Year: 1886

page_text: Date of Application, 22nd Sept., 1886
Complete Left, 22nd June, 1887.
Complete Accepted, 22nd July, 1887.
RESERV
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature of
this invention to be as follows :-
This invention relates to means for improving the draught of steam-boiler and other
furnaces.
In furnaces having a grate, and especially in those furnaces where the length of
grate is considerable, the combustion is much more active at points situated near the
loor of the furnace than at the parts of the grate which are at a distance therefrom.
At the rear part of the furnace, and especially at the portion situated in proximity to
the bridge, the combustion is always slow and incomplete, and in some cases the
draught is hardly noticeable. The fuel which is placed at this part of the grate is
thus, generally, much less utilized than that which is spread over the front part of the
grate. The result of this is that a considerable portion of the useful effect of the fuel
is wasted, which defect it is very important to obviate.
In order to render the combustion as active and complete at the rear part of the
furnace as it is at the front part I employ a series of conduits or pipes, in the ash pit
for directing air below different points of the rear part of the grate, and distributing
it there in a suitable manner, for supporting the combustion of the fuel. In this
manner a proportion of the air, the greatest portion of which in the arrangement of
ordinary furnaces traverses the grate at points near the door of the furnace, is
conducted to parts of the grate at points comparatively distant from the furnace door
or situated near the fire-bridge, where it renders the combustion extremely active and
energetic.
By way of example 1 will describe the application of the described system to a
boiler having an internal furnace.

page_text: In the ash box are arranged in a substantially horizontal position say two rows of
superposed tubes. These tubes are open at the two extremities and at one end
communicate with the external atmosphere while the other ends extend to various
points below parts of the grate which are more or less distant from the furnace door.
and at which parts the draught would be less active than desirable without the adoption
of this special arrangement.
In order that the air shall be suitably distributed, the tubes of the lower row are
longer than those composing the upper row, and the length of the tubes of the same
row varies.
It is to be understood that the rows of tubes described can be of any shape what-
ever and arranged in any manner, and that the said tubes can be movable or fixed to
the walls of the ash box.
By improving the draught as hereinbefore described I not only obtain a more
perfect combustion than heretofore and thus effect a great saving of fuel, but I also
obtain other very important advantages among which are the following:-The smoke
is better consumed than heretofore; lower chimneys than heretofore can be used; the
temperature in the chambers of marine boilers is reduced; and the life of the grate
bars is increased.
Dated thin ɔɔnd day of Sentember 18SE
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements relating to Means for Promoting Combustion in
Boiler and other Furnaces.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings in the County of Middlesex, 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 means for improving the draught of steam boiler and other
furnaces.
In furnaces having a grate, and especially in those furnaces where the length of
grate is considerable, the combustion is much more active at points situated near the
door of the furnace than at the parts of the grate which are at a distance therefrom.
At the rear part of the furnace, and especially at the portion situated in proximity to
the bridge, the combustion is always slow and incomplete and in some cases the
draught is hardly noticeable. The fuel. which is placed at this part of the grate is
thus generally much less utilized than that which is spread over the front part of the
grate. The result of this is, that a considerable portion of the useful effect of the fuel
is wasted which defect it is very important to obviate.
In order to render the combustion as active and complete at the rear part of the
furnace as it is at the front part, I employ a series of conduits or pipes, in the ash pit
for directing air below different points of the rear part of the grate, and distributing
it there in a suitable manner, for supporting the combustion of the fuel.
In this manner a proportion of the air the greater portion of which in the arrange-
ment of ordinary furnaces traverses the grate at points near the door of the furnace ;
conducted to parts of the grate at points comparatively distant from the furnace
door or situated near the fire bridge, where it renders the combustion extremely active
and energetic.
In the accompanying drawing I have represented by way of example the
application of the present invention to a boiler having an internal furnace.
drawing
Figure is an external view showing the front of the furnace.
Figure 2 is a vertical section and
Figure 3 is a horizontal section of the said furnace.
In this
In the ash pit are arranged in a substantially horizontal position say two rows of
superposed tubes a. These tubes are open at the two extremities and at one end
communicate with the external atmosphere while the other ends extend to various
points below parts of the grate which are more or less distant from the furnace door,
and at which parts the draught would be less active than desirable without the adoption
of this special arrangement.
In order that the air is suitably distributed, the tubes of the lower row are longer
than those composing the upper row, and the lengths of the tubes of the same

page_text: It is to be understood that the rows of tubes described can be of any shape whatever
and arranged in any manner and that the said tubes can be movable, or fixed to the
walls of the ash box.
By improving the draught as hereinbefore described I not only obtain a more
perfect combustion than heretofore and thus effect a great saving of fuel, but I also
obtain other very important advantages among which are the following.
The smoke is better consumed than heretofore, lower chimneys than heretofore can
be used; the reduction of the temperature in the chambers of marine boilers is reduced
and the life of grate bars is increased.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed as communicated to me by my
foreign correspondent I declare that what I claim is.
The employment in the ash box or receptacle of a steam boiler or other furnace
having grate bars, of one or a number of conduits or tubes open at the two extremities
and extending from the external atmosphere to different points beneath the grate in
such a manner that a portion of the air for supporting the combustion which passes
through the said conduit or conduits and is directed to the rear part of the grate for
the purpose specified.
Dated this 22nd day of June 1987
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.