IMPROVE- MENTS IN STEAM GENERATORS
Year: 1876

page_text: LETTERS PATENT to Henry Stracey Barron, of 92, Tyrwhitt Road, Lewisham
High Road, in the County of Kent, Engineer, for the Invention of " IMPROVE-
MENTS IN STEAM GENERATORS."
PROVISIONAL SPECIFICATION left by the said Henry Stracey Barron at the
Office of the Commissioners of Patents on the 2nd November 1876.
HENRY STRACEY BARRON, of 92, Tyrwhitt Road, Lewisham High Road, in the
County of Kent, Engineer. "IMPROVEMENTS IN STEAM GENERATORS."
My Invention has reference to steam generators, in which liquid (herein-after
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
combustion, 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.
My improved generator is suitable for marine purposes, and is designed to realize
a high degree of safety in the generation of steam of high pressure with compara-
tively thin plates, and to afford special facilities in the way of accessibility for
examination, cleaning, and repair.
In one arrangement the shell or main body of my generator in external appearance
somewhat resembles an ordinary marine boiler of low-pressure type, and of the kind
having its return tubes over and above the furnaces. This shell, which is at its upper
part open to the external atmosphere, constitutes a reservoir for the heat-conducting
liquid, which may be for example linseed oil. Through this heat-conducting liquid
pass the fire-boxes and fire tubes or flues, also water tubes arranged in sets. These sets
of tubes are placed one set above another, and there may be two or more series of sets.
The water intended to pass through and be evaporated in each series of tubes enters
a small chamber at the lower part of the front end of the generator, and passes
thence to the back of the generator, where there is another small chamber, which
establishes communication with a set of return tubes of slightly larger diameter or
more in number arranged above the first row. After returning to the front of the
generator the water and steam pass through a third set of tubes to the back, then
by a connecting tube from a small back chamber to that of the next higher set of
..

page_text: tubes, passing through these to a small chamber at the front, and returning through
the next higher set to the back of the boiler, then by a connecting pipe to the next
higher set of tubes, through them to the front, then back by a higher set, and finally
the steam collects in a cylindrical chest provided to receive and store it in the upper
part of the shell,
The number of sets of tubes may be varied to suit circumstances.
The small end chambers are provided with well secured covers, by removing
which the various tubes may be readily got at. The tubes of each set present a
larger total sectional area than the set next below.
Another arrangement is as follows:-The shell or main body resembles that of
an ordinary low marine boiler, having the return tubes by the side of the furnace or
furnaces. This shell or main body forms the reservoir for heat-conducting liquid;
this liquid surrounds the fire-boxes and return flues.
Above a part of the main body or shell are arranged several inclined cylindrical
vessels in communication with the main body or shell. Each of these cylindrical
vessels has within it a small chamber at each end, and these two chambers are con-
nected by a number of small tubes. The part of each vessel surrounding these tubes
is in communication at its lower end with the main body or shell; at its upper end
each of the cylindrical vessels communicates with a main, whereby the heat-con-
ducting liquid is returned to the lower part of the main body or shell. The small
chambers at the lower ends of the cylindrical vessels receive water and steam from
tortuous pipes, which pass to and fro within the main body or shell above the fire-
boxes, and are surrounded by heat-conducting liquid.
The water and steam pass upward through the tubes to the chambers at the
upper ends of the cylindrical vessels; the steam passes thence by a main to the
steam chest.
The details of both arrangements may obviously be more or less modified to suit
circumstances without departing from the distinctive character of my Invention.
Generators for use on land may be constructed according to my Invention.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Stracey Barron in the Great Seal Patent Office on the 2nd
May 1877.
HENRY STRACEY BARRON, of 92, Tyrwhitt Road, Lewisham High Road, in the
County of Kent, Engineer. "IMPROVEMENTS IN STEAM GENERATORS."
My Invention has reference to steam generators of the class 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 combustion, 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.
My improved generator is suitable for marine purposes, and is designed to realize
a high degree of safety in the generation of steam of high pressure with compara-
tively thin plates, and to afford special facilities in the way of accessibility for
examination, cleaning, and repair.
The shell or main body of my generator in external appearance somewhat
resembles an ordinary marine boiler of low-pressure type, and of the kind having
its return tubes over and above the furnaces. This shell, which is at its upper part
open (by a hole or holes) to the external atmosphere, constitutes a reservoir for the
heat-conducting liquid. Through this heat-conducting liquid pass the fire-boxes
and fire tubes or flues, also tubes I call water tubes arranged in sets; these sets of
water tubes are placed one set above another, and are connected by end chambers
and by connecting tubes, as herein-after described. The water to be evaporated is

page_text: caused to pass through the said water tubes and end chambers and connecting
tubes.
The number of sets of tubes may be varied to suit circumstances.
The end chambers are provided with well secured covers, by removing which the
various water tubes may be readily got at. The tubes of each set present a larger
total sectional area than the set next below.
Generators for use on land may be constructed according to my Invention.
Such being the nature of my said Invention I now proceed to describe the manner
of carrying the same into practical effect, as illustrated by the accompanying
Drawings, wherein,―
Fig. 1, Sheet 1, shews one of my improved steam generators in section in two
different but parallel planes, that to the left of the centre of the Figure being in the
line A, B, of Fig. 2, and that to the right in the line C, D, of the same Figure;
Fig. 2 is a longitudinal vertical section in the line E, F, of Fig. 1.
Fig. 3 is a sectional plan, that portion to the left of the centre of the view being
taken in the line G, H, of Fig. 1, and the portion to the right in the line I, K, of
Fig. 1.
Fig. 4 shews in end elevation one-half of the generator. a is the shell or main
body of the generator resembling in external appearance an ordinary marine boiler of
low pressure type, b is a perforation by which the upper part of the shell is open
to the external atmosphere. The shell is to be charged, say up to the line x, Fig. 1,
with heat conducting liquid which may be, for example, olive oil. Through this
heat conducting liquid pass the fire-boxes c, c, and fire tubes or flues d, d; also
water tubes ff¹, ƒ³, ƒ³, ƒ^ƒ³, fo, arranged in sets. The water intended to pass
through and to evaporate in each series of tubes f,ƒ³, ƒ², ƒ³, ƒ^‚ ƒ³, ƒ³, enters the
small chamber e at the lower part of the front end of the generator, and passes
thence by the tubes f to the back of the generator, where there is another small
chamber el which establishes communication with a set of return tubes f¹ more in
number than the tubes f, there being five such return tubes f¹; or instead of using
the greater number the return tubes f¹ may be of slightly larger diameter; after
returning to the front of the generator the water and steam pass by the chamber e
to a third set of tubes f2 and through these to the back chamber e³, thence by a
connecting tube g from the said chamber e³ to the chamber e of the next higher set
of tubes f passing through these to the small chamber e at the front, and returning
through the next higher set of tubes f' to the chamber e at the back of the
boiler, thence by connecting pipes g¹ and the chamber e' to the next higher set of
tubes f³, and through them to the front chamber es, then back by a higher set of
tubes to the back chamber eº, and finally the steam passing off by pipes g² collects
in a cylindrical chest h in the upper part of the shell.
It will be observed that the only water containing portions of the apparatus
directly exposed to the action of the products of combustion are the front end
chambers es, es, and that the products of combustion will have been deprived of a
very considerable proportion of caloric before coming in contact with the surfaces of
the said chambers.
Fig. 5 (Sheet 2) shews another arrangement of my improved steam generator in
section in two different but parallel planes, that to the left of the centre of the
Figure being in the line L, M, of Fig. 6, and that to the right in the line N, O, of
the same Figure.
Fig. 6 is a longitudinal central vertical section of the generator.
Fig. 7 is a back elevation thereof; and Fig. 8 is a sectional plan, the upper half
of the view being taken in the line P, Q, of Fig. 5, and the lower half in the
line R, S, of the same Figure. a is the shell or main body of the generator supposed
to be charged with heat conducting liquid open to the external atmosphere through
the hole b; c, c, are the fire-boxes; d, d, the fire tubes or flues and fif¹³‚ ƒ³‚ ƒ³; ƒ^,
ffff, the water tubes arranged in sets.
The water intended to pass through and be evaporated in the series of tubes f, f¹,
ƒ³‚ ƒ³‚ ƒ^ ƒ³‚ ƒ³, ƒ³, fs, enters the small chamber e at the lower part of the front

page_text: end of the generator, and passes thence by the tubes f to the chamber e¹ at the back
of the generator which establishes communication with the side rețurn tubes f¹
more in number than the tubes f, there being four return tubes f¹; or instead of
using a greater number the return tubes f' may be of slightly larger diameter, as
explained with reference to the preceeding arrangement, after returning to the front
of the generator the water and steam pass by the chamber e2 to a third set of
tubes and through them to the back chamber e, thence through the tubes f³ to
the front chamber e returning by the tubes f₁ to the back chamber e", and passing
thence by the connecting pipes g from the said chamber e to the chamber ef of the
next higher set of tubes f5 passing through these to the chamber e' at the front, and
returning through the next higher set of tubes f to the chamber e8 at the back of
the boiler, thence to the next higher set of tubes f', and through them to the front
chamber e, then back by a higher set of tubes f8 to the chamber e¹0, and thence by
pipes g the steam passes to the cylindrical chest h wherein it is stored in the upper
part of the shell. i, i, are pipes to facilitate the circulation of the heat conducting
liquid.
Having described the nature of my said Invention and explained the manner of
carrying the same into practical effect, I desire to have it understood that I do not
claim as of my Invention the use in a steam generator of a liquid (herein called the
heat conducting liquid) having a higher boiling point than the water to be
evaporated, such heat conducting liquid being interposed between the said water
and the fire or products of combustion, and made to serve as a medium for trans-
mitting heat from the latter to the former; I am fully aware that various
arrangements of steam generators designed to operate on this principle have been
from time to time proposed; furthermore, I do not intend to claim any parts of
the apparatus herein-before shewn and described when taken separately and apart
from the combination or application thereof, substantially in manner and for the
purpose herein described, but what I consider to be novel and original, and therefore
claim as the Invention secured to me by the herein-before in part recited Letters
Patent is, the improved apparatus constructed, arranged, and operating as shewn in
and described with reference to the accompanying Drawings for the purpose
specified.
In witness whereof, I, the said Henry Stracy Barron, have hereunto set my
hand and seal, this Second day of May, in the year of our Lord One thousand
sight hundred and seventy-seven
H. S. BARON. (L.S.)