IMPROVEMENTS IN FEEDING BOILERS WITH A COMBINATION OF WATER AND AIR
Year: 1886

page_text: and Air.
"
I FRANZ HEINRICH MOLDENHAUER of No 1 Niebelungengasse in the City of
Vienna, Austria, Engineer, do hereby declare the nature of my Invention for
"IMPROVEMENTS IN FEEDING BOILERS WITH A COMBINATION OF WATER AND AIR
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
My present invention relates to improvements in feeding boilers with a com-
bination of water and air, being improvements on my invention secured to me by
Letters Patent No 14,800% for feeding boilers with water in the form of fine spray
in combination with compressed air. In carrying my said invention, as protected
by my said Letters Patent No 148008, into effect I found it necessary to provide
the boiler with a feeding of water in order to prevent the same from becoming red
hot and in making further trials found that my invention could be applied with
enormous advantage to feeding all kinds and constructions of boilers and with or
without reducing the water to the form of fine spray.
As the air is fed into the boiler to increase the pressure in the same by the
expansion of the said air it will be evident that the pressure in the boiler will be
immediately reduced when the feed of air is cut off.
If now a three way cock be applied to the air pipe or tube before the same
enters the boiler the air feed can be cut off and the air coming from the pump be
led off or allowed to escape so that the manometer will immediately show a decrease
of pressure in the boiler."
For this purpose the cone of the three way cock can be connected to the
governor of the machine and the aforesaid operation effected automatically. In
this manuer I attain an instantaneous decrease of pressure and safety against the
danger of explosion such as has not been attained by any process known up to the
present time..
My experiments have proved to evidence that the presence of a large quantity
of air in the boiler causes an enormously rapid rise of pressure in the same as
demonstrated by the manometer consequently by instantaneously cutting off the
air feed when a certain pressure is reached all fear of explosion, as far as this is
possible to foresee is avoided.
Aly experiments have furthermore proven that the introduction of air into the
boiler is of enormous advantage even when the water fed into the said boiler is
not reduced to spray form but is fed into the boiler in the ordinary manuer and
air fed in by a separate pipe or tube it being perfectly immaterial at what part of

page_text: the boiler the air-pipe enters, whether the same opens direct into the steam space
or chamber or first into the water space or compartment and passing from thence
.through the water into the steam chamber or space.
In order to still further explain my said invention and the method of carrying
the same into effect I make reference to the drawing accompanying this specification
and representing the application of the air tube to an ordinary boiler although it
will be evident to all persons connected with this class of engineering that it is
perfectly immaterial what size or construction of boiler is employed.
Instead of leading the water and air pipes f, g, as shown in the drawings to
my said Patent No 14,80085-into a common pipe r, I now propose to introduce the 1
water and air through separate pipes into the boiler as represented in the accom-
panying figure in which three different methods of feeding in the air, are
represented at 11 and 1.
According to the method illustrated through the tube or pipe the air from the
air pump is led into the steam space of the boiler and above the water line;
according to the air is led into the boiler beneath the water line and into the
water contained in the boiler-The pipe enters the boiler above the water line
and is then led downwards towards the bottom of the boiler and into the water in
the same.
According to the modification as represented by the pipe 12 the air is led into the
lower part of the boiler under the surface of the water in which case I prefer to
provide the said pipe or tube with a suitable valve to prevent any water from
flowing into the air pump. It is also not necessary to pump water and air
continuously into the boiler but both air and water are,pumped into the boiler
according to the stand of the manometer and the stand of water in the boiler and
consequently water alone and air alone can be pumped into the said: boiler.
It will be evident from the foregoing that my said invention can as afore-
mentioned be applied to boilers of any construction and any size.
It n 3.
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
+
1. The application and employment of my improved. system of feeding boilers
with a combination of water and air in which the air and water are in contra-
distinction to the process described and claimed in my Letters Patent No '14,80055,
not fed continuously into the said boiler through a common pipe or tube but the
air and water fed continuously or intermittently into the boiler direct from the
water or air pumps through separate pipes or tubes according to requirements and
so that air alone or water alone can be fed into the said boiler substantially as and
for the purpose set forth in the foregoing specification.
1 .
2. In steam boilers which are fed, with a combination of water and air, the
application and employment of a three way cock in the air supply pipe or tube
before the same enters the boiler so that the air supply can be instantaneously cut
off and the air from the air pump led off or allowed to escape substantially as and
for the purpose set forth in the foregoing specification and shown on the accom-
panying drawing.