Improvements in Feed-water Heaters.
Year: 1889

page_text: Date of Application, 27th Sept., 1889-Accepted, 2nd Nov., 1889
COMPLETE SPECIFICATION.
Improvements in Feed-water Heaters.
I, DONALD BARNS MORISON of 8 Albion Terrace 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, of Improvements in Feed-water Heaters, relates to that class of
heaters in which the feed-water supply to boilers is heated by means of steam, and is
specially applicable to marine engines fitted with evaporators for supplying fresh
auxiliary feed water to the boilers. The steam generated in the evaporator being
made to pass into the heater, where it mixes with the feed-water on its passage
from the hot well to the feed-pumps, and becomes.condensed so raising the temperature
of the feed-water.
The Feed-heater consists of a vessel into which the water to be heated enters by
one branch, and the steam to heat the same by another branch. The form of the
steam inlet is preferably that of a conical nozzle, and the shape of the outer casing
that of a concentric conical nozzle.
The steam will thus enter the heater in a jet and will be surrounded by the
water to be heated. The steam being condensed gives up its latent heat and part of
its sensible heat to the water which is thus raised in temperature.
In order to adjust the amount of steam admitted, I may place a conical plug within
the steam nozzle.
The said conical plug being adjustable by means of a screw and wheel or its
equivalent.
I append two sheets of explanatory drawings in which corresponding parts are
denoted by the same number.
Figure I sheet I shews a feed-heater without any arrangement for adjusting the
amount of steam admitted, and Figure II sheet I shows a feed-heater with adjusting
plug and screw in the steam inlet.
The water to be heated enters at 1 and the steam at 2. They meet in the
cone 3 where the steam becomes condensed, giving up part of its heat to the water.
The mixture passes on by virtue of the momentum imparted by the steam, and
flows out by 4.
In Figure II the amount of steam admitted to heat the feed-water may be regulated.
by means of the screw 5 and plug 6, so that the water may be raised to the desired
degree of temperature.
Figure III Sheet II is a combined view of an evaporator and feed-heater with
connections as usually fitted to a marine engine in accordance with this invention.
The evaporator is shewn at 7. The steam generated in the evaporator passes by pipe 8
to the branch 2 on the feed-heater.
The flange 1 of the feed-heater is bolted directly to the hotwell of the main
engine. The feed-water enters. by this flange, and having been heated by the steam
as previously described leaves the heater by the flange 4 and is thence led by pipes to
the feed-pump suction, to be pumped into the boilers.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1 The combination of on avenerator and food hontor
for
utilizing the stoom

page_text: generated in an evaporator to heat the feed-water, and operating substantially as
described and illustrated.
2. Feed-water heaters constructed and operating substantially as described and
illustrated.
D. B. MORISON.