IMPROVE- MENTS IN STEAM BOILERS
Year: 1884

page_text: I JOHN KIRKALDY of 40 West India Dock Road Poplar in the County of
Middlesex Engineer do hereby declare the nature of my invention for "IMPROVE-
MENTS IN STEAM BOILERS" to be as follows:-
According to this invention I construct a steam boiler with a number of helical
coils of tube placed within the fire box or flues of the boiler and passing from one
part of the water space of the boiler to another.
In some cases I make the coils alternately right and left handed spirals so that
when set side by side they may interlock with one another and allow of a greater
number of coils being set up within a given space this may also be advantageous
in producing a more thorough circulation and mixing of the water in the boiler.
In a vertical boiler the coils may advantageously be placed vertically within the
fire box so as to lead from the lower part of the water casing surrounding the fire
box to the water space of the boiler above the fire box-In a horizontal boiler
the tubes may advantageously be placed in an inclined position within the
internal flue or flues, but in either form of boiler the coils might if desired be placed
in other positions.
By constructing the main portion of the heating surface of a boiler in the above
manner the boiler can be made of great strength to withstand very high pressures
and will give greater heating surface for the space occupied by it.
Better
circulation will also be obtained and consequently a nearly uniform temperature
at the top and bottom of the water space so that the danger at present resulting
from cold dead water at the bottom part of the water space is done away with
and the expansion of the boiler when heated is equal throughout.
7001

page_text: Improvements in Steam Boilers.
I, JOHN KIRKALDY of 40 West India Dock Road Poplar in the County of
Middlesex 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 :—
According to this invention I construct a steam boiler with a number of helical
coils of tube placed within the fire box or flues of the boiler and passing from
one part of the water space of the boiler to another.
In some cases I make the coils alternately right and left handed spirals so that
when set side by side they may interlock with one another and allow of a greater
number of coils being set up within a given space this may also be advantageous
in producing a more thorough circulation and mixing of the water in the boiler.
In a vertical boiler the coils may advantageously be placed vertically within the
fire box so as to lead from the lower part of the water casing surrounding the fire
box to the water space of the boiler above the fire box. In a horizontal boiler the
tubes may advantageously be placed in an inclined position within the internal
flue or flues-but in either form of boiler the coils might if desired be placed in
other positions.
Better
By constructing the main portion of the heating surface of a boiler in the above
manner the boiler can be made of great strength to withstand very high pressures
and will give greater heating surface for the space occupied by it.
circulation will also be obtained and consequently a nearly uniform temperature at
the top and bottom of the water space so that the danger at present resulting from
cold dead water at the bottom part of the water space is done away with and the
expansion of the boiler when heated is equal throughout.
The drawings annexed shew examples of steam boilers constructed as above
described.
Figure 1 is a front view of a vertical steam boiler in which helical coils of tube
are placed within the fire box and open at their lower end into the water casing
surrounding the sides of the fire box and at their upper end into the water space
of the boiler above the fire box.
Figure 2 is a vertical section on a larger scale of the fire box of such a boiler.
Figures 3 and 4 are vertical sections of fire boxes in which modified constructions
are shown.
In these figures the helical coils of tubes are marked A-the tubes may be
corrugated tubes as shown on the left hand sides of these Figures or they may be
plain tubes as desired.
In Figure 5 I have shown a cross section and Figure 6 a longitudinal section of
a horizontal boiler formed with internal flues and with helical coils of tube A
placed within these flues in upright or inclined positions.
At Figures 7 and 8 I have shewn a longitudinal section and horizontal section
of part of the fire box of the boiler of a locomotive engine of ordinary type with
vertical coils placed within it on its two opposite sides.

page_text: 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
and
1. The construction of steam boilers with helical coils of tube placed in vertical
or inclined position within their fire boxes or flues and opening at their upper
lower ends into the water space substantially as described.
2. The construction of steam boilers substantially as hereinbefore described and
illustrated in the drawings annexed.