Improvements in Feed Water Heaters for Steam Generators.
Year: 1899

page_text: Date of Application, 22nd Aug., 1899-Accepted, 23rd Sept.,.1899
COMPLETE SPECIFICATION.
Improvements in Feed Water Heaters for Steam Generators.
I, LEWIS CASS LANPHEAR, of 32, Alexander Street, Dorchester, Boston, in the
County of Suffolk, and State of Massachusetts, United States of America, Gentle-
man, 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 relation to. that class of feed-water heaters in which the
exhaust steam from the engine is utilized in raising the temperature of the water
introduced into the boiler.
Ordinarily, where the exhaust from the main engine is employed in connection
with a condenser, it is impossible to raise the temperature of the water to more
than 130 degrees Fahrenheit, and consequently, a greater consumption of fuel is
required or the boiler pressure is reduced.
The object of the present invention therefore is to provide a heater constructed
and arranged to impart a supplemental heating to the water which is initially
heated by the exhaust from the engine, whereby the temperature of the water at
the time it is delivered to the boiler is 212 degrees, or above, and the desired boiler
pressure can be maintained with a relatively low consumption of fuel.
To these ends the invention consists of a feed-water heater formed with two
separate uncommunicating chambers, one within the other, and one of the chambers
being heated by the exhaust-steam from one or more engines or pumps, said heater
having conduits for the water whereby it flows from one chamber to the other
before being delivered to the boiler.
The invention further consists of certain other combinations of parts or elements,
and in certain improvements in the construction and arrangement of parts of a
heater, all as I have illustrated upon the drawings, and shall now proceed to
describe in detail.
Reference is to be had to the accompanying drawings, forming a part of this
specification, the same letters designating the same parts or features, as the case
may be, wherever they occur.
Of the drawings:
--
Figure 1 represents a diagrammatic view of an engine plant with the heater
in section.
Figure 2 represents a longitudinal section through another form of heater.
Referring to the drawings, which show one embodiment of the invention
selected for illustration, the condensor a, the air pump b, and the feed-pump a
may all be of any approved style or pattern. The main engine and the boiler are
not shown, as their particular construction is immaterial, the exhaust-pipe from
the engine being indicated at d.
The feed-water heater shown as a whole at e comprises an outer casing e¹, an
inner casing e, and cylinder-heads e³, e to which said casings are secured in any
suitable way to form two concentric chambers e, e.
The exhaust-pipe d communicates with the inner chamber e, passing from
thence through the pipes to the condenser a, while the pipe b, c, for the

page_text: exhaust-steam from the air and feed-pumps leads into the outer or annular
chamber e and exhausts from there into the atmosphere through the pipe c².
The feed-water passes through a pipe f from the pumpe through the inner
compartment to the outer compartment or chamber, and from thence to the boiler.
It is evident that the arrangement of the tubes or conduits for the steam and
water in the heater may be varied as desired, and hence I have shown two different
ways of arranging them. In Fig. 1, the feed-water passes through a coil in
the inner chamber or compartment and a coil h in the outer compartment, there
being a coupling g¹ to connect the two coils. In this case, the exhaust steam from
the engine is discharged directly into the inner chamber and that from the
pumps into the outer chamber, whereby the coils g and h are in a steam bath.
In Fig. 2, however, the feed-water is discharged into the inner compartment,
while the exhaust steam passes there-through in bent tubes i, and said water
passes through the coupling g' into the outer coil h.
By this arrangement of the parts of the heater, the water is initially heated
in the inner chamber, and then raised to a high temperature in the outer annular
compartment or chamber whereby it is delivered to the boiler at substantially 212
degrees Fahrenheit.
The annular chamber forms a heating jacket for the inner chamber to pre-
vent the wastage of heat, and the two chambers operate mutually to sustain the
high temperature of each other.
This invention is preferably employed in plants where a condensing, compound,
or triple expansion engine and a condenser are used, but it will be understood
that it may be equally well used in other plants where a portion of the live steam
is employed as a heating agent.
The invention in utilizing only the exhaust steam from the engine and the two
pumps enables a saving in fuel and the maintenance of a high pressure in the
boiler.
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. A feed-water heater having an inner chamber, an outer annular chamber
uncommunicating with said inner chamber, conduits for the feed water leading
from one chamber to the other, means for delivering steam into the inner chamber
and exhausting it therefrom, and means for delivering steam into the outer
chamber and exhausting it therefrom, whereby the water is initially heated in
one chamber and receives a supplemental heating in the other chamber.
2. A feed-water heater comprising two casings, one within the other and form-
ing an inner chamber and an outer chamber which are separate and uncommunicat-
ing, separate means for introducing steam into and exhausting it from each of
said chambers, and means for passing water through one of said chambers into the
other chamber and delivering it from said last-mentioned chamber.
3. A feed-water heater comprising two casings, one within the other and form-
ing two separate uncommunicating chambers, a pipe extending through each
casing, an inlet and an exhaust pipe to introduce steam into and discharge it
from each of the chambers, a feed-water inlet extending into one of said cham-
bers, a feed water outlet extending out from the other of said chambers, and a
coupling for conducting the feed water from one of said chambers to the other
whereby exhaust steam from a main engine may be passed through one chamber
to initially heat the water, and exhaust steam from auxiliary engines or pumps
may be passed through the other chamber to increase the temperature of the
water.
4. A feed-water heater comprising two tubular casings, one within the other, a
plate at each end of the heater for closing the two casings whereby there are
formed two separate uncommunicating chambers, a separate steam inlet for each
chamber, and a separate outlet therefor, whereby steam from separate sources may

page_text: be admitted to said chambers respectively, and conduits for passing feed water
first through one chamber and then through the other chamber whereby the water
is initially heated in the first chamber and receives a supplemental heating in
the second chamber.
Dated this 4th day of July 19.
LEWIS CASS LANPHEAR.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.