Improvements in Feed Water Heating and Water Circulating Apparatus for Steam Boilers.
Year: 1892

page_text: Date of Application, 30th July, 1892
Complete Specification Left, 29th Apr., 1893-Accepted, 2nd June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Feed Water Heating and Water Circulating
Apparatus for Steam Boilers.
I, DONALD BARNS MORISON, of Hartlepool Engine Works, Hartlepool, in
the County of Durham, Engineer do hereby declare the nature of this invention
to be as follows:-
My invention has for its object to heat the feed water for steam boilers, and also
to circulate the water in steam boilers.
In feed water heating and water circulating apparatus according to my invention,
the feed water is heated by means of hot water admitted into the feed water in a
pipe or vessel arranged between the feed pump or other suitable feeding apparatus
and the feed check valve or valves. The water is taken from the boiler and
preferably from the bottom thereof, or from such other part of the boiler as will
be benefited by the circulation. The apparatus may be variously arranged.
An arrangement suitable for use in conjunction with a marine engine and boiler
with a single acting feed pump worked by the engine is as follows. At the bottom
of the boiler is placed a non-return or other suitable valve, and on the feed pump
air vessel or at any convenient point between the feed pump delivery valves and
the feed check valves on the boiler, is a valve chamber that contains a non-return
or other suitable valve, and is connected by a pipe with the bottom of the boiler at
the point where it is fitted with a non-return or equivalent valve. In some cases
this latter valve may be dispensed with.
The action of the apparatus is as follows:-
On the downward or forcing stroke of the pump, the pressure in the feed
discharge pipe rises above the pressure in the boiler and the feed water enters the
boiler through the check valve or valves in the ordinary manner. On the upward
or suction stroke of the pump and on the closing of the check valves, the pressure
in the feed discharge pipe falls below the pressure in the boiler and consequently
water is forced from the bottom of the boiler into the said valve chamber and
thence into the delivery pipe. The water from the bottom of the boiler being
hotter than the feed water with which it is thus mixed, heats the feed water before
the same enters the boiler, and at the same time the water in the bottom of the
boiler where circulation is usually defective, is constantly withdrawn and again fed
into the boiler with the feed water, thus tending to equalize the temperature of the
water in the various parts of the boiler.
Dated this 30th day of July 1892
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Feed Water Heating and Water Circulating
Apparatus for Steam Boilers.
1, DONALD BARNS MORISON of Hartlepool Engine Works, Hartlepool in the
County of Durham, 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 :-
My invention has for objects to heat the feed water for steam boilers, and also
to circulate the water in steam boilers.

page_text: In feed water heating and water circulating apparatus according to my invention,
the feed water is heated according to one arrangement by means of hot water
admitted into the feed water in a pipe or vessel arranged between an intermittently
acting water feeding apparatus such as a single acting feed pump and the feed
check valve or valves, the hot water being taken from the boiler, preferably from
the bottom thereof, or from such other part of the boiler as will be benefited by
the circulation by a pipe provided with a non-return valve opening outward. The
apparatus may be variously arranged.
In the accompanying drawings,
Fig. 1 is an elevation illustrating diagrammatically a marine boiler with feed
water heating and water circulating apparatus according to this invention applied
thereto.
Fig. 2 is a longitudinal section of a mixing vessel forming part of the feed water
pipe and containing a perforated nozzle forming part of the hot water supply
pipe.
Figs. 3 and 4 are respectively a plan and cross section of such vessel; and
Fig. 5 shows partly in vertical section and partly in elevation, a modified
construction of mixing vessel.
Fig. 6 is a similar view to Fig. 1 illustrating a modified construction and
arrangement of the apparatus.
Figs. 7 and 8 are respectively a vertical section partly in elevation, and a plan
of part of such apparatus.
Fig. 9 is a similar view to Fig. 1 illustrating a further modified construction.
Referring to Fig. 1 of these drawings, 1 is a single acting feed pump having its
delivery outlet in connection with the lower end of an air vessel 3 that is in
connection with the boiler 4 by a feed water pipe 5 provided with a feed check
valve 6 as well understood. 7 is a pipe that is in connection with the water space
at the lower part of the boiler and with the interior of a mixing vessel 8 which is
arranged to form part of the feed water pipe 5. The pipe 7 is provided with
valves 9 and 10 either or both of which may be non-return valves arranged to open
outward. The vessel 8 which can be constructed in various forms may as shown
in Figs. 2 to 4 be provided internally with ribs or projections 8" adapted to cause
the feed water to take a circuitous course through the vessel in order that it may
be thoroughly mixed with the hot water from the bottom of the boiler which enters
the vessel 8 through the non-return valve 10 and perforated nozzle 7" the holes 11
in which are preferably arranged spirally as shown. 12 is a conical piece pro-
jecting within the nozzle 7, its object being to distribute the hot water entering
the nozzle and ensure a practically uniform flow through each of the holes 11.
The mixing vessel 8 may be formed with an upward extension arranged to form
an air vessel 8b as shown in Fig. 5 that will assist the action of the air vessel 3
(Fig. 1).
The action of the feed water heating and water circulating apparatus is as
follows:-
On the downward or foreing stroke of the pump, the pressure in the feed pipe 5
rises above the pressure in the boiler and the feed water consequently enters the
boiler through the check valve at 6 in the ordinary manner. On the upward or
suction stroke of the pump and on the closing of the check valve, the pressure in
the feed pump air vessel will fall below the pressure in the boiler and consequently
water will be forced from the bottom of the boiler through the nou-return valve 9
pipe 7 and valve 10 into the mixing vessel 8 where it will mix with the feed water
therein. The water from the bottom of the boiler being hotter than the feed water
with which it is thus mixed, heats the feed water before the same enters the boiler,
and at the same time the water in the bottom of the boiler, where circulation is
usually defective, is intermittently and frequently withdrawn and again fed into
the boiler with the feed water, thus teuding to equalize the temperature of the
water in the various parts of the boiler aud by heating the feed water before it
enters the boiler, to increase the efficiency of the heating surface.

page_text: In the modified arrangement illustrated in Figs. 6 7 and 8 the outer end of the
pipe 7 is placed in communication, it may be through a perforated nozzle or rose 7b,
with the upper end of the air vessel 3, which in this case also serves as the mixing
vessel. This arrangement works in a similar manner to that hereinbefore described.
hot water entering the air vessel and mixing with the feed water in the lower part
thereof when the pressure in such vessel is reduced upon the pump making its
suction stroke.
In the modified arrangement shown in Fig. 9 a feed donkey 1ª constructed to
work with the necessary intermittent action is employed for feeding the boiler 4
through the pipe 5 mixing vessel 8, and feed check valve 6 water flowing into the
mixing vessel 8, from the bottom of the boiler through the non-return valve 9 and
pipe 7 for heating the feed water in a similar manner to that hereinbefore described
with reference to the arrangement shown in Fig. 1.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. Feed water heating and water circulating apparatus for steam boilers, in
which the feed water is heated by means of hot water taken at intervals from the
boiler and admitted into the feed water in a pipe or vessel situated between the
feed pump and the boiler the said intervals depending on the intermittent action of
the feed pump and occurring on each return or suction stroke of the pump
substantially as herein described.
2. The improved feed water heating and water circulating apparatus for
steam boilers, constructed arranged and operating substantially as hereinbefore
described with reference respectively to and shown in Figs. 1 to 4 inclusive, or
modified according to Fig. 5; in Figs. 6, 7 and 8; and in Fig. 9 of the accom-
panying drawings.
Dated this 29th day of April 1893.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.