Year: 1886

page_text: I, CHARLES ALBERT KNIGHT, of the Babcock and Wilcox Company, 107 Hope
Street, in the City of Glasgow, 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:-
My invention relates to sectional steam generators wherein are embodied the
clements of the well known Babcock and Wilcox type of water tube boiler and
the improvements consist (1) in a rearrangement of the several parts in such a
imanner as, while providing for the maintenance of the usual high efficiency as
regards safety economical working and evaporative power of the boiler, to ensure
the more effectual separation of, the water carried in suspension by the steam in
the act of vaporisation in order that dry steam may be obtained, (2) in the
formation of the steam or steam and water drum or drums in separable parts
which individually are of comparatively light weight and therefore easy of trans-
port and which owing to the construction adopted may, when assembled for
erection, be secured or bound together without the aid of highly skilled labour,
and (3) in making provision in connecting and carrying the steam and water
drums relatively with each other and with the other parts of the structure for
varying expansion or elongation and contraction of the drums under variations of
temperature.
As will be seen by reference to the accompanying drawings, which illustrate two
modifications of steam generators constructed in accordance with my invention,
the front and rear headers instead of being connected directly to a steam and
water drum extending longitudinally over the furnace or flame chamber, as in the
usual type of Babcock and Wilcox boiler, are connected to a cross drum at
the rear end of the flame chamber and to said drum, which receives the water
circulating through the boiler tubes and the steam which is disengaged therefrom,
is connected an auxilliary drum to which the steam passes and becomes freed from
water,
In the drawings figure 1 is a front elevation, figure 2 a longitudinal section and
figure 3 a cross section of one modification of the improved steam generator and
figure 4 is a detailed section showing the formation of the joint where the separable

page_text: parts of the drum are united. Figure 5 is a cross section and figure 6 a longitudinal
section of another modification of the boiler, the only material difference in con-
struction being in respect of the location of the auxilliary steam drum which in
the one modification is carried longitudinally over the crown of the furnace or
flame chamber and in the other modification is supported upon the main water
drum which extends crosswise of the flame chamber.
. As regards the construction and arrangement of the furnace A and flame
chamber Band of the water tubes C and end headers or manifolds D, D¹ the
general features of the Babcock and Wilcox boiler under its various forms may be
followed. The connection from the front header D to the steam and water drum E
is however formed by a series of horizontal or inclined water tubes F extending
longitudinally under the crown of the furnace or flame chamber, the ends of such
tubes being expanded into the header and cross drum respectively. The rear
header D¹ is in like manner directly connected to the cross drum by vertical or
inclined tubes G. In the one modification as represented in figures 1, 2 and 3 the
steam drum H is connected at one end by a tubular branch I which in the present
instance is kneed and is rivetted, bolted or otherwise secured over orifices formed in
the top of the cross steam and water drum E and rear end of the auxilliary steam
drum H, the drum H at its front end being supported by a stool J resting on the
crown of the flame chamber and so fitted as to permit of the free elongation and
contraction of the drum. In the modification represented by figures 5 and 6 the
auxilliary steam drum H is connected to the steam and water drum E by a vertical
branch I of increased diameter forming a support for one end of the steam drum
while the opposite end of said steam drum is supported by a stool J resting on the
lower drum E. In each case the steam is led off through a stop valve chest or
dome K, or by other suitable pipe connections from a point. as far removed as is
practicable from the connection between the drums in order that any water carried
in suspension may be allowed to deposit before the steam reaches the outlet K.
A small pipe L is provided for draining the deposited water from the drum H into
the drum E in cases where the connection I is higher than the bottom of the
auxilliary steam drum as shown in figures 1, 2 and 3. In the same manner
I propose to connect an auxilliary steam drum to the longitudinal steam and
water drum of the ordinary type of Babcock and Wilcox boiler.
:
In order to divide and reduce the weight and bulk of the steam drum or steam
and water drum, the drum when of considerable length is made up of separable
parts consisting of sections which are connected together by securing upon their
open ends annular straps or rings M, one being rivetted or otherwise secured
within the drum section at each joint and the other outside the adjoining drum
section so that the one ring enters the other. The meeting surfaces of the rings M
are turned by preference with a slight taper, as shown in figure 4, to form a close
fitting joint when the sections of the drum are united.. The parts of the drum,
when assembled, are secured together by means of turned and fitted taper bolts m
or similar fastenings for the fitting of which highly skilled labour is not required.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that
what I claim is:-
1. The arrangement in combination of the several parts of a sectional steam
generator in the improved manner herein described with reference to the annexed
drawings.
2. A sectional steam generator consisting of the following elements in combination,
viz; the water tubes C, end headers or manifolds D, D¹, a steam and water drum
or reservoir E located at the rear of the flame chamber and fitted transversely
thereof, tubes F and G connecting the front and rear headers respectively to said
drum, and an auxilliary steam drum or reservoir H connected to the drum E,
substantially as herein described with reference to the annexed drawings.

page_text: 3. In a sectional steam generator of the class herein before referred to, the
combination of a steam and water drum and an auxilliary steam drum or reservoir
connected thereto at one end, the auxilliary drum being supported near its opposite
end in such a manner as to provide for elongation and contraction due to variations.
of temperature, substantially as herein described with reference to the annexed
drawings.
4. A drum or reservoir, for a sectional steam generator, composed of a number
of separable parts or sections united and secured together in the improved manner
herein described with reference to the annexed drawings.
CRUIKSHANK & FAIRWEATHER,
Agents.