Improvements in Furnaces for. Steam.Generators and other. Evaporating Apparatus.
Year: 1894

page_text: Date of Application, 13th Dec., 1894-Accepted, 14th Sept., 18950
COMPLETE SPECIFICATION...
Improvements in Furnaces for. Steam.Generators and other.
Evaporating Apparatus.
I, CHRISTIAN ALBERT JENSEN of No. 77 Chancery Lane in the County of Middle-
sex Chartered Patent Agent do hereby declare the nature of this invention (a com-
munication to me from abroad by Rudolf Müller of Myrens Værksted, Christiania in..
the Kingdom of Norway, Mechanical Engineer) 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 furnaces for steam boilers and other evaporating
apparatus and has for its object to improve the construction of such furnaces so 88
to make them more economical and to obtain a smokeless combustion.
To this end my invention consists in the combination with a usual grate furnace
of a row of compartments or channels arranged at a short distance above the grate
over the whole length of the same and serving alternately as bolders or magazines.
for the fuel (coal) and as combustion channels. By this construction..the fuel will,
never in its cold state cone into contact with the glowing and burning coals and..
gases, but will sink slowly down through the said compartments and. gradually
become heated giving off the gases to the fire, and finally come down on the grate.
and I obtain in this manner a complete combustion and a great saving of coal.. The.
partitions or walls forming the channel are made of fire resisting material or when.
the furnace is applied to a steam boiler or other evaporating apparatus they are by
preference made in the form of hollow boiler boxes communicating with the water
space of the boiler.
In order to better explain my invention I have shown in the accompanying
drawings one mode of constructing my new furnace the same being in this case..
arranged under a steam boiler of the water-tube type.
Figure 1 shows front elevation and cross section of the furnace and boiler .and.
Figure 2 shows a longitudinal section of the same on the line 2-2 Figure 1.
A is a row of partitions made in the form of wrought iron welded water boxes of
an oblong cross section placed at a short distance above the grate and parallel .or.
nearly so with the same. These water boxes communicate through the pipes. B (in
front) and the pipe C (at back) with the waterspace of the steam drum of the boiler;
the water circulation may however also be arranged in other ways. Between these.
water boxes there is alternately formed a fuel magazine and a combustion channel,.
the former being covered by arch-shaped roofs D of cast iron or fireproof material,
so that these spaces only communicate with the others below the water boxes..
These arches are open at E in the front wall of the boiler, so that air may enter
through the openings E and pass through the fuel in the magazine. Through the
openings E the fuel is also supplied to the magazines, which may be done by means
of a narrow trough F, which is about as long as the length of the furnace and is
pivotally suspended in a hanger G, the upper end of which has a knob that may
slide in a recess H in the arch D. This trough is filled with coal when in a drawn-
out position indicated in Figure 2 (part of same being broken off), and then pushed
into the magazine channel, when it is turned round, so that it is emptied. This
arrangement however is well known and therefore needs no detailed description.
Below the combustion channels there are or may be arranged hollow fire
bridges I in the whole length of the grate. At the top of the same there are
slots K through which air, the supply of which may be regulated by means of the

page_text: dampers M, and steam or vapours from the troughs L, may enter into the fire spaces.
It will be seen that in this way air is supplied to the burning fuel and gases in
three different ways, partly through the coal magazines, partly through the grate
and partly through the fire bridges and when suitably regulated a complete and
smokeless combustion may be obtained in this manner, as no cold air or cold coals
reach the burning particles of solid or gaseous fuel.
In the front wall of the boiler, doors O and P are provided, through which the
fire spaces, the magazines and the grate may be cleaned out, and the fire stoked.
Rare cleaning out holes for. the water boxes. There is also for similar purposes
provided a mud pipe S which connects the pipe C through the branch pipes T with
the water boxes A.
The above described furnace may of course be modified in several respects as to
details of construction and arrangement, which may also be altered according to
the purposes for which it has been designed; and there may be used for instance a
rocking grate instead of a usual plain grate all without departing from the principle
upon which my new furnace is constructed.
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 as the invention communicated to me, is :-
1. In a furnace for steam generators and other evaporating apparatus the com-
bination with the grate of longitudinal partitions placed at a short distance above
the grate and forming between them alternately fuel magazines and combustion
channels.
2. In a furnace for steam generators and other evaporating apparatus the com-
bination with the grate of longitudinal partitions placed at a short distance above
the grate and formed by water boxes of an oblong cross-section, communicating with
the water space of the boiler, said water boxes forming between them alternately
fuel magazines and combustion channels.
3. In a furnace for steam generators and other evaporating apparatus the com-
bination with the grate of longitudinal partitions placed at a short distance above
the grate the spaces formed between same being alternately covered at the top and
open.
4. In a furnace the combination with the grate and water boxes arranged above
the same so as to form a row of partitions, of arch-shaped covers (D) placed across
two and two of the water boxes and having an opening E in the front of the boiler,
said covers being on their inside provided with ineans for supplying fuel to the
magazines formed between the said water boxes substantially as specified.
5. In a furnace the combination with the grate and water boxes arranged above
the same to form a row of partitions of longitudinal fire bridges I arranged at
certain intervals in the grate said fire bridges being hollow and having slots K and
being also provided with water troughs L and dampers M.
6. A furnace for purposes specified substantially as described and shewn in
annexed drawings.
Dated this 13th day of December 1894.
JENSEN & SON,
77. Chancery Lane, London, W.C., Patent Agents.