Improvements in Water Tube Boilers.
Year: 1896

page_text: Date of Application, 5th Mar., 1896-Accepted, 27th June, 1896
Improvements in Water Tube Boilers.
I GUSTAV LENTZ, of 18 Uhlandstrasse, Dusseldorf, in the Empire of Germany,.
Civil 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 :-
In water tube boilers as usually constructed the steam is generally very wet on
account of the small evaporating surface.
This invention has for its object to provide a water tube boiler with a large
evaporating surface for the supply of dry steam, to place the grate so that the
flame may be well developed and to arrange the water tubes so that the water
circulation is rapid and all impurities are easily blown off..
In the accompanying sheet of illustrative drawings, the boiler is shown in
Figs. 1 to 3.
It consists in the upper part of a flat upper boiler made of two bent plates a as
used in boiler ends.
The top plate carries the brass work and manhole, the bottom plate serves as
tube plate in which are secured both ends of bent spiral wound hanging tubes b.
At the lowest point of each tube is placed a mud collector c with pipe and cock to
let off mud and salt water.
The grate is placed as low as possible for getting the coal well burned.
The water tubes are either circular or flat coiled or bent in a zig-zag or
otherwise.
The flame is, by a plate d, obliged to go downwards and to circulate round the
tubes, or several plates are placed to compel the flame to go up and down
repeatedly.
The upper boiler is shown circular in plan, but might be rectangular for the
sake of enlarging the evaporating surface; it might also be elongated by inserting
a cylindrical part between the bent plates for the sake of enlarging the steam and
water contents.
This elongated cylindrical upper boiler might also be placed with its centre line
horizontal, in case the room for the boiler is long and narrow, so that one part of
it lies over the grate the other carries the water tubes. Some water tubes might.
also be placed to the sides of the grate, forming a side wall for the flame and
preventing loss of heat to the brick walls or isolating plates on the sides of the
grate.
The straight water tubes for the inlet of the water might be placed according to
the drawing outside of the plate d or inside of the coiled tubes or otherwise. The
coils might be made of one or more tubes so that they are wound in single thread
screw or double or more threaded screw.
The straight inlet tube might be made preferably of larger diameter as the
coiled one with a still wider inlet for compensating the contraction of the entering
water stream,
Each of the water tubes has a separate mud collector c with blow off pipe and
cock as shown in the drawings; or a number of these blow off pipes are connected
and have one blow off cock together..

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 water tube boiler with a flat upper boiler with large evaporating surface
and water tubes fastened in and suspended from the bottom plate of this upper
boiler.
2. The said water tubes (which are fastened with both ends into the bottom
plate of the upper boiler) circular or flat, coiled or zig-zag or otherwise bent, for
the sake of enlarging the heating surface.
3. The said hanging water tubes at the lowest point divided and provided with
a mud collector, mudhole or pipe and cock for blowing off the mud or salt water.
4. The arrangement and construction of water tube boilers, substantially as
described with reference to the drawings.
Dated this 5th day of March 1896.
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.