IMPROVEMENTS IN STEAM GENERATORS
Year: 1881

page_text: LETTERS PATENT to William Cooke and Daniel Mylchreest, of Liverpool, in
the County of Lancaster, Marine Engineers and Naval Architects, for an
PROVISIONAL SPECIFICATION left by the said William Cooke and Daniel
Mylchreest at the Office of the Commissioners of Patents on the 25th June
1881.
WILLIAM COOKE and DANIEL MYLCHREEST, of Liverpool, in the County of
Lancaster, Marine Engineers and Naval Architects. "IMPROVEMENTS IN STEAM
GENERATORS."
The main object of our said Invention is to provide a durable, simple, and
economical steam generator, mainly, although not exclusively, for use on board ship,
in which the steam space and grate and heating surfaces are increased; heating of
the water uniformly throughout the mass is effected; objectionable strains in the
structure are avoided; steam can be rapidly raised after lighting the fires, and in
which the heating gases are caused to travel in the manner best calculated to
produce the most advantageous results.
For the purposes mentioned we make the outer shell cylindrical, and arrange and
combine the furnaces, flues, tubes, and heating surfaces in the novel manner now to
be described. The furnaces are internal, are usually two or three in number, and
open into a fire or flame chamber in or at the rear of the generator. The said fire
or flame chamber communicates with one or more return flues or tubes extending
from the back to the front, and there opening into a smoke box or chamber, the top
of which forms a stoking platform. Two or more delivery or discharge tubes open
into the said box or chamber, and extend from the front to the rear of the generator
and terminate in an uptake or flue.
The heated gases and products of combustion pass from the furnaces to the fire
or flame chamber at the rear of the furnace, and heat the water in the generator
near the top so as to cause a rapid evolution of steam. The heating gases then
flow through the return flue or Blues, tube or tubes, and enter the smoke box or

page_text: chamber at the front of the generator; during their passage they raise the
temperature of the water near the bottom of the generator. The said heating
gases finally pass through the delivery or discharge tubes to the uptake or flue;
whilst passing to the said uptake or flue they heat the water not sufficiently acted
upon by the passage of the said gases through the furnace and return flues. It
should be noticed that the gases when hottest act on the hotter water, and
that as they cool they act on cooler water, thus enabling a large proportion of the
heat to be abstracted from the said gases before they pass to the uptake or flue.
For the purpose of urging the fires and raising steam rapidly when commencing
to fire, a passage or passages controlled by a damper or valve, or damper or
valves, is or are made to lead directly from the furnace to the uptake or flue."

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Cooke and Daniel Mylchreest in the Great Seal Patent
Office on the 24th December 1881.
WILLIAM COOKE and DANIEL MYLCHREEST, of Liverpool, in the County of
Lancaster, Marine Engineers and Naval Architects. "IMPROVEMENTS IN STEAM
GENERATORS."
The main object of our said Invention is to provide a durable, simple, and
economical steam generator, mainly, although not exclusively, for use on board ship,
in which the steam space and grate and heating surfaces are increased; heating of
the water uniformly throughout the mass is effected; objectionable strains in the
structure are avoided; steam can be rapidly raised after lighting the fires, and in
which the heating gases are caused to travel in the manner best calculated to
produce the most advantageous results.
For the purposes mentioned we make the outer shell cylindrical, and arrange and
combine the furnaces, flues, tubes, and heating surfaces in the novel manner now to
be described. The furnaces are internal, are usually two or three in number, and
open into a fire or flame chamber in or at the rear of the generator. The said fire
or flame chamber communicates with one or more return fues or tubes extending
from the back to the front, and there opening into a smoke box or chamber, the top
of which forms a stoking platform. Two or more delivery or discharge tubes open
into the said box or chamber, and extend from the front to the rear of the generator,
and terminate in an uptake or flue.
The heated gases and products of combustion pass from the furnaces to the fire
or flame chamber at the rear of the furnace, and heat the water in the generator
near the top so as to cause a rapid evolution of steam. The heating gases then
flow through the return flue or flues, tube or tubes, and enter the smoke box or
chamber at the front of the generator; during their passage they raise the
temperature of the water near the bottom of the generator. The said heating
gases finally pass through the delivery or discharge tubes to the uptake or flue;
whilst passing to the said uptake or flue they heat the water not sufficiently acted
upon by the passage of the said gases through the furnace and return flues. It
should be noticed that the gases when hottest act on the hottest water, and that
as they cool they act on cooler water, thus enabling a large proportion of the heat
to be abstracted from the said gases before they pass to the uptake or flue.
For the purpose of urging the fires and raising steam rapidly when commencing
to fire, a passage or passages controlled by a damper or valve, or dampers or valves,
is or are made to lead directly from the furnace to the uptake or flue.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a transverse section, and Fig. 2, a longitudinal section of a steam
generator constructed under our Invention. a is the cylindrical shell; b, b', 'are two
internal furnaces opening into fire or flame chambers c at the rear of the generator;
flues or tubes d; d', lead from the said chambers c to the smoke box e, the top ƒ of
which forms a stoking platform; gare delivery or discharge tubes leading from
the said smoke box e to the uptake or flue h. The arrows show the direction in
which the heated gases and products of combustion travel; i, i, dampers or valves
secured to the shafts j, and free to be moved so as to open or close the passages k, k³,
to the uptake or flue h.
Fig. 3 is a transverse section, and Fig. 4, a longitudinal section of another steam
generator constructed under our Invention here there are three furnaces 1 1 73

page_text: only one return flue or tube d, and a number of delivery or discharge tubes g. The
two chambers c and e are also both within the generator, instead of projecting in
the manner described and illustrated in Figs. 1 and 2. Parts corresponding to
those in Figs. 1 and 2 are distinguished by the same letters of reference. The
arrows show the direction of the currents.
It will be obvious that only one of the chambers c, e, might project beyond
the shell of the generator, and that the number of furnaces, flues, and tubes in each
generator may be varied without departing from our Invention.
Having now particularly described and ascertained the nature of the said
Invention in such manner that others will be enabled to carry our improvements
into effect, we claim,―
'
First. Constructing steam generators with the novel arrangement and combination
of parts herein specified, for the purposes set forth.
Second. Steam generators constructed with the novel arrangement and
combination of furnaces, flues, tubes, and heating surfaces, substantially as herein
set forth.
Third. In steam generators constructed as herein specified, the passages k and
dampers i, arranged substantially as and for the purposes set forth.
In witness whereof, we, the said William Cooke and Daniel Mylchreest, have
hereunto set our hands and seals, this Twenty second day of December, in
the year of our Lord One thousand eight hundred and cighty one.