Improvements in Hot Blast Stoves.
Year: 1893

page_text: Date of Application, 2nd May, 1893-Accepted, 17th June, 1893
COMPLETE SPECIFICATION.
Improvements in Hot Blast Stoves.
We, HORACE BARLOW-MASSICKS and WALTER CROOKE, both of Millom
Iron Works, Millom, in the County of Cumberland, Blast Furnace Engineers, 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 relates to hot blast stoves and particularly to the stoves known as
Massicks & Crooke's Hot Blast Regenerative Fire Brick Stoves for which we
obtained Letters Patent numbered 1312 and dated March 24th 1881.
Our invention consists of three improvements in the construction of such stoves,
the first improvement relating to the discharge of air from the stoves by means of
dampers into any of the radial passages connected with the chimney flue, the
second improvement relating to the circulation of air so as to take up the heat
from the outer casing and wall and the third improvement relating to the
construction of the hot blast valves so that the water cooling pipes may be
cleaned of all sediment by means of rods without interfering with the working
of the valves.
And in order that our invention may be fully understood and readily carried
into effect we will describe the accompanying two sheets of drawings reference
being had to the figures and letters marked thereon.
Figs. 1 and 2 are sectional elevations and Figs. 3 and 4 are sectional plans taken
respectively on the lines V W and X Y, Figs. 1 and 2, of two of the patent hot
blast regenerative fire brick stoves to which our improvements are applied.
Figs. 5 and 6 are detail views of an improved construction of hot blast valve
which we employ according to our present improvements.
In addition to the plan of scraping the walls of our patent stoves in the manner
described in our said Specification it has been the practice in changing the stoves
from blast to gas to discharge the air through the chimney flue n, Fig. 1, or in the
case of the chimney top stove, Fig. 2, into the air through the valve band flue n,
which valve is actuated by means of a lever c, and in this way the whole of the
air is liberated from the stove and has the effect of assisting to clean the passages.
At the top and bottom of the stoves we have radial passages d, Figs. 1 to 4,
communicating with the chimney flue n, and our improvements consist in having
fixed to the mouth of each of these passages da damper e by means of which all
the air from the stoves may be directed alternately through one or all of the radial
passages d, thus more effectually assisting to expel by way of the chimney flue any
dust that may be loosely retained upon the walls.
The effect of this improvement will be to prolong the period that it will be
necessary to put down the mechanical scrapers described in our said Specification
No. 1312 of 1881 which nevertheless will be found necessary at certain periods.
The improvement in the circulation of the air in the stoves by which means the
radiant heat is taken up from the outer casing and outside course of brick work u.
In the case of the chimney top stove Figs. 2 aud 4 we admit the air between the
iron casing and the outer course of brick work a at or towards the bottom of the
stove p Fig. 2, and cause it to travel up between the casing and brick work entering
the stove at the top and then cause it to descend in the usual way through the
three pass store Figs. 2 and 4. The effect of this improvement is to absorb a
large proportion of heat that would be otherwise wasted by radiation from the
outer casing, the course of the burning gas being in the same direction as usual in
hot blast stoves of our construction. In the case of the four-pass stove, Figs. 1
and 3, the air is admitted into the casing at the top of the stove p, Fig. 1, and

page_text: passes down between the casing and the outer brick work a, Fig. 1, and then
follows the same course as described in our Specification No. 1312 of 1881.
The improvement in our hot blast valves consists in casting the water pipes y,
Figs. 5 and 6, in the valve seating in the form say of a square and not in the
circular form as shown in our said Specification No. 1312 of 1881, so that a rod
may be pushed through every part from the outside in order to remove any
incrustation.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
In hot blast regenerative fire brick stoves of the type hereinbefore indicated―
1. The herein described improvement for discharging air from the stoves by
means of dampers into all or any of the radial passages connected with the chimney
flue substantially as set forth.
2. The herein described improvement in the circulation of air so as to take up
the heat from the metal casing and outer brick work of the stove substantially as
set forth.
3. The herein described improvement consisting of constructing hot blast valves
so that the water cooling pipes may be cleaned of all sediment by means of rods
without interfering with the working of the same substantially as set forth.
Dated this 1st day of May 1893.
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicants.
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicants.