Improvements in Steam Generators and Apparatus connected therewith.
Year: 1897

page_text: Date of Application, 2nd Mar., 1897
Complete Specification Left, 2nd Dec., 1897-Accepted, 15th Jan., 1898
PROVISIONAL SPECIFICATION.
Improvements in Steam Generators and Apparatus connected
therewith.
We, WILLIAM WORBY BEAUMONT, of Outer Temple, 222, Strand, London, Con-
sulting Engineer, and HENRY PERCY HOLT, of 22, Chancery Lane, London, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
Our invention relates to the construction and use of steam generators of the
tubular class, and to the steam and water connections therewith, and the
apparatus employed for the inlet and outlet of water and steam, and the control
thereof; it also relates to the furnace and other fuel burning apparatus employed
for the heating of the said generators. According to our invention the steam
generator preferably consists in the combination of a series of duplex spirally
coiled tubes, each pair of tubes being connected to one segment of a series of joint
forming pieces, containing water and steam tubes or passages, separated from
each other, but connected by means of one of each pair of tubes constituting the
duplex combination. One tube of each duplex spiral has a stopped ond, and an
internal tube is open at both ends; in some cases, the second of each pair of
tubes forms the water tube, and the outer tube the steam tube, but both will or
may act as water-heating and evaporating tubes; generally the inner tube of each
spiral admits water into the stopped end of the outer tube, the water being heated
in its traverse in the inner tube, and evaporated on its return to the steam
passage before mentioned through the annular space between the two tubes, this
space being generally of small dimension or thickness. In some cases the spiral
does not occupy or extend into the central part, but space is there left for a
central tube which, in some forms of the boiler and methods of heating, forms
the inlet for the fuel, and in others for the air to support combustion.
The ends of the water introducing tubes, whether internal or external to the
second of each pair, may have the inlet orifice restricted by suitable means, and
the end of each tube forming a pair may be brazed into the joint and steam
and water forming connection piece forming part of the series, or they may be
otherwise fixed into these. The water may be admitted into the top or the
bottom one of the series of chamber or water and steam-passage connections, or
it may be admitted into one or more of the intermediate connecting pieces. The
joint pieces forming the connections for a generator, consisting of a large or of a
small number of spirals, may be connected together, and the joints between the
whole of their faces made by two bolts which pass through the small steam
spaces within them, and through the two flange or cover pieces at the ends of
the series; these bolts may be solid or may be tubular, and if of the latter form,
may be employed as connections for steam fittings.
When a large central tube is not employed for the admission of air or of fuel,
the spiral may occupy the central space, and the stopped ends of the external
steam generating tubes, may be assembled into a suitable connecting piece or
pieces, or the stopped ends may be so formed as to be connected and supported

page_text: be
at their proper distances apart. The feed water to the boiler may be fed directly
thereto by a suitable form of feed pump fitted with safety or escape valves, as
well as the usual valves, or the water from the pump may pass into an air chamber
of suitable dimensions, on' its way to the generator, and the water may
admitted into the generator through a valve or by a valve which automatically
comes in action when steam pressure falls below a determinable minimum,
the same valve being in some cases arranged to lift the pump suction valve. Pro-
vision is made also for the admission, when necessary, of water from a conveniently
situated hand pump, and for preventing the admission of water by the automatic
arrangement at any time. The admission of steam from the boiler to the engine
or other apparatus to which it is supplied, may be regulated by an ordinary stop
valve, or by a valve controlled automatically by apparatus influenced by the steam
requirements. In some cases the heating of the generator may be effected by
a liquid fuel burner or burners, or may be by means of a gas generator or pro-
ducer form of furnace, in which case air in proper proportions will be intro-
duced, either under the producer grate or above the producer fuel, and whether
this form of furnace be used, or an ordinary furnace or fire, the air required,
or part of it, may be supplied heated from the casing of an air condeuser, used in
connection with the engine supplied by the steam generator and to which the
air is supplied by a blower or fan of suitable kind." A portion of the exhaust
steam from the engine supplied by the generator may be admitted with the air
below the producer grate. When the air supply is from an air condenser con-
taining a fan worked by the exhaust steam, the supply of air with or without
more or less water vapour, will be automatically greater or less, according to the
work being done by the engine.
Dated this lot dow of M
1007
Improvements in Steam Generators and Apparatus connected
therewith.
We, WILLIAM WORBY BEAUMONT, of Outer Temple, 222, Strand, London,
Civil Engineer, and HENRY PERCY HOLT, of 22, Chancery Lane, London, Civil
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: -
Our invention relates to steam generators of the tubular class and to the steam
and water connections therewith, and we now describe it with reference to the
accompanying drawings in which Fig. 1 is a vertical section of a generator accord-
ing to our invention along the line - of Fig. 2, which is a plan of the same
with the top cover removed, Fig. 3 is a sectional plan of one of the tube connect-
ing pieces shewing the steam and water passages and the connecting bolts; and
Fig. 4 is an enlarged vertical section of the same. According to our invention
the steam generator preferably consists in the combination of a series of duplex
spirally coiled tubes A and beach pair of tubes being connected to one segment
of a series of joint forming pieces C containing water and steam tubes or passages D
and E respectively, separated from each other, but connected by means of one
of each pair of tubes A and b constituting the duplex combination. The tube A
of each duplex spiral has a stopped end z, and the internal tube is open at
both ends; in some cases the second of each pair of tubes namely the tube b
forms the water tube, and the outer tube A the steam tube, but both will or

