IMPROVEMENTS IN METALLURGICAL FURNACES
Year: 1885

page_text: I, JOHN THOMSON KING of 4 Clayton Square, Liverpool in the county of
Lancaster do hereby declare the nature of the said invention for IMPROVEMENTS
IN METALLURGICAL FURNACES and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
In the accompanying drawing, Figure 1. is a vertical longitudinal section of
my improved furnace on the line A.-A. of the figure 2.
Figure 2. is a horizontal section on the line B-B. of figure 1.
Figure 3. is, a vertical cross section on the line C.-C. of figure 1.
Figure 4. is a section of the air-heating flues between the supporting piers on
the line B-B. of figure 1.
Like letters of reference indicate like parts in each.
My improvement is designed to cheapen the construction of re-generator furnaces
by substituting for the expensive and costly checker work chambers and working
appliances heretofore generally used, a simpler cheaper and efficient construction
and one which is not liable to get out of order and is easily repaired.
To enable others skilled in the art to make and use my invention I will now
describe it by reference to the drawings.
The bed A. is of the usual construction and is provided with a neck flue b.
through which the waste products of combustion pass therefrom. The flue b. is
connected with a descending flue c. which leads downwards to a point some
distance below the bottom of the bed. Under the bed is a chamber D. in which
are arranged a series of longitudinal flues e. composed of sections e¹ of pipes made
of fire clay or other suitable refractory material and above the flues e. is a clear
space or dome chamber d² into which the heated air rises after passing between
the pipes and before being led into the vertical flue n. These flues are supported
by the end walls d' at the end and by intermediate brick piers f. at the joints.
The piers are supported upon a floor g. of broad thick tiles which in turn are
sustained by piers h. which constitute the division walls of air flues i. extending
under the chamber d.-I have shewn in the drawings 3 rows of flues each row
filling the chamber d. entirely across its breadth. The piers f. are composed of
horizontal courses f¹ between each horizontal flues e. and vertical courses f
between each vertical row of flues. Between the piers the space occupied by the

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courses fl and f³ is open as shewn in figure 4 so that the air from the flues i. is
permitted to ascend between the pipes as shown by the arrows in figure 4. The
outlet passage c. communicates with the flues e. by openings e' through the inter-
mediate wall d' and that the other end the flues e, open directly into the stack
flue k. which leads up to the stack l.
The course of the products of combustion is from the bed through the flue b.
down the passage c. openings d. 2. flues e. stack flue k. and stack . At the front
end of the furnace is an air supply opening or chamber m. communicating directly
with the horizontal air flues i. The air enters the air flues & from the chamber m.
and passes directly under the flues e. between which it ascends as shewn by the
arrows in figure 4. into the dome of the chamber d. whence it passes by a vertical
flue n. upwards to the bridge wall a¹ and then over the bridge wall into the bed.
The gasses supplied from a supply pipe o. to a distributing main p. from which it
passes to the furnace by nozzles p² extending through the wall d and is delivered
at the upper end of the flue n. on or nearly on a level with the top of the bridge
wall a¹. The pipe o. leads from a gas-producer or other source of supply. In case
it is from a producer it enters the furnace at a high temperature but in case
purified gas is used it may be supplied directly from a suitable holder. If desired
the gas may be passed by suitable flues through the chamber d. in order to heat it
by the heat from the waste products of combustion passing out through the flues e.
The waste heat passing from the bed of the furnace as described through the
refractory flues e. heats the latter up to a very high temperature and the air
passing from the air flues i up between the flues e takes up the heat from the
latter and is delivered into the furnace in a highly heated condition. The con-
struction of the flues e of refractory material enables them not only to become
reservoirs of the best possible description for storing the waste heat but to resist
the intense temperature to which they are exposed without rapid desctruction,
while their formation in sections the ends of which are supported by the piers f
provides for such expansion and contraction as they are subjected to so that they
are not liable to become distorted or displaced thereby.
The chamber d is easily accessible for the purpose of removing or replacing
injured sections of pipe. The expense of the construction of this furnace as com-
pared with the ordinary Siemen's reversing regenerative furnace is small while on
the other band it gives practically the same results for many purposes.
My improvement may be adapted to existing furnaces with but little additional
expense and thereby avoids the necessity for the construction of the enormously
expensive Siemens regenerative furnaces.
Having now practically described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
The combination in a metallurgical furnace of a chamber arranged under the bed
provided with a series of flues for conveying away the waste products of com-
bustion composed of sections of clay pipes supported at the joints by suitable
piers air inlet passages entering said chamber below the level of waste flues a
dome chamber arranged above the waste flues, a flue leading from said chamber
to the bridge wall of the furnace, and a gas supply pipe or pipes discharging at or
near the bridge wall substantially as and for the purposes described.
☑
J. T. KING.
Per W. B. Johnson,