Year: 1887

page_text: Date of Application, 8th Feb., 1887.
Specification Accepted, 8th Mar., 1887.
I WILLIAM BEGG of 8 Olive Terrace Sale in the County of Chester 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:-
This invention relates principally to the construction of the furnaces of stationary
and other steam engines, the object being to admit to the furnace the requisite amount
of atmospheric air to effect the consumption of the whole of the smoke without lowering
the temperature in the furnace or flues.
It is also applicable to other kinds of furnaces where it is desirable to consume, or
prevent the formation of, smoke.
In order that my invention may be clearly understood I have annexed hereto a sheet
of drawings illustrative thereof, in which Fig. 1. is a longitudinal section of a furnace
constructed according to my invention. Fig. 2 is a transverse sectional view (looking
outward to the door) taken through the line A-B on Fig. 1. and Fig. 3. is a similar
view (looking inward towards the bridge) taken through the line (D) on Fig. 1.
I use hollow fire bars which I make in two lengths a, a, a¹, a¹ which are open at
both ends. The inner ends are supported by a transverse bearer b, b about the centre
of the furnace.
Air is admitted into these fire bars a', a' at this part from the ash pit through the
open bottom of the bearer b, b. The "dead plate" c, c is made hollow in the form of a
box and the front ends of the front set of fire bars u, a are let into this box c, e so as
to introduce heated air therein which passes out into the furnace by means of two tubes
or passages d, d (one at each side of the furnace) which are raised up and curved
backwards so as to deliver the heated air above the fuel at the fire door end.
The rear ends of the back set of fire bars a¹, a¹ are let into a chamber e, e beneath a
perforated fire clay bridge, by which means a further supply of heated air is
admitted at the back end of the furnace also. This chambér e, e is closed at the back
by a plate g, g or by a brick wall and at the bottom by a door h, h which can be opened
at any time to remove the ashes.

page_text: Thus it will be evident that by my improved construction the air enters the hollow
fire bars a, a, a, al at about the centre and is discharged in a heated state simul-
taneously at both ends of the furnace, by which means all the smoke and combustible
gasses will be consumed and no cold air will be admitted, excepting what is allowed
to enter through the fire-door i, i just at the moment of firing-up.
In order to improve the draught in cases where it is insufficient I arrange steam
pipes, k passing through the hollow dead plate c, c into the two air admission tubes d, d
before named and terminated near the mouths of these tubes by suitable nozzles k¹, k¹.
The steam admitted by these nozzles k¹, increases or accelerates the current of air
admitted by the tubes d, d.
Steam pipes 1, I also pass into a transverse pipe m or chest placed in the hollow bearer
and provided with two series or rows of jets or nozzles n, n' for admitting steam
into both the sets of hollow fire bars a, a'. The steam from these jets or nozzles n, n²,
has the effect of preventing the said bars a, a from being burnt away and at the
same time increasing the inrush of air into the said bars a, a¹ and into the furnace
and thereby improving the draught.
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
First. The combination of two sets of hollow fire bars open at each end, and each
admitting air from the ash pit at their inner ends (where they join); the front set of
bars delivering the heated air into a hollow dead plate whence it is distributed over
the front of the furnace, and the rear set delivering the heated air into a chamber
beneath a perforated fire bridge whereby it is distributed at the rear end of the furnace
substantially as and for the purposes described and illustrated.
Secondly. The combination (in a furnace with two sets of hollow fire bars open at each
end) of steam jets to increase the draught through the said bars and to prevent them from
being burnt through, the mingled steam and heated air being distributed simultaneously
into both ends of the furnace substantially as hereinbefore described and illustrated by
the drawings annexed.
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.