IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES
Year: 1867

page_text: PROVISIONAL SPECIFICATION left by Jacob Eichhorn at the Office of
the Commissioners of Patents; with his Petition, on the 10th September
1867 A communication from abroad by Heinrich Krigar and Wilhelm
Grote, residing in Hanover, in the Kingdom of Prussia,
I, JACOB EICHHORN, of 7, Delahay. Street, Westminster, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN STEAM BOILER AND
OTHER FURNACES," to be as follows:-
This Invention has for its object improvements in steam boiler and other
furnaces. In constructing a furnace suitable for a steam boiler a chamber is
formed which is enclosed at the sides by the side walls of the boiler setting
at the top by an arch spanning the interval between the walls, and at the back
the chamber is partly enclosed by a wall supported by another lower arch.
At a short distance from and below the crown of this arch is the lower end of
an inclined grid of fire-bars forming a partition in the chamber. The bottom
of the chamber may be a cast-iron plate supported on the side walls, and the
front is enclosed by doors. There is one door over the fire-bars for the intro-
duction of fuel into the chamber, and another door opening into the space
below the fire-bars, by means of which the air draft through the bars may be
regulated. The back of the chamber is open below the arch which supports
the back wall, and the fuel descends out of it on to another or third arch or

page_text: platform immediately beneath that just mentioned and which forms a
continuation of the bottom of the chamber. The fuel on this arch or platform
is from time to time pushed back by the stoker so as to cause it to fall over
the back of the arch or platform on to fire-bars beneath, on which a fire is
thus maintained; it is supplied with air from an ash-pit below the bars, which
has a regulating door, and there is also a fire-door above the level of these
fire-bars to admit of the workman clearing the fire from time to time. The
furnace is so regulated that a slow combustion is maintained in the fuel
chamber whilst a bright and rapidly burning fire is kept up on the bars
below, and over this fire the smoke and products distilling from the fuel in
the chamber have to pass, and so are effectually burnt. If the steam boiler be
cylindrical with an internal fluè it may be set with its front end resting on
the arch which also supports the back wall of the fuel chamber. The heated
draft from the fire passes along under the boiler and then returns by the
internal flue to the front, until immediately behind the back wall of the
chamber it passes laterally to two flues which lead it along the sides of the
boiler to the chimney. Air passages may be built in the brickwork to supply
air where it may be required, more especially to mix with the gases passing
from the fuel chamber as they are submitted to the heat of the fire on the
bars below to ensure their perfect combustion. The furnaces of other steam
boilers may also be similarly arranged, and the same system is applicable to
reverberatory and other furnaces, kilns, and ovens.
The method of constructing the furnace may be varied so long as its general
arrangement be retained.