Year: 1887

page_text: Date of Application, 4th Apr., 1887
Complete Left, 4th Jan., 1888
Complete Accepted, 10th Feb., 1888
We, JOSIAH BANCROFT, engineer, and WILLIAM WILD, estate agent, both of 72
Lancaster Avenue, Fennel Street, Manchester in the County of Lancaster, do hereby
declare the nature of this invention to be as follows:- C
Our invention relates to steam boiler furnaces and other furnaces and consists in
arrangements or apparatus for consuming the smoke and reducing the consumption of
fuel.
In applying our improvements to a boiler furnace we placo an exhausting fan or
equivalent apparatus in any convenient position in the boiler house, by preference
near to the chimney and upon the top of the masonry in which the boiler is set, and
drive the fan or equivalent apparatus by power. To the suction orifice of the fan we
connect a pipe or pipes extending into the inside of the chimney or the flue leading
into the chimney and above or behind the pipe or pipes we place a damper into the
chimney or flue by which the latter may. be more or less closed. The delivery pipo
from the fan we carry to the front of the boiler and divide it into two branches, one
of which we pass through the front plate or door frame of the boiler furnace above
the firing door, and the other branch we pass into the ashpit through an opening cut
at the side or bottom of the ashpit door. This second branch may terminate in the
ashpit, but by preference we carry it along the bottom of the ashpit into the fire
bridge and arrange flues or outlet passages in the fire bridge so that the gases delivered
by this branch of the pipe pass out at or near to the top of the firebridge.
The smoke and combustion gases pass from the grate through the boiler flues to the
chimney and are drawn from it or the flue leading to the chimney partly or entirely
by the fan or equivalent apparatus, which delivers them through the pipes herein
before described partly above the fire and partly either into the ashpit below the fire
bars or by preference through the firebridge. By passing through or over the fire
and mixing with the hot flame at the fire bridge, the unconsumed or imperfectly con-
sumed combustible parts of the smoke or gases, which had entered and are drawn

page_text: from the chimney, become completely consumed and the quantity of fresh air having
to be supplied through the ashpit door, which latter is provided with means of adjust-
ment, is reduced by the quantity of hot uncombined air drawn by the fan from the
chimney. In consequence the issue of smoke from the chimney is prevented and the
consumption of fuel reduced. The branch pipes are provided with valves or dampers
to regulate the quantity delivered above the fire and through the ashpit or bridge, or to
shut off one or the other delivery entirely, as may be required for obtaining the best
utilisation of the fuel or prevention of smoke.
Similar arrangements can be applied to other furnaces in which fuel is burnt upon
grates.

page_text: Furnaces.
We, JOSIAH BANCROFT, of Gee-Cross, Hyde, Cheshire, Engineer, and WILLIAM
WILD, of Gee-Cross, Hyde, Cheshire, Estate Agent, 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 :-
Our invention relates to steam boiler and other furnaces, and consists of arrangements
or apparatus for preventing or consuming the smoke, and reducing the consumption of
fuel.
In applying our improvements to a boiler furnace, we place an exhaust fan, or
equivalent apparatus, such as a worm exhauster, or steam jet exhauster, examples of
two of which are shown in the drawings, in any convenient position in the boiler
house, by preference near to the chimney and upon the top of the masonry in which
the boiler is set, and drive the fan or worm exhauster by power mechanical, or the
steam jot exhauster by means of the direct power of the steam from the boiler, or it
may be from the exhaust steam of the engine.
To the suction pipe at a, a, of the fan or other exhauster, forming equivalent
apparatus, we connect a range of piping extending into the inside of the chimney, or
the flue leading thereto, and above or behind the pipe or pipes we place a damper of
any suitable kind in the chimney or flue whereby the same inay be partially closed so
as to regulate the flow of the gases. The delivery end of the fan or other exhauster
forming equivalent apparatus, we connect at b, b, to a range of piping carried to the
front of the boiler and divided into two branches, one of which we pass through the
front plate or door frame of the boiler above the firing door, and the other branch we
pass into the ash-pit through an opening cut at the side or bottom of the ash-pit door,
or in any suitable manner adapted to the design of the boiler operated upon. This
second branch may terminate in the ash-pit, but by preference we carry it along the
bottom of the ash-pit to or behind the fire bridge, and form flues or outlet passages at
or behind the same, so that the gases delivered by this branch of the pipe shall pass
out at or near the top of the fire bridge.
The smoke or combustion gases from the grate pass through the boiler flues to the
chimney, and are drawn from it, partly or entirely, by the fan, steam, or other
equivalent exhausting apparatus, which delivers such gases through the pipes described,
partly above the fire, and partly either into the ash-pit below the fire bars, or, by
preference at or near the fire bridge.
By passing through or over the fire and mixing with the hot flame at the fire
bridge, the unconsumed or imperfectly consumed combustible parts of the smoke or
other gases, which are drawn from the chimney or flues by the fan or other
exhauster, become more perfectly consumed, and the quantity of fresh air required to
be supplied through the ash-pit or fire door for combustion purposes, is reduced by the

page_text: quantity of hot uncombined air drawn by the exhausting apparatus from the chimney or
flues, thus reducing or preventing the issue of smoke and reducing the fuel necessary.
The pipes are provided with suitable valves or dampers for regulating the flow, and
it is obvious that one branch only may be employed as a modification, or branches to
more than one flue of a boiler may be arranged.
When a steam exhauster is employed, and the same takes its power from the boiler
to which the apparatus is applied, wo provide a door or valve or damper in the range
of pipes, as at c, c, for the temporary admission of air pending the getting up of
steam, so as to prevent the issue of smoke during the time requisite for that
purpose.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed, we declare that what
we claim is-
1. The employment, in connection with steam boiler or other furnaces, of exhausters'
such as fan, screw, steam or other equivalent apparatus, in combination with a range
of piping extending from the chimney or flues to the fire place, ash-pit, or fire
bridge, or to both, for the purpose and in manner substantially as herein shown and
described.
2. In connection with steam boiler and other furnaces, the drawing by means of
exhausting apparatus, worked by power or steam direct, through pipos for the
purpose, unconsumed and other gases from the chimney or flues to the fire, ash-pit,
or fire bridge, or both, with the object and in manner substantially as herein shown
and described.
DL:
1000
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester,
Agent.