Improvements in Steam Generators.
Year: 1894

page_text: Date of Application, 20th Jan., 1894-Accepted, 10th Mar., 1894
COMPLETE SPECIFICATION.
[Communicated from abroad by JOHANN HEINRICH SCHRECK, of Hamburg,
Germany.]
Improvements in Steam Generators.
1, HAROLD IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, 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 :-
In all steam generators having a fire box and fire tube barrel connected thereto,
such as locomotives, marine boilers, and other boilers constructed according to the
locomotive type, the sides of the boiler readily become deteriorated under the
influence of the variations of temperature, and in particular with forced draught.
The part of the walls nearest the fire are most subject to this disadvantage, and
cause great difficulties in the working of this class of otherwise most advantageous
boilers.
According to the present invention these difficulties are obviated by constructing
the walls of the fire box of water tubes.
These water tubes can be combined in separate removeable groups in such
manner, that each group delivers its steam separately into the fire tube boiler of
ordinary construction or into a special receiver, from which the collected steam
passes directly either to the engine or other place of consumption, or into the
longitudinal fire tube barrel. Each of these groups of tubes can consist of one or
more long serpentine or otherwise coiled tubes.
On the accompanying drawings are shewn by way of example diagrammatic
sections of two constructions of such boilers.
Figs. I, II and III shew respectively a vertical longitudinal section and two
vertical cross sections of one construction, while
Figs. IV and V shew similar sections of another construction.
A is the fire box containing the water tubes, B is the longitudinal fire tube
barrel, C are a number of water tubes which are either formed into separate
systems or groups or constitute one complete removeable system forming the walls
of the fire box.
The group of tubes D forces the fire gases to pass through the upper group C,
to which they impart a portion of their heat, the tube plate of the barrel B being
thus protected against the effects of intense heat. The groups E of tubes form
the sides of the lower part of the fire box. Tubes J can serve to divide the fire
grate into two parts. As the arrangement of tubes shewn does not favour the
water circulation through them, this should be forced by pumping so as to clear
them of steam and effect suitable change of the water in them.
One advantage of the construction described is that the two parts A and B of
the boiler may be worked at different pressures. Thus A may supply the cylinder
jacket or dry the steam produced by B, or their different pressures may be other-
wise utilised.
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 :-
In steam generators having fire boxes, constructing such fire boxes with group
or systems of water tubes, which groups or systems can be separately or partially
inced that

page_text: they protect the tube plate of the fire tube boiler, employed in connection there-
with, from the excessive heat of the combustion gases, the steam being delivered
from the said groups or systems either separately or collectively into the fire tube
boiler, or separately or collectively to the steam engines or other places of
consumption, substantially as described.
Dated this 20th day of January 1894.
ABEL & IMRAY,
Agents for the Applicant.