IMPROVEMENTS IN FURNACES FOR STEAM BOILERS AND OTHER HEATING PURPOSES
Year: 1883

page_text: "
LETTERS PATENT to Friedrich Carl Glaser of Berlin in the Empire of
Germany, Engineer and Patent Agent for an Invention of "IMPROVEMENTS
IN FURNACES FOR STEAM BOILERS AND OTHER HEATING PURPOSES A
communication to him by Carl Albrecht Petzold a person residing at Berlin
in the Empire of Germany
COMPLETE SPECIFICATION filed by the said Friedrich Carl Glaser at the
Office of the Commissioners of Patents on the 2nd May 1883.
FRIEDRICH CARL GLASER of Berlin in the Empire of Germany, Engineer and
Patent Agent "IMPROVEMENTS IN FURNACES FOR STEAM BOILERS AND OTHER
HEATING PURPOSES a communication to me by Carl Albrecht Petzold a person
residing at Berlin in the Empire of Germany.
"
This invention relates to an improved construction of furnaces for steam boilers
and other heating purposes wherein the consumption of smoke is effected by
Causing heated air to enter firstly in divided streams above the firegrate, so as to
mix intimately and enter into combustion with the smoke immediately above the
fire, and also to enter in divided streams at the fire bridge so as to enter there into
combustion with any escaping gases and smoke that may not have been consumed
over the fire
The improved construction of furnace is shewn on the accompanying drawing,
in which Fig. 1 shews a transverse section at the firebridge, Fig. 2 a sectional plan.
Fig. 3 a longitudinal section and Fig. 4 a transverse section at the firegrate. Ia
the middle of the firegrate Fig. 2 is a cast iron hollow partition, which serves to
support the double arched firebrick top of the furnace. The partition has openings
in front provided with regulating valves. The upper part thereof serves for the
supply of air through the inner sides of the furnace above the fireplace, the other
sides of the furnace being formed of firebrick. Above the arched top and behind
the outer sides are formed other air passages having openings in front provided
with regulating valves, while the arches and sides of the furnace are pierced with
holes through which the heated air finds its way from these passages into the space
D

page_text: above the firegrate. The lower part of the middle partition serves for leading the
air to the hollow cast steel rings a a at the firebridge, which rings have two chambers
of which the smaller front ones have cold water circulating through them, in order
to protect the rings from injury by the heat, while the larger chambers have
perforations in their upper part through which the heated air issues in jets among
the gases escaping through the rings. The water spaces have at top a partition e e
the water supply being effected through the pipe and branches g g from a
raised reservoir on one side of the partition, while the water after passing round
the ring, escapes through the pipes hh on the other side of the partition into a
tank, from which it may be taken to supply the boiler.
At Figs. 5 and 6 are shewn respectively a transverse section and longitudinal
section of a modification in which the cast steel rings are replaced by fire clay
rings ii, having in their upper part perforations for the entrance of air from the
space surrounding them, into which the air is conducted through a passage leading
from the front of the furnace, where it is provided with regulating valves. In
order to insure the perfect admixture of the heated air with the gases passing
through the tubes i, these have helically formed division walls K, making half a
turn in the length of the tube, so as to be vertical at both ends thereof, and thereby
forcing the gases both to exercise a pressure and to have a helical motion in the
tubes whereby their mixture with the entering air is effectually accomplished.
Having thus described the nature of the said invention and in what manner the
same is to be performed as communicated to me by my correspondent, I claim :
First. The improved construction of furnaces for the combustion of smoke, wherein
heated air is caused to enter in divided jets through hollow perforated cast
steel rings at the firebridge, which are cooled by water circulation, sub-
stantially as herein described with reference to Figs. 1 to 4 of the drawings
Second. The improved construction of furnaces for the combustion of smoke
wherein heated air is caused to enter in divided jets through perforated fire-
brick tubes at the firebridge, having internal helical division walls, sub-
stantially as herein described with reference to Figs. 5 and 6 of the
drawings.
In Witness whereof I the said Friedrich Carl Glaser have hereunto set my
hand and seal this thirtieth day of April in the year of our Lord One
thousand eight hundred and eighty three.
TRIEDRICH
CAPT CLASTD