Year: 1886

page_text: Date of Application, 1st Dec., 1886.
Complete Left, 22nd Aug., 1887
Complete Accepted, 27th Sept., 1887.
I, ADOLF KNAUDT, manufacturer, residing at Essen on the Ruhr, Kingdom of
Prussia, do hereby declare the nature of this invention to be as follows:-
My invention relates to steam-boilers having large corrugated flame-tubes, and its
object is, firstly, to produce a more intimate contact of the flaines and combustion-
gases with the walls of the tube, and consequently a more rapid transition of heat to
the water in the boiler, and secondly, to impart such speed to the said gases that a
deposition of dust in the flame-tube will be avoided.
For this purpose I construct within the tube a number of partition-walls, forming
an uneven number of longitudinal flues, for instance three or five, the said flues being
so connected at their ends that the combustion-gases will pass in succession from one
flue to the other and finally issue from the flame-tube by the last flue.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam-boilers with Corrugated Flame-tubes.
I, ADOLF KNAUDT, manufacturer, residing at Essen on the Ruhr, Kingdom of
Prussia, 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:
My invention relates to steam-boilers having large corrugated flame-tubes, and its
object is, firstly, to produce a more intimate contact of the flames and combustion-
gases with the walls of the tube snd consequently a more rapid transition of heat to
the water in the boiler; secondly, to impart such speed to the said gases that a
deposition of dust in the flame-tube will be substantially avoided, and, thirdly, to
prevent the formation of smoke.
For this purpose I construct within the tube partition-walls of brick-work, the said
walls being arranged to form an uneven number of longitudinal flues, for instance
three or five, which are so connected at their ends that the combustion-gases will pass
in succession from one flue to the other, and finally issue from the flame-tube by the
last flue.
On the annexed sheet of drawings a boiler provided with my improvement is shown
by Fig. 1. in vertical longitudinal section, by Fig. 2 in horizontal section, by Fig. 3
in a section on line m n looking towards the front, and by Fig. 4 in a section on line
op looking towards the rear. is the flame-tube having peripherical corrugations,
dan arched wall built of fire-proof bricks and forming between it and the lower portion
of the tube the flue a, and e a vertical brick wall that divides the space above the
wall a into the flues b and c. The flues and c are closed at the forward end and
the flues a and b at the rear end, while the flue a opens out at the forward end into the
combustion-chamber and communicates at the rear end with the flue b, which in its
turn communicates at the forward end with the flue c, connected at the rear end with
the outer flues of the boiler, not shown in the drawing. The combustion-gases are
thus caused to pass from the chamber g in succession through the flues a b c, as
indicated in Figs. 1 and 2 by arrows. The length of the passage of the gases through
the tube is thereby increased, the gases are brought in closer contact with the heating-
surface of the tube, and their speed is augmented in proportion as their area is reduced
relatively to the area of the tube. Besides, as the walls separating the flues from cach
other, consist of brick-work, they will store up a considerable quantity of heat, whereby
the formation of smoke within the flues is in a great measure reduced or entirely
prevented.

page_text: Instead of constructing the said partition-walls parallel to the centre-line of the
tube, they may also be carried out in the form of screw-lines.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed, I declare that what I claim is:
The construction, within a corrugated flame-tube of a steam-boiler, of longitudinal
partition-walls of brick-work, adapted to increase the length of passage of the
combustion gases through the tube, substantially as and for the purpose described.
Dated the Sixth day of August 1887
CARL PIEPER,
45, Southampton Buildings, London, W.C.,
Agent for Applicant.