Improvements in Steam-boilers with Superheater.
Year: 1895

page_text: Date of Application, 7th May, 1895
Complete Specification Left, 7th Feb., 1896-Accepted; 7th Mar., 1596
PROVISIONAL SPECIFICATION
Improvements in Steam-boilers with Superheater.
I, WILHELM SCHMIDT, of Ballenstedt near The Harz, in the Duchy of Anhalt,
German Empire, Civil Engineer do hereby declare the nature of this invention to
be as follows.—
This invention refers to steam-boilers that are combined with a superheater
heated by the waste-gases of the furnace of the respective boiler; my improve-
ments in boilers of said kind relate to the combination of the superheater with a
boiler having vertical heating tubes, and connected with a reservoir adapted to
The purpose of my
keep said boiler constantly perfectly filled with water.
improvements is to make boilers of said kind apt for said combination by
preventing the vertical heating tubes of the boiler from being destroyed by the
strong heat requisite for effecting a high superheating of the steam, and I, attain
that pmpose by combining the said boiler with a reservoir constantly keeping said
tubes in the whole of their length surrounded by water, instead of by water and
steam, as in the heating-tube boilers known up to now.
In order to make my invention more clear, I refer to the accompanying drawing,
in which similar letters refer to similar parts throughout the different views, and in
which:
Fig. 118 a vertical section through my improved steam-generator.
Fig. 2 is a similar section through a modified form of construction,
Fig 3 18 a horizontal section taken on line 5-6 of Fig 1, and
Fig. 4 19 a horizontal section taken on line 7-8 of Fig. 2.
Refering to Fig. 1, a is the boiler, and a' the heating-tubes of the same; said
tubes are manged around a laige central flue extending upwards from the
furnace b, said flue may partly or wholly be closed by a lid or cover 62. The
boiler a is connected by means of the pipes cc' with a resei voir d, which is kept
filled with water up to such a height, that the level of the water is constantly
higher than the upper ends of the heating-tubes al; the latter are, therefore,
constantly Burrounded by water throughout their whole length.
The superheater e consists in the mode of construction shown of a column of
borizontal coils arranged above the boiler a, and between an outer casing fand no
inner casing, one end of said superheater is connected with the dome of the
reservoir. The steam escaping from the latter, and flowing through the coils of
the superheater e, is superheated by the furnace-gases passing either through the
heating-tubes a' only, or through the flue b', too. If the latter is closed by the
lid or cover 2, the re-gases will be comparatively much exhausted by the large
area of surface offered by the heating-tubes, and the degree of superheating will,
thus, be less than if a smaller or greater portion of said gases is allowed to escape
through the flue '. There is, thus, afforded thereby a means of regulating the
degree of superheating of the steam.
Instead of employing a vertical reservoir, I may use a horizontal one, as shown
as an example in Fig. 2. There is in this case but one connecting-pipe between
said reservou and the boiler, but, as a matter of course, two may be used. The
large central flue is replaced by heating-tubes, and the lid or cover is enlarged, and
provided with projections 63 adapted to close the greatest part of said tubes.
There 18, thus, gained the same effect, as described with regard to the mode of
construction first described.

page_text: 1
The comical cover 2 (Fig. 1) or the flat cover 3 (Fig. 2) may, as a matter of
course, be replaced by any other equivalent device, for instance by a flap, a
rotatable disk provided with openings, or the like
If a large, central flue is employed as in Fig. 1, I prefer to contract within the
upper portion of the fire-box the way for the fire-gases by arranging within said
portion two horizontal boiler-tubes ag' (Fig 3) supporting four plates 12 h3 h4;
the latter cover the greatest part of the horizontal area of the fire-box, leaving
only a channel situated directly below the flue b. The fire-gases are thus
brought into intimate contact with the flames, and will rush wholly or partly
directly into the flute & as soon as the lid 62 13 more or less raised The lid b2
or 3 respectively, may be operated by a hand-lever & connected to said lid by a
rod P.
The form of construction of the reservoir shown in Fig 1 may well be used for
purifying the feed-water for the boiler proper; for this purpose I arrange within
said reservoir a tube / having at its top a funnell, and terminating shortly above
the bottom of the said reservoir. The impure feed-water enters the reservoir
through pipe m, the inner end of which is bent upwards, and formed into a
funnel m. The water is heated first by coming into intimate contact with the
steam contained within the dome of the reservoir, and second, by flowing slowly
down through pipe into the lower compartment of said reservoir; the impurities
contained within the water separate and precipitate within said compartment, and
the water thus enters the boiler proper in a pure state.
Dated this 7th day of May 1895.
WILHELM SCHMIDT,
By J. P. Bayly,
18 Fulham Place, W., Agent for the Applicant.
'
I, WILHELM SCHMIDT, of Ballenstedt near The Harz, in the Duchy of Anhalt,
German Empire, Civil Engineer do hereby declare the nature of this invention,
and in what manner the saine is to be performed, to be particularly described and
ascertained in and by the following statement —
This invention refers to steam-boilers that are combined with a superheater
heated by the waste-gases of the furnace of the respective boiler; my improve-
neuts in boilers of said kind iclate to the combination of the superheater with a
boiler having vertical heating tubes, and connected with a resei voir adapted to
keep said boiler constantly perfectly filled with water.
The purpose of my
improvements is to make boilers of said kind apt for said combination by
preventing the vertical heating tubes of the boiler from being destroyed by the
strong heat requisite for effecting a high superheating of the steam, and I attain
that purpose by combining the said boiler with a reservoir constantly keeping said
tubes in the whole of their length surrounded by water, instead of by water and
steam, as in the heating-tube boilers known up to now
In order to make my invention more clear, 1 refer to the drawing sent in with
Provisional Application, in which similar letters denote similar parts throughout
the different views, and in which:
Figure 119 a vertical section through my improved steam-generator;
Figure 2 is a similai section through a modified form of construction.
Figure 3 13 a horizontal section taken on line 5-6 of Fig. 1, and
.
Figure 4 is a horizontal section taken on line 7-8 of Fig. 2.
Refering to Fig. 1, as the boiler, and a' the heating-tubes of the same,
said
tubes are arranged around a laige cential flue extending upwards from the

