IMPROVEMENTS IN THE CONSTRUCTION OF FURNACES USED IN THE RAISING OF STEAM and in what
Year: 1884

page_text: I MAURICE SCHWAB of 96, Deansgate, Manchester in the County of Lancaster,
Gas Engineer, do hereby declare the nature of my Invention for IMPROVEMENTS
IN THE CONSTRUCTION OF FURNACES USED IN THE RAISING OF STEAM 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 to certain improvements in the construction and
arrrangement of the back or bridge end of furnaces used in the raising of steam,
whereby the consumption of smoke is assured and a saving of fuel effected.
Hitherto the means employed for the purpose of combustion have consisted, for
the most part, in the admisson of air, either at the furnace doors, or by means of
valves in or about the bridge, which has the desired effect so far as the issuing of
smoke from the top of the chimney is prevented, but, the admission of air in such
quantities as is necessary to prevent smoke issuing from the top of the chimney is
attended with a loss of fuel, in consequence of the lowering of the temperature of
the flues, the result of such admission.
In my improved arrangement and construction of furnaces, the combustion of
smoke is effected without the disadvantage of lowering the temperature of the
flues, and a consequent waste of fuel, and consists in the construction of two
bridges at the back end of the furnace, the first is formed over the fire bars and
some three or four inches in front of the second. The coal, or fuel is fed into
the fire in such a manner, as to form an inclined plane from the fire door raising
almost to the top of the first bridge over which the gases driven off by the live fuel
below pass, they are then drawn by the draft between the first and second bridge,
and brought in contact with the live fuel, ignited and consumed.
I will now proceed to describe the same more in detail, reference being made to
the accompanying Drawings, in which Fig. 1 represents a longitudinal section
through a boiler furnace in which are built my improved bridges. Fig. 2. is a
transverse section through line a. b. and Fig. 3 is also a transverse section through
the line c. d.
The furnace is shewn fitted with ordinary grate bars A, and at the back end is
the ordinary bridge B, which is extended upwards and arched. B' following the
curve of the furnace plate C, and in front of the bridge B, is another arched
bridge E, having an opening F through the same for the purpose as hereinafter
described.

page_text: The fuel is fed to the furnace in the ordinary manner, but, distributed so as to
form an inclined plane from the fire door to the first arched bridge E, as indicated
by the wavey line H, thus filling up the opening between the fire bars A, and the
underside of the bridge E, so that no direct communication exists between the flue
behind the bridges and the furnace in front, except through the opening F. The
gases envolved therefrom must pass through the fuel itself, or through the
opening F and space G, between the two arched bridges E and B¹, and through
the space between the underside of B', and the top of the ordinary bridge B
through the part where the greatest heat exists and a complete combustion to
carbonic acid is the result.
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:
The arrangement and construction of the two bridges in the furnaces of steam
boilers substantially as and for the purposes described.
00
4001
WAUGH & CHAPMAN,
Agents for the Applicant,