Improvements in Sectional Hot Water Boilers.
Year: 1899

page_text: Date of Application, 21st Apr., 1899
Complete Specification Left, 18th Jan., 1900-Accepted, 24th Feb., 1900
Improvements in Sectional Hot Water Boilers.
I, JAMES KEITH, Assoc.M.Inst.C.E., of 27, Farringdon Avenue, in the City of
London, Gas, Hydraulic, Heating and Ventilating Engineer, do hereby declare
the nature of this invention to be as follows:-
This invention relates to sectional hot water boilers for use chiefly in heating
buildings by circulation of the heated water through piping, and it has for its
object to provide in combination with such boilers a separate furnace or fuel
chamber preferably having auxiliary water heating surface and so arranged that
the main boiler is heated by the fire gases passing through it from the fuel cbámber
and impinging upon its heating surfaces.
The main portion of the boiler is preferably of the vertical sectional type
described in the Specifications of my Patents Nos. 2709 of 1879 and 5744 of 1885
but it may be of the horizontal formation described in the Specification of my
Patent No. 3013 of 1887 or of other type, but in each case the fire grate is
removed and a closed gas combustion chamber takes the place of the fuel space,
the said chamber being surrounded by fire bricks and having a fire brick bottom.
Alongside of the main boiler is fitted an auxiliary water heater containing the
fuel chamber or magazine, the said heater being either made in a single piece
or in sections corresponding to those of the main boiler and so formed that the
fuel is enclosed centrally by a water jacket. The fuel is fed in at or near the
top through a doorway and rests on a rocking or other fire grate fitted in a
hollow base at the bottom. The fire gases instead of passing up through the
body of fuel in the fuel chamber are led through a passage which is fitted to con-
nect the auxiliary heater to the main boiler and pass into the combustion chamber
whence they ascend and, after parting with their heat by impinging against the
heating surfaces of the boiler, escape by a chimney at the upper or farther end
of the boiler. The water space or jacket around the fuel chamber is connected
to that of the boiler or to the main flow and return pipes from boiler by separate
flow and return pipes.
The boiler proper is heated solely by the hot gases from the fire in the fuel
chamber or magazine of the auxiliary heater and thus contact of fuel and forma-
tion of ash in the main boiler is avoided, whilst as the draft in the fuel chamber
is downwards perfect combustion is ensured, as well as economy in fuel and
absence of smoke.
The separate magazine may also be of such dimensions that firing once a
day may suffice. The said magazine may be formed without having the water
jacket round it and without the accompanying circulating pipes mentioned.
The sections of the main boiler above the combustion chamber are or may be
all formed with cross tubes to provide a maximum of heating surface, and access
to these for cleaning may be had by providing the usual doors in the sides of
the boiler. Clinker and ash doors are also provided for the furnace or fire-grate
of the auxiliary heater and air registers may also be provided in the general

page_text: base for regulating the admission of air to the fire grate through the boiler base.
The air register or registers may be opened or closed by hand or it or they may
be automatically operated through mechanical devices acted on by the rising and
falling of the temperature of the water or of the air of the apartments heated by
the boiler.
Dated this 20+1
1 1000
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
2, Saint Vincent Street, Glasgow, Agent for the Applicant.
improvements in Sectional Hot Water Boilers.
I, JAMES KEITH, Assoc.M.Inst.C.E., of 27, Farringdon Avenue, in the City of
London, Gas, Hydraulic, Heating and Ventilating 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 sectional hot water boilers for use chiefly in heating
buildings by circulation of the heated water through piping, and it has for s
object to provide in combination with such boilers a separate furnace or fuel
chamber preferably having auxiliary water heating surface and so arranged that
the main boiler is heated by the fire gases passing, through it from the fuel chamber
and impinging upon its heating surfaces.
The invention is illustrated by the accompanying drawings, Fig. 1 being a
vertical section, and Fig. 2 a plan of the improved sectional hot water boner.
Fig. 3 is an elevation in section of the boiler shown in Fig. 1, but showing a
modified form of the furnace portion of said boiler.
The main portion a of the boiler is preferably of the vertical sectional type,
but it may be of the horizontal formation or of other type, but in each case the
fire grate is removed and a closed gas combustion chamber b takes the place
of the fuel space, the said chamber 6 being surrounded by fire bricks b and
having a fire brick bottom 62. Alongside of the main boiler a is fitted an
auxiliary water heater containing the fuel chamber d or magazine, the said
heater being either made in a single piece and tapered, as shown at Fig. 3,
or in sections with parallel sides corresponding to those of the main boiler a,
as shown at Fig. 1, and so formed that the fuel is enclosed centrally by a water
jacket c. The fuel is fed in at or near the top through a doorway e and rests
on a rocking or other fire grate f. fitted in a hollow base g at the bottom.
The fire gases instead of passing through the body of fuel in the fuel chamber d
are led through a passage or flue h, which is fitted to connect the auxiliary
heater to the main boiler a and pass into the combustion chamber 6 whence
they ascend and, after parting with their heat by impinging against the heating
surfaces of the boiler a, escape by a chimney i at the upper or farther end of
the boiler. The water space or jacket c¹ around the fuel chamber d is connected
to that of the boiler a, or to the main flow and return pipes from boiler by
separate flow and return pipes j, k, as shown at Figs. 1 and 2. The heater c
instead of being connected as above described may have its upper and lower ends
connected by a separate flow and return pipe, as shown at Fig. 3.
The boiler proper a is heated solely by the hot gases from the fire in the

page_text: fuel chamber d or magazine of the auxiliary heater c and thus contact of fuel
and formation of ash in the main boiler a is avoided, whilst as combustion in
the fuel chamber d is downwards, and the draft through the fire bars and lower
part of the fuel and in the main boiler u is upwards, perfect combustion is
ensured, as well as economy in fuel and absence of smoke.
The separate magazine may also be of such dimensions that firing once a
day may suffice. The said magazine may be formed without having the water
jacket round it and without the accompanying circulating pipes mentioned.
The sections a¹ of the main boiler a above the combustion chamber b are or
may be all formed with cross tubes a² to provide a maximum of heating surface,
and access to these for cleaning may be had by providing the usual doors in the
sides of the boiler. Clinker and ash doors l, m, are also provided for the furnace
or fire-grate of the auxiliary heater c and air registers n may also be provided
in the general base for regulating the admission of air to the fire grate through
the boiler base. The air register n or registers may be opened or closed by
hand or it or they may be automatically operated through mechanical devices acted
on by the rising and falling of the temperature of the water or of the air of the
apartments heated by the boiler.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. A sectional hot water boiler constructed and arranged substantially as
described.
2. The combination with a main hot water boiler composed of water-containing
sections jointed together and enclosing a central combustion chamber having a
fire brick bottom, of an auxiliary water-jacketed heater or furnace having a
central fuel space provided at its upper end with a firing door and at its lower
end with a fire grate, the fuel space of the heater being connected with the
combustion chamber of the main boiler by means of a flame flue or passage, sub-
stantially as described.
T
1000