Improvements in Steam Generators for Increasing the Efficiency and Preventing the Deposit of Incrustating Materials above the Furnace.
Year: 1889

page_text: Date of Application, 16th Sept.. 1889
Complete Specification Left, 15th Apr., 1890-Accepted, 21st June, 1890
PROVISIONAL SPECIFICATION
Improvements in Steam Generators for Increasing the Efficiency
and Preventing the Deposit of Incrustating Materials above the
Furnace.
I, JOSEPH PREGARDIEN of Deutz, Rhenish Prussia Germany Boiler Maker, do
hereby declare the nature of this invention to be as follows:-
It often happens that existing steam boilers do not supply sufficient steam on
account of the increase of the power required or because steam has to be used for
purposes not existing at first.
Now to replace the old boiler by a new and larger one does not only cause much
trouble, loss of time, stoppages of the works and expenses, but in a great many cases,
for instance in crowded towns, it is even impossible to place a larger boiler.
In order yet to increase the evaporating power of a boiler cheaply and in a very
short time without deranging the boiler in its position I have invented the arrange-
ment shown on the annexed drawing and described hereafter.
At the same time I purpose with my invention to procure such an arrangement
and such improvements by means of which I can prevent the deposition of the
incrustating materials in the more dangerous places of the boiler as in the fire box
and where the heat is greatest.
Fig. 1 shows in part a front view and in part a cross section ;
2 is a section through the flues;
"
"
3 is a longitudinal section ;
"
4 is a horizontal section of the arrangement for a Lancashire or double
flue boiler.
Practical trials have proved that the evaporation is by far the greatest in a boiler
just over the fire grate. Therefore in order to increase the evaporative power of a
steam generator it suggests it by itself that this can be done by increasing the
space occupied by the hearth and fire grate and not as is often done by placing
"economisers" and the like at the end of the flues, though these arrangements may
have their good, but as must be understood, only in such cases where heat has
been wasted in preceding stages, due to bad boiler setting and bad construction in
general.
Before the existing boiler A-(a double flued boiler is shown as illustration)-I
build and erect two small boilers B forming strictly speaking only double fire
boxes C&D. These I connect to the main boiler by flues E & F made of fire bricks
and the steam and water spaces thereof I connect with the respective spaces of the
boiler A by pipes G & H.
The water supply pipe G for the fire box boiler I arrange in such a manner in
the old boiler that its mouth G¹ reaches nearly up to the surface of the water, but
still so that under ordinary circumstances it shall always be a little deeper so that
a regular flow of water from the old boiler into the new fire box boiler shall take
place. By this means only pure water, which has already been freed from the
incrustating materials is brought into the fire box boiler, the feeding taking place
at the other end of the old boiler, and thus the plates of the fire box boiler, where
the greatest heat is produced, will always be pure and clean and they will not
corrode.
When repairs are required to be made, which as a rule are soonest needed at the

page_text: fire box, this independent fire box can be taken away without 'deranging the other
part of the boiler.
The new fire box can be set in brickwork or it can be free and coated with
non conducting material.
·mנים
1000
KARL J. MAYER,
For Joseph Pregardien.
COMPLETE SPECIFICATION.
Improvements in Steam Generators for Increasing the Efficiency
and Preventing the Deposit of Incrustating Materials above the
Furnace.
I, JOSEPH PRÉGARDIEN of Deutz, Rhenish Prussia Germany, Boiler Maker 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:
It often happens that existing steam boilers do not more supply sufficient steam
on account of the increase of the power required or steam having to be supplied
for purposes not existing at first.
Now to replace the old boiler by a new and larger one does not only cause much
trouble, loss of time, expenses and stoppages of the works, but in a great many cases,
for instance in crowded towns, it is even impossible to place a larger boiler.
In order yet to increase the evaporating power of a boiler cheaply and in a very
short time without deranging the boiler in its position I have invented the arrange-
ment shown on the annexed drawing and described hereafter.
At the same time I purpose with my invention to combine such an arrangement
and such improvements by means of which I can prevent that the incrustating
materials be deposited in the most dangerous places, i.e. in the fire box and where
the heat is greatest.
Fig. 1 shows in part a front view & in part a cross section ;
2 is a section through the flues ;
"
"
3 is a longitudinal section ;
"
4 is a horizontal section of the arrangement for a Lancashire or double
flue boiler.
Practical trials have proved that the evaporation is by far the greatest in a boiler
just over the fire grate. Therefore in order to increase the evaporative power of a
steam generator it suggests itself that this can be done by increasing the space
occupied by the hearth and the fire grate, and not as is often done by placing
"economisers" and the like at the end of the flues, though these arrangements may
have their good, but as must be understood only in such cases where heat has been
wasted in preceding stages, due to bad boiler setting or bad design in general.
Before an existing boiler A-(a double flue boiler is shown as illustration)-I
build and erect two small boilers B, forming strictly speaking double fire boxes (& D.
These I connect to the main boiler by flues E & F made of fire bricks and the
steam and water spaces thereof I connect with the respective spaces of the boiler
by pipes G & H.
The water supply pipe G for the fire box boiler I arrange in such a manner in
the old boiler that its mouth reaches nearly up to the surface of the water, but still
so, that under ordinary circumstances it shall always be a little deeper, so that a
regular flow of water from the old boiler into the new fire box boiler shall take
place. By this means only pure water which has already been freed from the
incrustating materials is brought into the fire box boiler and thus the plates of this

page_text: part of the boiler, where the greatest heat is produced, will always be pure and
clean and they will last much longer.
When repairs are required to be made, which also generally are soonest needed
at the fire box, this independent fire-box can be taken away without deranging the
other part of the boiler.
The new fire box can be set in brickwork or it can be free and coated with
non conducting material.
Having now particularly described and ascertained the nature of my Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
For increasing the evaporating power of steam boilers and for preventing
incrustating material being deposited in the hotest parts of the boiler, the arrange-
ment of a special fire box D before the main boiler being connected to the latter
by brick flues E F and having a water supply pipe G starting from near the surface
of the water in the main boiler and leading to the water space in the fire box and
a steam pipe connecting the steam space of the fire box with the steam space of the
main boiler.
Dated this Third day of April 1890.
KARL J. MAYER,
Agent for Applicant.