Year: 1888

page_text: Date of Application, 9th Feb., 1888
Specification Accepted, 9th Mar., 1888
PACE CARE vers,
I, WILLIAM THOMLINSON, of West Hartlepool, in the County of Durham, Iron
Master, 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 the flues of regenerative chambers through which hot gas
is passed in currents which may be changed in direction when transmitted from
flue to flue, such as in the regenerative chambers of hot blast stoves.
In regenerative chambers as at present constructed I have discovered it to be a
great defect to construct the flues with straight sides or walls from ond to end,
by which every entrance and outlet is in the form of a regenerative chamber divided
by a flat division wall, in consequence of which the travel of gas on issuing from one
flue and entering another with the direction of the current is obstructed by snch flat
division walls and the particles of dirt or scoria with which it is charged are inter-
cepted by them, so that an accretion is formed on the brickwork which partially closes
up the flues and causes constant trouble and expense.
The object of any invention is to overcome this difficulty by providing what may
be termed bell mouthed Blues which reduce to a minimum the obstruction to the
entrance of the gas to the flues, and enable the force of the current to carry the
particles of dirt or scoria contained in the gas to where it can readily be removed at
the bottom or other part of the stove or quite out of it.
And in order that my invention may be fully understood and readily carried into
effect, I will now proceed to describe the same by referring to the accompanying
drawings in which my invention is illustrated as applied to the flues of the regenerative
chamber of a hot blast stove.
Fig. 1. is a sectional view in plan taken above the chequer work; Fig. 2. is a
sectional view of the top of the chamber taken along line X X of Fig. 1; Fig. 3.
illustrates in plan and to an enlarged scale the mouths of several flues arranged
together in the manner usual in a hot-blast stove; the other figures simply representing
specimens of bricks or blocks for forming the bell mouths illustrated in Figs. 1, 2,
nud 3.

page_text: Instead of constructing the flues with the inside surface or walls extending without
deviation from the straight line from end to end, and which is found to cause so much
trouble by intercepting the dirt or scoria with which the gas is charged, I cause each
side of the flue to diverge at a suitable distance from the end, as for instance twelve
to eighteen inches, so as to form what may be termed a bell mouth as is distinctly
illustrated; this may be effected by constructing the mouth or entrance of each flue
with specially shaped bricks or blocks such as those illustrated in detail in the figures,
which are moulded to suit the particular arrangement of flues illustrated in the
drawings, and are simply given as specimens applicable for the purpose of carrying out
my invention under certain conditions, as the mouths of the flues may be made to
diverge or become bell mouthed by any suitable means and may be varied. according
to circumstances.
In the regenerative chambers of hot-blast stoves the flues are usually vertical and
would be bell mouthed at top and bottom, but this improvement in the construction of
the flues is applicable whatever be the position of the flues. The distance which the
divergence of the sides extends into the flue may be varied according to circumstancos,
but a distance of from twelve to eighteen inches has been found to give good results.
Having now described the nature of my invention and in what manner the same is
to be performed, what 1 claim is :-
In the construction of flues of regenerative chambers through which hot gas is
passed in currents which are transmitted from flue to flue, the employment of
diverging or bell mouthed ends, substantially as and for the purpose as herein before
described.