Improved Apparatus for the Prevention of Smoke in Furnaces.
Year: 1889

page_text: Date of Application, 15th Oct. 1889
Complete Specification Left, 4th Jan., 1890-Accepted, 8th Feb., 1890
PROVISIONAL SPECIFICATION.
Improved Apparatus for the Prevention of Smoke in Furnaces.
I WILLIAM DENHAM GRIMSHAW of 57 George Street Manchester in the county
of Lancaster Calico printer do hereby declare the nature of this invention to be as
follows:-
This invention relates to improved apparatus for improving the combustion of fuel
and preventing the formation of smoke in steam boiler and other furnaces, whether
fired by hand or by mechanical means.
For the purposes of my invention I fix inside the flue of the furnace two or more
pipes about two inches diameter (more or less) placed by preference about midway
between the level of the fire bars, and the crown of the furnace so as to be above
the fuel.
These pipes run parallel to the fire bars being open at the front above or at the
side of the fire doors, and closed at the rear, terminating some distance in front of
the bridge.
The portion of the pipes beyond the dead plate and above the fire bars is drilled
or perforated with a number of holes and air from the front of the furnace is driven
through the same by a forced draught either by means of steam jets inside the pipes
or by a fan or otherwise.
This forced current or currents of air in a finely divided state will mingle with
the products of combustion as soon as they are evolved from the fuel and will cause
the complete consumption thereof before arriving at the bridge without in any way
reducing the temperature and thus not only will the combustion of the fuel be
more complete and economical but the effective heat evolved will be increased and the
formation of smoke prevented.
GEORGE DAVIES.
4, St. Ann's Square, Manchester, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improved Apparatus for the Prevention of Smoke in Furnaces.
I WILLIAM DENHAM GRIMSHAW of 57 George Street Manchester in the County
of Lancaster Calico Printer, 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 improved apparatus for improving the combustion of fuel
and preventing the formation of smoke in steam boiler and other furnaces, whether
fired by hand or by mechanical means.
For the purposes of my invention I fix inside the flue of the furnace two or more
pipes about two inches diameter (more or less) placed by preference about midway
between the level of the fire bars, and the crown of the furnace so as to be above the
fuel.
These pipes run parallel to the fire bars being open at the front above or at the
side of the fire doors and closed at the rear, terminating some distance in front of
the bridge.
The portion of the pipes beyond the dead plate and above the fire bars is drilled
or perforated with a number of holes and air from the front of the furnace is driven
through the same by a forced draught either by means of steam jets inside the pipes
or by a fan or otherwise.

page_text: This forced current or currents of air in a finely divided state will mingle with
the products of combustion as soon as they are evolved from the fuel and will cause
the complete comsumption thereof before arriving at the bridge without in any way
reducing the temperature and thus not only will the combustion of the fuel be more
complete and economical but the effective heat evolved will be increased and the
formation of smoke prevented.
In order that my invention may be better understood, I will now make
reference to the accompanying sheet of drawings illustrative thereof, wherein Fig. 1
is an elevation and Fig. 2 a longitudinal section of an ordinary form of fluid steam
boiler, composed of an outer shell A, and having one or two flues a. The fire bars
are shown at c and at a position about midway between the fire bars and the crown
of the boiler, I place horizontal perforated pipes b, one arranged at each side of
the flue as shewn at Fig. 3. This horizontal perforated pipe does not extend to the
bridge e of the furnace, but terminates some little distance in front thereof, as shewn
in diagram Fig 2. It will be observed that the perforations g in the said pipes b
do not commence close to the door of the furnace, but some little distance on;
preferably that portion of the pipes over the dead plate fare without perforations.
The rear ends of the horizontal perforated pipes are closed as shewn in Fig. 2
but the front ends of the said pipes, which project outside the furnace are opened for
the reception of a smaller pipe h through which passes a jet of steam from the steam
boiler; or a current of air generated by a fan may be forced through the small
pipe so that the current or currents of steam or air in a finely divided state will
be forced through the perforations in the perforated pipes and immediately mingle
with the products of combustion, causing the complete consumption of the smoke
evolved from the fuel before arriving at the bridge e, and without in any way
reducing the temperature or draught of the furnace, whereby not only will the
combustion of the fuel be more complete and economical, but the effective heat
evolved therefrom will be increased and the formation of smoke prevented.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is: :-
The improved apparatus for the prevention of smoke in furnaces consisting of
perforated pipes, terminating at a suitable distance in front of the bridge, in
combination with steam or air jets for creating a forced draught or current, all
constructed and applied substantially as hereinbefore described and illustrated by the
drawings annexed.
Dated this 3rd day of Jenner 1800