Year: 1887

page_text: Date of Application, 27th May, 1887
Complete Left, 25th Feb., 1888
Complete Accepted, 29th Mar., 1888
I, PETER EVANS, of Drury Lane, Liverpool, in the County of Lancaster, Engineer
do hereby declare the nature of the said invention to be as follows:-
This Invention consists in so constructing and connecting the furnaces of steam
generators having multiple furnaces that the gases and products of combustion from one,
or more of such furnaces can be led into other, or others of such furnaces and over
the fire, or fires therein. This may be effected in any convenient way, for example
by providing a front combustion chamber connected to the back of one furnace, or
set of furnaces and to the front of the other furnace, or set of furnaces, or instead of
the front combustion chamber, the furnaces may be connected in front from the smoke
box in such a way that the gases and products of combustion from one furnace, or set
of furnaces may be led into another furnace, or set of furnaces and over the fire, or
fires therein.
In applying my Invention to say a marine steam generator of the usual tubular
type, having three furnaces, I provide a front combustion chamber connected by tubes
to a back combustion chamber, which is connected to one, or two of the furnaces,
in the usual way, and the front combustion chamber is connected to the front of the
other furnace, or furnaces, so that the gases and products of combustion pass from
the first furnace to the front combustion chamber and into the furnace, or furnaces
with which it is connected and over the burning fuel therein before entering the
chimney.
In operation the fires in the different furnaces may be kept at different states, the
fires in the first furnace being thick and the fires in the second furnace being thin,
and kept as incandescent as possible. Fans, or steam jets may be employed to cause
the gases, or products of combustion to pass from the first furnace, or furnaces to the
second furnace, or furnaces, and to supply air for combustion.
Dated this Twenty sixth day of May 1887.

page_text: I, PETER EVANS of Drury Lane, Liverpool, in the County of Lancaster, Engineer
do hereby declare the nature of the said invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the following
statement:
This Invention, consists in so constructing and connecting the furnaces of steam
generators having multiple furnaces that the gases and products of combustion from
one, or more of such furnaces can be led into other, or others of such furnaces and
over the fire, or fires therein. This may be effected in any convenient way, for
example by providing a front combustion chamber connected to the back of one
furnace, or set of furnaces and to the front of the other furnace, or set of furnaces, or
instead of the front combustion chamber, the furnaces may be connected in front
from the smoke box in such a way that gases and products of combustion from one
furnace, or set of furnaces may be led into another furnace, or set of furnaces and
over the fire, or fires therein.
In applying my Invention to say, a marine steam generator of the usual tubular
type, having three furnaces, I provide a front combustion chamber connected by tubes
to a back combustion chamber, which is connected to one, or two of the furnaces in
the usual way and the front combustion chamber is connected to the front of the
other furnace, or furnaces, so that the gases and products of combustion pass from
the first furnace to the front combustion chamber and into the furnace, or furnaces
with which it is connected and over the burning fuel therein before entering the.
chimney.
In operation, the fires in the different furnaces may be kept at different states,
the fire in the first furnace being thick and the fires in the second furnaces being
thin, and kept as incandescent as possible. Fans, or steam jets may be employed to
cause the gases, or products of combustion to pass from the first furnace, or furnaces
to the second furnace, or furnaces and to supply air, for combustion.
The beforegoing being the nature and purposes of my Invention, I will now proceed to
describe more in detail how the same may be carried out into practical effect, in its
application to various types of steam generators, reference being had to the accom-
panying seven sheets of Drawings, which make 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 several views and figures.

