Abstract: A raw-material heating apparatus in which raw-material supplying pipes and exhaust pipes are disposed in a peripheral portion of a furnace cover, a heating space is formed by the furnace cover, a peripheral wall, and a hearth, a raw material which is supplied from the raw-material supplying pipes and deposited on the hearth is heated by a heating gas which flows into the heating space, and pushers are supported by the peripheral wall for pushing out the raw material on the hearth toward a drop port formed in a central portion of the hearth, the deposited raw material on the hearth being caused to drop consecutively through the drop port by the reciprocating motion of the pushers, characterized in that lower-end openings of each raw-material supplying pipe and each exhaust pipe, when viewed in an axial direction of the apparatus, are disposed at a same position or at positions close to each other in an effective region for pushing out the raw material by the pusher.

Abstract: An apparatus for pushing in a predetermined quantity solid pulverized and/or lumpy objects forming a deposited layer to a discharge section includes: a plurality of pusher members disposed in parallel with each other; and a driving device to which the plurality of pusher members are connected so as to push the pulverized and/or lumpy objects to the discharge section as the plurality of pusher members are reciprocated by the driving device in a longitudinal direction of each of the plurality of pusher members, the driving device having a first axially supporting portion and a second axially supporting portion which are arranged at two positions in the longitudinal direction such that the driving device is angularly displaceable about an axis of the first axially supporting portion and an axis of the second axially supporting portion, the axis of the first axially supporting portion and the axis of the second axially supporting portion being in a perpendicular relationship to each other when projected on a plan

Abstract: A storage device 23 for storing a raw material to be calcined is provided at a position above a kiln cover 1, and the storage device 23 is connected to a preheating space 22 in such a manner as to be capable of dropwise supplying the raw material into the preheating space 22 by means of a raw-material supplying pipe 26. An airtight supplying mechanism 24 for dropwise supplying the raw material in a state in which the influx of air from the outside is prevented is provided between the storage device 23 and the raw-material supplying pipe 26.

Abstract: A rotary kiln includes a cylindrical kiln body supported for rotation about a central axis inclined with respect to a horizontal plane, a cylindrical combustion chamber formed inside the kiln body and extending along the central axis, and a plurality of cylindrical calcination chambers formed inside the kiln body so as to lie parallel with and surround the combustion chamber. The combustion chamber has an outlet at its lower end from which residue produced by combustion of fuel inside the combustion chamber drops for further combustion and/or discharge.

Abstract: In a top-shaped lime kiln which comprises a slowly rotatable platter-shaped kiln bed having a cylindrical calcined lime-cooling chamber extending downward for connection to the central opening of said kiln bed; an immovably hung round lid having a fuel combustion chamber extending upward for connection to the central opening of said lid; and raw limestone granules-feeding chutes 19 opened to an annular gap 12 formed between the peripheral walls of both bed and lid; an improvement wherein a hot-gas-circulating apparatus is fixed in the maturation zone of the cooling chamber, and automatically reciprocative pushing rods are inserted into the limestone granule layer formed on the rotary kiln bed through the peripheral wall of said bed or lid so as to let fall the calcined lime into the cooling chamber.