IMPROVEMENTS IN HEATING WATER FOR THE SUPPLY OF STEAM BOILERS
Year: 1856

page_text: LETTERS PATENT to John Greenwood, of Rawden, near Leeds, in the
County of York, for the Invention of "IMPROVEMENTS IN HEATING WATER
FOR THE SUPPLY OF STEAM BOILERS."
Sealed the 20th May 1856, and dated the 29th February 1856.
PROVISIONAL SPECIFICATION left by the said John Greenwood at
the Office of the Commissioners of Patents, with his Petition, on the
29th February 1856.
Leeds, in the County of York, do
Invention for "IMPROVEMENTS IN
I, JOHN GREENWOOD, of Rawden, near
hereby declare the nature of the said
HEATING WATER FOR THE SUPPLY OF STEAM BOILERS," to be as follows:-
The improvements relate to heating the feed water for boilers by causing
it to pass through a pipe or pipes, or tubes, placed in folds in the flues from
the furnace, the successsive folds being laid in a horizontal direction against or
near to the sides or other inner surfaces, and lengthwise of the flues or flue-
spaces surrounded or enclosed by the boiler; but I avoid as much as possible
placing them in contact with the surface of the boiler, in order not to abstract
heat which would go to heat the water in such boiler. By thus arranging the
feed pipes the water in its passage to the boiler will become heated by the
heat given off from the smoke, and heated air passing from the fire in the
furnace without the draft being obstructed.
On first lighting the fires in the morning, or at other times when the
water in the feed pipes is not yet in circulation, and too great exposure of
those pipes to heat would tend to generate steam therein, which by blowing
out the water would leave them liable to be burnt, I, by dampers, or such like
means, cause the smoke and heated air from the furnace for a time to pass
directly to that part of the flue where such feed pipes are not applied;. or

page_text: where this cannot be done, I bring into operation a moveable screen to act in
protecting the pipes for the time. I also admit cold air to that part of the
flue where the feed pipes are fixed to aid in keeping them cool until, by the
generation and use of steam in the boiler, the feed pipes are brought into use
to keep up the supply, when I open the passage for the smoke and heated air
to where the feed pipes are fixed, and I exclude the cold air therefrom.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Greenwood in the Great Seal Patent Office on the
29th August 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN.
GREENWOOD, of Rawden, near Leeds, in the County of York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her. Letters
Patent, bearing date the Twenty-ninth day of February, in the year of our
Lord One thousand eight hundred and fifty-six, in the nineteenth year
of Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said John Greenwood, Her special licence that I, the said John
Greenwood, my executors, administrators, and assigns, or such others as I, the
said John Greenwood, my executors, administrators, and assigns, should at any
timè agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN HEATING WATER FOR THE SUPPLY OF STEAM BOILERS," upon the condition
(amongst others) that I, the said John Greenwood, my executors or 'admi-
nistrators, by an instrument in writing under my, or their, or one of their
hands and seals, should particularly describe and ascertain the nature of
the said Invention, and in what manner the same was to be perforined, and
'cause the same to be filed in the Great Seal Patent Office within-six calendar
months next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Greenwood do hereby declare the
nature of the said Invention, and in what manner the same is to be per-
forined, to be particularly described and ascertained in and by the following
statement thereof (that is to say) :-
The improvements relate to heating the feed water for boilers by causing
it to pass through a pipe or pipes, or tubes, placed in folds in the flues from
the furnace, the successive folds being laid in a horizontal direction against or

