Improved Combined Surface and Jet Condenser for Steam Engines.
Year: 1886

page_text: Date of Application, 12th June, 1886:
Complete Left, 8th Mar., 1887.
Complete Accepted, 7th Apr., 1887.
PROVISIONAL SPECIFICATION.
Improved Combined Surface and Jet Condenser for Steam Engines.
I ALEXANDER BASIL WILSON of Holywood in the County of Down Ireland,
Mechanical Engineer do hereby declare the nature of this invention to be as
follows:-
Whereas Letters Patent No. 15909, 1885, hereinafter referred to as Invention A,
have been granted to me, for "An improved method and apparatus for returning part
of the exhaust from a Steam Engine to the Boiler combined with a portion of the
Injection Water when such is used, And whereas in the said Patent a quantity of
impure water is used to condense that portion of the steam which is uncondensed by
the pure water available, and whereas the pure water and that portion of the exhaust
steam condensed thereby is drawn from the condenser by a special feed pump and
delivered by it to the boiler. The air pump drawing the impure water with what
steam it condenses and discharging it to waste.
Now, the object of this Invention hereinafter referred to as B, is to reduce the
quantity of condensed steam carried away with the impure injection, water, and in
consequence to reduce the quantity of pure injection required to maintain a constant
quantity of water in the boiler.
In Invention A. Where a jet condenser is used it is divided into two chambers and
there are two injection valves, the smaller delevering pure water into the first chamber
next the exhaust inlet; the larger delevering impure water into the second chamber
away from the exhaust inlet and next the outlet to air pump.
In Invention B. Before the impure water is admitted into the second chamber of
the condenser I pass it over an extended surface either in tubes or otherwise in the

page_text: first chamber and the steam condensed into water by contact with such cooled surfaces,
I collect together with that condensed by the pure water, and pump them combined
direct to the boiler.
By these means I recover the greater part of the steam used by the engine unmixed
with the impure water and so reduce the pure injection required that if it be not
perfectly pure the small proportion used and required to maintain the proper quantity
of water in the boiler does not injure it.
I thus secure the advantages of a surface condenser as ordinarily used, without the
difference in pressure between the cooling water and the inside of the condenser, and
without a special circulating pump.

page_text: COMPLETE SPECIFICATION.
Improved Combined Surface and Jet Condenser for Steam Engines.
I ALEXANDER BASIL WILSON of Holywood in the County of Down Ireland,
Mechanical 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:-
Whereas Letters Patent No. 15909, 1885, hereinafter referred to as Invention A
have been granted to me for, "An Improved method and apparatus for returning part
of the Exhaust from a Steam Engine to the boiler, combined with a portion of the
injection water when such is used.'
And whereas in the said Patent a quantity of impure water is used to condense that
portion of the steam which is uncondensed by the pure water available.
And whereas the pure water and that portion of the exhaust steam condensed
thereby is drawn from the condenser by a special feed pump and delivered by it to the
boiler, the air pump drawing the impure water with what steam it condenses and
discharging it to waste.
Now the object of this invention hereinafter referred to as B. is to reduce the
quantity of condensed steam carried away and therefore lost by the impure injection
water and thereby to reduce the consequent waste of heat and quantity of pure injec-
tion required to maintain sufficient water in the boilers.
In Invention A the jet condenser is divided into two chambers, as described and
illustrated in the Specification and drawings of same, with two injection valves, the
smaller delivering pure water into the chamber next the exhaust of engine. The
larger delivering impure water into the chamber next to air pump suction.
In Invention B, before the impure water is admitted into the second chamber of
the condenser, I pass it through tubes inclosed within the first chamber, and exposing
an extended surface to the exhaust steam and the steam thereby condensed into water I
collect and return to the boiler either by itself or combined with any pure injection
and the steam condensed thereby that may be available.
a. By these means I recover in the form of pure water the greater part of the
steam used by the engine, unmixed, with impure injection.
b. I reduce the quantity of pure injection required to maintain the necessary supply
of feed water to the boilers.
c. I secure the advantages of a surface condenser as ordinarily used without a special
circulating pump. Without the great difference in pressure which exhists between

page_text: the cooling water in the interior of the tubes of a surface condenser as usually made,
and the vapor surrounding the tubes, and, without the aeration of the feed water
consequent on its passage thro the air pump before being pumped into the boilers.
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,
•
1st. An arrangement of combined jet and surface condenser as hereinbefore
described.
2. The combination of a combined jet and surface condenser with a feed pump as
described in the Specification and drawings of my patent, No. 15909, 1885.
Dated this Seventh day of March 1887.
ALEX. B. WILSON.