Improvement in Flue Boilers.
Year: 1891

page_text: Date of Application, 21st May, 1891
Complete Specification Left, 9th Jan., 1892-Accepted, 13th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvement in Flue Boilers.
I, HERMANN RINNE, of Essen on the Ruhr, Prussia, Engineer, do hereby declare
the nature of this invention to be as follows:-
My invention relates to flue boilers with inside furnace, and its object is to create
a more perfect combustion of the fuel so as to attain a better utilization of the same
and to prevent the formation of smoke.
For this purpose I construct behind the grate or the fire-bridge of the furnace, a
horizontal or inclined wall of fireproof material, from each end whereof an upright
wall extends respectively to the top and the bottom of the flue, and in the former I
arrange vertical or nearly vertical slits or apertures for the passage of the flames
and products of combustion.
Moreover, I dispose lengthwise within the flue, a channel or pipe communicating
at one end with the outer air and at the other end with the ash-pit of the furnace,.
so that, if the door of the ash-pit is kept closed, the air for supporting combustion
will pass through the said channel or pipe and become heated therein.
Dated the 21st day of May 1801
HASELTINE, LAKE & Co.,
45,. Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvement in Flue Boilers.
I, HERMANN RINNE, of Essen on the Ruhr, Prussia, Engineer, do hereby declare
the nature of this invention and in what manner the same is to be performed, to he
particularly described and ascertained in and by the following statement:-
My invention relates to flue boilers with inside furnace, and its object is to create
a more perfect combustion of the fuel so as to attain a better utilization of the same
and to prevent the formation of smoke.
For this purpose I construct behind the grate or the fire-bridge of the furnace, a
horizontal or inclined wall of fireproof material, from each end whereof an upright
wall extends respectively to the top and the bottom of the flue, and in the former I
arrange vertical or nearly vertical slits or apertures for the passage of the flames
and products of combustion.
Moreover, dispose, lengthwise within the flue, a channel or pipe communicating
at one end with the outer air and at the other end with the ash-pit of the furnace,
so that, if the door of the ash-pit is kept closed, the air for supporting combustion
will pass through the said channel or pipe and become heated therein, whereby the
temperature of combustion is raised.
In the annexed drawing
Fig. 1 is a longitudinal section and Fig. 2 a transverse section on line xy, Fig. 1,
of a boiler provided with my improvement.
Fig. 3 shows a modification of the invention.
In these figures a is the furnace, the fire-bridge and the flue. Behind the
fire-bridge and about in the middle of the height of the flue is constructed of fire-
proof material the wall i, inclined upward from the front to the rear and having the
slits or apertures s. At its forward end the wall i is joined to the bottom of the flue
by the vertical wall 9, while at its back end it is joined to the top of the flue by the

page_text: vertical wall. Between the wall g and the fire-bridge is left a space k for the
collection of ashes carried over from the furnace.
With this arrangement the products of combustion emanating from the furnace,
have to pass through the apertures s, in consequence whereof the incompletely
consumed particles of the fuel contained in the said products, are brought in contact
with the highly-heated surfaces of the wall and the apertures and caused to be
burnt fully, so that a more perfect consumption of the fuel and prevention of smoke
than heretofore attainable is brought about. On account of the apertures s being
vertical they are not liable to be choked by ashes.
It will readily be perceived that the wall i may also be horizontal, or slightly
inclined downward from the front to the rear, or of other form than shown in the
drawing. It may also be joined at its ends directly to the bottom and the top of
the flue, the vertical walls and practically disappearing under these conditions.
For heating the air to be supplied to the furnace in view of raising the temperature
of combustion, there is arranged at the bottom of the flue the air-channel m,
extending from the ash-pit c, closed by the door t, along the whole flue and out
through the back wall of the brick-work of the boiler. The said channel mmay,
however, also be brought otherwise in communication with the atmospheric air, for
instance by means of another channel placed in the bottom flue e and connected to
the rear end of channel m.
Fig. 3 represents a modified disposition in which the wall i directly joins the fire-
bridge b. Moreover there is shown in this figure an air-pipe communicating with
a slit at the rear end of the wall and serving to conduct air to the products of
combustion after their having passed the apertures i. This pipe is of particular
advantage with fuel apt to produce much smoke. Preferably the same is provided
with a regulating valve (not shown in the drawing) which is opened widest when
fresh fuel thrown on the grate.
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:
1. In a flue boiler with inside furnace, the construction, within the said flue and
behind the furnace, of a horizontal or inclined wall of fire-proof material joined at
its fore end to the bottom and at its rear end to the top of the fluc, either directly
or by means of vertical walls, and having vertical or nearly vertical slits or apertures
for the passage of the products of combustion, substantially as described.
2. In a flue boiler with inside furnace provided with the wall specified in
Claim 1, the construction of an air-channel in passing lengthwise through the flue
and whereby atmospheric air is conducted to the ash-pit of the furnace, which is
fitted with a door for closing the same, substantially as described.
Dated the 9th day of January 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.