Improvements in Steam Generators.
Year: 1892

page_text: Date of Application, 27th Dec., 1892-Accepted, 28th Jan., 1893
COMPLETE SPECIFICATION.
[Communicated from abroad by OTIS JONES, of Senoia, Georgia, Capitalist,
HENRY PERCY ASHLEY, of 25, South Forsyth Street, Atlanta, Georgia,
Machinist, SAMUEL MILLIGAN WALL, of 62, Barlow Street, Atlanta,
Georgia, Bank Clerk, JOHN PORTER WOODSON, of 219, Washington
Street, Atlanta, Georgia, Bank Clerk, and EUGENE JESSE DOBBS, of
93, Nelson Street, Atlanta, Georgia, Bank Clerk, all in the United States
of America.]
Improvements in Steam Generators.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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 apparatus in which heat may be applied in raising the
temperature of water in the generation therefrom of steam, the invention con-
sisting of a peculiar arrangement of coils whereby the fullest possible advantage
is obtained from the fuel consumption, the invention comprising elements of cou-
struotion to this end, the details of all of which will be hereinafter fully specified.
In the accompanying drawings-
Figure 1 is a vertical section through a boiler of this construction, showing the
position of the various elements and their form.
Figure 2 is a detail in plan view of the coil crossing from one conical coil to the
other.
Referring to the drawings, a designates a grate set in a frame or base A of any
construction suitable in the premises, or, if gas is to be used as a fuel, a burner of
suitable form may replace the grate. In the present instance the grate is
represented as being supported within a base A. of terra-cotta, brick or analogous
material. Upon this base is set a conical casing B of metal, protected, if desired,
from the heat by a non-conducting lining. To the top of the casing an uptake b is
attached.
C and D designate respectively series of coils of pipe having, in the main,
conical form and are supported by suitable means, one within the other, within the
casing B. The heights of their conical portions are substantially the same, the
inclination of their sides however are of different degrees of slant. They have
the lowest of their coils c and d of which they are respectively formed, connected
by a helical coil e extending parallel to the fire and as near as possible to its upper
surface.
The upper surface of the coils d is continued to form a cylindrical extension f
that projects into the uptake b, the upper end of the small extension being
connected with the inlet pipe f¹.
The coils of this extension are wound as close together as possible so as to
present the greatest possible extent of surface to the action of the heat. Its object
is to allow the utilization of the products of combustion to the greatest possible
extent. Cold water entering from the inlet pipe f' will at first be presented to the
action of the heat at a point where it is comparatively cool and then to a gradually
increasing temperature.
The two series, if both were wound alike, would not produce the result sought,
as the inner series being nearer to the fire would allow the water passing through
it to be heated to a higher degree than it would be in passing through the outer
series, although the diameters of the coils c are greater than those of the coils d
giving the former a greater heating surface. In the present instance the outer
Price I

page_text: series is the superheater and to adapt it to its purpose it should be so constructed
that the water or steam in passing through it will be heated to a higher degree
than it would be in passing through the inner series, or rather, vice versa, the coils
of the inner series are wound farther apart than those of the outer.
In this way
and by reason of the coils c of the outer series having greater diameters than those
of the inner series, thereby giving a greater length of pipe, a much greater heating
surface is given to the outer series, which ensures the proper heating of the steam
after it has passed into the superheater. The outer series while not being so
directly acted upon by the heat, will not be so liable to be burnt out as it would be
if subjected to the flames, as it is not protected by the passage of water through
it. The upper end of the series is connected with the eduction pipe f³.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondents we declare that what we claim is:
In a steam generator, the combination of the two series of coils, substantially
conical in form, one placed within the other, the inner series having a cylindrical
extension above the outer series, and having the coils of its conical portion wound
farther apart than those of the outer series, substantially as described.
Dated this 27th day of December 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.