page_text: furnace b; said flue may partly or wholly be closed by a lid or cover 62. The
boiler a is connected by means of the pipes o e' with a reservoir d, which is kept
filled with water up to such a height, that the level of the water is constantly
higher than the upper ends of the heating-tubes a; the latter are, therefore,
constantly surrounded by water throughout their whole length.
The superheater e consists in the mode of construction shown of a column of
horizontal coils arranged above the boiler a, and between an outer casing f and an
inner casing, one end of said superheater 18 connected with the dome of the
reservoir d. The steam escaping from the latter, and flowing through the coils of
the superheater e, is superheated by the face-gases passing either though the
heating-tubes a' only, or through the flue b', too. If the latter is closed by the lid
or cover 2, the fire-gases will be comparatively much exhausted by the large area
of surface offered by the heating-tubes, and the degree of superheating will, thus,
be less than if a smaller or greater portion of said gases is allowed to escape
though the flue . There is, thus, thereby afforded a means of regulating the
degree of superheating of the steam.
Instead of employing a vertical reservoir I may use a horizontal one, as shown
as an example in Fig. 2. There is in this case but one connecting pipe between
said reservoir and the boiler, but, as a matter of course, two may be used. The
large central flue is replaced by heating-tubes, and the lid or cover is enlarged, and
provided with projections 63 adapted to close the greatest part of said tubes.
There is, thus, gained the same effect, as described with regaid to the mode of
construction first described.
The conical cover 62 (Fig. 1) or the flat cuver 63 (Fig. 2) may, as a matter of
course, be replaced by any other equivalent device, for instance by a flap, a
rotatable disk provided with openings, or the like.
If a large, central flue is employed as in Fig. 1, I prefer to contract within the
upper portion of the fire-box the way for the fire-gases by arranging within said
portion two horizontal boiler-tubes g g (Fig. 3) supporting fou plates h¹ h2 h3h4;
the latter cover the greatest part of the horizontal area of the fire-box, leaving only
a channel situated directly below the flue . The fire-gases are thus brought
into intimate contact with the flames, and will rush wholly or partly directly into
the Aue as soon as the lid 62 18 more or less raised. The lid 62, or 63
respectively, may be operated by a hand-lever connected to said lid by a
rod A'.
The form of construction of the reservoir shown in Fig. 1 may well be used for
purifying the feed-water for the boiler proper, for this purpose I arrange within
said reservoir a tube / having at its top a funnel, and terminating shortly above
the bottom of the said reservon. The impure feed-water enters the reservoir
through pipem, the inner end of which is bent upwards, and formed into a
funnel m. The water is heated first by coming into intimate contact with the
steam contained within the dome of the reservon, and second, by flowing slowly
down through pipe / mto the lower compartment of said reservoir; the impurities
contained within the water separate and precipitate within said compartment, and
the water thus enters the boiler proper in a pure state.
Having now particularly described the nature of my said invention, and in what
manner the same is to be performed, I declare that what I claim is :-
1 As a generator for highly superheated steam, the combination with a boiler
proper having vertical heating-tubes, of a reservoir forming the steam-space for
said boiler, and of a tube or tubes connecting said reservoir with the said boiler;
a superheater connected at one end with said steam-space; means for regulating
the flow of the fire-gases through said vertical heating-tubes, said means being
arranged between the boiler and said superheater, for the purpose as described.
2. As a generator for lughly superheated steam, the combination with a boiler
proper having vertical heating tubes, of a reservoir communicating with the
uppermost part of said boiler by means of a water-tube or -tubes, and forming

page_text: above the latter the steam space for the said boiler, a superheater connected at one
end with said steam-space; means for regulating the flow of the fire-gases through
said vertical heating-tubes, said means being arranged between the boiler and said
super heater, for the purpose as described
3. As a generator for highly superbcated steam, the combination with a boiler
proper having vertical heating tubes, of a reservou forming the steam-space for
said boiler, and of a tube or tubes connecting said reservoir with the said boiler;
a super heater arranged above said vertical heating tubes, and connected at one
end with said steam-space; a movable plate or ring adapted to close the uppor
ends of a number of the said heating tubes, for the purpose as described.
4. As a generator for highly superheated steam, the combination with a boiler
proper having vertical heating tubes arranged around a vertical flame tube, of a
reservoir forming the steam space for said boiler, and of a tube o tubes
comecting sau resei von with the said boiler; a superheater arranged above said
vertical heating tubes and connected at one end with said steam space; a movable
cover or hid adapted to close the upper end of said vertical flame-tube, for the
purpose as described.
Dated the 7th day of Kaluna 1000
J. P. BAYLY,
18 Fulham Place, London, W., Agent for the Applicant.