page_text: Figure 3 is a sectional elevation of a steam generator of the tubular type having
two furnaces and with my improvements applied thereto.
Figure 4 is a cross section of the steam generator taken through the line xx
Figure 3.
Figure 5 is a sectional elevation of a steam generator of the locomotive tubular typo
having two furnaces and with my improvements applied thereto.
Figure 6 is a cross section of the steam generator taken through the line xx
Figure 5.
Figure 7 is a sectional elevation of a steam generator of the vertical type having
two furnaces and with my improvements applied thereto.
Figure 8 is a cross section of the steam generator taken through the line xx
Figure 7.
Figure 9 is a sectional elevation of a steam generator of the tubular type having
outside furnaces and with my improvements applied thereto.
Figure 10 is a cross section of the steam generator taken through the line xx
Figure 9.
Figure 11 is a sectional elevation of a steam generator of the return flue type
having outside furnaces and with my improvements applied thereto.
Figure 12 is a cross section of the steam generator taken through the line a
Figure 11.
Figure 13 is an elevation shown partly in section of a steam generator of the
Lancashire type having two flues and with my improvements applied thereto.
Figure 14 is a cross section taken through the line. Figure 15 is a cross
section taken through the line y y and Figure 16 is a horizontal section taken, through
tho line of the steam generator shown at Figure 13.
In the example of the carrying out of my Invention shown at Figures 1
and 2 A is the shell of the steam generator; B the steam chest. c, d and e
are the furnaces. f, g and h are the back combustion chambers." i is a
front central combustion chamber and is the uptake, or smoke box. is
a nest of tubes running from the combustion chamber to the combustion
chamber i. m a nest of tubes running from the combustion chamber g to the
uptake and n is a nest of tubes running from the combustion chamber / to the
uptake k. is a duct from the combustion chamber i to the furnace d, provided
with a valve, or damper p². q is a duct from the combustion chamber i to the
furnace e and provided with a valve, or damper q'. r are steam nozzles in the
ducts p and q is the steam pipe to the nozzles 1. Air nozzles may be substituted
if desired.
In working the steam generator shown at Figures 1 and 2, the fires in the furnaces c d
and e are kept at different states, namely the fire in the furnace c being what is known as
a thick fire whilst the fires in the furnaces d and e are what are known as thin fires
and are kept in as incandescent a state as possible. The course of the gases and
products of combustion from the thick fire in the furnace c is from the combustion
chamber through the tubes to the combustion chamber i and through one, or
the other, or both of the ducts p, q to the furnace d, or e, or d and e, to the back
combustion chamber g, or h or g and h and through the tubes m, or n or m, n to the
uptake k, the gases being assisted to enter the furnaces de by the action of the steam
or air jets through the nozzles. By means of the dampers p', q', the course of the
gases can be changed as desired to the furnace d or e. Thus, when the furnace d iš
being stoked the gases can by closing the damper p¹ be sent into the furnace e and
over the incandescent fire therein and when the furnace e is being stoked by closing
the damper q', they can be directed into the furnace d and when the fires in both
the furnaces d'and e are incandescent the said gases can be passed over both. Thus
the products of combustion from the thick fire are passed over the incandescent fuel
of the thin fires, or either of the furnaces d and e can be worked independently of
the furnace c and direct to the uptake.
The front plate of the combustion chamber i is provided with doors, or plugged
openings through which the tubes / can be cleaned.

