Improvements in the Arrangement and Method of Working Steam Generators.
Year: 1890

page_text: Date of Application, 8th July, 1890
Complete Specification Left, 7th Apr., 1891-Accepted, 16th May, 1891
PROVISIONAL SPECIFICATION.
Improvements in the Arrangement and Method of Working Steam
Generators.
I JOHN SMITH RAWORTH, of 112 Belvedere Road, Lambeth, in the County of
Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention is applicable to groups of two or more boilers working under
circumstances of considerable daily variations of load.
The object of my invention is to reduce the present wast of fuel in getting up
steam in several boilers, some of which may only be required to work for a few
hours daily.
In carrying my invention into effect, I arrange the flues in such a manner that
the products of combustion from one boiler may be made to pass either directly to
the main flue, or over the heating surfaces of one or more of the other boilers of
the group.
I also provide means for heating the water in the boilers which are
being brought into work by the introduction of exhaust steam through a pipe,
nozzle, or circulator placed within the boiler, or by passing the water through a
heater external to the boiler, or by gradual substitution of hot water for cold; the
cold water being drawn off gradually at the blow off cock.
In cases where condensers are used I obtain part or all of the heat necessary
for raising the temperature of the water within the boiler or boilers to 212° Fahr.
by using the exhaust steam from the feed pumps or other supplementary engines.
The additional heat required to raise steam to the working pressure I obtain from.
the waste gases of one of the boilers in full work.
Dated this 8th day of July 1890
W. LLOYD WISE,
Per F. J. Brougham.
COMPLETE SPECIFICATION.
Improvements in the Arrangement and Method of Working Steam
Generators.
I, JOHN SMITH RAWORTH of 112 Belvedere Road, Lambeth, in the County of
Surrey, 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:-
My invention is applicable to groups of two or more boilers working under
circumstances of considerable daily variations of load.
The object of my invention is to reduce the present waste of fuel in getting up
steam in several boilers, some of which may only be required to work for a few
hours daily.
In carrying my invention into effect, I arrange the flues in such a manner that
the products of combustion from one boiler may be made to pass either directly to
the main flue, or over the heating surfaces of one or more of the other boilers
of the group. I also provide means for heating the water in the boilers which are
being brought into work by the introduction of exhaust steam through a pipe,
nozzle, or circulator placed within the boiler, or by passing the water through &
heater external to the boiler. Or I may gradually substitute hot water for the
cold water in the boiler: the said cold water being drawn off gradually at the blow
off cock, as the hot water is run into the boiler.

page_text: Referring to the accompanying drawings,
Fig. 1 is a side elevation of a pair of Babcock water tube boilers fitted with my
improvements and
Fig. 2 is a horizontal section showing the arrangement of flues.
a and bare the ordinary dampers in connection with the main flue. c is a
special damper arranged to close the cross flue d by which flue the products of
combustion from the right hand boiler that is to say, the boiler on the same side as
the damper b may be made to pass under the firegrate of the left hand boiler and
over the heating surface until they escape by the damper a to the main flue. The
heating nozzle or circulator is shown at f. It is supplied with exhaust steam
by the pipe e and the heated water is discharged through the branched pipes k into
the connecting tubes between the steam drum and the sections. Assuming that
the right hand boiler has been some time in use and it is desired to put the left
hand boiler in work, the valve controlling the exhaust steam pipe e should first be
opened which will allow the exhaust steam to enter the circulator, to effect which
there should be a small amount of back pressure on the exhaust or a small jet of
live steam may be admitted to start the circulator.
The damper 6 should now be closed and the dampers a and c opened. The pro-
ducts of combustion from the right hand boiler will then pass through the left hand
boiler and raise its temperature.
When the water begins to boil the exhaust steam supply through the pipe e
should be shut off.
When steam has been raised to full pressure a fire may be lighted on the grate
and at the same time the damper c should be closed and the damper 6 opened.
It is obvious that the same result may be obtained by placing the circulator in a
separate vessel connected by suitable pipes with the boiler.
In cases where condensers are used I obtain part or all of the heat necessary
for raising the temperature of the water within the boiler or boilers to 212° Fahr.
by using the exhaust steam from the feed pumps or other supplementary engines.
The additional heat required to raise steam to the working pressure I obtain from
the waste gases of one of the boilers in full work.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The herein described method of working two or more steam generators by
utilizing the waste gases from the furnace of one boiler with or without the
exhaust steam from an engine or engines, for the purpose of heating the water in
the other boiler or boilers substantially as set forth.
2. In the setting of steam boilers, the use of a supplementary flue or flues whereby
the products of combustion after passing from one boiler may be made to pass
through or around one or more other boilers, substantially as described.
3. The use of an exhaust steam circulator or of a combined exhaust and live
steam circulator placed within or in connection with a steam boiler for the purpose
of heating the water therein to the boiling point substantially as described.
Dated this 7th day of April 1891
JOHN SMITH RAWORTH.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Applicant's Agent.