Improvements in Steam Superheaters.
Year: 1898

page_text: Improvements in Steam Superheaters.
I, JAMES HERMANN ROSENTHAL, of 147, Queen Victoria Street, in the City of
London, Engineer, do hereby declare the nature of this invention to be as
follows:-
The invention relates to apparatus for superheating steam, either by means of
waste heat from steam generators or other furnaces, or by means of a separate furnace
for this purpose; and it also comprises means for indicating the degree of superheat,
or temperature of the superheated steam.
The superheater consists of boxes or pipes connected together in pairs by means
of a series of tubes, preferably bent to "U" shape, one limb of each tube being
connected to one box and the other to the adjoining box, these bent tubes being
exposed to the hot gases and serving as the main heating surface of the super-
heater. Steam from the boiler enters the first box, and is conveyed through the
"U" shaped tubes into the second box, and from thence it passes into the steam
main. series of boxes or tubes as described may be used, so that the steam may
circulate more freely through the superheater.
According to one arrangement the superheater is placed between the boiler, or
other furnace, and the main flne, in a separate chamber, the dampers being so
arranged that the heated gases may be turned either through the superheater
chamber or through a bye flue, or partly through both.
According to another arrangement the superheater is made to work in conjunction
with a number of boilers, and placed in the main flue. An arrangement of
dampers and bye flue, as before described, being provided.
In a further arrangement, instead of utilizing the waste heat from the boiler as
before described, a separate furnace is employed. The furnace is arched over with
refractory material, and is provided with a second chamber, in which the superheater
is placed, the object being to obtain a more uniform temperature, and to avoid
immediate contact of the superheater with the intense heat of the fire.
A thermometer is placed in the steam pipe to determine the temperature of the
steam immediately it leaves the superheater. A dial form of thermometer is preferred,
and is furnished with a metallic pointer, the dial being provided with metallic pins,
one placed at the point of maximum temperature and another at the point of
minimum temperature. The pointer and pins are connected with an electric battery,
and when the maximum or minimum temperature is reached the circuit is completed
and an aların bell is sounded.
CM1 1000
WALLACE FAIRWEATHER.
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
Saint Vincent Street, Glasgow, Agent for the Applicant.

page_text: 1, JAMES HERMANN ROSENTHAL, of 147, Queen Victoria Street, in the City of
London, 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 apparatus for superheating steam, either by means of
waste heat from steam generators or other furnaces, or by means of a separate
furnace for this purpose; and it also comprises means for indicating the degree of
superheat, or temperature of the superheated steam.
The invention is illustrated by the accompanying drawings, Figure 1 being a
longitudinal section of the improved superheating apparatus, Figure 2 a transverse
section on the line x-y, and Figure 3 a front elevation of the same.
The superheater consists of boxes or headers A, preferably of forged or drawn
steel and of rectangular shape connected together in pairs by means of a series of
tubes B, preferably bent to "U" shape and expanded into the boxes one limb of each
tube being connected to one box A, and the other to the adjoining box, those bent
tubes being exposed to the hot gases and serving as the main heating surface of the
superheater. Steam from the boiler enters the first box A by way of the pipe or
pipes C connecting the steam space of the boiler and said box, and is conveyed through
the "U" shaped tubes B into the second box, and thence it passes by way of the
pipe or pipes D into the steam main E. A series of boxes or tubes A, A1 and A2,
etc., as described, inay be used, some of the tubes B in the box A being connected
to the adjoining box A¹, and the remainder to the next box A2. The box A¹ is
connected in a similar manner to the box A3, and the box A2 to the box A¹. Any
number of boxes may be used, and the steam to be superheated may thus be made
to traverse any required amount of heating surface before reaching the pipes D
leading to the steam main E.
According to one arrangement the superheater is placed between the boiler, or other
furnace, and the main flue, in a separate chamber, the dampers being so arranged
that the heated gases may be turned either through the superheater chamber or
through a bye flue, or partly through both.
According to another arrangement the superheater is made to work in conjunction
with a number of boilers, and is placed in the main flue. An arrangement of
dampers and bye flue, as before described, being provided.
In the arrangement illustrated by the drawings instead of utilizing the waste heat
from the boiler F as before described, a separate furnace G is employed. The furnace
is arched over at H with refractory material, and is provided with a second
chamber I, in which the superheater consisting of the boxes A, and pipes B is
placed, the object being to obtain a more uniform temperature, and to avoid imme-
diate contact of the superheater with the intense heat of the fire.
A thermometer is placed in the steam pipe to determine the temperature of the
steam immediately it leaves the superheater. A dial form of thermometer is pre-
ferred, and is furnished with a metallic pointer, the disc being provided with metallic
pins, one placed at the point of maximum temperature and another at the point of
minimum temperature. The pointer and pins are connected with an electric battery,
and when the maximum or minimum temperature is reached the circuit is completed
and an alarm bell is sounded.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
-
1. The herein described independent steam superheating apparatus, consisting of
a series of headers or boxes of rectangular shape, preferably of forged or drawn steel,
connected by bent tubes expanded therein, and placed in a chamber in a separate
furnace constructed substantially as set forth.
2. The independent steam superheating apparatus, consisting of a series of headers
or boxes of rectangular shape, preferably of forged or drawn steel, connected by
bent tubes expanded therein, and arranged so as to utilise the waste heat from
boilers or other furnaces, after the gases have left contact with the boiler.
WALLACE FAIRWEATHER,
Of the firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62, Saint Vincent Street, Glasgow,
Agent for the Applicant.