Year: 1899

page_text: I, CONRAD TIMMANN, of 12, Hoheluft-Chaussee, Hamburg, Germany, Furniture
Remover, do hereby declare the nature of this invention to be as follows:-
Furnaces wherein the burning of the coal occurs underneath on the grate in
order that a rational combustion may be attained, are attended with the dis-
advantage that as a result of their complicated construction, the performance
of repairs entails considerable expense and furthermore that the grate area is
barely sufficient for the production of the required amount of steam because a
large portion of the coal fed thereto does not burn.
This invention relates to a direct-fired smokeless furnace wherein the combus-
tion takes place on a grate, but which is exempt from the aforesaid disadvantages.
This smokeless furnace enables combustion to go on over the entire area of the
grate, is suitable for any boiler, precludes burning out the top of the fire-box,
is not retarded by the admission of cold air when the fire door is opened, such
air rather contributing to secure a more perfect combustion of the gases.
In the accompanying drawings Figure 1 shews in longitudinal section, the
invention as applied to an ordinary type of boiler. Figure 2 shews a cross-
section of same on the line xx, and Figure 3 a similar cross-section on the
line y-y.
For the purposes of this invention the front portion of the flue a where the
furnace is situated is formed at either side with longitudinally extending pockets b
and inwardly projecting constrictions c.
Firing-up is effected as in any ordinary furnace by lighting a fire on the
grate i situated below the centre of the fire-box. This done, coal is piled up on
the fire in such quantity that but a small space is left unoccupied at the top.
This coal is laterally supported on the constrictions c, which also serve to shut off
communication between the pockets and the space above the layer of coal. The
coals fall in a laterally slanting direction below the constrictions c (as shewn in
Figure 2) the spaces & being left free through which the burning gases pass, air
being supplied to the underside of the grate in order to maintain the combustion
of the fuel. The cold coals fed in at the top are first deprived of their gaseous
constituents by distillation whereupon the gas-free coal, i.e., coked residue, falls
on to the grate i and burns without smoke. The glowing fire underneath the
constrictions c throws out great heat, which is conducted to the rear part of the
flue through the openings f and g in the fire-bridge e above the grate, these
apertures and being the only passages through the fire-bridge, so that any
smoke that may be formed above the coal is drawn along with the air entering
at the open fire-door or through apertures in the same through the fire on the
grate and led along with the smokeless hot gases, through the apertures f and g
to the rear part of the boiler flue.
By this method of depriving the coal of its gaseous constituents more perfect

page_text: combustion is ensured than can be attained in any other kind of furnace, and
the fumes issuing from the chimney are quite free from black smoke.
The frequent attention required in other methods, in order to ascertain whether
more coal is needed, is here rendered superfluous because the stoking chamber is
quite filled with coal. The grate being an ordinary flat grate the furnace differs
from the usual types only in the modified form of the fire-box and fire-bridge.
The superiority of this furnace in point of simplicity is evident, and it can
easily be demonstrated that it ensures a perfectly smokeless combustion as it is
only a question of the form of the fire-box. This method of firing can be applied
to any type of boiler at little expense, which in view of the advantages accruing
will be quickly repaid by the economy effected in the fuel.
Dated this 23rd day of May 1899.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
I, CONRAD TIMMANN, of 12, Hoheluft-Chaussee, Hamburg, Germany, Furniture
Remover, 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:-
-
Furnaces wherein the burning of the coal occurs underneath on the grate in
order that a rational combustion may be attained, are attended with the dis-
advantage that as a result of their complicated construction, the performance
of repairs entails considerable expense and furthermore that the grate area is
barely sufficient, for the production of the required amount of steam because a
large portion of the coal fed thereto does not burn.
This invention relates to a direct-fired smokeless furnace wherein the combus-
tion takes place on a grate, but which is exempt from the aforesaid disadvantages.
This smokeless furnace enables combustion to go on over the entire area of the
grate, is suitable for any boiler, precludes burning out the top of the fire-box,
is not retarded by the admission of cold air when the fire door is opened, such
air rather contributing to secure a more perfect combustion of the gases.
In the drawing accompanying my Provisional Specification Figure 1 shews in
longitudinal section, the invention as applied to an ordinary type of boiler.
Figure 2 shews a cross-section of same on the line -, and Figure 3 a similar
cross-section on the line y-y.
For the purposes of this invention the front portion of the flue a where the
furnace is situated is formed at either side with longitudinally extending pockets b
and inwardly projecting constrictions c.
Firing-up is effected as in any ordinary furnace by lighting a fire on the
grate situated below the centre of the fire-box. This done, coal is piled up on
the fire in such quantity that but a small space is left unoccupied at the top.
This coal is laterally supported on the constrictions c, which also serve to shut off
communication between the pockets and the space above the layer of coal. The
coals fall in a laterally slanting direction below the constrictions c (as shewn in
Figure 2) the spaces being left free through which the burning gases pass, air
being supplied to the underside of the grate in order to maintain the combustion
of the fuel. The cold coals fed in at the top are first deprived of their gaseous
constituents by distillation whereupon the gas-free coal, i.e. coked residue, falls

page_text: on to the grate i and burns without smoke. The glowing fire underneath the
constrictions c throws out great heat, which is conducted to the rear part of the
flue through the openings f and g in the fire-bridge e above the grate, these
apertures f and y being the only passages through the fire-bridge, so that any
sinoke that may be formed above the coal is drawn along with the air entering
at the open fire-door or through apertures in the same through the fire on the
grate and led along with the smokeless hot gases, through the apertures f. and y
to the rear part of the boiler flue.
By this method of depriving the coal of its gaseous constituents more perfect
combustion is ensured than can be attained in any other kind of furnace, and
the fumes issuing from the chimney are quite free from black smoke.
The frequent attention required in other methods, in order to ascertain whether
more coal is needed is here rendered superfluous because the stoking chamber is
quite filled with coal. The grate being an ordinary flat grate the furnace differs
from the usual types only in the modified form of the fire-box and fire-bridge.
The superiority of this furnace in point of simplicity is evident, and it can
casily be demonstrated that it ensures a perfectly smokeless combustion as it is
only a question of the form of the fire-box. The method of firing can be applied
to any type of boiler at little expense, which in view of the advantages accruing
will be quickly repaid by the economy effected in the fuel.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
A furnace characterized by the fire-box or front end of the flue (a) being pro-
vided with longitudinally extending lateral pockets such as (b) and constrictions
such as (c) for the purpose of forming channels (d) through the pockets (b) clear
of the fuel serving as passages for the hot gases, and by the constrictions (c)
affording a lateral support for the fuel and acting to cause the hot gases to
pass through the apertures (f, g) in the fire-bridge (e) above the grate but below
the constrictions, substantially as specified.
DI 1
0711 LM 1800
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.