An Improved Process of and Apparatus for Preventing the Incrustation in Boilers.
Year: 1896

page_text: Date of Application, 20th Apr., 1896-Accepted, 29th Aug., 1896
COMPLETE SPECIFICATION.
An Improved Process of and Apparatus for Preventing the
Incrustation in Boilers.
We, JOSEPII GEORGE NASII, of Hindmarsh Square Adelaide, Engineer, and
JOHN MITCHELL BORROW, of Hutt Street Adelaide, Agent, both in the
Province of South Australia, do hereby declare the nature of this invention and
in what manner the same is to bo performed, to be particularly described and
ascertained in and by the following statement :-
The object of this invention is to prevent the incrustation in boilers in which
the operations of boiling or condensation are conducted.
Heretofore in such operations the fire has been permitted to play direct from the
firebox upon the surface of the condenser, or ordinary boiler of the Cornish,.
Lancashire or other well known type; or the heat is transmitted through tubes or
flues when tubular boilers have been used, so as to directly heat the solution under
treatment. In all of such cases the sediment or precipitate of the solution is
deposited on to the inner surface of the boiler in a solid form as an incrustation,
which wo seek to avoid.
Our invention consists first in the construction of such boilers with a jacket or
outer casing, between the firebox and boiler, either around the flues or firebox of
those boilers now ordinarily used, or to the tubes of such tubular boilers, or to
the boiler of the condensers when these are to be used. And second in the use of
glycerine or its chemical equivalent (either alone or with tho addition of water) or
of pure water under pressure or of steam in such jacket or outer casing during the
boiling operation. This jacket or coating of glycerine or glycerine solution or of
water or steam thus acts during the operation as a permanent jacket or coating to
the boiler, and in all cases surrounds the sides or surface; or that portion of the
boiler which is under the influence of the fire or heat.
We find that the effect of such a permanent jacket or coating of glycerine or
glycerine solution or of pure water or steam, is to cause the sediment or precipitate
of the boiling solution to remain in solution, in which form it can be readily drawn
through a vent or other means when the operation has been carried sufficiently far,
or it will be as a loose sediment if the solution is evaporated to its fullest extent,
and can then be blown off, but in no case will it be crystallised or adhere as an
incrustation to the sides or inner surface of the boiler. No chipping is therefore
required to remove it, as is the case with the boilers now in use, whilst from the
protection from the fire which the jacket or casing affords, the life of the boiler is
materially prolonged to that which has hitherto been attained.
The glycerine or glycerino solution or water or steam may be passed into the
jacket or casing by any convenient means, and will be evaporated at its surface
during the operation. The quantity of the solution or liquid or steam may there-
fore be made up by an addition of water or glycerine or steam to the jacket as the
operation is being conducted.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, wo declare that what
we claim is :-
First. The construction of boilers such as those described with a jacket or
outer casing to the firebox or flues, substantially as described and for the purpose
indicated

page_text: Second. The use of glycerine (either alone or with the addition of water), or of
water under pressure or of steam in boilers having a jacket or outer casing to the
firebox or flues, substantially as herein described and explained and for the purpose
indicated.
1000
BOULT & WADE,
Agents for the Applicants.