Improvements in Steam Generators.
Year: 1892

page_text: Date of Application, 19th May, 1892
Complete Specification Left, 20th Feb., 1893-Accepted, 25th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Steam Generators.
I EDUARD PIELOCK, Engineer, of 78 Birken Strasse, Berlin, in the Empire of
Germany, do hereby declare the nature of this invention to be as follows:-
The present invention relates to a steam generator which consists of two or more.
independent fire-boxes situated one behind the other, and of an oblong boiler adapted
to the rearmost of the said fire-boxes. Through the interior of this oblong boiler,-
in the direction of its length,-passes a water tube chamber, which is in communi-
cation, on the one hand, with the rearmost fire-box, and, on the other, with the
smoke chamber.
The fire-boxes, each of which has its own special mantle or casing, are in the
form of vertical cylinders, as are also the fire-box casings. The fire-boxes, which
consist preferably of a single tube, are closed at top by a vaulted cover, and at
bottom are in connection, by means of a "base ring," with their mantles or casings.
The steam and water spaces inside the fire-box casings are connected together by
means of short tubular pieces or joints, and the heat spaces by short tubes securely
inserted therein. Each fire-box has its special heating door, through which the
fire-boxes are alternately fed.
To the last fire-box casing is adapted the horizontal oblong boiler, in which is
situated the water tube chamber. The latter is bounded at top and bottom by flat
or level surfaces, whilst its side walls are vaulted or bulged out. The water tube
chamber is provided with upright water tubes, which are securely inserted into the
upper and lower walls of the chamber. The entire chamber is somewhat inclined
in the direction of its longitudinal axis, so that the water tubes receive a slight
inclination in opposition to the direction of the draught of the gases of combustion.
This inclination is so arranged, that the steam blasts occurring in the tubes (and-
which always take place on the side of the water tube directly played on by the
gases of combustion) can pass upwards in said tubes without being compelled to
traverse along the opposite side or wall of the tube. By this means the over-
heating of the water tubes, and the consequent bending of the same, is avoided.
The single water tube chambers may also be replaced by several small water-
tube chambers, arranged one behind the other, and in communication the one with
the other.
The gases of combustion (fire gases) are generated upon the separated grids of
the fire boxes, traverse the water tube chamber, and escape through the smoke
chamber into the chimney.
The arrangement of the fire-boxes one behind another, provides a large heating
surface, and ensures, during the change of feed of the separate grids or groups of
fire bars, an effective consumption of smoke, through the operation of the furnace
not at the time being fed.
In the water tube chamber the heating gases are better utilized than in fire-tubes,
and a more efficient production of steam will thereby be obtained.
11
L 1
M
1000
NEWTON & SON,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam Generators.
I, EDUARD PIELOCK, Engineer, of 78 Birken Strasse, Berlin in the Empire of
Germany, 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 :-
The steam generator which forms the subject of the present invention is character-
ised, on the one hand, by two fire boxes situated one behind the other, (by which
arrangement, besides the acquisition of a large direct heating surface, with alternate
feeding of the divided grates, a consumption of smoke will be effected by means of
the furnace not then being fed), and, on the other hand, by a water tube chamber,
which, filled with water tubes between which the fire gases are allowed to pass,
renders possible a better and more complete utilization of these gases.
As an example of the arrangement of the above indicated parts, a locomotive
boiler is represented in the accompanying sheet of drawings, wherein
Fig. 1 is a vertical longitudinal section, Fig. 2 a horizontal section, and Fig. 3
(see Fig. 1) a vertical cross section through the water tube chamber.
As shewn in the figures, the two fire boxes a and b (arranged one behind the
other), and also the two fire box jackets c and d, are of cylindrical form, and are
each closed at top by a dome shaped cover a¹ and b, c and d', respectively. Both
fire boxes a b, which are each formed of corrugated tubes, are connected at their
lower ends by means of a base ring, e or f, with their respective jackets c or d.
The steam or water spaces of the two vertical boilers formed by the fire boxes
and firebox jackets, are brought into connection by means of the short tubes r,
whilst the fire or heat spaces are connected by means of the "flame tubes" + firmly
fixed therein.
The long cylindrical vessel or boiler g is connected with the second of the two
vertical boilers 6 d, and contains the water tube chamber h. The latter consists of
a tube bevelled off at top and bottom, and containing a number of water tubes i,
which are securely fitted in the upper and under sides of the chamber. The water
tube chamber h is connected, on the one side, with the second fire box b, and on the
other, with the smoke chamber k of the boiler g.
The water tube chamber, and with it the water tubes, are slightly inclined from
the horizontal, to correspond with the direction of the course of the fire gases. The
inclination is so arranged that the steam blasts occurring in the tubes (and which
always take place on the side of the water tube directly played on by the gases of
combustion) can pass upwards in said tubes without being compelled to traverse
along the opposite side or wall of the tube. By this means an excessive heating of
this opposite side or wall of the tube, and thereby a bending or warping of the tubes,
is prevented.
For the purpose of cleaning or repair, the water tube chamber can be taken out
and removed, by loosening the connection of the same with the second fire box.
In the boiler itself, unlike those of usual construction, stay bolts (stays) and
angle irons are not required.
The gases of combustion, developed upon two separate grates, pass along through
the water tube chamber h, and escape through the smoke chamber into the
chimney.
The two fireboxes give a relatively large, direct heating surface, whilst in the
water tube chamber, the gases of combustion, not liable to frequent changes of
direction, can be better utilized than with the ordinary fire tubes.
Under certain circumstances, it may be advantageous to employ more than two
fire boxes placed one behind the other.

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. A steam boiler, in which two or more separate and complete firebox jackets c, d
(with fireboxes a, b contained therein) are arranged one behind the other, and in
which the firebox jackets, as well as the fireboxes, are placed in communication by
means of one or more tubes rr, so that, with alternate feeding of the separate fire-
boxes, a perfect combustion of smoke is attained.
2. A steam boiler of the kind referred to in Claim 1, in which a water-tube
chamber is connected to the adjoining firebox, such water tube chamber being
somewhat inclined in the direction of its longitudinal axis, so that the water
tubes have a slight opposite inclination to the course of the gases of combustion.
Dated this 20th day of February 1893.
NEWTON & SON,
Agents for the Applicant.