Improvements in Hot Water Circulating Boilers for Heating Buildings or Boiling Liquids and in Furnaces therefor.
Year: 1892

page_text: Date of Application, 8th July, 1892-Accepted, 27th Aug. 1892
COMPLETE SPECIFICATION.
Improvements in Hot Water Circulating Boilers for Heating
Buildings or Boiling Liquids and in Furnaces therefor.
I, ROBERT RENTON GIBBS, of Saint James Works, Mill Street, Liverpool, in
the County of Lancaster, Heating 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 has for its object improvements in hot water circulating boilers
for heating buildings or boiling liquids.
My improved boilder is of the kind used for high pressure heating apparatus
and of the type known as sectional boilers, that is having its heating surface built
up of several independent sections which are usually of standard dimensions_and
power, just so many sections being used as the work to be done may require. Each
section consists of a tube bent in a zig-zag form and of a total length of about
80 feet, but owing to the great difficulty of obtaining tubes of such length it has
been customary to joint them together in lengths of about 15 feet with the joints
inside the furnace subject to the action of the heat and flames thereby making the
joints very liable to leakage and at a point where they are not accessible for
repair. Iso construct the boiler that all joints are outside of the furnace where
they are not under the action of the heat and flames and where, moreover, they
can be seen and are very accessible for repairs. I also construct the sections in
such manner that any sub-section can be withdrawn without disturbing the others
and without having to take down much brickwork.
The walls of the furnace are constructed with a hollow space or spaces through
which, when sufficiently heated, I pass a portion of the air necessary for complete
combustion and after it has become highly heated by contact with the red hot
brickwork of the furnace, I admit it into the combustion chamber at a point just
over the burning fuel where it meets with the escaping carbonic oxides con-
verting them into carbonic acid by supplying the second molecule of oxygen at
the proper time and place and at a temperature sufficiently high for chemical
combination. My boiler is therefore regenerative.
In order that my said invention may be most fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
Figures 1 and 2 are front and back elevations and
Figures 3, 4, and 5 are sectional elevations and
Figure 6 a sectional plan of a hot water boiler constructed according to my
invention.
The drawings represent a 10 section boiler, each section being again subdivided
into five subsections.
The same letters apply to the same parts of the boiler.
A A are sections formed of iron or other metallic tubing formed of sub-sections
having their junctions at B B outside the furnace away from the action of heat and
flame.
.
CC are the hollow spaces left inside the walls of the furnace D.
E is the inlet for the air and
FF are the outlets into the furnace for the hot air above the fuel.
G is the ash pit and
H is the smoke stack.
The direction of the products of combustion is indicated by the small arrows.
In the upper part of the smoke stack I leave an opening, Í, from the combustion
chamber closed with a damper, so that when first lighting up the fire the smoke can
escape direct into the stack until sufficient heat and draught are developed to draw
37

page_text: the products of combustion downwards, when I close the damper communicating
directly with the fire and the flames then descend and take the course shown by the
small arrows.
'
L
The air passing through the hollow spaces of the furnace walls is made to
descend one space, ascend another and so on in a zig-zag manner so as to bring
it into intimate contact with the heated walls.
SS are soot doors for cleaning out the flues and pipes.
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 improvements in sectional boilers, substantially as set forth, whereby
they are more durable and more easily repaired.
2. The arrangement of flues and air passages, whereby the furnace is made to a
considerable extent regenerative and the working quicker and more uniform, sub-
stantially as described.
Dated this 6th day of T1 1000
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.