An Improved Apparatus for Eliminating Air and Gases and Carbonate of Magnesia from Feed Water for Boilers which has been Purified by Means of Caustic Magnesia or Basic Carbonate of Magnesia.
Year: 1886

page_text: An Improved Apparatus for Eliminating Air and Gases and
Carbonate of Magnesia from Feed Water for Boilers which
has been Purified by Means of Caustic Magnesia or Basic
Carbonate of Magnesia.
We EDUARD BOHLIG, Chemist, and GUSTAV OTTO HEYNE, Engineer, both of
the City of Leipsig in the Empire of Germany do hereby declare the nature of our
Invention for AN IMPROVED APPARATUS FOR ELIMINATING AIR AND GASES AND
CARBONATE OF MAGNESIA FROM FEED WATER FOR BOILERS WHICH HAS BEEN
PURIFIED BY MEANS OF CAUSTIC MAGNESIA OR BASIC CARBONATE OF MAGNESIA
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
Our invention relates to an improved apparatus for eliminating air, gases and
carbonate of magnesia from feed water for steam boilers which has been purified or
treated by means of caustic magnesia or basic carbonate of magnesia.
In order to carry our said invention into effect steam boilers which are fed with
water purified by treating the same with magnesia are provided with a mixing and
clarifying apparatus A which carries an injector I with regulating spindle S, a water
supply pipe R with the outlet end arranged near the top or cover of the apparatus,
a tubular mantle M arranged in the vessel A and attached to the cover of the
same.
The apparatus is further provided with a tube F for letting off the sediment, a
combined feed water and circulation pipe R¹ with coupling K, an air outlet cock H
and a water outlet pipe T.
Feed water which has been previously purified with Magnesia enters the
apparatus through the supply pipe L the injector I and the supply pipe R which is
directed upwards towards the cover of the apparatus after having become mixed
with a quantity of water out of the boiler sucked up by the injector.
The gases (carbonic acid and other gases) are driven out of this mixture of feed
water and circulating water from the boiler (which should have a temperature of
110° to 115° Centigrade or 230° to 239° Fahrenheit, & which said temperature
can be controlled by the pyrometer P) by the abovementioned warming of the said
water, to the highest part of the apparatus A from whence they can escape by
means of the cock H.

page_text: The mixture of feed and circulation water is led downwards by the mantle M,
deposits carbonate of magnesia in the form of a sediment at the bottom of the
apparatus A and ascends in clarified condition so as to escape through the outlet
pipe T to the boiler-The magnesia deposited at the bottom of the apparatus A is
periodically drawn off through the sediment pipe F and the tubing connected with
the same.
:
When the forewarmed. feed water has a temperature of about 60° Centigrade or
140° Fahrenheit and there is a pressure in the boiler of about 4 atmospheres, the
proportion of feed water to boiler water will be 1 to 1,10.
The size of the apparatus A must be so chosen that the mixed water remains
about one minute in the said apparatus A.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be carried into effect, we declare that
what we claim is :-
1. The arrangement application and employment of a mixing and clarifying
apparatus A provided with an upwards leading supply pipe R, a mantle M con-
nected to the cover of the said apparatus and a combined feed and circulation pipe R¹
with coupling K, said apparatus being fixed or mounted in direct connection with
the boiler and the combination of the apparatus A with an adjustable injector I for
supplying the said apparatus A with a mixture of feed water freed from magnesia,
and boiler water of fixed temperature so that all kinds of air and gases are driven
off, the carbonate of magnesia contained in such said water precipitated and the
water clarified before passing into the boiler substantially as described and shown.
2. The general construction arrangement and application of our improved
apparatus or any mere modification of the same substantially as described and
shown.