Improvements on Hot Blast Stoves.
Year: 1890

page_text: Date of Application, 10th June, 1890
Complete Specification Left, 10th Mar., 1891-Accepted, 25th Apr., 1891
PROVISIONAL SPECIFICATION.
[Communicated from abroad by HUGH KENNEDY, Blast Furnace Engineer, of
Sharpsburg, in the County of Alleghany and State of Pennsylvania, United
States of America.].
Improvements on Hot Blast Stoves.
I, Joux THOMSON KING, of 4, Clayton Square, Liverpool, in the County of
Lancaster, Patent Agent, do hereby declare the nature of this invention to be as
follows:-
My invention relates to vertical hot blast stoves which are heated by the com-
bustion of waste gases from the furnaces and are utilized to heat the blast. These
stoves are provided with valves for reversing the currents by which they are
traversed, so that at one time the waste heat from the furnace is passing through them
in one direction, and later the blast of air from the blowing engine is being forced
through them in the opposite direction into the furnace. They are used in couples,
so that whilst the waste heat is passing out through one or more, heating them up,
the blast is being forced in through an equal number, which have been previously
heated by the passage therethrough and combustion therein of the hot waste gases.
When one set becomes heated and the other cold by the currents passing through
them, the valves are reversed, and then the currents pass in the opposite
directions.
My invention further relates to that class of stoves in which the interior is
composed of a series of vertical channels extending through refractory brickwork,
and designed to give a long run to the gases and air over the same, for the purpose
of taking up from the hot gases all the heat contained therein and to impart the
same, in turn, to the inflowing air.
The object is to produce a simple cheap efficient and economical hot blast stove.
The invention consists essentially in constructing a hot blast stove with one or
more pairs of flues separated by a vertical, flue wall so made that the said flues
communicate at the upper portion of the stove. The said flues have air and gas
inlets at their bases, a common outlet at the top, and an air blast inlet and outlet
from and to which the, air passes through the flues.
Dated this 9th day of June 1890.
Ter pro
J. Johnson.
COMPLETE SPECIFICATION.
Improvements on Hot Blast Stoves.
I, JOHN THOMSON KING, of 4, Clayton Square, Liverpool, in the County of
Lancaster, Patent Agent, 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:-
My invention relates to vertical hot-blast stoves which are heated by the com-
These
bustion of waste gases from the furnaces and are utilized to heat the blast.
stoves are provided with valves for reversing the currents by which they are
traversed, so that at one time the waste heat from the furnace is passing through
them in one direction, and later the blast of air from the blowing engine is being
forced through them in the opposite direction into the furnace. They are used in
couples, so that while the waste heat is passing out through one or more, heating
them up, the blast is being forced in through an equal number, which have been

