FIRE TUBE BOILER

CHAUDIERE A TUBES DE FUMEE

English Abstract

A fire tube boiler (10), comprising a jacket (11) for containing the water to be heated and a tube bundle designed to convey exhaust gases, which is accommodated within the jacket (11), the boiler comprising at least two furnaces (13, 14; 18, 19) with a corresponding burner (13a, 14a; 18a, 19a) connected to a single tube plate (15; 20) to which the tubes (16; 21) of the tube bundle are connected at one end, the tubes leading at their end into an exhaust gas collection chamber (17; 22).

French Abstract

Chaudière (10) à tubes de fumée comprenant une chemise (11) pour contenir l'eau à chauffer et un faisceau tubulaire conçu pour faire circuler des gaz d'échappement et qui est installé à l'intérieur de la chemise (11), la chaudière comprenant au moins deux générateurs de chaleur (13, 14; 18, 19) avec le brûleur correspondant (13a, 14a; 18a, 19a) reliés à une seule plaque tubulaire (15; 20)à laquelle les tubes (16; 21) du faisceau tubulaire sont fixés par une extrémité, ces tubes débouchant à leur autre extrémité dans une chambre (17; 22) de collecte des gaz d'échappement.

Claims

5
CLAIMS
1. A fire boiler (10), comprising a jacket (11) for containing the water to
be heated and a
tube bundle designed to convey exhaust gases, which is accommodated within
said jacket
(11), said boiler comprising exactly two furnaces (13, 14; 18, 19) with a
corresponding
burner (13a, 14a; 18a, 19a), each of said two furnaces (13, 14; 18, 19) being
connected to a
common single tube plate (15; 20) to which the tubes (16; 21) of said tube
bundle are
connected at one end, said tubes leading at their other end into an exhaust
gas collection
chamber (17; 22), characterized in that a portion of said jacket (11) is
arranged between the
burners (13a, 14a; 18a, 19a) of said at least two furnaces (13, 14; 18, 19).
2. The boiler according to claim 1, characterized in that said at least two
furnaces
(13, 14) are arranged side by side.
3. The boiler according to claim 1, characterized in that said at least two
furnaces
(18, 19) are arranged so that one lies above the other.

Description

CA 02806453 2013-01-24
WO 2012/013406 PCT/EP2011/059467
1
FIRE TUBE BOILER
Technical Field
The invention relates to a fire tube boiler.
Background art
It is known that the heat source of thermal systems that require high
power is often provided by means of a battery of fire tube boilers connected
in parallel.
In conditions of high heat demand, such battery operates optimally,
because all the boilers that compose it, conveniently balanced, are
operating, but when heat demand decreases, the burner of one or more
boilers is turned off: thus, the corresponding boiler remains unused, with all
the negative consequences that notoriously arise from the loss of continuity
of operation.
Disclosure of the invention
The aim of the present invention is to provide a fire tube boiler that
can be installed as a heat source in thermal systems requiring high
capacities, ensuring continuity of operation as the heat demand conditions
vary.
This aim and these and other objects which will become better
apparent hereinafter are achieved by a fire tube boiler, according to the
invention, characterized in that it comprises the features disclosed in the
appended claims.
Brief description of the drawings
Further characteristics and advantages of the invention will become
better apparent from the description of two preferred but not exclusive
embodiments of the fire tube boiler according to the invention, illustrated by
way of non-limiting example in the accompanying drawings, wherein:
Figures 1 and 2 are views of a battery of boilers connected in parallel
according to the background art, in two different operating conditions;
Figure 3 is a sectional view of the boiler according to the invention

CA 02806453 2013-01-24
WO 2012/013406 PCT/EP2011/059467
2
according to a first embodiment;
Figure 4 is a view of the boiler according to the invention according
to a second embodiment.
Ways of carrying out the invention
With reference to Figures 1 and 2, the reference numerals 1 and 2
designate two fire tube boilers according to the background art, which are
connected in parallel so as to form a battery.
The boilers 1 and 2 are identical, and therefore the boiler 1 comprises
a jacket 3 for containing the water 4 to be heated and is provided, at the
top,
with a furnace 5 in which the flame produced by a burner 6 develops.
The furnace 5 has a base shaped like a tube plate 7, from which a
plurality of tubes 8 extend; said tubes are immersed in the water 4 to be
heated and convey the exhaust gases produced in the furnace 5 to a chamber
9 for collection and conveyance to the stack.
The boiler 2, as mentioned, is identical to the boiler 1.
The situation shown in Figure 1 is the full-capacity situation: the
burner 6 of the boiler 1 and the corresponding burner of the boiler 2 are on,
as highlighted in the figure, and thus both boilers, balanced appropriately,
are operating and the situation is optimum.
Figure 2 instead shows the situation that occurs as a consequence of a
reduction in heat demand: the burner of the boiler 2 has shut down and
accordingly the entire boiler 2 remains unused.
Figure 3 is a view of a first embodiment 10 of a boiler according to
the invention which comprises a jacket 11, for containing the water 12 to be
heated, with connectors 11a, 1 lb respectively for inflow and outflow.
Inside the jacket 11 two furnaces 13 and 14 are provided, with
corresponding burners 13a, 14a, which have a common base constituted by
a tube plate 15, which is thus connected to both furnaces 13 and 14.
Tubes 16 of the tube bundle are connected to the tube plate 15, are
immersed in the water to be heated and convey the exhaust gases generated

3
in the two furnaces 13 and 14, or in at least one of them, to a chamber 17 for
collection and conveyance to the stack.
When only one of the burners is operating, as is the case in Figure 3,
in which only a burner 13a is on, the exhaust gases that it produces affect
all
the tubes of the tube bundle, according to the arrows in the figure, with
consequent full use of the boiler and with the additional advantageous
feature of achieving a great reduction in the temperature of the exhaust
gases in output, with consequent increase in efficiency, due to the large
exchange surface that is offered to the exhaust gases in the indicated
condition.
Figure 4 shows a second embodiment of the invention, in which two
furnaces 18 and 19, with respective burners 18a, I9a, instead of being side
by side as in the embodiment of Figure 3, are superimposed, but in any case
always both connected to a tube plate 20 to which tubes 21 of the tube
bundle are connected; such tubes are immersed in the water to be heated and
convey the exhaust gases produced in both furnaces, or in only one of them,
as is the case of Figure 4, in which only the burner 18a is on, with the flow
of exhaust gases highlighted by the arrows, to a collection chamber 22.
In practice it has been found that the boiler according to the invention
fully achieves the intended aim,
The described invention is susceptible of numerous other
modifications and variations, all of which are within the scope of the
appended claims: moreover, all the details may be replaced with other
technically equivalent elements.
Where technical features mentioned in any claim are followed by
reference signs, those reference signs have been included for the sole
purpose of increasing the intelligibility of the claims and accordingly such
CA 2806453 2017-11-01

CA 02806453 2013-01-24
WO 2012/013406 PCT/EP2011/059467
4
reference signs do not have any limiting effect on the interpretation of each
element identified by way of example by such reference signs.

Representative Drawing