IMPROVEMENTS CONNECTED WITH THE 'HYDRAULIC MAIN' USED IN THE DISTILLATION OF GAS
Year: 1880

page_text: LETTERS PATENT to Gerard Wenzeslaus von Nawrocki, of the Firm of
J. Brandt and G. W. v. Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany,
Patent Agent, for an Invention of "IMPROVEMENTS CONNECTED WITH THE
'HYDRAULIC MAIN' USED IN THE DISTILLATION OF GAS." A communication
from Johannes Foerster, of Koenigsberg, Prussia, Manager of Gas Works.
COMPLETE SPECIFICATION filed by the said Gerard Wenzeslaus von
Nawrocki at the Office of the Commissioners of Patents on the 28th July
1880.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W.
v. Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany, Patent Agent. "IMPROVE-
MENTS CONNECTED WITH THE HYDRAULIC MAIN USED IN THE DISTILLATION
OF GAS." A communication from Johannes Foerster, of Koenigsberg, Prussia,
Manager of Gas Works.
The tar combinations or tarry products in the bydraulic main occasionally
produce a clogging up of the rising dip pipes during the manufacture of gas from
coal or other carbonaceous products. This clogging up, which now especially by
the working at higher temperatures in the retort furnace becoines more general,
leads to the most troublesome interruptions in the working. The cause of this is
that the gas has to be evolved in the retort under a pressure produced by the
aforesaid partial closing up of the dip pipe. This pressure does not remain constant,
but increases with the density of the closing up tar. A decomposition of the gas
or a formation of solid bodies therefrom consequently takes place in the retort, and
this also influences the composition of the tarry gases.
This decomposition process would be avoided if the pressure is taken off by
removal of the closure during manufacture, and only established when the retorts
are opened.
The object of this Invention is to do away with the evils referred to above, and
in the manner just above indicated. For this purpose the hydraulic main and parts
connected therewith are constructed and arranged as will be best understood by
reference to the accompanying Drawings.

page_text: Figure 1 is a vertical longitudinal section of part of the hydraulic main and of
the dip pipe, and Figure 2 is a vertical cross section of same.
a is a hollow cone or ring, which during the distillation assumes its lowest
position under the tar level in the hydraulic main A. It is suspended to the lower
end of the rod b, which passes out through a stuffing box in the lid of the rising
gas pipe d, and is connected to an outer lever c and rod e, by means of which the
hollow cone a may be raised from the retort firing room into the position shown in
dotted lines in Figure 2, and brought into connection with the gas pipe & before
the retorts are opened.
The outside of the cone ring a will then rest against the inside of the pipe d, and
form therewith a ring of V section; the tar on the ring a and the tar flowing down
the pipe d will make a joint between a and d. In this position the cone ring a
reestablishes the former usual lute or closure.
This Invention is applicable wherever a hydraulic closure or lute of the dip pipe
with the hydraulic main-is used, hence also in the distillation of other solid or
liquid carbonaceous substances or hydrocarbons other than coal.
And having thus described and ascertained the nature of this Invention
communicated to me, I declare that I claim,-
The application of an apparatus for taking off the pressure on the interior of
retorts used for the distillation of coal and other carbonaceous materials in solid or
liquid form, and consisting mainly of a hollow cone a, which during the distillation
serves to prevent the hydraulic closure of the dip pipe d in the hydraulic main, but
serves to establish it again during the charging of the retorts, substantially as set
forth.
In witness whereof, I, the said Gerard Wenzeslaus von Nawrocki, have
hereunto set my hand and seal, this Twenty sixth day of July, in the year
of our Lord One thousand eight hundred and eighty.
GERARD WENZESLAUS VON NAWROCKI. (L.S.)