A New or Improved Continuous Lime and Cement Kiln or Furnace.
Year: 1889

page_text: Date of Application, 14th May, 1889-Accepted, 15th June, 18'9
COMPLETE SPECIFICATION.
A New or Improved Continuous Lime and Cement Kiln or Furnace.
1 AUGUST SCHOFER, Manager of the Breitenburger Portland Cement Works at
Lägerdorf near Jtzehoe in the Kingdom of Prussia 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 object of this invention is to construct an improved shaft furnace or kiln for
lime and cement to work continuously. The improved furnace is illustrated in the
drawings hereunto annexed in which Fig. 1 is à vertical central section of the said
furnace or kiln. Fig. 2 being a cross section looking upward upon line 2. and
Fig. 3 a cross section in plan on line y y of Fig. 1. The construction of the furnace
will be understood from Fig. 1 and the remainder of the drawings with the descrip-
tion following.
D is the body of the furnace, S the shaft, A is an opening in the side of the shaft S
of the furnace this opening should have means for closing it and serves for filling
the furnace at starting and for feeding the material thereto afterwards. For starting
the furnace it is filled from the grating R up to the opening A with alternate layers
of chalk or cement stone and fuel in the same manner as an ordinary lime or cement
kiln.
I provide for the continuous working of the furnace by a peculiar construction
thereof as follows the lower part or body of the furnace D is comparatively broad
and is domed at the top as shown the shaft joining the dome being considerably
narrower than the part D. In filling the furnace through the inlet A the materials
will spread over the whole surface in the lower part of D but when the materials have
reached such a height that the naturally conical heap made by them in falling
touches the lower edge of the shaft S, they will continue to fill said shaft S while
leaving a free and unoccupied annular space m under the dome of the body D of
the furnace which will not become filled during the stirring about or drawing off
of the charge nor during the continuous feeding of the furnace but will always exist
in a more or less regular shape. The opening A being for feeding the chalk or cement
stones the space m is that to which the fuel is to be supplied during the continuous
working, this being attained by providing the wall of the furnace with the openings
or chutes leading down into the said space m.
i
As soon as the originally charged
furnace is in full work and the charge appears red or white hot in the space m the
fuel can be added through the chutes which are arranged at intervals around the
base of the shaft S some almost perpendicular and others obliquely so that the fuel
may be added to the space m where it may be judged to be most required.
For fuel broken coke or coal may be used as well as
"slack."
The chief combustion takes place from about half the height of the space m upward
to within the shaft. The preliminary heating of the charge takes place in the
shaft.
Side opening with closing doors may be arranged to permit the removal of
clinkers etc., which may become burnt on the side of the furnace.
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. The construction of lime or cement kiln or furnace with the body D and shaft S
whereby a space m is left by the charge substantially as and for the purpose set
forth.

page_text: 2. The construction of lime or cement kiln or furnace with the domed body D
and shaft S with side opening A in said shaft and chutes i i leading into said dome
substantially as and for the purpose set forth.
Dated this 11th day of Mov 1889
HERBERT & Co,
18, Buckingham Street, Strand, W., Agents to Applicant.