IMPROVEMENTS IN OR CONNECTED WITH FURNACES FOR SLOW COMBUSTION BOILERS AND OTHER HOT WATER APPARATUS
Year: 1884

page_text: CHARLES PATULLO KINNELL Engineer of 31 Bankside Southwark S.E. in the
County of Surrey and GEORGE ROTHNIE Engineer of 21 Elthorne Road Upper
Holloway in the County of Middlesex do hereby declare the nature of our
Invention for IMPROVEMENTS IN OR CONNECTED WITH FURNACES FOR SLOW
COMBUSTION BOILERS AND OTHER HOT WATER APPARATUS to be as follows:-
The apparatus constructed according to the said Invention, has special reference
to the fire grate and front fittings required for slow combustion and other boilers,
having a semicircular, U, or horse-shoe form on their vertical section or plan. The
front plate or casting may be made of one or more pieces as may be found
necessary, having openings made in the same, of suitable size and fitted for the
following purposes:-One near the top for the supply of fuel and also for the escape
of the products of combustion.
Another below this for the admission of air to the fire by means of a flue.
And a third or bottom door for admitting air when required, and also for the
removal of clinkers or ashes, and for inserting and using a lever or poker to turn or
otherwise move the grating on its axis. (All these openings are fitted with covers
or some form of doors.)
Between the middle and lower openings mentioned a flue is constructed either by
casting the front in that portion hollow, or by means of an inner plate fitted for
that purpose on the front casting, or tubes may be used side by side for the heating
chamber or flue as may be desired.
The grating is made of a similar shape to that of the inside of the boiler
(see Plan) and is made to turn in a vertical direction on pivots, these being fitted
sufficiently forward to cause the grate to fall in a sloping direction towards the
back of the boiler and rest on the inner side of the flue casting or plate, while the
other end will terminate near the bottom of the boiler,
By this inclined position of the grate, it will be seen that the fire must act
directly at the bottom of the boiler, and at a point where it is most required, giving
also greater depth to the fuel space there, the grate is made with its openings near
the back viz., at or near the said bottom and so as to cause combustion in the fire
at that part. A hole is made in the front of the grate and fitting into this a piece
of iron or poker, can be introduced as a lever to turn it when required (viz., when
lighting the fire or clearing out the clinkers ashes &c.).
In order that the said Invention may be fully understood, we shall proceed
more particularly to describe the same, and for that purpose shall refer to the
several Figures on the annexed Sheet of Drawings. Same letters of reference
indicating corresponding parts in all Figures,

page_text: Figure 1 of the accompanying Drawing is a front elevation of an apparatus
constructed according to this Invention.
Figure 2 shows a vertical section of the same taken on the line 1-2 on Fig. 3.
While Figure 3 shows a horizontal section or plan on line 3-4 Fig. 2.
The smoke box and feeding hopper are shown by the letters A A.
The flue or hot air chamber by the letters B B.
And the grating by C. C. when in use and position, while C₁ C' shows the same
when drawn down when lighting or clearing out the fire.
A boiler D (of one of the forms mentioned) is shown on the plan 3. and
section 2. to illustrate more fully the application of this Invention to boilers of that
class. It will be seen from the said Drawings that the upper or top opening is
fitted with a projecting mouthpiece E having a pipe F on the upper side for the
escape of smoke and other gases into the chimney.
The opening E itself being adapted for the supply of fuel for the boiler as well.
The lid (by preference) covering the same to be made as shown viz. :-in the
form of a sliding pan or shovel, see dotted lines G. G.
The opening at the bottom H H forming the front of the ash-pit is provided
with a closely fitting door or cover I. I. and is made to prevent the air from
entering at that point except when a quick draught is necessary.
The middle door K opens into the flue L and forms the upper end of the said
flue; while the lower end of this terminates in the ash-pit under the grate. The
air admitted in this manner becomes heated before reaching the fire, having to
descend through a highly heated flue or chamber and also under the solid front
part of the hot grating.
The grate is made to fit and closely shut against the inner side of the flue, a clear
space being left in front of the grate in order to admit air freely into the ash-pit
from the external opening at K and thereby afford a continuous supply of highly
heated air into the fire, heated air thus introduced not only economizes fuel but
likewise keeps the same alight much longer.
The flue is arranged so that it conveys the heated air (which otherwise would be
wasted) directly into the fire and at the same time helps to keep the plate forming
the outer front of the boiler cool..
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 for an Invention of improvements in or connected with furnaces for
slow combustion boilers and other hot water apparatus, and that the said
improvements consist,
1st In the improved method of fixing or otherwise fitting the fire grate and
constructing the same.
2nd In a method of supplying heated air into the fire by means of a flue made in
front of the boiler, and
3rd In the smoke box and feeding hopper combined substantially as herein before
described.
These improvements being as heretofore described and illustrated in the
accompanying Drawings.
Dated this Twenty first day of July 1884.
CHARLES PATULLO KINNELL..
GEORGE ROTHNIE..