Improvements in Water-tube Steam Boilers.
Year: 1897

page_text: Date of Application, 10th Dec.,
1897
Complete Specification Left, 10th Sept., 1898- Accepted, 12th Nov., 1898
PROVISIONAL SPECIFICATION.
Improvements in Water-tube Steam Boilers.
I, THOMAS SCOTT, of 20, Hastings Road, Ealing, in the County of Middlesex,
Marine Engineer, do hereby declare the nature of this invention to be as follows:--
This invention relates to what are known as water-tube boilers, and more
especially to that class of such boilers in which the water-tubes are connected!
at their lower ends to water chambers, and at their upper ends to steam drums or
to steam and water drums, these drums being connected with the water chambers
by pipes called down-comers for the purpose of establishing proper circulation of
the water in the boiler.
According to this invention 1 employ a water chamber at the bottom of the
boiler somewhat in the usual way, and preferably a secondary or intermediate
water chamber at each side, with a steam or steanr and water drum or chamber
at the top. The water chamber at the bottom, which is preferably placed at the
centre of the bottom part of the boiler immediately under the steam or steam and
water drum, is connected with the secondary or intermediate water chambers by
micans of a number of water-tubes, and the secondary or intermediate water
chambers with the steam or steam and water drun by means of a number of
other water-tubes. The lower water chamber is also connected directly with the
steam or steam and water drum above it by a series of water-tubes which act as
down-comers, and at the same time form a tubular partition separating the space
enclosed between the side water-tubes into two divisions. Each of these divisions
has at its lower part below the first sot of water-tubes a furnace and combustion
chamber, and above the first set of tubes and below the second set, and on one
side of the central tubular partition, a second combustion chamber. The products
of combustion pass from each furnace through the spaces between the tubes of
the first set into the second combustion chamber, where they come in contact with
the tubes forming the central partition and impart heat to the water contained in
them, but do not pass through the spaces between such tubes because the products
of combustion coming from the other furnace on the other side of the partition
establish a balance of pressure. The products of combustion then pass through
the spaces between the tubes of the second set to the chimney.
The tubes forming the central partition are preferably arranged in two or more
rows and are so shaped and placed with reference to one another that as little
space as possible is left for the passage of the products of combustion from either
furnace to the combustion chamber of the other furuace. This central partition
forms very effective heating surface and acts as a feed water heater.
If preferred the secondary or intermediate water chambers may be dispensed
with, the water-tubes being taken direct from the water chamber at the bottom
to the steam or steam and water drum at the top by any more or less circuitous
route that will form a furnace compartment on one side of each such set of
tubes, and a combustion chamber on the other side, with the central tubular
partition between the two sets of furnaces and combustion chambers.

