IMPROVEMENTS IN APPARATUS FOR UTILISING THE WASTE HEAT ESCAPING FROM THE FLUES OF STEAM BOILERS
Year: 1883

page_text: LETTERS PATENT to William Hall of Cardiff in the County of Glamorgan
Fitter for an Invention of IMPROVEMENTS IN APPARATUS FOR UTILISING THE
WASTE HEAT ESCAPING FROM THE FLUES OF STEAM BOILERS
PROVISIONAL SPECIFICATION left by the said William Hall at the Office
of the Commissioners of Patents on the 2nd January 1883.
WILLIAM HALL, of Cardiff, in the county of Glamorgan, Fitter, "IMPROVEMENTS
IN APPARATUS FOR UTILISING THE WASTE HEAT ESCAPING FROM THE FLUES OF
STEAM BOILERS."
This invention is designed to provide a simple cheap and efficient apparatus, or
fuel economiser for utilising the waste heat escaping from the Blues of steam
boilers for heating feed water, and though specially applicable to the class of boilers
known as the Lancashire or Cornish type, may be adapted to other kinds of steam
boilers.
It consists in an arrangement of flat iron chambers fixed at the back end of steam
boilers or between the boilers and the chimney stack in any suitable manner.
I construct these flat chambers with either plain or corrugated surfaces and
each chamber being divided into a number of passages through which the feed
water is forced on its way to the boiler. The passages are so arranged that the
water passes up and down through a series of them, a constant circulation being
thus maintained so that the water reaches the boiler at a greatly increased
temperature.
The shape and position of the water passages referred to may be varied to suit
the class of steam boilers to which the apparatus is applied.
In describing my invention as applied to an ordinary two flued Lancashire
boiler, two of these chambers are fixed in place of the wall at the back end of the
boiler and form the wall also for the back flue so that the apparatus first receives
the heat striking against it on the first return of the flue and subsequently receives

page_text: heat on the opposite side, on the final escape of the heated air or gases to the
chimney through the main back flue.
I may also use two other chambers of lesser capacity fixed at right angles to
those previously named, so as to receive heat on both sides.
All these chambers being connected the water on its way to the boiler passes
through all the passages contained therein.
The chambers may be made of wrought or cast iron or other suitable metal. I
prefer to arrange a series of scrapers kept continually moving up and down with a
reversing motion to remove any soot adhering to the surfaces of the chambers.
When the apparatus is applied to a series of boilers, I prefer to pass the feed water
through the whole series of apparatus for each boiler.
'

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Hall in the Great Seal Patent Office on the 29th June
1883.
WILLIAM HALL of Cardiff in the county of Glamorgan Fitter, IMPROVEMENTS
IN APPARATUS FOR UTILISING THE WASTE HEAT ESCAPING FROM THE FLUES OF
STEAM BOILERS
This invention is designed to provide a simple, cheap and efficient apparatus or
fuel economizer for utilising the waste heat escaping from the flues of steam boilers
for heating feed water and though specially applicable to the class of boilers
known as the Lancashire or Cornish type, may be adapted to other kinds of steam
boilers.
It consists in an arrangement of flat iron chambers fixed at the back end of
steam boilers or between the boilers and the chimney stack in any suitable
position.
I construct these flat chambers with either plain or corrugated surfaces each
chamber being divided into a number of passages through which the feed water is
forced on its way to the boiler.
1
The passages are so arranged that the water passes up and down through a
series of them a constant circulation being thus maintained so that the water
reaches the boiler at a greatly increased temperature.
The shape and position of the water passages referred to may be varied to suit
the class of steam boilers to which the apparatus is applied.
In describing my invention as applied to an ordinary two flued Lancashire
Boiler, two of these chambers are fixed in place of the wall at the back end of the
boiler and forin the wall also for the back fue so that the apparatus first receives
the heat striking against it on the first return of the Blue and subsequently receives
heat on the opposite side, on the final escape of the heated air or gases to the
chimney through the main back flue.
I may also use two other chambers of lesser capacity fixed at right angles to
those previously named so as to receive heat on both sides.
All these chambers being connected, the water on its way to the boiler passes
through all the passages contained therein.
I
The chambers may be inade of wrought, or cast iron, or other suitable metal.
also arrange a series of scrapers kept continually moving up and down with a
reversing motion to remove any soot adhering to the surfaces of the chambers.
When the apparatus is applied to a series of boilers I prefer to pass the feed
water through the whole series of apparatus for each boiler.
And in order that my invention may be properly understood and carried into
practical effect I have caused to be annexed to this Specification the accompanying
sheet of drawings to the figures and letters of reference thereon indicated 1
now refer.
Fig. 1 is an elevation of the fuel economizer fixed at the back of the boiler, the
brick work being removed.
Fig. 2 is an end elevation of the same.
Fig. 3 a vertical section through a heating chamber.
Fig. 4 a plan of the apparatus.
As shewn I have arranged the apparatus so as to form the division plate between
the end of the boiler and main flue.
A. A are the flat (plain or corrugated) boxes or chambers divided by partitions B B
arranged as in Fig 3. The water or other liquid to be heated flows through

page_text: union C¹ to the chamber and escapes by union C as shewn by the arrows or
vice versa.
I have shewn two short boxes (forming the sides of the division plate) abutting
on the larger end chamber, the liquid traversing all three till sent to the boiler
or other receptacle in a heated state.
In arranging a series of boilers I may arrange one or more to each boiler so that
the water for each may be jointly or separately heated.
I arrange suitable scrapers (omitted in the drawings) by suitable gearing of
well known construction, to be kept in reciprocatory or endless motion to remove
the deposit of soot on the walls of the economiser.
It will be seen instead of the parallel walls of the boxes or chambers being flat
they could be constructed (for some purposes) of segmental or curved form without
departing from the principle of my invention
In constructing my economiser I prefer to cast the boxes or chambers with the
partitions thereon and then bolt or otherwise secure the separate end or back as
the case may be, or, I might arrange the partitions to be separable and fitted in the
box or chamber.
It will be seen that besides the purpose of a feed water-heater my apparatus
can be adapted for the purpose of utilizing the waste heat escaping from the flues
of steam boilers to superheat "exhaust" or "live" steam, or heat air or gases.
Having now described the nature of my said invention and the manner of
performing the same I would have it understood that I claim as my invention,
The construction of apparatus for utilizing the waste heat escaping from the
flues of steam boiler furnaces in the form of parallel or flat sided chambers having
alternating open partitions or divisions through which the water or other medium
to be heated, flows or is conducted substantially as described.
In witness whereof I the said William Hall have hereunto set my hand
and seal this nineteenth day of June in the year of Our Lord one thousand
eight hundred and eighty three.
Signed sealed declared and delivered by
the above named William Hall in the
presence of
RICH C. SPENCER
Sol and Notary Public
Cardiff
WILLIAM HALL (L.S.)