Improvements in Steam Generators.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Steam Generators.
I, THOMAS CASSIENET PALMER, of the Firm of W. J. Fraser & Co., 98, Com-
mercial Road East, in the County of London, Engineer, do hereby declare the
nature of this invention to be as follows:-
This invention relates to improvements in steam generators.
According to the invention I provide a set or series of steam generating tubes
arranged approximately in the form of a series of concentric cylinders the inner
A single large
and outer sets of tubes being close together so as to form walls.
down-take tube is placed within the inner set of small tubes. Both the generating
tubes and the down-take tube open at their ends into water vessels, the up-take
vessel being prolonged to form a steam space or dome.
The small steam generating tubes in the vicinity of the fire-box of the steam
generator are curved to allow the free passage of the gases of combustion between
them. The said fire-box is arranged near one end of the sets or series of tubes
and consists of a body of light sheet metal lined with fire-brick. The gases of
combustion from the fire-box pass among and across the generating tubes and
escape at the other end of the cylinder through openings formed by curving the
tubes similarly to the tubes forming the inlet openings. The generator is
encased in a shell of a suitable light non-conducting material.
I can combine with my generator an arrangement for drying and superheating
the steam.
Steam generators constructed as above described are economical in first cost,
working and maintenance, and clearly defined passages are provided for the
products of combustion of the furnace and for the water and steam thereby
ensuring free water circulation and free generation of steam.
זי
1007
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Steam Generators.
I, THOMAS CASSIENET PALMER, of the Firm of W. J. Fraser & Co., 98, Com-
mercial Road East, in the County of London, Engineer, 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 improvements in steam generators.
According to the invention I provide a set or series of steam generating tubes
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page_text: arranged approximately in the form of a series of concentric cylinders, the inner
and outer sets of tubes being close together so as to form walls. A single large
down-take tube is placed within the inner set of small tubes. Both the generating
tubes and the down-take tube open at their ends into water vessels, the up-take
vessel being prolonged to form a steam space or dome.
The small steam generating tubes in the vicinity of the fire-box of the steam
generator are curved to allow the free passage of the gases of combustion between
them. The said fire-box is arranged near one end of the sets or series of tubes
and consists of a body of light sheet metal lined with fire-brick. The gases of
combustion from the fire-box pass among and across the generating tubes and
escape at the other end of the cylinder through openings formed by curving the
tubes similarly to the tubes forming the inlet openings. The generator is
encased in a shell of a suitable light non-conducting material.
I can combine with my generator an arrangement for drying and superheating
the steam.
To enable my invention to be fully understood I will describe it by reference to
the accompanying drawings in which :--
Figure 1 is a vertical section of a boiler constructed according to the
invention:
Figure 2 is a half transverse section of the boiler taken through the fire-box:
Figure 3 is a sectional elevation of a vertical boiler having my improvements
applied thereto.
a is the shell of the boiler, the said shell being of any suitable known con-
struction, bis the furnace thereof, the said furnace being as above described
preferably formed of a body of light sheet metal lined with fire-brick, and c is
the chimney.
d, d are the steam generating or up-take tubes which are arranged so as to
approximately form a series of concentric circles the outer of which forms an
outer wall as clearly shewn in Figure 2. An inner wall can also be formed by
a similar arrangement of tubes if desired.
e is the single large central down-take' tube arranged within the series of small
up-take tubes d, d. f is the lower water vessel and y the upper water vessel into
which both the generating tubes and the down-take tube open.
As above described and as shewn clearly in Figures 1 and 2 the alternate
steam generating tubes d, d are curved or arranged so that spaces are left
between the individual tubes forming the wall at both ends thereof near one of
which the fire-box b is arranged so that the gases of combustion from the said
fire-box can pass through the openings between the individual tubes at this
end and then flow towards the other end through the openings and escape
through the openings at this end into the chimney.
It will be obvious that the water tubes must be sufficiently inclined to ensure
an efficient circulation.
is a coil for superheating the steam, the said coil opening at one end into
the steam dome and then coiling around the down-take tube to which it forms
a kind of jacket. This jacket protects the down-take tube from receiving too
much heat.
In Figure 3 I have shewn a vertical boiler the construction of which is similar
to that of the boiler above described with the exception that the up-take tubes d, d
are not straight and do not form a closed wall although they can be so made
if desired. A superheating coil can also be employed with this type of boiler
when required.
Steam generators constructed as above described are economical in first cost,
working and maintenance, and clearly defined passages are provided for the
products of combustion of the furnace and for the water and steam thereby
ensuring free water circulation and free generation of steam.
Having now particularly described and ascertained the nature of my said

page_text: invention and in what manner the same is to be performed, I declare that what I
claim is:-
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1. In steam generators the employment of a series of steam generating tubes
arranged in the form of concentric circles and forming a closed wall on the outside
(or on the inside and outside) and of a single large down-take tube, all the said
tubes being in communication with an upper and a lower water vessel and the
steam generating tubes being arranged to form inlet and outlet openings for
the gases of combustion from the furnace, substantially as hereinbefore described
and illustrated in the accompanying drawings.
2. In a steam generator of the kind described in the preceding claiming clause
the described arrangement of the steam superheating tube which coils around
the down-take tube so as to form a kind of jacket, substantially as and for the
purpose hereinbefore described.
3. The improved steam generators hereinbefore described and illustrated respec-
tively in Figures 1 and 2 of the accompanying drawings.
Deted this 3rd day of Jonuar 1898
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.