page_text: It will be obvious that there are many ways of carrying out my Invention as above
set forth, some of which I will now describe."
Referring to Figures 3 and 4, c, d are the furnaces, each having a separate com-
bustion chamber and g at the back and i at the front, connected by tubes 1, the
chambers each having openings to the uptake k provided with dampers.
In working this form of steam generator the fires in the furnaces c d are kept, at
different states, namely when one fire is being stoked, the other fire is incandescent
and the products of combustion from the green, or fresh fire in one furnace can by
working the dampers and p¹ q' be directed through the ducts p, or 7 and over
the incandescent fire in the other furnace, the firing being alternate.
Referring to Figures 5 and 6 the two furnaces c and d are connected by the duct a
and can, by closing the ducts p and q alternately, be worked alternately, namely the
products of combustion from a fresh fire in the furnace c can be passed over an
incandescent fire in the furnace d and from the furnace d to the combustion chamber
through the duct q or vice versa. A door is provided in the front plate of the
combustion chamber i to clean the tubes.
Referring to Figures 7 and 8, the two furnaces c and d are connected by ducts a
and by closing one, or other of the dampers p¹ q¹ of the forked uptake k the products
of combustion can be passed from a fresh fire in one furnace through the ducts a to
and over an incandescent fire in the other furnace.
In Figures 9 and 10 there is illustrated an outside fired steam generator having
two furnaces c d two back combustion chambers ƒ and g and two front combustion
chambers. The furnaces c d are connected to the combustion chambers i
by the ducts p q having dampers p¹ q¹. The combustion chambers i ¹ are also
provided with openings into the uptake k and having dampers . The working
of this form of steam generator is the same as that described in reference to Figures
and 4.
In Figures 11 and 12 there is illustrated another form of outside fired steam
generator having two furnaces c d and back underneath combustion chambers f, g
connected by ducts f¹g with the flues bb the front of said flues being connected by
ducts (baving dampers p' q') with the furnaces c d and also with the uptake k
through the open ends and dampers. The working of this form of steam generator
is the same as that described in reference to Figures 3 and 4.
C
In Figures 13. 14. 15. and 16 there is illustrated a steam generator of the
Lancashire type having two furnaces c d. These furnaces c d are connected by the
ducts p with the chamber i and the flues fg are connected with the chamber i by
the ducts p having dampers which are also common to the ducts con-
necting the flues fg to the chimney ducts k. In working, the products of com-
bustion pass from one furnace say c which has a thick, or fresh fire through the flue f
into the chamber i and thence through the duct p into the furnace d and over the
incandescent fire therein, passing through the flue g and opening to the duct k
leading to the chimney, the firing of the furnaces c d being alternate, and the course
of the products of combustion being changed by working (opening and closing) the
dampers p q and ³, i to suit.
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
First. The construction of steam generators herein described by which the gases
and products of combustion from one, or more, of the furnaces of such steam generators
can be led into other, or others of such furnaces and over the fire, or fires therein, as
set forth..
Second. The method substantially as herein described of firing, or working steam
generators, which method consists in alternately passing the gases and products of
combustion from one, or more furnaces over the fire, or fires of another, or other
furnaces as set forth.
Third. The means substantially herein described by which the gases and products

page_text: of combustion from one, or more furnaces of a steam generator can be passed over
the fire, or fires of another, or other furnaces of such steam generator, which means
consist in providing a second combustion chamber, or chambers having ducts p q so
communicating between the furnaces and such combustion chambers and provided
with dampers p¹ gl and with, or without steam, or air jets, that the course of the
gases and products of combustion is through the furnaces and parts in the manner
described.
Fourth. The furnacos, combustion chambers, ducts and dampers of a steam
generator, arranged, combined and operating as set forth with reference to Figures 1
and 2 of the Drawings.
Fifth. The furnaces, combustion chambers, ducts and dampers of a steam generator,
arranged, combined and operating as set forth with reference to Figures 3 and 4 of
the Drawings.
Sixth. The furnaces, combustion chambers, ducts and dampers of a steam generator,
arranged combined and operating as set forth with reference to Figures 4 and 6 of
the Drawings.
Seventh. The furnaces, combustion chambers, ducts and dampers of a steam
generator, arranged, combined and operating as set forth with reference to Figures 7
and 8 of the Drawings.
Eighth. The furnaces, combustion chambers, ducts and dampers of a steam
generator, arranged, combined and operating as set forth with reference to Figures 9
and 10 of the Drawings.
Ninth. The furnaces, combustion chambers, ducts and dampers of a steam generator,
arranged, combined and operating as set forth with reference to Figures 11 and 12
of the Drawings.
Tenth. The furnaces, combustion chambers, ducts and dampers of a steam generator,
arranged, combined and operating as set forth with reference to figures 13. 14 15
and 16 of the Drawings.
Dated this 24th day of February 1888.
PETER EVANS.
By Cheesbrough & Royston,
15, Water Street, Liverpool,
Patent Agents.