Improvements in Smokeless Furnaces.
Year: 1897

page_text: Date of Application, 16th Aug., 1897
Complete Specification Left, 9th May, 1898-Accepted, 25th June, 1898
Improvements in Smokeless Furnaces.
I, PIERRE JOACHIM BOIMARE, of 81, Rue de Provence, Paris, in the Republic of
France, Captain, do hereby declare the nature of this invention to be as follows:-
This invention relates to a device or feed chamber for fuel applicable to all
kinds of furnaces and by means of which furnaces are rendered practically smoke-
less. Fuel is initially heated and moistened in the feed chamber in such a manner
as to effect its distillation before it is fed on to the fire bars in the furnace.
According to my invention a box or charging chamber is arranged in front of
and above the fire-bars of the furnace, the said box being closed at its front end
At the bottom of this box or chamber
by two doors placed one above the other.
and behind the lower door there is arranged a removable cast block which is
formed with a central hole for the entrance of air and for the passage of a poker.
This hole is continued through the lower door.
The coal is introduced through the upper door and rests upon the bottom of the
box behind the block. It is subjected to a gradually increasing temperature by
contact with the hot gases from the furnace. The coal is stirred up as its
temperature rises by means of a stoking bar which is passed through the hole in
the block. Distillation takes place and the gases disengaged are burnt on their
passage above the furnace. The distillation is facilitated by sprinkling the coal
with water fed through a tube having a rose arranged inside the box. A cock
regulates the flow of water which is preferably taken from the boiler feed pipe.
When the distillation is deemed sufficient, the fuel is pushed with a rake upon
the fire-bars of the furnace, this operation being easily effected through the upper
door which is fully opened for the purpose.
With my arrangement the maximum efficiency is obtained from the burnt fuel
and the furnace is rendered quite smokeless.
Dated this 16th day of August 1897.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Smokeless Furnaces.
I, PIERRE JOACHIM BOIMARE, of 81, Rue de Provence, Paris, in the Republic of
France, Captain, 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 a device or feed chamber for fuel applicable to all

page_text: kinds of furnaces and by means of which furnaces are rendered practically smoke-
less. The fuel is initially heated and moistened in the feed chamber in such a
manner as to effect its distillation before it is fed on to the fire bars in the furnace.
In the accompanying drawing,—
Figure 1 is a front view illustrating the application of my feed chamber to an
ordinary steam boiler; and
Figure 2 is a section on the line 1-2 Figure 1.
A box or charging chamber a is arranged in front of and above the fire-bars g
of the furnace, the said box a being closed at its front end by two doors b and c
placed one above the other. At the bottom of this box or chamber a, and behind
the lower door c, there is arranged a removable cast block d which is formed with
a central hole o for the entrance of air and for the passage of a poker. This hole
extends through the lower door c.
The coal is introduced through the upper door b and rests upon the bottom of
the box a behind the block d. It is subjected to a gradually increasing tem-
perature by contact with the hot gases from the furnace and it is stirred up as its
temperature rises by means of a stoking bar which is passed through the hole o
in the block d. Distillation takes place and the gases disengaged are burnt on
their passage above the furnace. The distillation is facilitated by sprinkling the
coal with water fed through a tube f having a rose fl arranged inside the box a.
A cock regulates the flow of water, which is preferably taken from the boiler
feed pipe.
When the distillation is deemed sufficient, the fuel is pushed with a rake upon
the fire-bars g of the furnace, this operation being easily effected through the
upper door 6 which is fully opened for the purpose.
With my arrangement the maximum efficiency is obtained from the burnt fuel
and the furnace is rendered quite smokeless.
It will be obvious that the size and shape of the feed box or charging chamber
can be adapted to all kinds of furnaces.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A feed box or charging chamber for furnaces wherein the fuel is preliminarily
heated and moistened so that it is distilled before being fed on to the fire bars of
the furnace thereby rendering the furnace smokeless, substantially as herein-
before described.
2. A feed box or chamber of the kind described in the preceding claiming clause,
comprising a box a placed in front of and above the furnace and closed at its
front part by two doors b and c arranged one above the other and serving for the
introduction of the fuel which drops upon the bottom of the box a, the door c
having a cast block against its inner face which block is formed with a hole
for permitting the entrance of air and the introduction of a stoking bar or a rake
substantially as hereinbefore described and illustrated.
3. The combination with a feed box or chamber for furnaces of all kinds, of a
feed water device the delivery of which can be regulated and which is provided
with a rose for continuously or intermittently spraying pulverized or finely divided
water upon the fuel in the feed box, substantially as hereinbefore described.
G. F. REDFERN & Co..
4, South Street, Finsbury, London, Agents for the Applicant.