Improvements in or connected with Steam Generators, and Feed Water Heaters therefor.
Year: 1896

page_text: Date of Application, 4th July, 1896-Accepted, 3rd Oct., 1895
COMPLETE SPECIFICATION.
Improvements in or connected with Steam Generators, and Feed
Water Heaters therefor.
I, LOUIS MARIE GABRIEL DELAUNAY-BELLEVILLE of St. Denis in the
Republic of France Engineer do hereby declare the nature of my invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
In the Specification of my prior Patent No. 1729 dated 24th January 1895
I have described certain improvements in steam generators of the Belleville type,
in which the gases, after leaving the steam generating elements or tubes, flow
through a supplemental combustion chamber and thence pass to the feed water
heating elements or tubes.
The principal object of my present invention is the application of the aforesaid
combustion chamber to any arrangement of steam generator in which steam
generating and feed water heating elements or tubes are employed in combination.
I will refer to the feed water heating arrangement as the economizer.
The groups of tubes by which steam is generated and the groups of tubes by
which the feed water is heated are separated from each other by a space which
constitutes a combustion chamber into which air (preferably heated air) or steam,
or both, is or are introduced.
The economizer may be arranged in any suitable position relatively to the boiler
tubes, for example at the side thereof, or at the rear thereof, this constituting a
very satisfactory arrangement for torpedo or other boats; or the economizer may
be arranged beneath the boiler tubes, when the flues are beneath the furnace, or
when the economiser has otherwise to be placed at a lower level than that of the
boiler; or the economizer may be arranged at the end beneath the generators,
which is an arrangement especially applicable, for example, in the case of large
installations such as those at central electrical supply stations, or for sea-going
vessels, or in other cases where economy of ground space is important.
My invention solves a very important problem-viz. the application of economisers
and the necessary gas combustion chamber without increasing the ground space
occupied by the generators.
An arrangement according to my invention is shewn in sections at right angles
to each other in Figures 1 and 2 of the accompanying drawings, Figure 1 being
a section taken principally on the line - of Figure 2 and a portion of the left
hand side of which is shewn in section taken on the line of Figure 2, and
Figure 2 is a section taken on the line y-y of Figure 1. It includes inlets for
supplementary supplies of hot air into the combustion chamber to consume the
combustible gases therein. Four generators are shewn placed side by side as is
frequently the case with marine boilers, and each generator is furnished with its
economiser according to my invention.
Figures 3 and 4 respectively shew in longitudinal section and in plan an arrange-
ment in which the economiser is placed behind the generator.
Figures 5 and 6 shew similar views of an arrangement in which the economiser
is placed at the side of the generator and
Figures 7 and 8 respectively shew in longitudinal section and front elevation
an arrangement in which the economiser is placed beneath the generator.
The arrangement of economisers given by way of example and shewn in
Figures 1 and 2 is applicable to a group of any number of generators, whether

page_text: placed side by side or not, since each generator has its corresponding combustion
chamber and an economiser placed above.
In these Figures 1 and 2 A represents the shell or envelope of the boilers, a are
the outer casings of the generators and a¹ are the partitions between the individual
generators.
B is the connection with the smoke conduits or funnel and C are the fire
grates.
D are the tubes of the generators, and E are the tubes of the economisers
through which the feed water passes, and in which, it is heated on its way to the
generators. This water may be passed by the force pumps from top to bottom
or from bottom to top or in any other manner convenient for the installation.
FFF are. chambers for the mixing and combustion, of the gases between the
generator tubes and those of the economiser. There is such, a chamber. for each
generator, separated from the others by the partitions f¹ f¹.
GGG are pipes for the admission of hot air to the said chambers. This air is
induced by the draught, and enters at the bottom of the partitions or walls a¹a a
of the generators through orifices ggg, horizontal partitions or baffle plates hhh
causing the said air to pass backwards and forwards in contact, with, and be heated
by, contact with the walls of the furnace chambers near the generator tubes. The
hot air then enters the chamber K which extends over the whole width, of the
generator behind the sediment collectors L.,
The pipes G G G G are mounted on the inner wall of the chamber K and are
inclined in order that the air may be directed almost at right angles to the gases
which issue from between the generator tubes and which all pass, over the
obturator or baffle plate M. This arrangement facilitates, the mixing of the gases
and the hot air.
N. N. N. are pipes for the injection of air or steam, but preferably, air for ships,
in order not to lose fresh, air. These pipes N are placed directly above the
pipes G. G. G. and may be placed in the axes of the pipes G so as to make. them
assist in the introduction of the hot air into the combustion chamber. The air.
should be supplied to the combustion chambers at a pressure,such as to penetrate.
the gases with sufficient force and strongly stit them up and force them, towards
the angles ff of the combustion chambers and produce, eddies by means of
which the combustible gases are brought, into intimate contact with the oxygen of
the hot air introduced through the pipes G G and the said gases are burnt and, the
heat developed is very efficiently utilised by the economiser.
Having now particularly described and ascertained the nature of this iuven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In steam generators the combination of an economizer, and a supplemental gas,
combustion chamber situated between the generator tubes and the economizer tubes
and means for supplying air to the said combustion chamber substantially as
herein before described and illustrated by the examples given in the accompanying
drawings.
Dated this 4th day of July 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.