Improvements in and connected with Flame-tube Boilers.
Year: 1895

page_text: Date of Application, 16th Nov., 1895
Complete Specification Left, 11th Aug., 1896-Accepted, 12th Sept., 1896
PROVISIONAT DE PITTORIA
Improvements in and connected with Flame-tube Boilers.
1, WILHELM SCHMIDT, of Ballenstedt on the Harz, in the Duchy of Anhalt,
German Empire, Civil Engineer, do hereby declare the uature of this invention
to be as follows: —
This invention refers to flame tube boilers, such as Cornwall-, Lancashire-,
Galloway-boilers and similar types, and my improvements in boilers of said sorts
relate to the combination of the flame-tube or -tubes with a superheater or super-
beaters, and with means for regulating the action of the fire-gases upon said
superheaters, as is fully described hereinafter.
I have shown one form of construction of my novel arrangement in the accom-
panying drawing, in which a is an annular body arranged within the flame-tube,
and dividing the space enclosed by the latter into a front chamber and a rear-
chamber; b is a horizontal cylinder arranged within the rear-chamber, concentrically
with the flame-tube, and forming thus with said tube an annular space c; this space:
receives the superheater d d', which in the form of construction shown consists, of
two series of coils arranged one within the other.
The cylinder b is firmly connected with a rod e extending outwards through the
rear wall of the masonry of the boiler, and having at its end a handle e. By
means of said rod the cylinder b may be longitudinally displaced, so as to lie either
with its front end against the annular body a (compare Fig. 2) or with its rear end
against the masonry wall afore mentioned (compare Fig. 1). If the cylinder 6 is in
the position shown in Fig. 1, the fire-gases will all be compelled to pass through
the annular space containing the superheater, and the steam passing through the
latter will thus be exposed to the action of said hot gases, i.e. will be superheated.
If, however, the cylinder bis in the position shown in Fig. 2, the fire-gases are all
compelled to pass through said cylinder, and cannot flow around the coils of the
superheater. The steam flowing through said coils becomes therefore not super-
heated, but is merely dried.
The cylinder 6 when in the position shown in Fig. 2 grows, as a matter of course,
rather hot, and it might seem, that the superheater although prevented from being
directly acted on by the fire-gases he yet exposed to a strong heat, so that the
steam flowing through the coils might yet be superheated. The superheater
although heated from one side is, however, cooled from the other side, i.e. from the
neighbouring portion of the flame-tube f, and the temperature existing in the space
containing the superheater is thus a medial one, provided, the cylinder b be in the
position shown in Fig. 2.
The cylinder 6 need not, as a matter of course, be either in the position shown in
Fig. 1 or in that shown in Fig. 2, but there may be intermediate positions, so that
the fire-gases low partly through the cylinder b and partly through the space
containing the superheater. The degree of superheating may thus be regulated
according to any requirement.
I wish it to be understood, that the superheater need not indispensably be formed
by just two series of coils; there may as well be employed but one series, or, if
desired, more than two. This depends partly on the diameter of the flame-tube,
partly on the diameter of the superheating pipe, and partly on the maximum degree
of superheating required. If employing more than one series of coils, I prefer to
let the wet steam enter first the inner or innermost series, so as to consume as much
as possible of the heat radiated by the regulating organ b. I have represented

