IMPROVEMENTS IN STEAM-BOILERS
Year: 1883

page_text: LETTERS PATENT to Friedrich Hermann Felix Engel Civil Engineer and
Patent Agent in the city of Hamburg, Germany, for an Invention of
"IMPROVEMENTS IN STEAM-BOILERS" A communication to me by Adolphe
Donneley of Hamburg in the German Empire
PROVISIONAL SPECIFICATION left by the said Friedrich Hermann Felix
Engel at the Office of the Commissioners of Patents on the 24th September
1883.
FRIEDRICH HERMANN FELIX ENGEL Civil Engineer and Patent Agent in the
City of Hamburg Germany. "IMPROVEMENTS IN STEAM BOILERS."-a commu-
nication to me by Adolphe Donneley of Hamburg in the German Empire
This invention relates to certain Improvements in Steam Boilers the object being
to improve the process of combustion of fuel and to increase the generation of
Steam in Steam Boilers and relates to the construction of the Fire place and to
appliances connected therewith.
The fire place arranged outside in front of the boiler-or within the front part of
the boiler is composed of two or more rows of upright tubes the top and bottom
ends of which are either in direct, communication with the water of the steam
boiler, or communicate to this water by intermediate pipes or channels partly
connecting the upper and partly the lower ends of the upright tubes. The tubes
of each row, have a free space left between each other, to allow of a free passage of
atmospheric air, whilst the rows themselves are preferably arranged in an inclined
position towards each other forming a tapering enclosed space towards the bottom.
The fuel is brought from the top into the space composed by the tubes and is
burned from below and the beating gases passing through the open spaces between
the binder row or rows of tubes are guided into the flues or fire tubes of the boiler
according to the construction of the latter and finally removed through the
chimney.
There is no grate required with this improved construction of fire places, as the
fire burns without such in the basket formed by the upright tubes, through the

page_text: open space between the tubes of the front row of which plenty of atmospheric air
can be admitted to the fire-The fresh air by passing through the space between
the heated tubes of the front row, warmed before it comes in contact with the fuel
and thus an almost complete combustion of smoke is attained.
In consequence of the arrangement according to which the tubes with both their
ends are put in communication with the water of the boiler, a circulation of the
latter is produced which largely improves the generation of steam whilst at the
same time the circulation of the water cools the tubes sufficiently to protect these
from being damaged by the fire.
The regulation of the fire burning in the tube basket can be effected by closing
more or less the free space between the tubes of the front row,-The admittance of
fresh air is consequently reduced accordingly-The closing of the open spaces
between the tubes, partly, as well as fully, can be executed by iron bars arranged
in rows, hinged together, which rows will also by a lever or other suitable
arrangement be lifted or lowered partly or fully.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Friedrich Hermann Felix Engel in the Patent Office on the
24th March 1884.
"
FRIEDRICH HERMANN FELIX ENGEL Civil Engineer and Patent Agent in the
city of Hamburg Germany IMPROVEMENTS IN STEAM-BOILERS A communication
to me by Adolphe Donneley of Hamburg in the German Empire
This invention relates to certain improvements in steam boilers the object being
to improve the process of combustion of fuel and to increase the generation of
steam in steam boilers and heating of water in other boilers, and relates to the
construction of the furnace in fire place and to appliances connected therewith.
This improved furnace may either be arranged outside in front of the boiler, or
inside of the front part of the boiler and is composed of two or more rows of
upright tubes, the top and bottom ends of which are either in direct communication
with the water of the boiler or communicate to same by intermediate pipes or
channels partly connecting the upper and partly the lower ends of the upright
tubes.
The upright furnace tubes are arranged in a manner to form an upright basket
for reception of the fuel, the tubes of each row leave sufficient free space between
each other to allow free passage of atmospheric air.
The fuel is fed from the
upper end into the basket and is burned from below and the heating gases passing
through the open spaces between the hinder row or rows of tubes are led into the
flues or fire tubes of the boiler and finally removed through the chimney.
The front row of tubes may be replaced by a row of upright grates or bars, or by
a perforated wall,
The regulation of the fire burning in the basket can be effected by closing more
or less the free space between the tubes of the front row or between the grates
or bars aforesaid and by consequently reducing the admission of fresh air.
The invention is illustrated by the accompanying drawings.
Figs 1, 2 and 3 are respectively front view, side elevation in section, and ground
plan showing the front end of a horizontal boiler in combination with the improved
furnace.
a and b are the rows of upright tubes forming a basket into which the fuel is fed
from the top through a hopper T. H is a channel bringing into communication
the lower ends of the both rows of tubes and forming at same time the base of the
basket. The upper ends of the tube rows communicate through channels p with
each other. The channels p are in connection with a higher level of the water of
the boiler and channel H is by branch m in connection with the bottom part of the
boiler. The water consequently circulates through the tubes of the basket whilst
the fire is burning. The sides of the tube basket are closed by upright walls
furnished with doors k for cleaning the basket, for removing ash and refuse. The
heating gases pass in direction of the arrows into the fire tube G of the boiler and
from thence through the flues as usually.
Figs 4 and 5 are respectively side elevation and ground plan in section of an
upright boiler in which the hinder row of tubes, b do not project from the boiler
but form part of the boiler itself. The same letters designate same parts as in the
before described construction. The hopper is not shown in this drawing but it will
be understood from the drawing that the coals are likewise fed into the basket from
the open top as in Fig 2.
Fig 6 represents a third construction of a boiler in combination with the
invention.

page_text: Fig 7 shows a tube boiler in combination with the improved furnace and will
likewise be understood without further description with reference to the drawings.
Figs 8, 9 and 10 illustrate a construction for connecting the tube ends with the
The ends of the tubes are formed
corresponding communicating channels.
conically and fit into borings of the channels and screw bolts are passed through
the tubes and channels to connect the corresponding upper and lower channels
firmly.
Figs 11, 12 and 13 are respectively side-elevation in section, front view and
ground plan in section illustrating an arrangement for regulating the fire by means
of grates or bars d, hinged together in several rows (three rows are shown in the
drawing) above each other of which rows one or two or more of them can be placed
against the front row of tubes of the basket, closing consequently more and more
the open parts between the tubes and reducing the admittance and draft of air.
Fig 14 shows a construction of the furnace basket in which the front row of
tubes is replaced by a row of massive bars a¹. The construction is otherwise the
'same as with the boilers before described and shown in the drawings.
Figs 15, 16 and 17 show a modification of the shape of the basket, by arranging
the tubes of each row in form of an angle. The object of this modification is to
enlarge the number of tubes and also to make the cleaning doors k accessible from
the front of the basket which may be of use in cases when there is little space at
the sides of the basket.
Having now described the nature and given particulars whereby the invention
may be carried into practical effect I claim:
Firstly. The construction of the furnace of boilers of rows of upright tubes
communicating with the water of the boiler at their top and bottom ends, the tubes
forming an upright basket open at the top for reception of the fuel as herein
described in reference to and shown by the drawings.
Secondly. The modification of forming the upright basket out of one row of
tubes at its hinder end, communicating at top and bottom with the water of the
boiler and out of one row of bars or a perforated wall in front as described in
reference to and shown by Fig 14 of the drawings.
Thirdly. The, combination of an upright furnace basket as claimed in heads
Firstly and Secondly with a regulating device for closing more or less the free
space in the front row of tubes or bars as described in reference to and shown by
Figs 11, 12 and 13 of the drawings.
In Witness whereof I the said Fridrich [sic] Hermann Felix Engel have hereunto
set my hand and seal this twenty first day of March in the year of our Lord one
thousand eight hundred and eighty-four.
FHF ENGEL