Improvements in Cast-iron Sectional Boilers with Internal Firing.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in Cast-iron Sectional Boilers with Internal Firing.
I, OTTOCAR LINDEMANN, Engineer, 86 Queen Street, Cheapside E.C. 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 consists in the construction of a cast iron sectional boiler, of which
cach segment is a flat vessel with one or more openings through it. The segments
are so placed one above another, that the openings through the segments form a
receptacle for the fuel.
Figs. 1, 2 and 3 of the accompanying drawings represent a boiler of this
description.
a a are the segments shown as oval rings, bare the short pipes by which the
segments are connected together and through which the circulation of the water in
the rings is established and the escape of the steam generated is effected. The
rings as seen in plan may be of various shapes, but in order to avoid strains, the
round or oval form is best.
I prefer to place the segments in a sloping position in order that from the
beginning the circulation is established in the desired direction. In vertical section
the segments may be of various shapes but the form shown on the accompanying
drawings in which the upper and lower sides of the rings incline to the fuel shaft,
has the advantage that the lodgement of the fuel in the spaces between the.
segments is prevented. The surface of the segments in the direction in which the
hot gases travel to the flue can be made as large as advisable to extract the greatest
possible duty froin the fuel burned, and the surface of the rings affected by the heat
inay be increased by corrugations or gills.
The quantity of heat taken up can be controlled by the slide S 1 on the front, or
better, by the slide S at the back of the boiler. By raising or lowering this slide a
greater or less number of segments are exposed to the action of the flame or the hot
gases.
If the boiler be used for generating steam an extra cylindrical boiler W may be
placed above it, and this boiler may be partly or entirely surrounded by the
Hue gases.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :
1) The construction of a sectional boiler of segments placed one above another
and connected together by pipes, the segments having one or more openings
through them, which serve for containing the fuel as described.
2) The use in the construction of a boiler as described in Clause 1, of segments
whose upper surfaces slope to the filling shaft or furnace, so that the lodging of
fuel between the segments is prevented.
3) The use in the construction of a boiler as described in Clause 1, of segments,
whose upper and lower surfaces are widened in the direction in which the hot gases
from the furnace travel.
4) The use in the construction of a boiler as described in Clause 1, of a slide on
the front or back of the boiler, by which the number of segments exposed to the
heat of the fire is increased or diminished.
Dated this 22nd day of June 1891.
OTTOCAR LINDEMANN.