Improvements in or relating to Steam Boilers.
Year: 1890

page_text: Date of Application, 19th Dec., 1890
Complete Specification Left, 19th Sept., 1891-Accepted, 16th Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to Steam Boilers.
A communication from JULES BARLET, of Vitry-en-Artois, Pas de Calais, in the
Republic of France.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention to be as follows:-
:-
This invention relates to steam boilers in which steam is generated partly by
means of boiling tubes or supplemental shells or boilers and which have a removable
fire-box.
The main body of the improved boiler is connected with the boiling tubes by
four branch tubes. The upper portion of the body is surmounted by a dome at
the top of which there is a man-hole.
The cylindrical body is supported by preferably six side wings or brackets
resting upon the masonry. The removable fire-grate is arranged within the main
body in a tube or flue and is provided with a readily removable grate. Above
the grate there is a fusible plug. Under normal circumstances this plug is covered
with water.
The boilers rest upon cast supports and are internally provided with tubes and
closed by stayed tube-plates at either end. In the lower portion is provided a
free space for cleaning purposes as well as a manhole and safety-valve such as is
used in digesters. The tubes are expanded and protected against the action
of the fire by a counter-plate. The blow-off pipes arranged at the front
part of the masonry and at the lower portions of the boilers enable the discharge to
be effected without pressure. In front and behind the boiler tubes are smoke-boxes
which facilitate the circulation of the gases and afford access to the tubes and the
back part of the fire-box.
The operation is as follows:-The gases arising from combustion pass through
the first smoke-box and the boiler-tubes and enter the second smoke-box at the
opposite end. They then rise between the boilers and the main body and owing to
the arrangement of the deflecting walls or bridges heat the upper portion of the
boilers and the top of the main body whereupon they issue through the openings
provided behind the said deflecting walls and re-descend to the space below the
boilers after heating the lower portion of which they escape through the flue or
chimney.
The feed-water is admitted into the upper part of the boiler through an opening
and thence descends along the walls of the fire-box or flue by a bifurcated tube and
is discharged by the latter into the upright tubes at the front.
The object of this arrangement is to heat the water by contact with the walls of
the fire-box and to cause the impurities to be deposited in the vicinity of the
discharge cocks so that they can be readily carried away.
As the fire-box is only covered by a thin layer of water the steam submitted to
the practically direct action of the fire becomes superheated and gets rid of most
of the water it contains. Steam is derived from the dome through pipes connected
together at a sufficient height above the dome not to interfere with the easy access
to the manhole.
Dated this 10th day of December 1800
W. P. THOMPSON & BOULT,
Agents for the Applicant.

page_text: Improvements in or relating to Steam Boilers.
A. communication from JULES BARLET, of Vitry-en-Artois, Pas de Calais, in the
Republic of France.
I. ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., 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 in which steam is generated partly by
means of boiling tubes or supplemental shells or boilers and which have a removable
fire-box.
The main body A. of the improved boiler is connected with the boiling tubes by
four branch tubes D. The upper portion of the body is surmounted by a dome J
at the top of which there is a manhole.
The cylindrical body is supported by preferably six side wings or brackets U
resting upon the masonry. The removable fire-grate E is arranged within the
main body A in a tube or flue B and is provided with a readily removable grate.
Above the grate there is a fusible plug V of ordinary construction which under
normal circumstances is covered with water, but when the water-level sinks
sufficiently to expose the plug to the action of the fire the solder melts and thus
admits steam which by rushing on to the flame extinguishes it. To settle the boiler
in operation again all that is necessary is to refill the recess of the plug with solder
in the usual manner and admit a fresh-supply of water to the-boiler.
The boilers. C rest upon cast supports and are internally provided with tubes
and closed by stayed tube-plates at either end. In the lower portion is provided
a free space for cleaning-purposes as well as a manhole. The entrance is at o
where an opening is provided which under normal circumstances is closed by a
cover or door. The tubes are expanded and protected-against-the-action_of_the_
fire at their rear ends by a counter-plate C. The blow-off pipes H arranged at
the front part of the masonry and at the lower portions of the boilers enable the
discharge to be effected without pressure. In front and behind the boiler tubes
are smoke boxes F and G which facilitate the circulation of the gases and afford
access to the tubes and back part of the fire-box.
The operation is as follows:-The gases arising from combustion
pass through
the first smoke-box F and the boiler tubes and enter the second smoke-box G at
the opposite end. They then rise into the space M between the boilers C and the
main body A and pass over the walls or bridges R Q R and heat the upper portion
of the boilers C and the lower portion of the main body A whereupon they issue
through the openings provided at the rear end of the walls R Q R and descend to
the space N below the boilers C-and-after heating-the lower portion of these they
escape through the flue or chimney.
The feed water is admitted into the upper part of the boiler through the
opening X and thence descends along the walls of the fire-box or flue by a
bifurcated tube W and is discharged by the latter into the upright tubes D at the
front.
The object of this arrangement is to heat the water by contact with the walls of
the fire box and to cause the impurities to be deposited in the vicinity of the
discharge pipes H so that they can be readily carried away.
As the fire-box is only covered by a thin layer of water the steam submitted to
the practically direct action of the fire becomes superheated and gets rid of most
of the water it contains. Steam is derived from the dome J through the pipes P
connected together at a sufficient height above the dome not to interfere with the
easy access to the man-hole.

page_text: Having now particularly described and ascertained the nature of the said
invention as communicated to me by my foreign correspondents, and in what
manner the same is to be performed, I declare that what I claim is :-
An improved steam boiler wherein the boilers proper are adapted to act partly
by means of boiler-tubes and which is characterized by a removable grate or fire-
place and a fusible plug which opens whenever there is lack of water; also by the
arrangement for conducting the gases all substantially as described and shown in
the accompanying drawings.
Dated this 19th day of September 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.