Improvements in Fire-grates for Burning Coal Dust, Slack, and other Combustible Refuse.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in Fire-grates for Burning Coal Dust, Slack, and
other Combustible Refuse.
I, JOSEF KUDLICZ, of Prague-Bubna, in the Empire of Austro-Hungary,
Foundry Proprietor, 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:-
Thompson's Patent No. 8949 of 1891 a communication from the present inventor
Josef Kudlicz relates to a fire-grate for the combustion of coal-dust, coal slack,
and other combustible refuse. The fire-grate consists of a number of hollow fire-
bars laid side by side and having small perforations through which air under
pressure issues in order to keep the coal-dust or the like floating just above the
surface of the grate and thereby effect the complete combustion of the fuel.
Experiments with the said apparatus have shown that in smaller fire-grates and
up to medium size, it is preferable to employ a single hollow box or air-chamber K
of suitable size which for small grates may be covered with only a single plate P for
supporting the fuel.
In the accompanying drawings
Fig. 1 is a section of a portion of the top or perforated plate of the complete
apparatus shown on a smaller scale in perspective in Fig. 2
Fig. 3 is a longitudinal section through a portion of the nozzle or steam- or
air-injecting end of the apparatus and
Figs. 4 and 5 represent modifications.
The box or chamber K as shown in Figs. 2 and 3 is provided at the front or
bottom with a short conical nozzle or tube T the straight part of which
extends into the interior of the box or chamber and having a steam pipe R of
suitable size with a nozzle d arranged centrally in the part r, see Fig. 3 for the
purpose of allowing of the injection of either steam or compressed air into the box
or chamber. The steam or compressed air issuing from the nozzle d draws
atmospheric air through the short conical tube T and forces it into the box or
chamber K from which the air is driven under a certain pressure, as described in
the former Patent No. 8949 of 1891, through the perforations p in the top plate so
as to strike against the fuel and causing the latter to float and circulate as shown
in the sectional view Figure 1.
It is preferred to place the air inlet tube T at or near the bottom of the box or
chamber K so as to serve as a hole for raking out the ashes from the interior of
the said box or chamber. When this invention is used in connection with so-called
step-grates there are used a number of plates A A' forming steps consisting each
in a horizontal part A and an inclined or vertical part A' as shown in Figure 4,
the stepped plate A. A constituting the top of the box or chamber K which in
this example would be inclined and provided at preferably its upper end with an
air injector d Rr T. The said steps are provided with small openings p widening
toward the interior of the air-chamber arranged so that the centre line of each of
said openings is at a right angle to the line B of general inclination of the grate
as shown in Figure 4.
Figure 5 shows a method of increasing the effective firing surface by using top
plates of zigzag, wavy or irregular form, instead of a flat top plate as shown in
Figure 2.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is ;-
1 A fire-orate constructed on the principle set forth in (Specification No 2010

page_text: of 1891 in which the air is introduced into the chamber K by means of an
injector.
2. In a fire-grate constructed on the principle set forth in Specification No. 8949
of 1891 the employment above the chamber K of one or more zigzag stepped wavy
or equivalent plates provided with conical openings the centre lines of which are
perpendicular to the line of general inclination of the grate substantially as
described and illustrated in the accompanying drawings.
Dated this 3rd day of July 1893.
W. P. THOMPSON & BOULT,
Agents for the Applicant.