Improvements in the Construction and Arrangements of Furnaces and Appliances therefor where Hydro-carbon Oil in Conjunction with Compressed Air or Steam are Used as Fuel.
Year: 1886

page_text: Date of Application, 3rd Apr., 1886.
Complete Left, 3rd Jan., 1887.
Complete Accepted, 4th Feb., 1887.
Improvements in the Construction and Arrangements of Furnaces
and Appliances therefor where Hydro-carbon Oil in Conjunction
with Compressed Air or Steam are Used as Fuel.
I EDWIN NATHANAEL HENWOOD of 22 Great Saint Helens in the City of London
Naval Architect and Engineer do hereby declare the nature of this invention to be as
follows:-
This Invention has for its object, improvements in the Construction and Arrange-
ments of Furnaces and Appliances therefor where Hydro-carbon Oil in conjunction
with Compressed Air or Steam are used as Fuel whereby I am enabled to obtain a
much greater economy in the production of Steam than has hitherto been obtained in
practice.
In carrying out my invention I build-up within the ordinary space allotted for the
furnace in marine or land boilers an inner furnace with a double crown of fire-brick
set in fire clay the bottom of which together with the front except where openings are
required and the sides from about one half to two thirds the length from the point are
or may be close work the sides for about one third the length from the further end
having openings therein or may be made open work (brick and space). The Crowns
of the Furnaces are made with openings the upper closed parts shutting-in the
openings of the lower crown the end of the furnace is made with suitable openings for
the escape of the flame or gases into the "Combustion Chamber" and tubes or flue.
At a suitable distance from the front of the furnace and in the lower Chamber I place
a fire brick" saucer at right angles to the "blow-pipe" or " injector."
"3
"
The “blow-pipe” or injector is or may be of the well known plan the inner tube
being used for the Hydro-Carbon Oil and the outer surrounding tube for Compressed-
air or Steam. I also connect to the Hydro-Carbon supply tube a tube or pipe with
suitable stop cocks or valves to readily clear with compressed air or steam the oil tube
or pipe in case of getting choked.
or
I also introduce for the more complete combustion of the gases heated air into the
"Combustion Chamber" and at or about the further end of the furnace by means
of tubes running from the front of the furnace and fitted with adjusting valves at their
near ends. Such tubes. may be fitted either between the sides of the furnace and the
boiler or carried through the boiler itself.

page_text: with Compressed-air or Steam are Used as Fuel.
I EDWIN NATHANAEL HENWOOD of 22 Great Saint Helens in the City of London
Naval Architect and 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 has for its object improvements in the Construction and Arrange-
ments of Furnaces and Appliances therefor where Hydro-Carbon Oils in conjunction
with Compressed Air or Steam are used as Fuel whereby I am enabled to obtain a
much greater economy in the production of Steam than has hitherto been obtained in
practice.
may
In carrying out my invention I build up within the ordinary space allotted for the
Furnace in Marine or Land Boilers an inner furnace of fire-brick or other refractory
material set in fire-clay with a double Crown and by preference continue the same into
the Combustion Chamber of Marine Boilers the bottom together with the front and
further end except where openings are required being close work the sides also being
close work except at the near end of the upper furnace or Combustion Chamber which
be open
work brick-and-space or suitable openings left the Crowns of the
furnaces or Combustion Chambers may be made with suitable openings the upper Crown
shutting-in the openings in the lower Crown and by preference I make the lower
Crown close work for about two thirds its length with an opening at the further end
of about one third its length and the upper Crown close work for about two thirds its
length from the further end leaving an opening of about one third its length at the
near end. At a suitable distance of about 20 inches from the front of the Furnace
in the lower chamber I place a fire-brick saucer or dash brick or of any other
refractory material at right angles to the blow-pipe or injector.
The injector or blow-pipe is or may be of the well known plan the inner tube being
used for the Hydro-Carbon oil and the outer surrounding tube for compressed air or
Steam.
I also connect to the Hydro-Carbon oil supply pipe a tube or pipe with suitable
Stop Cocks and valves to readily clear with compressed air or Steam the oil supply
pipe and tube in case of its getting choked.
I also introduce for the more complete combustion of the gases heated air into the
several combustion chambers by tubes or openings in the fire-brick sides running from
the front of the Furnace to about three fourths the length of the lower furnace or

