Provided are dynamic sealing structure and rotary kiln apparatus. Dynamic sealing structure includes kiln tail, discharging cover, sealing mechanism, guiding mechanism and a balancing device. Discharging cover includes discharging cover cylinder and discharging cover end face connected to same, discharging cover cylinder is arranged on outer side of circumferential wall of kiln tail in a sleeving manner, and discharging cover end face and end face of the kiln tail are arranged at intervals. Sealing mechanism is arranged between discharging cover cylinder and kiln tail and is connected to inner wall of discharging cover cylinder. Guiding mechanism is arranged between inner wall of discharging cover cylinder and outer side of kiln tail, and is located on one side or two sides of the sealing mechanism in axial direction of rotary kiln, rotating gap is provided between guiding mechanism and kiln tail, and balancing device is connected to outer side of the discharging cover cylinder.

Method of operating a long direct-fired inclined counterflow rotary kiln for the thermal treatment of material and counterflow rotary kiln adapted for same, whereby material to be treated is introduced into the kiln at the inlet end and treated material is evacuated from the kiln at the outlet end, whereby a main combustion zone extends inside the kiln over a distance of ¼ to ⅓ of the internal length L.sub.int of the kiln, whereby a supplementary combustion zone in which supplementary combustion takes place with an oxygen-rich oxidant extends inside the kiln over a distance from the inlet end of at most ¼ of the internal length L.sub.int, and whereby no combustion takes place in a heat exchange zone located between the main combustion zone and the supplementary combustion zone.

Method of operating a long direct-fired inclined counterflow rotary kiln for the thermal treatment of material and counterflow rotary kiln adapted for same, whereby material to be treated is introduced into the kiln at the inlet end and treated material is evacuated from the kiln at the outlet end, whereby a main combustion zone extends inside the kiln over a distance of ¼ to ⅓ of the internal length L.sub.int of the kiln, whereby a supplementary combustion zone in which supplementary combustion takes place with an oxygen-rich oxidant extends inside the kiln over a distance from the inlet end of at most ¼ of the internal length L.sub.int, and whereby no combustion takes place in a heat exchange zone located between the main combustion zone and the supplementary combustion zone.

The present invention relates to a method and apparatus for producing reduced iron from ironmaking dust which contains iron oxide which is generated at an ironmaking plant, takes note of the rotary kiln reduction method which does not require pretreatment of the dust, and has as its problem the pursuit of facilities which achieve further improvement of heat efficiency and stable operation.

To solve this problem, the present invention is characterized by heating and reducing carbon-containing shaped materials in a single closed space in which an internal heat type rotary kiln and an external heat type rotary kiln are arranged in series and including at least the insides of the two rotary kilns during which making the reduced exhaust gas which is generated at the external heat type rotary kiln burn inside of the internal heat type rotary kiln.

A horizontal pyrolysis furnace has a kiln and two barrels. The two barrels are respectively a processing barrel rotatably disposed in the kiln and a takeover barrel detachably connected with the processing barrel. Each one of the two barrels has a gate assembly and at least one spiral guiding plate. The gate assembly of the processing barrel is mounted on an end of the processing barrel, and extends out from the kiln. The two gate assemblies of the two barrels are detachably connected such that the two barrels are able to rotate synchronously. The at least one spiral guiding plate is fixed on an inner surface of one of the two barrels, and the spiral guiding plates of both barrels have an identical helical direction.

A horizontal pyrolysis furnace has a kiln and two barrels. The two barrels are respectively a processing barrel rotatably disposed in the kiln and a takeover barrel detachably connected with the processing barrel. Each one of the two barrels has a gate assembly and at least one spiral guiding plate. The gate assembly of the processing barrel is mounted on an end of the processing barrel, and extends out from the kiln. The two gate assemblies of the two barrels are detachably connected such that the two barrels are able to rotate synchronously. The at least one spiral guiding plate is fixed on an inner surface of one of the two barrels, and the spiral guiding plates of both barrels have an identical helical direction.

A pyrolysis furnace having a heating chamber which surrounds a cylindrical pyrolysis chamber. The heating chamber is assembled from an upper part and a lower part, which can be joined. Each part of the heating chamber is provided with two rows of heating elements, which are arranged along the length of the housing of the heating chamber symmetrically relative to a vertical plane passing through the axis of the pyrolysis chamber. The heating elements are in the form of units, containing at least one flameless gas burner. The heating elements in the upper part of the heating chamber are arranged in a checkerboard fashion relative to the heating elements in the lower part. The furnace relates to power generation and the environment and is intended for the thermal processing of solid and free-flowing materials, particularly in processes for the pyrolysis of solid carbon-containing materials, including municipal and domestic waste.

A pyrolysis furnace having a heating chamber which surrounds a cylindrical pyrolysis chamber. The heating chamber is assembled from an upper part and a lower part, which can be joined. Each part of the heating chamber is provided with two rows of heating elements, which are arranged along the length of the housing of the heating chamber symmetrically relative to a vertical plane passing through the axis of the pyrolysis chamber. The heating elements are in the form of units, containing at least one flameless gas burner. The heating elements in the upper part of the heating chamber are arranged in a checkerboard fashion relative to the heating elements in the lower part. The furnace relates to power generation and the environment and is intended for the thermal processing of solid and free-flowing materials, particularly in processes for the pyrolysis of solid carbon-containing materials, including municipal and domestic waste.

A horizontal pyrolysis furnace has a kiln and two barrels. The two barrels are respectively a processing barrel rotatably disposed in the kiln and a takeover barrel detachably connected with the processing barrel. Each one of the two barrels has a gate assembly and at least one spiral guiding plate. The gate assembly of the processing barrel is mounted on an end of the processing barrel, and extends out from the kiln. The two gate assemblies of the two barrels are detachably connected such that the two barrels are able to rotate synchronously. The at least one spiral guiding plate is fixed on an inner surface of one of the two barrels, and the spiral guiding plates of both barrels have an identical helical direction.

A horizontal pyrolysis furnace has a kiln and two barrels. The two barrels are respectively a processing barrel rotatably disposed in the kiln and a takeover barrel detachably connected with the processing barrel. Each one of the two barrels has a gate assembly and at least one spiral guiding plate. The gate assembly of the processing barrel is mounted on an end of the processing barrel, and extends out from the kiln. The two gate assemblies of the two barrels are detachably connected such that the two barrels are able to rotate synchronously. The at least one spiral guiding plate is fixed on an inner surface of one of the two barrels, and the spiral guiding plates of both barrels have an identical helical direction.