Improvements in and relating to Steam Boiler and other Furnaces.
Year: 1895

page_text: Date of Application, 11th July, 1895
Complete Specification Left, 11th Apr., 1896-Accepted, 16th May, 1896
PROVISIONAL SPECIFICATION.
Improvements in and relating to Steam Boiler and other Furnaces.
I, WILLIAM KEY of 109 Hope Street, in the City and County of Glasgow,
Ventilating and Heating Engineer, do hereby declare the nature of my invention
to be as follows:-
―:
This invention has for its object to consume smoke in steam boiler and other
furnaces.
According to my improvements I form the furnace fire bars so that they shall
extend from front of furnace flue to the back flame bridge. Over these bars I fit.
a transverse fire clay small bridge or upward deflecting organ, about the part.
where the bars usually extend to, thus leaving a length of bar or perforated grid
between this deflecting bridge and the usual fire-clay flame bridge which the bars.
now extend to. Below the fire bars, preferably under the line of deflecting bridge,.
I fit in a flue a transverse partition of cast iron or malleable sheeting, and in this I fit
a door having a rod connection to front of furnace where a ratchet and pawl, rack
and pinion or equivalent device may be used so as to open or close the door to any
regulated distance. By this means in addition to the primary air admitted to.
furnace, a current of cold air will pass underneath the bars and through the
partition door, and then up between the extended ends of the bars or perforated
grid by which time it will have its temperature raised to act as a secondary current.
of heated air to meet the products of combustion passing over deflecting bridge and
thus consume the carbonaceous matter which usually forms smoke.
Dated the 10th dox of Jul 1895
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents..
COMPLETE SPECIFICATION.
Improvements in and relating to Steam Boiler and other Furnaces.
I, WILLIAM KEY, of 109 Hope Street, in the City and County of Glasgow,
Ventilating and Heating Engineer, do hereby declare the nature of my invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement in writing that is to say :-
This invention has for its object to prevent the formation of smoke in steam
boiler and other furnaces.
And in order that my said invention and the manner of performing or carrying
same into practice may be properly understood, I have hereunto appended an
explanatory sheet of drawings, in which the same reference letters are used to
denote corresponding parts in all the figures where shown.
Figure 1 is a longitudinal section, broken away, of a steam boiler showing my
improvements applied thereto; and
Figure 2 is a corresponding horizontal section taken through the furnace flue.
Figures 3, 4, and 5 are transverse sections as taken on the lines 1-1, 2-2 and.
3-3 respectively on Figure 2.
Referring to these drawings:-According to my improvements I form the furnace
fire bars a so that they shall extend from front of furnace flue A to the back flame

page_text: bridge B. Over these bars a I fit a transverse fire clay small bridge or upward
deflecting organ B₁ about the part where the bars usually extend to, thus leaving
a length of bar forming a perforated grid a' between this deflecting bridge B1 and
the usual fire clay flame bridge B which the bars now extend to. Below the fire
bars a preferably under the line of deflecting bridge B' I fit in a flue a transverse
partition C of cast iron or malleable sheeting and in this I fit a door C¹ having a
rod connection C³ to front of furnace where a pin and rack, ratchet and pawl, rack
and pinion, or equivalent device may be used at C³ so as to open or close the
door C¹ to any regulated distance. By this means in addition to the primary air
admitted to furnace, a current of cold air will pass underneath the bars a and
through the partition door C¹, and then up between the extended ends a¹ of the
bars a by which means it will have its temperature raised by contact with the bars
and so act as a secondary current of heated air to meet the furnace gases passing
over deflecting bridge B₁ and thus consume the carbonaceous matter which usually
forms smoke.
An arch of brickwork B' would preferably be formed towards the rear part of
flue A, so as to form a secondary combustion chamber between it and the flame
bridge B, for the air and combustible gases to thoroughly mix and be consumed,
and to deflect the flame towards the lower surface of the surface flue and thus
induce circulation of the water under level of the flues.
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 :-
1. In steam boiler and other furnaces the arrangement and combination of
appliances for preventing the formation of smoke, substantially as herein described
in reference to and shown in the accompanying drawings.
2. In steam boiler and other furnaces, the fitting of the firebars from the front
of flue to the back flame bridge, so that an extended perforated part is formed
between deflecting bridge and flame bridge, substantially as and for the purposes
herein described in reference to and shown in the accompanying drawings.
Dated 10th day of April 1896.
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.