Improvements in Auxiliary Steam Generators for Steam Boilers.
Year: 1888

page_text: COMPLETE SPECIFICATION.
Improvements in Auxiliary Steam Generators for Steam Boilers.
I JOHN WILLIAM OLDROYD of No. 8 Quality Court Chancery Lane, London
Manufacturer do hereby declare the nature of the said 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 relates to improvements in fuel economisers for steam boilers the
object of which is to utilize the heat which is otherwise absorbed by the brickwork of
the flues for producing steam or the same can be applied for heating the feed water
for the boilers so as to prevent incrustation or scale.
Instead of making the walls of the flues of brickwork as hitherto customary I
replace the same by long small steam generators of any suitable section, provide these
said steam generators with the customary fittings and connect them with the main
steam pipe direct or the same can be provided with a steam chest like ordinary boilers
but where a super heater is employed this is not considered absolutely necessary.
Instead of leading the steam from the economisers direct into the steam pipe the
same can be connected to the steam chest of the boiler or boilers the main feature of
my invention being the application of the small generators in place of the ordinary
brickwork.
In this manner all the heat resulting from the products of combustion which was
formerly absorbed by the brickwork can be utilized for producing steam.
Fig. 1 represents the application of my invention partly in section and partly in
elevation.
Fig. 2 represents the elevation of a portion of my improved economiser.
Fig. 3 represents a section of a modified form of economiser.
A A are the boilers proper, B the steam chests to the same. C are the connecting
tubes between the steam chests, the economisers and the main pipe leading to the
superheater or to the steam engine. D are the auxiliary boilers or economisers
constructed of suitable boiler plates d and strengthened by angle iron d¹. E represents
the connecting-tubes between the boilers A and the economisers D. F is the brick-
work G the furnace doors, H the ash-pit doors.
The play of the flames around the boilers A and between the same and the
economisers D is too well known to need explanation and it will also be evident to all

page_text: technically educated persons that an enormous increase in the production of steam and
consequently a like saving in fuel will be attained.
I wish it to be understood that I do not restrict myself to any special form of
auxiliary boiler or economiser as the shape can be varied in many ways without
departing from the nature of my invention.
Having now particularly described my said invention and in what manner the
same is to be carried into effect what I claim is :-
1. The combination of the boilers A, steam chests B, steam tubes C, water pipes E,
with the auxiliary boilers or economisers D substantially as and for the purpose set
forth in the foregoing specification and shown in the accompanying drawing,
2. The use of auxiliary boilers or economisers D, substantially as and for the
purpose set forth in the foregoing specification and shown in the accompanying
drawing.
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GEO. DOWNING,
Agent for Applicant.