Improvements in Sectional Steam Generators.
Year: 1899

page_text: Date of Application, 12th Dec., 1899-Accepted, 13th Jan., 1900
[Communicated from abroad by THE BABCOCK AND WILCOX COMPANY, of New
York, in the United States of America, Steam Boiler Manufacturers.]
Improvements in Sectional Steam Generators.
I, WALLACE- FAIRWEATHER, C.E., of 62, Saint Vincent Street, in the City of
Glasgow, Chartered Patent Agent, do hereby declare the nature of this invention
and in what manner the same is to be performed, as communicated to me, to
be particularly described and ascertained in and by the following statement:—
This invention is particularly designed as an improvement in water tube steam
generators in which the water tubes are inclined at an obtuse angle with the
iront or vertical face of the generator with the object of increasing the capacity
of the combustion chamber of the furnace at its rear part.
In a generator of the type referred to, the products of combustion are permitted
to pass from the furnace directly up and among the inclined water tubes, and
adjacent to the drum, to the escape passage or uptake.
The object of the present invention is to utilize and control the expanding
volume of the gases in the furnace combustion chamber at its rear part by such
disposition of the baffle or partition plates as to direct the course of the expanding
gases to the chamber intermediate of the double series of tubes and among the
water tubes throughout their entire length, from rear to front, all as hereinafter
described.
In the accompanying drawings Figure 1 represents a side elevation of the
generator showing the disposition of the baffles, and Figure 2 is a like view
showing a modification of the invention.
The relative arrangement of the main parts of the generator herein shown are
substantially the same as in the well-known form of the Babcock & Wilcox
Marine Boiler, A, A, representing the headers; 13 the intermediate inclined
water tubes; C the furnace, and D the elevated steam and water drum.
The inclined water tubes are shown of different sizes, the large tubes with
larger intermediate spaces being located directly above the furnace.
In the present arrangement a greater space a is designed between the inclined
clusters of the different sized water tubes, to provide a chamber for greater
expansion of the products of combustion and to locate the accumulation of
ashes and dirt, and facilitate their removal.
The baffle plates are preferably arranged as shown in the drawing, the plate b
at the top of the lower series of water tubes, and at the bottom of the chamber a
and extending from the front header partially over the furnace, forming a
deflecting plate for the products of combustion from beneath and an ash receptacle
from above.
At the end of the plate the baffle h is placed, extending upward at a right
angle therewith across the chamber a and about half the depth of the upper
cluster of inclined water tubes.
About midway of the chamber formed by the plate and the baffle h, another

page_text: baffle is fixed, which depends from the top of the generator and also extends
about half the depth of the cluster of water tubes.
This arrangement of the baffles, as clearly illustrated, causes the products of
combustion from the furnace to follow the course indicated by the arrows to
the escape or uptake, and by means of which the gases are thoroughly circulated
throughout the chamber a and among the inclined water tubes and by the
increased distance they are required to travel, their effective heat is fully
absorbed.
This relative arrangement of the baffles is especially advantageous in associa-
tion with the enlarged rear portion of the combustion chamber of the furnace,
wherein a much greater degree of expansion of the gases takes place than in
furnaces of ordinary construction, and further, in connection with the supple-
mentary expansion chamber a.
This latter part of the invention also provides for the concentration of ashes
and dust upon the inclined covering plate 6 from which they can be easily
removed through a cleaning door communicating therewith at the side of the
generator.
In the modification shown at Figure 2, two rows of horizontal tubes E are
fitted to connect the steam and water drum ]) with the rear headers A, which
latter are embossed around the orifices in them whereinto the ends of the tubes
are expanded.
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-
The combination in a sectional steam generator of a double series of water
tubes both inclined downwardly toward the front of the generator and separated
by an expanding chamber a, a baffle located at the top of the lower series of
water tubes and at the bottom of the chamber a, and extending from the front
partially over the furnace forming a deflecting plate for the products of com-
bustion from beneath and an ash receptacle from above, a baffle h extending
upwards from the inner end of the baffle b across the chamber a and partially
across the water tubes, and a succeeding baffle & depending from the top of the
generator partially across the water tubes, substantially as described.
Dated this 11th day of December 1899