page_text: By tho above described arrangements the steaming qualities of boilers of this
kind are greatly improved, the uptakes and funnel are prevented from being
burnt, and the funnel from flaming, because the combustion of the gases is coni-
pleted in the combustion chambers before they reach the funnol. Boilers con-
structed in this manner are simple in construction and economical in working both 5
as regards fuel and wear and tear.
I, THOMAS SCOTT, of 20, Hastings Road, Ealing, in the County of Middlesex,
Marine Engiucer, 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:-
This invention relates to what are known as water-tube boilers, and more
especially to that class of such boilers in which the water-tubes are connected
at their lower ends to water chambers, and at their upper ends to steam drums, or
to steam and water drums, these drums being connected with the water chambers:
by pipes called down-comers for the purpose of establishing proper circulation of
the water in the boiler.
And in order that the said invention may be fully understood I will now proceed
to describe the same with the aid of the accompanying drawing, which represents
a partial transverse section and partial front elevation of a boiler constructed in
accordance with my invention.
I employ a water chamber A at the bottom of the boiler somewhat in the usual
way, and preferably a secondary or intermediate water chamber B at each side,
with a steam, or steam and water drum or chamber C at the top. The water
chamber A at the bottom, which is preferably placed at the centre of the bottom:
part of the boiler immediately under the steam, or steam and water drum or
chamber C, is connected with the secondary or intermediate side water chambers 13
by means of a number of water-tubes 1), and the secondary, or intermediate water
chambers B with the steam, or steam and water drum C by means of a number
of water-tubes which may be curved as shewn or straight as may be preferred.
The lower water chamber A is also connected directly with the steam, or steam
and water drum C by a series of water-tubes F which act as down-comers, and at
the same time form a tubular partition separating into two divisions the space
enclosed between the sets of water-tubes D and E on one side of the boiler and
the corresponding sets of tubes on the other side of the boiler. Below the first
set of water-tubes D on either side of the boiler is a furnace G and a combustion
chamber H, and above the first set of water-tubes D and below the second set E
and at each side of the central tubular partition F a second combustion chamber I.
The products of combustion pass from each furnace G and combustion chamber H
through the spaces between the tubes of the first set D), imparting heat to the 4
latter, and into the second combustion chamber I, where they come in contact with
the tubes F forming the central partition and impart heat to the water contained
in them, but do not pass through the spaces between such tubes because the products
of combustion coming from the other furnace on the other side of the partition

page_text: establish a balance of pressure. The products of combustion then pass up through
the spaces between the tubes E of the second set imparting heat thereto, and thence
to the uptake L and chimney J.
The tubes F, forming the central partition are preferably arranged in two or
moro rows, and are so shaped and placed with reference to one another that as
little space as possible is left for the passage of the products of combustion from
either furnace to the combustion chamber I of the other furnace. This central
partition forms very effective healing surface, and acts as a feed-water heater, the
feed being preferably introduced into the chamber C.
If preferred the secondary or intermediate water chambers B may be dispensed
with, the water tubes being taken direct from the water chamber at the bottom to
the steam or steam and water drum at the top by any more or less circuitous
route that will form a furnace compartment G and combustion chamber II on
one side of each such set of tubes, and a combustion chamber I on the other side,
with the central tubular partition F between the two sets of furnaces and com-
bustion chambers.
A suitable form of the tubes, when the secondary or intermediate water
chambers Bare dispoused with, is shown by dotted lines at K in the drawing.
In the drawing L represents the uptake, M the outer side casing, N a second
casing, the space between the two casings being preferably filled with asbestos or
other suitable bad conductor of heat, and P an inner lining of fire-brick or other
fire-resisting material.
The direction of the products of combustion is indicated in the drawing by the
feathered arrows.
By the above described arrangements the steaming qualities of boilers of this
kind are greatly improved, the uptakes and funnel are prevented from being burnt,
and the funnel from flaming, because the combustion of the gases is completed in
the combustion chambers before they reach the funnel. Boilers made in this
manner are simplo in construction and economical in working both as regards fuel
and wear and tear.
Having now particularly described and ascertained the nature of the said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is
First. A water-tube boiler consisting of a water chamber A, secondary or inter-
mediate water chambers B, a steam, or steam and water drum or chamber C, and
water-tubes D, E and F, combined and arranged substantially as described.
Second. A water-tube boiler consisting of a water chamber A, a steam, or steam
and water drum or chamber C, and water-tubes F and K combined and arranged
substantially as described.
Third. In a water-tube boiler the use of a series of down-comer water tubes
connecting the water chamber A directly with the steam, or steam and water drum
or chamber C, and adapted to form a central partition between the two sets of
up-goer water tubes, substantially as described and for the purposes specified.
Fourth. In a water-tube boiler the arrangement of a series of up-goor water-
tube D and E, or K, in such a manner as to divide the combustion chamber HI
into two parts substantially as described.
Dated this lith day of September 1898.
Dated this lilh day of September 1898.
T. SCOTT,
Per W. H. Beck,
Agent, 115, Cannon Street, London, E.C.