Improvements in Furnace Blast Apparatus for Economising Fuel and Consuming Smoke in and otherwise Increasing the Steam Generating Properties of Stationary, Portable,
Year: 1885

page_text: Improvements in Furnace Blast Apparatus for Economising
Fuel and Consuming Smoke in and otherwise Increasing
the Steam Generating Properties of Stationary, Portable,
I, JOHN WILLIAM HOLDEN of Ottawa Villa, Manley Road, Withington, near
Manchester, in the County of Lancaster, Engineer do hereby declare the nature
of this invention to be as follows:-
--
These improvements refer to an invention for which Letters Patent N° 1460
were granted to me the 3rd day of February 1885, and have for their particular
object the rendering of a modification of the same apparatus applicable to the
furnaces of that class of steam boiler in which a single jet of steam and air on
my improved principle is not found sufficient. to entirely consume the smoke and
economise the fuel.
In performing my present invention I employ two or more steam and air jets
which are disposed as follows:-I divide the air draught pipe as it enters the
boiler furnace into two or more branches and spread them out sideways and then
carrying them forward in a parallel manner in the direction of the length of the
boiler and at the right angles or bends there formed-I introduce my improved
steam jet so as to project say a sixteenth of an inch into the parallel portion of
such branch pipes and which thus constitute the tue irons or ejector pipes of my
original arrangement.
1
In this manner I obtain two or more jets of steam and air combined which
I find much more effective than single jets,-in consuming, smoke, economising fuel
and increasing the steam productive power of boilers. For some description of
boilers I carry the air draught pipe along the front or sides of the furnace and
admit air at one or both ends of these pipes and from the sides of these pipes
I have projecting branches or ejector pipes each of which is supplied with my
improved steam jet-or I employ ejector pipes and steam jets at each of the four
corners of the furnace.
In cases where the products of combustion are carried off in a vertical direction
from the furnace I prefer to incline the ejector-pipes slightly in the same direction.
I sometimes close in the ash pit and employ my improved steam jet and ejector
pipe in supplying the necessary air to the ash pit and either admit all the air
necessary to support combustion in this manner or I employ the same in com,
bination with my appliance above the fire.

page_text: Improvements In Furnace Blast Apparatus for Economising
Fuel and Consuming Smoke in and otherwise Increasing
the Steam Generating Properties of Stationary, Portable,
Locomotive, Marine, and other Boilers.
I JOHN WILLIAM HOLDEN of Ottawa Villa, Manley Road, Withington near
Manchester, in the County of Lancaster, Engineer do hereby declare the nature
of my Invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
These improvements refer to an invention for which Letters Patent N° 1460
were granted to me the third day of February 1885 and have for their particular
object the rendering of a modification of the same apparatus applicable to the
furnaces of that class of steam boiler in which a single jet of steam and air on my
improved principle is not found sufficient to entirely consume the smoke and
economise the fuel.
In performing my present invention I employ two or more steam and air jets
which are disposed as follows:-I divide the air draught pipe a (as indicated
in Fig. 1) as it enters the boiler furnace into two or more branches b and sprend
them out sideways inside the furnace as illustrated and then carry them forward
in a parallel manner in the direction of the length of the boiler and at the right
angles or bends there formed I introduce my improved steam jets c so as to
project say a 16th of an inch into the parallel portion of such branch pipes and
which thus constitute the tue iron or ejector pipes of my original arrangement.
In this manner I obtain two or more jets of steam and air combined which
I find much more effective than single jets-in consuming smoke economising fuel
and increasing the steam productive power of boilers. For some description of
boilers I carry the air draught pipe along the front or sides of the furnace and
admit air at one or both ends of these pipes and from the sides of these pipes
I have projecting branches or ejector pipes each of which is supplied with my
improved steam jet or I employ ejector pipes and steam jets at each of the
corners of the furnace.
In Fig. 2. I illustrate a front view in Fig. 3 a plan and Fig. a sectional plan of
the application of three steam and air jets on my improved principle to a boiler
furnace and which in this case are situated over the furnace door.
In all the views a a are the air chambers receiving their supply of air from the
outer atmosphere through the branch pipes 6 b and controlled by the sliding
dampers c c which I prefer to clamp together as indicated in Fig.
so as to open
and close simultaneously.
Through these chambers pass the steam jet pipes d d which receive their supply
of steam from one common steam chamber d¹ but for this purpose separate steam
pipes might be employed.
Although three chambers are here illustrated and described it will be obvious
that more or less than three could be employed according to the special require-
mente of the furnace.

page_text: In Fig. 4 I represent a side sectional view in Fig. 5 a plan and in Fig. 5* a front
view of a modification in which there is a single air chamber e from which project
a series of smaller steam and air jets finto the furnace. The steam being shewn
supplied to the common air chamber f¹. This arrangement being useful where
the space above the furnace door is limited.
In cases where the products of combustion are carried off in a vertical direction
from the furnace I prefer to incline the ejector pipes slightly in the same direction.
In Fig. 6 I shew the application of my improvements to the furnace of a vertical
steam boiler and which consist of a central hollow standard h around which the
fire bars are supported as illustrated this hollow standard receiving its supply of
air from the ash pit i through the side opening ; and being provided with my
improved steam jet k as illustrated.
The mixture of steam and air escaping into the furnace through side openings
and through the perforated inverted cone m.
In Fig. 7 I illustrate my improvements applied to a locomotive furnace and
which consist of an air supply pipe n running beneath the ash pit o and open at
both extremities two or more air branch pipes n¹ provided with internal steam
jets n as indicated by the dotted lines. This air supply pipe is arranged to be
closed at one of its extremities (either back or front according to the direction in
which the engine is running) whilst the other end is open by a pair of flap p
connected together by a rod q and controlled by the operating handle r.
I sometimes close in the ash pit as indicated by front view in Fig. 8 and side
sectional view in Fig. 9 and employ my improved steam jet and ejector pipe 8 in
supplying the necessary air to the ash pit t through air draught or ventilating
pipes 8' but I always employ the same in combination with my appliance above
the fire.
We find in practise that it is advisable to thus divide the steam and air jets (as
hereinbefore described) over the entire surface of the furnace and so to ensure
that each atom of gas arising from the incandescent fuel shall receive its due and
proper quantity of oxygen to obtain perfect combustion.
It will be obvious that instead of steam compressed air where conveniently
obtainable may be employed with this our improved apparatus and this is
particularly advantageous where used for ventilating purposes.
Having thus particularly described and ascertained the nature of this my
said Invention and in what manner the same is to be performed I declare that
what I claim is :-
1st The general arrangement and combination of blast apparatus for consuming
smoke and economising fuel in steam boiler furnaces substantially as herein before
described and illustrated on the accompanying drawing.
2nd The employment of two or more of my improved steam and air jets and
various applications of the same substantially as and for the purposes herein before
described and illustrated on the accompanying drawing.
1
1000
JOHN G. WILSON,
Agent for the Applicant.