Improvements in Boiler Furnaces."
Year: 1897

page_text: Date of Application, 20th Nov., 1897-Accepted, 24th Dec., 1897
Defensa, Buenos Ayres, Argentine Repubиc.]
"Improvements in Boiler Furnaces."
I, THOMAS FORRESTER AGAR, of the Firm of Agar, Cross & Company, of 7
Royal Bank Place, in the City of Glasgow, Foreign Merchants, do hereby declare
the nature of this invention and in what manner the same is to be performed,
as communicated to me, to be particularly described and ascertained in and by the
following statement:-
This Invention has for its object to better adapt boiler furnaces for burning
straw or other similar light material which is apt to be carried forward by the
draft before completion of the combustion and obstruct the orifices of the tubes.
To prevent the straw being carried forward on to the tubes I employ two baffle-
plates placed vertically in the fire-box near the tube plate. The one nearest the
fire-door has its lower edge resting against or on a ledge or snelf which I fix to
the tube plate immediately below the lowest row of tubes. The flame passes over
the first and under the second baffle-plate on its way to the tubes.
My Invention is illustrated by the accompanying drawings in which Fig. 1 is
a part longitudinal vertical section and Fig. 2 a transverse vertical section of a
boiler furnace showing the arrangement of the vertical hanging baffle plates in
combination with a ledge or shelf fixed to the tube plate, which ledge keeps the
first baffle-plate in a vertical position and at a suitable distance from the tube
plate. Fig. 3 is a. part longitudinal vertical section of a boiler furnace and Fig. 4
a transverse section of the same showing the first baffle plate resting in a groove
of the ledge or shelf and the top part of the plate held between two studs screwed
into the side of the fire-box instead of hanging from the crown of the fire-box
as shown in Figs. 1 and 2.
To prevent the obstruction, by the straw, of the tubes N, I employ two baffle-
plates in the fire-box M. The first plate A nearest the fire-door K is suspended
from the crown of the furnace by the hinges B in such a manner that the lower
edge of the plate presses against a ledge or shelf D. The second baffle-plate C
is also hung from the crown of the furnace by the hooks B¹ between the first
baffle-plate A and the tube plate S. The ledge or shelf D is composed of separate
The object
pieces of cast iron or other suitable support fixed to the tube plate S.
of the ledge D is to keep the first baffle-plate A in a vertical position at a convenient
distance from the lower tubes N and to close the passage of the flame by the lower
edge of the first baffle-plate A.
In Figs. 3 and 4 the first baffle-plate A¹ is shown resting in a groove of the
ledge D and is held at the top edge by the studs H, H, instead of being suspended
from the crown of the furnace as shown in Figs. 1 and 2. This arrangement
leaves the baffle-plate A¹ free to expand in every direction and maintains it
straight.
The space or chamber formed by the first baffle-plate A¹, the ledge D¹ and the
tube plate S may be cleaned by the steam jet apparatus P.

page_text: 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:
-
1. In a boiler furnace the combination of the baffle-plate A and the ledge D
for maintaining the baffle-plate in a vertical position at a suitable distance from
the tube plate S substantially as described with reference to Figs. 1 and 2 of the
annexed drawings.
2. In a boiler furnace the combination of the baffle-plate A¹ and the ledge D¹
having a groove for supporting and maintaining straight the baffle-plate at a
suitable distance from the tube plate S substantially as described with reference
to Figs. 3 and 4 of the annexed drawings.
This 10th
f Nahan
1007
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62 Saint Vincent Street, Glasgow. Agent for the Applicant.