Year: 1889

page_text: [Communicated from abroad by MARTIN BOECKER, Blast Furnace Manager at the
Friedenshutte, near Morgenroth, Oberschlesien, Germany.]
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of Middlesex, Fellow of the Institute of Patent Agents, do hereby declare the
nature of this invention to be as follows:-
:-
This invention relates to the construction of regenerative hot-blast stoves according
to Cowpers system, and it consists in constructing the "filling" of such stoves with
openings varying in sectional area according to their distance from the inlet flue, in
order to insure a more uniform distribution of the heating gases throughout the whole
mass of the filling, and consequently a more effective utilisation of the heat.
The original Cowper hot blast stoves with central inlet passage had the disadvantage
that the flames and heating gases passing down through the filling left the outer
portion thereof untouched, such portion being the greater, the larger the diameter
and the smaller the height of the stove was. On account of this such Cowper stoves
have lately been constructed of smaller diameter and greater height, and with the inlet
flue arranged closely against the one side of the stove, so that the filling receives in
plan the shape of a crescent. But even with this construction the objection exists
that the heating gases pass only imperfectly in contact with those portions of the
filling that lie to one side of the direct line of draught of the chimney flue, which
still produces a more or less imperfect heating effect.
The present invention has for its object to obviate this defect and consists in making
the passages of the part of the filling that lies in the line of the direct draught, of
smaller sectional area than those parts that lie to either side thereof.
To accomplish a perfectly uniform distribution it would be necessary to make the
passages of gradually increasing sectional area from the direct line of draught to
either side, but this arrangement would entail considerable inconvenience and

page_text: expense, and it is therefore preferred to make only two or three variations in the area
of the passages, as this gives practically a very perfect result. Thus for example the
openings of the middle part of the filling, in the direct line of draught, may be made
about 7 inches square, and, those of the two side portions, about 7 inches square.
Dated this 21st day of January 1889.
ABEL & IMRAY,
Agents for the Applicant.
I, OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane in the County
of Middlesex, Fellow of the Institute of Patent Agents, 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:-
This invention relates to the construction of regenerativo hot blast stoves according
to Cowper's system, and it consists in constructing the "filling" of such stoves with
openings varying in sectional area according to their distance from the inlet flue, in
order to insure a more uniform distribution of the heating gases throughout the
whole mass of the "filling," and consequently a more effective utilisation of the heat.
The regenerative hot blast stove shewn in cross section on the accompanying
drawing, is heated by blast furnace gases. These gases pass at bottom at E into the
flue F, combine with the air supply, and the resulting flames riso through F into the
arched space at top of the stove, whence they descend through the passages formed
in the filling," giving off their heat to the latter, and escape at bottom through the
opposite discharge valve K to the chimney.
"
When the "filling" of the stove is sufficiently heated, the supply of blast furnace
gases and air for combustion is cut off, and cold air is admitted at G, which air in
passing up through the channels of the highly heated "filling "taking up heat there-
from, and descends through the flue on its way to the blast furnace.
The original "Cowper" hot blast stoves with central inlet passage had the dis-
advantage that the flames and heating gases passing down through the filling left the
outer portion thereof untouched, such portion being the greater, the larger the
diameter and the smaller the height of the stove was. On account of this, such
Cowper stoves have lately been constructed of smaller diameter and greater height,
and with the inlet flue arranged closely against the one side of the stove, so that the
filling receives in plan the shape of a crescent. But even with this construction
the objection exists that the heating gases pass only imperfectly in contact with

page_text: those portions of the filling that lie to one side of the direct line of draught of the
chimney flue, which still produces a more or less imperfect heating effect.
The present invention has for its object to obviate this defect and consists in making
the passages of the part of the filling that lies in the line of the direct draught, of
smaller sectional area than those parts that lie to either side thereof.
To accomplish a perfectly uniform distribution it would be necessary to make the
passages of gradually increasing sectional area from the direct line of draught indicated
by the arrow ZZ on the drawing, to either side, but this arrangement would entail
considerable inconvenience and expense, and it is therefore preferred to make only a
few, say two or three, variations in the area of the passages, as this gives practically a
very perfect result.
The accompanying drawing shews two such variations in the size of the passages,
those situated in the middle in the line of the direct draught being made for example
about 6 inches square, while those of the two side portions are made about 7 inches
square.
I am aware that in the Specification to Cochrane and Cowper's Patent No. 1623 of
1874 it was proposed to effect a more uniform distribution of the flames over the
passages of the filling by forming at the upper ends of such passages contractions,
which were made of different areas according to their position in the stove, and I do
not claim such an arrangement as of my invention, the paasages constructed according
to my invention being of uniform sizo throughout their length, whereby the advantage
is gained of preventing any material deposit of dust, such as would occur if the
passages were mado with contractions.
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
In regenerative hot blast stoves, constructing the passages of the " filling" of
variable sectional areas in such manner that their area is made to increase from the
middle or direct line of draught from the flue, towards the two sides, such increase
being made to take place either gradually or in a few stages, for effecting the more
uniform distribution of the flames and hot gases over the whole area of the filling each
passage being of uniform size throughout its length.
Dated thie 7th day of Marsh 1000
ABEL & IMRAY,
Agents for the Applicant.