Improvements in Methods of Utilizing Induced Draught for the Heating of Boiler Feed Water by Means of Economisers, and also for Heating the Air to be Consumed in Boiler Furnaces.
Year: 1897

page_text: Date of Application, 8th Oct., 1897
Complete Specification Left, 8th July, 1898-Accepted, 24th Sept., 1898
PROVISIONAL SPECIFICATION.
Improvements in Methods of Utilizing Induced Draught for the
Heating of Boiler Feed Water by Means of Economisers, and also
for Heating the Air to be Consumed in Boiler Furnaces.
We, CHARLES HENRY WILSON, of 14, Grosvenor Square, London, in the County
of Middlesex, England, Shipowner, and WILLIAM BRUCE THOMPSON, of Thornbank,
Dundee, in the County of Forfar, Scotland, Engineer and Shipbuilder, do hereby
declare the nature of this invention to be as follows:
This invention relates to improvements in, methods of utilizing induced draught
for the heating of boiler feed water by means of economisers and also for heating
the air to be consumed in boiler furnaces, the object being to obtain the greatest
possible economy of fuel with maximum efficiency.
In carrying out our invention, as applied to marine boilers, we provide a series
of vertical tubes through which atmospheric air is drawn down and into air
chambers from which it passes into the furnaces. Between such sets of air tubes
are arranged a series of tubes through which the feed water is made to circulate
previous to its being forced into the boiler. The feed water heater is so designed
that scrapers can be used.
The heated products of combustion on passing from the furnaces, in the first
instance pass through the ordinary boiler tubes to the fronts of the boilers, from
thence they rise and then return to the back of such boilers giving up some of
their heat in their passage to the feed water heater. On leaving the feed water
heater they pass to each side and again return to the fronts of the boilers, on
this occasion in their passage heating the air which is passing down, through the
air tubes, after which they are drawn through an air propeller and sent into the
funnel.
The air propeller is so disposed between the funnel and the furnaces that induced
draught may be used.
Doors are so arranged in the casing that the products of combustion may be
made to give up their heat to the feed water heater and to the air heaters or they
may be induced to pass direct from the smoke box to the funnel by means of such
air propeller, or they may be allowed to pass from the smoke box to the funnel in
the usual way without the use of the air propeller.
Dated this 6th day of October 1897.
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Agents for Applicants.

page_text: Improvements in Methods of Utilizing Induced Draught for the
Heating of Boiler Feed Water by Means of Economisers, and also
for Heating the Air to be Consumed in Boiler Furnaces.
We, CHARLES HENRY WILSON, of 14, Grosvenor Square, London, in the County
of Middlesex, England, Shipowner, and WILLIAM BRUCE THOMPSON, of Thornbank,
Dundee, in the County of Forfar, Scotland, Engineer and Shipbuilder, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
This invention relates to improvements in methods of utilizing induced draught
for the heating of boiler feed water by means of economisers and also for heating
the air to be consumed in boiler furnaces, the object being to obtain the greatest
possible economy of fuel with maximum efficiency.
And in order that our said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, we have hereunto
appended an explanatory sheet of drawings in which the same reference numerals
are used to indicate corresponding parts in all the figures where shown, that is
to say: -
Figure 1, is a view of the front of a pair of marine boilers with part of the
smoke box removed to show the air and water tubes and looking in the direction
of the arrow D (Figure 2).
Figure 2, is a vertical section at B, B, (Figure 1) showing the air heating
tubes.
Figure 3, is a cross-section at C, C, showing in plan the arrangement of air and
water tubes.
Figure 4, is a vertical section at A, A, (Figure 1) showing the feed water
heater.
In carrying out our invention, as applied to marine boilers, we provide a series
of vertical tubes 10, through which atmospheric air is drawn down and into air
chambers 11, from which it passes into the furnaces 12, its course being indicated
by the arrows Z. Between such sets of air tubes are arranged a series of tubes 13,
through which the feed water is made to circulate previous to its being forced
into the boiler. The feed water heater is so designed that scrapers can be used.
For safety, the feed water tubes are preferably made of steel or malleable iron,
because it is found to be desirable that such heater be in, direct communication
with the boilers which are generally worked at considerable pressure.
The heated products of combustion on passing from the furnaces, in the first
instance pass through the ordinary boiler tubes to the fronts of the boilers, from
thence they rise and then return to the back of such boilers giving up some of
their heat in their passage to the feed water heater 13, their path being indicated
by the arrows X. On leaving the feed water heater they pass, as indicated by
the arrows Y, to each side and again return to the fronts of the boilers, on this
occasion in their passage heating the air which is passing down through the
air tubes, as indicated by the arrows Z, after which they are drawn through an
air propeller 14, and sent into the funnel 15. The air propeller is, in the illus-
tration, so disposed between the funnel and the furnaces that induced draught
may be used; although it is obvious that forced draught may be used instead in
conjunction with our invention, and that without in any way departing from its
disposition and scope.

page_text: Doors 16, 17, and 18, are so arranged in the casing that the products of com-
bustion may be made to give up their heat to the feed water heater and to the
air heaters, or they may be induced or forced to pass direct from the smoke box
to the funnel by means of such air propeller, or its equivalent, or they may be
allowed to pass from the smoke box to the funnel in the usual way without the use
of the air propeller.
For example: In the illustrations the door 16, is closed while the others 17,
and 18, are open, such an arrangement causing the products of combustion to
pass through the air propeller to the funnel and in their passage to heat the feed
water and the incoming air. By opening the door 16, and leaving the others as
shown, the water and air may be heated by natural draught. By opening the
door 16, and closing the door 17, the boilers may be worked in the usual way, that
is to say neither the air nor the feed water is heated. By closing the doors 16,
and 17, induced draught may be used without heating the air or the feed water.
Lastly, by opening the door 17, and closing the doors 18, the air may not be heated
while the feed water will, and that by either natural or induced draught, according
as the door 16, is either open or shut. 19, is a small engine for actuating the air
propeller.
$
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what
we claim is:-
(1) In steam boilers, the combination and arrangement of parts for heating the
feed water and the air to be consumed in the boiler furnaces, the arrangement
consisting of one or more boilers in combination with air tubes, feed water tubes,
air propeller for induced draught, and regulating doors, substantially as herein-
before described.
(2) In steam boilers, the combination of a feed water. heater with air heaters,
as described.
(3) In steam boilers, the combination of a feed water heater with air heaters
and regulating doors, as described.
(4) In steam boilers, the combination of a feed water heater with air heaters and
fans, as described.
Dated this 5th day of July 1898.
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Agents for Applicants.