Year: 1886

page_text: We, BENJAMIN FORD, Engineer of Middlesbrough-on-Tees, in the County of
York and JOHN MONCUR, of the Distington Iron Works, Cumberland, 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
Our invention which relates to regenerative bot-blast stoves for heating the air
blast for blast furnaces and is in part a development of the invention described in
the Specification of Letters Patent No 3897 of 1882, granted to us, has for its
objects the making provision for more effective cleaning of the fire-brick regene-'
rators and other internal parts of such stoves while they are in use and for
maintaining an uniform temperature of the hot blast.
The improvements constituting our invention consist (1) in providing in con-
nection with each compartment into which, for the purpose set forth in our prior
Specification above referred to, the stove or its regenerator is divided, one or more
blast valves and inlets by means of which the blast may be so regulated that a
practically uniform high temperature may be maintained during the time that the
stove is on blast, and whereby the dust carried into the stove and that deposited
on the heating surfaces during combustion of the gas or other fuel in firing the
stove may be periodically expelled, (2) in combining the above described separate
blast valves and inlets with the external valves to each compartment of the stove
as described in our prior Specification above referred to and that with or without
any "internal" valves of the kind set forth in the said Specification and (3) in the
application to Cowper's; Whitwell's; and other forms of regenerative hot-blast
stoves of the foregoing improvements and of the system of dividing the stoves
into compartments described in the aforesaid Specification.
In the accompanying drawings which illustrate our invention figures 1, 2 and 3
on sheet 1, are respectively an elevation, a vertical section and a horizontal section
showing the application of our improvements to a regenerative hot-blast stove of
the kind described in. our Specification No.3897 of 1882. Figures 4 and 5, are
respectively a vertical section and a horizontal section showing the lower part of a
modified form of our hot-blast stove without internal valves but having the
arrangement of combustion chamber described in our former Specification in
combination with the use of separate blast valves and inlets and external valves to
DJ1
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page_text: each compartment. Figures 6 and 7 are vertical sections at right angles to each
other of the lower part of a "Cowper's" stove having our improvements applied
thereto and figure 8 is a horizontal section of the same. Figures 9 and 10 are
vertical sections at right angles to each other of a "Whitwell" stove embodying
our improvements and figures 11 and 12 are horizontal sections of the same at
different lines. As represented in these drawings the stove under its several
modifications comprises the usual internally lined casing A, which is provided with
a combustion chamber B, and a series of regenerators C, of any of the well known
forms, the stove being in each case divided into compartments by means of vertical
walls D, which extend to the top of the regenerators excepting when the regene-
rators are themselves composed of vertical walls in which case as hereinafter
mentioned the walls D extend only to the under side of such regenerators. The
gaseous fuel which by combustion serves to heat the regenerators is admitted by a
valve E, and ports e to the combustion chamber B, whereinto the necessary air is
admitted by a valve F, and ports f, in the usual way. The hot products resulting
from combustion of the gas pass upwards to the top of the chamber B and descend,
as indicated by the arrows, through the regenerators C, C, and thence pass by an
outlet flue G to the chimney, the internal valves H when such are provided as
shown in figures 1, 2 and 3, in connection with each compartment of the stove and
the external valve I, being then open, or the separate external valves I, provided
to each compartment when there are no internal valves, as in figures 4 to 12, being
opened. After firing, the gas valve E, and the valves H and I are closed and one,
two or more of the air blast admission valves J, of which a separate one is provided
for each compartment of the stove, are opened and the air flowing in through the
inlets j, passes as indicated by the darts, upwards through the regenerators, down
through the upper part of the combustion chamber B, and thence by an outlet K,
which in the stoves figures 1, 2, 3, 4 and 5 may be on either or on both sides of
the stove, to the tuyeres of the blast furnace. In the stove represented by figures 1,
2 and 3, internal valves H are provided and are operated by hand from the outside
as described in our former Specification. The air-blast valves J and external
valve I, which are of ordinary construction may be operated by hand levers or
otherwise, while the gas inlet valve E, and the main outlet valve 1¹, may be
operated by racks and pinions and hand cranks or by similar means. In the stove
shown in figures 4 and 5, the internal valves are dispensed with and the lower part
of the inlets j, for the air-blast from the valves J also serve as the outlets for the
products of combustion and for the expulsion of the dust or deposit when the
external valves I which are fitted in branches leading to the chimney flue G, are
opened. In the improved "Cowpers" stove represented in figures 6, 7 and 8, the
air-blast valves J and external valves I are similarly arranged in connection with
the inlets ;, the series of valves being conveniently fitted at one side of the stove
owing to the arrangement of the compartments into which the stove is divided by
the parallel walls D, while the hot blast discharge pipe K and the gas admission
valve E are fitted at the opposite side of the stove. The walls D, which are built
under the regenerators have a coping formed by girders D¹, D³, which are wedged
close up to the under side of the grids or supports of the regeneratora. In the
modified form of "Whitwells" stove represented by figures 9, 10, 11 and 12, the
division walls D are built up to meet the lower ends of the vertical walls of
the regenerator in order to divide the stove into compartments, the transverse
walls D³, serving for further subdivision in lieu of the combustion chamber which
serves the like purpose in the forms of stoves shown in figures 1 to 5. Separate
air-blast valves J and external outlet valves I are provided fore each compartment,
the valves for the two central compartments being for convenience fitted on opposite
sides of the stove. The building up of the division walls D in the "Cowper" and
"Whitwell" forms of stove may be effected in the manner described without
interfering with the existing arrangements of the regenerator.
By the employment of separate air blast valves J, and outlet valves I, for each
compartment of the several forms of hot blast stoves described the pressure of the

page_text: air contained in the stove at the moment of its discharge on changing from blast
to gas or at any time while on blast may be supplemented or re-inforced by the
full blast pressure from the blowing engine to assist in expelling the dust and
deposit from the heating surfaces into the outlet to which the air has momentary
access by the sudden opening of the outlet valve of an adjacent compartment
whose heating surfaces are also thereby freed from deposit.
The several parts of the hot-blast stoves described may be varied as regards
form and arrangement, the internal valves shown in figures 1, 2 and 3, being for
example applicable to the stoves shown in figures 4 to 12, and the arrangement of
the blast inlet and external valves shown in these latter figures being applicable
to the stove shown in figures 1 to 3. The several improvements herein set forth
may also be applied to other forms of hot blast stoves than those represented in
the drawings.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:—
(1.) In a hot-blast stove divided into several compartments, the provision of
separate inlet blast and outlet valves to each compartment whereby a practically
uniform temperature may be maintained and the pressure of air within the stove
may be supplemented or reinforced at the moment of discharge through any one
of the compartments for the purpose of expelling the dust or deposit on the
heating surfaces, substantially as herein described with reference to the drawings
annexed.
(2.) In a hot-blast stove the arrangement in combination of blast valves and
inlets with external outlet valves to each compartment into which the stove is
divided substantially as herein described with reference to figures 4 to 12 of the
drawings annexed.
(3.) In Cowper's, Whitwells and like hot blast stoves the arrangement of vertical
walls under the regenerator so as to divide the stove into compartments, substan-
tially as herein described with reference to figures 6 to 12 of the accompanying
drawings.
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M 1000