Improvements in and relating to Steam Boilers.
Year: 1899

page_text: Date of Application, 18th Aug., 1899
Complete Specification Left, 4th May, 1900-Accepted, 30th June, 1900
PROVISIONAL SPECIFICATION.
Improvements in and relating to Steam Boilers.
I, THOMAS WHIMSTER, of 67, West Nile Street, in the County of the City of
Glasgow, Shipowner, do hereby declare the nature of my invention to be as
follows:-
This invention has reference to improvements in and relating to steam boilers
for marine or land steam raising purposes.
As applied for marine purposes my improved boiler differs from the ordinary
type in having its furnaces and tubes carried right through from end to end
instead of terminating in an inside combustion chamber. Two or more sets of
tubes according to circumstances, are provided for each furnace and are placed
one above the other over each furnace or round it. For this purpose the boiler
may be made oblong instead of cylindrical. Smoke boxes are fitted on each
end of the boiler, divided so that the flames and hot gases from the furnaces are
turned into the lower set of tubes and after passing through these they are
turned into the upper set of tubes through which they pass to the funnel.
Access is given through the front smoke boxes for sponging the tubes and
through the after smoke boxes for removing soot.
The after smoke boxes are enclosed in a casing which is continued under and
along the bottom of the boiler and up to the furnace doors. Air is forced by
a fan or otherwise through this easing in such a way as to be heated first, by
the waste heat escaping to the funnel, and second, by its passage round the
lower smoke box. The heated air then passes along the bottom of the boiler
which it heats and then enters the furnaces the supply being regulated by a
valve or other device. Provision is also made for admitting the hot air into the
smoke boxes direct if required to aid combustion.
This method of heating the bottom of the boiler can be adapted to ordinary
marine boilers by heating the air by means of the waste gases escaping to the
funnel and passing it straight into the pan or casing under the boiler and from
thence it is led to the furnace mouth.
Improvements in and relating to Steam Boilers.
I, THOMAS WHIMSTER, of 67, West Nile Street, in the County of the City of
Glasgow, Shipowner, do hereby declare the nature of my invention and in what
manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement, that is to say:-
My invention has reference to improvements in and relating to steam boilers.
And in order that my said invention and the method of working it may be

page_text: properly understood I have hereunto appended a sheet of explanatory drawings
in which Figure 1 is a front sectional elevation the right hand half of which
shows the front of the boiler and the left half the same with front combustion
chamber or smoke box and hot air casing attached. Figure 2 is a longitudinal
section, Figure 3 is the back elevation, and Figure 4 is a longitudinal elevation
showing the hot air attachment.
My boiler can be made cylindrical or oblong in shape, the furnaces A and
tubes B and C being carried right through from end to end. At the back is
a casing cut in two by a suitable division E, the lower half D covering the
lower set of tubes B and the furnace A forming a combustion chamber, and
the upper half K carrying the upper set of tubes C and rising to the funnel
forming an uptake. In front is a smoke box or second combustion chamber F
covering both sets of tubes.
"It will thus be seen that the flame and hot gases of the furnaces A pass into
the combustion chamber D which leads them into tubes B through which they
pass to chamber F and thence through tubes C into the uptake K and so to
the atmosphere.
The chamber F is fitted with doors so that the tubes can be sponged from the
Tront. At the back, doors G, and H Figure 4, are provided for both combus-
tion chamber and uptake so that soot falling to the bottom of these divisions
can be easily removed.
Outside the casings K and D is another casing M which is carried under and
along the boiler and up to the furnace mouth. Through this casing air is forced
after receiving its initial heat from the waste heat in the funnel.
In order to aid combustion, if required, an inlet P is made in the back com-
bustion chamber casing, so fitted as to be opened or shut by anyone looking
through the window Q. By means of this window it is possible to see into the
combustion chamber and the man in charge is thereby enabled to regulate the
supply of air through the furnace doors and also through the inlet P, so as to
often perfect combustion. To further assist combustion a connection R is made
between the hot air casing M and one of the tubes B so that heated air can be
admitted to chamber F at the option of the man in charge who looking through
the window S, Figure 4, can open or shut valve T, Figure 1, through which
the heated air comes, as he sees it is required to maintain combustion.
If it is not desired to supply heated air the hot air casing can be dispensed with
and the inlet P and valve T will then be available for admitting cold air at the
discretion of those in charge.
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:-
First. In steam boilers the method of heating the bottom of the boiler by
means of heated air, substantially as and in the manner herein set forth.
Second. In steam boilers the method of returning the flames and hot gases
from the furnaces more than once through the boiler and of regulating the
supply and admission of hot and cold air substantially as set forth.
Third. Steam boilers having the furnaces and tubes carried right through
from end to end, the combustion chambers back and front being fitted with
windows and arranged for the admission, under control, of hot or cold air and
the hot air casing all in combination or in part combination substantially as
set forth.
uated the 3rd April 1000