A Special Device for Preventing Incrustations upon the Furnace Plates of Tubular Boilers with Internal Furnaces.
Year: 1894

page_text: COMPLETE SPECIFICATION.
A Special Device for Preventing Incrustations upon the Furnace
Plates of Tubular Boilers with Internal Furnaces.
We, LA SOCIETE CHALIGNY ET CIE. of 21 Boulevard Poissonniere Paris in
the Republic of France 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:-
The invention which forms the subject of the present application consists in a
special device for preventing incrustations upon the furnace plates of tubular boilers
with internal furnaces.
This device is represented by the example shewn in the accompanying drawing
to which the following description refers and in which Figure 1 is a longitudinal
section, Figure 2 is a cross section, and Figure 3 a plan of a portable engine
provided with the device, according to this invention.
The said device comprises
1. An inlet cock A with a conduit inclined in a straight line which discharges
the feed water into the midst of the steam contained in the boiler in such a manner
that the water introduced is at the same time directed against the upper part of
the said boiler. This cock, which is easy to clean, is placed as near as possible to
the smoke box. Owing to the feeding of the water into the midst of the steam
contained in the boiler the deposits form instantaneously and in a pulverulent
state.
2. A metal screen B which being placed at the bottom of the cylindrical body
and in the rear of the firebox, forms in the lower portion of the said cylindrical
body a place for the pulverulent deposits or sediments to rest in, which collect
therein alter descending through the cylindrical body to the fire box.
Where our arrangement is applied to locomotive engines, the screen is of course
so placed as not to interfere with the water reaching the tube plates.
3. A mud-box C with a discharge cock for the daily removal of the mud,
situated at the lower part of the cylindrical body behind the collar or casing
connecting the cylindrical body with the casing of the firebox. This mud-box
made of steel and rivetted to the boiler, carries at its lower part an autoclave or
valve which may be opened against the internal pressure to discharge the mud and
which can be automatically securely closed by the internal pressure enabling it to
be cleaned when the discharge cock happens to be obstructed.
Where our arrangement is applied to locomotive engines, the mud-box may at
will be made of cast steel or sheet iron but should always be fitted with a cleaning
plug below and a nozzle on one side, capable of receiving, either directly or
through the medium of a suitable pipe, a discharge cock for the daily removal of
the mud.
Owing to this arrangement, pulverulent deposits are obtained, which are localized
and removed from the action of the heat in the lower part of the cylindrical

page_text: body such deposits being readily removed by daily discharges and periodical
washing..
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The arrangement above described and adapted, in tubular boilers with internal
furnaces, and notably in locomotive engines, to obviate incrustations upon the
furnace plates; such arrangement being characterized by the combined action of
the inlet cock A the screen B and the mud-box C, arranged and operated in the
manner described above with reference to the accompanying drawing representing
by way of example a specimen of the arrangement.
Dated this 26th day of July 1894.
JOHNSONS & WILLCOX,
Agents.