Year: 1898

page_text: "
Date of Application, 29th Dec., 1898
Complete Specification Left, 29th Sept., 1899-Accepted, 25th Nov., 1899
I, CHARLI'S GROLL, of 126, Rue du Grand Chemin, Roubaix (Departement du
Nord), in the Republic of Fiance, Engineer, do hereby declare the nature of this
invention to be as follows
My invention relates to a water-tube steam generator, characterised by the
novel arrangement of the upper and lower collectors and of the water-tubes wluch
connect thein for the purpose of obtaining a large vapor 18ing surface with a
small volume, and at the same time a forced on intense circulation and vapon 18a-
tion A further object of my invention is the combination of a feed-water heater
with the upper collector
The
The generator comprises a lower collector having the form of an annulai
horizontal crown which may be either cucular or poligonal and of encular,
rectangular or other cross-section; this crown may be in one or more parts.
Along the axis of this collector and above the same is aanged a second collector
having the form of a vertical cylinder terminated by spherical caps on ends
two collectors are connected by an assemblage of tubes of small diameter the
extremities of which are aanged in concentie 1ows upon the lower collector
and in super posed concentric lows upon the upper collector; each lower low
coesponds to several upper rows in order to enable the grouping of a very large
number of tubes within a small compass
The two collectors are also connected by one or more large water retuin tubes.
The generator is heated by a circulai grate formed within the lower collector.
The combustion gases ciculate through the assemblage of tubes, which are
formed with several partitions constituting baffles which may be formed by the
Junction of tubes
Before reaching the chimney these gases pass into a feed-water heater in the
form of a multiple coil arranged concentrically with the upper collector This
heater is constituted by a series of superposed elements each of which is formed
by a certain number of tubes concentric with the upper collector, which tubes
are connected at their extremities with a horizontal water supply collector and
with a horizontal water escape collector, the escape collector of each element
being connected with the admission collector of the following element, in such
a manner that the feed water introduced at the base of the heater, 11ses in
following a helical path through all the elements
The water enters the upper
collector of the generator through one or more pipes which are arranged in such
a manner that the admission of hot water does not impede the circulation within
the generator

page_text: гарготощощею 14
I, CHARLLS GROLL, of 126, Rue du Grand Chemin, Roubaix (Departement du
Noid), in the Republic of Fiance, Engineer, 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 --
This invention relates to a water tube steam generator having a laige vaporising
surface and operating with a relatively small quantity of water, and in which
an extremely iapid cuculation and very active vaporisation are obtained by the
special arrangement of upper and lower collectors in combination with the heating
tubes and the water return tubes. This generator is also characterised by the
combination of a feed-water heater of novel construction with the uppei collector
of the boiler which 18 specially arranged for this purpose.
In principle the generator comprises two collectors al langed concentrically one
above the other; the fist, which is cylindrical, being arranged vertically, in the
centie, whilst the other which is of annular or polygonal form, and in one or more
paits, is installed below the first and around the furnace These collectors are
The
in communication by means of suitably bent tubes the assemblage of which forms
a bundle of tubes which is approximately conical in shape, within which is
situated the combustion chamber of the furnace, the grate, which may be either
1otary or fixed, 18 a11anged in the space within the annular collector.
bundles of tubes are arranged in such a manner as to form one or more passages
presenting baffles for the combustion gases, thus ensuring complete utilisation
of the heat. The upper collector is also in communication with the second
collector by one or more water return tubes of lange diameter which serve to
establish an extremely rapid circulation throughout the generator. This upper
collector of vertical cylinducal form is surrounded by a feed water heater of
novel construction, the novel features which it presents enabling it to greatly
increase the thermic effect of the generator without necessitating the employment
of more space either in plan or elevation.
In the accompanying diawing I have represented several forms of generator
ananged in accordance with my invention
Figure 1 is a vertical section upon the axis of a generator the lower collector
of which is in the form of a torus, whilst the upper collector 18 combined with
a feed water heater
Figure 2 is a horizontal section taken upon the line 1-2 of Figure 1
Figure 3 is a plan view showing the upper collector and the feed water heater.
In the following figures I have not repiesented either the outer casing of the
generator or the feed water heater which retain the same form in the different
modifications
Figure 4 shows a modified arrangement with an annular lower collector having
a rectangular cross-section.
Figure 5 is a horizontal section taken upon the line 31 of Figure 4.
Figures and relate to a modification with water return tubes arranged
within the bundle of small tubes, and
Figures 8 and 9 relate to a modification with the lower collector composed of
four independent boilers aanged in accordance with the sides of a square.
It will be apparent from the diawing that my generator is capable of numerous
modifications without departing from the principle of construction above
enunciated I will now describe my invention more particularly with reference
to Figures 1 to 5.
In this arrangement the lower collector presents the form of a torus having a

