IMPROVEMENTS IN STEAM GENERATORS
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Henry Stracey Barron at the Office
of the Commissioners of Patents on the 9th March 1877.
HENRY STRACEY BARRON, of No. 6, Lime Street Square, in the City of London,
Engineer. "IMPROVEMENTS IN STEAM GENERATORS."
My Invention has reference to steam generators in which liquid (hereinafter
called the heat conducting liquid) having a higher boiling point than the water to
be evaporated is interposed between the said water and the fire or products of com-
bustion, and is made to serve as a medium for transmitting heat from the latter to
the former so as to obviate the action of flame or products of combustion upon the
surface of the metal in contact with which steam is formed.
water.
According to my Invention I employ, in conjunction with a suitable shell or water
containing vessel or chamber, two concentric tubes and a coil or coils; one tube
forms a flue within the other, an annular space being left between them to contain
heat-conducting liquid. The coil (or each of them when more than one are used)
passes through the water in the shell or water containing vessel or chamber, and
forms a connecting passage from one end to the other of the said annular space to
ensure circulation of the heat conducting liquid and transmission of heat to the
Such apparatus may be arranged in various ways. Thus, in one arrange-
ment, I employ three concentric tubes, one of which (by preference tapered) forms
the flue. The second tube surrounds this flue, leaving an annular space between
the two for the circulation of the heat conducting liquid. The water to be evapo-
rated is contained in a second annular space, situate between the outer surface of
the second tube and the inner surface of the third tube. This annular water space
contains a coil or coils surrounding the second tube, and communicating at each end
with the inner annular space containing the heat-conducting liquid; thus it will be
understood that the coil or coils is or are charged with heat-conducting liquid as
well as the inner annular space. Heat being applied to the inner tube or flue the
temperature of the heat-conducting liquid in the adjacent annular space will be raised,
thereby causing it to circulate upward, or from one end towards the other end of
the said annular space, returning by the coil or coils through the annular water
space.
Provision is made for the ready withdrawal of the inner or flue tube, and also

page_text: of the second or intermediate tube with its coil or coils. Thus the various parts of
the apparatus are readily accessible for examination, cleaning and repairing.
A number of generators such as above described may be connected to form one
compound boiler.
In another arrangement I apply several coils in the water space around the inter-
mediate tube in such manner is that the coils shall not individually encircle the
said tube; or the outer tube, shell, or vessel may have within it several flue tubes,
each having a corresponding intermediate or surrounding tube, and a coil or coils so
as to effect the heating and evaporation of the water as described through the
medium of heat-conducting liquid circulating in the annular spaces and coils.
It will be evident that my improved principle of construction, as herein-above
described, may be embodied in forms more or less modified from the foregoing.