Improvements in Steam Boilers.
Year: 1891

page_text: Date of Application, 20th July, 1891
Complete Specification Left, 21st Dec., 1891-Accepted, 23rd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
We, HEINRICH ACHENBACH and HEINRICH SCHULTE both of Ohle near
Plettenberg, in the German Empire, Steam Boiler Manufacturers, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to improvements in steam boilers and refers more
particularly to vertical tubular steam boilers, its object being a peculiar arrange-
ment of water tubes.
The essential feature of this invention is the division of the tubes of vertical
steam boilers into two groups, one of which riz.-the group situated nearest the
chimney is provided with Field tubes, the feeding water thus passing through the
latter tubes from the upper to the lower part of the boiler. This division is effected
by a central vertical plate, the tubes on the chimney side of which are provided
with Field tubes passing therethrough, while the other tubes are left undisturbed.
For large heating surfaces we combine two vertical boilers, the tubes of one
boiler nearest to the chimney being furnished with Field tubes passing through the
same, and projecting into the lower end of the steam boiler.
We sometimes provide the internal Field pipes with a cap, so that when steam is
being raised the water circulation shall not be impeded.
Dated this 20th day of July 1891.
RAYNER & CASSELL,
37, Chancery Lane, London, W.C., Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
We HEINRICH ACHENBACH and HEINRICH SCHULTE, both of Ohle near
Plettenberg, in the German Empire, Steam Boiler Manufacturers 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:—
Our invention relates to improvements in steam boilers and refers more
particularly to vertical multitubular steam boilers, its object being to promote a
more effectual circulation of the water by a peculiar arrangement of tubes.
According to this arrangement, the tubes are divided into two groups, one of
which consists of a number of ordinary tubes.
The other group consists of "Field" tubes, and is divided from the former by a
vertical plate, forming a bridge over which the hot gases from the fire box pass.
The plain tubes are situated next to the fire box, and the "Field" tubes next to
the chimney.
"
The feed water passes into the bottom of the boiler through one of the "Field
tubes, and the heated water and steam passes up through the plain tubes and the
annular passage of the "Field " tubes.
Where large heating surfaces are required, we combine two vertical boilers-the
one nearest the chimney being provided with "Field " tubes and the other with
ordinary tubes, the feed water passing through one of the "Field " tubes and the
water circulating in the same manner as in the single boilers.
The two boilers are connected together at both ends by a large tube.
We sometimes provide the "Field " tube with a cap so that when steam is being
raised the water circulation shall not be impeded.

page_text: In the accompanying drawings
Figure 1 is a vertical section of a single vertical multitubular boiler according
to my invention, and
Figure 2 is a similar section of the double boiler.
Figures 3 and 34 are respectively a vertical section and a sectional plan of the
cap provided at the top of the "Field " tubes.
Referring to Figure 1 a is the upper part of the boiler and a', the lower, con-
nected together by the ordinary tubes 6 on the side nearest the combustion
chamber and by the "Field" tubes h¹ on the side next to the chimney, they are
separated by the vertical plate e over which the hot gas indicated by arrows flow.
The feed water comes in through the pipe and flows down one of the central
tubes to the bottom of the boiler. The heated water passes up through the
tubes b, and the annular passage between the tubes i and 6, and the cooler down
the tubes i which project down into the lower part of the boiler, c, c¹, are man-
holes at top and bottom of the boiler.
In Figure 2 the arrangement is similar with the exception that two boilers are
used, the upper and lower parts of each being connected together by large
tubes f¹. The tubes are placed in the boiler A adjacent to the combustion
chamber 9 and the tubes b' in the boiler B. The feed water comes in through the
pipe d and flows down one of the tubes i as in the other boiler.
In Figures 3 and 34 is the cap forming the top of the tube i, the cool water
flowing down through the passages, and the heated water rising through the
opening 6º.
Having now fully described and ascert
tion and in what manner the same is to
claim is :-
(1). In vertical multitubular boilers divid
next the combustion chamber consisting of
chimney, of "Field " tubes so that the entra
through one or more of the central "Field"
through the ordinary tubes and the annular
as described and shown in Fig. 1 of the
ned the nature of my said inven-
e performed, I declare that what I
g the tubes into two groups, the one
inary tubes and the other, next the
e of the feed-water shall take place
'bes and the heated-water shall rise
e in the "Field " tubes, substantially
panying drawings.
(2). The combination of two ve
Ititubular boilers communicating with
one another, the rear boiler being provide ith "Field " tubes and the fore boiler
with ordinary tubes, so that the entrance of he feed water shall take place through
one or more of the central "Field " tubes, and the heated water rise through the
ordinary tubes and the annular space in the "Field " tubes, substantially as described
and shown with reference to Figure 2.
Dated this 21st day of December 1891.
RAINER & CASSELL,
37, Chancery Lane, W.C., Agents for the Applicant.