An Improved Composition for the Prevention of Inorustation in Boilers.
Year: 1894

page_text: Date of Application, 9th Oct., 1894-Accepted, 10th Nov., 1894
COMPLETE SPECIFICATION.
An Improved Composition for the Prevention of Inorustation
in Boilers.
I GEORGES LOUIS FELIX EDELINE, of 4 Impasse Gaumont, Rouen, in the
Republic of France,. Tanner, 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 relates to the preparation and composition of a substance to be
used for the destruction or prevention of calcareous incrustations in boilers,
particularly in those used for the generation of steam.
Amongst the substances at present in use, some attack the metal plates of the
boiler, and clean them in such a manner that the tightness of the rivets is impaired.
Others form émulsions with the water, and cause the passing over or priming of
the water, and other matters with the steam, to the great injury of the steam
engines supplied from the boiler. Others are costly, and are difficult in their
employment, so that they are eventually discarded. My improved composition does
not in any way attack or deteriorate metals, and does not provoke "priming," and is
not carried over in any degree with the steam. The condensed steam does not
contain any trace of it.
Its effect is to detach the calcareous deposit or tartar from the iron. Like a
worm under the bark of a tree, it forces itself irresistibly between the plate and the
fur, and causes the latter to fall in loose pieces to the bottom of the boiler, from
whence it can be removed by the usual blow-off. It forms also upon the plates a
light layer of powder, which prevents all subsequent deposit of fur.
The employment of my composition is very easy. It may be introduced in solid
form through the manhole if desired, or may be fed in a liquid form with the feed
water in which it completely dissolves in all proportions.
Once the composition is inserted into the boiler it remains there, and carries out
its effect without further addition, until the next blowing off of the contents of
the boiler.
The quantity of composition to be employed is very small, viz.: about 1 to
2 kilogrammes for 10 square metres, or 107-64 square feet of heating surface, and
according to the quality or hardness of the feed water used. My composition is
composed of the following materials:-
Ist. Tan waste liquor which has been exhausted.
2nd. Oak wood triturated.
3rd. Log-wood triturated.
4th. Carbonate of soda (NaO,CO,).
The proportions of the above constituents and the mode of preparation are as
follows:-
I introduce into a closed pot or digestor of iron
350 kilogrammes of triturated oak wood
200 kilogrammes of triturated log-wood and
500 litres of exhausted tan waste liquor.
I heat this mixture by means of an appliance, as used for the diffusion of sugar,
with steam jets, and I raise the interior pressure to 1-500 kilogrammes per square
contimetre which is equal to 21.33 lbs.
wood to be digested for two hours per sq. inch. At this pressure I leave the
then clarify the liquid which when cool

page_text: A second operation is then made and a second, extract obtained, which marks
about 0°.4 to 0°.6 and is put on one side to serve in a subsequent operation to soak
new wood, but always mixed with waste tanning liquor.
The above liquor marking 2°.4 to 20:8 is withdrawn by a pump, and is introduced
into a rectangular back, where operates an evaporating lenticular apparatus, heated
both by a direct supply of steam, and by the exhaust steam, which serves to actuate
the apparatus.
The object of this operation is to concentrate the product, and to bring it from
a density of 2°.4 to 35° to 40°. This product is again cooled in its receptacles,
and after cooling, the product marks a density of 45° to 50°; and has the form of
a syrup. I then mix it, whilst kueading it strongly, with carbonate of soda of a
weight equal to a third of that of the liquor. It becomes momentarily liquid I
pour it then into moulds, and after some instants of rest, I obtain a ‘briquette, solid;
but absolutely soluble in water.
:
I can prepare also the same product in a liquid form. To effect this, the
operations are the same as before recited, except that I mix the carbonate of soda
with the product when withdrawn hot from the evaporator. The dissolving of
the syrup is thus complete, and the liquor remains: fluid, its chemical composition
being the same as that of the solid product.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1 2
1st. The composition of a disincrustant for boilers or similar vessels, comprising
triturated oak-wood; triturated log-wood, waste and exhausted tanning liquor, and
carbonate of soda in preferably the relative proportions substantially as herein
specified.
2nd. The process for the manufacture of the said disincrustant in a solid form
consisting of the digestion of triturated wood fibres in waste-tanning-liquor. under
a steam pressure of about 1.5 kilogrammes, per square centimetre (or about 20 lbs.
per square inch) the concentration by evaporation of the liquor obtained to the
consistency of a syrup, the cooling thereof, the mixing therewith of carbonate of
soda, the pouring into moulds when liquid, and the cooling of the contents of the
moulds into solid briquettes, substantially as herein'described.
3rd. The equivalent, but alternative process for the production of the disincrustant
in a liquid form, consisting of the permanent dissolution of the syrup when hot,
after evaporation for concentration, by the admixture there with of carbonate of
soda, substantially as herein described.
Dated this 9th day of October 1894.
FELL & WILDING,
1, Queen Victoria Street, London, E.C., Agents for the Applicant.