Improvements in Heating Devices for use especially in Heating the Forced, Induced, or other Draught of Steam Boilers and the like.
Year: 1892

page_text: Date of Application, 25th Oct., 1892
Complete Specification Left, 5th June, 1893-Accepted, 22nd July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Heating Devices for use especially in Heating
the Forced, Induced, or other Draught of Steam Boilers and the
like.
I, JAMES MACKENZIE of Glenthorne, 8 St. Alban's Road, Bootle in the County
of Lancaster, Mechanical Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to an improved method and means for heating the air
supply from the waste heat of the furnace gases. The method consists in drawing,
forcing, or otherwise passing the incoming air through annular spaces formed of two
tubes, the inner surface of the inner tube, and the outer surface of the outer tube
One or both of these
being exposed to the waste gases in the uptake or funnel.
tubes can be provided with ribs to increase the heating surface. One mode of
carrying out my invention applicable for an ordinary marine boiler is as follows:-
Immediately above the tubes in the tube plate I place one or more boxes and high
up in the uptake or smoke box or its equivalent I place a second series of boxes
into which the air to supply the furnace is passed. A series of tubes pass through
both these boxes and so carry the products of combustion that have passed through
the boiler tubes to or near the upper part of the uptake. Surrounding and concentric
with each of these tubes I place another tube opening into each of the two boxes,
its outer surface being freely exposed to the gases from the boiler tubes which pass
round the lower set of air boxes in their passage up to the funnel. The air boxes
have two outer tube plates supplied with small holes for the inner pipes and two
other tube plates facing each other into which the larger or outside tubes are fitted.
In thus describing this special form of apparatus I do not wish to bind myself to it
as it is obvious that in many instances the annular tubes could be placed diagonally
or horizontally instead of vertically.
aul
Antahan 1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Heating Devices for use especially in Heating
the Forced, Induced, or other Draught of Steam Boilers and the
like.
I, JAMES MACKENZIE of Glenthorne, 8 St. Alban's Road Bootle, in the County
of Lancaster, Mechanical Engineer 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:―
This invention relates to an improved method and means for heating the air
supply from the waste heat of the furnace gases. The method consists in drawing,
forcing or otherwise passing the incoming air through annular spaces formed of
two tubes, the inner surface of the inner tube, and the outer surface of the outer
tube being exposed to the waste gases in the uptake or funnel. One or both of
these tubes can be provided with ribs to increase the heating surface.
One mode of carrying out my invention applicable for an ordinary marine
boiler is illustrated in the accompanying drawings, in which
Figure 1 is a part front view and part section, Figure 2 a transverse section of
my apparatus showing it as applied to an induced draught,
Figures 3 and 4 similar views of apparatus with forced draught.

page_text: In these, immediately above the tubes in the tube plate is placed one or more
boxes A. and higher up in the uptake or smoke box a second box or series of
boxes B into which the air to supply the furnace is passed. A series of tubes C
pass through both these boxes and so carry the products of combustion that have
passed through the boiler tubes to or near the upper part of the uptake.
Surrounding and concentric with each of these tubes I place another tube D
opening into each of the two boxes, its outer surface being freely exposed to the
gases from the boiler tubes which pass round the lower set of air boxes.in the ir
passage up to the funnel. The air boxes have two outer tube plates E F supplied
with small holes for the inner pipes, and two other tube plates GH facing each
other into which the larger or outside tubes are fitted. I is the fan forcing or
inducing the draught. It is obvious that a steam jet or equivalent forcing device
could be used in lieu of a fan. In Figures 1 and 2, the forcing device is inducing
a draught and acts on the products of combustion after passing the heater.
Figures 3 and 4, it acts on the air, forcing it through the heater to the furnace.
K is a damper or valve in the uptake.
In
In thus describing this special form of apparatus, I do not wish to bind myself to
it, as it is obvious that, in many instances, the annular tubes could be placed
diagonally or horizontally instead of vertically.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
1. The herein described improvements in heating devices for the purposes
described, whereby the air for the blast is passed through annular tubular spaces,
the inner and outer walls of which are both exposed to the products of combustion.
2. The general arrangement of heating devices for use especially in heating the
forced induced draught of steam boilers and the like, substantially as herein
described and illustrated.
1000
WM. P. THOMPSON & Co.,
.
Of Liverpool, Manchester, Nottingham,,and London,, Patent. Agents.