Improvements in Regenerative Gas Furnaces.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Regenerative Gas Furnaces.
I, FREDERICK SIEMENS, of No. 10 Queen Anno's Gate, Westminster, in the
County of London, Engineer, do hereby declare the nature of this invention to be
as follows:-
In my previous Specifications No. 4644 of 1889, No. 20,083 of 1889 and
No. 16,207 of 1890 I have described regenerative gas furnaces with producers in
proximity to their beds and with passages and steam injectors so arranged that
not only air but also, when desired, portions of the products of combustion could
be passed through the producers. The space behind the furnace being occupied by
the producers, access could not in these furnaces be got to any door through the
back wall, through which tools could be passed to clear or close from inside the
tap hole in the front wall which is required in furnaces for melting steel or cast
iron. According to my present invention, I divide the structure of the producers
into two separate structures building one at each end of the furnace with a central
space between them giving access to a door in the back wall of the furnace bed,
I may connect the lower chambers of the producers by a flue under this space,
and I connect the valve chambers into which gas passes from the producers by a
flue over this space. In this upper flue and also in the lower flue, when such
a flue exists, I provide a valve or damper, which is closed when either of the
producers is being cleaned or cleared of ashes or repaired, the other producer alone
supplying gas for the furnace flame which sweeps along the bed to the outlet near
the end where the temporarily idle producer is situated. In cases where the
producers are not thus built separate, I make the bed part of the furnace longer so
as to project at each end beyond the producers and I make these extended parts"
with their back walls at an angle to the longitudinal line of the bed, providing in
either or both of these inclined walls a door or doors in line with and opposite to
a tapping hole or tapping holes in the front wall of the bed, these tapping holes
being inclined so as to stand at right angles to the inclined back walls. I can thus,
from inside the bed, clear or close the tapping holes by tools of moderate length
having to extend somewhat obliquely across the bed, which, being longer, may be
narrower than usual. In some cases I provide doors in the end walls and tap holes
in the front wall at such obliquity that tools can be passed through the end doors
directly into and through the tap holes.
When the furnace requires no tap hole, as for instance when it is used for glass
melting, the space between the producers is not required for access to a door in the
back wall, and therefore the flue by which the lower chambers of the producers may
be connected does not necessarily require to be under this space.
Dated this 26th day of Mar 1896
ABEL & IMRAY,
Agents for the Applicant.

page_text: Improvements in Regenerative Gas Furnaces.
I, FREDERICK SIEMENS, of No. 10 Queen Anne's Gate, Westminster, in the
County of London, 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:-
In my previous specifications I have described regenerative gas furnaces with gas
producers in proximity to their beds with both gas and air reversing valves, and
with passages and steam injectors so arranged that not only air but also, when desired,
portions of the products of combustion with or without heated air could be passed
through the producers.
The space behind the furnace being occupied by the producers, access could not
in these furnaces be got to any door through the hack wall, through which tools could
be passed to clear or close from inside the tap hole in the front wall which is required
in furnaces for melting steel, iron or other metals.
According to my present invention I divide the structure of the producers into two
separate structures building one at each end of the furnace with a central space
between them giving access to a door or doors in the back wall of the furnace bed.
Fig. 1 of the accompanying drawings is a section on the line 1-1 of Fig. 2 which
is a sectional plan of a furnace according to my present invention for melting steel or
other metal. Fig. 3 is a sectional plan and Fig. 4 a transverse section on the line 4-4
of Fig. 3 of a glass melting furnace similarly arranged. A is the furnace chamber,
BB the two producers having between them a free space C giving access to a door Din
the rear wall of the chamber in line with the tapping hole or spout E. Instead of one
door D there may be several in the back wall. I connect the valve chambers into
which gas passes from the producers by a flue G preferably over the space C, and
when necessary I connect the lower chamber of the producers by a flue under the
space C. In the upper flue G.and also in the lower flue F when such a flue exists,
I provide valves or dampers H which are closed when either of the producers is being
cleaned or cleared of ashes or repaired, the other producer alone with additional blast
if necessary supplying gas for the furnace flame which sweeps along the bed to the
outlet near the end where the temporarily idle producer is situated.
In the case of the glass furnace shewn in Figs. 3 and 4, in which figures the same
letters, as in Figs. 1 and 2, are used to denote like parts, the glass tank A besides
having its two opposite doors D and E has the usual openings at the ends for working
out.
In cases where the producers are not thus built separate as shewn in sectional
plan Fig. 5, I make the bed part A of. the furnace longer so as to project at each
end as at a a beyond the producer, and I make these extended parts a a with their
back walls bb at an angle to the longitudinal line of the bed, providing in either
or both of these inclined walls bb a door or doors in line with and opposite to a
tapping hole E or tapping holes in the front wall of the bed, these tapping holes
being inclined so as to stand at right angles to the inclined back walls 6 b. I can
thus from inside the bed, clear or close the tapping holes by tools of moderate
length having to extend somewhat obliquely across the bed, which, being longer, may
if desired, be narrower than usual.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what
I claim is :-
1. A regenerative gas furnace having its gas producer made in two parts, one part

page_text: behind each end of the bed, with a free space between the two parts, substantially as
and for the purposes set forth.
2. In a regenerative gas furnace having a single gas producer behind the bed, an
extension of the end of the bed beyond the producer with an oblique end wall having
a door, and a tap hole in front of the bed made with corresponding obliquity,
substantially as and for the purpose set forth.
Dated this 26th dox of February 1897
ABEL & IMRAY,
Agents for the Applicant.