page_text: previously heated by the passage therethrough and combustion therein of the hot
waste gases.
When one set becomes heated and the other cold by the currents
passing through them, the valves are reversed, and then the currents pass in the
opposite directions.
→
My invention further relates to that class of stoves in which the interior is
composed of a series of vertical channels extending through refractory brickwork,
and designed to give a long run to the gases and air over the same, for the purpose
of taking up from the hot gases all the heat contained therein, and to impart the
same, in turn, to the inflowing air.
The object is to produce a simple, cheap, efficient and economical hot blast
stove.
The invention consists essentially in constructing a hot blast stove with one or more
pairs of flues separated by a vertical flue wall so made that the said flues commu-
nicate at the upper portion of the stove. The said flues have air and gas inlets at
their bases, a common outlet at the top, and an air blast inlet and outlet from and
to which the air passes through the flues.
Referring to the figures on Sheets 1 and 2 of the drawing:-the stove has a
cylindrical metallic shell 2, lined with brickwork 3. The stove is divided into
several passes by a number of vertical partition walls 4, 5, and 6, of which I have
shown three, thus dividing the stove into four passes, though it should be under-
stood that my invention is not limited strictly to this number of passes, since by
suitable modifications, such as will suggest themselves to skilled blast furnace
engineers, the construction may be modified so that the stove shall afford other
numbers of passes. Each of the passes b, c,d, and e, is preferably divided into
numerous small passages or flues by brickwork arranged in the manner shown in
Figures 1 and 2, or otherwise, and below this brickwork, the flues are open to form
combustion chambers, in which gas and air are burned for the purpose of heating
the stove. The walls 4, 5 and 6, are arranged so as to afford communication
between the flues b, c, d, e, at alternate ends thereof. Thus the walls 4 and 6
extend from the bottom of the stove towards-but not to-the top, while the wall 5
extends to the top, and at the base is provided with arched openings 7, connecting
the flues and d. On each side of the partition wall 5, at the top of the stove, is.
a stack flue or chimney 8, 9, each of which has a suitable valve 10, and at the base
of the stove, are pipes 11, for the admission of the gas and air by which the stove
is heated as a preliminary to forcing the blast therethrough. I have shown four
of these gas and air inlet pipes, one for each of the vertical passes of the stove, but
if desired, a single inlet pipe may be used for both of those flues which communicate
at the base, i.e. the flues: and d.
11, are man-holes by which access may be had to the interior of the lower part
of the stove for cleaning it. The stove is also provided with the usual adit
pipe 12 leading from the air blowing engine, and an exit pipe 13 leading to the blast
furnace.
These pipes communicate with valve chambers 14 and 15 of the usual
construction.
In the operation of the stove, the vertical flues are first heated by admitting air
and gas through the pipes 11, and burning the gas in the combustion chambers at
the bases of the flues. The burning gases ascend through each of the flues b, c, d, e,
and escape directly therefrom through the stacks 8, and 9, the stack 8 serving to
carry off the products of combustion from the flues d, e, on one side of the vertical
wall 5, and the stack 9 to perform the same function for the flues on the other side
of this wall. When the stove has been properly heated, the air and gas are shut off
from entering the pipes 11, the valves 10 are closed, the valves 14 and 15 opened
and the air blast is admitted through the valve chamber 14. The air passes in
succession through the several flues b, c, d and e, as shown by the arrows in
Figure 1, and escapes through the flue 13 leading to the blast furnace, thus passing
through the entire heating space of the stove, and utilizing the whole thereof in
supplying heat to the blast..
In Figure 4, the construction of the furnace is the same as that above described

page_text: except that instead of having four passes for the air, there are but two passes,
there being but a single internal partition wall 6 extending towards-but not
up to the top of the stove. This is desirable for some reasons, principally because,
as the vertical wall does not extend to the top, its expansion and contraction in the
heating of the stove will not displace or injure the arch or crown. The fact that
there is only one stack opening in the arch makes the stove easy to construct and
makes it strong and durable.
It will be seen that the construction of Figure 1, is a duplication of that of
Figure 4, in that while in Figure 4, I show but one pair of flues communicating at
the crown of the furnace and having a common stack-flue, in Figure 1; I show
two such pairs, separated by the central wall 5.
The feature in which my invention consists is the construction of the stove
with at least a pair of flues separated by a vertical flue-wall and communicating
at the upper portion of the stove, said flues having air and gas inlets at their
bases, a common outlet at the top and an air blast inlet and outlet from and
to which the air passes in series through the flues. Within the limits of the
construction above stated, the stove may be modified in form in various ways.
The advantages of my invention will be appreciated by those skilled in the art.
The stove is simple and cheap in construction, and by reason of the direct passes
for the gas, it is easy to heat, is economical in the amount of gas necessary to be
consumed, and is otherwise very desirable.
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 is :-
First. In a hot blast stove, the combination of a pair of flues separated by a
vertical flue wall, and communicating at the upper portion of the stove, said flues
having air and gas inlets at their bases, a common outlet at the top, and an air blast
inlet and outlet from and to which the air passes in series through the flues; sub-
stantially as and for the purposes described.
Second. In a hot blast stove, the combination of a pair of flues separated by a
vertical flue wall, and communicating at the crown of the stove above said wall,
said flues having air and gas inlets at their bases, a common outlet at the top, and
an air blast inlet and outlet, from and to which the air blast passes in series through
the flues; substantially as and for the purposes described.
Dated the 9th day of March 1891.
Per pro J. T. KING,
W. B. Johnson.