page_text: vertical axis
The upper collector is a vertical cylinder terminated by hemis-
pherical parts; its axis forms a prolongation of that of the torus a
From the upper portion of the lower collector a starts a series of water tubes
of small diameter terminating around the entue cucumference of the vertical
evlindical collector From the bottom of this collector descends a tube d
of large diameter intended to conduct the water back into the lower collector by
means of a certain number of radiating pipes y connecting the discharge collector ¿,
situated below the vertical tube d, with various points of the clown a The water
return tube & passes through the rotating giate f and forms an axis for this
latter around which it rotates with either a continuous or intermittent movement.
In order to permit of access to this giate for charging and inspection, the
distribution of the tubes is interupted upon a portion of the lower collector,
as indicated in the diawing, (Figure 2), between the adura Access to the rear
of the ash pit not being always possible, the metal sheeting of this latter may be
made capable of 1otating in order to iende cleaning out by means of a single
aperture practicable.
The vertical arrangement of the upper collector enables its entire circum-
ference to be utilised for the inception of the tubes coming from the lower
collecto The tubes starting from the upper portion of the lower collector form
a certain number of circular 10ws Each of these tows terminates at the upper
collector according to two three or four adjacent cncumferences In thus mannel
I succeed in ananging a considerable number of tube extremities upon the upper
collector whilst making this latter scarcely one half the volume which would be
necessary if it were horizontal. An essential characteristic of this invention
resides in this special arrangement of the extremities of the water tubes, which
enables a maximum of heating surface to be obtained with a collector of given
dimensions, and also in the vertical position of the collector above the centre of
the generator, thereby effecting a notable reduction in volume and weight such as
could not be obtained with a collector of different form and position
This
The level of the water may be either above or below the upper cucle of water
tubes b, passing through all the tubes when the generator is operative
anangement ienders it possible, when the generator is shut down, to place it
in a state of conservation by filling all the tubes without its being possible for a
noxious au chamber to remain The tubes corresponding to the lower cucle
of the upper collector are bent in such a manner that they enable a cucular layer
of bucks P to be supported, protecting in the most efficaceous manner the vetting
of the cylindical body and the cential tube
Towards the middle of the bundle of tubes b there 18 a circular range of tubes
extending like the others from the lower collector to the top collector but they
are successively in intimate contact by their adjacent walls from the lower
portion to a certain distance towards the upper collector These joining tubes thus
constitute a partition or wall, indicated in the diawings by section lines, formed
at the interior of the cluster of tubes for the greatest portion of their height
The external circulai 1ange 18 simularly formed by the tubes which are in
intimate contact with each other at then adjacent sides from their base to the
upper collector and over the greatest portion of their length, the said tubes
separating from each other before reaching the lower collector when in tuin they
constitute a plain uninterrupted surface or partition A¹.
As a result of this arrangement the cuculation of the gases 18 as follows: The
flames spread through the combustion chamber formed by the space within the
tubular bundle; the gases strike transversely the series of rows of tubes situated
within the first junction paitition k. The intensity of vaporisation of this direct
heating surface is consequently very great The gases then pass above the
partition still stuking the tubes tiansveisely and this takes place around the
whole of the upper cylindrical body From this point the gases follow the tubes
longitudinally and in a duection which is inverse to that of the water descending
into the annular space formed by the two junction partitions & and . They pass
across the external partition ¹ at its lower portion and then use into the flue m.

