without difficulty. By this means, these upturned rear ends of the pipes 4. can he
easily disconnected and let down to afford access to the rear ends of the smoke
flues 8 or to any part of the boiler or furnace that may need repairs.
At their forward ends the heating and circulating pipes 4 are independently
expanded into openings formed in the header or headers 5 which may be supported
in recessed portions of the fire front or be suitably attached to either the inner
or outer side of said fire front, as preferred. The front of each header 5 is pro-
vided with openings that are closed by removable caps 9 located directly opposite
the ends of the several pipes 4, so that by removing any caps the pipe in line there-
with can be easily cleaned or brushed out with a suitable instrument inserted
throughout the length of the pipe. The independent connection of the several
pipes 4 with their header or headers 5, thus affords a great facility for inspecting
and cleaning these pipes. As shown in Figures 1 and 2, each header 5 may be
provided, also, with a removable cap 10 suitably located for convenience in
cleaning the header itself.
In Figures 4 and 6, there is shown an arrangement of the circulating pipes 4
wherein their rear ends are turned downward and connected with the rear lower
part of the boiler below the rear end of the internal furnace. Flange couplings 4°.
Figures 4, 6, 7 and 8, are provided to connect separable portions of the downward
turned ends of these pipes 4 so that the said pipes can be readily disconnected
and be let down or removed to give.access to any part of the boiler or furnace that
may need cleaning or repair. When the rear ends of the pipes 4.are thus turned
downward, the header or headers 5 at their forward ends will discharge through
pipe connections 11, Figures 4 and 5, into the unner front portion of the boiler.

page_text: Obviously, some of the circulating pipes 4 might be arranged, as in Figures 1
and 3, to take water from the front lower part of the boiler and carry it through
the fire to be discharged into the upper rear part of the boiler, while other pipes 4
could be arranged, as in Figures 4 and 6, to take water from the lower rear part of
the boiler and conduct it through the fire, to be discharged through suitable con-
nections into the upper front part of the boiler. By this means the water will be
lifted from the lower part of the boiler very rapidly, thereby greatly promoting the
circulation and effecting a correspondingly large economy of fuel.
When the boiler is in operation, the rapid heating of the water in the pipe or
pipes 4 will greatly facilitate the circulation throughout the entire steam generator
or boiler. The cooler water from the lower part of the boiler below the internal
furnace will be drawn upward through the heating and circulating pipe or
pipes 4 and will so be discharged at a greatly elevated temperature into the steam
or water space at the upper part of the boiler. Thus, the circulation will be made
rapid, uniform and thoroughly effective; the boiler contents will be kept in a state
of constant agitation; scale and sedimentary impurities will be thrown down into
the space below the internal furnace whence they can be readily removed; steam
will be generated rapidly and with a large economy of fuel; and the usual tendency
to accumulations of scale and sediment will be greatly lessened; while the heating
and circulating pipes are so constructed and arranged with relation to the various
boiler parts that no difficulty will be experienced in any necessary cleaning and
repairs.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. In a steam boiler having an internal furnace, the arrangement of one or more
circulating pipes extended directly and continuously-through said furnace and
communicating at one end with the lower part of the boiler below one end of the
internal furnace and discharging into the upper part of the boiler at its other end,
to promote the circulation and effect a rapid generation of steam, as described.
2. In a steam boiler having an internal furnace, the arrangement of one or more
circulating pipes extended directly and continuously through said furnace and
being in communication at one end of the boiler with the lower part of the same
and at the other end with
to lift
boiler,
upper part of
water from the lower part of the boiler at one end below the internal
furnace and discharge it into an upper part of the boiler at its other end, the
interior of said pipes being accessible for the purpose of cleaning them out and the
pipes being removable to give access to the boiler and furnace for cleaning or
repairs, as described.
an
the
yor September logo.
LOJO.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.