page_text: combustion chamber and from the front of the Furnace to about mid-way in the upper
furnace or combustion chamber and from the front of the Furnace into the combustion
chamber of the Boiler their ends in front of the Furnace being fitted with sliding
doors for closing or adjusting the supply of air and some of them may be carried
through the Boiler itself.
In raising steam I either use steam from an auxiliary boiler or compressed air from
a blower which may be worked by hand or steam power the blast pipe being connected
to the union on the drain cock of the steam supply pipe and until steam is obtained in
the Boiler I close the doors of the air supply tubes or openings.
Having now described the said Invention I will proceed to show by the aid of the
accompanying sheet of diagrams in what manner the same is or may be carried out.
Fig. 1. Is a longitudinal section of a Boiler showing the fire-brick arrangements
and tubes for supplying heated air to the several combustion chambers.
Fig. 2. Is an elevation of the iron front to the Furnace of the Boiler showing the
openings and doors therein the fire-brick front in its immediate rear having similar
apertures otherwise is of close brick-work set in fire-clay.
Fig. 3. Is a section at A. A. in Fig. 1. showing how the fire-brick arrangements and
air tubes are disposed.
Fig. 4. Is a section at B. B in Fig. 1. showing the liko at this part of the Furnace.
Fig. 5. Is a section at C. C. in Fig. 1. showing the like at this part of the Furnace.
Fig. 6. Is a section at D. D. in Fig. 1. showing the fire-brick end of the Furnace.
Fig. 7. Shows position of the injector or blow-pipe and steam pipe with suitable
Stop-Cocks for clearing the oil supply pipe and inner tube of injector or blow-pipe.
The letters of reference denote similar parts in each of the diagrams.
E. Indicates the fire-brick furnace or lower combustion chamber.
F. The upper furnace or combustion chamber.
G. The combustion chamber of the Boiler.
H. The fire-brick saucer or dash brick.
I. The crown of the lower furnace or combustion chamber.
J. The crown of the upper furnace or combustion chamber.
K. Apertures or pipes for the supply of heated air to the combustion chamber of
the Boiler G.
L. Apertures or pipes for the supply of heated air to the lower combustion
chamber E.
M. Apertures or pipes for the supply of heated air to the upper combustion
chamber F.
N. Apertures in the sides of the upper fire-brick furnace or combustion chamber F.
O. Fig. 7. The steam supply pipe to the injector or blow-pipe S leading from a
coil pipe placed in the uptake to superheat or dry the steam before passing to the
injector or blow-pipe.
P. The pipe for clearing the oil supply pipe and inner tube of injector or blow-pipe
with steam.
Q. The oil supply pipe to the injector or blow-pipe leading from a supply tank
placed at or above the level of the top of the Furnace.
R. The drain cock of the steam supply pipe with union for attaching a blast pipe
for raising steam in the first instance until about 5 lbs. pressure is obtained in the
Boiler and when an auxiliary boiler is not used.
S. The injector or blow-pipe.
T. Stop-cocks.
U. Doors to furnace and air supply tubes.
V. Sight holes.
I would have it understood that I do not confine or limit myself to the precise
forms or details represented so long as the distinguishing features of my invention are
maintained and I do not intend to claim any of the parts as hereinbefore described and
illustrated when taken separately and apart from the combination and application
thereof in the manner and for the purposes hereinbefore described and illustrated.

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
1. The arrangements and combination of parts constituting the furnace and several
combustion chambers substantially as herein before described and illustrated and any
mere modification thereof.
2. The above in combination with the arrangements for supplying heated air to the
several combustion chambers substantially as hereinbefore described and illustrated and
any mere modification thereof.