page_text: such an arrangement in the form of construction shown. The wet steam flows
through the pipe g into the coils d', and enters thereafter in a dried state the coils d,
within which it is superlieated; the superheated steam is then led away to the
engine (not shown) through the pipe 7.
I wish it further to be understood, that the regulating organ need not indis-
pensably be formed by a cylinder, such as shown, but other mechanisms, such as
valves, slides, and the like, may as well be employed. The whole arrangenient
represented is merely to be regarded as an example.
Dated this 16th day of November 1895.
WILHELM SCHMIDT,
By Cassell & Co.,
22 Glasshouse Street, Regent Street, W., Agents for the Applicant.
Improvements in and connected with Flame-tube Boilers.
I, WILHELM SCHMIDT, of Ballenstedt on the Harz, in the Duchy of Anhalt,
German Empire, Civil 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 refers to flame tube boilers, such as Cornwall-, Lancashire,
Galloway-boilers and similar types, and my improvements in boilers of said sorts
relate to the combination of tlie flame-tube or -tubes with a superheater or super-
heaters, and with means for regulating the action of the fire-gases upon said
superbeaters, as is fully described hereinafter.
I have shown one form of construction of my novel arrangement in the drawing
sent in with provisional application, in which a is an annular body arranged within
the flame-tube, and dividing the space enclosed by the latter into a front chamber
and a rear-chamber; b.is a horizontal cylinder arranged within the rear-chamber,
concentrically with the flame-tube, and forming thus with said 'tube an annular
space c; this space receives the superheater dd, which in the form of construction
shown consists of two series of coils arranged one within the other.
The cylinder bis firmly connected with a rod e extending outwards through the
rear wall of the masonry of the boiler, and having at its end a handlo e. By
means of said rod the cylinder b may be longitudinally displaced, so as to lie either
with its front end against the, annular body a (compare Figure 2) or with its rear
end against the masonry wall afore mentioned (compare Figure 1). If the
cylinder bis in the position shown in Figure 1, the fire-gases will all be compelled
to pass through the annular space containing the superheater, and the steam passing
through the latter will thus be exposed to the action of said 'hot gases, i.e. will
be superheated. If, however, the cylinder b is in the position shown in Figure 2,
the fire-gases are all compelled to pass through said cylinder, and cannot flow
around the coils of the superheater. The steam flowing through said coils becomes
therefore not superheated, but is merely dried.
1
In
The cylinder when in the position shown in Figure 2 grows, as a matter of
course, rather hot, and 'it might seem, that the superheater although prevented from
being directly acted on by the fire-gases be yet exposed to a strong heat, so that
the steam flowing through the coils might yet be superheated. The superheater
although heated from one side is, however, cooled from the other side, i.e. from the
neighbouring portion of the lame-tube, aud the temperature existing in the space
containing the superheater is thus à mediul one, provided, the cylinder 6 be in the
position shown in Figure 2.
The cylinder b'need not, as a matter of course, be either in the position shown in
Figure 1, or in that shown in Figure 2, but there may be intermediate positions, 60

page_text: that the fire-gases flow partly through the cylinder b and partly through the space
containing the superheater. The degree of superheating may thus be regulated
according to any requirement.
I wish it to be understood, that the superheater need not indispensably be formed
by just two series of coils; there may as well be employed but one series, or, if
desired, more than two. This depends partly on the diameter of the flame-tube,
partly on the diameter of the superheating pipe, and partly on the maximum degree
of superheating required. If employing more than one series of coils, I prefer to
let the wet steam enter first the inner or innermost series, so as to consume as much
as possible of the heat radiated by the regulating organ b. I have ropresented
such an arrangement in the 'form of construction shown. The wet steam flows.
through the pipe g into the coils d', and enters thereafter in a dried state the coils d,
within which it is superheated; the superheated steam is then led away to the
engine (not shown) through the pipe h.
I wish it further to be understood, that the regulating organ need not indis-
pensably be formed by a cylinder, such as shown, but other mechanisms, such as
valves, slides, and the like, may as well be employed. The whole arrangement
represented is merely to be regarded as an example.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a flame-tube boiler, the combination with the flame-tube, of a superheater
arranged within said flame-tube; means for regulating the action of the fire-gases.
upon, and diverting them at will from, said superheater, for the purpose as
described.
2. In a flame-tube boiler, the combination with the flame-tube, of means for
forming an annular space within the same, and for regulating the flow of the fire-
gases through, and diverting them at will from, said annular space; a superheater
arranged within the said annular space, for the purpose as described.
3. In a flame-tube boiler, the combination with the flame-tube, of a superheater
consisting of a coiled pipe or pipes, and arranged within said flame-tube; moans
for regulating the action of the fire-gases upon said superheater, for the purpose as.
described.
4. In a flame-tube boiler, the combination with the flame-tube, of a superheater
consisting of two series of coils arranged one within the other in close proximity
to the wall of said flame-tube, and connected at their front-ends with each other;:
means for regulating the action of the fire-gases upon said superheater, for the
purpose as described.
5. In a flame-tube boiler, the combination with the flame-tube, of a superheater
consisting of a coiled pipe or pipes, and arranged within the flame-tube in close
proximity to the wall of the same; means for regulating the action of the fire-gases
upon said superheater, said means being arranged within said coils, for the purpose.
as described.
6. In a flame-tube boiler, the combination with the flame-tube, of a movable.
tube arranged axially within said flame-tube so as to form an annular space together
with the same; a superheater consisting of a coiled pipe or pipes and arranged
within said annular space; a perforated wall arranged in front of said movable.
tube; and means for moving the latter against, and withdrawing it from, said wall,.
for the purpose as described.
Buted
DUPXUAL LODU
Luten DIK ILI UBY UL ANUAL TOU
WILHELM. SCHMIDT,
By Cassell & Co.,
22 Glasshouse Street, Regent Street, London,.
Agents for the Applicant.