page_text: In order that a great portion of the heat which the gases carry with them may
be utilised, cause them to pass through the cicula tubes for heating the feed
water which are arranged for this purpose around the collector at its upper
portion, before they reach the flue
,
The feed water heater (Figures 1 and 3) is constituted by a series of superposed
elements consisting of concentric tubes n The extremities of the different tubes
of each element teiminate at two horizontal collectors and arranged normally
to the collector c; the outlet collector of one element communicates, by means
of a tube n¹ passing to the exterior of the metal sheets enclosing the generator,
with the admission collector of the following element, in such a manner that
the water entering at the lower portion of the feed water heater mounts spally
in the tubes n, passes as it becomes heated through all the elements and all the
collectors and is conducted from the last collector to the upper cylindrical body c
and then passes out vertically through a tube either into the steam or at the
in
the cential tube d such 8 manner as not to
upper portion of
impede the movement of circulation of the water in the generator; the descending
cuiient issuing from the tube 1, tends, on the contrary, to accelerate the move-
ment of netuin of the water in the cential tube d
The encular pipes are attached to the collectors by
provided with a double thread
means of unga n³
I have indicated in Figure 2 a second sheet metal casing leaving between it
and the casing the requisite space for enabling the au intended to support
combustion to pass, for the double purpose of heating this air and of preventing
the temperature of the heating chambei fiom being raised too greatly.
Having thus described the constitution of the generator I will now explain the
manner in which the water circulates The inner rows of tubes being those
which are first heated to a certam intensity, the water which they contain will
rise into the upper collector and will return to the lower collector by way of the
cential tube. This latter being situated 1ight in the middle of the fninace will
also be heated, but the water which it encloses being divided to a less degree
.will absorb less caloric than that which is contained in the small tubes, and
consequently this central tube will not modify the direction of the enculation,
as above indicated
In Figures 6 and 7 I have represented a generator constituted like that above
described generally speaking, but of which the water return tubes dare allanged
within the bundle of small tubes b, for example behind the first partition of
junction tubes, in order to prevent their being heated too directly. It is also
possible to sui round them with a series of small closed tubes or tubes which are
almost closed, in order to prevent excessive heating such as would be adapted to
prejudicially affect the water jetuin In addition to this in order to facilitate
this return, I continue the pipes within the upper collector by means of
extremities cut honzontally into a whistle shaped form. As a result of this,
the water, in entering the pipes is not impeded by the liberation of vapour
from the tubes b which open below them
In the same manner, in order to prevent the ascending movement of the water
from being impeded around the fall pipes d', I prolong these latter to a certain
extent within the lower collector
The fact that in this arrangement the cential water return is dispensed with
permits of the employment of either a rotating grate charged automatically or
otherwise, or a fixed coal or petroleum giate.
In Figures 8 and 9 I have represented a modification of my invention in which
the lower collector is formed by means of four independent boilers at al aanged
according to the sides of a square in such a manner as to permit of inspection
at one extremity
This arrangement is mentioned more by way of explanation than for its
practical importance, because the numerous differences of form and length of the

page_text: tubes would render their mounting very costly, and for this reason
collectors of annular shape
prefer
It will of course be understood that I do not limit myself to the arrangements
epresented in the diawing, which are given only as an example of the various
modifications of which my invention 18 capable, and that I reserve the right to
give to the various constituent parts of the generator any dimensions and forms
which are compatible with the principle of my invention
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim 18:
1 A water tube steam generator comprising in combination an upper vertical
cylindrical boiler, a lower annulai boiler, a tube serving for the return of the
water from the upper to the lower boiler, a feed-water heater presenting a laige
surface and of which the circulation is helicoidal, arranged around the upper
collector, and a giate situated within the cential space of the annular collector
2. In a steam generator in accordance with Claim 1, in combination with
the upper collector, a feed-water heater consisting of a series of superposed
elements each of which is formed by a certain number of tubes concentric with the
said collector, connected at then extremities with a horizontal collector for the
admission of water and with a horizontal collector for the discharge of water,
the discharge collector of each element being connected with the admission
collector of the element arranged above, the last discharge collector being provided
with a supply tube entering the upper collector of the generator.
3 A water tube steam generator in accordance with Claim 1, comprising in
combination, a vertical cylindical upper boiler, an annular lower boiler, a series
of heating tubes connecting the said boilers with a central water return tube of
large diameter, a feed-water heater airanged around the upper collector and a
1otating giate movable around a central tube of large diameter
4. A water tube steam generator in accordance with Claim 1, in which the
water return takes place by means of two or more tubes of large diameter situated
in the midst of the heating tubes and protected by any suitable means against the
direct action of the flames
5. In a water tube steam generator in accordance with Claim 1, a lower collector
of annular form and of rectangular cross-section
6. In a water tube steam generator in accordance with Claim 1, a lower
collector formed by several independent boilers aanged in accordance with the
sides of a regular polygon in such a manner that one extremity of each of them
18 accessible for cleansing purposes.
Dated the 29th day of Santambor 1800
HASELTINE, LAKE & Co..
45, Southampton Buildings, London, W.C, Agents for the Applicant.