Improvements in and relating to Steam Superheaters.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Steam Superheaters.
I, HUGH MCPHAIL, of Manygates House, Wakefield, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to steam superheaters.
According to one arrangement I construct the superheater of a series or nest
of U shaped or similarly shaped tubes connected at their upper or free ends
to a box which is horizontally or otherwise arranged and divided by a trans-
verse partition into two compartments which communicate by means of the
aforesaid series of U shaped tubes. One or more of such superheaters are
located within the side flues of the steam generator and are connected to the
latter by suitable pipes. The position of the boxes forming part of the super-
heaters is such that their lids or covers can be readily reached from the top
portion of the side flues, when the superheaters are to be repaired or inspected.
In order to regulate the temperature of the superheated steam it may be led
through a pipe or pipes passing through the steam generator prior to its pas-
sage to the engine. Suitably arranged valves on the aforesaid pipes may be
provided for enabling the steam to be taken direct from the generator instead
of from the superheater. I may also provide an appropriate safety valve for
the superheated steam. I also furnish the superheaters with suitable draining
devices for condensed steam to be withdrawn therefrom.
When several of the superheaters are employed I may so connect them to each
other and to the generator that the steam in its passage through them passes
first to a superheater on one side of the steam generator and then to one on the
opposite side. In other cases I may arrange for the steam to flow through all
the superheaters on one side before flowing through those on the other side.
In other cases the steam may be divided into two streams one of which is
caused to flow through the superheaters on one side of the generator and the
other through the superheaters on the other side, the said streams meeting in
a main pipe or passage common to the two series of superheaters.
According to another arrangement instead of employing U-shaped tubes in
the superheaters I employ tubes that are bent approximately to the same curva-
ture as that of the steam generator, with their ends connected to boxes which
are situated in the side flues of the generator, one box being at the upper part
and the other at the lower part thereof, in such positions that their lids or covers
can be readily reached for purposes of repair. As in the previously described
arrangement, the upper box is accessible from the upper part of the side flue;
the lower box is accessible from the bottom flue of the steam generator. When
it is desired that the steam to be superheated shall flow from the superheaters
on one side of the generator to the superheaters on the other side, the lower
boxes of the superheaters are connected by bent pipes or "breech pipes" extending
transversely beneath the generator. These pipes are bent approximately to

page_text: the curvature of the generator and may be furnished with drain pipes for
drawing off the condensed steam therefrom. In this arrangement, as in the
one already described, suitably arranged stop valves may be provided for enabling
the steam to be taken direct from the generator to the engine if desired; a
safety valve may also be provided.
According to another construction of the superheaters I may arrange hori-
zontally in the side flue of the generator one or more boxes which are connected
by series of suitably bent tubes to one or more vertically arranged boxes
situated at the end of the generator.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in and relating to Steam Superheaters.
I, HUGH MCPHAIL, of Manygates House, Wakefield, in the County of York,
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:-
This invention relates to steam superheaters and consists in arranging the
superheaters in the side flues of the steam generator in such a position that the
highly heated products of combustion passing through the said flues effectually.
heat the superheaters. The superheater or superheaters in one side flue prefer-
ably but not necessarily communicate with those in the other side flue, and the
superheated steam may, after passing through the superheaters, be led through
the steam generator before being conducted to fits point of utilization, in order
to regulate its temperature.
In order that my invention may be clearly understood and readily carried into
effect I will proceed to describe the same more fully in connection with the
accompanying drawing in which:-
Figure 1 is a side elevation partly in section.
Figure 2 is a back end elevation partly in section, and
Figure 3 is a plan of a steam generator fitted with a superheater according
to my invention.
Figure 4 is a similar side elevation to Figure 1 but shows the superheater
boxes in the same flue arranged at right angles to one another.
Figures 5, 6, and 7 are respectively a side elevation, a back end elevation,
and a plan, all partly in section showing a modified form of my superheater, and
Figures 8, 9, and 10 are respectively a side elevation, a back end elevation,
and a plan all partly in section showing a further modification of my invention.
Referring more particularly to Figures 1 to 3, A is the steam generator,
B B are the side flues. C, C are the furnace flues, a are the generator tubes
and B2 is a chamber at the back end of the generator into which the flues C
lead. 1) and D¹ are superheater boxes situated respectively in the side flues B, B¹
in such a position that their lids or covers are easy of access from the tops of
the flues. Each of these boxes is provided with a transverse partition d, dividing
it into two halves which are respectively connected by the nests of tubes d', d²
situated respectively in the side flues B, B'. E is a pipe connecting one end

