IMPROVEMENTS IN THE FURNACES OF STEAM GENERATORS
Year: 1884

page_text: I GEORGE RODGER of Michaelson Villa, Barrow in Furness in the County of
Lancaster, Engineer do hereby declare the nature of my said Invention for
IMPROVEMENTS IN THE FURNACES OF STEAM GENERATORS to be as follows:-
My Invention relates to a certain improved arrangement of fire bars and furnace
fittings of steam generators, whereby I am enabled to work their furnaces as gas
producers and with closed fire grates and under a forced draught of steam and air.
In carrying out my Invention and in its application to the furnaces of a cylin-
drical steam generator for marine purposes, I provide such furnaces with close
stoking and close ash pit doors, which when closed do not admit of the entrance
of any air from the outside into the furnaces. I set the fire bars of the furnaces
with an inclination from the stoking door and I form a hook, or projection at the
front end of such fire bars, so that they hook onto the front bearer, near the back
of the furnace and just behind the fire bars I form a brick bridge a sufficient space
being left between the bridge and the fire bars to allow for clinkering. This is
effected by slicing and sliding the clinkers down the inclined fire bars until they
fall down between the ends of the fire bars and the bridge into the ashpit. The
furnace is worked as a gas producer by a forced draught, which is supplied by
a steam jet, or other suitable blower, which discharges air into the ashpit. Addi-
tional air to support a secondary combustion is supplied at the bridge by means of
passages through the bridge, opening out into the ashpit and also by opening out
one, or more tubes from the front of the generator to the combustion chamber.
Dated this second dew of Anril 1884

page_text: Í GEORGE RODGER of Michaelson Villa, Barrow-in-Furness in the County of
Lancaster, Engineer do hereby declare the nature of the said Invention for
IMPROVEMENTS IN THE FURNACES OF STEAM GENERATORS 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 a certain improved arrangement of fire bars and furnace
fittings of steam generators whereby I am enabled to work their furnaces, as gas
producers and with closed fire grates and under a forced draught of steam and air.
The following is a description of my Invention in such full, clear and exact terms
as to enable any one skilled in the art to which it belongs to put into practice and
use the same, reference being had to the accompanying sheet of Drawings, making
a part of this Specification and to the letters and figures of reference marked
thereon, like letters and figures being used to denote the same, or corresponding
parts throughout the various views and figures.
Figure 1 is a sectional elevation of a fire grate, furnace, and combustion chamber,
of a steam generator, arranged and fitted according to my Invention.
Figure 2 is a front view of Figure 1.
Figure 3 shows a modification of Figure 1.
Figure 4 is a front view of Figure 3.
In carrying out my Invention and in its application to the furnaces of a cylin-
drical steam generator for marine purposes I provide the furnaces A with close
stoking doors B and with close ashpit doors C as shown at Figures 1 and 2, which
when closed do not admit of the entrance of any air from outside into the
furnaces A, the requisite air being supplied to the ashpit D by an air injector
apparatus such as E hereinafter more particularly described. Or as a modification
of the above I only partly close the front of the ashpit D and I provide an
aperture C¹ which is proportioned to admit the requisite amount of air when in
combination with a steam jet, or jets F as shown at Figures 3 and 4 and forms
an injector hereinafter more particularly described.
I set the fire bars H of the furnaces A with an inclination from the stoking
door B and I form a hook, or projection h at the front end of each of such fire bars,
so that the fire bars H will hook onto the front bearer J in manner such as shown at
Figure 1 or in manner such as shown at Figure 3. The back of the fire bars H
are supported by a back bearer J. Behind the fire bars H and at an opposite
angle thereto and rising from the bottom of the furnace, I form a brick fire
bridge K and I leave a sufficient space at L between the bridge K and the back
end of the fire bars H to allow for clinkering, which is effected by "slicing" and
sliding the clinkers down the inclined fire bars H until they fall through the space
at L between the ends of the fire bars H. and the bridge K into the ashpit D.
The furnace A is worked with a deep fire as shown and as a gas producer by
a forced draught which is supplied by the air injector E which consists of a series
of concentric nozzles C¹ which are formed in and fitted on the ashpit. doors C as
shown at Figures 1 and 2; or as a modification of this arrangement, the front of
the ashpit D is only partly covered leaving an aperture C¹ as shown at Figures 3
and 4. Air is forced through the nozzles C, or aperture C¹ into the ashpit D by
the steam jet device F which consists of the pipes provided with nozzles f¹. The

page_text: pipes fspring from the vertical trunnion pipe fi which forms the hinge for and
carries the ashpit door C and is provided with a stuffing box f³ and is carried by
and is free to turn in the brackets f* so that the steam jets F and ashpit door C
can be swung open when required. Steam is supplied to the steam jets F from the
boiler through the pipe and cocks -In lieu of the steam jet device F and
ejector E any suitable blowing apparatus which will force air into the closed, or
partly closed ashpit D may be used. Additional air to support a secondary com-
bustion in the combustion chamber A¹ is supplied at the bridge by means of
passages K¹ formed in the bridge K as shown in dotted lines and also by opening
out one, or more of the tubes M of the generator from the front of the generator
into the combustion chamber A¹. I effect this by prolonging the tubes M at M'
through the sinoke box N as shown in the Drawings. Air for secondary combustion
may also be supplied through tubes P which pass through the back water space of
the generator into the combustion chamber as shown.
In "double ended steam generators" the air is admitted either through the
front tubes M, or through short tubes passed through the shell of the generator
into the combustion chamber sides and bottom.
The furnaces A may be lined with fire brick all their length where there is room,
and the combustion chambers may also be lined with fire brick as shown.
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 steam generators, having furnaces of the type herein described, providing
the fire bars H with projections (such as h) and arranging such fire bars H at
an inclination to a bridge having an opposite inclination and leaving a space
between the end of the fire bars and the bridgo as herein set forth for the purposes
specified.
2. The combination of ashpit doors (such as C) provided with steam and air
nozzles FE and mounted on a hollow trunnion f2 as herein set forth for the
purposes specified.
3. The combination of steam nozzles such as F, hollow trunnions such as f³ as
herein set forth for the purposes specified operating as described.
4. The combination of the injectors such as E F, furnace A, bridge K and air
ducts such as K¹ M' and P as herein set forth and shown in the Drawings and
operating as described.
Dated this thinkinth'dan
D
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