Year: 1892

page_text: Date of Application, 7th May, 1892-Accepted, 11th June, 1892

page_text: Having described the details of our furnace, we will now proceed to explain how
the same is operated.
The chamber B having been charged with coal to the height of the lowest
perforations & Figure 1, fires are lighted in the chambers A and C, and maintained
at a height of about six inches.
Inferior quality of coal may be utilised in the middle chamber B, and refuse
coal burned in the chambers A and C, and great economy thereby obtained. The
temperature of the walls e of the chamber B is raised until the coal contained
therein gives off its gas.
This gas immediately ignites and passes through the apertures 61 to the
chambers A and C where the products of combustion are raised to a still higher
temperature and more thoroughly ignited.
After passing through the apertures b. the heated gases circulate through the
vertical passages d³ and d Figure 3, and the horizontal passages de Figure 1
which have also attained a high temperature heating the exposed front plate of the
boiler, and then finding an exit through the boiler flue. In this manner the
chambers A. B and C attain a high degree of temperature, where the liberated
gases are more thoroughly ignited than if they came into immediate contact with
the relatively cool plates of the boiler.
Figures 7. 8 and 9 shew our invention as applied to the interior of an ordinary
boiler flue when there is not a convenient space for the chambers A. B and C.
e are the firebars, and et is the firebridge. E is a lining of firebrick or other
suitable non-combustible material having perforations or apertures e³, and its lower
extremities resting upon the firebars e; this lining has an external diameter slightly
less than the interior of the flue, thus leaving a space e¹.
F, Figures 7 and 9 is a firebrick baffle having apertures e so arranged as to
allow the gases to pass more freely through the lower than the upper part of the
same.
In this arrangement of our invention the firing is performed as in the ordinary
manner with internally flued boilers, when the lining E becomes intensely heated
and thereby thoroughly ignites the heated gases before they come into contact with
the plates of the boiler flue. These gases afterwards circulate through the
apertures and along the space e¹ until they reach the baffle F where they are
broken up.
The restricted exit at the upper part of this baffle causes a portion of
the said gases to descend and heat the lower plates of the flue. The combined
areas of the apertures e are slightly less than the area of the space above the
firebridge et.
Where convenient we prefer to have an exterior furnace as previously described
herein, leaving the whole interior surface of the flue and a portion of the end plate
of the boiler to be used as heating surface, but the exterior furnace may be con-
structed without chamber B thus making the compartments A. B and C into one
furnace with the whole wall next to the boiler perforated with apertures
as shewn
in chambers A and C. The length, breadth, and heighth of the furnace depend on
the class of boiler to which it may be applied, and it will be evident that the
furnace may be placed underneath the boiler more especially when the boiler is
outwardly fired.
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 :-
1. In a steam boiler furnace, the combination of chambers such as A. and C
Figures 1. 2 and 3, having a wall with perforations such as b and a chamber such
as B having walls with perforations such as 6¹ and passages such as d d and d
with a steam boiler D as and for the purposes substantially as described herein
and illustrated in the accompanying drawings.
2. In a steam boiler having an internal flue, the combination of the lining E
Figures 7 and 8 made of firebrick or other suitable non-combustible material

page_text: having apertures and external space e¹ with the baffle F having apertures e³, as
and for the purposes substantially as described herein and illustrated in the
accompanying drawings.
3. In a steam boiler furnace such as described herein, a firebrick shaped as shewn
in Figures 4. 5 and 6 having points d³, and scallops d'as and for the purposes,
substantially as described herein and illustrated in the accompanying drawings.
Dated this 6th day of May 1809
EDWARDS & Co.,
35, Southampton Buildings, London. Agents for the Applicants.