Smoke-consuming Apparatus for Steam Boiler and other Furnaces.
Year: 1896

page_text: COMPLETE SPECIFICATION.
Smoke-consuming Apparatus for Steam Boiler and other Furnaces.
I, CARL WILHELM STAUSS, of 23 Spenerstrasse, Berlin, in the Empire of
Germany, Manufacturer, 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 improvements in the apparatus, described in the
Specification of Letters Patent No. 3567 of 1892, for obtaining a smokeless
combustion, the object being to protect as much as practicable the air heater for
the secondary air serving for the combustion and designed to be introduced
against the stopping up of the air and fire slots.
The slots in the air heater are prevented from being stopped up by the special
form of the plates of the same, and by the fact that the air slots and also fire slots
open downwardly in such a manner that flying ashes which enter the slots will not
be deposited there and stop up the slot, but will drop from the slots downwards in
order to be then conveniently removed.
The accompanying drawing represents the invention, the air heater being
arranged in the flue of a steam boiler.
Fig. 1 is a longitudinal section of the air heater, showing an air slot in section.
Fig. 2 is a transverse section of Fig. 1, being a section through the air heater.
Fig. 3 shows a plate of the air heater, the fire slot being represented in elevation.
The apparatus consists of two principal parts, the air heater A. and the beam or
girder B for the same and the fire-bridge.
The air heating body A is composed of plates which have three different shapes.
The plates a have ribs u u¹ on the right and left hand side (Fig. 1). The
plates a bave the ribs m m² m² above, on the left hand side and extending obliquely
downwards. These two kinds of plates are placed side by side, as shown
in Fig. 2. As closing plates on each side of the composite body I use the
plates a³ which shut off the cavity of the fire bridge on the right and left hand
Each plate
side. The space still remaining laterally in the flue is walled up.
possesses at the top a projecting hook c. The composite plates are held together
by a screw-threaded bolt d extending transversely through the same and by the
three-armed bridge pieces e on the two sides. As shown in the drawing the plates
extend downwardly in the form of a triangular point. Put together they con-
stitute slots for the secondary air and slots f for the admission of the products of
combustion.
The bearer B of the fire bridge consists of a box shaped frame. To the bearer B
is screwed the bearer of the fire-bars which may be used in various widths either
for broad fire-bridges r or for narrow fire-bridges r, the former serving for
ordinary flues and the latter for short flues, particularly for marine boilers. The
bearer B of the fire bridge is supported upon two brackets 6' 6' (Fig. 2) which bear
upon the wall of the flue. Below the bearer B, and laterally confined by the
brackets is an ash box g which is adapted to be removed and into which the
ashes entering the air slots 1 drop through the lower aperture o in the bearer B.
This bearer B has in front an aperture o' which is closed by means of a flap k
which can be opened or closed more or less for the admission of air, by means of a
rod n by hand or by a special device.
The air heater A is suspended by means of the hooks c from the hollow bearer B
of the fire bridge and is supported at s.
The draught of the chimney draws air through the flap k which air passes from the

page_text: hollow bearer B of the fire-bridge into the air slots land, being prevented from
escaping to the rear by ribs u', leaves at the top in order to pass into the products
of combustion...
The draught of the chimney moreover effects the suction of the air behind the
fire bridge or behind the apparatus, and consequently the rarefaction of the same
at this point. By reason of the space in which the air is thus rarefied the products
of combustion passing over the fire bridge are energetically drawn downwards and
pass thence into the fire slots confined by the ribs m m² m². Here and directly
behind the apparatus there is only a strong whirl, causing the secondary air
likewise strongly heated in contact with the intensely hot plates, to be intimately
mixed with and well distributed among the current of fire, so that the gases
which are still unburnt will all be ignited and give rise to a perfectly smokeless
combustion.
The ashes and particles of coal falling down upon the surface of the apparatus
drop through the slots land aperture o' downwards, are collected in the removable
box g, and, by simply withdrawing the latter, may be conveniently removed also
during the working; at the same time the ashes collected behind the apparatus
may also be completely removed with a rake or scraper. No particles of ashes can
become fixed in the fire slots f because they must fall downwards again on the
inclined rib m².
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is:
1. The air heater A consisting of plates al with lateral ribs u u¹, and plates a³
with upper, lateral and oblique ribs mm² m² thereby forming air slots / and fire
slots in which the collection of ashes is prevented.
2. The hollow bearer B of the fire bridge, upon which the air heater A is placed
so that flying ashes entering the air slots must fall downwards.
3. The arrangement of the ash box q provided below the bearer B of the
fire-bridge, in combination with the aperture o in the bottom of B for the reception
of the flying ashes falling down from the slots l.
Dated this 16th day of April 1896.
S. S. BROMHEAD,
97 Newgate Street, London, Patent Agent.