Improved Smoke-preventing Apparatus for Steam-boiler Furnaces and similar Furnaces.
Year: 1890

page_text: Date of Application, 17th Oct., 1890-Accepted, 22nd Nov., 1890
Improved Smoke-preventing Apparatus for Steam-boiler Furnaces
and similar Furnaces.
I, DAVID BRIDGE, of 3 Adelphi Street, Salford in the County of Lancaster,
Foreman Engineer, 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 :-
My invention relates to apparatus for preventing the production of smoke in
steam boiler furnaces and similar furnaces and consists in an improved arrangement
of said apparatus.
On the sheet of drawings appended hereunto my improved apparatus is shewn
applied to a Lancashire boiler, Fig. 1 showing a front view of the boiler and Fig. 2 a
longitudinal section of the same with my apparatus applied thereto.
The apparatus consists of a fan a or equivalent blower or blowing engine, which
may be placed on the top of the brickwork of the flues as shewn or in any other part
of the boiler house or adjacent premises and which is driven in the ordinary way.
The blast pipe of the fan is connected to a pipe b, which is introduced into one of
the boiler flues at the back end of the boiler and extends to the front as shown on the
drawings, or may pass into the flue at the front end and be returned again to the
front. At the front end the pipe is connected by a Tee pipe c or its equivalent to
two pipes dd extending to the sides of the boiler and rising up in front of the same.
From the upright parts of each of these pipes two pipes ƒ ƒ and g gl branch off.
The lower pipes and g are turned by means of elbows into the ashpit in the flues
underneath the grate and carried through the fire-bridge and rise up behind it to
nearly the top and to the middle of the same and are then turned towards the back
and are open at the end. The upper pipes g and g' are fitted with elbows or bent and
passed through the door frames m into the flues above the grate bars, projecting a
short distance only into the flue and preferably deflected a little. The ends of the
pipes in the flues may be fitted with nozzles for spreading the blast, or be flattened
for this purpose. The different branches leading to the pipes ff¹g and gl are fitted
with cocks or their equivalents for regulating the quantity of air passing through the
same.
I
The air blown by the fan into the pipe in passing through the same becomes
thoroughly heated by the heat in the boiler flue and issuing from the pipes g and g¹
is blown upon the top of the fuel and mixes with the gases rising from the same and
promotes combustion, which is further assured by the second supply of hot air issuing
from the pipes and f¹ behind the bridge and the production of smoke is thereby
effectually prevented.
When applied to a range of boilers, the fan or its equivalent is preferably connected
to a blast pipe from which a pipe b for each boiler branches off, or the blast may be
heated in a pipe or pipes in the flue of one of the boilers and a pipe connected to
these extending in front of the range of boilers, from which the vertical pipes at the
sides of each boiler rise up. The arrangement of heating and connecting pipes may
obviously be modified to suit different kinds of boilers and localities.
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:
In combination with a steam boiler furnace or similar furnace the arrangement of
two blast pipes or nozzles, one blowing upon the fuel or into the space above the
grate and the other into the flue behind the fire-bridge, and connected to a fan or

page_text: equivalent blowing machine by means of pipes which partly pass through one or
several of the boiler-flues, substantially as hereinbefore described and illustrated and
for the purpose set forth.
Dated this 13th day of October 1890
W. T. EMMOTT,
Agent for the Applicant.