page_text: of the box D¹ to the steam space of the generator. F is a pipe passing round
the front end of the generator and connecting the opposite end of the box D
with one end of the box D, the opposite end of the box D communicating by
means of a pipe G with the point where the steam passes to be utilized.
Referring to Figure 4 the general arrangement of the superheater is the same
as in the previous figures, but instead of having one box with a division in each
side, there are two boxes placed at right angles to each other in each side flue.
In the above figures the steam passes from the steam space in the generator
through the pipe E to one side of the box D' and thence through the tubes d
to the opposite side of the box D), from this point it is conveyed through the
pipe F to one end of the box D from whence it passes through the tubes i
to the opposite side of the box D and is finally led through the pipe G to the
point of utilization. As the steam passes through the tubes dit becomes
superheated by the products of combustion which pass from the flues C through
the generator tubes a and thence through the side flues B and B where they
heat the tubes d¹, d².
Referring to Figures 5, 6, and 7 the steam generator, flues, superheater boxes
and tubes, and the pipes E, F, and G are arranged as previously described, but
the superheated steam instead of passing from the box 1) direct to the point
of utilization, is led through the pipe G to the pipe g which passes through the
steam generator, and thence from the generator to the point of utilization by
means of the pipe H; the temperature of the superheated steam being thus
regulated.
Referring to Figures 8, 9 and 10 these show a modified form of my apparatus
in which the steam generator and flues are arranged as aforesaid. The boxes D
and D¹ are arranged respectively at the tops of the flues B, B', but have no
transverse partitions. D and Di* are boxes situated respectively at the bottoms
of the flues B and B and having their lids or covers accessible from the bottom
flue of the steam generator. The boxes 1) and D are connected by the tubes d',
and the boxes D1 and D are connected by the tubes 2; the tubes and being
approximately of the same curvature as the steam generator. The boxes 1)*
and D are connected by a pipe which is also bent approximately to the curva-
ture of the generator and is provided at its lowest joint with drain pipes d' for
drawing off condensed steam. The steam passes from the steam space in the
generator through the pipe E to the box and thence through the nest of
tubes to the box D₁ from which it passes through the tube to the box D
and then through the nest of tubes d to the box D from which it is conducted
by the pipe G to the point of utilization; the steam becoming superheated in
its passage through the tubes as previously described.
In all the foregoing modifications J, J, and J2 are stop valves, and J3 is a safety
valve for the superheater. When the valve J is closed and the valves J¹, Ja are
open the steam passes through the superheater before reaching the engine but
when the valve J is open and the valves J1 J2 are closed the steam is led directly
from the steam space in the generator to the point of utilization.
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. A steam superheater consisting in a nest or nests of tubes situated in each
of the side flues of the steam generator for the purpose specified.
2. A steam superheater of the kind referred to, in which the nest or nests of
tubes in one side flue communicate with those in the other side flue, and the
steam is caused to pass through the said tubes in its passage from the generator
to the point of utilization, for the purpose specified.
3. In combination with a steam superheater of the kind referred to, means for
5 passing the superheated steam through the steam generator on its passage from
the uperheater to the point of utilization, for the purpose specified.

page_text: 4. A steam superheater constructed, arranged, and operating substantially as..
herein described with reference to Figures 1 to 3, or to Figure 4, or to Figures 5-
to 7, or to Figures 8 to 10 of the accompanying drawings, for the purpose specified.
Dated this 19th day of November 1898.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.