page_text: may act as water heating and evaporating tubes, generally the inner tube of each
spiral admits water into the stopped end of the outer tube, the water being
heated in its traverse in the inner tube, and evaporated on its return through
the annular space between the two tubes into the steam passage E before men-
tioned this space being generally of small dimension or thickness.
In some
cases the spiral does not occupy or extend into the central part, but space is
there left for a central tube F, which in some forms of the boiler and methods
of heating, forms the inlet for the fuel, and may in others admit air to support
combustion. The ends of the water introducing tubes, whether internal or ex-
ternal to the second of each pair may have the inlet orifice restricted by suitable
means, as for instance by ferrules f. Fig. 1 the holes in which may be of different
sizes, and which may in some cases be fitted with a small tube g Fig. 4, to carry
the water a short distance into the tube b before delivery into it, this may in
some cases be preferable for the upper coil or coils. The end of each tube form-
ing a pair may be brazed into the joint and steam and water forming connection
piece C forming part of the series, or they may be otherwise fixed into these by
known means.
The water may be admitted into the top or the bottom one of
the series of chamber or water and steam passage connections, or it may be
admitted into one or more of the intermediate connecting pieces. The joint
pieces forming the connections for a generator consisting of a large or of a
small number of spirals, may be connected together and the joints between the
whole of their faces made by two bolts H. H, which pass through the small
steam spaces within them, and through the two flange or cover pieces J at the
ends of the series; these bolts may be solid or may be tubular, and if of the
latter form, may have a hole or holes made in them to admit steam, so that they
may be employed at their ends for holding steam fittings such as pressure guages
or whistles. When a large central tube F is not employed for the admission of
air or of fuel, as for instance when a liquid fuel burner replaces the grata K shewn,
the spiral coils A may be continued so as to occupy the central space, and the
stopped ends of the external steam generating tubes may be assembled into a
suitable connection or supporting piece or pieces preferably forming a column,
or the stopped ends z. may be so formed as to support or keep the coils at their
proper distances apart. When the central ends are so connected together that
a common passage from them all is formed, this passage may be used for the
steam pipe and off take and the internal pipe b may be dispensed with, the feed
water supply to the lower tubes being greater or easier than to the upper tubes.
The feed water to the boiler may be fed directly into the pipe L or into the
sections C by one or more inlets. All the sectional connecting pieces C are jointed
by true flat surfaces, but a groove or grooves as indicated in Figs. 1 and 4, and
on one or both sides, may be made for the reception and holding of a jointing
wire or other material.
The products of combustion may pass away through the apertures P. P. in the
upper part of the refractory lining of the case containing the generator and thence
into the external casing shown and away by a chimney 7, or from a chimney
at 7', or elsewhere conveniently situated, or when the spaces between the internal
and external case is left open at the bottom as shewn, they may pass away there-
from.
When the bottom of the casing at Q is partly closed, the air for supporting
combustion where solid fuel is burned on the grate K, may in part pass down
the tube or fuel funnel F and the remainder through inlets in the bottom under
the grate and toward the periphery thereof, and the tube F may be provided
with a suitable cover for closing or partly closing it. A door for access to the
fire or grate may be made in the casing and lining as indicated by dotted lines
at R.
In a modification of the arrangement of the groups of duplex coils to form a
horizontal generator, the coils are preferably placed at an angle with the combus-
tion chamber centre line as shewn by the diagram Fig. 5, in which it is assumed

page_text: that the coils A are heated by a liquid fuel burner B supplied with air at a. and
oil at b. the products passing away at lor at p. When solid fuel is used the
furnace may
be as shewn at F by dotted lines, and the coils may be inclined in
the direction shewn by dotted lines E, the connections C and connecting parts
being as before described.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is: -
1. A steam generator having two or more duplex coils of tubes, connected
together in the relation and by the tube and steam and water chamber connecting
pieces grouped and held together with the coils, within a furnace or combus-
tion chamber substantially as these duplex coils and connecting parts are herein
described and shewn.
2. In a steam generator the duplex coils formed with one tube within an outer
tube, said outer tube having a closed end to which the contents (water or steam)
of the inner tube are delivered and from which said contents escape by returning
through whole length of annular space between said tubes to connecting chamber
pieces holding open ends of said tubes substantially as herein described and
shewn.
3. In a steam generator the duplex coils formed with one tube within an outer
tube, said outer tube having a closed end to which the contents of the annular
space between the two tubes are delivered and from which said contents escape
by returning through the whole length of the inner tube to connecting chamber
pieces holding open ends of the said tubes substantially as herein described and
shewn.
4. The steam and water chamber duplex tube connecting pieces C substantially
as herein described and shewn.
5. In a steam generator the arrangement of duplex tubes and connecting
chamber pieces with restricted admission of water into inner tube some distance
from the end thereof substantially as herein described with reference to Fig. 4.
Dated this 2nd day of December 1997
W. WORBY BEAUMONT.
HENRY P. HOLT.