Year: 1898

page_text: I, JAMES YATE JOHNSON, of 47, Lincoln's Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been
communicated to me from abroad by Société Anonyme du Temple, of 39, Rue
de Paris, Cherbourg, in the Republic of France,) to be as follows:-
د,
The object of this invention is to provide in what are known as Temple'
return-flame boilers a more sharply defined combustion chamber than that possessed
by the types of boilers now existing.
In an arrangement according to this invention there is erected between the
furnace and combustion chamber a partition or party wall having a central perfora-
tion and extending between the clusters of tubes at each side so that the conibustion
chamber is constituted by the end of the boiler the partition and the lower dead
plate. These three surfaces are made of fire proof materials, capable of storing
heat and the radiating arrangement of which assists in combining the gases that
burn with those capable of being burnt. In order to retain the partition in place
it may be placed between tubes which will form a species of rigid network or grille
on either side of the said partition.
Thus a very satisfactory combustion chamber is obtained wherein a thorough
mixture of the gases is ensured owing to the contraction which the current of
products of combustion undergoes at the opening through the partition followed
by their sudden expansion; and the change in the direction of such current which
takes place at the entrance of the series or cluster of tubes. Jets of air may be
injected through holes in the dead plate, at right angles to the direction of the main
air supply.
This arrangement complies with the principal requirements well enough but it
increases the depth of the boiler by the whole of the space occupied by the combustion
chamber. To obviate this the combustion chamber can be comprised between the
ends of the boiler and at each side two partitions be formed of tubes one of the
partitions having its tubes placed close together from the front to a short distance
from the back where the tubes have spaces between them and the other partition
extending from the back to near the front and consisting of tubes set close
together.
In this arrangement the benefit of fire resisting walls is lost: but on the other
hand the tubes between which the gases pass between the two partitions efficiently
act in heating.

page_text: COMPLETE SPECIFICATION.
Improvements in Water-tube Steam Generators.
I, JAMES YATE JOHNSON, of 47, Lincoln's Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been
communicated to me from abroad by the Société Anonyme du Temple, of 39, Rue
de Paris, Cherbourg, in the Republic of France,) and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
"
The object of this invention is to provide in what are known as Temple
return-flame boilers a more sharply defined combustion chamber than that possessed
by the types of boilers now existing.
This invention will be best understood by reference to the accompanying
drawings in which :-
Figure 1 is a vertical half section of an arrangement the adoption of which is
suggested whenever feasible;
Figure 2 is a horizontal section thereof on the line 1-2 Fig. 1;
Figure 3 is a vertical half section of a modified construction; and
Figure 4 is a transverse section of the same on the line 3-4 Fig. 3.
In these figures, F is the furnace, T the series or cluster of tubes, and C the
combustion chamber. In the arrangement shewn in Figures 1 and 2 there is
erected at MN between the furnace and combustion chamber a partition or party
wall having a central perforation at 0 and extending between the clusters of
tubes at each side, so that the combustion chamber C is constituted by the end of
the boiler AR the partition MN, and the lower dead plate. These three surfaces
made as far as practicable of fire proof materials, capable of storing heat and the
radiating arrangement of which assists in combining the gases that burn with those
capable of being burnt. In order to retain the partition MN in place it may be
placed between tubes such as t, t, t, which will form a species of rigid network or
grille on either side of the said partition.
Thus a very satisfactory combustion chamber is obtained wherein a thorough
mixture of the gases is ensured owing to the contraction which the current of
products of combustion undergoes at the opening 0, followed by their sudden
expansion, and the change in the direction of such current which takes place at
the entrance of the series or cluster of tubes.
Jets of air may be injected through holes a a¹ in the dead plate, at right angles
to the direction of the main air supply.
This arrangement complies with the principal requirements sufficiently well;
but it increases the depth of the boiler by the whole of the space occupied by the
combustion chamber. To obviate this the arrangement represented in Figures 3
and 4 may be employed.
The combustion chamber C is shewn comprised between the ends and AR of
the boiler and at each side of the two partitions are formed of tubes, one of the
partitions M N having its tubes placed close together from the front to a short
distance from the back at OP where the tubes have spaces between
them and the other partition QR extending from the back to near the front and
consisting of tubes set close together.
In this arrangement the benefit of fire resisting walls is lost; but on the other
hand the tubes PM between which the gases pass to between the two partitions
efficiently act in heating and mixing the gases.

page_text: Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is
-
1. In a return-flame water-tube steam boiler a combustion chamber formed by a
partition parallel or nearly parallel to the rear wall of the boiler, such partition
having an aperture provided at its central part for the purpose of throttling the
current of the products of combustion and the walls of such chamber being as
far as practicable formed of fire-resisting materials to facilitate the reignition of
the combustible gases by contact with the burning gases substantially as herein-
before described and illustrated in Figures 1 and 2 of the accompanying drawings.
2. In the arrangement claimed in the preceding claim, supporting the wall or
partition containing the central aperture by tubes arranged on either side thereof,
substantially as hereinbefore described and illustrated in Figures 1 and 2 of the
accompanying drawings.
3. In the arrangement claimed in the preceding claims, injecting air currents
into the combustion chamber through suitable perforations opening into the said.
chamber, substantially as hereinbefore described and illustrated in Figures 1 and 2
of the accompanying drawings.
4. In a return-flame water-tube boiler a combustion chamber formed by parallel
or nearly parallel partitions made up of close fitting tubes, and so arranged as to
cause the
gas currents in their passage to twice reverse their course substantially
as hereinbefore described and illustrated in Figures 3 and 4 of the accompanying
drawings.
5. In the arrangement claimed in the preceding Fourth Claim, placing the furnace
in communication with the combustion chamber by arranging the tubes for a
certain distance at intervals apart so as to assist in heating and mixing the gases,
substantially as hereinabove described and illustrated in Figures 3 and 4 of the
accompanying drawings.
Toted this 14th of t... 1900
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.