Improvements in Steam Superheaters.
Year: 1890

page_text: Date of Application, 17th Nov., 1890
Complete Specification Left, 14th Mar., 1891-Accepted, 18th Apr., 1891
PROVISIONAL, SPECIFICATION.
Improvements in Steam Superheaters.
I, MAX GEHRE, of Rath, near Dusseldorf, in the Empire of Germany, do
hereby declare the nature of this invention to be as follows:-
This invention relates to a water-chamber for tubular steam superheaters the
object of which is to protect the front tube plate from the action of the fire, and
also to ensure the perfect tightness of the tubes. For this purpose a water-chamber
is arranged in front of the tube plate and within such chamber are placed tubes
Around
adjoining or forming extensions of the flue-tubes of the superheater.
these extensions of tubes water is caused constantly to circulate so that when the
temperature of the products of combustion rises to an excessive degree it exercises
a cooling action, while at the same time it assists in securing the tightness of the
joints in the tube plate. A. constant supply of water is kept circulating round the
tubes in the water chamber as it passes from the inlet to the outlet.
The steam to be superheated enters one end of the superheater through a suitable
inlet pipe flows round the tubes and upon being strongly superheated escapes
through the outlet at the opposite end.
Dated this 17th day of November 1890
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Steam Superheaters.
I, MAX GEHRE, of Rath, near Dusseldorf, in the Empire of Germany, 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-chamber for tubular steam superheaters the
object of which is to protect the front tube plate from the action of the fire, and
thus to ensure the perfect tightness of the tubes. For this purpose a water-
chamber is arranged in front of the tube-plate and within such chamber are placed
tubes forming extensions of the flue-tubes of the superheater. Around these
extensions of tubes water is caused constantly to circulate so that when the
temperature of the products of combustion rises to an excessive degree, it exercises
a cooling action, which assists in securing the tightness of the joints in the tube
plate.
In the accompanying drawings ;-
Fig. 1 is a longitudinal section of a portion of a steam-superheater provided with
a water-chamber constructed in accordance with this invention.
Fig. 2 is a front view of the water chamber and
Fig. 3 shows a modification thereof.
The water chamber is arranged in front of the tube plate a of the superheater
and contains a number of tube sections 6' forming extensions of the flue tubes .
The gases from the fire-box are thus enabled to pass freely through such tube-
sections and through the adjoining flue-tubes r in the direction of the arrows in
Figure 1. The tubes may if desired be dispensed with, and the flue-tubes T
simply lengthened sufficiently to pass through the water-chamber in the manner for
example shown in Fig. 3. This water chamber protects the tube-plate a from
immediate contact with the gases generated by combustion and from consequent
37

page_text: injury. A constant supply of water is kept circulating round the tubes in the
water chamber in its passage from the inlet s to the outlet s'.
The steam to be superheated enters one end of the superheater through a
suitable inlet pipe, flows round the tubes r and escapes through the outlet at the
opposite end.
The extension of the tubes may be made in one piece with the tubes themselves
or may be jointed to them.
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 tubular steam superheater a water-chamber such as 6 in front of the
tube-plate of the superheater next to the fire and containing tubes such as b¹
forming extensions of such tubes (r) substantially as and for the purpose described
and illustrated in the accompanying drawings.
2. In a tubular steam superheater the combination with the tube plate a of a
water chamber such as 6 substantially as and for the purpose described and
illustrated in the accompanying drawings.
Dated this 14th day of March 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.