Improvement in Siemens-Martin Furnaces.
Year: 1891

page_text: Improvement in Siemens-Martin Furnaces.
A communication to me from HENRY SCHOENWAELDER, of Friedenshuette,
in the Empire of Germany, Foreman.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings, Chancery Lane, in the County of
Middlesex, 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 and accompanying drawing, that is to say :—
The little durability of Siemens furnaces working at a high temperature,
especially the modification well known as the Siemens-Martin furnace, arises
from the unequal action of the channels or passages, through which gas and
air pass from the generator to the furnace and the products of combustion pass
back, in consequence of which the furnace is not everywhere heated equally,
and is liable to burn through in some parts, whilst in others it remains nearly
unimpaired, though when repairs are necessary the whole of the usual refractory
lining has to be removed.
By the method of construction which forms the subject of the present invention
every channel or passage is provided with its own regenerator, which can be
regulated by a valve, so that the heat can be adjusted as required, whilst each
can be repaired from outside, without stopping the whole furnace.
In the accompanying drawing which is in illustration of the invention,
Figure 1 is a front view of a furnace half in section,
Figure 2 a plan, shewing the furnace and regenerator in section,
Figure 3 a vertical section through the middle of the furnace,
Figure 4 a vertical section through the side.
The furnace has on each side (instead of as heretofore one large gas and air
regenerator), two small ones, the air passing through the air regenerators and the
gas through the gas regenerators. The mixing of both takes place in the furnace
as usual, as the mixing in the channels would result in an explosion. The gases
from the furnace pass through four regenerators, which are separated by means
of partition walls from the others, and they first pass through reversible valves D
and F in the channel C. As soon as the valves are reversed the entering gas and
air pass through the four last mentioned regenerators to the furnace, and the
products of combustion pass out through the other four regenerators.
The valves are so adjusted that the entering gas passes through the cooled
regenerators and re-heats them.
In each channel G and H arranged beneath the regenerators are fitted sliding
valves, Figure 1, which can be raised or lowered, to regulate the draught in the
channels and thereby to ensure an equal wear of the same.
These valves can be adjusted so that the heat is transferred from the right to
the left side of the furnace and cice versa at will, so as to produce a uniform effect
in the furnace and to ensure a greater durability.
Instead of the division of the four regenerators into eight regenerators as
described, six or ten regenerators may be used in the same manner and for the
same purpose.
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. In Siemens-Martin-furnaces the method of making eight regenerators out of
four hr manns of a partition wall a channel A loading from each to the furnace B

page_text: so that one half serves to introduce the gas, and the other half to convey away
the products of combustion for heating, all substantially as described and shewn.
2. For the purpose of regulating the, draught and transferring the heat from
one side of the furnace to the other, the arrangement of sliding valves in the
channels, substantially as described and shewn.
3. The arrangement and use of six or ten regenerators in the manner and for
the purpose as described.
שי.
Santambon 1901
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.