page_text: near to the sides or other inner surfaces, and lengthwise of the flues or flue-
spaces surrounded or enclosed by the boiler; but I avoid as much as possible
placing them in contact with the surface of the boiler, in order not to abstract
heat which would go to heat the water in such boiler. By thus arranging the
feed pipes the water in its passage to the. boiler will become heated. by the heat
given off from the smoke and heated air passing from the fire in the furnace
without the draft being obstructed. On first lighting the fires in the morning,
or at other times when the water in the feed pipes is not yet in circulation, and
when too great exposure of those pipes to heat would tend to generate steam
therein, which by blowing out the water would leave them liable to be burnt,
I, by dampers, or such like means, cause the smoke and heated air from the
furnace for a time to pass directly to that part of the flue where such feed
pipes are not applied; or when this cannot be done, I bring into operation
moveable screen to act in protecting the pipes for the time. I also admit cold
air to that part of the flue where the feed pipes are fixed to aid in keeping
them cool, till by the generation and use of the steam in the boiler, the feed
pipes are brought into use to keep up the supply, when I
open the
passage for the.
smoke and heated air to where the feed pipes are fixed, and I exclude the cold
air therefrom. But that the nature of my said Invention, and the means
which I adopt in carrying the same into effect, may be fully understood, I will
proceed to describe the Drawings annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shows a longitudinal section, Figure 2, a plan, and Figure 3, an
end view of a stationary boiler, with parts arranged according to my Inven-
tion. a, a, is the boiler; b, b, the furnaces or fire-places; and c, the flues
therefrom, interior of the boiler, and which open on leaving the boiler into
two passages d and e, one on each side of the boiler, by which the smoke and
heated particles therefrom are conducted back along the side of the boiler to
aid in heating the water therein. These flues, d and e, then again unite in
one fluef, passing under the boiler in the direction of the arrow; all which is,
thus far, similar to what is ordinarily used, and, separately considered, forms
no part of my Invention. g is the pipe, arranged according to my improve-
ments, for conducting the supply water to the boiler. This pipe, it will be
seen, is laid in folds along one of the side flues (the flue d,) till it terminates
in the boiler at gl; and I prefer that it should in the various folds incline
somewhat towards its opening to the boiler, in order that any steam generated
therein may have a tendency at once to pass into the boiler; and it is so
placed that it receives heat given off from the smoke and heated particles

page_text: when such are allowed to pass along that flue. But in order that when first
lighting the fire in the boiler, or when otherwise it is desirable to keep the
feed pipes as cool as possible, there are dampers h and i applied, and at such
time the damper h will be closed, closing the passage to the flue d, whilst the
damper i will be up in order that all the smoke and heated particles may pass
away by the passage e without passing into the passage d. But so soon as the
water in the boiler is heated sufficiently to generate steam, and that steam is
applied; I close the damper i and raise the damper h, so as to cause the
smoke and heat from the furnace in part to pass. by the flue d, in order that
heat may be given off to the feed pipe g.
Figure 4 shows the section of a marine or other multitubular boiler, with my
improvements adapted thereto. In this case the feed pipe g is applied in the
smoke box, and it is screened, when desired, by means of the screen j, which
consists of a series of plates hinged at j', so that, when in the position indicated,
the heat from the tubes 6 may act on the feed pipe g; but when they are in
the position indicated by dotted lines, that pipe will be to a considerable extent
protected from such heat. The plates ; are connected together in any suitable
manner so as to be opened or closed simultaneously.
b
Having thus described the nature of my said Invention, and in what manner
I carry the same into effect, I would have it understood that I do not confine
myself to the precise details shown, as variations may be made in the parts
without departing from the peculiar character of my Invention; but what
I claim is, the heating of the feed water to steam boilers, by causing it to pass
through a pipe or pipes, or tubes, placed in folds and longitudinally in the flues
or flue spaces surrounded or enclosed by the boiler; and, in connection there-
with, the adaptation of parts so that such pipe or pipes may, when desired, be
protected from the too free action of heat given off from the fire-place or
furnace.
In witness whereof, I, the said John Greenwood, have hereunto set my
hand and seal, this Twenty-seventh day of August, in the year of our
Lord One thousand eight hundred and fifty-six.
Witness,
W. WHITAKER.
JOHN GREENWOOD. (I..s.)