Improvements in the Construction and Arrangement of Boiler Furnaces, Flues, and Ashpits.
Year: 1886

page_text: Date of Application, 5th July, 1886.
Complete Left, 25th Mar., 1887.
Complete Accepted, 26th Apr., 1887.
Improvements in the Construction and Arrangement of Boiler
Furnaces, Flues, and Ashpits.
I PHILIP HENRY SADLER of Murdoch Road Handsworth, in the County of Stafford
Engineering Draughtsman do hereby declare the nature of this invention to be as
follows:-
This invention relates to the better retaining or confining of the heat of the
furnaces &c., of boilers, and also to the utilization of such heat, being specially
applicable to that class of boilers known generally as colonial boilers, where the
furnaces, ashpit, and flues, are formed within a wrought iron shell, and lined more or
less with fire brick, and where such shell is also arranged to receive, attached thereto,
the boiler, which is generally tubular in form. It is generally found that from the
present method of construction there is a considerable radiation and waste of heat from
the exterior of the casing wherein the furnace, flues, ashpit &c., are situated, which is
much augmented where the fire brick lining has become damaged, or faulty in
erection, so much so, as to ignite or set fire in some instances to the articles or
substances in close proximity thereto.
My object in this my invention is to overcome this difficulty and danger, and in
order to do so, I construct upon the exterior of such parts of the boiler, furnace,
ashpit &c. casing, where practicable, another or outer casing, leaving an air or
annular space between the two casings. This air space being for the purpose of
diverting, absorbing, or nonconducting the heat emanating from the inner casing.
This space may be further used in some cases if desired, for the purpose of utilizing
such heat by forming it into a feed water heater. Or, I may use such space for
heating the air supply before it enters the furnace, by providing suitable entrances for
such air, into the said air space, then confining it therein until sufficiently heated, by
causing it to travel over a sufficient amount of heated surface, and thence passing it
into the furnace proper.
Diihin 2nd love of July 1886
CHARLES T. POWELL,
Agent for the Applicant.

page_text: Furnaces, Flues, and Ashpits.
I PHILIP HENRY SADLER of 170 Cape Hill, Smethwick, and late of Murdoch Road,
Handsworth, both in the County of Stafford, Engineering Draughtsman do hereby
declare the nature of this 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 relates to the better retaining and confining of the heat of the
furnaces &c., of boilers, and also to the utilization of such heat, being specially
applicable to that class of boilers known generally as colonial boilers, where the
furnace, ashpit and flues, are formed within a wrought iron shell, and lined more or
less with fire brick, and where such shell is also arranged to receive attached thereto,
the boiler, which is generally tubular in form.
It is generally found that from the present method of construction, there is a con-
siderable radiation and waste of heat from the exterior of the casing wherein the
furnace, flues, ashpit &c. are situated, which is much augmented where the fire brick.
lining has become damaged or faulty in erection, so much so, as to ignite or set fire
in some instances, to the articles or substances in close proximity thereto.
My object in this my invention is to overcome this difficulty and danger and, in
order to do so, I construct upon the exterior of such parts of the boiler, furnace,
ashpit, &c. casing, where practicable, another or outer casing, leaving an air, or
annular space between the two casings; this air space being for the purpose of
diverting, absorbing or nonconducting the heat emanating from the inner casing.
This space may be further used in some cases if desired, for the purpose of utilizing
such heat by forming it into a feed water heater; or, I may use such space for heating
the air supply before it enters the furnace, by providing suitable entrances for such
air into the said air space, then confining it therein until sufficiently heated, by causing
it to travel over a sufficient amount of heated surface, and thence passing it into the
furnace proper.
I will now further proceed to more clearly describe this my invention having
reference to the accompanying illustrative sheet of drawings upon which are figures
and letters of reference.
Fig. 1 is a cross section of a boiler with a casing, after the manner of my
invention.
Fig. 2, is a longitudinal section of the boiler, and outer casing,
Fig. 3 is an external front elevation of the boiler and outer casing.
Fig. 4 is a sectional plan of the inner or furnace casing.
Fig. 5 is a plan of the outer or air casing.
The boiler illustrated is one of the aforesaid tubular type. Over the
furnace casing, I construct an outer casing, at a suitable distance, so as to
desired proportional area of air space, according to the size of the fire grate.
inner or
obtain a
The said

page_text: air space may be divided or subdivided either transversely or longitudinally as may
be required, and part may be used as a feed water heater, but I prefer generally the
utilizing of nearly the whole of the plate casing surface for the purpose of effecting
economy of fuel, by proventing the entrance of a large body of cold air, at a low speed,
as is usually the case, and in place thereof, passing small bodies of heated air, at a
high velocity.
Openings are provided at A, Figs. 1, 2 & 4, which allow the air to enter between
the two casings. The fire and ashpit doors being wholly (or partially) closed, the
incoming (now heated) air, enters the furnace proper, from the annular air space G,
by the openings B & C, Figs. 1, 2, & 4, passing through the inner casing, and also
through suitable openings in the fire brick lining at C.
One or more sets of openings may be placed on either of the sides D & E, as
desired.
The aforesaid openings or entrances may in some instances if desired be opened or
closed by means of damper doors or their equivalents.
It will be seen, that upon the drawing, the air casing is divided at or about the
centre of its length by a packing or partition piece F, so that the air supply in each
compartment may be heated separately and independent of each other, and passed
upwards, either below or above the fire grate as may be required. Other divisions
of compartments may be made if preferred. Some one or more of these divisions
may be prepared without air holes, and used as a feed water heater or heaters if
desired.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1st. The absorbing, diverting, or non-conducting of the heat emanating or
radiating from boilers, their furnaces, ashpits, or flues, of the "colonial" or similar
type, by means of an outer casing, provided with air currents, and. openings, in the
manner and for the purposes specified, and illustrated.
2nd. The utilization of the radiating heat from such boilers, their furnaces, &c.,
to the heating of the air for the combustion chamber, or, of the water for feed
supply, in the manner herein set forth and illustrated.
Dated this 24th day of March 1887.
CHARLES T. POWELL,
Applicant's Agent.